1 /*
2 * Copyright (c) 1997, 2019, 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 "classfile/classLoaderDataGraph.hpp"
27 #include "classfile/metadataOnStackMark.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "code/codeCache.hpp"
30 #include "code/debugInfoRec.hpp"
31 #include "gc/shared/collectedHeap.inline.hpp"
32 #include "interpreter/bytecodeStream.hpp"
33 #include "interpreter/bytecodeTracer.hpp"
34 #include "interpreter/bytecodes.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "interpreter/oopMapCache.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/heapInspection.hpp"
39 #include "memory/metadataFactory.hpp"
40 #include "memory/metaspaceClosure.hpp"
41 #include "memory/metaspaceShared.hpp"
42 #include "memory/oopFactory.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "oops/constMethod.hpp"
45 #include "oops/constantPool.hpp"
46 #include "oops/method.inline.hpp"
47 #include "oops/methodData.hpp"
48 #include "oops/objArrayOop.inline.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "oops/symbol.hpp"
51 #include "oops/valueKlass.hpp"
52 #include "prims/jvmtiExport.hpp"
53 #include "prims/methodHandles.hpp"
54 #include "prims/nativeLookup.hpp"
55 #include "runtime/arguments.hpp"
56 #include "runtime/compilationPolicy.hpp"
57 #include "runtime/frame.inline.hpp"
58 #include "runtime/handles.inline.hpp"
59 #include "runtime/init.hpp"
60 #include "runtime/orderAccess.hpp"
61 #include "runtime/relocator.hpp"
62 #include "runtime/safepointVerifiers.hpp"
63 #include "runtime/sharedRuntime.hpp"
64 #include "runtime/signature.hpp"
65 #include "utilities/align.hpp"
66 #include "utilities/quickSort.hpp"
67 #include "utilities/vmError.hpp"
68 #include "utilities/xmlstream.hpp"
69
70 // Implementation of Method
71
72 Method* Method::allocate(ClassLoaderData* loader_data,
73 int byte_code_size,
74 AccessFlags access_flags,
75 InlineTableSizes* sizes,
76 ConstMethod::MethodType method_type,
77 TRAPS) {
78 assert(!access_flags.is_native() || byte_code_size == 0,
79 "native methods should not contain byte codes");
80 ConstMethod* cm = ConstMethod::allocate(loader_data,
81 byte_code_size,
82 sizes,
83 method_type,
84 CHECK_NULL);
85 int size = Method::size(access_flags.is_native());
86 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags);
87 }
88
89 Method::Method(ConstMethod* xconst, AccessFlags access_flags) {
90 NoSafepointVerifier no_safepoint;
91 set_constMethod(xconst);
92 set_access_flags(access_flags);
93 set_intrinsic_id(vmIntrinsics::_none);
94 set_force_inline(false);
95 set_hidden(false);
96 set_dont_inline(false);
97 set_has_injected_profile(false);
98 set_method_data(NULL);
99 clear_method_counters();
100 set_vtable_index(Method::garbage_vtable_index);
101
102 // Fix and bury in Method*
103 set_interpreter_entry(NULL); // sets i2i entry and from_int
104 set_adapter_entry(NULL);
105 clear_code(false /* don't need a lock */); // from_c/from_i get set to c2i/i2i
106
107 if (access_flags.is_native()) {
108 clear_native_function();
109 set_signature_handler(NULL);
110 }
111 NOT_PRODUCT(set_compiled_invocation_count(0);)
112 }
113
114 // Release Method*. The nmethod will be gone when we get here because
115 // we've walked the code cache.
116 void Method::deallocate_contents(ClassLoaderData* loader_data) {
117 MetadataFactory::free_metadata(loader_data, constMethod());
118 set_constMethod(NULL);
119 MetadataFactory::free_metadata(loader_data, method_data());
120 set_method_data(NULL);
121 MetadataFactory::free_metadata(loader_data, method_counters());
122 clear_method_counters();
123 // The nmethod will be gone when we get here.
124 if (code() != NULL) _code = NULL;
125 }
126
127 address Method::get_i2c_entry() {
128 assert(adapter() != NULL, "must have");
129 return adapter()->get_i2c_entry();
130 }
131
132 address Method::get_c2i_entry() {
133 assert(adapter() != NULL, "must have");
134 return adapter()->get_c2i_entry();
135 }
136
137 address Method::get_c2i_value_entry() {
138 assert(adapter() != NULL, "must have");
139 return adapter()->get_c2i_value_entry();
140 }
141
142 address Method::get_c2i_unverified_entry() {
143 assert(adapter() != NULL, "must have");
144 return adapter()->get_c2i_unverified_entry();
145 }
146
147 char* Method::name_and_sig_as_C_string() const {
148 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
149 }
150
151 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
152 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
153 }
154
155 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
156 const char* klass_name = klass->external_name();
157 int klass_name_len = (int)strlen(klass_name);
158 int method_name_len = method_name->utf8_length();
159 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
160 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
161 strcpy(dest, klass_name);
162 dest[klass_name_len] = '.';
163 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
164 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
165 dest[len] = 0;
166 return dest;
167 }
168
169 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
170 Symbol* klass_name = klass->name();
171 klass_name->as_klass_external_name(buf, size);
172 int len = (int)strlen(buf);
173
174 if (len < size - 1) {
175 buf[len++] = '.';
176
177 method_name->as_C_string(&(buf[len]), size - len);
178 len = (int)strlen(buf);
179
180 signature->as_C_string(&(buf[len]), size - len);
181 }
182
183 return buf;
184 }
185
186 const char* Method::external_name() const {
187 return external_name(constants()->pool_holder(), name(), signature());
188 }
189
190 void Method::print_external_name(outputStream *os) const {
191 print_external_name(os, constants()->pool_holder(), name(), signature());
192 }
193
194 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
195 stringStream ss;
196 print_external_name(&ss, klass, method_name, signature);
197 return ss.as_string();
198 }
199
200 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
201 signature->print_as_signature_external_return_type(os);
202 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
203 signature->print_as_signature_external_parameters(os);
204 os->print(")");
205 }
206
207 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
208 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
209 // access exception table
210 ExceptionTable table(mh());
211 int length = table.length();
212 // iterate through all entries sequentially
213 constantPoolHandle pool(THREAD, mh->constants());
214 for (int i = 0; i < length; i ++) {
215 //reacquire the table in case a GC happened
216 ExceptionTable table(mh());
217 int beg_bci = table.start_pc(i);
218 int end_bci = table.end_pc(i);
219 assert(beg_bci <= end_bci, "inconsistent exception table");
220 if (beg_bci <= throw_bci && throw_bci < end_bci) {
221 // exception handler bci range covers throw_bci => investigate further
222 int handler_bci = table.handler_pc(i);
223 int klass_index = table.catch_type_index(i);
224 if (klass_index == 0) {
225 return handler_bci;
226 } else if (ex_klass == NULL) {
227 return handler_bci;
228 } else {
229 // we know the exception class => get the constraint class
230 // this may require loading of the constraint class; if verification
231 // fails or some other exception occurs, return handler_bci
232 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
233 assert(k != NULL, "klass not loaded");
234 if (ex_klass->is_subtype_of(k)) {
235 return handler_bci;
236 }
237 }
238 }
239 }
240
241 return -1;
242 }
243
244 void Method::mask_for(int bci, InterpreterOopMap* mask) {
245 methodHandle h_this(Thread::current(), this);
246 // Only GC uses the OopMapCache during thread stack root scanning
247 // any other uses generate an oopmap but do not save it in the cache.
248 if (Universe::heap()->is_gc_active()) {
249 method_holder()->mask_for(h_this, bci, mask);
250 } else {
251 OopMapCache::compute_one_oop_map(h_this, bci, mask);
252 }
253 return;
254 }
255
256
257 int Method::bci_from(address bcp) const {
258 if (is_native() && bcp == 0) {
259 return 0;
260 }
261 #ifdef ASSERT
262 {
263 ResourceMark rm;
264 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(),
265 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s",
266 p2i(bcp), name_and_sig_as_C_string());
267 }
268 #endif
269 return bcp - code_base();
270 }
271
272
273 int Method::validate_bci(int bci) const {
274 return (bci == 0 || bci < code_size()) ? bci : -1;
275 }
276
277 // Return bci if it appears to be a valid bcp
278 // Return -1 otherwise.
279 // Used by profiling code, when invalid data is a possibility.
280 // The caller is responsible for validating the Method* itself.
281 int Method::validate_bci_from_bcp(address bcp) const {
282 // keep bci as -1 if not a valid bci
283 int bci = -1;
284 if (bcp == 0 || bcp == code_base()) {
285 // code_size() may return 0 and we allow 0 here
286 // the method may be native
287 bci = 0;
288 } else if (contains(bcp)) {
289 bci = bcp - code_base();
290 }
291 // Assert that if we have dodged any asserts, bci is negative.
292 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
293 return bci;
294 }
295
296 address Method::bcp_from(int bci) const {
297 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
298 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
299 address bcp = code_base() + bci;
300 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
301 return bcp;
302 }
303
304 address Method::bcp_from(address bcp) const {
305 if (is_native() && bcp == NULL) {
306 return code_base();
307 } else {
308 return bcp;
309 }
310 }
311
312 int Method::size(bool is_native) {
313 // If native, then include pointers for native_function and signature_handler
314 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
315 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
316 return align_metadata_size(header_size() + extra_words);
317 }
318
319
320 Symbol* Method::klass_name() const {
321 return method_holder()->name();
322 }
323
324
325 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
326 log_trace(cds)("Iter(Method): %p", this);
327
328 it->push(&_constMethod);
329 it->push(&_method_data);
330 it->push(&_method_counters);
331 }
332
333 // Attempt to return method oop to original state. Clear any pointers
334 // (to objects outside the shared spaces). We won't be able to predict
335 // where they should point in a new JVM. Further initialize some
336 // entries now in order allow them to be write protected later.
337
338 void Method::remove_unshareable_info() {
339 unlink_method();
340 }
341
342 void Method::set_vtable_index(int index) {
343 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
344 // At runtime initialize_vtable is rerun as part of link_class_impl()
345 // for a shared class loaded by the non-boot loader to obtain the loader
346 // constraints based on the runtime classloaders' context.
347 return; // don't write into the shared class
348 } else {
349 _vtable_index = index;
350 }
351 }
352
353 void Method::set_itable_index(int index) {
354 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
355 // At runtime initialize_itable is rerun as part of link_class_impl()
356 // for a shared class loaded by the non-boot loader to obtain the loader
357 // constraints based on the runtime classloaders' context. The dumptime
358 // itable index should be the same as the runtime index.
359 assert(_vtable_index == itable_index_max - index,
360 "archived itable index is different from runtime index");
361 return; // don’t write into the shared class
362 } else {
363 _vtable_index = itable_index_max - index;
364 }
365 assert(valid_itable_index(), "");
366 }
367
368
369
370 bool Method::was_executed_more_than(int n) {
371 // Invocation counter is reset when the Method* is compiled.
372 // If the method has compiled code we therefore assume it has
373 // be excuted more than n times.
374 if (is_accessor() || is_empty_method() || (code() != NULL)) {
375 // interpreter doesn't bump invocation counter of trivial methods
376 // compiler does not bump invocation counter of compiled methods
377 return true;
378 }
379 else if ((method_counters() != NULL &&
380 method_counters()->invocation_counter()->carry()) ||
381 (method_data() != NULL &&
382 method_data()->invocation_counter()->carry())) {
383 // The carry bit is set when the counter overflows and causes
384 // a compilation to occur. We don't know how many times
385 // the counter has been reset, so we simply assume it has
386 // been executed more than n times.
387 return true;
388 } else {
389 return invocation_count() > n;
390 }
391 }
392
393 void Method::print_invocation_count() {
394 if (is_static()) tty->print("static ");
395 if (is_final()) tty->print("final ");
396 if (is_synchronized()) tty->print("synchronized ");
397 if (is_native()) tty->print("native ");
398 tty->print("%s::", method_holder()->external_name());
399 name()->print_symbol_on(tty);
400 signature()->print_symbol_on(tty);
401
402 if (WizardMode) {
403 // dump the size of the byte codes
404 tty->print(" {%d}", code_size());
405 }
406 tty->cr();
407
408 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
409 tty->print_cr (" invocation_counter: %8d ", invocation_count());
410 tty->print_cr (" backedge_counter: %8d ", backedge_count());
411 #ifndef PRODUCT
412 if (CountCompiledCalls) {
413 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
414 }
415 #endif
416 }
417
418 // Build a MethodData* object to hold information about this method
419 // collected in the interpreter.
420 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) {
421 // Do not profile the method if metaspace has hit an OOM previously
422 // allocating profiling data. Callers clear pending exception so don't
423 // add one here.
424 if (ClassLoaderDataGraph::has_metaspace_oom()) {
425 return;
426 }
427
428 // Grab a lock here to prevent multiple
429 // MethodData*s from being created.
430 MutexLocker ml(MethodData_lock, THREAD);
431 if (method->method_data() == NULL) {
432 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
433 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
434 if (HAS_PENDING_EXCEPTION) {
435 CompileBroker::log_metaspace_failure();
436 ClassLoaderDataGraph::set_metaspace_oom(true);
437 return; // return the exception (which is cleared)
438 }
439
440 method->set_method_data(method_data);
441 if (PrintMethodData && (Verbose || WizardMode)) {
442 ResourceMark rm(THREAD);
443 tty->print("build_interpreter_method_data for ");
444 method->print_name(tty);
445 tty->cr();
446 // At the end of the run, the MDO, full of data, will be dumped.
447 }
448 }
449 }
450
451 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
452 // Do not profile the method if metaspace has hit an OOM previously
453 if (ClassLoaderDataGraph::has_metaspace_oom()) {
454 return NULL;
455 }
456
457 methodHandle mh(m);
458 MethodCounters* counters = MethodCounters::allocate(mh, THREAD);
459 if (HAS_PENDING_EXCEPTION) {
460 CompileBroker::log_metaspace_failure();
461 ClassLoaderDataGraph::set_metaspace_oom(true);
462 return NULL; // return the exception (which is cleared)
463 }
464 if (!mh->init_method_counters(counters)) {
465 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
466 }
467
468 if (LogTouchedMethods) {
469 mh->log_touched(CHECK_NULL);
470 }
471
472 return mh->method_counters();
473 }
474
475 bool Method::init_method_counters(MethodCounters* counters) {
476 // Try to install a pointer to MethodCounters, return true on success.
477 return Atomic::replace_if_null(counters, &_method_counters);
478 }
479
480 int Method::extra_stack_words() {
481 // not an inline function, to avoid a header dependency on Interpreter
482 return extra_stack_entries() * Interpreter::stackElementSize;
483 }
484
485
486 void Method::compute_size_of_parameters(Thread *thread) {
487 ArgumentSizeComputer asc(signature());
488 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
489 }
490
491 BasicType Method::result_type() const {
492 ResultTypeFinder rtf(signature());
493 return rtf.type();
494 }
495
496 #ifdef ASSERT
497 // ValueKlass the method is declared to return. This must not
498 // safepoint as it is called with references live on the stack at
499 // locations the GC is unaware of.
500 ValueKlass* Method::returned_value_type(Thread* thread) const {
501 SignatureStream ss(signature());
502 while (!ss.at_return_type()) {
503 ss.next();
504 }
505 Handle class_loader(thread, method_holder()->class_loader());
506 Handle protection_domain(thread, method_holder()->protection_domain());
507 Klass* k = NULL;
508 {
509 NoSafepointVerifier nsv;
510 k = ss.as_klass(class_loader, protection_domain, SignatureStream::ReturnNull, thread);
511 }
512 assert(k != NULL && !thread->has_pending_exception(), "can't resolve klass");
513 return ValueKlass::cast(k);
514 }
515 #endif
516
517 bool Method::is_empty_method() const {
518 return code_size() == 1
519 && *code_base() == Bytecodes::_return;
520 }
521
522
523 bool Method::is_vanilla_constructor() const {
524 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
525 // which only calls the superclass vanilla constructor and possibly does stores of
526 // zero constants to local fields:
527 //
528 // aload_0
529 // invokespecial
530 // indexbyte1
531 // indexbyte2
532 //
533 // followed by an (optional) sequence of:
534 //
535 // aload_0
536 // aconst_null / iconst_0 / fconst_0 / dconst_0
537 // putfield
538 // indexbyte1
539 // indexbyte2
540 //
541 // followed by:
542 //
543 // return
544
545 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
546 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
547 int size = code_size();
548 // Check if size match
549 if (size == 0 || size % 5 != 0) return false;
550 address cb = code_base();
551 int last = size - 1;
552 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
553 // Does not call superclass default constructor
554 return false;
555 }
556 // Check optional sequence
557 for (int i = 4; i < last; i += 5) {
558 if (cb[i] != Bytecodes::_aload_0) return false;
559 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
560 if (cb[i+2] != Bytecodes::_putfield) return false;
561 }
562 return true;
563 }
564
565
566 bool Method::compute_has_loops_flag() {
567 BytecodeStream bcs(this);
568 Bytecodes::Code bc;
569
570 while ((bc = bcs.next()) >= 0) {
571 switch( bc ) {
572 case Bytecodes::_ifeq:
573 case Bytecodes::_ifnull:
574 case Bytecodes::_iflt:
575 case Bytecodes::_ifle:
576 case Bytecodes::_ifne:
577 case Bytecodes::_ifnonnull:
578 case Bytecodes::_ifgt:
579 case Bytecodes::_ifge:
580 case Bytecodes::_if_icmpeq:
581 case Bytecodes::_if_icmpne:
582 case Bytecodes::_if_icmplt:
583 case Bytecodes::_if_icmpgt:
584 case Bytecodes::_if_icmple:
585 case Bytecodes::_if_icmpge:
586 case Bytecodes::_if_acmpeq:
587 case Bytecodes::_if_acmpne:
588 case Bytecodes::_goto:
589 case Bytecodes::_jsr:
590 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
591 break;
592
593 case Bytecodes::_goto_w:
594 case Bytecodes::_jsr_w:
595 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
596 break;
597
598 default:
599 break;
600 }
601 }
602 _access_flags.set_loops_flag_init();
603 return _access_flags.has_loops();
604 }
605
606 bool Method::is_final_method(AccessFlags class_access_flags) const {
607 // or "does_not_require_vtable_entry"
608 // default method or overpass can occur, is not final (reuses vtable entry)
609 // private methods in classes get vtable entries for backward class compatibility.
610 if (is_overpass() || is_default_method()) return false;
611 return is_final() || class_access_flags.is_final();
612 }
613
614 bool Method::is_final_method() const {
615 return is_final_method(method_holder()->access_flags());
616 }
617
618 bool Method::is_default_method() const {
619 if (method_holder() != NULL &&
620 method_holder()->is_interface() &&
621 !is_abstract() && !is_private()) {
622 return true;
623 } else {
624 return false;
625 }
626 }
627
628 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
629 if (is_final_method(class_access_flags)) return true;
630 #ifdef ASSERT
631 ResourceMark rm;
632 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
633 if (class_access_flags.is_interface()) {
634 assert(is_nonv == is_static() || is_nonv == is_private(),
635 "nonvirtual unexpected for non-static, non-private: %s",
636 name_and_sig_as_C_string());
637 }
638 #endif
639 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
640 return vtable_index() == nonvirtual_vtable_index;
641 }
642
643 bool Method::can_be_statically_bound() const {
644 return can_be_statically_bound(method_holder()->access_flags());
645 }
646
647 bool Method::is_accessor() const {
648 return is_getter() || is_setter();
649 }
650
651 bool Method::is_getter() const {
652 if (code_size() != 5) return false;
653 if (size_of_parameters() != 1) return false;
654 if (java_code_at(0) != Bytecodes::_aload_0) return false;
655 if (java_code_at(1) != Bytecodes::_getfield) return false;
656 switch (java_code_at(4)) {
657 case Bytecodes::_ireturn:
658 case Bytecodes::_lreturn:
659 case Bytecodes::_freturn:
660 case Bytecodes::_dreturn:
661 case Bytecodes::_areturn:
662 break;
663 default:
664 return false;
665 }
666 return true;
667 }
668
669 bool Method::is_setter() const {
670 if (code_size() != 6) return false;
671 if (java_code_at(0) != Bytecodes::_aload_0) return false;
672 switch (java_code_at(1)) {
673 case Bytecodes::_iload_1:
674 case Bytecodes::_aload_1:
675 case Bytecodes::_fload_1:
676 if (size_of_parameters() != 2) return false;
677 break;
678 case Bytecodes::_dload_1:
679 case Bytecodes::_lload_1:
680 if (size_of_parameters() != 3) return false;
681 break;
682 default:
683 return false;
684 }
685 if (java_code_at(2) != Bytecodes::_putfield) return false;
686 if (java_code_at(5) != Bytecodes::_return) return false;
687 return true;
688 }
689
690 bool Method::is_constant_getter() const {
691 int last_index = code_size() - 1;
692 // Check if the first 1-3 bytecodes are a constant push
693 // and the last bytecode is a return.
694 return (2 <= code_size() && code_size() <= 4 &&
695 Bytecodes::is_const(java_code_at(0)) &&
696 Bytecodes::length_for(java_code_at(0)) == last_index &&
697 Bytecodes::is_return(java_code_at(last_index)));
698 }
699
700 bool Method::is_object_constructor_or_class_initializer() const {
701 return (is_object_constructor() || is_class_initializer());
702 }
703
704 bool Method::is_class_initializer() const {
705 // For classfiles version 51 or greater, ensure that the clinit method is
706 // static. Non-static methods with the name "<clinit>" are not static
707 // initializers. (older classfiles exempted for backward compatibility)
708 return (name() == vmSymbols::class_initializer_name() &&
709 (is_static() ||
710 method_holder()->major_version() < 51));
711 }
712
713 // A method named <init>, if non-static, is a classic object constructor.
714 bool Method::is_object_constructor() const {
715 return name() == vmSymbols::object_initializer_name() && !is_static();
716 }
717
718 // A static method named <init> is a factory for an inline class.
719 bool Method::is_static_init_factory() const {
720 return name() == vmSymbols::object_initializer_name() && is_static();
721 }
722
723 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
724 int length = method->checked_exceptions_length();
725 if (length == 0) { // common case
726 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
727 } else {
728 methodHandle h_this(THREAD, method);
729 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
730 objArrayHandle mirrors (THREAD, m_oop);
731 for (int i = 0; i < length; i++) {
732 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
733 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
734 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
735 mirrors->obj_at_put(i, k->java_mirror());
736 }
737 return mirrors;
738 }
739 };
740
741
742 int Method::line_number_from_bci(int bci) const {
743 int best_bci = 0;
744 int best_line = -1;
745 if (bci == SynchronizationEntryBCI) bci = 0;
746 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
747 // The line numbers are a short array of 2-tuples [start_pc, line_number].
748 // Not necessarily sorted and not necessarily one-to-one.
749 CompressedLineNumberReadStream stream(compressed_linenumber_table());
750 while (stream.read_pair()) {
751 if (stream.bci() == bci) {
752 // perfect match
753 return stream.line();
754 } else {
755 // update best_bci/line
756 if (stream.bci() < bci && stream.bci() >= best_bci) {
757 best_bci = stream.bci();
758 best_line = stream.line();
759 }
760 }
761 }
762 }
763 return best_line;
764 }
765
766
767 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
768 if( constants()->tag_at(klass_index).is_unresolved_klass()) {
769 Thread *thread = Thread::current();
770 Symbol* klass_name = constants()->klass_name_at(klass_index);
771 Handle loader(thread, method_holder()->class_loader());
772 Handle prot (thread, method_holder()->protection_domain());
773 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
774 } else {
775 return true;
776 }
777 }
778
779
780 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
781 int klass_index = constants()->klass_ref_index_at(refinfo_index);
782 if (must_be_resolved) {
783 // Make sure klass is resolved in constantpool.
784 if (constants()->tag_at(klass_index).is_unresolved_klass()) {
785 return false;
786 }
787 }
788 return is_klass_loaded_by_klass_index(klass_index);
789 }
790
791
792 void Method::set_native_function(address function, bool post_event_flag) {
793 assert(function != NULL, "use clear_native_function to unregister natives");
794 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
795 address* native_function = native_function_addr();
796
797 // We can see racers trying to place the same native function into place. Once
798 // is plenty.
799 address current = *native_function;
800 if (current == function) return;
801 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
802 function != NULL) {
803 // native_method_throw_unsatisfied_link_error_entry() should only
804 // be passed when post_event_flag is false.
805 assert(function !=
806 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
807 "post_event_flag mis-match");
808
809 // post the bind event, and possible change the bind function
810 JvmtiExport::post_native_method_bind(this, &function);
811 }
812 *native_function = function;
813 // This function can be called more than once. We must make sure that we always
814 // use the latest registered method -> check if a stub already has been generated.
815 // If so, we have to make it not_entrant.
816 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates
817 if (nm != NULL) {
818 nm->make_not_entrant();
819 }
820 }
821
822
823 bool Method::has_native_function() const {
824 if (is_method_handle_intrinsic())
825 return false; // special-cased in SharedRuntime::generate_native_wrapper
826 address func = native_function();
827 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
828 }
829
830
831 void Method::clear_native_function() {
832 // Note: is_method_handle_intrinsic() is allowed here.
833 set_native_function(
834 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
835 !native_bind_event_is_interesting);
836 clear_code();
837 }
838
839 address Method::critical_native_function() {
840 methodHandle mh(this);
841 return NativeLookup::lookup_critical_entry(mh);
842 }
843
844
845 void Method::set_signature_handler(address handler) {
846 address* signature_handler = signature_handler_addr();
847 *signature_handler = handler;
848 }
849
850
851 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
852 if (PrintCompilation && report) {
853 ttyLocker ttyl;
854 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
855 if (comp_level == CompLevel_all) {
856 tty->print("all levels ");
857 } else {
858 tty->print("levels ");
859 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
860 tty->print("%d ", i);
861 }
862 }
863 this->print_short_name(tty);
864 int size = this->code_size();
865 if (size > 0) {
866 tty->print(" (%d bytes)", size);
867 }
868 if (reason != NULL) {
869 tty->print(" %s", reason);
870 }
871 tty->cr();
872 }
873 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
874 ttyLocker ttyl;
875 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
876 os::current_thread_id(), is_osr, comp_level);
877 if (reason != NULL) {
878 xtty->print(" reason=\'%s\'", reason);
879 }
880 xtty->method(this);
881 xtty->stamp();
882 xtty->end_elem();
883 }
884 }
885
886 bool Method::is_always_compilable() const {
887 // Generated adapters must be compiled
888 if (is_method_handle_intrinsic() && is_synthetic()) {
889 assert(!is_not_c1_compilable(), "sanity check");
890 assert(!is_not_c2_compilable(), "sanity check");
891 return true;
892 }
893
894 return false;
895 }
896
897 bool Method::is_not_compilable(int comp_level) const {
898 if (number_of_breakpoints() > 0)
899 return true;
900 if (is_always_compilable())
901 return false;
902 if (comp_level == CompLevel_any)
903 return is_not_c1_compilable() || is_not_c2_compilable();
904 if (is_c1_compile(comp_level))
905 return is_not_c1_compilable();
906 if (is_c2_compile(comp_level))
907 return is_not_c2_compilable();
908 return false;
909 }
910
911 // call this when compiler finds that this method is not compilable
912 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
913 if (is_always_compilable()) {
914 // Don't mark a method which should be always compilable
915 return;
916 }
917 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
918 if (comp_level == CompLevel_all) {
919 set_not_c1_compilable();
920 set_not_c2_compilable();
921 } else {
922 if (is_c1_compile(comp_level))
923 set_not_c1_compilable();
924 if (is_c2_compile(comp_level))
925 set_not_c2_compilable();
926 }
927 CompilationPolicy::policy()->disable_compilation(this);
928 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
929 }
930
931 bool Method::is_not_osr_compilable(int comp_level) const {
932 if (is_not_compilable(comp_level))
933 return true;
934 if (comp_level == CompLevel_any)
935 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
936 if (is_c1_compile(comp_level))
937 return is_not_c1_osr_compilable();
938 if (is_c2_compile(comp_level))
939 return is_not_c2_osr_compilable();
940 return false;
941 }
942
943 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
944 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
945 if (comp_level == CompLevel_all) {
946 set_not_c1_osr_compilable();
947 set_not_c2_osr_compilable();
948 } else {
949 if (is_c1_compile(comp_level))
950 set_not_c1_osr_compilable();
951 if (is_c2_compile(comp_level))
952 set_not_c2_osr_compilable();
953 }
954 CompilationPolicy::policy()->disable_compilation(this);
955 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
956 }
957
958 // Revert to using the interpreter and clear out the nmethod
959 void Method::clear_code(bool acquire_lock /* = true */) {
960 MutexLockerEx pl(acquire_lock ? Patching_lock : NULL, Mutex::_no_safepoint_check_flag);
961 // this may be NULL if c2i adapters have not been made yet
962 // Only should happen at allocate time.
963 if (adapter() == NULL) {
964 _from_compiled_entry = NULL;
965 _from_compiled_value_entry = NULL;
966 _from_compiled_value_ro_entry = NULL;
967 } else {
968 _from_compiled_entry = adapter()->get_c2i_entry();
969 _from_compiled_value_entry = adapter()->get_c2i_value_entry();
970 _from_compiled_value_ro_entry = adapter()->get_c2i_value_ro_entry();
971 }
972 OrderAccess::storestore();
973 _from_interpreted_entry = _i2i_entry;
974 OrderAccess::storestore();
975 _code = NULL;
976 }
977
978 #if INCLUDE_CDS
979 // Called by class data sharing to remove any entry points (which are not shared)
980 void Method::unlink_method() {
981 _code = NULL;
982
983 assert(DumpSharedSpaces, "dump time only");
984 // Set the values to what they should be at run time. Note that
985 // this Method can no longer be executed during dump time.
986 _i2i_entry = Interpreter::entry_for_cds_method(this);
987 _from_interpreted_entry = _i2i_entry;
988
989 if (is_native()) {
990 *native_function_addr() = NULL;
991 set_signature_handler(NULL);
992 }
993 NOT_PRODUCT(set_compiled_invocation_count(0);)
994
995 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter();
996 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline());
997 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline();
998 assert(*((int*)_from_compiled_entry) == 0, "must be NULL during dump time, to be initialized at run time");
999 _from_compiled_value_entry = cds_adapter->get_c2i_entry_trampoline();
1000 assert(*((int*)_from_compiled_value_entry) == 0, "must be NULL during dump time, to be initialized at run time");
1001 _from_compiled_value_ro_entry = cds_adapter->get_c2i_entry_trampoline();
1002 assert(*((int*)_from_compiled_value_ro_entry) == 0, "must be NULL during dump time, to be initialized at run time");
1003
1004 set_method_data(NULL);
1005 clear_method_counters();
1006 }
1007 #endif
1008
1009 /****************************************************************************
1010 // The following illustrates how the entries work for CDS shared Methods:
1011 //
1012 // Our goal is to delay writing into a shared Method until it's compiled.
1013 // Hence, we want to determine the initial values for _i2i_entry,
1014 // _from_interpreted_entry and _from_compiled_entry during CDS dump time.
1015 //
1016 // In this example, both Methods A and B have the _i2i_entry of "zero_locals".
1017 // They also have similar signatures so that they will share the same
1018 // AdapterHandlerEntry.
1019 //
1020 // _adapter_trampoline points to a fixed location in the RW section of
1021 // the CDS archive. This location initially contains a NULL pointer. When the
1022 // first of method A or B is linked, an AdapterHandlerEntry is allocated
1023 // dynamically, and its c2i/i2c entries are generated.
1024 //
1025 // _i2i_entry and _from_interpreted_entry initially points to the same
1026 // (fixed) location in the CODE section of the CDS archive. This contains
1027 // an unconditional branch to the actual entry for "zero_locals", which is
1028 // generated at run time and may be on an arbitrary address. Thus, the
1029 // unconditional branch is also generated at run time to jump to the correct
1030 // address.
1031 //
1032 // Similarly, _from_compiled_entry points to a fixed address in the CODE
1033 // section. This address has enough space for an unconditional branch
1034 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is
1035 // initialized, and the address for the actual c2i_entry is known, we emit a
1036 // branch instruction here to branch to the actual c2i_entry.
1037 //
1038 // The effect of the extra branch on the i2i and c2i entries is negligible.
1039 //
1040 // The reason for putting _adapter_trampoline in RO is many shared Methods
1041 // share the same AdapterHandlerEntry, so we can save space in the RW section
1042 // by having the extra indirection.
1043
1044
1045 [Method A: RW]
1046 _constMethod ----> [ConstMethod: RO]
1047 _adapter_trampoline -----------+
1048 |
1049 _i2i_entry (same value as method B) |
1050 _from_interpreted_entry (same value as method B) |
1051 _from_compiled_entry (same value as method B) |
1052 |
1053 |
1054 [Method B: RW] +--------+
1055 _constMethod ----> [ConstMethod: RO] |
1056 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+
1057 |
1058 +-------------------------------+
1059 |
1060 +----> [AdapterHandlerEntry] (allocated at run time)
1061 _fingerprint
1062 _c2i_entry ---------------------------------+->[c2i entry..]
1063 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] |
1064 _from_interpreted_entry | _c2i_unverified_entry | |
1065 | | | |
1066 | | (_cds_entry_table: CODE) | |
1067 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | |
1068 | | (allocated at run time) | |
1069 | | ... [asm code ...] | |
1070 +-[not compiled]-+ [n]: jmp _entry_table[n] | |
1071 | | |
1072 | | |
1073 +-[compiled]-------------------------------------------------------------------+ |
1074 |
1075 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) |
1076 [jmp c2i_entry] ------------------------------------------------------+
1077
1078 ***/
1079
1080 // Called when the method_holder is getting linked. Setup entrypoints so the method
1081 // is ready to be called from interpreter, compiler, and vtables.
1082 void Method::link_method(const methodHandle& h_method, TRAPS) {
1083 // If the code cache is full, we may reenter this function for the
1084 // leftover methods that weren't linked.
1085 if (is_shared()) {
1086 address entry = Interpreter::entry_for_cds_method(h_method);
1087 assert(entry != NULL && entry == _i2i_entry,
1088 "should be correctly set during dump time");
1089 if (adapter() != NULL) {
1090 return;
1091 }
1092 assert(entry == _from_interpreted_entry,
1093 "should be correctly set during dump time");
1094 } else if (_i2i_entry != NULL) {
1095 return;
1096 }
1097 assert( _code == NULL, "nothing compiled yet" );
1098
1099 // Setup interpreter entrypoint
1100 assert(this == h_method(), "wrong h_method()" );
1101
1102 if (!is_shared()) {
1103 assert(adapter() == NULL, "init'd to NULL");
1104 address entry = Interpreter::entry_for_method(h_method);
1105 assert(entry != NULL, "interpreter entry must be non-null");
1106 // Sets both _i2i_entry and _from_interpreted_entry
1107 set_interpreter_entry(entry);
1108 }
1109
1110 // Don't overwrite already registered native entries.
1111 if (is_native() && !has_native_function()) {
1112 set_native_function(
1113 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1114 !native_bind_event_is_interesting);
1115 }
1116
1117 // Setup compiler entrypoint. This is made eagerly, so we do not need
1118 // special handling of vtables. An alternative is to make adapters more
1119 // lazily by calling make_adapter() from from_compiled_entry() for the
1120 // normal calls. For vtable calls life gets more complicated. When a
1121 // call-site goes mega-morphic we need adapters in all methods which can be
1122 // called from the vtable. We need adapters on such methods that get loaded
1123 // later. Ditto for mega-morphic itable calls. If this proves to be a
1124 // problem we'll make these lazily later.
1125 (void) make_adapters(h_method, CHECK);
1126
1127 // ONLY USE the h_method now as make_adapter may have blocked
1128
1129 }
1130
1131 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1132 // Adapters for compiled code are made eagerly here. They are fairly
1133 // small (generally < 100 bytes) and quick to make (and cached and shared)
1134 // so making them eagerly shouldn't be too expensive.
1135 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1136 if (adapter == NULL ) {
1137 if (!is_init_completed()) {
1138 // Don't throw exceptions during VM initialization because java.lang.* classes
1139 // might not have been initialized, causing problems when constructing the
1140 // Java exception object.
1141 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1142 } else {
1143 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1144 }
1145 }
1146
1147 if (mh->is_shared()) {
1148 assert(mh->adapter() == adapter, "must be");
1149 assert(mh->_from_compiled_entry != NULL, "must be");
1150 assert(mh->_from_compiled_value_entry != NULL, "must be");
1151 assert(mh->_from_compiled_value_ro_entry != NULL, "must be");
1152 } else {
1153 mh->set_adapter_entry(adapter);
1154 mh->_from_compiled_entry = adapter->get_c2i_entry();
1155 mh->_from_compiled_value_entry = adapter->get_c2i_value_entry();
1156 mh->_from_compiled_value_ro_entry = adapter->get_c2i_value_ro_entry();
1157 }
1158 return adapter->get_c2i_entry();
1159 }
1160
1161 void Method::restore_unshareable_info(TRAPS) {
1162 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
1163
1164 // Since restore_unshareable_info can be called more than once for a method, don't
1165 // redo any work.
1166 if (adapter() == NULL) {
1167 methodHandle mh(THREAD, this);
1168 link_method(mh, CHECK);
1169 }
1170 }
1171
1172 address Method::from_compiled_entry_no_trampoline() const {
1173 CompiledMethod *code = OrderAccess::load_acquire(&_code);
1174 if (code) {
1175 return code->verified_entry_point();
1176 } else {
1177 return adapter()->get_c2i_entry();
1178 }
1179 }
1180
1181 // The verified_code_entry() must be called when a invoke is resolved
1182 // on this method.
1183
1184 // It returns the compiled code entry point, after asserting not null.
1185 // This function is called after potential safepoints so that nmethod
1186 // or adapter that it points to is still live and valid.
1187 // This function must not hit a safepoint!
1188 address Method::verified_code_entry() {
1189 debug_only(NoSafepointVerifier nsv;)
1190 assert(_from_compiled_entry != NULL, "must be set");
1191 return _from_compiled_entry;
1192 }
1193
1194 address Method::verified_value_code_entry() {
1195 debug_only(NoSafepointVerifier nsv;)
1196 assert(_from_compiled_value_entry != NULL, "must be set");
1197 return _from_compiled_value_entry;
1198 }
1199
1200 address Method::verified_value_ro_code_entry() {
1201 debug_only(NoSafepointVerifier nsv;)
1202 assert(_from_compiled_value_ro_entry != NULL, "must be set");
1203 return _from_compiled_value_ro_entry;
1204 }
1205
1206 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1207 // (could be racing a deopt).
1208 // Not inline to avoid circular ref.
1209 bool Method::check_code() const {
1210 // cached in a register or local. There's a race on the value of the field.
1211 CompiledMethod *code = OrderAccess::load_acquire(&_code);
1212 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
1213 }
1214
1215 // Install compiled code. Instantly it can execute.
1216 void Method::set_code(const methodHandle& mh, CompiledMethod *code) {
1217 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1218 assert( code, "use clear_code to remove code" );
1219 assert( mh->check_code(), "" );
1220
1221 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
1222
1223 // These writes must happen in this order, because the interpreter will
1224 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1225 // which jumps to _from_compiled_entry.
1226 mh->_code = code; // Assign before allowing compiled code to exec
1227
1228 int comp_level = code->comp_level();
1229 // In theory there could be a race here. In practice it is unlikely
1230 // and not worth worrying about.
1231 if (comp_level > mh->highest_comp_level()) {
1232 mh->set_highest_comp_level(comp_level);
1233 }
1234
1235 OrderAccess::storestore();
1236 mh->_from_compiled_entry = code->verified_entry_point();
1237 mh->_from_compiled_value_entry = code->verified_value_entry_point();
1238 mh->_from_compiled_value_ro_entry = code->verified_value_ro_entry_point();
1239 OrderAccess::storestore();
1240 // Instantly compiled code can execute.
1241 if (!mh->is_method_handle_intrinsic())
1242 mh->_from_interpreted_entry = mh->get_i2c_entry();
1243 }
1244
1245
1246 bool Method::is_overridden_in(Klass* k) const {
1247 InstanceKlass* ik = InstanceKlass::cast(k);
1248
1249 if (ik->is_interface()) return false;
1250
1251 // If method is an interface, we skip it - except if it
1252 // is a miranda method
1253 if (method_holder()->is_interface()) {
1254 // Check that method is not a miranda method
1255 if (ik->lookup_method(name(), signature()) == NULL) {
1256 // No implementation exist - so miranda method
1257 return false;
1258 }
1259 return true;
1260 }
1261
1262 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1263 if (!has_vtable_index()) {
1264 return false;
1265 } else {
1266 Method* vt_m = ik->method_at_vtable(vtable_index());
1267 return vt_m != this;
1268 }
1269 }
1270
1271
1272 // give advice about whether this Method* should be cached or not
1273 bool Method::should_not_be_cached() const {
1274 if (is_old()) {
1275 // This method has been redefined. It is either EMCP or obsolete
1276 // and we don't want to cache it because that would pin the method
1277 // down and prevent it from being collectible if and when it
1278 // finishes executing.
1279 return true;
1280 }
1281
1282 // caching this method should be just fine
1283 return false;
1284 }
1285
1286
1287 /**
1288 * Returns true if this is one of the specially treated methods for
1289 * security related stack walks (like Reflection.getCallerClass).
1290 */
1291 bool Method::is_ignored_by_security_stack_walk() const {
1292 if (intrinsic_id() == vmIntrinsics::_invoke) {
1293 // This is Method.invoke() -- ignore it
1294 return true;
1295 }
1296 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1297 // This is an auxilary frame -- ignore it
1298 return true;
1299 }
1300 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1301 // This is an internal adapter frame for method handles -- ignore it
1302 return true;
1303 }
1304 return false;
1305 }
1306
1307
1308 // Constant pool structure for invoke methods:
1309 enum {
1310 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1311 _imcp_invoke_signature, // utf8: (variable Symbol*)
1312 _imcp_limit
1313 };
1314
1315 // Test if this method is an MH adapter frame generated by Java code.
1316 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1317 bool Method::is_compiled_lambda_form() const {
1318 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1319 }
1320
1321 // Test if this method is an internal MH primitive method.
1322 bool Method::is_method_handle_intrinsic() const {
1323 vmIntrinsics::ID iid = intrinsic_id();
1324 return (MethodHandles::is_signature_polymorphic(iid) &&
1325 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1326 }
1327
1328 bool Method::has_member_arg() const {
1329 vmIntrinsics::ID iid = intrinsic_id();
1330 return (MethodHandles::is_signature_polymorphic(iid) &&
1331 MethodHandles::has_member_arg(iid));
1332 }
1333
1334 // Make an instance of a signature-polymorphic internal MH primitive.
1335 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1336 Symbol* signature,
1337 TRAPS) {
1338 ResourceMark rm;
1339 methodHandle empty;
1340
1341 InstanceKlass* holder = SystemDictionary::MethodHandle_klass();
1342 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1343 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1344 if (TraceMethodHandles) {
1345 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1346 }
1347
1348 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1349 name->increment_refcount();
1350 signature->increment_refcount();
1351
1352 int cp_length = _imcp_limit;
1353 ClassLoaderData* loader_data = holder->class_loader_data();
1354 constantPoolHandle cp;
1355 {
1356 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1357 cp = constantPoolHandle(THREAD, cp_oop);
1358 }
1359 cp->set_pool_holder(holder);
1360 cp->symbol_at_put(_imcp_invoke_name, name);
1361 cp->symbol_at_put(_imcp_invoke_signature, signature);
1362 cp->set_has_preresolution();
1363
1364 // decide on access bits: public or not?
1365 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1366 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1367 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1368 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1369
1370 methodHandle m;
1371 {
1372 InlineTableSizes sizes;
1373 Method* m_oop = Method::allocate(loader_data, 0,
1374 accessFlags_from(flags_bits), &sizes,
1375 ConstMethod::NORMAL, CHECK_(empty));
1376 m = methodHandle(THREAD, m_oop);
1377 }
1378 m->set_constants(cp());
1379 m->set_name_index(_imcp_invoke_name);
1380 m->set_signature_index(_imcp_invoke_signature);
1381 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1382 assert(m->signature() == signature, "");
1383 ResultTypeFinder rtf(signature);
1384 m->constMethod()->set_result_type(rtf.type());
1385 m->compute_size_of_parameters(THREAD);
1386 m->init_intrinsic_id();
1387 assert(m->is_method_handle_intrinsic(), "");
1388 #ifdef ASSERT
1389 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1390 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1391 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1392 #endif //ASSERT
1393
1394 // Finally, set up its entry points.
1395 assert(m->can_be_statically_bound(), "");
1396 m->set_vtable_index(Method::nonvirtual_vtable_index);
1397 m->link_method(m, CHECK_(empty));
1398
1399 if (TraceMethodHandles && (Verbose || WizardMode)) {
1400 ttyLocker ttyl;
1401 m->print_on(tty);
1402 }
1403
1404 return m;
1405 }
1406
1407 Klass* Method::check_non_bcp_klass(Klass* klass) {
1408 if (klass != NULL && klass->class_loader() != NULL) {
1409 if (klass->is_objArray_klass())
1410 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1411 return klass;
1412 }
1413 return NULL;
1414 }
1415
1416
1417 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1418 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1419 // Code below does not work for native methods - they should never get rewritten anyway
1420 assert(!m->is_native(), "cannot rewrite native methods");
1421 // Allocate new Method*
1422 AccessFlags flags = m->access_flags();
1423
1424 ConstMethod* cm = m->constMethod();
1425 int checked_exceptions_len = cm->checked_exceptions_length();
1426 int localvariable_len = cm->localvariable_table_length();
1427 int exception_table_len = cm->exception_table_length();
1428 int method_parameters_len = cm->method_parameters_length();
1429 int method_annotations_len = cm->method_annotations_length();
1430 int parameter_annotations_len = cm->parameter_annotations_length();
1431 int type_annotations_len = cm->type_annotations_length();
1432 int default_annotations_len = cm->default_annotations_length();
1433
1434 InlineTableSizes sizes(
1435 localvariable_len,
1436 new_compressed_linenumber_size,
1437 exception_table_len,
1438 checked_exceptions_len,
1439 method_parameters_len,
1440 cm->generic_signature_index(),
1441 method_annotations_len,
1442 parameter_annotations_len,
1443 type_annotations_len,
1444 default_annotations_len,
1445 0);
1446
1447 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1448 Method* newm_oop = Method::allocate(loader_data,
1449 new_code_length,
1450 flags,
1451 &sizes,
1452 m->method_type(),
1453 CHECK_(methodHandle()));
1454 methodHandle newm (THREAD, newm_oop);
1455
1456 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1457 ConstMethod* newcm = newm->constMethod();
1458 int new_const_method_size = newm->constMethod()->size();
1459
1460 // This works because the source and target are both Methods. Some compilers
1461 // (e.g., clang) complain that the target vtable pointer will be stomped,
1462 // so cast away newm()'s and m()'s Methodness.
1463 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1464
1465 // Create shallow copy of ConstMethod.
1466 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1467
1468 // Reset correct method/const method, method size, and parameter info
1469 newm->set_constMethod(newcm);
1470 newm->constMethod()->set_code_size(new_code_length);
1471 newm->constMethod()->set_constMethod_size(new_const_method_size);
1472 assert(newm->code_size() == new_code_length, "check");
1473 assert(newm->method_parameters_length() == method_parameters_len, "check");
1474 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1475 assert(newm->exception_table_length() == exception_table_len, "check");
1476 assert(newm->localvariable_table_length() == localvariable_len, "check");
1477 // Copy new byte codes
1478 memcpy(newm->code_base(), new_code, new_code_length);
1479 // Copy line number table
1480 if (new_compressed_linenumber_size > 0) {
1481 memcpy(newm->compressed_linenumber_table(),
1482 new_compressed_linenumber_table,
1483 new_compressed_linenumber_size);
1484 }
1485 // Copy method_parameters
1486 if (method_parameters_len > 0) {
1487 memcpy(newm->method_parameters_start(),
1488 m->method_parameters_start(),
1489 method_parameters_len * sizeof(MethodParametersElement));
1490 }
1491 // Copy checked_exceptions
1492 if (checked_exceptions_len > 0) {
1493 memcpy(newm->checked_exceptions_start(),
1494 m->checked_exceptions_start(),
1495 checked_exceptions_len * sizeof(CheckedExceptionElement));
1496 }
1497 // Copy exception table
1498 if (exception_table_len > 0) {
1499 memcpy(newm->exception_table_start(),
1500 m->exception_table_start(),
1501 exception_table_len * sizeof(ExceptionTableElement));
1502 }
1503 // Copy local variable number table
1504 if (localvariable_len > 0) {
1505 memcpy(newm->localvariable_table_start(),
1506 m->localvariable_table_start(),
1507 localvariable_len * sizeof(LocalVariableTableElement));
1508 }
1509 // Copy stackmap table
1510 if (m->has_stackmap_table()) {
1511 int code_attribute_length = m->stackmap_data()->length();
1512 Array<u1>* stackmap_data =
1513 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1514 memcpy((void*)stackmap_data->adr_at(0),
1515 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1516 newm->set_stackmap_data(stackmap_data);
1517 }
1518
1519 // copy annotations over to new method
1520 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL);
1521 return newm;
1522 }
1523
1524 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) {
1525 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1526 // because we are not loading from core libraries
1527 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1528 // which does not use the class default class loader so we check for its loader here
1529 const InstanceKlass* ik = InstanceKlass::cast(holder);
1530 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1531 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1532 }
1533
1534 // see if the klass name is well-known:
1535 Symbol* klass_name = ik->name();
1536 return vmSymbols::find_sid(klass_name);
1537 }
1538
1539 void Method::init_intrinsic_id() {
1540 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1541 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1542 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1543 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1544
1545 // the klass name is well-known:
1546 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1547 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1548
1549 // ditto for method and signature:
1550 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1551 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1552 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1553 && name_id == vmSymbols::NO_SID) {
1554 return;
1555 }
1556 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1557 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1558 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1559 && sig_id == vmSymbols::NO_SID) {
1560 return;
1561 }
1562 jshort flags = access_flags().as_short();
1563
1564 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1565 if (id != vmIntrinsics::_none) {
1566 set_intrinsic_id(id);
1567 if (id == vmIntrinsics::_Class_cast) {
1568 // Even if the intrinsic is rejected, we want to inline this simple method.
1569 set_force_inline(true);
1570 }
1571 return;
1572 }
1573
1574 // A few slightly irregular cases:
1575 switch (klass_id) {
1576 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1577 // Second chance: check in regular Math.
1578 switch (name_id) {
1579 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1580 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1581 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1582 // pretend it is the corresponding method in the non-strict class:
1583 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1584 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1585 break;
1586 default:
1587 break;
1588 }
1589 break;
1590
1591 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1592 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1593 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1594 if (!is_native()) break;
1595 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1596 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1597 id = vmIntrinsics::_none;
1598 break;
1599
1600 default:
1601 break;
1602 }
1603
1604 if (id != vmIntrinsics::_none) {
1605 // Set up its iid. It is an alias method.
1606 set_intrinsic_id(id);
1607 return;
1608 }
1609 }
1610
1611 // These two methods are static since a GC may move the Method
1612 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1613 if (!THREAD->can_call_java()) {
1614 // There is nothing useful this routine can do from within the Compile thread.
1615 // Hopefully, the signature contains only well-known classes.
1616 // We could scan for this and return true/false, but the caller won't care.
1617 return false;
1618 }
1619 bool sig_is_loaded = true;
1620 Handle class_loader(THREAD, m->method_holder()->class_loader());
1621 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1622 ResourceMark rm(THREAD);
1623 Symbol* signature = m->signature();
1624 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1625 if (ss.is_object()) {
1626 Symbol* sym = ss.as_symbol(CHECK_(false));
1627 Symbol* name = sym;
1628 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1629 protection_domain, THREAD);
1630 // We are loading classes eagerly. If a ClassNotFoundException or
1631 // a LinkageError was generated, be sure to ignore it.
1632 if (HAS_PENDING_EXCEPTION) {
1633 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1634 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1635 CLEAR_PENDING_EXCEPTION;
1636 } else {
1637 return false;
1638 }
1639 }
1640 if( klass == NULL) { sig_is_loaded = false; }
1641 }
1642 }
1643 return sig_is_loaded;
1644 }
1645
1646 bool Method::has_unloaded_classes_in_signature(const methodHandle& m, TRAPS) {
1647 Handle class_loader(THREAD, m->method_holder()->class_loader());
1648 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1649 ResourceMark rm(THREAD);
1650 Symbol* signature = m->signature();
1651 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1652 if (ss.type() == T_OBJECT) {
1653 Symbol* name = ss.as_symbol_or_null();
1654 if (name == NULL) return true;
1655 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1656 if (klass == NULL) return true;
1657 }
1658 }
1659 return false;
1660 }
1661
1662 // Exposed so field engineers can debug VM
1663 void Method::print_short_name(outputStream* st) {
1664 ResourceMark rm;
1665 #ifdef PRODUCT
1666 st->print(" %s::", method_holder()->external_name());
1667 #else
1668 st->print(" %s::", method_holder()->internal_name());
1669 #endif
1670 name()->print_symbol_on(st);
1671 if (WizardMode) signature()->print_symbol_on(st);
1672 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1673 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1674 }
1675
1676 // Comparer for sorting an object array containing
1677 // Method*s.
1678 static int method_comparator(Method* a, Method* b) {
1679 return a->name()->fast_compare(b->name());
1680 }
1681
1682 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1683 // default_methods also uses this without the ordering for fast find_method
1684 void Method::sort_methods(Array<Method*>* methods, bool set_idnums) {
1685 int length = methods->length();
1686 if (length > 1) {
1687 {
1688 NoSafepointVerifier nsv;
1689 QuickSort::sort(methods->data(), length, method_comparator, /*idempotent=*/false);
1690 }
1691 // Reset method ordering
1692 if (set_idnums) {
1693 for (int i = 0; i < length; i++) {
1694 Method* m = methods->at(i);
1695 m->set_method_idnum(i);
1696 m->set_orig_method_idnum(i);
1697 }
1698 }
1699 }
1700 }
1701
1702 //-----------------------------------------------------------------------------------
1703 // Non-product code unless JVM/TI needs it
1704
1705 #if !defined(PRODUCT) || INCLUDE_JVMTI
1706 class SignatureTypePrinter : public SignatureTypeNames {
1707 private:
1708 outputStream* _st;
1709 bool _use_separator;
1710
1711 void type_name(const char* name) {
1712 if (_use_separator) _st->print(", ");
1713 _st->print("%s", name);
1714 _use_separator = true;
1715 }
1716
1717 public:
1718 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1719 _st = st;
1720 _use_separator = false;
1721 }
1722
1723 void print_parameters() { _use_separator = false; iterate_parameters(); }
1724 void print_returntype() { _use_separator = false; iterate_returntype(); }
1725 };
1726
1727
1728 void Method::print_name(outputStream* st) {
1729 Thread *thread = Thread::current();
1730 ResourceMark rm(thread);
1731 st->print("%s ", is_static() ? "static" : "virtual");
1732 if (WizardMode) {
1733 st->print("%s.", method_holder()->internal_name());
1734 name()->print_symbol_on(st);
1735 signature()->print_symbol_on(st);
1736 } else {
1737 SignatureTypePrinter sig(signature(), st);
1738 sig.print_returntype();
1739 st->print(" %s.", method_holder()->internal_name());
1740 name()->print_symbol_on(st);
1741 st->print("(");
1742 sig.print_parameters();
1743 st->print(")");
1744 }
1745 }
1746 #endif // !PRODUCT || INCLUDE_JVMTI
1747
1748
1749 void Method::print_codes_on(outputStream* st) const {
1750 print_codes_on(0, code_size(), st);
1751 }
1752
1753 void Method::print_codes_on(int from, int to, outputStream* st) const {
1754 Thread *thread = Thread::current();
1755 ResourceMark rm(thread);
1756 methodHandle mh (thread, (Method*)this);
1757 BytecodeStream s(mh);
1758 s.set_interval(from, to);
1759 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1760 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1761 }
1762
1763 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1764 _bci = 0;
1765 _line = 0;
1766 };
1767
1768 bool CompressedLineNumberReadStream::read_pair() {
1769 jubyte next = read_byte();
1770 // Check for terminator
1771 if (next == 0) return false;
1772 if (next == 0xFF) {
1773 // Escape character, regular compression used
1774 _bci += read_signed_int();
1775 _line += read_signed_int();
1776 } else {
1777 // Single byte compression used
1778 _bci += next >> 3;
1779 _line += next & 0x7;
1780 }
1781 return true;
1782 }
1783
1784 #if INCLUDE_JVMTI
1785
1786 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1787 BreakpointInfo* bp = method_holder()->breakpoints();
1788 for (; bp != NULL; bp = bp->next()) {
1789 if (bp->match(this, bci)) {
1790 return bp->orig_bytecode();
1791 }
1792 }
1793 {
1794 ResourceMark rm;
1795 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1796 }
1797 return Bytecodes::_shouldnotreachhere;
1798 }
1799
1800 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1801 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1802 BreakpointInfo* bp = method_holder()->breakpoints();
1803 for (; bp != NULL; bp = bp->next()) {
1804 if (bp->match(this, bci)) {
1805 bp->set_orig_bytecode(code);
1806 // and continue, in case there is more than one
1807 }
1808 }
1809 }
1810
1811 void Method::set_breakpoint(int bci) {
1812 InstanceKlass* ik = method_holder();
1813 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1814 bp->set_next(ik->breakpoints());
1815 ik->set_breakpoints(bp);
1816 // do this last:
1817 bp->set(this);
1818 }
1819
1820 static void clear_matches(Method* m, int bci) {
1821 InstanceKlass* ik = m->method_holder();
1822 BreakpointInfo* prev_bp = NULL;
1823 BreakpointInfo* next_bp;
1824 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1825 next_bp = bp->next();
1826 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1827 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1828 // do this first:
1829 bp->clear(m);
1830 // unhook it
1831 if (prev_bp != NULL)
1832 prev_bp->set_next(next_bp);
1833 else
1834 ik->set_breakpoints(next_bp);
1835 delete bp;
1836 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1837 // at same location. So we have multiple matching (method_index and bci)
1838 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1839 // breakpoint for clear_breakpoint request and keep all other method versions
1840 // BreakpointInfo for future clear_breakpoint request.
1841 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1842 // which is being called when class is unloaded. We delete all the Breakpoint
1843 // information for all versions of method. We may not correctly restore the original
1844 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1845 // so these methods won't be used anymore.
1846 if (bci >= 0) {
1847 break;
1848 }
1849 } else {
1850 // This one is a keeper.
1851 prev_bp = bp;
1852 }
1853 }
1854 }
1855
1856 void Method::clear_breakpoint(int bci) {
1857 assert(bci >= 0, "");
1858 clear_matches(this, bci);
1859 }
1860
1861 void Method::clear_all_breakpoints() {
1862 clear_matches(this, -1);
1863 }
1864
1865 #endif // INCLUDE_JVMTI
1866
1867 int Method::invocation_count() {
1868 MethodCounters *mcs = method_counters();
1869 if (TieredCompilation) {
1870 MethodData* const mdo = method_data();
1871 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1872 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1873 return InvocationCounter::count_limit;
1874 } else {
1875 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1876 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1877 }
1878 } else {
1879 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1880 }
1881 }
1882
1883 int Method::backedge_count() {
1884 MethodCounters *mcs = method_counters();
1885 if (TieredCompilation) {
1886 MethodData* const mdo = method_data();
1887 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1888 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1889 return InvocationCounter::count_limit;
1890 } else {
1891 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1892 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1893 }
1894 } else {
1895 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1896 }
1897 }
1898
1899 int Method::highest_comp_level() const {
1900 const MethodCounters* mcs = method_counters();
1901 if (mcs != NULL) {
1902 return mcs->highest_comp_level();
1903 } else {
1904 return CompLevel_none;
1905 }
1906 }
1907
1908 int Method::highest_osr_comp_level() const {
1909 const MethodCounters* mcs = method_counters();
1910 if (mcs != NULL) {
1911 return mcs->highest_osr_comp_level();
1912 } else {
1913 return CompLevel_none;
1914 }
1915 }
1916
1917 void Method::set_highest_comp_level(int level) {
1918 MethodCounters* mcs = method_counters();
1919 if (mcs != NULL) {
1920 mcs->set_highest_comp_level(level);
1921 }
1922 }
1923
1924 void Method::set_highest_osr_comp_level(int level) {
1925 MethodCounters* mcs = method_counters();
1926 if (mcs != NULL) {
1927 mcs->set_highest_osr_comp_level(level);
1928 }
1929 }
1930
1931 #if INCLUDE_JVMTI
1932
1933 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1934 _bci = bci;
1935 _name_index = m->name_index();
1936 _signature_index = m->signature_index();
1937 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1938 if (_orig_bytecode == Bytecodes::_breakpoint)
1939 _orig_bytecode = m->orig_bytecode_at(_bci);
1940 _next = NULL;
1941 }
1942
1943 void BreakpointInfo::set(Method* method) {
1944 #ifdef ASSERT
1945 {
1946 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1947 if (code == Bytecodes::_breakpoint)
1948 code = method->orig_bytecode_at(_bci);
1949 assert(orig_bytecode() == code, "original bytecode must be the same");
1950 }
1951 #endif
1952 Thread *thread = Thread::current();
1953 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1954 method->incr_number_of_breakpoints(thread);
1955 SystemDictionary::notice_modification();
1956 {
1957 // Deoptimize all dependents on this method
1958 HandleMark hm(thread);
1959 methodHandle mh(thread, method);
1960 CodeCache::flush_dependents_on_method(mh);
1961 }
1962 }
1963
1964 void BreakpointInfo::clear(Method* method) {
1965 *method->bcp_from(_bci) = orig_bytecode();
1966 assert(method->number_of_breakpoints() > 0, "must not go negative");
1967 method->decr_number_of_breakpoints(Thread::current());
1968 }
1969
1970 #endif // INCLUDE_JVMTI
1971
1972 // jmethodID handling
1973
1974 // This is a block allocating object, sort of like JNIHandleBlock, only a
1975 // lot simpler.
1976 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1977 // never get rid of it.
1978
1979 static const int min_block_size = 8;
1980
1981 class JNIMethodBlockNode : public CHeapObj<mtClass> {
1982 friend class JNIMethodBlock;
1983 Method** _methods;
1984 int _number_of_methods;
1985 int _top;
1986 JNIMethodBlockNode* _next;
1987
1988 public:
1989
1990 JNIMethodBlockNode(int num_methods = min_block_size);
1991
1992 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
1993
1994 void ensure_methods(int num_addl_methods) {
1995 if (_top < _number_of_methods) {
1996 num_addl_methods -= _number_of_methods - _top;
1997 if (num_addl_methods <= 0) {
1998 return;
1999 }
2000 }
2001 if (_next == NULL) {
2002 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2003 } else {
2004 _next->ensure_methods(num_addl_methods);
2005 }
2006 }
2007 };
2008
2009 class JNIMethodBlock : public CHeapObj<mtClass> {
2010 JNIMethodBlockNode _head;
2011 JNIMethodBlockNode *_last_free;
2012 public:
2013 static Method* const _free_method;
2014
2015 JNIMethodBlock(int initial_capacity = min_block_size)
2016 : _head(initial_capacity), _last_free(&_head) {}
2017
2018 void ensure_methods(int num_addl_methods) {
2019 _last_free->ensure_methods(num_addl_methods);
2020 }
2021
2022 Method** add_method(Method* m) {
2023 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) {
2024 if (b->_top < b->_number_of_methods) {
2025 // top points to the next free entry.
2026 int i = b->_top;
2027 b->_methods[i] = m;
2028 b->_top++;
2029 _last_free = b;
2030 return &(b->_methods[i]);
2031 } else if (b->_top == b->_number_of_methods) {
2032 // if the next free entry ran off the block see if there's a free entry
2033 for (int i = 0; i < b->_number_of_methods; i++) {
2034 if (b->_methods[i] == _free_method) {
2035 b->_methods[i] = m;
2036 _last_free = b;
2037 return &(b->_methods[i]);
2038 }
2039 }
2040 // Only check each block once for frees. They're very unlikely.
2041 // Increment top past the end of the block.
2042 b->_top++;
2043 }
2044 // need to allocate a next block.
2045 if (b->_next == NULL) {
2046 b->_next = _last_free = new JNIMethodBlockNode();
2047 }
2048 }
2049 guarantee(false, "Should always allocate a free block");
2050 return NULL;
2051 }
2052
2053 bool contains(Method** m) {
2054 if (m == NULL) return false;
2055 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2056 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2057 // This is a bit of extra checking, for two reasons. One is
2058 // that contains() deals with pointers that are passed in by
2059 // JNI code, so making sure that the pointer is aligned
2060 // correctly is valuable. The other is that <= and > are
2061 // technically not defined on pointers, so the if guard can
2062 // pass spuriously; no modern compiler is likely to make that
2063 // a problem, though (and if one did, the guard could also
2064 // fail spuriously, which would be bad).
2065 ptrdiff_t idx = m - b->_methods;
2066 if (b->_methods + idx == m) {
2067 return true;
2068 }
2069 }
2070 }
2071 return false; // not found
2072 }
2073
2074 // Doesn't really destroy it, just marks it as free so it can be reused.
2075 void destroy_method(Method** m) {
2076 #ifdef ASSERT
2077 assert(contains(m), "should be a methodID");
2078 #endif // ASSERT
2079 *m = _free_method;
2080 }
2081
2082 // During class unloading the methods are cleared, which is different
2083 // than freed.
2084 void clear_all_methods() {
2085 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2086 for (int i = 0; i< b->_number_of_methods; i++) {
2087 b->_methods[i] = NULL;
2088 }
2089 }
2090 }
2091 #ifndef PRODUCT
2092 int count_methods() {
2093 // count all allocated methods
2094 int count = 0;
2095 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2096 for (int i = 0; i< b->_number_of_methods; i++) {
2097 if (b->_methods[i] != _free_method) count++;
2098 }
2099 }
2100 return count;
2101 }
2102 #endif // PRODUCT
2103 };
2104
2105 // Something that can't be mistaken for an address or a markOop
2106 Method* const JNIMethodBlock::_free_method = (Method*)55;
2107
2108 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(NULL) {
2109 _number_of_methods = MAX2(num_methods, min_block_size);
2110 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2111 for (int i = 0; i < _number_of_methods; i++) {
2112 _methods[i] = JNIMethodBlock::_free_method;
2113 }
2114 }
2115
2116 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
2117 ClassLoaderData* cld = loader_data;
2118 if (!SafepointSynchronize::is_at_safepoint()) {
2119 // Have to add jmethod_ids() to class loader data thread-safely.
2120 // Also have to add the method to the list safely, which the cld lock
2121 // protects as well.
2122 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2123 if (cld->jmethod_ids() == NULL) {
2124 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2125 } else {
2126 cld->jmethod_ids()->ensure_methods(capacity);
2127 }
2128 } else {
2129 // At safepoint, we are single threaded and can set this.
2130 if (cld->jmethod_ids() == NULL) {
2131 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2132 } else {
2133 cld->jmethod_ids()->ensure_methods(capacity);
2134 }
2135 }
2136 }
2137
2138 // Add a method id to the jmethod_ids
2139 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
2140 ClassLoaderData* cld = loader_data;
2141
2142 if (!SafepointSynchronize::is_at_safepoint()) {
2143 // Have to add jmethod_ids() to class loader data thread-safely.
2144 // Also have to add the method to the list safely, which the cld lock
2145 // protects as well.
2146 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2147 if (cld->jmethod_ids() == NULL) {
2148 cld->set_jmethod_ids(new JNIMethodBlock());
2149 }
2150 // jmethodID is a pointer to Method*
2151 return (jmethodID)cld->jmethod_ids()->add_method(m);
2152 } else {
2153 // At safepoint, we are single threaded and can set this.
2154 if (cld->jmethod_ids() == NULL) {
2155 cld->set_jmethod_ids(new JNIMethodBlock());
2156 }
2157 // jmethodID is a pointer to Method*
2158 return (jmethodID)cld->jmethod_ids()->add_method(m);
2159 }
2160 }
2161
2162 // Mark a jmethodID as free. This is called when there is a data race in
2163 // InstanceKlass while creating the jmethodID cache.
2164 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
2165 ClassLoaderData* cld = loader_data;
2166 Method** ptr = (Method**)m;
2167 assert(cld->jmethod_ids() != NULL, "should have method handles");
2168 cld->jmethod_ids()->destroy_method(ptr);
2169 }
2170
2171 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2172 // Can't assert the method_holder is the same because the new method has the
2173 // scratch method holder.
2174 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2175 == new_method->method_holder()->class_loader() ||
2176 new_method->method_holder()->class_loader() == NULL, // allow Unsafe substitution
2177 "changing to a different class loader");
2178 // Just change the method in place, jmethodID pointer doesn't change.
2179 *((Method**)jmid) = new_method;
2180 }
2181
2182 bool Method::is_method_id(jmethodID mid) {
2183 Method* m = resolve_jmethod_id(mid);
2184 assert(m != NULL, "should be called with non-null method");
2185 InstanceKlass* ik = m->method_holder();
2186 ClassLoaderData* cld = ik->class_loader_data();
2187 if (cld->jmethod_ids() == NULL) return false;
2188 return (cld->jmethod_ids()->contains((Method**)mid));
2189 }
2190
2191 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2192 if (mid == NULL) return NULL;
2193 Method* o = resolve_jmethod_id(mid);
2194 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
2195 return NULL;
2196 }
2197 return o;
2198 };
2199
2200 void Method::set_on_stack(const bool value) {
2201 // Set both the method itself and its constant pool. The constant pool
2202 // on stack means some method referring to it is also on the stack.
2203 constants()->set_on_stack(value);
2204
2205 bool already_set = on_stack();
2206 _access_flags.set_on_stack(value);
2207 if (value && !already_set) {
2208 MetadataOnStackMark::record(this);
2209 }
2210 assert(!value || !is_old() || is_obsolete() || is_running_emcp(),
2211 "emcp methods cannot run after emcp bit is cleared");
2212 }
2213
2214 // Called when the class loader is unloaded to make all methods weak.
2215 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2216 loader_data->jmethod_ids()->clear_all_methods();
2217 }
2218
2219 bool Method::has_method_vptr(const void* ptr) {
2220 Method m;
2221 // This assumes that the vtbl pointer is the first word of a C++ object.
2222 return dereference_vptr(&m) == dereference_vptr(ptr);
2223 }
2224
2225 // Check that this pointer is valid by checking that the vtbl pointer matches
2226 bool Method::is_valid_method(const Method* m) {
2227 if (m == NULL) {
2228 return false;
2229 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2230 // Quick sanity check on pointer.
2231 return false;
2232 } else if (m->is_shared()) {
2233 return MetaspaceShared::is_valid_shared_method(m);
2234 } else if (Metaspace::contains_non_shared(m)) {
2235 return has_method_vptr((const void*)m);
2236 } else {
2237 return false;
2238 }
2239 }
2240
2241 #ifndef PRODUCT
2242 void Method::print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) {
2243 out->print(" jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
2244 }
2245 #endif // PRODUCT
2246
2247
2248 // Printing
2249
2250 #ifndef PRODUCT
2251
2252 void Method::print_on(outputStream* st) const {
2253 ResourceMark rm;
2254 assert(is_method(), "must be method");
2255 st->print_cr("%s", internal_name());
2256 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this));
2257 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2258 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants()));
2259 constants()->print_value_on(st); st->cr();
2260 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2261 st->print (" - name: "); name()->print_value_on(st); st->cr();
2262 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2263 st->print_cr(" - max stack: %d", max_stack());
2264 st->print_cr(" - max locals: %d", max_locals());
2265 st->print_cr(" - size of params: %d", size_of_parameters());
2266 st->print_cr(" - method size: %d", method_size());
2267 if (intrinsic_id() != vmIntrinsics::_none)
2268 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
2269 if (highest_comp_level() != CompLevel_none)
2270 st->print_cr(" - highest level: %d", highest_comp_level());
2271 st->print_cr(" - vtable index: %d", _vtable_index);
2272 if (valid_itable_index())
2273 st->print_cr(" - itable index: %d", itable_index());
2274 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry()));
2275 st->print( " - adapters: ");
2276 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2277 if (a == NULL)
2278 st->print_cr(INTPTR_FORMAT, p2i(a));
2279 else
2280 a->print_adapter_on(st);
2281 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry()));
2282 st->print_cr(" - code size: %d", code_size());
2283 if (code_size() != 0) {
2284 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base()));
2285 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size()));
2286 }
2287 if (method_data() != NULL) {
2288 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data()));
2289 }
2290 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2291 if (checked_exceptions_length() > 0) {
2292 CheckedExceptionElement* table = checked_exceptions_start();
2293 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table));
2294 if (Verbose) {
2295 for (int i = 0; i < checked_exceptions_length(); i++) {
2296 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2297 }
2298 }
2299 }
2300 if (has_linenumber_table()) {
2301 u_char* table = compressed_linenumber_table();
2302 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table));
2303 if (Verbose) {
2304 CompressedLineNumberReadStream stream(table);
2305 while (stream.read_pair()) {
2306 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2307 }
2308 }
2309 }
2310 st->print_cr(" - localvar length: %d", localvariable_table_length());
2311 if (localvariable_table_length() > 0) {
2312 LocalVariableTableElement* table = localvariable_table_start();
2313 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table));
2314 if (Verbose) {
2315 for (int i = 0; i < localvariable_table_length(); i++) {
2316 int bci = table[i].start_bci;
2317 int len = table[i].length;
2318 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2319 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2320 int slot = table[i].slot;
2321 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2322 }
2323 }
2324 }
2325 if (code() != NULL) {
2326 st->print (" - compiled code: ");
2327 code()->print_value_on(st);
2328 }
2329 if (is_native()) {
2330 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function()));
2331 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler()));
2332 }
2333 }
2334
2335 void Method::print_linkage_flags(outputStream* st) {
2336 access_flags().print_on(st);
2337 if (is_default_method()) {
2338 st->print("default ");
2339 }
2340 if (is_overpass()) {
2341 st->print("overpass ");
2342 }
2343 }
2344 #endif //PRODUCT
2345
2346 void Method::print_value_on(outputStream* st) const {
2347 assert(is_method(), "must be method");
2348 st->print("%s", internal_name());
2349 print_address_on(st);
2350 st->print(" ");
2351 if (WizardMode) access_flags().print_on(st);
2352 name()->print_value_on(st);
2353 st->print(" ");
2354 signature()->print_value_on(st);
2355 st->print(" in ");
2356 method_holder()->print_value_on(st);
2357 if (WizardMode) st->print("#%d", _vtable_index);
2358 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2359 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2360 }
2361
2362 #if INCLUDE_SERVICES
2363 // Size Statistics
2364 void Method::collect_statistics(KlassSizeStats *sz) const {
2365 int mysize = sz->count(this);
2366 sz->_method_bytes += mysize;
2367 sz->_method_all_bytes += mysize;
2368 sz->_rw_bytes += mysize;
2369
2370 if (constMethod()) {
2371 constMethod()->collect_statistics(sz);
2372 }
2373 if (method_data()) {
2374 method_data()->collect_statistics(sz);
2375 }
2376 }
2377 #endif // INCLUDE_SERVICES
2378
2379 // LogTouchedMethods and PrintTouchedMethods
2380
2381 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because
2382 // the Method may be garbage collected. Let's roll our own hash table.
2383 class TouchedMethodRecord : CHeapObj<mtTracing> {
2384 public:
2385 // It's OK to store Symbols here because they will NOT be GC'ed if
2386 // LogTouchedMethods is enabled.
2387 TouchedMethodRecord* _next;
2388 Symbol* _class_name;
2389 Symbol* _method_name;
2390 Symbol* _method_signature;
2391 };
2392
2393 static const int TOUCHED_METHOD_TABLE_SIZE = 20011;
2394 static TouchedMethodRecord** _touched_method_table = NULL;
2395
2396 void Method::log_touched(TRAPS) {
2397
2398 const int table_size = TOUCHED_METHOD_TABLE_SIZE;
2399 Symbol* my_class = klass_name();
2400 Symbol* my_name = name();
2401 Symbol* my_sig = signature();
2402
2403 unsigned int hash = my_class->identity_hash() +
2404 my_name->identity_hash() +
2405 my_sig->identity_hash();
2406 juint index = juint(hash) % table_size;
2407
2408 MutexLocker ml(TouchedMethodLog_lock, THREAD);
2409 if (_touched_method_table == NULL) {
2410 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size,
2411 mtTracing, CURRENT_PC);
2412 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size);
2413 }
2414
2415 TouchedMethodRecord* ptr = _touched_method_table[index];
2416 while (ptr) {
2417 if (ptr->_class_name == my_class &&
2418 ptr->_method_name == my_name &&
2419 ptr->_method_signature == my_sig) {
2420 return;
2421 }
2422 if (ptr->_next == NULL) break;
2423 ptr = ptr->_next;
2424 }
2425 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing);
2426 my_class->increment_refcount();
2427 my_name->increment_refcount();
2428 my_sig->increment_refcount();
2429 nptr->_class_name = my_class;
2430 nptr->_method_name = my_name;
2431 nptr->_method_signature = my_sig;
2432 nptr->_next = NULL;
2433
2434 if (ptr == NULL) {
2435 // first
2436 _touched_method_table[index] = nptr;
2437 } else {
2438 ptr->_next = nptr;
2439 }
2440 }
2441
2442 void Method::print_touched_methods(outputStream* out) {
2443 MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock);
2444 out->print_cr("# Method::print_touched_methods version 1");
2445 if (_touched_method_table) {
2446 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) {
2447 TouchedMethodRecord* ptr = _touched_method_table[i];
2448 while(ptr) {
2449 ptr->_class_name->print_symbol_on(out); out->print(".");
2450 ptr->_method_name->print_symbol_on(out); out->print(":");
2451 ptr->_method_signature->print_symbol_on(out); out->cr();
2452 ptr = ptr->_next;
2453 }
2454 }
2455 }
2456 }
2457
2458 // Verification
2459
2460 void Method::verify_on(outputStream* st) {
2461 guarantee(is_method(), "object must be method");
2462 guarantee(constants()->is_constantPool(), "should be constant pool");
2463 MethodData* md = method_data();
2464 guarantee(md == NULL ||
2465 md->is_methodData(), "should be method data");
2466 }