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 "memory/universe.hpp"
45 #include "oops/constMethod.hpp"
46 #include "oops/constantPool.hpp"
47 #include "oops/method.inline.hpp"
48 #include "oops/methodData.hpp"
49 #include "oops/objArrayKlass.hpp"
50 #include "oops/objArrayOop.inline.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "oops/symbol.hpp"
53 #include "oops/valueKlass.inline.hpp"
54 #include "prims/jvmtiExport.hpp"
55 #include "prims/methodHandles.hpp"
56 #include "prims/nativeLookup.hpp"
57 #include "runtime/arguments.hpp"
58 #include "runtime/compilationPolicy.hpp"
59 #include "runtime/frame.inline.hpp"
60 #include "runtime/handles.inline.hpp"
61 #include "runtime/init.hpp"
62 #include "runtime/orderAccess.hpp"
63 #include "runtime/relocator.hpp"
64 #include "runtime/safepointVerifiers.hpp"
65 #include "runtime/sharedRuntime.hpp"
66 #include "runtime/signature.hpp"
67 #include "utilities/align.hpp"
68 #include "utilities/quickSort.hpp"
69 #include "utilities/vmError.hpp"
70 #include "utilities/xmlstream.hpp"
71
72 // Implementation of Method
73
74 Method* Method::allocate(ClassLoaderData* loader_data,
75 int byte_code_size,
76 AccessFlags access_flags,
77 InlineTableSizes* sizes,
78 ConstMethod::MethodType method_type,
79 TRAPS) {
80 assert(!access_flags.is_native() || byte_code_size == 0,
81 "native methods should not contain byte codes");
82 ConstMethod* cm = ConstMethod::allocate(loader_data,
83 byte_code_size,
84 sizes,
85 method_type,
86 CHECK_NULL);
87 int size = Method::size(access_flags.is_native());
88 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags);
89 }
90
91 Method::Method(ConstMethod* xconst, AccessFlags access_flags) {
92 NoSafepointVerifier no_safepoint;
93 set_constMethod(xconst);
94 set_access_flags(access_flags);
95 set_intrinsic_id(vmIntrinsics::_none);
96 set_force_inline(false);
97 set_hidden(false);
98 set_dont_inline(false);
99 set_has_injected_profile(false);
100 set_method_data(NULL);
101 clear_method_counters();
102 set_vtable_index(Method::garbage_vtable_index);
103
104 // Fix and bury in Method*
105 set_interpreter_entry(NULL); // sets i2i entry and from_int
106 set_adapter_entry(NULL);
107 clear_code(false /* don't need a lock */); // from_c/from_i get set to c2i/i2i
108
109 if (access_flags.is_native()) {
110 clear_native_function();
111 set_signature_handler(NULL);
112 }
113 NOT_PRODUCT(set_compiled_invocation_count(0);)
114 }
115
116 // Release Method*. The nmethod will be gone when we get here because
117 // we've walked the code cache.
118 void Method::deallocate_contents(ClassLoaderData* loader_data) {
119 MetadataFactory::free_metadata(loader_data, constMethod());
120 set_constMethod(NULL);
121 #if INCLUDE_JVMCI
122 if (method_data()) {
123 FailedSpeculation::free_failed_speculations(method_data()->get_failed_speculations_address());
124 }
125 #endif
126 MetadataFactory::free_metadata(loader_data, method_data());
127 set_method_data(NULL);
128 MetadataFactory::free_metadata(loader_data, method_counters());
129 clear_method_counters();
130 // The nmethod will be gone when we get here.
131 if (code() != NULL) _code = NULL;
132 }
133
134 address Method::get_i2c_entry() {
135 assert(adapter() != NULL, "must have");
136 return adapter()->get_i2c_entry();
137 }
138
139 address Method::get_c2i_entry() {
140 assert(adapter() != NULL, "must have");
141 return adapter()->get_c2i_entry();
142 }
143
144 address Method::get_c2i_value_entry() {
145 assert(adapter() != NULL, "must have");
146 return adapter()->get_c2i_value_entry();
147 }
148
149 address Method::get_c2i_unverified_entry() {
150 assert(adapter() != NULL, "must have");
151 return adapter()->get_c2i_unverified_entry();
152 }
153
154 address Method::get_c2i_unverified_value_entry() {
155 assert(adapter() != NULL, "must have");
156 return adapter()->get_c2i_unverified_value_entry();
157 }
158
159 address Method::get_c2i_no_clinit_check_entry() {
160 assert(VM_Version::supports_fast_class_init_checks(), "");
161 assert(adapter() != NULL, "must have");
162 return adapter()->get_c2i_no_clinit_check_entry();
163 }
164
165 char* Method::name_and_sig_as_C_string() const {
166 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
167 }
168
169 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
170 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
171 }
172
173 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
174 const char* klass_name = klass->external_name();
175 int klass_name_len = (int)strlen(klass_name);
176 int method_name_len = method_name->utf8_length();
177 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
178 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
179 strcpy(dest, klass_name);
180 dest[klass_name_len] = '.';
181 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
182 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
183 dest[len] = 0;
184 return dest;
185 }
186
187 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
188 Symbol* klass_name = klass->name();
189 klass_name->as_klass_external_name(buf, size);
190 int len = (int)strlen(buf);
191
192 if (len < size - 1) {
193 buf[len++] = '.';
194
195 method_name->as_C_string(&(buf[len]), size - len);
196 len = (int)strlen(buf);
197
198 signature->as_C_string(&(buf[len]), size - len);
199 }
200
201 return buf;
202 }
203
204 const char* Method::external_name() const {
205 return external_name(constants()->pool_holder(), name(), signature());
206 }
207
208 void Method::print_external_name(outputStream *os) const {
209 print_external_name(os, constants()->pool_holder(), name(), signature());
210 }
211
212 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
213 stringStream ss;
214 print_external_name(&ss, klass, method_name, signature);
215 return ss.as_string();
216 }
217
218 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
219 signature->print_as_signature_external_return_type(os);
220 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
221 signature->print_as_signature_external_parameters(os);
222 os->print(")");
223 }
224
225 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
226 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
227 // access exception table
228 ExceptionTable table(mh());
229 int length = table.length();
230 // iterate through all entries sequentially
231 constantPoolHandle pool(THREAD, mh->constants());
232 for (int i = 0; i < length; i ++) {
233 //reacquire the table in case a GC happened
234 ExceptionTable table(mh());
235 int beg_bci = table.start_pc(i);
236 int end_bci = table.end_pc(i);
237 assert(beg_bci <= end_bci, "inconsistent exception table");
238 if (beg_bci <= throw_bci && throw_bci < end_bci) {
239 // exception handler bci range covers throw_bci => investigate further
240 int handler_bci = table.handler_pc(i);
241 int klass_index = table.catch_type_index(i);
242 if (klass_index == 0) {
243 return handler_bci;
244 } else if (ex_klass == NULL) {
245 return handler_bci;
246 } else {
247 // we know the exception class => get the constraint class
248 // this may require loading of the constraint class; if verification
249 // fails or some other exception occurs, return handler_bci
250 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
251 assert(k != NULL, "klass not loaded");
252 if (ex_klass->is_subtype_of(k)) {
253 return handler_bci;
254 }
255 }
256 }
257 }
258
259 return -1;
260 }
261
262 void Method::mask_for(int bci, InterpreterOopMap* mask) {
263 methodHandle h_this(Thread::current(), this);
264 // Only GC uses the OopMapCache during thread stack root scanning
265 // any other uses generate an oopmap but do not save it in the cache.
266 if (Universe::heap()->is_gc_active()) {
267 method_holder()->mask_for(h_this, bci, mask);
268 } else {
269 OopMapCache::compute_one_oop_map(h_this, bci, mask);
270 }
271 return;
272 }
273
274
275 int Method::bci_from(address bcp) const {
276 if (is_native() && bcp == 0) {
277 return 0;
278 }
279 #ifdef ASSERT
280 {
281 ResourceMark rm;
282 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(),
283 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s",
284 p2i(bcp), name_and_sig_as_C_string());
285 }
286 #endif
287 return bcp - code_base();
288 }
289
290
291 int Method::validate_bci(int bci) const {
292 return (bci == 0 || bci < code_size()) ? bci : -1;
293 }
294
295 // Return bci if it appears to be a valid bcp
296 // Return -1 otherwise.
297 // Used by profiling code, when invalid data is a possibility.
298 // The caller is responsible for validating the Method* itself.
299 int Method::validate_bci_from_bcp(address bcp) const {
300 // keep bci as -1 if not a valid bci
301 int bci = -1;
302 if (bcp == 0 || bcp == code_base()) {
303 // code_size() may return 0 and we allow 0 here
304 // the method may be native
305 bci = 0;
306 } else if (contains(bcp)) {
307 bci = bcp - code_base();
308 }
309 // Assert that if we have dodged any asserts, bci is negative.
310 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
311 return bci;
312 }
313
314 address Method::bcp_from(int bci) const {
315 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
316 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
317 address bcp = code_base() + bci;
318 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
319 return bcp;
320 }
321
322 address Method::bcp_from(address bcp) const {
323 if (is_native() && bcp == NULL) {
324 return code_base();
325 } else {
326 return bcp;
327 }
328 }
329
330 int Method::size(bool is_native) {
331 // If native, then include pointers for native_function and signature_handler
332 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
333 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
334 return align_metadata_size(header_size() + extra_words);
335 }
336
337
338 Symbol* Method::klass_name() const {
339 return method_holder()->name();
340 }
341
342
343 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
344 log_trace(cds)("Iter(Method): %p", this);
345
346 it->push(&_constMethod);
347 it->push(&_method_data);
348 it->push(&_method_counters);
349 }
350
351 // Attempt to return method oop to original state. Clear any pointers
352 // (to objects outside the shared spaces). We won't be able to predict
353 // where they should point in a new JVM. Further initialize some
354 // entries now in order allow them to be write protected later.
355
356 void Method::remove_unshareable_info() {
357 unlink_method();
358 }
359
360 void Method::set_vtable_index(int index) {
361 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
362 // At runtime initialize_vtable is rerun as part of link_class_impl()
363 // for a shared class loaded by the non-boot loader to obtain the loader
364 // constraints based on the runtime classloaders' context.
365 return; // don't write into the shared class
366 } else {
367 _vtable_index = index;
368 }
369 }
370
371 void Method::set_itable_index(int index) {
372 if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
373 // At runtime initialize_itable is rerun as part of link_class_impl()
374 // for a shared class loaded by the non-boot loader to obtain the loader
375 // constraints based on the runtime classloaders' context. The dumptime
376 // itable index should be the same as the runtime index.
377 assert(_vtable_index == itable_index_max - index,
378 "archived itable index is different from runtime index");
379 return; // don’t write into the shared class
380 } else {
381 _vtable_index = itable_index_max - index;
382 }
383 assert(valid_itable_index(), "");
384 }
385
386
387
388 bool Method::was_executed_more_than(int n) {
389 // Invocation counter is reset when the Method* is compiled.
390 // If the method has compiled code we therefore assume it has
391 // be excuted more than n times.
392 if (is_accessor() || is_empty_method() || (code() != NULL)) {
393 // interpreter doesn't bump invocation counter of trivial methods
394 // compiler does not bump invocation counter of compiled methods
395 return true;
396 }
397 else if ((method_counters() != NULL &&
398 method_counters()->invocation_counter()->carry()) ||
399 (method_data() != NULL &&
400 method_data()->invocation_counter()->carry())) {
401 // The carry bit is set when the counter overflows and causes
402 // a compilation to occur. We don't know how many times
403 // the counter has been reset, so we simply assume it has
404 // been executed more than n times.
405 return true;
406 } else {
407 return invocation_count() > n;
408 }
409 }
410
411 void Method::print_invocation_count() {
412 if (is_static()) tty->print("static ");
413 if (is_final()) tty->print("final ");
414 if (is_synchronized()) tty->print("synchronized ");
415 if (is_native()) tty->print("native ");
416 tty->print("%s::", method_holder()->external_name());
417 name()->print_symbol_on(tty);
418 signature()->print_symbol_on(tty);
419
420 if (WizardMode) {
421 // dump the size of the byte codes
422 tty->print(" {%d}", code_size());
423 }
424 tty->cr();
425
426 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count());
427 tty->print_cr (" invocation_counter: %8d ", invocation_count());
428 tty->print_cr (" backedge_counter: %8d ", backedge_count());
429 #ifndef PRODUCT
430 if (CountCompiledCalls) {
431 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count());
432 }
433 #endif
434 }
435
436 // Build a MethodData* object to hold information about this method
437 // collected in the interpreter.
438 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) {
439 // Do not profile the method if metaspace has hit an OOM previously
440 // allocating profiling data. Callers clear pending exception so don't
441 // add one here.
442 if (ClassLoaderDataGraph::has_metaspace_oom()) {
443 return;
444 }
445
446 // Grab a lock here to prevent multiple
447 // MethodData*s from being created.
448 MutexLocker ml(MethodData_lock, THREAD);
449 if (method->method_data() == NULL) {
450 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
451 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
452 if (HAS_PENDING_EXCEPTION) {
453 CompileBroker::log_metaspace_failure();
454 ClassLoaderDataGraph::set_metaspace_oom(true);
455 return; // return the exception (which is cleared)
456 }
457
458 method->set_method_data(method_data);
459 if (PrintMethodData && (Verbose || WizardMode)) {
460 ResourceMark rm(THREAD);
461 tty->print("build_interpreter_method_data for ");
462 method->print_name(tty);
463 tty->cr();
464 // At the end of the run, the MDO, full of data, will be dumped.
465 }
466 }
467 }
468
469 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
470 // Do not profile the method if metaspace has hit an OOM previously
471 if (ClassLoaderDataGraph::has_metaspace_oom()) {
472 return NULL;
473 }
474
475 methodHandle mh(m);
476 MethodCounters* counters = MethodCounters::allocate(mh, THREAD);
477 if (HAS_PENDING_EXCEPTION) {
478 CompileBroker::log_metaspace_failure();
479 ClassLoaderDataGraph::set_metaspace_oom(true);
480 return NULL; // return the exception (which is cleared)
481 }
482 if (!mh->init_method_counters(counters)) {
483 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
484 }
485
486 if (LogTouchedMethods) {
487 mh->log_touched(CHECK_NULL);
488 }
489
490 return mh->method_counters();
491 }
492
493 bool Method::init_method_counters(MethodCounters* counters) {
494 // Try to install a pointer to MethodCounters, return true on success.
495 return Atomic::replace_if_null(counters, &_method_counters);
496 }
497
498 int Method::extra_stack_words() {
499 // not an inline function, to avoid a header dependency on Interpreter
500 return extra_stack_entries() * Interpreter::stackElementSize;
501 }
502
503
504 void Method::compute_size_of_parameters(Thread *thread) {
505 ArgumentSizeComputer asc(signature());
506 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
507 }
508
509 BasicType Method::result_type() const {
510 ResultTypeFinder rtf(signature());
511 return rtf.type();
512 }
513
514 // ValueKlass the method is declared to return. This must not
515 // safepoint as it is called with references live on the stack at
516 // locations the GC is unaware of.
517 ValueKlass* Method::returned_value_type(Thread* thread) const {
518 SignatureStream ss(signature());
519 while (!ss.at_return_type()) {
520 ss.next();
521 }
522 Handle class_loader(thread, method_holder()->class_loader());
523 Handle protection_domain(thread, method_holder()->protection_domain());
524 Klass* k = NULL;
525 {
526 NoSafepointVerifier nsv;
527 k = ss.as_klass(class_loader, protection_domain, SignatureStream::ReturnNull, thread);
528 }
529 assert(k != NULL && !thread->has_pending_exception(), "can't resolve klass");
530 return ValueKlass::cast(k);
531 }
532
533 bool Method::is_empty_method() const {
534 return code_size() == 1
535 && *code_base() == Bytecodes::_return;
536 }
537
538
539 bool Method::is_vanilla_constructor() const {
540 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
541 // which only calls the superclass vanilla constructor and possibly does stores of
542 // zero constants to local fields:
543 //
544 // aload_0
545 // invokespecial
546 // indexbyte1
547 // indexbyte2
548 //
549 // followed by an (optional) sequence of:
550 //
551 // aload_0
552 // aconst_null / iconst_0 / fconst_0 / dconst_0
553 // putfield
554 // indexbyte1
555 // indexbyte2
556 //
557 // followed by:
558 //
559 // return
560
561 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
562 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
563 int size = code_size();
564 // Check if size match
565 if (size == 0 || size % 5 != 0) return false;
566 address cb = code_base();
567 int last = size - 1;
568 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
569 // Does not call superclass default constructor
570 return false;
571 }
572 // Check optional sequence
573 for (int i = 4; i < last; i += 5) {
574 if (cb[i] != Bytecodes::_aload_0) return false;
575 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
576 if (cb[i+2] != Bytecodes::_putfield) return false;
577 }
578 return true;
579 }
580
581
582 bool Method::compute_has_loops_flag() {
583 BytecodeStream bcs(this);
584 Bytecodes::Code bc;
585
586 while ((bc = bcs.next()) >= 0) {
587 switch( bc ) {
588 case Bytecodes::_ifeq:
589 case Bytecodes::_ifnull:
590 case Bytecodes::_iflt:
591 case Bytecodes::_ifle:
592 case Bytecodes::_ifne:
593 case Bytecodes::_ifnonnull:
594 case Bytecodes::_ifgt:
595 case Bytecodes::_ifge:
596 case Bytecodes::_if_icmpeq:
597 case Bytecodes::_if_icmpne:
598 case Bytecodes::_if_icmplt:
599 case Bytecodes::_if_icmpgt:
600 case Bytecodes::_if_icmple:
601 case Bytecodes::_if_icmpge:
602 case Bytecodes::_if_acmpeq:
603 case Bytecodes::_if_acmpne:
604 case Bytecodes::_goto:
605 case Bytecodes::_jsr:
606 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
607 break;
608
609 case Bytecodes::_goto_w:
610 case Bytecodes::_jsr_w:
611 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
612 break;
613
614 default:
615 break;
616 }
617 }
618 _access_flags.set_loops_flag_init();
619 return _access_flags.has_loops();
620 }
621
622 bool Method::is_final_method(AccessFlags class_access_flags) const {
623 // or "does_not_require_vtable_entry"
624 // default method or overpass can occur, is not final (reuses vtable entry)
625 // private methods in classes get vtable entries for backward class compatibility.
626 if (is_overpass() || is_default_method()) return false;
627 return is_final() || class_access_flags.is_final();
628 }
629
630 bool Method::is_final_method() const {
631 return is_final_method(method_holder()->access_flags());
632 }
633
634 bool Method::is_default_method() const {
635 if (method_holder() != NULL &&
636 method_holder()->is_interface() &&
637 !is_abstract() && !is_private()) {
638 return true;
639 } else {
640 return false;
641 }
642 }
643
644 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
645 if (is_final_method(class_access_flags)) return true;
646 #ifdef ASSERT
647 ResourceMark rm;
648 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
649 if (class_access_flags.is_interface()) {
650 assert(is_nonv == is_static() || is_nonv == is_private(),
651 "nonvirtual unexpected for non-static, non-private: %s",
652 name_and_sig_as_C_string());
653 }
654 #endif
655 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
656 return vtable_index() == nonvirtual_vtable_index;
657 }
658
659 bool Method::can_be_statically_bound() const {
660 return can_be_statically_bound(method_holder()->access_flags());
661 }
662
663 bool Method::can_be_statically_bound(InstanceKlass* context) const {
664 return (method_holder() == context) && can_be_statically_bound();
665 }
666
667 bool Method::is_accessor() const {
668 return is_getter() || is_setter();
669 }
670
671 bool Method::is_getter() const {
672 if (code_size() != 5) return false;
673 if (size_of_parameters() != 1) return false;
674 if (java_code_at(0) != Bytecodes::_aload_0) return false;
675 if (java_code_at(1) != Bytecodes::_getfield) return false;
676 switch (java_code_at(4)) {
677 case Bytecodes::_ireturn:
678 case Bytecodes::_lreturn:
679 case Bytecodes::_freturn:
680 case Bytecodes::_dreturn:
681 case Bytecodes::_areturn:
682 break;
683 default:
684 return false;
685 }
686 return true;
687 }
688
689 bool Method::is_setter() const {
690 if (code_size() != 6) return false;
691 if (java_code_at(0) != Bytecodes::_aload_0) return false;
692 switch (java_code_at(1)) {
693 case Bytecodes::_iload_1:
694 case Bytecodes::_aload_1:
695 case Bytecodes::_fload_1:
696 if (size_of_parameters() != 2) return false;
697 break;
698 case Bytecodes::_dload_1:
699 case Bytecodes::_lload_1:
700 if (size_of_parameters() != 3) return false;
701 break;
702 default:
703 return false;
704 }
705 if (java_code_at(2) != Bytecodes::_putfield) return false;
706 if (java_code_at(5) != Bytecodes::_return) return false;
707 return true;
708 }
709
710 bool Method::is_constant_getter() const {
711 int last_index = code_size() - 1;
712 // Check if the first 1-3 bytecodes are a constant push
713 // and the last bytecode is a return.
714 return (2 <= code_size() && code_size() <= 4 &&
715 Bytecodes::is_const(java_code_at(0)) &&
716 Bytecodes::length_for(java_code_at(0)) == last_index &&
717 Bytecodes::is_return(java_code_at(last_index)));
718 }
719
720 bool Method::is_object_constructor_or_class_initializer() const {
721 return (is_object_constructor() || is_class_initializer());
722 }
723
724 bool Method::is_class_initializer() const {
725 // For classfiles version 51 or greater, ensure that the clinit method is
726 // static. Non-static methods with the name "<clinit>" are not static
727 // initializers. (older classfiles exempted for backward compatibility)
728 return (name() == vmSymbols::class_initializer_name() &&
729 (is_static() ||
730 method_holder()->major_version() < 51));
731 }
732
733 // A method named <init>, if non-static, is a classic object constructor.
734 bool Method::is_object_constructor() const {
735 return name() == vmSymbols::object_initializer_name() && !is_static();
736 }
737
738 // A static method named <init> is a factory for an inline class.
739 bool Method::is_static_init_factory() const {
740 return name() == vmSymbols::object_initializer_name() && is_static();
741 }
742
743 bool Method::needs_clinit_barrier() const {
744 return is_static() && !method_holder()->is_initialized();
745 }
746
747 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
748 int length = method->checked_exceptions_length();
749 if (length == 0) { // common case
750 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
751 } else {
752 methodHandle h_this(THREAD, method);
753 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
754 objArrayHandle mirrors (THREAD, m_oop);
755 for (int i = 0; i < length; i++) {
756 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
757 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
758 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
759 mirrors->obj_at_put(i, k->java_mirror());
760 }
761 return mirrors;
762 }
763 };
764
765
766 int Method::line_number_from_bci(int bci) const {
767 int best_bci = 0;
768 int best_line = -1;
769 if (bci == SynchronizationEntryBCI) bci = 0;
770 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
771 // The line numbers are a short array of 2-tuples [start_pc, line_number].
772 // Not necessarily sorted and not necessarily one-to-one.
773 CompressedLineNumberReadStream stream(compressed_linenumber_table());
774 while (stream.read_pair()) {
775 if (stream.bci() == bci) {
776 // perfect match
777 return stream.line();
778 } else {
779 // update best_bci/line
780 if (stream.bci() < bci && stream.bci() >= best_bci) {
781 best_bci = stream.bci();
782 best_line = stream.line();
783 }
784 }
785 }
786 }
787 return best_line;
788 }
789
790
791 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
792 if( constants()->tag_at(klass_index).is_unresolved_klass()) {
793 Thread *thread = Thread::current();
794 Symbol* klass_name = constants()->klass_name_at(klass_index);
795 Handle loader(thread, method_holder()->class_loader());
796 Handle prot (thread, method_holder()->protection_domain());
797 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
798 } else {
799 return true;
800 }
801 }
802
803
804 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
805 int klass_index = constants()->klass_ref_index_at(refinfo_index);
806 if (must_be_resolved) {
807 // Make sure klass is resolved in constantpool.
808 if (constants()->tag_at(klass_index).is_unresolved_klass()) {
809 return false;
810 }
811 }
812 return is_klass_loaded_by_klass_index(klass_index);
813 }
814
815
816 void Method::set_native_function(address function, bool post_event_flag) {
817 assert(function != NULL, "use clear_native_function to unregister natives");
818 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
819 address* native_function = native_function_addr();
820
821 // We can see racers trying to place the same native function into place. Once
822 // is plenty.
823 address current = *native_function;
824 if (current == function) return;
825 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
826 function != NULL) {
827 // native_method_throw_unsatisfied_link_error_entry() should only
828 // be passed when post_event_flag is false.
829 assert(function !=
830 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
831 "post_event_flag mis-match");
832
833 // post the bind event, and possible change the bind function
834 JvmtiExport::post_native_method_bind(this, &function);
835 }
836 *native_function = function;
837 // This function can be called more than once. We must make sure that we always
838 // use the latest registered method -> check if a stub already has been generated.
839 // If so, we have to make it not_entrant.
840 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates
841 if (nm != NULL) {
842 nm->make_not_entrant();
843 }
844 }
845
846
847 bool Method::has_native_function() const {
848 if (is_method_handle_intrinsic())
849 return false; // special-cased in SharedRuntime::generate_native_wrapper
850 address func = native_function();
851 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
852 }
853
854
855 void Method::clear_native_function() {
856 // Note: is_method_handle_intrinsic() is allowed here.
857 set_native_function(
858 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
859 !native_bind_event_is_interesting);
860 clear_code();
861 }
862
863
864 void Method::set_signature_handler(address handler) {
865 address* signature_handler = signature_handler_addr();
866 *signature_handler = handler;
867 }
868
869
870 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
871 assert(reason != NULL, "must provide a reason");
872 if (PrintCompilation && report) {
873 ttyLocker ttyl;
874 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
875 if (comp_level == CompLevel_all) {
876 tty->print("all levels ");
877 } else {
878 tty->print("level %d ", comp_level);
879 }
880 this->print_short_name(tty);
881 int size = this->code_size();
882 if (size > 0) {
883 tty->print(" (%d bytes)", size);
884 }
885 if (reason != NULL) {
886 tty->print(" %s", reason);
887 }
888 tty->cr();
889 }
890 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
891 ttyLocker ttyl;
892 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
893 os::current_thread_id(), is_osr, comp_level);
894 if (reason != NULL) {
895 xtty->print(" reason=\'%s\'", reason);
896 }
897 xtty->method(this);
898 xtty->stamp();
899 xtty->end_elem();
900 }
901 }
902
903 bool Method::is_always_compilable() const {
904 // Generated adapters must be compiled
905 if (is_method_handle_intrinsic() && is_synthetic()) {
906 assert(!is_not_c1_compilable(), "sanity check");
907 assert(!is_not_c2_compilable(), "sanity check");
908 return true;
909 }
910
911 return false;
912 }
913
914 bool Method::is_not_compilable(int comp_level) const {
915 if (number_of_breakpoints() > 0)
916 return true;
917 if (is_always_compilable())
918 return false;
919 if (comp_level == CompLevel_any)
920 return is_not_c1_compilable() || is_not_c2_compilable();
921 if (is_c1_compile(comp_level))
922 return is_not_c1_compilable();
923 if (is_c2_compile(comp_level))
924 return is_not_c2_compilable();
925 return false;
926 }
927
928 // call this when compiler finds that this method is not compilable
929 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
930 if (is_always_compilable()) {
931 // Don't mark a method which should be always compilable
932 return;
933 }
934 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
935 if (comp_level == CompLevel_all) {
936 set_not_c1_compilable();
937 set_not_c2_compilable();
938 } else {
939 if (is_c1_compile(comp_level))
940 set_not_c1_compilable();
941 if (is_c2_compile(comp_level))
942 set_not_c2_compilable();
943 }
944 CompilationPolicy::policy()->disable_compilation(this);
945 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
946 }
947
948 bool Method::is_not_osr_compilable(int comp_level) const {
949 if (is_not_compilable(comp_level))
950 return true;
951 if (comp_level == CompLevel_any)
952 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
953 if (is_c1_compile(comp_level))
954 return is_not_c1_osr_compilable();
955 if (is_c2_compile(comp_level))
956 return is_not_c2_osr_compilable();
957 return false;
958 }
959
960 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
961 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
962 if (comp_level == CompLevel_all) {
963 set_not_c1_osr_compilable();
964 set_not_c2_osr_compilable();
965 } else {
966 if (is_c1_compile(comp_level))
967 set_not_c1_osr_compilable();
968 if (is_c2_compile(comp_level))
969 set_not_c2_osr_compilable();
970 }
971 CompilationPolicy::policy()->disable_compilation(this);
972 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
973 }
974
975 // Revert to using the interpreter and clear out the nmethod
976 void Method::clear_code(bool acquire_lock /* = true */) {
977 MutexLocker pl(acquire_lock ? Patching_lock : NULL, Mutex::_no_safepoint_check_flag);
978 // this may be NULL if c2i adapters have not been made yet
979 // Only should happen at allocate time.
980 if (adapter() == NULL) {
981 _from_compiled_entry = NULL;
982 _from_compiled_value_entry = NULL;
983 _from_compiled_value_ro_entry = NULL;
984 } else {
985 _from_compiled_entry = adapter()->get_c2i_entry();
986 _from_compiled_value_entry = adapter()->get_c2i_value_entry();
987 _from_compiled_value_ro_entry = adapter()->get_c2i_value_ro_entry();
988 }
989 OrderAccess::storestore();
990 _from_interpreted_entry = _i2i_entry;
991 OrderAccess::storestore();
992 _code = NULL;
993 }
994
995 #if INCLUDE_CDS
996 // Called by class data sharing to remove any entry points (which are not shared)
997 void Method::unlink_method() {
998 _code = NULL;
999
1000 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "dump time only");
1001 // Set the values to what they should be at run time. Note that
1002 // this Method can no longer be executed during dump time.
1003 _i2i_entry = Interpreter::entry_for_cds_method(this);
1004 _from_interpreted_entry = _i2i_entry;
1005
1006 if (DynamicDumpSharedSpaces) {
1007 assert(_from_compiled_entry != NULL, "sanity");
1008 } else {
1009 // TODO: Simplify the adapter trampoline allocation for static archiving.
1010 // Remove the use of CDSAdapterHandlerEntry.
1011 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter();
1012 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline());
1013 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline();
1014 assert(*((int*)_from_compiled_entry) == 0,
1015 "must be NULL during dump time, to be initialized at run time");
1016 _from_compiled_value_ro_entry = cds_adapter->get_c2i_entry_trampoline(); // FIXME - doesn't work if you have value args!
1017 assert(*((int*)_from_compiled_value_ro_entry) == 0,
1018 "must be NULL during dump time, to be initialized at run time");
1019 _from_compiled_value_entry = cds_adapter->get_c2i_entry_trampoline(); // FIXME - doesn't work if you have value args (or this is value type)!
1020 assert(*((int*)_from_compiled_value_entry) == 0,
1021 "must be NULL during dump time, to be initialized at run time");
1022 assert(!method_holder()->is_value(), "FIXME: valuetype not supported by CDS");
1023 }
1024
1025 if (is_native()) {
1026 *native_function_addr() = NULL;
1027 set_signature_handler(NULL);
1028 }
1029 NOT_PRODUCT(set_compiled_invocation_count(0);)
1030
1031 set_method_data(NULL);
1032 clear_method_counters();
1033 }
1034 #endif
1035
1036 /****************************************************************************
1037 // The following illustrates how the entries work for CDS shared Methods:
1038 //
1039 // Our goal is to delay writing into a shared Method until it's compiled.
1040 // Hence, we want to determine the initial values for _i2i_entry,
1041 // _from_interpreted_entry and _from_compiled_entry during CDS dump time.
1042 //
1043 // In this example, both Methods A and B have the _i2i_entry of "zero_locals".
1044 // They also have similar signatures so that they will share the same
1045 // AdapterHandlerEntry.
1046 //
1047 // _adapter_trampoline points to a fixed location in the RW section of
1048 // the CDS archive. This location initially contains a NULL pointer. When the
1049 // first of method A or B is linked, an AdapterHandlerEntry is allocated
1050 // dynamically, and its c2i/i2c entries are generated.
1051 //
1052 // _i2i_entry and _from_interpreted_entry initially points to the same
1053 // (fixed) location in the CODE section of the CDS archive. This contains
1054 // an unconditional branch to the actual entry for "zero_locals", which is
1055 // generated at run time and may be on an arbitrary address. Thus, the
1056 // unconditional branch is also generated at run time to jump to the correct
1057 // address.
1058 //
1059 // Similarly, _from_compiled_entry points to a fixed address in the CODE
1060 // section. This address has enough space for an unconditional branch
1061 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is
1062 // initialized, and the address for the actual c2i_entry is known, we emit a
1063 // branch instruction here to branch to the actual c2i_entry.
1064 //
1065 // The effect of the extra branch on the i2i and c2i entries is negligible.
1066 //
1067 // The reason for putting _adapter_trampoline in RO is many shared Methods
1068 // share the same AdapterHandlerEntry, so we can save space in the RW section
1069 // by having the extra indirection.
1070
1071
1072 [Method A: RW]
1073 _constMethod ----> [ConstMethod: RO]
1074 _adapter_trampoline -----------+
1075 |
1076 _i2i_entry (same value as method B) |
1077 _from_interpreted_entry (same value as method B) |
1078 _from_compiled_entry (same value as method B) |
1079 |
1080 |
1081 [Method B: RW] +--------+
1082 _constMethod ----> [ConstMethod: RO] |
1083 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+
1084 |
1085 +-------------------------------+
1086 |
1087 +----> [AdapterHandlerEntry] (allocated at run time)
1088 _fingerprint
1089 _c2i_entry ---------------------------------+->[c2i entry..]
1090 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] |
1091 _from_interpreted_entry | _c2i_unverified_entry | |
1092 | | _c2i_no_clinit_check_entry| |
1093 | | (_cds_entry_table: CODE) | |
1094 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | |
1095 | | (allocated at run time) | |
1096 | | ... [asm code ...] | |
1097 +-[not compiled]-+ [n]: jmp _entry_table[n] | |
1098 | | |
1099 | | |
1100 +-[compiled]-------------------------------------------------------------------+ |
1101 |
1102 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) |
1103 [jmp c2i_entry] ------------------------------------------------------+
1104
1105 ***/
1106
1107 // Called when the method_holder is getting linked. Setup entrypoints so the method
1108 // is ready to be called from interpreter, compiler, and vtables.
1109 void Method::link_method(const methodHandle& h_method, TRAPS) {
1110 // If the code cache is full, we may reenter this function for the
1111 // leftover methods that weren't linked.
1112 if (is_shared()) {
1113 address entry = Interpreter::entry_for_cds_method(h_method);
1114 assert(entry != NULL && entry == _i2i_entry,
1115 "should be correctly set during dump time");
1116 if (adapter() != NULL) {
1117 return;
1118 }
1119 assert(entry == _from_interpreted_entry,
1120 "should be correctly set during dump time");
1121 } else if (_i2i_entry != NULL) {
1122 return;
1123 }
1124 assert( _code == NULL, "nothing compiled yet" );
1125
1126 // Setup interpreter entrypoint
1127 assert(this == h_method(), "wrong h_method()" );
1128
1129 if (!is_shared()) {
1130 assert(adapter() == NULL, "init'd to NULL");
1131 address entry = Interpreter::entry_for_method(h_method);
1132 assert(entry != NULL, "interpreter entry must be non-null");
1133 // Sets both _i2i_entry and _from_interpreted_entry
1134 set_interpreter_entry(entry);
1135 }
1136
1137 // Don't overwrite already registered native entries.
1138 if (is_native() && !has_native_function()) {
1139 set_native_function(
1140 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1141 !native_bind_event_is_interesting);
1142 }
1143
1144 // Setup compiler entrypoint. This is made eagerly, so we do not need
1145 // special handling of vtables. An alternative is to make adapters more
1146 // lazily by calling make_adapter() from from_compiled_entry() for the
1147 // normal calls. For vtable calls life gets more complicated. When a
1148 // call-site goes mega-morphic we need adapters in all methods which can be
1149 // called from the vtable. We need adapters on such methods that get loaded
1150 // later. Ditto for mega-morphic itable calls. If this proves to be a
1151 // problem we'll make these lazily later.
1152 (void) make_adapters(h_method, CHECK);
1153
1154 // ONLY USE the h_method now as make_adapter may have blocked
1155
1156 }
1157
1158 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1159 // Adapters for compiled code are made eagerly here. They are fairly
1160 // small (generally < 100 bytes) and quick to make (and cached and shared)
1161 // so making them eagerly shouldn't be too expensive.
1162 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1163 if (adapter == NULL ) {
1164 if (!is_init_completed()) {
1165 // Don't throw exceptions during VM initialization because java.lang.* classes
1166 // might not have been initialized, causing problems when constructing the
1167 // Java exception object.
1168 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1169 } else {
1170 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1171 }
1172 }
1173
1174 if (mh->is_shared()) {
1175 assert(mh->adapter() == adapter, "must be");
1176 assert(mh->_from_compiled_entry != NULL, "must be");
1177 assert(mh->_from_compiled_value_entry != NULL, "must be");
1178 assert(mh->_from_compiled_value_ro_entry != NULL, "must be");
1179 } else {
1180 mh->set_adapter_entry(adapter);
1181 mh->_from_compiled_entry = adapter->get_c2i_entry();
1182 mh->_from_compiled_value_entry = adapter->get_c2i_value_entry();
1183 mh->_from_compiled_value_ro_entry = adapter->get_c2i_value_ro_entry();
1184 }
1185 return adapter->get_c2i_entry();
1186 }
1187
1188 void Method::restore_unshareable_info(TRAPS) {
1189 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
1190
1191 // Since restore_unshareable_info can be called more than once for a method, don't
1192 // redo any work.
1193 if (adapter() == NULL) {
1194 methodHandle mh(THREAD, this);
1195 link_method(mh, CHECK);
1196 }
1197 }
1198
1199 address Method::from_compiled_entry_no_trampoline(bool caller_is_c1) const {
1200 CompiledMethod *code = OrderAccess::load_acquire(&_code);
1201 if (caller_is_c1) {
1202 // C1 - value arguments are passed as objects
1203 if (code) {
1204 return code->verified_value_entry_point();
1205 } else {
1206 return adapter()->get_c2i_value_entry();
1207 }
1208 } else {
1209 // C2 - value arguments may be passed as fields
1210 if (code) {
1211 return code->verified_entry_point();
1212 } else {
1213 return adapter()->get_c2i_entry();
1214 }
1215 }
1216 }
1217
1218 // The verified_code_entry() must be called when a invoke is resolved
1219 // on this method.
1220
1221 // It returns the compiled code entry point, after asserting not null.
1222 // This function is called after potential safepoints so that nmethod
1223 // or adapter that it points to is still live and valid.
1224 // This function must not hit a safepoint!
1225 address Method::verified_code_entry() {
1226 debug_only(NoSafepointVerifier nsv;)
1227 assert(_from_compiled_entry != NULL, "must be set");
1228 return _from_compiled_entry;
1229 }
1230
1231 address Method::verified_value_code_entry() {
1232 debug_only(NoSafepointVerifier nsv;)
1233 assert(_from_compiled_value_entry != NULL, "must be set");
1234 return _from_compiled_value_entry;
1235 }
1236
1237 address Method::verified_value_ro_code_entry() {
1238 debug_only(NoSafepointVerifier nsv;)
1239 assert(_from_compiled_value_ro_entry != NULL, "must be set");
1240 return _from_compiled_value_ro_entry;
1241 }
1242
1243 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1244 // (could be racing a deopt).
1245 // Not inline to avoid circular ref.
1246 bool Method::check_code() const {
1247 // cached in a register or local. There's a race on the value of the field.
1248 CompiledMethod *code = OrderAccess::load_acquire(&_code);
1249 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
1250 }
1251
1252 // Install compiled code. Instantly it can execute.
1253 void Method::set_code(const methodHandle& mh, CompiledMethod *code) {
1254 MutexLocker pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1255 assert( code, "use clear_code to remove code" );
1256 assert( mh->check_code(), "" );
1257
1258 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
1259
1260 // These writes must happen in this order, because the interpreter will
1261 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1262 // which jumps to _from_compiled_entry.
1263 mh->_code = code; // Assign before allowing compiled code to exec
1264
1265 int comp_level = code->comp_level();
1266 // In theory there could be a race here. In practice it is unlikely
1267 // and not worth worrying about.
1268 if (comp_level > mh->highest_comp_level()) {
1269 mh->set_highest_comp_level(comp_level);
1270 }
1271
1272 OrderAccess::storestore();
1273 mh->_from_compiled_entry = code->verified_entry_point();
1274 mh->_from_compiled_value_entry = code->verified_value_entry_point();
1275 mh->_from_compiled_value_ro_entry = code->verified_value_ro_entry_point();
1276 OrderAccess::storestore();
1277 // Instantly compiled code can execute.
1278 if (!mh->is_method_handle_intrinsic())
1279 mh->_from_interpreted_entry = mh->get_i2c_entry();
1280 }
1281
1282
1283 bool Method::is_overridden_in(Klass* k) const {
1284 InstanceKlass* ik = InstanceKlass::cast(k);
1285
1286 if (ik->is_interface()) return false;
1287
1288 // If method is an interface, we skip it - except if it
1289 // is a miranda method
1290 if (method_holder()->is_interface()) {
1291 // Check that method is not a miranda method
1292 if (ik->lookup_method(name(), signature()) == NULL) {
1293 // No implementation exist - so miranda method
1294 return false;
1295 }
1296 return true;
1297 }
1298
1299 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1300 if (!has_vtable_index()) {
1301 return false;
1302 } else {
1303 Method* vt_m = ik->method_at_vtable(vtable_index());
1304 return vt_m != this;
1305 }
1306 }
1307
1308
1309 // give advice about whether this Method* should be cached or not
1310 bool Method::should_not_be_cached() const {
1311 if (is_old()) {
1312 // This method has been redefined. It is either EMCP or obsolete
1313 // and we don't want to cache it because that would pin the method
1314 // down and prevent it from being collectible if and when it
1315 // finishes executing.
1316 return true;
1317 }
1318
1319 // caching this method should be just fine
1320 return false;
1321 }
1322
1323
1324 /**
1325 * Returns true if this is one of the specially treated methods for
1326 * security related stack walks (like Reflection.getCallerClass).
1327 */
1328 bool Method::is_ignored_by_security_stack_walk() const {
1329 if (intrinsic_id() == vmIntrinsics::_invoke) {
1330 // This is Method.invoke() -- ignore it
1331 return true;
1332 }
1333 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1334 // This is an auxilary frame -- ignore it
1335 return true;
1336 }
1337 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1338 // This is an internal adapter frame for method handles -- ignore it
1339 return true;
1340 }
1341 return false;
1342 }
1343
1344
1345 // Constant pool structure for invoke methods:
1346 enum {
1347 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1348 _imcp_invoke_signature, // utf8: (variable Symbol*)
1349 _imcp_limit
1350 };
1351
1352 // Test if this method is an MH adapter frame generated by Java code.
1353 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1354 bool Method::is_compiled_lambda_form() const {
1355 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1356 }
1357
1358 // Test if this method is an internal MH primitive method.
1359 bool Method::is_method_handle_intrinsic() const {
1360 vmIntrinsics::ID iid = intrinsic_id();
1361 return (MethodHandles::is_signature_polymorphic(iid) &&
1362 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1363 }
1364
1365 bool Method::has_member_arg() const {
1366 vmIntrinsics::ID iid = intrinsic_id();
1367 return (MethodHandles::is_signature_polymorphic(iid) &&
1368 MethodHandles::has_member_arg(iid));
1369 }
1370
1371 // Make an instance of a signature-polymorphic internal MH primitive.
1372 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1373 Symbol* signature,
1374 TRAPS) {
1375 ResourceMark rm;
1376 methodHandle empty;
1377
1378 InstanceKlass* holder = SystemDictionary::MethodHandle_klass();
1379 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1380 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1381 if (TraceMethodHandles) {
1382 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1383 }
1384
1385 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1386 name->increment_refcount();
1387 signature->increment_refcount();
1388
1389 int cp_length = _imcp_limit;
1390 ClassLoaderData* loader_data = holder->class_loader_data();
1391 constantPoolHandle cp;
1392 {
1393 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1394 cp = constantPoolHandle(THREAD, cp_oop);
1395 }
1396 cp->set_pool_holder(holder);
1397 cp->symbol_at_put(_imcp_invoke_name, name);
1398 cp->symbol_at_put(_imcp_invoke_signature, signature);
1399 cp->set_has_preresolution();
1400
1401 // decide on access bits: public or not?
1402 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1403 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1404 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1405 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1406
1407 methodHandle m;
1408 {
1409 InlineTableSizes sizes;
1410 Method* m_oop = Method::allocate(loader_data, 0,
1411 accessFlags_from(flags_bits), &sizes,
1412 ConstMethod::NORMAL, CHECK_(empty));
1413 m = methodHandle(THREAD, m_oop);
1414 }
1415 m->set_constants(cp());
1416 m->set_name_index(_imcp_invoke_name);
1417 m->set_signature_index(_imcp_invoke_signature);
1418 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1419 assert(m->signature() == signature, "");
1420 ResultTypeFinder rtf(signature);
1421 m->constMethod()->set_result_type(rtf.type());
1422 m->compute_size_of_parameters(THREAD);
1423 m->init_intrinsic_id();
1424 assert(m->is_method_handle_intrinsic(), "");
1425 #ifdef ASSERT
1426 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1427 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1428 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1429 #endif //ASSERT
1430
1431 // Finally, set up its entry points.
1432 assert(m->can_be_statically_bound(), "");
1433 m->set_vtable_index(Method::nonvirtual_vtable_index);
1434 m->link_method(m, CHECK_(empty));
1435
1436 if (TraceMethodHandles && (Verbose || WizardMode)) {
1437 ttyLocker ttyl;
1438 m->print_on(tty);
1439 }
1440
1441 return m;
1442 }
1443
1444 Klass* Method::check_non_bcp_klass(Klass* klass) {
1445 if (klass != NULL && klass->class_loader() != NULL) {
1446 if (klass->is_objArray_klass())
1447 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1448 return klass;
1449 }
1450 return NULL;
1451 }
1452
1453
1454 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1455 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1456 // Code below does not work for native methods - they should never get rewritten anyway
1457 assert(!m->is_native(), "cannot rewrite native methods");
1458 // Allocate new Method*
1459 AccessFlags flags = m->access_flags();
1460
1461 ConstMethod* cm = m->constMethod();
1462 int checked_exceptions_len = cm->checked_exceptions_length();
1463 int localvariable_len = cm->localvariable_table_length();
1464 int exception_table_len = cm->exception_table_length();
1465 int method_parameters_len = cm->method_parameters_length();
1466 int method_annotations_len = cm->method_annotations_length();
1467 int parameter_annotations_len = cm->parameter_annotations_length();
1468 int type_annotations_len = cm->type_annotations_length();
1469 int default_annotations_len = cm->default_annotations_length();
1470
1471 InlineTableSizes sizes(
1472 localvariable_len,
1473 new_compressed_linenumber_size,
1474 exception_table_len,
1475 checked_exceptions_len,
1476 method_parameters_len,
1477 cm->generic_signature_index(),
1478 method_annotations_len,
1479 parameter_annotations_len,
1480 type_annotations_len,
1481 default_annotations_len,
1482 0);
1483
1484 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1485 Method* newm_oop = Method::allocate(loader_data,
1486 new_code_length,
1487 flags,
1488 &sizes,
1489 m->method_type(),
1490 CHECK_(methodHandle()));
1491 methodHandle newm (THREAD, newm_oop);
1492
1493 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1494 ConstMethod* newcm = newm->constMethod();
1495 int new_const_method_size = newm->constMethod()->size();
1496
1497 // This works because the source and target are both Methods. Some compilers
1498 // (e.g., clang) complain that the target vtable pointer will be stomped,
1499 // so cast away newm()'s and m()'s Methodness.
1500 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1501
1502 // Create shallow copy of ConstMethod.
1503 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1504
1505 // Reset correct method/const method, method size, and parameter info
1506 newm->set_constMethod(newcm);
1507 newm->constMethod()->set_code_size(new_code_length);
1508 newm->constMethod()->set_constMethod_size(new_const_method_size);
1509 assert(newm->code_size() == new_code_length, "check");
1510 assert(newm->method_parameters_length() == method_parameters_len, "check");
1511 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1512 assert(newm->exception_table_length() == exception_table_len, "check");
1513 assert(newm->localvariable_table_length() == localvariable_len, "check");
1514 // Copy new byte codes
1515 memcpy(newm->code_base(), new_code, new_code_length);
1516 // Copy line number table
1517 if (new_compressed_linenumber_size > 0) {
1518 memcpy(newm->compressed_linenumber_table(),
1519 new_compressed_linenumber_table,
1520 new_compressed_linenumber_size);
1521 }
1522 // Copy method_parameters
1523 if (method_parameters_len > 0) {
1524 memcpy(newm->method_parameters_start(),
1525 m->method_parameters_start(),
1526 method_parameters_len * sizeof(MethodParametersElement));
1527 }
1528 // Copy checked_exceptions
1529 if (checked_exceptions_len > 0) {
1530 memcpy(newm->checked_exceptions_start(),
1531 m->checked_exceptions_start(),
1532 checked_exceptions_len * sizeof(CheckedExceptionElement));
1533 }
1534 // Copy exception table
1535 if (exception_table_len > 0) {
1536 memcpy(newm->exception_table_start(),
1537 m->exception_table_start(),
1538 exception_table_len * sizeof(ExceptionTableElement));
1539 }
1540 // Copy local variable number table
1541 if (localvariable_len > 0) {
1542 memcpy(newm->localvariable_table_start(),
1543 m->localvariable_table_start(),
1544 localvariable_len * sizeof(LocalVariableTableElement));
1545 }
1546 // Copy stackmap table
1547 if (m->has_stackmap_table()) {
1548 int code_attribute_length = m->stackmap_data()->length();
1549 Array<u1>* stackmap_data =
1550 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1551 memcpy((void*)stackmap_data->adr_at(0),
1552 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1553 newm->set_stackmap_data(stackmap_data);
1554 }
1555
1556 // copy annotations over to new method
1557 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL);
1558 return newm;
1559 }
1560
1561 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) {
1562 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1563 // because we are not loading from core libraries
1564 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1565 // which does not use the class default class loader so we check for its loader here
1566 const InstanceKlass* ik = InstanceKlass::cast(holder);
1567 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1568 return vmSymbols::NO_SID; // regardless of name, no intrinsics here
1569 }
1570
1571 // see if the klass name is well-known:
1572 Symbol* klass_name = ik->name();
1573 return vmSymbols::find_sid(klass_name);
1574 }
1575
1576 void Method::init_intrinsic_id() {
1577 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1578 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1579 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1580 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1581
1582 // the klass name is well-known:
1583 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1584 assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1585
1586 // ditto for method and signature:
1587 vmSymbols::SID name_id = vmSymbols::find_sid(name());
1588 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1589 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1590 && name_id == vmSymbols::NO_SID) {
1591 return;
1592 }
1593 vmSymbols::SID sig_id = vmSymbols::find_sid(signature());
1594 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1595 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1596 && sig_id == vmSymbols::NO_SID) {
1597 return;
1598 }
1599 jshort flags = access_flags().as_short();
1600
1601 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1602 if (id != vmIntrinsics::_none) {
1603 set_intrinsic_id(id);
1604 if (id == vmIntrinsics::_Class_cast) {
1605 // Even if the intrinsic is rejected, we want to inline this simple method.
1606 set_force_inline(true);
1607 }
1608 return;
1609 }
1610
1611 // A few slightly irregular cases:
1612 switch (klass_id) {
1613 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1614 // Second chance: check in regular Math.
1615 switch (name_id) {
1616 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1617 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1618 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1619 // pretend it is the corresponding method in the non-strict class:
1620 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1621 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1622 break;
1623 default:
1624 break;
1625 }
1626 break;
1627
1628 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1629 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1630 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1631 if (!is_native()) break;
1632 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1633 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1634 id = vmIntrinsics::_none;
1635 break;
1636
1637 default:
1638 break;
1639 }
1640
1641 if (id != vmIntrinsics::_none) {
1642 // Set up its iid. It is an alias method.
1643 set_intrinsic_id(id);
1644 return;
1645 }
1646 }
1647
1648 // These two methods are static since a GC may move the Method
1649 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1650 if (!THREAD->can_call_java()) {
1651 // There is nothing useful this routine can do from within the Compile thread.
1652 // Hopefully, the signature contains only well-known classes.
1653 // We could scan for this and return true/false, but the caller won't care.
1654 return false;
1655 }
1656 bool sig_is_loaded = true;
1657 Handle class_loader(THREAD, m->method_holder()->class_loader());
1658 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1659 ResourceMark rm(THREAD);
1660 Symbol* signature = m->signature();
1661 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1662 if (ss.is_object()) {
1663 Symbol* sym = ss.as_symbol();
1664 Symbol* name = sym;
1665 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1666 protection_domain, THREAD);
1667 // We are loading classes eagerly. If a ClassNotFoundException or
1668 // a LinkageError was generated, be sure to ignore it.
1669 if (HAS_PENDING_EXCEPTION) {
1670 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1671 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1672 CLEAR_PENDING_EXCEPTION;
1673 } else {
1674 return false;
1675 }
1676 }
1677 if( klass == NULL) { sig_is_loaded = false; }
1678 }
1679 }
1680 return sig_is_loaded;
1681 }
1682
1683 bool Method::has_unloaded_classes_in_signature(const methodHandle& m, TRAPS) {
1684 Handle class_loader(THREAD, m->method_holder()->class_loader());
1685 Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1686 ResourceMark rm(THREAD);
1687 Symbol* signature = m->signature();
1688 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1689 if (ss.type() == T_OBJECT) {
1690 Symbol* name = ss.as_symbol_or_null();
1691 if (name == NULL) return true;
1692 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1693 if (klass == NULL) return true;
1694 }
1695 }
1696 return false;
1697 }
1698
1699 // Exposed so field engineers can debug VM
1700 void Method::print_short_name(outputStream* st) {
1701 ResourceMark rm;
1702 #ifdef PRODUCT
1703 st->print(" %s::", method_holder()->external_name());
1704 #else
1705 st->print(" %s::", method_holder()->internal_name());
1706 #endif
1707 name()->print_symbol_on(st);
1708 if (WizardMode) signature()->print_symbol_on(st);
1709 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1710 MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1711 }
1712
1713 // Comparer for sorting an object array containing
1714 // Method*s.
1715 static int method_comparator(Method* a, Method* b) {
1716 return a->name()->fast_compare(b->name());
1717 }
1718
1719 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1720 // default_methods also uses this without the ordering for fast find_method
1721 void Method::sort_methods(Array<Method*>* methods, bool set_idnums) {
1722 int length = methods->length();
1723 if (length > 1) {
1724 {
1725 NoSafepointVerifier nsv;
1726 QuickSort::sort(methods->data(), length, method_comparator, /*idempotent=*/false);
1727 }
1728 // Reset method ordering
1729 if (set_idnums) {
1730 for (int i = 0; i < length; i++) {
1731 Method* m = methods->at(i);
1732 m->set_method_idnum(i);
1733 m->set_orig_method_idnum(i);
1734 }
1735 }
1736 }
1737 }
1738
1739 //-----------------------------------------------------------------------------------
1740 // Non-product code unless JVM/TI needs it
1741
1742 #if !defined(PRODUCT) || INCLUDE_JVMTI
1743 class SignatureTypePrinter : public SignatureTypeNames {
1744 private:
1745 outputStream* _st;
1746 bool _use_separator;
1747
1748 void type_name(const char* name) {
1749 if (_use_separator) _st->print(", ");
1750 _st->print("%s", name);
1751 _use_separator = true;
1752 }
1753
1754 public:
1755 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1756 _st = st;
1757 _use_separator = false;
1758 }
1759
1760 void print_parameters() { _use_separator = false; iterate_parameters(); }
1761 void print_returntype() { _use_separator = false; iterate_returntype(); }
1762 };
1763
1764
1765 void Method::print_name(outputStream* st) {
1766 Thread *thread = Thread::current();
1767 ResourceMark rm(thread);
1768 st->print("%s ", is_static() ? "static" : "virtual");
1769 if (WizardMode) {
1770 st->print("%s.", method_holder()->internal_name());
1771 name()->print_symbol_on(st);
1772 signature()->print_symbol_on(st);
1773 } else {
1774 SignatureTypePrinter sig(signature(), st);
1775 sig.print_returntype();
1776 st->print(" %s.", method_holder()->internal_name());
1777 name()->print_symbol_on(st);
1778 st->print("(");
1779 sig.print_parameters();
1780 st->print(")");
1781 }
1782 }
1783 #endif // !PRODUCT || INCLUDE_JVMTI
1784
1785
1786 void Method::print_codes_on(outputStream* st) const {
1787 print_codes_on(0, code_size(), st);
1788 }
1789
1790 void Method::print_codes_on(int from, int to, outputStream* st) const {
1791 Thread *thread = Thread::current();
1792 ResourceMark rm(thread);
1793 methodHandle mh (thread, (Method*)this);
1794 BytecodeStream s(mh);
1795 s.set_interval(from, to);
1796 BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1797 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1798 }
1799
1800 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1801 _bci = 0;
1802 _line = 0;
1803 };
1804
1805 bool CompressedLineNumberReadStream::read_pair() {
1806 jubyte next = read_byte();
1807 // Check for terminator
1808 if (next == 0) return false;
1809 if (next == 0xFF) {
1810 // Escape character, regular compression used
1811 _bci += read_signed_int();
1812 _line += read_signed_int();
1813 } else {
1814 // Single byte compression used
1815 _bci += next >> 3;
1816 _line += next & 0x7;
1817 }
1818 return true;
1819 }
1820
1821 #if INCLUDE_JVMTI
1822
1823 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1824 BreakpointInfo* bp = method_holder()->breakpoints();
1825 for (; bp != NULL; bp = bp->next()) {
1826 if (bp->match(this, bci)) {
1827 return bp->orig_bytecode();
1828 }
1829 }
1830 {
1831 ResourceMark rm;
1832 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1833 }
1834 return Bytecodes::_shouldnotreachhere;
1835 }
1836
1837 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1838 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1839 BreakpointInfo* bp = method_holder()->breakpoints();
1840 for (; bp != NULL; bp = bp->next()) {
1841 if (bp->match(this, bci)) {
1842 bp->set_orig_bytecode(code);
1843 // and continue, in case there is more than one
1844 }
1845 }
1846 }
1847
1848 void Method::set_breakpoint(int bci) {
1849 InstanceKlass* ik = method_holder();
1850 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1851 bp->set_next(ik->breakpoints());
1852 ik->set_breakpoints(bp);
1853 // do this last:
1854 bp->set(this);
1855 }
1856
1857 static void clear_matches(Method* m, int bci) {
1858 InstanceKlass* ik = m->method_holder();
1859 BreakpointInfo* prev_bp = NULL;
1860 BreakpointInfo* next_bp;
1861 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1862 next_bp = bp->next();
1863 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1864 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1865 // do this first:
1866 bp->clear(m);
1867 // unhook it
1868 if (prev_bp != NULL)
1869 prev_bp->set_next(next_bp);
1870 else
1871 ik->set_breakpoints(next_bp);
1872 delete bp;
1873 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1874 // at same location. So we have multiple matching (method_index and bci)
1875 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1876 // breakpoint for clear_breakpoint request and keep all other method versions
1877 // BreakpointInfo for future clear_breakpoint request.
1878 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1879 // which is being called when class is unloaded. We delete all the Breakpoint
1880 // information for all versions of method. We may not correctly restore the original
1881 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1882 // so these methods won't be used anymore.
1883 if (bci >= 0) {
1884 break;
1885 }
1886 } else {
1887 // This one is a keeper.
1888 prev_bp = bp;
1889 }
1890 }
1891 }
1892
1893 void Method::clear_breakpoint(int bci) {
1894 assert(bci >= 0, "");
1895 clear_matches(this, bci);
1896 }
1897
1898 void Method::clear_all_breakpoints() {
1899 clear_matches(this, -1);
1900 }
1901
1902 #endif // INCLUDE_JVMTI
1903
1904 int Method::invocation_count() {
1905 MethodCounters *mcs = method_counters();
1906 if (TieredCompilation) {
1907 MethodData* const mdo = method_data();
1908 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1909 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1910 return InvocationCounter::count_limit;
1911 } else {
1912 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1913 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1914 }
1915 } else {
1916 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1917 }
1918 }
1919
1920 int Method::backedge_count() {
1921 MethodCounters *mcs = method_counters();
1922 if (TieredCompilation) {
1923 MethodData* const mdo = method_data();
1924 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1925 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1926 return InvocationCounter::count_limit;
1927 } else {
1928 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1929 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1930 }
1931 } else {
1932 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1933 }
1934 }
1935
1936 int Method::highest_comp_level() const {
1937 const MethodCounters* mcs = method_counters();
1938 if (mcs != NULL) {
1939 return mcs->highest_comp_level();
1940 } else {
1941 return CompLevel_none;
1942 }
1943 }
1944
1945 int Method::highest_osr_comp_level() const {
1946 const MethodCounters* mcs = method_counters();
1947 if (mcs != NULL) {
1948 return mcs->highest_osr_comp_level();
1949 } else {
1950 return CompLevel_none;
1951 }
1952 }
1953
1954 void Method::set_highest_comp_level(int level) {
1955 MethodCounters* mcs = method_counters();
1956 if (mcs != NULL) {
1957 mcs->set_highest_comp_level(level);
1958 }
1959 }
1960
1961 void Method::set_highest_osr_comp_level(int level) {
1962 MethodCounters* mcs = method_counters();
1963 if (mcs != NULL) {
1964 mcs->set_highest_osr_comp_level(level);
1965 }
1966 }
1967
1968 #if INCLUDE_JVMTI
1969
1970 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1971 _bci = bci;
1972 _name_index = m->name_index();
1973 _signature_index = m->signature_index();
1974 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1975 if (_orig_bytecode == Bytecodes::_breakpoint)
1976 _orig_bytecode = m->orig_bytecode_at(_bci);
1977 _next = NULL;
1978 }
1979
1980 void BreakpointInfo::set(Method* method) {
1981 #ifdef ASSERT
1982 {
1983 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1984 if (code == Bytecodes::_breakpoint)
1985 code = method->orig_bytecode_at(_bci);
1986 assert(orig_bytecode() == code, "original bytecode must be the same");
1987 }
1988 #endif
1989 Thread *thread = Thread::current();
1990 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1991 method->incr_number_of_breakpoints(thread);
1992 {
1993 // Deoptimize all dependents on this method
1994 HandleMark hm(thread);
1995 methodHandle mh(thread, method);
1996 CodeCache::flush_dependents_on_method(mh);
1997 }
1998 }
1999
2000 void BreakpointInfo::clear(Method* method) {
2001 *method->bcp_from(_bci) = orig_bytecode();
2002 assert(method->number_of_breakpoints() > 0, "must not go negative");
2003 method->decr_number_of_breakpoints(Thread::current());
2004 }
2005
2006 #endif // INCLUDE_JVMTI
2007
2008 // jmethodID handling
2009
2010 // This is a block allocating object, sort of like JNIHandleBlock, only a
2011 // lot simpler.
2012 // It's allocated on the CHeap because once we allocate a jmethodID, we can
2013 // never get rid of it.
2014
2015 static const int min_block_size = 8;
2016
2017 class JNIMethodBlockNode : public CHeapObj<mtClass> {
2018 friend class JNIMethodBlock;
2019 Method** _methods;
2020 int _number_of_methods;
2021 int _top;
2022 JNIMethodBlockNode* _next;
2023
2024 public:
2025
2026 JNIMethodBlockNode(int num_methods = min_block_size);
2027
2028 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
2029
2030 void ensure_methods(int num_addl_methods) {
2031 if (_top < _number_of_methods) {
2032 num_addl_methods -= _number_of_methods - _top;
2033 if (num_addl_methods <= 0) {
2034 return;
2035 }
2036 }
2037 if (_next == NULL) {
2038 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2039 } else {
2040 _next->ensure_methods(num_addl_methods);
2041 }
2042 }
2043 };
2044
2045 class JNIMethodBlock : public CHeapObj<mtClass> {
2046 JNIMethodBlockNode _head;
2047 JNIMethodBlockNode *_last_free;
2048 public:
2049 static Method* const _free_method;
2050
2051 JNIMethodBlock(int initial_capacity = min_block_size)
2052 : _head(initial_capacity), _last_free(&_head) {}
2053
2054 void ensure_methods(int num_addl_methods) {
2055 _last_free->ensure_methods(num_addl_methods);
2056 }
2057
2058 Method** add_method(Method* m) {
2059 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) {
2060 if (b->_top < b->_number_of_methods) {
2061 // top points to the next free entry.
2062 int i = b->_top;
2063 b->_methods[i] = m;
2064 b->_top++;
2065 _last_free = b;
2066 return &(b->_methods[i]);
2067 } else if (b->_top == b->_number_of_methods) {
2068 // if the next free entry ran off the block see if there's a free entry
2069 for (int i = 0; i < b->_number_of_methods; i++) {
2070 if (b->_methods[i] == _free_method) {
2071 b->_methods[i] = m;
2072 _last_free = b;
2073 return &(b->_methods[i]);
2074 }
2075 }
2076 // Only check each block once for frees. They're very unlikely.
2077 // Increment top past the end of the block.
2078 b->_top++;
2079 }
2080 // need to allocate a next block.
2081 if (b->_next == NULL) {
2082 b->_next = _last_free = new JNIMethodBlockNode();
2083 }
2084 }
2085 guarantee(false, "Should always allocate a free block");
2086 return NULL;
2087 }
2088
2089 bool contains(Method** m) {
2090 if (m == NULL) return false;
2091 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2092 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2093 // This is a bit of extra checking, for two reasons. One is
2094 // that contains() deals with pointers that are passed in by
2095 // JNI code, so making sure that the pointer is aligned
2096 // correctly is valuable. The other is that <= and > are
2097 // technically not defined on pointers, so the if guard can
2098 // pass spuriously; no modern compiler is likely to make that
2099 // a problem, though (and if one did, the guard could also
2100 // fail spuriously, which would be bad).
2101 ptrdiff_t idx = m - b->_methods;
2102 if (b->_methods + idx == m) {
2103 return true;
2104 }
2105 }
2106 }
2107 return false; // not found
2108 }
2109
2110 // Doesn't really destroy it, just marks it as free so it can be reused.
2111 void destroy_method(Method** m) {
2112 #ifdef ASSERT
2113 assert(contains(m), "should be a methodID");
2114 #endif // ASSERT
2115 *m = _free_method;
2116 }
2117
2118 // During class unloading the methods are cleared, which is different
2119 // than freed.
2120 void clear_all_methods() {
2121 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2122 for (int i = 0; i< b->_number_of_methods; i++) {
2123 b->_methods[i] = NULL;
2124 }
2125 }
2126 }
2127 #ifndef PRODUCT
2128 int count_methods() {
2129 // count all allocated methods
2130 int count = 0;
2131 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2132 for (int i = 0; i< b->_number_of_methods; i++) {
2133 if (b->_methods[i] != _free_method) count++;
2134 }
2135 }
2136 return count;
2137 }
2138 #endif // PRODUCT
2139 };
2140
2141 // Something that can't be mistaken for an address or a markWord
2142 Method* const JNIMethodBlock::_free_method = (Method*)55;
2143
2144 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(NULL) {
2145 _number_of_methods = MAX2(num_methods, min_block_size);
2146 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2147 for (int i = 0; i < _number_of_methods; i++) {
2148 _methods[i] = JNIMethodBlock::_free_method;
2149 }
2150 }
2151
2152 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
2153 ClassLoaderData* cld = loader_data;
2154 if (!SafepointSynchronize::is_at_safepoint()) {
2155 // Have to add jmethod_ids() to class loader data thread-safely.
2156 // Also have to add the method to the list safely, which the cld lock
2157 // protects as well.
2158 MutexLocker ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2159 if (cld->jmethod_ids() == NULL) {
2160 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2161 } else {
2162 cld->jmethod_ids()->ensure_methods(capacity);
2163 }
2164 } else {
2165 // At safepoint, we are single threaded and can set this.
2166 if (cld->jmethod_ids() == NULL) {
2167 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2168 } else {
2169 cld->jmethod_ids()->ensure_methods(capacity);
2170 }
2171 }
2172 }
2173
2174 // Add a method id to the jmethod_ids
2175 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
2176 ClassLoaderData* cld = loader_data;
2177
2178 if (!SafepointSynchronize::is_at_safepoint()) {
2179 // Have to add jmethod_ids() to class loader data thread-safely.
2180 // Also have to add the method to the list safely, which the cld lock
2181 // protects as well.
2182 MutexLocker ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag);
2183 if (cld->jmethod_ids() == NULL) {
2184 cld->set_jmethod_ids(new JNIMethodBlock());
2185 }
2186 // jmethodID is a pointer to Method*
2187 return (jmethodID)cld->jmethod_ids()->add_method(m);
2188 } else {
2189 // At safepoint, we are single threaded and can set this.
2190 if (cld->jmethod_ids() == NULL) {
2191 cld->set_jmethod_ids(new JNIMethodBlock());
2192 }
2193 // jmethodID is a pointer to Method*
2194 return (jmethodID)cld->jmethod_ids()->add_method(m);
2195 }
2196 }
2197
2198 // Mark a jmethodID as free. This is called when there is a data race in
2199 // InstanceKlass while creating the jmethodID cache.
2200 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
2201 ClassLoaderData* cld = loader_data;
2202 Method** ptr = (Method**)m;
2203 assert(cld->jmethod_ids() != NULL, "should have method handles");
2204 cld->jmethod_ids()->destroy_method(ptr);
2205 }
2206
2207 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2208 // Can't assert the method_holder is the same because the new method has the
2209 // scratch method holder.
2210 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2211 == new_method->method_holder()->class_loader() ||
2212 new_method->method_holder()->class_loader() == NULL, // allow Unsafe substitution
2213 "changing to a different class loader");
2214 // Just change the method in place, jmethodID pointer doesn't change.
2215 *((Method**)jmid) = new_method;
2216 }
2217
2218 bool Method::is_method_id(jmethodID mid) {
2219 Method* m = resolve_jmethod_id(mid);
2220 assert(m != NULL, "should be called with non-null method");
2221 InstanceKlass* ik = m->method_holder();
2222 ClassLoaderData* cld = ik->class_loader_data();
2223 if (cld->jmethod_ids() == NULL) return false;
2224 return (cld->jmethod_ids()->contains((Method**)mid));
2225 }
2226
2227 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2228 if (mid == NULL) return NULL;
2229 Method* o = resolve_jmethod_id(mid);
2230 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
2231 return NULL;
2232 }
2233 return o;
2234 };
2235
2236 void Method::set_on_stack(const bool value) {
2237 // Set both the method itself and its constant pool. The constant pool
2238 // on stack means some method referring to it is also on the stack.
2239 constants()->set_on_stack(value);
2240
2241 bool already_set = on_stack();
2242 _access_flags.set_on_stack(value);
2243 if (value && !already_set) {
2244 MetadataOnStackMark::record(this);
2245 }
2246 assert(!value || !is_old() || is_obsolete() || is_running_emcp(),
2247 "emcp methods cannot run after emcp bit is cleared");
2248 }
2249
2250 // Called when the class loader is unloaded to make all methods weak.
2251 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2252 loader_data->jmethod_ids()->clear_all_methods();
2253 }
2254
2255 bool Method::has_method_vptr(const void* ptr) {
2256 Method m;
2257 // This assumes that the vtbl pointer is the first word of a C++ object.
2258 return dereference_vptr(&m) == dereference_vptr(ptr);
2259 }
2260
2261 // Check that this pointer is valid by checking that the vtbl pointer matches
2262 bool Method::is_valid_method(const Method* m) {
2263 if (m == NULL) {
2264 return false;
2265 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2266 // Quick sanity check on pointer.
2267 return false;
2268 } else if (m->is_shared()) {
2269 return MetaspaceShared::is_valid_shared_method(m);
2270 } else if (Metaspace::contains_non_shared(m)) {
2271 return has_method_vptr((const void*)m);
2272 } else {
2273 return false;
2274 }
2275 }
2276
2277 #ifndef PRODUCT
2278 void Method::print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) {
2279 out->print(" jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
2280 }
2281 #endif // PRODUCT
2282
2283
2284 // Printing
2285
2286 #ifndef PRODUCT
2287
2288 void Method::print_on(outputStream* st) const {
2289 ResourceMark rm;
2290 assert(is_method(), "must be method");
2291 st->print_cr("%s", internal_name());
2292 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this));
2293 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2294 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants()));
2295 constants()->print_value_on(st); st->cr();
2296 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2297 st->print (" - name: "); name()->print_value_on(st); st->cr();
2298 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2299 st->print_cr(" - max stack: %d", max_stack());
2300 st->print_cr(" - max locals: %d", max_locals());
2301 st->print_cr(" - size of params: %d", size_of_parameters());
2302 st->print_cr(" - method size: %d", method_size());
2303 if (intrinsic_id() != vmIntrinsics::_none)
2304 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
2305 if (highest_comp_level() != CompLevel_none)
2306 st->print_cr(" - highest level: %d", highest_comp_level());
2307 st->print_cr(" - vtable index: %d", _vtable_index);
2308 if (valid_itable_index())
2309 st->print_cr(" - itable index: %d", itable_index());
2310 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry()));
2311 st->print( " - adapters: ");
2312 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2313 if (a == NULL)
2314 st->print_cr(INTPTR_FORMAT, p2i(a));
2315 else
2316 a->print_adapter_on(st);
2317 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry()));
2318 st->print_cr(" - code size: %d", code_size());
2319 if (code_size() != 0) {
2320 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base()));
2321 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size()));
2322 }
2323 if (method_data() != NULL) {
2324 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data()));
2325 }
2326 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2327 if (checked_exceptions_length() > 0) {
2328 CheckedExceptionElement* table = checked_exceptions_start();
2329 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table));
2330 if (Verbose) {
2331 for (int i = 0; i < checked_exceptions_length(); i++) {
2332 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2333 }
2334 }
2335 }
2336 if (has_linenumber_table()) {
2337 u_char* table = compressed_linenumber_table();
2338 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table));
2339 if (Verbose) {
2340 CompressedLineNumberReadStream stream(table);
2341 while (stream.read_pair()) {
2342 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2343 }
2344 }
2345 }
2346 st->print_cr(" - localvar length: %d", localvariable_table_length());
2347 if (localvariable_table_length() > 0) {
2348 LocalVariableTableElement* table = localvariable_table_start();
2349 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table));
2350 if (Verbose) {
2351 for (int i = 0; i < localvariable_table_length(); i++) {
2352 int bci = table[i].start_bci;
2353 int len = table[i].length;
2354 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2355 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2356 int slot = table[i].slot;
2357 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2358 }
2359 }
2360 }
2361 if (code() != NULL) {
2362 st->print (" - compiled code: ");
2363 code()->print_value_on(st);
2364 }
2365 if (is_native()) {
2366 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function()));
2367 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler()));
2368 }
2369 }
2370
2371 void Method::print_linkage_flags(outputStream* st) {
2372 access_flags().print_on(st);
2373 if (is_default_method()) {
2374 st->print("default ");
2375 }
2376 if (is_overpass()) {
2377 st->print("overpass ");
2378 }
2379 }
2380 #endif //PRODUCT
2381
2382 void Method::print_value_on(outputStream* st) const {
2383 assert(is_method(), "must be method");
2384 st->print("%s", internal_name());
2385 print_address_on(st);
2386 st->print(" ");
2387 if (WizardMode) access_flags().print_on(st);
2388 name()->print_value_on(st);
2389 st->print(" ");
2390 signature()->print_value_on(st);
2391 st->print(" in ");
2392 method_holder()->print_value_on(st);
2393 if (WizardMode) st->print("#%d", _vtable_index);
2394 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2395 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2396 }
2397
2398 #if INCLUDE_SERVICES
2399 // Size Statistics
2400 void Method::collect_statistics(KlassSizeStats *sz) const {
2401 int mysize = sz->count(this);
2402 sz->_method_bytes += mysize;
2403 sz->_method_all_bytes += mysize;
2404 sz->_rw_bytes += mysize;
2405
2406 if (constMethod()) {
2407 constMethod()->collect_statistics(sz);
2408 }
2409 if (method_data()) {
2410 method_data()->collect_statistics(sz);
2411 }
2412 }
2413 #endif // INCLUDE_SERVICES
2414
2415 // LogTouchedMethods and PrintTouchedMethods
2416
2417 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because
2418 // the Method may be garbage collected. Let's roll our own hash table.
2419 class TouchedMethodRecord : CHeapObj<mtTracing> {
2420 public:
2421 // It's OK to store Symbols here because they will NOT be GC'ed if
2422 // LogTouchedMethods is enabled.
2423 TouchedMethodRecord* _next;
2424 Symbol* _class_name;
2425 Symbol* _method_name;
2426 Symbol* _method_signature;
2427 };
2428
2429 static const int TOUCHED_METHOD_TABLE_SIZE = 20011;
2430 static TouchedMethodRecord** _touched_method_table = NULL;
2431
2432 void Method::log_touched(TRAPS) {
2433
2434 const int table_size = TOUCHED_METHOD_TABLE_SIZE;
2435 Symbol* my_class = klass_name();
2436 Symbol* my_name = name();
2437 Symbol* my_sig = signature();
2438
2439 unsigned int hash = my_class->identity_hash() +
2440 my_name->identity_hash() +
2441 my_sig->identity_hash();
2442 juint index = juint(hash) % table_size;
2443
2444 MutexLocker ml(TouchedMethodLog_lock, THREAD);
2445 if (_touched_method_table == NULL) {
2446 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size,
2447 mtTracing, CURRENT_PC);
2448 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size);
2449 }
2450
2451 TouchedMethodRecord* ptr = _touched_method_table[index];
2452 while (ptr) {
2453 if (ptr->_class_name == my_class &&
2454 ptr->_method_name == my_name &&
2455 ptr->_method_signature == my_sig) {
2456 return;
2457 }
2458 if (ptr->_next == NULL) break;
2459 ptr = ptr->_next;
2460 }
2461 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing);
2462 my_class->increment_refcount();
2463 my_name->increment_refcount();
2464 my_sig->increment_refcount();
2465 nptr->_class_name = my_class;
2466 nptr->_method_name = my_name;
2467 nptr->_method_signature = my_sig;
2468 nptr->_next = NULL;
2469
2470 if (ptr == NULL) {
2471 // first
2472 _touched_method_table[index] = nptr;
2473 } else {
2474 ptr->_next = nptr;
2475 }
2476 }
2477
2478 void Method::print_touched_methods(outputStream* out) {
2479 MutexLocker ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock);
2480 out->print_cr("# Method::print_touched_methods version 1");
2481 if (_touched_method_table) {
2482 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) {
2483 TouchedMethodRecord* ptr = _touched_method_table[i];
2484 while(ptr) {
2485 ptr->_class_name->print_symbol_on(out); out->print(".");
2486 ptr->_method_name->print_symbol_on(out); out->print(":");
2487 ptr->_method_signature->print_symbol_on(out); out->cr();
2488 ptr = ptr->_next;
2489 }
2490 }
2491 }
2492 }
2493
2494 // Verification
2495
2496 void Method::verify_on(outputStream* st) {
2497 guarantee(is_method(), "object must be method");
2498 guarantee(constants()->is_constantPool(), "should be constant pool");
2499 MethodData* md = method_data();
2500 guarantee(md == NULL ||
2501 md->is_methodData(), "should be method data");
2502 }