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