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_initializer() const {
701 return is_object_initializer() || is_static_initializer();
702 }
703
704 bool Method::has_valid_initializer_flags() const {
705 return (is_static() ||
706 method_holder()->major_version() < 51);
707 }
708
709 bool Method::is_static_initializer() const {
710 // For classfiles version 51 or greater, ensure that the clinit method is
711 // static. Non-static methods with the name "<clinit>" are not static
712 // initializers. (older classfiles exempted for backward compatibility)
713 return name() == vmSymbols::class_initializer_name() &&
714 has_valid_initializer_flags();
715 }
716
717 bool Method::is_object_initializer() const {
718 return name() == vmSymbols::object_initializer_name();
719 }
720
721 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
722 int length = method->checked_exceptions_length();
723 if (length == 0) { // common case
724 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
725 } else {
726 methodHandle h_this(THREAD, method);
727 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
728 objArrayHandle mirrors (THREAD, m_oop);
729 for (int i = 0; i < length; i++) {
730 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
731 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
732 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
733 mirrors->obj_at_put(i, k->java_mirror());
734 }
735 return mirrors;
736 }
737 };
738
739
740 int Method::line_number_from_bci(int bci) const {
741 int best_bci = 0;
742 int best_line = -1;
743 if (bci == SynchronizationEntryBCI) bci = 0;
744 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
745 // The line numbers are a short array of 2-tuples [start_pc, line_number].
746 // Not necessarily sorted and not necessarily one-to-one.
747 CompressedLineNumberReadStream stream(compressed_linenumber_table());
748 while (stream.read_pair()) {
749 if (stream.bci() == bci) {
750 // perfect match
751 return stream.line();
752 } else {
753 // update best_bci/line
754 if (stream.bci() < bci && stream.bci() >= best_bci) {
755 best_bci = stream.bci();
756 best_line = stream.line();
757 }
758 }
759 }
760 }
761 return best_line;
762 }
763
764
765 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
766 if( constants()->tag_at(klass_index).is_unresolved_klass()) {
767 Thread *thread = Thread::current();
768 Symbol* klass_name = constants()->klass_name_at(klass_index);
769 Handle loader(thread, method_holder()->class_loader());
770 Handle prot (thread, method_holder()->protection_domain());
771 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
772 } else {
773 return true;
774 }
775 }
776
777
778 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
779 int klass_index = constants()->klass_ref_index_at(refinfo_index);
780 if (must_be_resolved) {
781 // Make sure klass is resolved in constantpool.
782 if (constants()->tag_at(klass_index).is_unresolved_klass()) {
783 return false;
784 }
785 }
786 return is_klass_loaded_by_klass_index(klass_index);
787 }
788
789
790 void Method::set_native_function(address function, bool post_event_flag) {
791 assert(function != NULL, "use clear_native_function to unregister natives");
792 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
793 address* native_function = native_function_addr();
794
795 // We can see racers trying to place the same native function into place. Once
796 // is plenty.
797 address current = *native_function;
798 if (current == function) return;
799 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
800 function != NULL) {
801 // native_method_throw_unsatisfied_link_error_entry() should only
802 // be passed when post_event_flag is false.
803 assert(function !=
804 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
805 "post_event_flag mis-match");
806
807 // post the bind event, and possible change the bind function
808 JvmtiExport::post_native_method_bind(this, &function);
809 }
810 *native_function = function;
811 // This function can be called more than once. We must make sure that we always
812 // use the latest registered method -> check if a stub already has been generated.
813 // If so, we have to make it not_entrant.
814 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates
815 if (nm != NULL) {
816 nm->make_not_entrant();
817 }
818 }
819
820
821 bool Method::has_native_function() const {
822 if (is_method_handle_intrinsic())
823 return false; // special-cased in SharedRuntime::generate_native_wrapper
824 address func = native_function();
825 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
826 }
827
828
829 void Method::clear_native_function() {
830 // Note: is_method_handle_intrinsic() is allowed here.
831 set_native_function(
832 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
833 !native_bind_event_is_interesting);
834 clear_code();
835 }
836
837 address Method::critical_native_function() {
838 methodHandle mh(this);
839 return NativeLookup::lookup_critical_entry(mh);
840 }
841
842
843 void Method::set_signature_handler(address handler) {
844 address* signature_handler = signature_handler_addr();
845 *signature_handler = handler;
846 }
847
848
849 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
850 if (PrintCompilation && report) {
851 ttyLocker ttyl;
852 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
853 if (comp_level == CompLevel_all) {
854 tty->print("all levels ");
855 } else {
856 tty->print("levels ");
857 for (int i = (int)CompLevel_none; i <= comp_level; i++) {
858 tty->print("%d ", i);
859 }
860 }
861 this->print_short_name(tty);
862 int size = this->code_size();
863 if (size > 0) {
864 tty->print(" (%d bytes)", size);
865 }
866 if (reason != NULL) {
867 tty->print(" %s", reason);
868 }
869 tty->cr();
870 }
871 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
872 ttyLocker ttyl;
873 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
874 os::current_thread_id(), is_osr, comp_level);
875 if (reason != NULL) {
876 xtty->print(" reason=\'%s\'", reason);
877 }
878 xtty->method(this);
879 xtty->stamp();
880 xtty->end_elem();
881 }
882 }
883
884 bool Method::is_always_compilable() const {
885 // Generated adapters must be compiled
886 if (is_method_handle_intrinsic() && is_synthetic()) {
887 assert(!is_not_c1_compilable(), "sanity check");
888 assert(!is_not_c2_compilable(), "sanity check");
889 return true;
890 }
891
892 return false;
893 }
894
895 bool Method::is_not_compilable(int comp_level) const {
896 if (number_of_breakpoints() > 0)
897 return true;
898 if (is_always_compilable())
899 return false;
900 if (comp_level == CompLevel_any)
901 return is_not_c1_compilable() || is_not_c2_compilable();
902 if (is_c1_compile(comp_level))
903 return is_not_c1_compilable();
904 if (is_c2_compile(comp_level))
905 return is_not_c2_compilable();
906 return false;
907 }
908
909 // call this when compiler finds that this method is not compilable
910 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
911 if (is_always_compilable()) {
912 // Don't mark a method which should be always compilable
913 return;
914 }
915 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
916 if (comp_level == CompLevel_all) {
917 set_not_c1_compilable();
918 set_not_c2_compilable();
919 } else {
920 if (is_c1_compile(comp_level))
921 set_not_c1_compilable();
922 if (is_c2_compile(comp_level))
923 set_not_c2_compilable();
924 }
925 CompilationPolicy::policy()->disable_compilation(this);
926 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
927 }
928
929 bool Method::is_not_osr_compilable(int comp_level) const {
930 if (is_not_compilable(comp_level))
931 return true;
932 if (comp_level == CompLevel_any)
933 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
934 if (is_c1_compile(comp_level))
935 return is_not_c1_osr_compilable();
936 if (is_c2_compile(comp_level))
937 return is_not_c2_osr_compilable();
938 return false;
939 }
940
941 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
942 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
943 if (comp_level == CompLevel_all) {
944 set_not_c1_osr_compilable();
945 set_not_c2_osr_compilable();
946 } else {
947 if (is_c1_compile(comp_level))
948 set_not_c1_osr_compilable();
949 if (is_c2_compile(comp_level))
950 set_not_c2_osr_compilable();
951 }
952 CompilationPolicy::policy()->disable_compilation(this);
953 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
954 }
955
956 // Revert to using the interpreter and clear out the nmethod
957 void Method::clear_code(bool acquire_lock /* = true */) {
958 MutexLockerEx pl(acquire_lock ? Patching_lock : NULL, Mutex::_no_safepoint_check_flag);
959 // this may be NULL if c2i adapters have not been made yet
960 // Only should happen at allocate time.
961 if (adapter() == NULL) {
962 _from_compiled_entry = NULL;
963 _from_compiled_value_entry = NULL;
964 _from_compiled_value_ro_entry = NULL;
965 } else {
966 _from_compiled_entry = adapter()->get_c2i_entry();
967 _from_compiled_value_entry = adapter()->get_c2i_value_entry();
968 _from_compiled_value_ro_entry = adapter()->get_c2i_value_ro_entry();
969 }
970 OrderAccess::storestore();
971 _from_interpreted_entry = _i2i_entry;
972 OrderAccess::storestore();
973 _code = NULL;
974 }
975
976 #if INCLUDE_CDS
977 // Called by class data sharing to remove any entry points (which are not shared)
978 void Method::unlink_method() {
979 _code = NULL;
980
981 assert(DumpSharedSpaces, "dump time only");
982 // Set the values to what they should be at run time. Note that
983 // this Method can no longer be executed during dump time.
984 _i2i_entry = Interpreter::entry_for_cds_method(this);
985 _from_interpreted_entry = _i2i_entry;
986
987 if (is_native()) {
988 *native_function_addr() = NULL;
989 set_signature_handler(NULL);
990 }
991 NOT_PRODUCT(set_compiled_invocation_count(0);)
992
993 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter();
994 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline());
995 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline();
996 assert(*((int*)_from_compiled_entry) == 0, "must be NULL during dump time, to be initialized at run time");
997 _from_compiled_value_entry = cds_adapter->get_c2i_entry_trampoline();
998 assert(*((int*)_from_compiled_value_entry) == 0, "must be NULL during dump time, to be initialized at run time");
999 _from_compiled_value_ro_entry = cds_adapter->get_c2i_entry_trampoline();
1000 assert(*((int*)_from_compiled_value_ro_entry) == 0, "must be NULL during dump time, to be initialized at run time");
1001
1002 set_method_data(NULL);
1003 clear_method_counters();
1004 }
1005 #endif
1006
1007 /****************************************************************************
1008 // The following illustrates how the entries work for CDS shared Methods:
1009 //
1010 // Our goal is to delay writing into a shared Method until it's compiled.
1011 // Hence, we want to determine the initial values for _i2i_entry,
1012 // _from_interpreted_entry and _from_compiled_entry during CDS dump time.
1013 //
1014 // In this example, both Methods A and B have the _i2i_entry of "zero_locals".
1015 // They also have similar signatures so that they will share the same
1016 // AdapterHandlerEntry.
1017 //
1018 // _adapter_trampoline points to a fixed location in the RW section of
1019 // the CDS archive. This location initially contains a NULL pointer. When the
1020 // first of method A or B is linked, an AdapterHandlerEntry is allocated
1021 // dynamically, and its c2i/i2c entries are generated.
1022 //
1023 // _i2i_entry and _from_interpreted_entry initially points to the same
1024 // (fixed) location in the CODE section of the CDS archive. This contains
1025 // an unconditional branch to the actual entry for "zero_locals", which is
1026 // generated at run time and may be on an arbitrary address. Thus, the
1027 // unconditional branch is also generated at run time to jump to the correct
1028 // address.
1029 //
1030 // Similarly, _from_compiled_entry points to a fixed address in the CODE
1031 // section. This address has enough space for an unconditional branch
1032 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is
1033 // initialized, and the address for the actual c2i_entry is known, we emit a
1034 // branch instruction here to branch to the actual c2i_entry.
1035 //
1036 // The effect of the extra branch on the i2i and c2i entries is negligible.
1037 //
1038 // The reason for putting _adapter_trampoline in RO is many shared Methods
1039 // share the same AdapterHandlerEntry, so we can save space in the RW section
1040 // by having the extra indirection.
1041
1042
1043 [Method A: RW]
1044 _constMethod ----> [ConstMethod: RO]
1045 _adapter_trampoline -----------+
1046 |
1047 _i2i_entry (same value as method B) |
1048 _from_interpreted_entry (same value as method B) |
1049 _from_compiled_entry (same value as method B) |
1050 |
1051 |
1052 [Method B: RW] +--------+
1053 _constMethod ----> [ConstMethod: RO] |
1054 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+
1055 |
1056 +-------------------------------+
1057 |
1058 +----> [AdapterHandlerEntry] (allocated at run time)
1059 _fingerprint
1060 _c2i_entry ---------------------------------+->[c2i entry..]
1061 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] |
1062 _from_interpreted_entry | _c2i_unverified_entry | |
1063 | | | |
1064 | | (_cds_entry_table: CODE) | |
1065 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | |
1066 | | (allocated at run time) | |
1067 | | ... [asm code ...] | |
1068 +-[not compiled]-+ [n]: jmp _entry_table[n] | |
1069 | | |
1070 | | |
1071 +-[compiled]-------------------------------------------------------------------+ |
1072 |
1073 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) |
1074 [jmp c2i_entry] ------------------------------------------------------+
1075
1076 ***/
1077
1078 // Called when the method_holder is getting linked. Setup entrypoints so the method
1079 // is ready to be called from interpreter, compiler, and vtables.
1080 void Method::link_method(const methodHandle& h_method, TRAPS) {
1081 // If the code cache is full, we may reenter this function for the
1082 // leftover methods that weren't linked.
1083 if (is_shared()) {
1084 address entry = Interpreter::entry_for_cds_method(h_method);
1085 assert(entry != NULL && entry == _i2i_entry,
1086 "should be correctly set during dump time");
1087 if (adapter() != NULL) {
1088 return;
1089 }
1090 assert(entry == _from_interpreted_entry,
1091 "should be correctly set during dump time");
1092 } else if (_i2i_entry != NULL) {
1093 return;
1094 }
1095 assert( _code == NULL, "nothing compiled yet" );
1096
1097 // Setup interpreter entrypoint
1098 assert(this == h_method(), "wrong h_method()" );
1099
1100 if (!is_shared()) {
1101 assert(adapter() == NULL, "init'd to NULL");
1102 address entry = Interpreter::entry_for_method(h_method);
1103 assert(entry != NULL, "interpreter entry must be non-null");
1104 // Sets both _i2i_entry and _from_interpreted_entry
1105 set_interpreter_entry(entry);
1106 }
1107
1108 // Don't overwrite already registered native entries.
1109 if (is_native() && !has_native_function()) {
1110 set_native_function(
1111 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1112 !native_bind_event_is_interesting);
1113 }
1114
1115 // Setup compiler entrypoint. This is made eagerly, so we do not need
1116 // special handling of vtables. An alternative is to make adapters more
1117 // lazily by calling make_adapter() from from_compiled_entry() for the
1118 // normal calls. For vtable calls life gets more complicated. When a
1119 // call-site goes mega-morphic we need adapters in all methods which can be
1120 // called from the vtable. We need adapters on such methods that get loaded
1121 // later. Ditto for mega-morphic itable calls. If this proves to be a
1122 // problem we'll make these lazily later.
1123 (void) make_adapters(h_method, CHECK);
1124
1125 // ONLY USE the h_method now as make_adapter may have blocked
1126
1127 }
1128
1129 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1130 // Adapters for compiled code are made eagerly here. They are fairly
1131 // small (generally < 100 bytes) and quick to make (and cached and shared)
1132 // so making them eagerly shouldn't be too expensive.
1133 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1134 if (adapter == NULL ) {
1135 if (!is_init_completed()) {
1136 // Don't throw exceptions during VM initialization because java.lang.* classes
1137 // might not have been initialized, causing problems when constructing the
1138 // Java exception object.
1139 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1140 } else {
1141 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1142 }
1143 }
1144
1145 if (mh->is_shared()) {
1146 assert(mh->adapter() == adapter, "must be");
1147 assert(mh->_from_compiled_entry != NULL, "must be");
1148 assert(mh->_from_compiled_value_entry != NULL, "must be");
1149 assert(mh->_from_compiled_value_ro_entry != NULL, "must be");
1150 } else {
1151 mh->set_adapter_entry(adapter);
1152 mh->_from_compiled_entry = adapter->get_c2i_entry();
1153 mh->_from_compiled_value_entry = adapter->get_c2i_value_entry();
1154 mh->_from_compiled_value_ro_entry = adapter->get_c2i_value_ro_entry();
1155 }
1156 return adapter->get_c2i_entry();
1157 }
1158
1159 void Method::restore_unshareable_info(TRAPS) {
1160 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
1161
1162 // Since restore_unshareable_info can be called more than once for a method, don't
1163 // redo any work.
1164 if (adapter() == NULL) {
1165 methodHandle mh(THREAD, this);
1166 link_method(mh, CHECK);
1167 }
1168 }
1169
1170 address Method::from_compiled_entry_no_trampoline() const {
1171 CompiledMethod *code = OrderAccess::load_acquire(&_code);
1172 if (code) {
1173 return code->verified_entry_point();
1174 } else {
1175 return adapter()->get_c2i_entry();
1176 }
1177 }
1178
1179 // The verified_code_entry() must be called when a invoke is resolved
1180 // on this method.
1181
1182 // It returns the compiled code entry point, after asserting not null.
1183 // This function is called after potential safepoints so that nmethod
1184 // or adapter that it points to is still live and valid.
1185 // This function must not hit a safepoint!
1186 address Method::verified_code_entry() {
1187 debug_only(NoSafepointVerifier nsv;)
1188 assert(_from_compiled_entry != NULL, "must be set");
1189 return _from_compiled_entry;
1190 }
1191
1192 address Method::verified_value_code_entry() {
1193 debug_only(NoSafepointVerifier nsv;)
1194 assert(_from_compiled_value_entry != NULL, "must be set");
1195 return _from_compiled_value_entry;
1196 }
1197
1198 address Method::verified_value_ro_code_entry() {
1199 debug_only(NoSafepointVerifier nsv;)
1200 assert(_from_compiled_value_ro_entry != NULL, "must be set");
1201 return _from_compiled_value_ro_entry;
1202 }
1203
1204 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1205 // (could be racing a deopt).
1206 // Not inline to avoid circular ref.
1207 bool Method::check_code() const {
1208 // cached in a register or local. There's a race on the value of the field.
1209 CompiledMethod *code = OrderAccess::load_acquire(&_code);
1210 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
1211 }
1212
1213 // Install compiled code. Instantly it can execute.
1214 void Method::set_code(const methodHandle& mh, CompiledMethod *code) {
1215 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1216 assert( code, "use clear_code to remove code" );
1217 assert( mh->check_code(), "" );
1218
1219 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
1220
1221 // These writes must happen in this order, because the interpreter will
1222 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1223 // which jumps to _from_compiled_entry.
1224 mh->_code = code; // Assign before allowing compiled code to exec
1225
1226 int comp_level = code->comp_level();
1227 // In theory there could be a race here. In practice it is unlikely
1228 // and not worth worrying about.
1229 if (comp_level > mh->highest_comp_level()) {
1230 mh->set_highest_comp_level(comp_level);
1231 }
1232
1233 OrderAccess::storestore();
1234 mh->_from_compiled_entry = code->verified_entry_point();
1235 mh->_from_compiled_value_entry = code->verified_value_entry_point();
1236 mh->_from_compiled_value_ro_entry = code->verified_value_ro_entry_point();
1237 OrderAccess::storestore();
1238 // Instantly compiled code can execute.
1239 if (!mh->is_method_handle_intrinsic())
1240 mh->_from_interpreted_entry = mh->get_i2c_entry();
1241 }
1242
1243
1244 bool Method::is_overridden_in(Klass* k) const {
1245 InstanceKlass* ik = InstanceKlass::cast(k);
1246
1247 if (ik->is_interface()) return false;
1248
1249 // If method is an interface, we skip it - except if it
1250 // is a miranda method
1251 if (method_holder()->is_interface()) {
1252 // Check that method is not a miranda method
1253 if (ik->lookup_method(name(), signature()) == NULL) {
1254 // No implementation exist - so miranda method
1255 return false;
1256 }
1257 return true;
1258 }
1259
1260 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1261 if (!has_vtable_index()) {
1262 return false;
1263 } else {
1264 Method* vt_m = ik->method_at_vtable(vtable_index());
1265 return vt_m != this;
1266 }
1267 }
1268
1269
1270 // give advice about whether this Method* should be cached or not
1271 bool Method::should_not_be_cached() const {
1272 if (is_old()) {
1273 // This method has been redefined. It is either EMCP or obsolete
1274 // and we don't want to cache it because that would pin the method
1275 // down and prevent it from being collectible if and when it
1276 // finishes executing.
1277 return true;
1278 }
1279
1280 // caching this method should be just fine
1281 return false;
1282 }
1283
1284
1285 /**
1286 * Returns true if this is one of the specially treated methods for
1287 * security related stack walks (like Reflection.getCallerClass).
1288 */
1289 bool Method::is_ignored_by_security_stack_walk() const {
1290 if (intrinsic_id() == vmIntrinsics::_invoke) {
1291 // This is Method.invoke() -- ignore it
1292 return true;
1293 }
1294 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1295 // This is an auxilary frame -- ignore it
1296 return true;
1297 }
1298 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1299 // This is an internal adapter frame for method handles -- ignore it
1300 return true;
1301 }
1302 return false;
1303 }
1304
1305
1306 // Constant pool structure for invoke methods:
1307 enum {
1308 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1309 _imcp_invoke_signature, // utf8: (variable Symbol*)
1310 _imcp_limit
1311 };
1312
1313 // Test if this method is an MH adapter frame generated by Java code.
1314 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1315 bool Method::is_compiled_lambda_form() const {
1316 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1317 }
1318
1319 // Test if this method is an internal MH primitive method.
1320 bool Method::is_method_handle_intrinsic() const {
1321 vmIntrinsics::ID iid = intrinsic_id();
1322 return (MethodHandles::is_signature_polymorphic(iid) &&
1323 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1324 }
1325
1326 bool Method::has_member_arg() const {
1327 vmIntrinsics::ID iid = intrinsic_id();
1328 return (MethodHandles::is_signature_polymorphic(iid) &&
1329 MethodHandles::has_member_arg(iid));
1330 }
1331
1332 // Make an instance of a signature-polymorphic internal MH primitive.
1333 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1334 Symbol* signature,
1335 TRAPS) {
1336 ResourceMark rm;
1337 methodHandle empty;
1338
1339 InstanceKlass* holder = SystemDictionary::MethodHandle_klass();
1340 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1341 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1342 if (TraceMethodHandles) {
1343 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1344 }
1345
1346 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1347 name->increment_refcount();
1348 signature->increment_refcount();
1349
1350 int cp_length = _imcp_limit;
1351 ClassLoaderData* loader_data = holder->class_loader_data();
1352 constantPoolHandle cp;
1353 {
1354 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1355 cp = constantPoolHandle(THREAD, cp_oop);
1356 }
1357 cp->set_pool_holder(holder);
1358 cp->symbol_at_put(_imcp_invoke_name, name);
1359 cp->symbol_at_put(_imcp_invoke_signature, signature);
1360 cp->set_has_preresolution();
1361
1362 // decide on access bits: public or not?
1363 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1364 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1365 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1366 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1367
1368 methodHandle m;
1369 {
1370 InlineTableSizes sizes;
1371 Method* m_oop = Method::allocate(loader_data, 0,
1372 accessFlags_from(flags_bits), &sizes,
1373 ConstMethod::NORMAL, CHECK_(empty));
1374 m = methodHandle(THREAD, m_oop);
1375 }
1376 m->set_constants(cp());
1377 m->set_name_index(_imcp_invoke_name);
1378 m->set_signature_index(_imcp_invoke_signature);
1379 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1380 assert(m->signature() == signature, "");
1381 ResultTypeFinder rtf(signature);
1382 m->constMethod()->set_result_type(rtf.type());
1383 m->compute_size_of_parameters(THREAD);
1384 m->init_intrinsic_id();
1385 assert(m->is_method_handle_intrinsic(), "");
1386 #ifdef ASSERT
1387 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1388 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1389 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1390 #endif //ASSERT
1391
1392 // Finally, set up its entry points.
1393 assert(m->can_be_statically_bound(), "");
1394 m->set_vtable_index(Method::nonvirtual_vtable_index);
1395 m->link_method(m, CHECK_(empty));
1396
1397 if (TraceMethodHandles && (Verbose || WizardMode)) {
1398 ttyLocker ttyl;
1399 m->print_on(tty);
1400 }
1401
1402 return m;
1403 }
1404
1405 Klass* Method::check_non_bcp_klass(Klass* klass) {
1406 if (klass != NULL && klass->class_loader() != NULL) {
1407 if (klass->is_objArray_klass())
1408 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1409 return klass;
1410 }
1411 return NULL;
1412 }
1413
1414
1415 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1416 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1417 // Code below does not work for native methods - they should never get rewritten anyway
1418 assert(!m->is_native(), "cannot rewrite native methods");
1419 // Allocate new Method*
1420 AccessFlags flags = m->access_flags();
1421
1422 ConstMethod* cm = m->constMethod();
1423 int checked_exceptions_len = cm->checked_exceptions_length();
1424 int localvariable_len = cm->localvariable_table_length();
1425 int exception_table_len = cm->exception_table_length();
1426 int method_parameters_len = cm->method_parameters_length();
1427 int method_annotations_len = cm->method_annotations_length();
1428 int parameter_annotations_len = cm->parameter_annotations_length();
1429 int type_annotations_len = cm->type_annotations_length();
1430 int default_annotations_len = cm->default_annotations_length();
1431
1432 InlineTableSizes sizes(
1433 localvariable_len,
1434 new_compressed_linenumber_size,
1435 exception_table_len,
1436 checked_exceptions_len,
1437 method_parameters_len,
1438 cm->generic_signature_index(),
1439 method_annotations_len,
1440 parameter_annotations_len,
1441 type_annotations_len,
1442 default_annotations_len,
1443 0);
1444
1445 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1446 Method* newm_oop = Method::allocate(loader_data,
1447 new_code_length,
1448 flags,
1449 &sizes,
1450 m->method_type(),
1451 CHECK_(methodHandle()));
1452 methodHandle newm (THREAD, newm_oop);
1453
1454 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1455 ConstMethod* newcm = newm->constMethod();
1456 int new_const_method_size = newm->constMethod()->size();
1457
1458 // This works because the source and target are both Methods. Some compilers
1459 // (e.g., clang) complain that the target vtable pointer will be stomped,
1460 // so cast away newm()'s and m()'s Methodness.
1461 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1462
1463 // Create shallow copy of ConstMethod.
1464 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1465
1466 // Reset correct method/const method, method size, and parameter info
1467 newm->set_constMethod(newcm);
1468 newm->constMethod()->set_code_size(new_code_length);
1469 newm->constMethod()->set_constMethod_size(new_const_method_size);
1470 assert(newm->code_size() == new_code_length, "check");
1471 assert(newm->method_parameters_length() == method_parameters_len, "check");
1472 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1473 assert(newm->exception_table_length() == exception_table_len, "check");
1474 assert(newm->localvariable_table_length() == localvariable_len, "check");
1475 // Copy new byte codes
1476 memcpy(newm->code_base(), new_code, new_code_length);
1477 // Copy line number table
1478 if (new_compressed_linenumber_size > 0) {
1479 memcpy(newm->compressed_linenumber_table(),
1480 new_compressed_linenumber_table,
1481 new_compressed_linenumber_size);
1482 }
1483 // Copy method_parameters
1484 if (method_parameters_len > 0) {
1485 memcpy(newm->method_parameters_start(),
1486 m->method_parameters_start(),
1487 method_parameters_len * sizeof(MethodParametersElement));
1488 }
1489 // Copy checked_exceptions
1490 if (checked_exceptions_len > 0) {
1491 memcpy(newm->checked_exceptions_start(),
1492 m->checked_exceptions_start(),
1493 checked_exceptions_len * sizeof(CheckedExceptionElement));
1494 }
1495 // Copy exception table
1496 if (exception_table_len > 0) {
1497 memcpy(newm->exception_table_start(),
1498 m->exception_table_start(),
1499 exception_table_len * sizeof(ExceptionTableElement));
1500 }
1501 // Copy local variable number table
1502 if (localvariable_len > 0) {
1503 memcpy(newm->localvariable_table_start(),
1504 m->localvariable_table_start(),
1505 localvariable_len * sizeof(LocalVariableTableElement));
1506 }
1507 // Copy stackmap table
1508 if (m->has_stackmap_table()) {
1509 int code_attribute_length = m->stackmap_data()->length();
1510 Array<u1>* stackmap_data =
1511 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1512 memcpy((void*)stackmap_data->adr_at(0),
1513 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1514 newm->set_stackmap_data(stackmap_data);
1515 }
1516
1517 // copy annotations over to new method
1518 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL);
1519 return newm;
1520 }
1521
1522 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) {
1523 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1524 // because we are not loading from core libraries
1525 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1526 // which does not use the class default class loader so we check for its loader here
1527 const InstanceKlass* ik = InstanceKlass::cast(holder);
1528 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1529 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1530 }
1531
1532 // see if the klass name is well-known:
1533 Symbol* klass_name = ik->name();
1534 return vmSymbols::find_sid(klass_name);
1535 }
1536
1537 void Method::init_intrinsic_id() {
1538 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1539 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1540 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1541 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1542
1543 // the klass name is well-known:
1544 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1545 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1546
1547 // ditto for method and signature:
1548 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1549 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1550 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1551 && name_id == vmSymbols::NO_SID) {
1552 return;
1553 }
1554 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1555 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1556 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1557 && sig_id == vmSymbols::NO_SID) {
1558 return;
1559 }
1560 jshort flags = access_flags().as_short();
1561
1562 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1563 if (id != vmIntrinsics::_none) {
1564 set_intrinsic_id(id);
1565 if (id == vmIntrinsics::_Class_cast) {
1566 // Even if the intrinsic is rejected, we want to inline this simple method.
1567 set_force_inline(true);
1568 }
1569 return;
1570 }
1571
1572 // A few slightly irregular cases:
1573 switch (klass_id) {
1574 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1575 // Second chance: check in regular Math.
1576 switch (name_id) {
1577 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1578 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1579 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1580 // pretend it is the corresponding method in the non-strict class:
1581 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1582 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1583 break;
1584 default:
1585 break;
1586 }
1587 break;
1588
1589 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1590 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1591 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1592 if (!is_native()) break;
1593 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1594 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1595 id = vmIntrinsics::_none;
1596 break;
1597
1598 default:
1599 break;
1600 }
1601
1602 if (id != vmIntrinsics::_none) {
1603 // Set up its iid. It is an alias method.
1604 set_intrinsic_id(id);
1605 return;
1606 }
1607 }
1608
1609 // These two methods are static since a GC may move the Method
1610 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1611 if (!THREAD->can_call_java()) {
1612 // There is nothing useful this routine can do from within the Compile thread.
1613 // Hopefully, the signature contains only well-known classes.
1614 // We could scan for this and return true/false, but the caller won't care.
1615 return false;
1616 }
1617 bool sig_is_loaded = true;
1618 Handle class_loader(THREAD, m->method_holder()->class_loader());
1619 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1620 ResourceMark rm(THREAD);
1621 Symbol* signature = m->signature();
1622 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1623 if (ss.is_object()) {
1624 Symbol* sym = ss.as_symbol(CHECK_(false));
1625 Symbol* name = sym;
1626 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1627 protection_domain, THREAD);
1628 // We are loading classes eagerly. If a ClassNotFoundException or
1629 // a LinkageError was generated, be sure to ignore it.
1630 if (HAS_PENDING_EXCEPTION) {
1631 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1632 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1633 CLEAR_PENDING_EXCEPTION;
1634 } else {
1635 return false;
1636 }
1637 }
1638 if( klass == NULL) { sig_is_loaded = false; }
1639 }
1640 }
1641 return sig_is_loaded;
1642 }
1643
1644 bool Method::has_unloaded_classes_in_signature(const methodHandle& m, TRAPS) {
1645 Handle class_loader(THREAD, m->method_holder()->class_loader());
1646 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1647 ResourceMark rm(THREAD);
1648 Symbol* signature = m->signature();
1649 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1650 if (ss.type() == T_OBJECT) {
1651 Symbol* name = ss.as_symbol_or_null();
1652 if (name == NULL) return true;
1653 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1654 if (klass == NULL) return true;
1655 }
1656 }
1657 return false;
1658 }
1659
1660 // Exposed so field engineers can debug VM
1661 void Method::print_short_name(outputStream* st) {
1662 ResourceMark rm;
1663 #ifdef PRODUCT
1664 st->print(" %s::", method_holder()->external_name());
1665 #else
1666 st->print(" %s::", method_holder()->internal_name());
1667 #endif
1668 name()->print_symbol_on(st);
1669 if (WizardMode) signature()->print_symbol_on(st);
1670 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1671 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1672 }
1673
1674 // Comparer for sorting an object array containing
1675 // Method*s.
1676 static int method_comparator(Method* a, Method* b) {
1677 return a->name()->fast_compare(b->name());
1678 }
1679
1680 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1681 // default_methods also uses this without the ordering for fast find_method
1682 void Method::sort_methods(Array<Method*>* methods, bool set_idnums) {
1683 int length = methods->length();
1684 if (length > 1) {
1685 {
1686 NoSafepointVerifier nsv;
1687 QuickSort::sort(methods->data(), length, method_comparator, /*idempotent=*/false);
1688 }
1689 // Reset method ordering
1690 if (set_idnums) {
1691 for (int i = 0; i < length; i++) {
1692 Method* m = methods->at(i);
1693 m->set_method_idnum(i);
1694 m->set_orig_method_idnum(i);
1695 }
1696 }
1697 }
1698 }
1699
1700 //-----------------------------------------------------------------------------------
1701 // Non-product code unless JVM/TI needs it
1702
1703 #if !defined(PRODUCT) || INCLUDE_JVMTI
1704 class SignatureTypePrinter : public SignatureTypeNames {
1705 private:
1706 outputStream* _st;
1707 bool _use_separator;
1708
1709 void type_name(const char* name) {
1710 if (_use_separator) _st->print(", ");
1711 _st->print("%s", name);
1712 _use_separator = true;
1713 }
1714
1715 public:
1716 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1717 _st = st;
1718 _use_separator = false;
1719 }
1720
1721 void print_parameters() { _use_separator = false; iterate_parameters(); }
1722 void print_returntype() { _use_separator = false; iterate_returntype(); }
1723 };
1724
1725
1726 void Method::print_name(outputStream* st) {
1727 Thread *thread = Thread::current();
1728 ResourceMark rm(thread);
1729 st->print("%s ", is_static() ? "static" : "virtual");
1730 if (WizardMode) {
1731 st->print("%s.", method_holder()->internal_name());
1732 name()->print_symbol_on(st);
1733 signature()->print_symbol_on(st);
1734 } else {
1735 SignatureTypePrinter sig(signature(), st);
1736 sig.print_returntype();
1737 st->print(" %s.", method_holder()->internal_name());
1738 name()->print_symbol_on(st);
1739 st->print("(");
1740 sig.print_parameters();
1741 st->print(")");
1742 }
1743 }
1744 #endif // !PRODUCT || INCLUDE_JVMTI
1745
1746
1747 void Method::print_codes_on(outputStream* st) const {
1748 print_codes_on(0, code_size(), st);
1749 }
1750
1751 void Method::print_codes_on(int from, int to, outputStream* st) const {
1752 Thread *thread = Thread::current();
1753 ResourceMark rm(thread);
1754 methodHandle mh (thread, (Method*)this);
1755 BytecodeStream s(mh);
1756 s.set_interval(from, to);
1757 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1758 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1759 }
1760
1761 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1762 _bci = 0;
1763 _line = 0;
1764 };
1765
1766 bool CompressedLineNumberReadStream::read_pair() {
1767 jubyte next = read_byte();
1768 // Check for terminator
1769 if (next == 0) return false;
1770 if (next == 0xFF) {
1771 // Escape character, regular compression used
1772 _bci += read_signed_int();
1773 _line += read_signed_int();
1774 } else {
1775 // Single byte compression used
1776 _bci += next >> 3;
1777 _line += next & 0x7;
1778 }
1779 return true;
1780 }
1781
1782 #if INCLUDE_JVMTI
1783
1784 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1785 BreakpointInfo* bp = method_holder()->breakpoints();
1786 for (; bp != NULL; bp = bp->next()) {
1787 if (bp->match(this, bci)) {
1788 return bp->orig_bytecode();
1789 }
1790 }
1791 {
1792 ResourceMark rm;
1793 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1794 }
1795 return Bytecodes::_shouldnotreachhere;
1796 }
1797
1798 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1799 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1800 BreakpointInfo* bp = method_holder()->breakpoints();
1801 for (; bp != NULL; bp = bp->next()) {
1802 if (bp->match(this, bci)) {
1803 bp->set_orig_bytecode(code);
1804 // and continue, in case there is more than one
1805 }
1806 }
1807 }
1808
1809 void Method::set_breakpoint(int bci) {
1810 InstanceKlass* ik = method_holder();
1811 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1812 bp->set_next(ik->breakpoints());
1813 ik->set_breakpoints(bp);
1814 // do this last:
1815 bp->set(this);
1816 }
1817
1818 static void clear_matches(Method* m, int bci) {
1819 InstanceKlass* ik = m->method_holder();
1820 BreakpointInfo* prev_bp = NULL;
1821 BreakpointInfo* next_bp;
1822 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1823 next_bp = bp->next();
1824 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1825 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1826 // do this first:
1827 bp->clear(m);
1828 // unhook it
1829 if (prev_bp != NULL)
1830 prev_bp->set_next(next_bp);
1831 else
1832 ik->set_breakpoints(next_bp);
1833 delete bp;
1834 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1835 // at same location. So we have multiple matching (method_index and bci)
1836 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1837 // breakpoint for clear_breakpoint request and keep all other method versions
1838 // BreakpointInfo for future clear_breakpoint request.
1839 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1840 // which is being called when class is unloaded. We delete all the Breakpoint
1841 // information for all versions of method. We may not correctly restore the original
1842 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1843 // so these methods won't be used anymore.
1844 if (bci >= 0) {
1845 break;
1846 }
1847 } else {
1848 // This one is a keeper.
1849 prev_bp = bp;
1850 }
1851 }
1852 }
1853
1854 void Method::clear_breakpoint(int bci) {
1855 assert(bci >= 0, "");
1856 clear_matches(this, bci);
1857 }
1858
1859 void Method::clear_all_breakpoints() {
1860 clear_matches(this, -1);
1861 }
1862
1863 #endif // INCLUDE_JVMTI
1864
1865 int Method::invocation_count() {
1866 MethodCounters *mcs = method_counters();
1867 if (TieredCompilation) {
1868 MethodData* const mdo = method_data();
1869 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1870 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1871 return InvocationCounter::count_limit;
1872 } else {
1873 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1874 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1875 }
1876 } else {
1877 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1878 }
1879 }
1880
1881 int Method::backedge_count() {
1882 MethodCounters *mcs = method_counters();
1883 if (TieredCompilation) {
1884 MethodData* const mdo = method_data();
1885 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1886 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1887 return InvocationCounter::count_limit;
1888 } else {
1889 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1890 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1891 }
1892 } else {
1893 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1894 }
1895 }
1896
1897 int Method::highest_comp_level() const {
1898 const MethodCounters* mcs = method_counters();
1899 if (mcs != NULL) {
1900 return mcs->highest_comp_level();
1901 } else {
1902 return CompLevel_none;
1903 }
1904 }
1905
1906 int Method::highest_osr_comp_level() const {
1907 const MethodCounters* mcs = method_counters();
1908 if (mcs != NULL) {
1909 return mcs->highest_osr_comp_level();
1910 } else {
1911 return CompLevel_none;
1912 }
1913 }
1914
1915 void Method::set_highest_comp_level(int level) {
1916 MethodCounters* mcs = method_counters();
1917 if (mcs != NULL) {
1918 mcs->set_highest_comp_level(level);
1919 }
1920 }
1921
1922 void Method::set_highest_osr_comp_level(int level) {
1923 MethodCounters* mcs = method_counters();
1924 if (mcs != NULL) {
1925 mcs->set_highest_osr_comp_level(level);
1926 }
1927 }
1928
1929 #if INCLUDE_JVMTI
1930
1931 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1932 _bci = bci;
1933 _name_index = m->name_index();
1934 _signature_index = m->signature_index();
1935 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1936 if (_orig_bytecode == Bytecodes::_breakpoint)
1937 _orig_bytecode = m->orig_bytecode_at(_bci);
1938 _next = NULL;
1939 }
1940
1941 void BreakpointInfo::set(Method* method) {
1942 #ifdef ASSERT
1943 {
1944 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1945 if (code == Bytecodes::_breakpoint)
1946 code = method->orig_bytecode_at(_bci);
1947 assert(orig_bytecode() == code, "original bytecode must be the same");
1948 }
1949 #endif
1950 Thread *thread = Thread::current();
1951 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1952 method->incr_number_of_breakpoints(thread);
1953 SystemDictionary::notice_modification();
1954 {
1955 // Deoptimize all dependents on this method
1956 HandleMark hm(thread);
1957 methodHandle mh(thread, method);
1958 CodeCache::flush_dependents_on_method(mh);
1959 }
1960 }
1961
1962 void BreakpointInfo::clear(Method* method) {
1963 *method->bcp_from(_bci) = orig_bytecode();
1964 assert(method->number_of_breakpoints() > 0, "must not go negative");
1965 method->decr_number_of_breakpoints(Thread::current());
1966 }
1967
1968 #endif // INCLUDE_JVMTI
1969
1970 // jmethodID handling
1971
1972 // This is a block allocating object, sort of like JNIHandleBlock, only a
1973 // lot simpler.
1974 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1975 // never get rid of it.
1976
1977 static const int min_block_size = 8;
1978
1979 class JNIMethodBlockNode : public CHeapObj<mtClass> {
1980 friend class JNIMethodBlock;
1981 Method** _methods;
1982 int _number_of_methods;
1983 int _top;
1984 JNIMethodBlockNode* _next;
1985
1986 public:
1987
1988 JNIMethodBlockNode(int num_methods = min_block_size);
1989
1990 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
1991
1992 void ensure_methods(int num_addl_methods) {
1993 if (_top < _number_of_methods) {
1994 num_addl_methods -= _number_of_methods - _top;
1995 if (num_addl_methods <= 0) {
1996 return;
1997 }
1998 }
1999 if (_next == NULL) {
2000 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2001 } else {
2002 _next->ensure_methods(num_addl_methods);
2003 }
2004 }
2005 };
2006
2007 class JNIMethodBlock : public CHeapObj<mtClass> {
2008 JNIMethodBlockNode _head;
2009 JNIMethodBlockNode *_last_free;
2010 public:
2011 static Method* const _free_method;
2012
2013 JNIMethodBlock(int initial_capacity = min_block_size)
2014 : _head(initial_capacity), _last_free(&_head) {}
2015
2016 void ensure_methods(int num_addl_methods) {
2017 _last_free->ensure_methods(num_addl_methods);
2018 }
2019
2020 Method** add_method(Method* m) {
2021 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) {
2022 if (b->_top < b->_number_of_methods) {
2023 // top points to the next free entry.
2024 int i = b->_top;
2025 b->_methods[i] = m;
2026 b->_top++;
2027 _last_free = b;
2028 return &(b->_methods[i]);
2029 } else if (b->_top == b->_number_of_methods) {
2030 // if the next free entry ran off the block see if there's a free entry
2031 for (int i = 0; i < b->_number_of_methods; i++) {
2032 if (b->_methods[i] == _free_method) {
2033 b->_methods[i] = m;
2034 _last_free = b;
2035 return &(b->_methods[i]);
2036 }
2037 }
2038 // Only check each block once for frees. They're very unlikely.
2039 // Increment top past the end of the block.
2040 b->_top++;
2041 }
2042 // need to allocate a next block.
2043 if (b->_next == NULL) {
2044 b->_next = _last_free = new JNIMethodBlockNode();
2045 }
2046 }
2047 guarantee(false, "Should always allocate a free block");
2048 return NULL;
2049 }
2050
2051 bool contains(Method** m) {
2052 if (m == NULL) return false;
2053 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2054 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2055 // This is a bit of extra checking, for two reasons. One is
2056 // that contains() deals with pointers that are passed in by
2057 // JNI code, so making sure that the pointer is aligned
2058 // correctly is valuable. The other is that <= and > are
2059 // technically not defined on pointers, so the if guard can
2060 // pass spuriously; no modern compiler is likely to make that
2061 // a problem, though (and if one did, the guard could also
2062 // fail spuriously, which would be bad).
2063 ptrdiff_t idx = m - b->_methods;
2064 if (b->_methods + idx == m) {
2065 return true;
2066 }
2067 }
2068 }
2069 return false; // not found
2070 }
2071
2072 // Doesn't really destroy it, just marks it as free so it can be reused.
2073 void destroy_method(Method** m) {
2074 #ifdef ASSERT
2075 assert(contains(m), "should be a methodID");
2076 #endif // ASSERT
2077 *m = _free_method;
2078 }
2079
2080 // During class unloading the methods are cleared, which is different
2081 // than freed.
2082 void clear_all_methods() {
2083 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2084 for (int i = 0; i< b->_number_of_methods; i++) {
2085 b->_methods[i] = NULL;
2086 }
2087 }
2088 }
2089 #ifndef PRODUCT
2090 int count_methods() {
2091 // count all allocated methods
2092 int count = 0;
2093 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2094 for (int i = 0; i< b->_number_of_methods; i++) {
2095 if (b->_methods[i] != _free_method) count++;
2096 }
2097 }
2098 return count;
2099 }
2100 #endif // PRODUCT
2101 };
2102
2103 // Something that can't be mistaken for an address or a markOop
2104 Method* const JNIMethodBlock::_free_method = (Method*)55;
2105
2106 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(NULL) {
2107 _number_of_methods = MAX2(num_methods, min_block_size);
2108 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2109 for (int i = 0; i < _number_of_methods; i++) {
2110 _methods[i] = JNIMethodBlock::_free_method;
2111 }
2112 }
2113
2114 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
2115 ClassLoaderData* cld = loader_data;
2116 if (!SafepointSynchronize::is_at_safepoint()) {
2117 // Have to add jmethod_ids() to class loader data thread-safely.
2118 // Also have to add the method to the list safely, which the cld lock
2119 // protects as well.
2120 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2121 if (cld->jmethod_ids() == NULL) {
2122 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2123 } else {
2124 cld->jmethod_ids()->ensure_methods(capacity);
2125 }
2126 } else {
2127 // At safepoint, we are single threaded and can set this.
2128 if (cld->jmethod_ids() == NULL) {
2129 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2130 } else {
2131 cld->jmethod_ids()->ensure_methods(capacity);
2132 }
2133 }
2134 }
2135
2136 // Add a method id to the jmethod_ids
2137 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
2138 ClassLoaderData* cld = loader_data;
2139
2140 if (!SafepointSynchronize::is_at_safepoint()) {
2141 // Have to add jmethod_ids() to class loader data thread-safely.
2142 // Also have to add the method to the list safely, which the cld lock
2143 // protects as well.
2144 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2145 if (cld->jmethod_ids() == NULL) {
2146 cld->set_jmethod_ids(new JNIMethodBlock());
2147 }
2148 // jmethodID is a pointer to Method*
2149 return (jmethodID)cld->jmethod_ids()->add_method(m);
2150 } else {
2151 // At safepoint, we are single threaded and can set this.
2152 if (cld->jmethod_ids() == NULL) {
2153 cld->set_jmethod_ids(new JNIMethodBlock());
2154 }
2155 // jmethodID is a pointer to Method*
2156 return (jmethodID)cld->jmethod_ids()->add_method(m);
2157 }
2158 }
2159
2160 // Mark a jmethodID as free. This is called when there is a data race in
2161 // InstanceKlass while creating the jmethodID cache.
2162 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
2163 ClassLoaderData* cld = loader_data;
2164 Method** ptr = (Method**)m;
2165 assert(cld->jmethod_ids() != NULL, "should have method handles");
2166 cld->jmethod_ids()->destroy_method(ptr);
2167 }
2168
2169 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2170 // Can't assert the method_holder is the same because the new method has the
2171 // scratch method holder.
2172 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2173 == new_method->method_holder()->class_loader() ||
2174 new_method->method_holder()->class_loader() == NULL, // allow Unsafe substitution
2175 "changing to a different class loader");
2176 // Just change the method in place, jmethodID pointer doesn't change.
2177 *((Method**)jmid) = new_method;
2178 }
2179
2180 bool Method::is_method_id(jmethodID mid) {
2181 Method* m = resolve_jmethod_id(mid);
2182 assert(m != NULL, "should be called with non-null method");
2183 InstanceKlass* ik = m->method_holder();
2184 ClassLoaderData* cld = ik->class_loader_data();
2185 if (cld->jmethod_ids() == NULL) return false;
2186 return (cld->jmethod_ids()->contains((Method**)mid));
2187 }
2188
2189 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2190 if (mid == NULL) return NULL;
2191 Method* o = resolve_jmethod_id(mid);
2192 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
2193 return NULL;
2194 }
2195 return o;
2196 };
2197
2198 void Method::set_on_stack(const bool value) {
2199 // Set both the method itself and its constant pool. The constant pool
2200 // on stack means some method referring to it is also on the stack.
2201 constants()->set_on_stack(value);
2202
2203 bool already_set = on_stack();
2204 _access_flags.set_on_stack(value);
2205 if (value && !already_set) {
2206 MetadataOnStackMark::record(this);
2207 }
2208 assert(!value || !is_old() || is_obsolete() || is_running_emcp(),
2209 "emcp methods cannot run after emcp bit is cleared");
2210 }
2211
2212 // Called when the class loader is unloaded to make all methods weak.
2213 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2214 loader_data->jmethod_ids()->clear_all_methods();
2215 }
2216
2217 bool Method::has_method_vptr(const void* ptr) {
2218 Method m;
2219 // This assumes that the vtbl pointer is the first word of a C++ object.
2220 return dereference_vptr(&m) == dereference_vptr(ptr);
2221 }
2222
2223 // Check that this pointer is valid by checking that the vtbl pointer matches
2224 bool Method::is_valid_method(const Method* m) {
2225 if (m == NULL) {
2226 return false;
2227 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2228 // Quick sanity check on pointer.
2229 return false;
2230 } else if (m->is_shared()) {
2231 return MetaspaceShared::is_valid_shared_method(m);
2232 } else if (Metaspace::contains_non_shared(m)) {
2233 return has_method_vptr((const void*)m);
2234 } else {
2235 return false;
2236 }
2237 }
2238
2239 #ifndef PRODUCT
2240 void Method::print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) {
2241 out->print(" jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
2242 }
2243 #endif // PRODUCT
2244
2245
2246 // Printing
2247
2248 #ifndef PRODUCT
2249
2250 void Method::print_on(outputStream* st) const {
2251 ResourceMark rm;
2252 assert(is_method(), "must be method");
2253 st->print_cr("%s", internal_name());
2254 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this));
2255 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2256 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants()));
2257 constants()->print_value_on(st); st->cr();
2258 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2259 st->print (" - name: "); name()->print_value_on(st); st->cr();
2260 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2261 st->print_cr(" - max stack: %d", max_stack());
2262 st->print_cr(" - max locals: %d", max_locals());
2263 st->print_cr(" - size of params: %d", size_of_parameters());
2264 st->print_cr(" - method size: %d", method_size());
2265 if (intrinsic_id() != vmIntrinsics::_none)
2266 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
2267 if (highest_comp_level() != CompLevel_none)
2268 st->print_cr(" - highest level: %d", highest_comp_level());
2269 st->print_cr(" - vtable index: %d", _vtable_index);
2270 if (valid_itable_index())
2271 st->print_cr(" - itable index: %d", itable_index());
2272 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry()));
2273 st->print( " - adapters: ");
2274 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2275 if (a == NULL)
2276 st->print_cr(INTPTR_FORMAT, p2i(a));
2277 else
2278 a->print_adapter_on(st);
2279 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry()));
2280 st->print_cr(" - code size: %d", code_size());
2281 if (code_size() != 0) {
2282 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base()));
2283 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size()));
2284 }
2285 if (method_data() != NULL) {
2286 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data()));
2287 }
2288 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2289 if (checked_exceptions_length() > 0) {
2290 CheckedExceptionElement* table = checked_exceptions_start();
2291 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table));
2292 if (Verbose) {
2293 for (int i = 0; i < checked_exceptions_length(); i++) {
2294 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2295 }
2296 }
2297 }
2298 if (has_linenumber_table()) {
2299 u_char* table = compressed_linenumber_table();
2300 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table));
2301 if (Verbose) {
2302 CompressedLineNumberReadStream stream(table);
2303 while (stream.read_pair()) {
2304 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2305 }
2306 }
2307 }
2308 st->print_cr(" - localvar length: %d", localvariable_table_length());
2309 if (localvariable_table_length() > 0) {
2310 LocalVariableTableElement* table = localvariable_table_start();
2311 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table));
2312 if (Verbose) {
2313 for (int i = 0; i < localvariable_table_length(); i++) {
2314 int bci = table[i].start_bci;
2315 int len = table[i].length;
2316 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2317 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2318 int slot = table[i].slot;
2319 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2320 }
2321 }
2322 }
2323 if (code() != NULL) {
2324 st->print (" - compiled code: ");
2325 code()->print_value_on(st);
2326 }
2327 if (is_native()) {
2328 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function()));
2329 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler()));
2330 }
2331 }
2332
2333 void Method::print_linkage_flags(outputStream* st) {
2334 access_flags().print_on(st);
2335 if (is_default_method()) {
2336 st->print("default ");
2337 }
2338 if (is_overpass()) {
2339 st->print("overpass ");
2340 }
2341 }
2342 #endif //PRODUCT
2343
2344 void Method::print_value_on(outputStream* st) const {
2345 assert(is_method(), "must be method");
2346 st->print("%s", internal_name());
2347 print_address_on(st);
2348 st->print(" ");
2349 if (WizardMode) access_flags().print_on(st);
2350 name()->print_value_on(st);
2351 st->print(" ");
2352 signature()->print_value_on(st);
2353 st->print(" in ");
2354 method_holder()->print_value_on(st);
2355 if (WizardMode) st->print("#%d", _vtable_index);
2356 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2357 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2358 }
2359
2360 #if INCLUDE_SERVICES
2361 // Size Statistics
2362 void Method::collect_statistics(KlassSizeStats *sz) const {
2363 int mysize = sz->count(this);
2364 sz->_method_bytes += mysize;
2365 sz->_method_all_bytes += mysize;
2366 sz->_rw_bytes += mysize;
2367
2368 if (constMethod()) {
2369 constMethod()->collect_statistics(sz);
2370 }
2371 if (method_data()) {
2372 method_data()->collect_statistics(sz);
2373 }
2374 }
2375 #endif // INCLUDE_SERVICES
2376
2377 // LogTouchedMethods and PrintTouchedMethods
2378
2379 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because
2380 // the Method may be garbage collected. Let's roll our own hash table.
2381 class TouchedMethodRecord : CHeapObj<mtTracing> {
2382 public:
2383 // It's OK to store Symbols here because they will NOT be GC'ed if
2384 // LogTouchedMethods is enabled.
2385 TouchedMethodRecord* _next;
2386 Symbol* _class_name;
2387 Symbol* _method_name;
2388 Symbol* _method_signature;
2389 };
2390
2391 static const int TOUCHED_METHOD_TABLE_SIZE = 20011;
2392 static TouchedMethodRecord** _touched_method_table = NULL;
2393
2394 void Method::log_touched(TRAPS) {
2395
2396 const int table_size = TOUCHED_METHOD_TABLE_SIZE;
2397 Symbol* my_class = klass_name();
2398 Symbol* my_name = name();
2399 Symbol* my_sig = signature();
2400
2401 unsigned int hash = my_class->identity_hash() +
2402 my_name->identity_hash() +
2403 my_sig->identity_hash();
2404 juint index = juint(hash) % table_size;
2405
2406 MutexLocker ml(TouchedMethodLog_lock, THREAD);
2407 if (_touched_method_table == NULL) {
2408 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size,
2409 mtTracing, CURRENT_PC);
2410 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size);
2411 }
2412
2413 TouchedMethodRecord* ptr = _touched_method_table[index];
2414 while (ptr) {
2415 if (ptr->_class_name == my_class &&
2416 ptr->_method_name == my_name &&
2417 ptr->_method_signature == my_sig) {
2418 return;
2419 }
2420 if (ptr->_next == NULL) break;
2421 ptr = ptr->_next;
2422 }
2423 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing);
2424 my_class->increment_refcount();
2425 my_name->increment_refcount();
2426 my_sig->increment_refcount();
2427 nptr->_class_name = my_class;
2428 nptr->_method_name = my_name;
2429 nptr->_method_signature = my_sig;
2430 nptr->_next = NULL;
2431
2432 if (ptr == NULL) {
2433 // first
2434 _touched_method_table[index] = nptr;
2435 } else {
2436 ptr->_next = nptr;
2437 }
2438 }
2439
2440 void Method::print_touched_methods(outputStream* out) {
2441 MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock);
2442 out->print_cr("# Method::print_touched_methods version 1");
2443 if (_touched_method_table) {
2444 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) {
2445 TouchedMethodRecord* ptr = _touched_method_table[i];
2446 while(ptr) {
2447 ptr->_class_name->print_symbol_on(out); out->print(".");
2448 ptr->_method_name->print_symbol_on(out); out->print(":");
2449 ptr->_method_signature->print_symbol_on(out); out->cr();
2450 ptr = ptr->_next;
2451 }
2452 }
2453 }
2454 }
2455
2456 // Verification
2457
2458 void Method::verify_on(outputStream* st) {
2459 guarantee(is_method(), "object must be method");
2460 guarantee(constants()->is_constantPool(), "should be constant pool");
2461 MethodData* md = method_data();
2462 guarantee(md == NULL ||
2463 md->is_methodData(), "should be method data");
2464 }