1 /*
2 * Copyright 1999-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_ciMethod.cpp.incl"
27
28 // ciMethod
29 //
30 // This class represents a methodOop in the HotSpot virtual
31 // machine.
32
33
34 // ------------------------------------------------------------------
35 // ciMethod::ciMethod
36 //
37 // Loaded method.
38 ciMethod::ciMethod(methodHandle h_m) : ciObject(h_m) {
39 assert(h_m() != NULL, "no null method");
40
41 // These fields are always filled in in loaded methods.
42 _flags = ciFlags(h_m()->access_flags());
43
44 // Easy to compute, so fill them in now.
45 _max_stack = h_m()->max_stack();
46 _max_locals = h_m()->max_locals();
47 _code_size = h_m()->code_size();
48 _intrinsic_id = h_m()->intrinsic_id();
49 _handler_count = h_m()->exception_table()->length() / 4;
50 _uses_monitors = h_m()->access_flags().has_monitor_bytecodes();
51 _balanced_monitors = !_uses_monitors || h_m()->access_flags().is_monitor_matching();
52 _is_compilable = !h_m()->is_not_compilable();
53 // Lazy fields, filled in on demand. Require allocation.
54 _code = NULL;
55 _exception_handlers = NULL;
56 _liveness = NULL;
57 _bcea = NULL;
58 _method_blocks = NULL;
59 #ifdef COMPILER2
60 _flow = NULL;
61 #endif // COMPILER2
62
63 ciEnv *env = CURRENT_ENV;
64 if (env->jvmti_can_hotswap_or_post_breakpoint() && _is_compilable) {
65 // 6328518 check hotswap conditions under the right lock.
66 MutexLocker locker(Compile_lock);
67 if (Dependencies::check_evol_method(h_m()) != NULL) {
68 _is_compilable = false;
69 }
70 } else {
71 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
72 }
73
74 if (instanceKlass::cast(h_m()->method_holder())->is_linked()) {
75 _can_be_statically_bound = h_m()->can_be_statically_bound();
76 } else {
77 // Have to use a conservative value in this case.
78 _can_be_statically_bound = false;
79 }
80
81 // Adjust the definition of this condition to be more useful:
82 // %%% take these conditions into account in vtable generation
83 if (!_can_be_statically_bound && h_m()->is_private())
84 _can_be_statically_bound = true;
85 if (_can_be_statically_bound && h_m()->is_abstract())
86 _can_be_statically_bound = false;
87
88 // generating _signature may allow GC and therefore move m.
89 // These fields are always filled in.
90 _name = env->get_object(h_m()->name())->as_symbol();
91 _holder = env->get_object(h_m()->method_holder())->as_instance_klass();
92 ciSymbol* sig_symbol = env->get_object(h_m()->signature())->as_symbol();
93 _signature = new (env->arena()) ciSignature(_holder, sig_symbol);
94 _method_data = NULL;
95 // Take a snapshot of these values, so they will be commensurate with the MDO.
96 if (ProfileInterpreter) {
97 int invcnt = h_m()->interpreter_invocation_count();
98 // if the value overflowed report it as max int
99 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
100 _interpreter_throwout_count = h_m()->interpreter_throwout_count();
101 } else {
102 _interpreter_invocation_count = 0;
103 _interpreter_throwout_count = 0;
104 }
105 if (_interpreter_invocation_count == 0)
106 _interpreter_invocation_count = 1;
107 }
108
109
110 // ------------------------------------------------------------------
111 // ciMethod::ciMethod
112 //
113 // Unloaded method.
114 ciMethod::ciMethod(ciInstanceKlass* holder,
115 ciSymbol* name,
116 ciSymbol* signature) : ciObject(ciMethodKlass::make()) {
117 // These fields are always filled in.
118 _name = name;
119 _holder = holder;
120 _signature = new (CURRENT_ENV->arena()) ciSignature(_holder, signature);
121 _intrinsic_id = vmIntrinsics::_none;
122 _liveness = NULL;
123 _can_be_statically_bound = false;
124 _bcea = NULL;
125 _method_blocks = NULL;
126 _method_data = NULL;
127 #ifdef COMPILER2
128 _flow = NULL;
129 #endif // COMPILER2
130 }
131
132
133 // ------------------------------------------------------------------
134 // ciMethod::load_code
135 //
136 // Load the bytecodes and exception handler table for this method.
137 void ciMethod::load_code() {
138 VM_ENTRY_MARK;
139 assert(is_loaded(), "only loaded methods have code");
140
141 methodOop me = get_methodOop();
142 Arena* arena = CURRENT_THREAD_ENV->arena();
143
144 // Load the bytecodes.
145 _code = (address)arena->Amalloc(code_size());
146 memcpy(_code, me->code_base(), code_size());
147
148 // Revert any breakpoint bytecodes in ci's copy
149 if (me->number_of_breakpoints() > 0) {
150 BreakpointInfo* bp = instanceKlass::cast(me->method_holder())->breakpoints();
151 for (; bp != NULL; bp = bp->next()) {
152 if (bp->match(me)) {
153 code_at_put(bp->bci(), bp->orig_bytecode());
154 }
155 }
156 }
157
158 // And load the exception table.
159 typeArrayOop exc_table = me->exception_table();
160
161 // Allocate one extra spot in our list of exceptions. This
162 // last entry will be used to represent the possibility that
163 // an exception escapes the method. See ciExceptionHandlerStream
164 // for details.
165 _exception_handlers =
166 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
167 * (_handler_count + 1));
168 if (_handler_count > 0) {
169 for (int i=0; i<_handler_count; i++) {
170 int base = i*4;
171 _exception_handlers[i] = new (arena) ciExceptionHandler(
172 holder(),
173 /* start */ exc_table->int_at(base),
174 /* limit */ exc_table->int_at(base+1),
175 /* goto pc */ exc_table->int_at(base+2),
176 /* cp index */ exc_table->int_at(base+3));
177 }
178 }
179
180 // Put an entry at the end of our list to represent the possibility
181 // of exceptional exit.
182 _exception_handlers[_handler_count] =
183 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
184
185 if (CIPrintMethodCodes) {
186 print_codes();
187 }
188 }
189
190
191 // ------------------------------------------------------------------
192 // ciMethod::has_linenumber_table
193 //
194 // length unknown until decompression
195 bool ciMethod::has_linenumber_table() const {
196 check_is_loaded();
197 VM_ENTRY_MARK;
198 return get_methodOop()->has_linenumber_table();
199 }
200
201
202 // ------------------------------------------------------------------
203 // ciMethod::compressed_linenumber_table
204 u_char* ciMethod::compressed_linenumber_table() const {
205 check_is_loaded();
206 VM_ENTRY_MARK;
207 return get_methodOop()->compressed_linenumber_table();
208 }
209
210
211 // ------------------------------------------------------------------
212 // ciMethod::line_number_from_bci
213 int ciMethod::line_number_from_bci(int bci) const {
214 check_is_loaded();
215 VM_ENTRY_MARK;
216 return get_methodOop()->line_number_from_bci(bci);
217 }
218
219
220 // ------------------------------------------------------------------
221 // ciMethod::vtable_index
222 //
223 // Get the position of this method's entry in the vtable, if any.
224 int ciMethod::vtable_index() {
225 check_is_loaded();
226 assert(holder()->is_linked(), "must be linked");
227 VM_ENTRY_MARK;
228 return get_methodOop()->vtable_index();
229 }
230
231
232 // ------------------------------------------------------------------
233 // ciMethod::native_entry
234 //
235 // Get the address of this method's native code, if any.
236 address ciMethod::native_entry() {
237 check_is_loaded();
238 assert(flags().is_native(), "must be native method");
239 VM_ENTRY_MARK;
240 methodOop method = get_methodOop();
241 address entry = method->native_function();
242 assert(entry != NULL, "must be valid entry point");
243 return entry;
244 }
245
246
247 // ------------------------------------------------------------------
248 // ciMethod::interpreter_entry
249 //
250 // Get the entry point for running this method in the interpreter.
251 address ciMethod::interpreter_entry() {
252 check_is_loaded();
253 VM_ENTRY_MARK;
254 methodHandle mh(THREAD, get_methodOop());
255 return Interpreter::entry_for_method(mh);
256 }
257
258
259 // ------------------------------------------------------------------
260 // ciMethod::uses_balanced_monitors
261 //
262 // Does this method use monitors in a strict stack-disciplined manner?
263 bool ciMethod::has_balanced_monitors() {
264 check_is_loaded();
265 if (_balanced_monitors) return true;
266
267 // Analyze the method to see if monitors are used properly.
268 VM_ENTRY_MARK;
269 methodHandle method(THREAD, get_methodOop());
270 assert(method->has_monitor_bytecodes(), "should have checked this");
271
272 // Check to see if a previous compilation computed the
273 // monitor-matching analysis.
274 if (method->guaranteed_monitor_matching()) {
275 _balanced_monitors = true;
276 return true;
277 }
278
279 {
280 EXCEPTION_MARK;
281 ResourceMark rm(THREAD);
282 GeneratePairingInfo gpi(method);
283 gpi.compute_map(CATCH);
284 if (!gpi.monitor_safe()) {
285 return false;
286 }
287 method->set_guaranteed_monitor_matching();
288 _balanced_monitors = true;
289 }
290 return true;
291 }
292
293
294 // ------------------------------------------------------------------
295 // ciMethod::get_flow_analysis
296 ciTypeFlow* ciMethod::get_flow_analysis() {
297 #ifdef COMPILER2
298 if (_flow == NULL) {
299 ciEnv* env = CURRENT_ENV;
300 _flow = new (env->arena()) ciTypeFlow(env, this);
301 _flow->do_flow();
302 }
303 return _flow;
304 #else // COMPILER2
305 ShouldNotReachHere();
306 return NULL;
307 #endif // COMPILER2
308 }
309
310
311 // ------------------------------------------------------------------
312 // ciMethod::get_osr_flow_analysis
313 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
314 #ifdef COMPILER2
315 // OSR entry points are always place after a call bytecode of some sort
316 assert(osr_bci >= 0, "must supply valid OSR entry point");
317 ciEnv* env = CURRENT_ENV;
318 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
319 flow->do_flow();
320 return flow;
321 #else // COMPILER2
322 ShouldNotReachHere();
323 return NULL;
324 #endif // COMPILER2
325 }
326
327 // ------------------------------------------------------------------
328 // ciMethod::raw_liveness_at_bci
329 //
330 // Which local variables are live at a specific bci?
331 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
332 check_is_loaded();
333 if (_liveness == NULL) {
334 // Create the liveness analyzer.
335 Arena* arena = CURRENT_ENV->arena();
336 _liveness = new (arena) MethodLiveness(arena, this);
337 _liveness->compute_liveness();
338 }
339 return _liveness->get_liveness_at(bci);
340 }
341
342 // ------------------------------------------------------------------
343 // ciMethod::liveness_at_bci
344 //
345 // Which local variables are live at a specific bci? When debugging
346 // will return true for all locals in some cases to improve debug
347 // information.
348 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
349 MethodLivenessResult result = raw_liveness_at_bci(bci);
350 if (CURRENT_ENV->jvmti_can_access_local_variables() || DeoptimizeALot || CompileTheWorld) {
351 // Keep all locals live for the user's edification and amusement.
352 result.at_put_range(0, result.size(), true);
353 }
354 return result;
355 }
356
357 // ciMethod::live_local_oops_at_bci
358 //
359 // find all the live oops in the locals array for a particular bci
360 // Compute what the interpreter believes by using the interpreter
361 // oopmap generator. This is used as a double check during osr to
362 // guard against conservative result from MethodLiveness making us
363 // think a dead oop is live. MethodLiveness is conservative in the
364 // sense that it may consider locals to be live which cannot be live,
365 // like in the case where a local could contain an oop or a primitive
366 // along different paths. In that case the local must be dead when
367 // those paths merge. Since the interpreter's viewpoint is used when
368 // gc'ing an interpreter frame we need to use its viewpoint during
369 // OSR when loading the locals.
370
371 BitMap ciMethod::live_local_oops_at_bci(int bci) {
372 VM_ENTRY_MARK;
373 InterpreterOopMap mask;
374 OopMapCache::compute_one_oop_map(get_methodOop(), bci, &mask);
375 int mask_size = max_locals();
376 BitMap result(mask_size);
377 result.clear();
378 int i;
379 for (i = 0; i < mask_size ; i++ ) {
380 if (mask.is_oop(i)) result.set_bit(i);
381 }
382 return result;
383 }
384
385
386 #ifdef COMPILER1
387 // ------------------------------------------------------------------
388 // ciMethod::bci_block_start
389 //
390 // Marks all bcis where a new basic block starts
391 const BitMap ciMethod::bci_block_start() {
392 check_is_loaded();
393 if (_liveness == NULL) {
394 // Create the liveness analyzer.
395 Arena* arena = CURRENT_ENV->arena();
396 _liveness = new (arena) MethodLiveness(arena, this);
397 _liveness->compute_liveness();
398 }
399
400 return _liveness->get_bci_block_start();
401 }
402 #endif // COMPILER1
403
404
405 // ------------------------------------------------------------------
406 // ciMethod::call_profile_at_bci
407 //
408 // Get the ciCallProfile for the invocation of this method.
409 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
410 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
411 ResourceMark rm;
412 ciCallProfile result;
413 if (method_data() != NULL && method_data()->is_mature()) {
414 ciProfileData* data = method_data()->bci_to_data(bci);
415 if (data != NULL && data->is_CounterData()) {
416 // Every profiled call site has a counter.
417 int count = data->as_CounterData()->count();
418
419 if (!data->is_ReceiverTypeData()) {
420 result._receiver_count[0] = 0; // that's a definite zero
421 } else { // ReceiverTypeData is a subclass of CounterData
422 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
423 // In addition, virtual call sites have receiver type information
424 int receivers_count_total = 0;
425 int morphism = 0;
426 for (uint i = 0; i < call->row_limit(); i++) {
427 ciKlass* receiver = call->receiver(i);
428 if (receiver == NULL) continue;
429 morphism += 1;
430 int rcount = call->receiver_count(i);
431 if (rcount == 0) rcount = 1; // Should be valid value
432 receivers_count_total += rcount;
433 // Add the receiver to result data.
434 result.add_receiver(receiver, rcount);
435 // If we extend profiling to record methods,
436 // we will set result._method also.
437 }
438 // Determine call site's morphism.
439 // The call site count could be == (receivers_count_total + 1)
440 // not only in the case of a polymorphic call but also in the case
441 // when a method data snapshot is taken after the site count was updated
442 // but before receivers counters were updated.
443 if (morphism == result._limit) {
444 // There were no array klasses and morphism <= MorphismLimit.
445 if (morphism < ciCallProfile::MorphismLimit ||
446 morphism == ciCallProfile::MorphismLimit &&
447 (receivers_count_total+1) >= count) {
448 result._morphism = morphism;
449 }
450 }
451 // Make the count consistent if this is a call profile. If count is
452 // zero or less, presume that this is a typecheck profile and
453 // do nothing. Otherwise, increase count to be the sum of all
454 // receiver's counts.
455 if (count > 0) {
456 if (count < receivers_count_total) {
457 count = receivers_count_total;
458 }
459 }
460 }
461 result._count = count;
462 }
463 }
464 return result;
465 }
466
467 // ------------------------------------------------------------------
468 // Add new receiver and sort data by receiver's profile count.
469 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
470 // Add new receiver and sort data by receiver's counts when we have space
471 // for it otherwise replace the less called receiver (less called receiver
472 // is placed to the last array element which is not used).
473 // First array's element contains most called receiver.
474 int i = _limit;
475 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
476 _receiver[i] = _receiver[i-1];
477 _receiver_count[i] = _receiver_count[i-1];
478 }
479 _receiver[i] = receiver;
480 _receiver_count[i] = receiver_count;
481 if (_limit < MorphismLimit) _limit++;
482 }
483
484 // ------------------------------------------------------------------
485 // ciMethod::find_monomorphic_target
486 //
487 // Given a certain calling environment, find the monomorphic target
488 // for the call. Return NULL if the call is not monomorphic in
489 // its calling environment, or if there are only abstract methods.
490 // The returned method is never abstract.
491 // Note: If caller uses a non-null result, it must inform dependencies
492 // via assert_unique_concrete_method or assert_leaf_type.
493 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
494 ciInstanceKlass* callee_holder,
495 ciInstanceKlass* actual_recv) {
496 check_is_loaded();
497
498 if (actual_recv->is_interface()) {
499 // %%% We cannot trust interface types, yet. See bug 6312651.
500 return NULL;
501 }
502
503 ciMethod* root_m = resolve_invoke(caller, actual_recv);
504 if (root_m == NULL) {
505 // Something went wrong looking up the actual receiver method.
506 return NULL;
507 }
508 assert(!root_m->is_abstract(), "resolve_invoke promise");
509
510 // Make certain quick checks even if UseCHA is false.
511
512 // Is it private or final?
513 if (root_m->can_be_statically_bound()) {
514 return root_m;
515 }
516
517 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
518 // Easy case. There is no other place to put a method, so don't bother
519 // to go through the VM_ENTRY_MARK and all the rest.
520 return root_m;
521 }
522
523 // Array methods (clone, hashCode, etc.) are always statically bound.
524 // If we were to see an array type here, we'd return root_m.
525 // However, this method processes only ciInstanceKlasses. (See 4962591.)
526 // The inline_native_clone intrinsic narrows Object to T[] properly,
527 // so there is no need to do the same job here.
528
529 if (!UseCHA) return NULL;
530
531 VM_ENTRY_MARK;
532
533 methodHandle target;
534 {
535 MutexLocker locker(Compile_lock);
536 klassOop context = actual_recv->get_klassOop();
537 target = Dependencies::find_unique_concrete_method(context,
538 root_m->get_methodOop());
539 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
540 }
541
542 #ifndef PRODUCT
543 if (TraceDependencies && target() != NULL && target() != root_m->get_methodOop()) {
544 tty->print("found a non-root unique target method");
545 tty->print_cr(" context = %s", instanceKlass::cast(actual_recv->get_klassOop())->external_name());
546 tty->print(" method = ");
547 target->print_short_name(tty);
548 tty->cr();
549 }
550 #endif //PRODUCT
551
552 if (target() == NULL) {
553 return NULL;
554 }
555 if (target() == root_m->get_methodOop()) {
556 return root_m;
557 }
558 if (!root_m->is_public() &&
559 !root_m->is_protected()) {
560 // If we are going to reason about inheritance, it's easiest
561 // if the method in question is public, protected, or private.
562 // If the answer is not root_m, it is conservatively correct
563 // to return NULL, even if the CHA encountered irrelevant
564 // methods in other packages.
565 // %%% TO DO: Work out logic for package-private methods
566 // with the same name but different vtable indexes.
567 return NULL;
568 }
569 return CURRENT_THREAD_ENV->get_object(target())->as_method();
570 }
571
572 // ------------------------------------------------------------------
573 // ciMethod::resolve_invoke
574 //
575 // Given a known receiver klass, find the target for the call.
576 // Return NULL if the call has no target or the target is abstract.
577 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver) {
578 check_is_loaded();
579 VM_ENTRY_MARK;
580
581 KlassHandle caller_klass (THREAD, caller->get_klassOop());
582 KlassHandle h_recv (THREAD, exact_receiver->get_klassOop());
583 KlassHandle h_resolved (THREAD, holder()->get_klassOop());
584 symbolHandle h_name (THREAD, name()->get_symbolOop());
585 symbolHandle h_signature (THREAD, signature()->get_symbolOop());
586
587 methodHandle m;
588 // Only do exact lookup if receiver klass has been linked. Otherwise,
589 // the vtable has not been setup, and the LinkResolver will fail.
590 if (h_recv->oop_is_javaArray()
591 ||
592 instanceKlass::cast(h_recv())->is_linked() && !exact_receiver->is_interface()) {
593 if (holder()->is_interface()) {
594 m = LinkResolver::resolve_interface_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass);
595 } else {
596 m = LinkResolver::resolve_virtual_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass);
597 }
598 }
599
600 if (m.is_null()) {
601 // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
602 return NULL;
603 }
604
605 ciMethod* result = this;
606 if (m() != get_methodOop()) {
607 result = CURRENT_THREAD_ENV->get_object(m())->as_method();
608 }
609
610 // Don't return abstract methods because they aren't
611 // optimizable or interesting.
612 if (result->is_abstract()) {
613 return NULL;
614 } else {
615 return result;
616 }
617 }
618
619 // ------------------------------------------------------------------
620 // ciMethod::resolve_vtable_index
621 //
622 // Given a known receiver klass, find the vtable index for the call.
623 // Return methodOopDesc::invalid_vtable_index if the vtable_index is unknown.
624 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
625 check_is_loaded();
626
627 int vtable_index = methodOopDesc::invalid_vtable_index;
628 // Only do lookup if receiver klass has been linked. Otherwise,
629 // the vtable has not been setup, and the LinkResolver will fail.
630 if (!receiver->is_interface()
631 && (!receiver->is_instance_klass() ||
632 receiver->as_instance_klass()->is_linked())) {
633 VM_ENTRY_MARK;
634
635 KlassHandle caller_klass (THREAD, caller->get_klassOop());
636 KlassHandle h_recv (THREAD, receiver->get_klassOop());
637 symbolHandle h_name (THREAD, name()->get_symbolOop());
638 symbolHandle h_signature (THREAD, signature()->get_symbolOop());
639
640 vtable_index = LinkResolver::resolve_virtual_vtable_index(h_recv, h_recv, h_name, h_signature, caller_klass);
641 if (vtable_index == methodOopDesc::nonvirtual_vtable_index) {
642 // A statically bound method. Return "no such index".
643 vtable_index = methodOopDesc::invalid_vtable_index;
644 }
645 }
646
647 return vtable_index;
648 }
649
650 // ------------------------------------------------------------------
651 // ciMethod::interpreter_call_site_count
652 int ciMethod::interpreter_call_site_count(int bci) {
653 if (method_data() != NULL) {
654 ResourceMark rm;
655 ciProfileData* data = method_data()->bci_to_data(bci);
656 if (data != NULL && data->is_CounterData()) {
657 return scale_count(data->as_CounterData()->count());
658 }
659 }
660 return -1; // unknown
661 }
662
663 // ------------------------------------------------------------------
664 // Adjust a CounterData count to be commensurate with
665 // interpreter_invocation_count. If the MDO exists for
666 // only 25% of the time the method exists, then the
667 // counts in the MDO should be scaled by 4X, so that
668 // they can be usefully and stably compared against the
669 // invocation counts in methods.
670 int ciMethod::scale_count(int count, float prof_factor) {
671 if (count > 0 && method_data() != NULL) {
672 int current_mileage = method_data()->current_mileage();
673 int creation_mileage = method_data()->creation_mileage();
674 int counter_life = current_mileage - creation_mileage;
675 int method_life = interpreter_invocation_count();
676 // counter_life due to backedge_counter could be > method_life
677 if (counter_life > method_life)
678 counter_life = method_life;
679 if (0 < counter_life && counter_life <= method_life) {
680 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
681 count = (count > 0) ? count : 1;
682 }
683 }
684 return count;
685 }
686
687 // ------------------------------------------------------------------
688 // invokedynamic support
689 //
690 bool ciMethod::is_method_handle_invoke() {
691 check_is_loaded();
692 bool flag = ((flags().as_int() & JVM_MH_INVOKE_BITS) == JVM_MH_INVOKE_BITS);
693 #ifdef ASSERT
694 {
695 VM_ENTRY_MARK;
696 bool flag2 = get_methodOop()->is_method_handle_invoke();
697 assert(flag == flag2, "consistent");
698 }
699 #endif //ASSERT
700 return flag;
701 }
702
703 ciInstance* ciMethod::method_handle_type() {
704 check_is_loaded();
705 VM_ENTRY_MARK;
706 oop mtype = get_methodOop()->method_handle_type();
707 return CURRENT_THREAD_ENV->get_object(mtype)->as_instance();
708 }
709
710
711 // ------------------------------------------------------------------
712 // ciMethod::build_method_data
713 //
714 // Generate new methodDataOop objects at compile time.
715 void ciMethod::build_method_data(methodHandle h_m) {
716 EXCEPTION_CONTEXT;
717 if (is_native() || is_abstract() || h_m()->is_accessor()) return;
718 if (h_m()->method_data() == NULL) {
719 methodOopDesc::build_interpreter_method_data(h_m, THREAD);
720 if (HAS_PENDING_EXCEPTION) {
721 CLEAR_PENDING_EXCEPTION;
722 }
723 }
724 if (h_m()->method_data() != NULL) {
725 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data();
726 _method_data->load_data();
727 } else {
728 _method_data = CURRENT_ENV->get_empty_methodData();
729 }
730 }
731
732 // public, retroactive version
733 void ciMethod::build_method_data() {
734 if (_method_data == NULL || _method_data->is_empty()) {
735 GUARDED_VM_ENTRY({
736 build_method_data(get_methodOop());
737 });
738 }
739 }
740
741
742 // ------------------------------------------------------------------
743 // ciMethod::method_data
744 //
745 ciMethodData* ciMethod::method_data() {
746 if (_method_data != NULL) {
747 return _method_data;
748 }
749 VM_ENTRY_MARK;
750 ciEnv* env = CURRENT_ENV;
751 Thread* my_thread = JavaThread::current();
752 methodHandle h_m(my_thread, get_methodOop());
753
754 if (Tier1UpdateMethodData && is_tier1_compile(env->comp_level())) {
755 build_method_data(h_m);
756 }
757
758 if (h_m()->method_data() != NULL) {
759 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data();
760 _method_data->load_data();
761 } else {
762 _method_data = CURRENT_ENV->get_empty_methodData();
763 }
764 return _method_data;
765
766 }
767
768
769 // ------------------------------------------------------------------
770 // ciMethod::will_link
771 //
772 // Will this method link in a specific calling context?
773 bool ciMethod::will_link(ciKlass* accessing_klass,
774 ciKlass* declared_method_holder,
775 Bytecodes::Code bc) {
776 if (!is_loaded()) {
777 // Method lookup failed.
778 return false;
779 }
780
781 // The link checks have been front-loaded into the get_method
782 // call. This method (ciMethod::will_link()) will be removed
783 // in the future.
784
785 return true;
786 }
787
788 // ------------------------------------------------------------------
789 // ciMethod::should_exclude
790 //
791 // Should this method be excluded from compilation?
792 bool ciMethod::should_exclude() {
793 check_is_loaded();
794 VM_ENTRY_MARK;
795 methodHandle mh(THREAD, get_methodOop());
796 bool ignore;
797 return CompilerOracle::should_exclude(mh, ignore);
798 }
799
800 // ------------------------------------------------------------------
801 // ciMethod::should_inline
802 //
803 // Should this method be inlined during compilation?
804 bool ciMethod::should_inline() {
805 check_is_loaded();
806 VM_ENTRY_MARK;
807 methodHandle mh(THREAD, get_methodOop());
808 return CompilerOracle::should_inline(mh);
809 }
810
811 // ------------------------------------------------------------------
812 // ciMethod::should_not_inline
813 //
814 // Should this method be disallowed from inlining during compilation?
815 bool ciMethod::should_not_inline() {
816 check_is_loaded();
817 VM_ENTRY_MARK;
818 methodHandle mh(THREAD, get_methodOop());
819 return CompilerOracle::should_not_inline(mh);
820 }
821
822 // ------------------------------------------------------------------
823 // ciMethod::should_print_assembly
824 //
825 // Should the compiler print the generated code for this method?
826 bool ciMethod::should_print_assembly() {
827 check_is_loaded();
828 VM_ENTRY_MARK;
829 methodHandle mh(THREAD, get_methodOop());
830 return CompilerOracle::should_print(mh);
831 }
832
833 // ------------------------------------------------------------------
834 // ciMethod::break_at_execute
835 //
836 // Should the compiler insert a breakpoint into the generated code
837 // method?
838 bool ciMethod::break_at_execute() {
839 check_is_loaded();
840 VM_ENTRY_MARK;
841 methodHandle mh(THREAD, get_methodOop());
842 return CompilerOracle::should_break_at(mh);
843 }
844
845 // ------------------------------------------------------------------
846 // ciMethod::has_option
847 //
848 bool ciMethod::has_option(const char* option) {
849 check_is_loaded();
850 VM_ENTRY_MARK;
851 methodHandle mh(THREAD, get_methodOop());
852 return CompilerOracle::has_option_string(mh, option);
853 }
854
855 // ------------------------------------------------------------------
856 // ciMethod::can_be_compiled
857 //
858 // Have previous compilations of this method succeeded?
859 bool ciMethod::can_be_compiled() {
860 check_is_loaded();
861 return _is_compilable;
862 }
863
864 // ------------------------------------------------------------------
865 // ciMethod::set_not_compilable
866 //
867 // Tell the VM that this method cannot be compiled at all.
868 void ciMethod::set_not_compilable() {
869 check_is_loaded();
870 VM_ENTRY_MARK;
871 _is_compilable = false;
872 get_methodOop()->set_not_compilable();
873 }
874
875 // ------------------------------------------------------------------
876 // ciMethod::can_be_osr_compiled
877 //
878 // Have previous compilations of this method succeeded?
879 //
880 // Implementation note: the VM does not currently keep track
881 // of failed OSR compilations per bci. The entry_bci parameter
882 // is currently unused.
883 bool ciMethod::can_be_osr_compiled(int entry_bci) {
884 check_is_loaded();
885 VM_ENTRY_MARK;
886 return !get_methodOop()->access_flags().is_not_osr_compilable();
887 }
888
889 // ------------------------------------------------------------------
890 // ciMethod::has_compiled_code
891 bool ciMethod::has_compiled_code() {
892 VM_ENTRY_MARK;
893 return get_methodOop()->code() != NULL;
894 }
895
896 // ------------------------------------------------------------------
897 // ciMethod::instructions_size
898 // This is a rough metric for "fat" methods, compared
899 // before inlining with InlineSmallCode.
900 // The CodeBlob::instructions_size accessor includes
901 // junk like exception handler, stubs, and constant table,
902 // which are not highly relevant to an inlined method.
903 // So we use the more specific accessor nmethod::code_size.
904 int ciMethod::instructions_size() {
905 GUARDED_VM_ENTRY(
906 nmethod* code = get_methodOop()->code();
907 // if there's no compiled code or the code was produced by the
908 // tier1 profiler return 0 for the code size. This should
909 // probably be based on the compilation level of the nmethod but
910 // that currently isn't properly recorded.
911 if (code == NULL ||
912 (TieredCompilation && code->compiler() != NULL && code->compiler()->is_c1())) {
913 return 0;
914 }
915 return code->code_end() - code->verified_entry_point();
916 )
917 }
918
919 // ------------------------------------------------------------------
920 // ciMethod::log_nmethod_identity
921 void ciMethod::log_nmethod_identity(xmlStream* log) {
922 GUARDED_VM_ENTRY(
923 nmethod* code = get_methodOop()->code();
924 if (code != NULL) {
925 code->log_identity(log);
926 }
927 )
928 }
929
930 // ------------------------------------------------------------------
931 // ciMethod::is_not_reached
932 bool ciMethod::is_not_reached(int bci) {
933 check_is_loaded();
934 VM_ENTRY_MARK;
935 return Interpreter::is_not_reached(
936 methodHandle(THREAD, get_methodOop()), bci);
937 }
938
939 // ------------------------------------------------------------------
940 // ciMethod::was_never_executed
941 bool ciMethod::was_executed_more_than(int times) {
942 VM_ENTRY_MARK;
943 return get_methodOop()->was_executed_more_than(times);
944 }
945
946 // ------------------------------------------------------------------
947 // ciMethod::has_unloaded_classes_in_signature
948 bool ciMethod::has_unloaded_classes_in_signature() {
949 VM_ENTRY_MARK;
950 {
951 EXCEPTION_MARK;
952 methodHandle m(THREAD, get_methodOop());
953 bool has_unloaded = methodOopDesc::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);
954 if( HAS_PENDING_EXCEPTION ) {
955 CLEAR_PENDING_EXCEPTION;
956 return true; // Declare that we may have unloaded classes
957 }
958 return has_unloaded;
959 }
960 }
961
962 // ------------------------------------------------------------------
963 // ciMethod::is_klass_loaded
964 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
965 VM_ENTRY_MARK;
966 return get_methodOop()->is_klass_loaded(refinfo_index, must_be_resolved);
967 }
968
969 // ------------------------------------------------------------------
970 // ciMethod::check_call
971 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
972 VM_ENTRY_MARK;
973 {
974 EXCEPTION_MARK;
975 HandleMark hm(THREAD);
976 constantPoolHandle pool (THREAD, get_methodOop()->constants());
977 methodHandle spec_method;
978 KlassHandle spec_klass;
979 LinkResolver::resolve_method(spec_method, spec_klass, pool, refinfo_index, THREAD);
980 if (HAS_PENDING_EXCEPTION) {
981 CLEAR_PENDING_EXCEPTION;
982 return false;
983 } else {
984 return (spec_method->is_static() == is_static);
985 }
986 }
987 return false;
988 }
989
990 // ------------------------------------------------------------------
991 // ciMethod::print_codes
992 //
993 // Print the bytecodes for this method.
994 void ciMethod::print_codes_on(outputStream* st) {
995 check_is_loaded();
996 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(st);)
997 }
998
999
1000 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1001 check_is_loaded(); \
1002 VM_ENTRY_MARK; \
1003 return get_methodOop()->flag_accessor(); \
1004 }
1005
1006 bool ciMethod::is_empty_method() const { FETCH_FLAG_FROM_VM(is_empty_method); }
1007 bool ciMethod::is_vanilla_constructor() const { FETCH_FLAG_FROM_VM(is_vanilla_constructor); }
1008 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1009 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1010 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1011 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); }
1012
1013 BCEscapeAnalyzer *ciMethod::get_bcea() {
1014 if (_bcea == NULL) {
1015 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1016 }
1017 return _bcea;
1018 }
1019
1020 ciMethodBlocks *ciMethod::get_method_blocks() {
1021 Arena *arena = CURRENT_ENV->arena();
1022 if (_method_blocks == NULL) {
1023 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1024 }
1025 return _method_blocks;
1026 }
1027
1028 #undef FETCH_FLAG_FROM_VM
1029
1030
1031 // ------------------------------------------------------------------
1032 // ciMethod::print_codes
1033 //
1034 // Print a range of the bytecodes for this method.
1035 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1036 check_is_loaded();
1037 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(from, to, st);)
1038 }
1039
1040 // ------------------------------------------------------------------
1041 // ciMethod::print_name
1042 //
1043 // Print the name of this method, including signature and some flags.
1044 void ciMethod::print_name(outputStream* st) {
1045 check_is_loaded();
1046 GUARDED_VM_ENTRY(get_methodOop()->print_name(st);)
1047 }
1048
1049 // ------------------------------------------------------------------
1050 // ciMethod::print_short_name
1051 //
1052 // Print the name of this method, without signature.
1053 void ciMethod::print_short_name(outputStream* st) {
1054 check_is_loaded();
1055 GUARDED_VM_ENTRY(get_methodOop()->print_short_name(st);)
1056 }
1057
1058 // ------------------------------------------------------------------
1059 // ciMethod::print_impl
1060 //
1061 // Implementation of the print method.
1062 void ciMethod::print_impl(outputStream* st) {
1063 ciObject::print_impl(st);
1064 st->print(" name=");
1065 name()->print_symbol_on(st);
1066 st->print(" holder=");
1067 holder()->print_name_on(st);
1068 st->print(" signature=");
1069 signature()->as_symbol()->print_symbol_on(st);
1070 if (is_loaded()) {
1071 st->print(" loaded=true flags=");
1072 flags().print_member_flags(st);
1073 } else {
1074 st->print(" loaded=false");
1075 }
1076 }