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::liveness_at_bci
329 //
330 // Which local variables are live at a specific bci?
331 MethodLivenessResult ciMethod::liveness_at_bci(int bci, bool raw) {
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 MethodLivenessResult result = _liveness->get_liveness_at(bci);
340 if (!raw &&
341 (CURRENT_ENV->jvmti_can_access_local_variables() || DeoptimizeALot || CompileTheWorld)) {
342 // Keep all locals live for the user's edification and amusement.
343 result.at_put_range(0, result.size(), true);
344 }
345 return result;
346 }
347
348 // ciMethod::live_local_oops_at_bci
349 //
350 // find all the live oops in the locals array for a particular bci
351 // Compute what the interpreter believes by using the interpreter
352 // oopmap generator. This is used as a double check during osr to
353 // guard against conservative result from MethodLiveness making us
354 // think a dead oop is live. MethodLiveness is conservative in the
355 // sense that it may consider locals to be live which cannot be live,
356 // like in the case where a local could contain an oop or a primitive
357 // along different paths. In that case the local must be dead when
358 // those paths merge. Since the interpreter's viewpoint is used when
359 // gc'ing an interpreter frame we need to use its viewpoint during
360 // OSR when loading the locals.
361
362 BitMap ciMethod::live_local_oops_at_bci(int bci) {
363 VM_ENTRY_MARK;
364 InterpreterOopMap mask;
365 OopMapCache::compute_one_oop_map(get_methodOop(), bci, &mask);
366 int mask_size = max_locals();
367 BitMap result(mask_size);
368 result.clear();
369 int i;
370 for (i = 0; i < mask_size ; i++ ) {
371 if (mask.is_oop(i)) result.set_bit(i);
372 }
373 return result;
374 }
375
376
377 #ifdef COMPILER1
378 // ------------------------------------------------------------------
379 // ciMethod::bci_block_start
380 //
381 // Marks all bcis where a new basic block starts
382 const BitMap ciMethod::bci_block_start() {
383 check_is_loaded();
384 if (_liveness == NULL) {
385 // Create the liveness analyzer.
386 Arena* arena = CURRENT_ENV->arena();
387 _liveness = new (arena) MethodLiveness(arena, this);
388 _liveness->compute_liveness();
389 }
390
391 return _liveness->get_bci_block_start();
392 }
393 #endif // COMPILER1
394
395
396 // ------------------------------------------------------------------
397 // ciMethod::call_profile_at_bci
398 //
399 // Get the ciCallProfile for the invocation of this method.
400 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
401 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
402 ResourceMark rm;
403 ciCallProfile result;
404 if (method_data() != NULL && method_data()->is_mature()) {
405 ciProfileData* data = method_data()->bci_to_data(bci);
406 if (data != NULL && data->is_CounterData()) {
407 // Every profiled call site has a counter.
408 int count = data->as_CounterData()->count();
409
410 if (!data->is_ReceiverTypeData()) {
411 result._receiver_count[0] = 0; // that's a definite zero
412 } else { // ReceiverTypeData is a subclass of CounterData
413 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
414 // In addition, virtual call sites have receiver type information
415 int receivers_count_total = 0;
416 int morphism = 0;
417 for (uint i = 0; i < call->row_limit(); i++) {
418 ciKlass* receiver = call->receiver(i);
419 if (receiver == NULL) continue;
420 morphism += 1;
421 int rcount = call->receiver_count(i);
422 if (rcount == 0) rcount = 1; // Should be valid value
423 receivers_count_total += rcount;
424 // Add the receiver to result data.
425 result.add_receiver(receiver, rcount);
426 // If we extend profiling to record methods,
427 // we will set result._method also.
428 }
429 // Determine call site's morphism.
430 // The call site count could be == (receivers_count_total + 1)
431 // not only in the case of a polymorphic call but also in the case
432 // when a method data snapshot is taken after the site count was updated
433 // but before receivers counters were updated.
434 if (morphism == result._limit) {
435 // There were no array klasses and morphism <= MorphismLimit.
436 if (morphism < ciCallProfile::MorphismLimit ||
437 morphism == ciCallProfile::MorphismLimit &&
438 (receivers_count_total+1) >= count) {
439 result._morphism = morphism;
440 }
441 }
442 // Make the count consistent if this is a call profile. If count is
443 // zero or less, presume that this is a typecheck profile and
444 // do nothing. Otherwise, increase count to be the sum of all
445 // receiver's counts.
446 if (count > 0) {
447 if (count < receivers_count_total) {
448 count = receivers_count_total;
449 }
450 }
451 }
452 result._count = count;
453 }
454 }
455 return result;
456 }
457
458 // ------------------------------------------------------------------
459 // Add new receiver and sort data by receiver's profile count.
460 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
461 // Add new receiver and sort data by receiver's counts when we have space
462 // for it otherwise replace the less called receiver (less called receiver
463 // is placed to the last array element which is not used).
464 // First array's element contains most called receiver.
465 int i = _limit;
466 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
467 _receiver[i] = _receiver[i-1];
468 _receiver_count[i] = _receiver_count[i-1];
469 }
470 _receiver[i] = receiver;
471 _receiver_count[i] = receiver_count;
472 if (_limit < MorphismLimit) _limit++;
473 }
474
475 // ------------------------------------------------------------------
476 // ciMethod::find_monomorphic_target
477 //
478 // Given a certain calling environment, find the monomorphic target
479 // for the call. Return NULL if the call is not monomorphic in
480 // its calling environment, or if there are only abstract methods.
481 // The returned method is never abstract.
482 // Note: If caller uses a non-null result, it must inform dependencies
483 // via assert_unique_concrete_method or assert_leaf_type.
484 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
485 ciInstanceKlass* callee_holder,
486 ciInstanceKlass* actual_recv) {
487 check_is_loaded();
488
489 if (actual_recv->is_interface()) {
490 // %%% We cannot trust interface types, yet. See bug 6312651.
491 return NULL;
492 }
493
494 ciMethod* root_m = resolve_invoke(caller, actual_recv);
495 if (root_m == NULL) {
496 // Something went wrong looking up the actual receiver method.
497 return NULL;
498 }
499 assert(!root_m->is_abstract(), "resolve_invoke promise");
500
501 // Make certain quick checks even if UseCHA is false.
502
503 // Is it private or final?
504 if (root_m->can_be_statically_bound()) {
505 return root_m;
506 }
507
508 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
509 // Easy case. There is no other place to put a method, so don't bother
510 // to go through the VM_ENTRY_MARK and all the rest.
511 return root_m;
512 }
513
514 // Array methods (clone, hashCode, etc.) are always statically bound.
515 // If we were to see an array type here, we'd return root_m.
516 // However, this method processes only ciInstanceKlasses. (See 4962591.)
517 // The inline_native_clone intrinsic narrows Object to T[] properly,
518 // so there is no need to do the same job here.
519
520 if (!UseCHA) return NULL;
521
522 VM_ENTRY_MARK;
523
524 methodHandle target;
525 {
526 MutexLocker locker(Compile_lock);
527 klassOop context = actual_recv->get_klassOop();
528 target = Dependencies::find_unique_concrete_method(context,
529 root_m->get_methodOop());
530 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
531 }
532
533 #ifndef PRODUCT
534 if (TraceDependencies && target() != NULL && target() != root_m->get_methodOop()) {
535 tty->print("found a non-root unique target method");
536 tty->print_cr(" context = %s", instanceKlass::cast(actual_recv->get_klassOop())->external_name());
537 tty->print(" method = ");
538 target->print_short_name(tty);
539 tty->cr();
540 }
541 #endif //PRODUCT
542
543 if (target() == NULL) {
544 return NULL;
545 }
546 if (target() == root_m->get_methodOop()) {
547 return root_m;
548 }
549 if (!root_m->is_public() &&
550 !root_m->is_protected()) {
551 // If we are going to reason about inheritance, it's easiest
552 // if the method in question is public, protected, or private.
553 // If the answer is not root_m, it is conservatively correct
554 // to return NULL, even if the CHA encountered irrelevant
555 // methods in other packages.
556 // %%% TO DO: Work out logic for package-private methods
557 // with the same name but different vtable indexes.
558 return NULL;
559 }
560 return CURRENT_THREAD_ENV->get_object(target())->as_method();
561 }
562
563 // ------------------------------------------------------------------
564 // ciMethod::resolve_invoke
565 //
566 // Given a known receiver klass, find the target for the call.
567 // Return NULL if the call has no target or the target is abstract.
568 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver) {
569 check_is_loaded();
570 VM_ENTRY_MARK;
571
572 KlassHandle caller_klass (THREAD, caller->get_klassOop());
573 KlassHandle h_recv (THREAD, exact_receiver->get_klassOop());
574 KlassHandle h_resolved (THREAD, holder()->get_klassOop());
575 symbolHandle h_name (THREAD, name()->get_symbolOop());
576 symbolHandle h_signature (THREAD, signature()->get_symbolOop());
577
578 methodHandle m;
579 // Only do exact lookup if receiver klass has been linked. Otherwise,
580 // the vtable has not been setup, and the LinkResolver will fail.
581 if (h_recv->oop_is_javaArray()
582 ||
583 instanceKlass::cast(h_recv())->is_linked() && !exact_receiver->is_interface()) {
584 if (holder()->is_interface()) {
585 m = LinkResolver::resolve_interface_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass);
586 } else {
587 m = LinkResolver::resolve_virtual_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass);
588 }
589 }
590
591 if (m.is_null()) {
592 // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
593 return NULL;
594 }
595
596 ciMethod* result = this;
597 if (m() != get_methodOop()) {
598 result = CURRENT_THREAD_ENV->get_object(m())->as_method();
599 }
600
601 // Don't return abstract methods because they aren't
602 // optimizable or interesting.
603 if (result->is_abstract()) {
604 return NULL;
605 } else {
606 return result;
607 }
608 }
609
610 // ------------------------------------------------------------------
611 // ciMethod::resolve_vtable_index
612 //
613 // Given a known receiver klass, find the vtable index for the call.
614 // Return methodOopDesc::invalid_vtable_index if the vtable_index is unknown.
615 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
616 check_is_loaded();
617
618 int vtable_index = methodOopDesc::invalid_vtable_index;
619 // Only do lookup if receiver klass has been linked. Otherwise,
620 // the vtable has not been setup, and the LinkResolver will fail.
621 if (!receiver->is_interface()
622 && (!receiver->is_instance_klass() ||
623 receiver->as_instance_klass()->is_linked())) {
624 VM_ENTRY_MARK;
625
626 KlassHandle caller_klass (THREAD, caller->get_klassOop());
627 KlassHandle h_recv (THREAD, receiver->get_klassOop());
628 symbolHandle h_name (THREAD, name()->get_symbolOop());
629 symbolHandle h_signature (THREAD, signature()->get_symbolOop());
630
631 vtable_index = LinkResolver::resolve_virtual_vtable_index(h_recv, h_recv, h_name, h_signature, caller_klass);
632 if (vtable_index == methodOopDesc::nonvirtual_vtable_index) {
633 // A statically bound method. Return "no such index".
634 vtable_index = methodOopDesc::invalid_vtable_index;
635 }
636 }
637
638 return vtable_index;
639 }
640
641 // ------------------------------------------------------------------
642 // ciMethod::interpreter_call_site_count
643 int ciMethod::interpreter_call_site_count(int bci) {
644 if (method_data() != NULL) {
645 ResourceMark rm;
646 ciProfileData* data = method_data()->bci_to_data(bci);
647 if (data != NULL && data->is_CounterData()) {
648 return scale_count(data->as_CounterData()->count());
649 }
650 }
651 return -1; // unknown
652 }
653
654 // ------------------------------------------------------------------
655 // Adjust a CounterData count to be commensurate with
656 // interpreter_invocation_count. If the MDO exists for
657 // only 25% of the time the method exists, then the
658 // counts in the MDO should be scaled by 4X, so that
659 // they can be usefully and stably compared against the
660 // invocation counts in methods.
661 int ciMethod::scale_count(int count, float prof_factor) {
662 if (count > 0 && method_data() != NULL) {
663 int current_mileage = method_data()->current_mileage();
664 int creation_mileage = method_data()->creation_mileage();
665 int counter_life = current_mileage - creation_mileage;
666 int method_life = interpreter_invocation_count();
667 // counter_life due to backedge_counter could be > method_life
668 if (counter_life > method_life)
669 counter_life = method_life;
670 if (0 < counter_life && counter_life <= method_life) {
671 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
672 count = (count > 0) ? count : 1;
673 }
674 }
675 return count;
676 }
677
678 // ------------------------------------------------------------------
679 // invokedynamic support
680 //
681 bool ciMethod::is_method_handle_invoke() {
682 check_is_loaded();
683 bool flag = ((flags().as_int() & JVM_MH_INVOKE_BITS) == JVM_MH_INVOKE_BITS);
684 #ifdef ASSERT
685 {
686 VM_ENTRY_MARK;
687 bool flag2 = get_methodOop()->is_method_handle_invoke();
688 assert(flag == flag2, "consistent");
689 }
690 #endif //ASSERT
691 return flag;
692 }
693
694 ciInstance* ciMethod::method_handle_type() {
695 check_is_loaded();
696 VM_ENTRY_MARK;
697 oop mtype = get_methodOop()->method_handle_type();
698 return CURRENT_THREAD_ENV->get_object(mtype)->as_instance();
699 }
700
701
702 // ------------------------------------------------------------------
703 // ciMethod::build_method_data
704 //
705 // Generate new methodDataOop objects at compile time.
706 void ciMethod::build_method_data(methodHandle h_m) {
707 EXCEPTION_CONTEXT;
708 if (is_native() || is_abstract() || h_m()->is_accessor()) return;
709 if (h_m()->method_data() == NULL) {
710 methodOopDesc::build_interpreter_method_data(h_m, THREAD);
711 if (HAS_PENDING_EXCEPTION) {
712 CLEAR_PENDING_EXCEPTION;
713 }
714 }
715 if (h_m()->method_data() != NULL) {
716 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data();
717 _method_data->load_data();
718 } else {
719 _method_data = CURRENT_ENV->get_empty_methodData();
720 }
721 }
722
723 // public, retroactive version
724 void ciMethod::build_method_data() {
725 if (_method_data == NULL || _method_data->is_empty()) {
726 GUARDED_VM_ENTRY({
727 build_method_data(get_methodOop());
728 });
729 }
730 }
731
732
733 // ------------------------------------------------------------------
734 // ciMethod::method_data
735 //
736 ciMethodData* ciMethod::method_data() {
737 if (_method_data != NULL) {
738 return _method_data;
739 }
740 VM_ENTRY_MARK;
741 ciEnv* env = CURRENT_ENV;
742 Thread* my_thread = JavaThread::current();
743 methodHandle h_m(my_thread, get_methodOop());
744
745 if (Tier1UpdateMethodData && is_tier1_compile(env->comp_level())) {
746 build_method_data(h_m);
747 }
748
749 if (h_m()->method_data() != NULL) {
750 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data();
751 _method_data->load_data();
752 } else {
753 _method_data = CURRENT_ENV->get_empty_methodData();
754 }
755 return _method_data;
756
757 }
758
759
760 // ------------------------------------------------------------------
761 // ciMethod::will_link
762 //
763 // Will this method link in a specific calling context?
764 bool ciMethod::will_link(ciKlass* accessing_klass,
765 ciKlass* declared_method_holder,
766 Bytecodes::Code bc) {
767 if (!is_loaded()) {
768 // Method lookup failed.
769 return false;
770 }
771
772 // The link checks have been front-loaded into the get_method
773 // call. This method (ciMethod::will_link()) will be removed
774 // in the future.
775
776 return true;
777 }
778
779 // ------------------------------------------------------------------
780 // ciMethod::should_exclude
781 //
782 // Should this method be excluded from compilation?
783 bool ciMethod::should_exclude() {
784 check_is_loaded();
785 VM_ENTRY_MARK;
786 methodHandle mh(THREAD, get_methodOop());
787 bool ignore;
788 return CompilerOracle::should_exclude(mh, ignore);
789 }
790
791 // ------------------------------------------------------------------
792 // ciMethod::should_inline
793 //
794 // Should this method be inlined during compilation?
795 bool ciMethod::should_inline() {
796 check_is_loaded();
797 VM_ENTRY_MARK;
798 methodHandle mh(THREAD, get_methodOop());
799 return CompilerOracle::should_inline(mh);
800 }
801
802 // ------------------------------------------------------------------
803 // ciMethod::should_not_inline
804 //
805 // Should this method be disallowed from inlining during compilation?
806 bool ciMethod::should_not_inline() {
807 check_is_loaded();
808 VM_ENTRY_MARK;
809 methodHandle mh(THREAD, get_methodOop());
810 return CompilerOracle::should_not_inline(mh);
811 }
812
813 // ------------------------------------------------------------------
814 // ciMethod::should_print_assembly
815 //
816 // Should the compiler print the generated code for this method?
817 bool ciMethod::should_print_assembly() {
818 check_is_loaded();
819 VM_ENTRY_MARK;
820 methodHandle mh(THREAD, get_methodOop());
821 return CompilerOracle::should_print(mh);
822 }
823
824 // ------------------------------------------------------------------
825 // ciMethod::break_at_execute
826 //
827 // Should the compiler insert a breakpoint into the generated code
828 // method?
829 bool ciMethod::break_at_execute() {
830 check_is_loaded();
831 VM_ENTRY_MARK;
832 methodHandle mh(THREAD, get_methodOop());
833 return CompilerOracle::should_break_at(mh);
834 }
835
836 // ------------------------------------------------------------------
837 // ciMethod::has_option
838 //
839 bool ciMethod::has_option(const char* option) {
840 check_is_loaded();
841 VM_ENTRY_MARK;
842 methodHandle mh(THREAD, get_methodOop());
843 return CompilerOracle::has_option_string(mh, option);
844 }
845
846 // ------------------------------------------------------------------
847 // ciMethod::can_be_compiled
848 //
849 // Have previous compilations of this method succeeded?
850 bool ciMethod::can_be_compiled() {
851 check_is_loaded();
852 return _is_compilable;
853 }
854
855 // ------------------------------------------------------------------
856 // ciMethod::set_not_compilable
857 //
858 // Tell the VM that this method cannot be compiled at all.
859 void ciMethod::set_not_compilable() {
860 check_is_loaded();
861 VM_ENTRY_MARK;
862 _is_compilable = false;
863 get_methodOop()->set_not_compilable();
864 }
865
866 // ------------------------------------------------------------------
867 // ciMethod::can_be_osr_compiled
868 //
869 // Have previous compilations of this method succeeded?
870 //
871 // Implementation note: the VM does not currently keep track
872 // of failed OSR compilations per bci. The entry_bci parameter
873 // is currently unused.
874 bool ciMethod::can_be_osr_compiled(int entry_bci) {
875 check_is_loaded();
876 VM_ENTRY_MARK;
877 return !get_methodOop()->access_flags().is_not_osr_compilable();
878 }
879
880 // ------------------------------------------------------------------
881 // ciMethod::has_compiled_code
882 bool ciMethod::has_compiled_code() {
883 VM_ENTRY_MARK;
884 return get_methodOop()->code() != NULL;
885 }
886
887 // ------------------------------------------------------------------
888 // ciMethod::instructions_size
889 // This is a rough metric for "fat" methods, compared
890 // before inlining with InlineSmallCode.
891 // The CodeBlob::instructions_size accessor includes
892 // junk like exception handler, stubs, and constant table,
893 // which are not highly relevant to an inlined method.
894 // So we use the more specific accessor nmethod::code_size.
895 int ciMethod::instructions_size() {
896 GUARDED_VM_ENTRY(
897 nmethod* code = get_methodOop()->code();
898 // if there's no compiled code or the code was produced by the
899 // tier1 profiler return 0 for the code size. This should
900 // probably be based on the compilation level of the nmethod but
901 // that currently isn't properly recorded.
902 if (code == NULL ||
903 (TieredCompilation && code->compiler() != NULL && code->compiler()->is_c1())) {
904 return 0;
905 }
906 return code->code_end() - code->verified_entry_point();
907 )
908 }
909
910 // ------------------------------------------------------------------
911 // ciMethod::log_nmethod_identity
912 void ciMethod::log_nmethod_identity(xmlStream* log) {
913 GUARDED_VM_ENTRY(
914 nmethod* code = get_methodOop()->code();
915 if (code != NULL) {
916 code->log_identity(log);
917 }
918 )
919 }
920
921 // ------------------------------------------------------------------
922 // ciMethod::is_not_reached
923 bool ciMethod::is_not_reached(int bci) {
924 check_is_loaded();
925 VM_ENTRY_MARK;
926 return Interpreter::is_not_reached(
927 methodHandle(THREAD, get_methodOop()), bci);
928 }
929
930 // ------------------------------------------------------------------
931 // ciMethod::was_never_executed
932 bool ciMethod::was_executed_more_than(int times) {
933 VM_ENTRY_MARK;
934 return get_methodOop()->was_executed_more_than(times);
935 }
936
937 // ------------------------------------------------------------------
938 // ciMethod::has_unloaded_classes_in_signature
939 bool ciMethod::has_unloaded_classes_in_signature() {
940 VM_ENTRY_MARK;
941 {
942 EXCEPTION_MARK;
943 methodHandle m(THREAD, get_methodOop());
944 bool has_unloaded = methodOopDesc::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);
945 if( HAS_PENDING_EXCEPTION ) {
946 CLEAR_PENDING_EXCEPTION;
947 return true; // Declare that we may have unloaded classes
948 }
949 return has_unloaded;
950 }
951 }
952
953 // ------------------------------------------------------------------
954 // ciMethod::is_klass_loaded
955 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
956 VM_ENTRY_MARK;
957 return get_methodOop()->is_klass_loaded(refinfo_index, must_be_resolved);
958 }
959
960 // ------------------------------------------------------------------
961 // ciMethod::check_call
962 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
963 VM_ENTRY_MARK;
964 {
965 EXCEPTION_MARK;
966 HandleMark hm(THREAD);
967 constantPoolHandle pool (THREAD, get_methodOop()->constants());
968 methodHandle spec_method;
969 KlassHandle spec_klass;
970 LinkResolver::resolve_method(spec_method, spec_klass, pool, refinfo_index, THREAD);
971 if (HAS_PENDING_EXCEPTION) {
972 CLEAR_PENDING_EXCEPTION;
973 return false;
974 } else {
975 return (spec_method->is_static() == is_static);
976 }
977 }
978 return false;
979 }
980
981 // ------------------------------------------------------------------
982 // ciMethod::print_codes
983 //
984 // Print the bytecodes for this method.
985 void ciMethod::print_codes_on(outputStream* st) {
986 check_is_loaded();
987 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(st);)
988 }
989
990
991 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
992 check_is_loaded(); \
993 VM_ENTRY_MARK; \
994 return get_methodOop()->flag_accessor(); \
995 }
996
997 bool ciMethod::is_empty_method() const { FETCH_FLAG_FROM_VM(is_empty_method); }
998 bool ciMethod::is_vanilla_constructor() const { FETCH_FLAG_FROM_VM(is_vanilla_constructor); }
999 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1000 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1001 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1002 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); }
1003
1004 BCEscapeAnalyzer *ciMethod::get_bcea() {
1005 if (_bcea == NULL) {
1006 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1007 }
1008 return _bcea;
1009 }
1010
1011 ciMethodBlocks *ciMethod::get_method_blocks() {
1012 Arena *arena = CURRENT_ENV->arena();
1013 if (_method_blocks == NULL) {
1014 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1015 }
1016 return _method_blocks;
1017 }
1018
1019 #undef FETCH_FLAG_FROM_VM
1020
1021
1022 // ------------------------------------------------------------------
1023 // ciMethod::print_codes
1024 //
1025 // Print a range of the bytecodes for this method.
1026 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1027 check_is_loaded();
1028 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(from, to, st);)
1029 }
1030
1031 // ------------------------------------------------------------------
1032 // ciMethod::print_name
1033 //
1034 // Print the name of this method, including signature and some flags.
1035 void ciMethod::print_name(outputStream* st) {
1036 check_is_loaded();
1037 GUARDED_VM_ENTRY(get_methodOop()->print_name(st);)
1038 }
1039
1040 // ------------------------------------------------------------------
1041 // ciMethod::print_short_name
1042 //
1043 // Print the name of this method, without signature.
1044 void ciMethod::print_short_name(outputStream* st) {
1045 check_is_loaded();
1046 GUARDED_VM_ENTRY(get_methodOop()->print_short_name(st);)
1047 }
1048
1049 // ------------------------------------------------------------------
1050 // ciMethod::print_impl
1051 //
1052 // Implementation of the print method.
1053 void ciMethod::print_impl(outputStream* st) {
1054 ciObject::print_impl(st);
1055 st->print(" name=");
1056 name()->print_symbol_on(st);
1057 st->print(" holder=");
1058 holder()->print_name_on(st);
1059 st->print(" signature=");
1060 signature()->as_symbol()->print_symbol_on(st);
1061 if (is_loaded()) {
1062 st->print(" loaded=true flags=");
1063 flags().print_member_flags(st);
1064 } else {
1065 st->print(" loaded=false");
1066 }
1067 }