1 /*
2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "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_c1_compilable = !h_m()->is_not_c1_compilable();
53 _is_c2_compilable = !h_m()->is_not_c2_compilable();
54 // Lazy fields, filled in on demand. Require allocation.
55 _code = NULL;
56 _exception_handlers = NULL;
57 _liveness = NULL;
58 _method_blocks = NULL;
59 #if defined(COMPILER2) || defined(SHARK)
60 _flow = NULL;
61 _bcea = NULL;
62 #endif // COMPILER2 || SHARK
63
64 ciEnv *env = CURRENT_ENV;
65 if (env->jvmti_can_hotswap_or_post_breakpoint() && can_be_compiled()) {
66 // 6328518 check hotswap conditions under the right lock.
67 MutexLocker locker(Compile_lock);
68 if (Dependencies::check_evol_method(h_m()) != NULL) {
69 _is_c1_compilable = false;
70 _is_c2_compilable = false;
71 }
72 } else {
73 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
74 }
75
76 if (instanceKlass::cast(h_m()->method_holder())->is_linked()) {
77 _can_be_statically_bound = h_m()->can_be_statically_bound();
78 } else {
79 // Have to use a conservative value in this case.
80 _can_be_statically_bound = false;
81 }
82
83 // Adjust the definition of this condition to be more useful:
84 // %%% take these conditions into account in vtable generation
85 if (!_can_be_statically_bound && h_m()->is_private())
86 _can_be_statically_bound = true;
87 if (_can_be_statically_bound && h_m()->is_abstract())
88 _can_be_statically_bound = false;
89
90 // generating _signature may allow GC and therefore move m.
91 // These fields are always filled in.
92 _name = env->get_object(h_m()->name())->as_symbol();
93 _holder = env->get_object(h_m()->method_holder())->as_instance_klass();
94 ciSymbol* sig_symbol = env->get_object(h_m()->signature())->as_symbol();
95 _signature = new (env->arena()) ciSignature(_holder, sig_symbol);
96 _method_data = NULL;
97 // Take a snapshot of these values, so they will be commensurate with the MDO.
98 if (ProfileInterpreter || TieredCompilation) {
99 int invcnt = h_m()->interpreter_invocation_count();
100 // if the value overflowed report it as max int
101 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
102 _interpreter_throwout_count = h_m()->interpreter_throwout_count();
103 } else {
104 _interpreter_invocation_count = 0;
105 _interpreter_throwout_count = 0;
106 }
107 if (_interpreter_invocation_count == 0)
108 _interpreter_invocation_count = 1;
109 }
110
111
112 // ------------------------------------------------------------------
113 // ciMethod::ciMethod
114 //
115 // Unloaded method.
116 ciMethod::ciMethod(ciInstanceKlass* holder,
117 ciSymbol* name,
118 ciSymbol* signature) : ciObject(ciMethodKlass::make()) {
119 // These fields are always filled in.
120 _name = name;
121 _holder = holder;
122 _signature = new (CURRENT_ENV->arena()) ciSignature(_holder, signature);
123 _intrinsic_id = vmIntrinsics::_none;
124 _liveness = NULL;
125 _can_be_statically_bound = false;
126 _method_blocks = NULL;
127 _method_data = NULL;
128 #if defined(COMPILER2) || defined(SHARK)
129 _flow = NULL;
130 _bcea = NULL;
131 #endif // COMPILER2 || SHARK
132 }
133
134
135 // ------------------------------------------------------------------
136 // ciMethod::load_code
137 //
138 // Load the bytecodes and exception handler table for this method.
139 void ciMethod::load_code() {
140 VM_ENTRY_MARK;
141 assert(is_loaded(), "only loaded methods have code");
142
143 methodOop me = get_methodOop();
144 Arena* arena = CURRENT_THREAD_ENV->arena();
145
146 // Load the bytecodes.
147 _code = (address)arena->Amalloc(code_size());
148 memcpy(_code, me->code_base(), code_size());
149
150 // Revert any breakpoint bytecodes in ci's copy
151 if (me->number_of_breakpoints() > 0) {
152 BreakpointInfo* bp = instanceKlass::cast(me->method_holder())->breakpoints();
153 for (; bp != NULL; bp = bp->next()) {
154 if (bp->match(me)) {
155 code_at_put(bp->bci(), bp->orig_bytecode());
156 }
157 }
158 }
159
160 // And load the exception table.
161 typeArrayOop exc_table = me->exception_table();
162
163 // Allocate one extra spot in our list of exceptions. This
164 // last entry will be used to represent the possibility that
165 // an exception escapes the method. See ciExceptionHandlerStream
166 // for details.
167 _exception_handlers =
168 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
169 * (_handler_count + 1));
170 if (_handler_count > 0) {
171 for (int i=0; i<_handler_count; i++) {
172 int base = i*4;
173 _exception_handlers[i] = new (arena) ciExceptionHandler(
174 holder(),
175 /* start */ exc_table->int_at(base),
176 /* limit */ exc_table->int_at(base+1),
177 /* goto pc */ exc_table->int_at(base+2),
178 /* cp index */ exc_table->int_at(base+3));
179 }
180 }
181
182 // Put an entry at the end of our list to represent the possibility
183 // of exceptional exit.
184 _exception_handlers[_handler_count] =
185 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
186
187 if (CIPrintMethodCodes) {
188 print_codes();
189 }
190 }
191
192
193 // ------------------------------------------------------------------
194 // ciMethod::has_linenumber_table
195 //
196 // length unknown until decompression
197 bool ciMethod::has_linenumber_table() const {
198 check_is_loaded();
199 VM_ENTRY_MARK;
200 return get_methodOop()->has_linenumber_table();
201 }
202
203
204 // ------------------------------------------------------------------
205 // ciMethod::compressed_linenumber_table
206 u_char* ciMethod::compressed_linenumber_table() const {
207 check_is_loaded();
208 VM_ENTRY_MARK;
209 return get_methodOop()->compressed_linenumber_table();
210 }
211
212
213 // ------------------------------------------------------------------
214 // ciMethod::line_number_from_bci
215 int ciMethod::line_number_from_bci(int bci) const {
216 check_is_loaded();
217 VM_ENTRY_MARK;
218 return get_methodOop()->line_number_from_bci(bci);
219 }
220
221
222 // ------------------------------------------------------------------
223 // ciMethod::vtable_index
224 //
225 // Get the position of this method's entry in the vtable, if any.
226 int ciMethod::vtable_index() {
227 check_is_loaded();
228 assert(holder()->is_linked(), "must be linked");
229 VM_ENTRY_MARK;
230 return get_methodOop()->vtable_index();
231 }
232
233
234 #ifdef SHARK
235 // ------------------------------------------------------------------
236 // ciMethod::itable_index
237 //
238 // Get the position of this method's entry in the itable, if any.
239 int ciMethod::itable_index() {
240 check_is_loaded();
241 assert(holder()->is_linked(), "must be linked");
242 VM_ENTRY_MARK;
243 return klassItable::compute_itable_index(get_methodOop());
244 }
245 #endif // SHARK
246
247
248 // ------------------------------------------------------------------
249 // ciMethod::native_entry
250 //
251 // Get the address of this method's native code, if any.
252 address ciMethod::native_entry() {
253 check_is_loaded();
254 assert(flags().is_native(), "must be native method");
255 VM_ENTRY_MARK;
256 methodOop method = get_methodOop();
257 address entry = method->native_function();
258 assert(entry != NULL, "must be valid entry point");
259 return entry;
260 }
261
262
263 // ------------------------------------------------------------------
264 // ciMethod::interpreter_entry
265 //
266 // Get the entry point for running this method in the interpreter.
267 address ciMethod::interpreter_entry() {
268 check_is_loaded();
269 VM_ENTRY_MARK;
270 methodHandle mh(THREAD, get_methodOop());
271 return Interpreter::entry_for_method(mh);
272 }
273
274
275 // ------------------------------------------------------------------
276 // ciMethod::uses_balanced_monitors
277 //
278 // Does this method use monitors in a strict stack-disciplined manner?
279 bool ciMethod::has_balanced_monitors() {
280 check_is_loaded();
281 if (_balanced_monitors) return true;
282
283 // Analyze the method to see if monitors are used properly.
284 VM_ENTRY_MARK;
285 methodHandle method(THREAD, get_methodOop());
286 assert(method->has_monitor_bytecodes(), "should have checked this");
287
288 // Check to see if a previous compilation computed the
289 // monitor-matching analysis.
290 if (method->guaranteed_monitor_matching()) {
291 _balanced_monitors = true;
292 return true;
293 }
294
295 {
296 EXCEPTION_MARK;
297 ResourceMark rm(THREAD);
298 GeneratePairingInfo gpi(method);
299 gpi.compute_map(CATCH);
300 if (!gpi.monitor_safe()) {
301 return false;
302 }
303 method->set_guaranteed_monitor_matching();
304 _balanced_monitors = true;
305 }
306 return true;
307 }
308
309
310 // ------------------------------------------------------------------
311 // ciMethod::get_flow_analysis
312 ciTypeFlow* ciMethod::get_flow_analysis() {
313 #if defined(COMPILER2) || defined(SHARK)
314 if (_flow == NULL) {
315 ciEnv* env = CURRENT_ENV;
316 _flow = new (env->arena()) ciTypeFlow(env, this);
317 _flow->do_flow();
318 }
319 return _flow;
320 #else // COMPILER2 || SHARK
321 ShouldNotReachHere();
322 return NULL;
323 #endif // COMPILER2 || SHARK
324 }
325
326
327 // ------------------------------------------------------------------
328 // ciMethod::get_osr_flow_analysis
329 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
330 #if defined(COMPILER2) || defined(SHARK)
331 // OSR entry points are always place after a call bytecode of some sort
332 assert(osr_bci >= 0, "must supply valid OSR entry point");
333 ciEnv* env = CURRENT_ENV;
334 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
335 flow->do_flow();
336 return flow;
337 #else // COMPILER2 || SHARK
338 ShouldNotReachHere();
339 return NULL;
340 #endif // COMPILER2 || SHARK
341 }
342
343 // ------------------------------------------------------------------
344 // ciMethod::raw_liveness_at_bci
345 //
346 // Which local variables are live at a specific bci?
347 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
348 check_is_loaded();
349 if (_liveness == NULL) {
350 // Create the liveness analyzer.
351 Arena* arena = CURRENT_ENV->arena();
352 _liveness = new (arena) MethodLiveness(arena, this);
353 _liveness->compute_liveness();
354 }
355 return _liveness->get_liveness_at(bci);
356 }
357
358 // ------------------------------------------------------------------
359 // ciMethod::liveness_at_bci
360 //
361 // Which local variables are live at a specific bci? When debugging
362 // will return true for all locals in some cases to improve debug
363 // information.
364 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
365 MethodLivenessResult result = raw_liveness_at_bci(bci);
366 if (CURRENT_ENV->jvmti_can_access_local_variables() || DeoptimizeALot || CompileTheWorld) {
367 // Keep all locals live for the user's edification and amusement.
368 result.at_put_range(0, result.size(), true);
369 }
370 return result;
371 }
372
373 // ciMethod::live_local_oops_at_bci
374 //
375 // find all the live oops in the locals array for a particular bci
376 // Compute what the interpreter believes by using the interpreter
377 // oopmap generator. This is used as a double check during osr to
378 // guard against conservative result from MethodLiveness making us
379 // think a dead oop is live. MethodLiveness is conservative in the
380 // sense that it may consider locals to be live which cannot be live,
381 // like in the case where a local could contain an oop or a primitive
382 // along different paths. In that case the local must be dead when
383 // those paths merge. Since the interpreter's viewpoint is used when
384 // gc'ing an interpreter frame we need to use its viewpoint during
385 // OSR when loading the locals.
386
387 BitMap ciMethod::live_local_oops_at_bci(int bci) {
388 VM_ENTRY_MARK;
389 InterpreterOopMap mask;
390 OopMapCache::compute_one_oop_map(get_methodOop(), bci, &mask);
391 int mask_size = max_locals();
392 BitMap result(mask_size);
393 result.clear();
394 int i;
395 for (i = 0; i < mask_size ; i++ ) {
396 if (mask.is_oop(i)) result.set_bit(i);
397 }
398 return result;
399 }
400
401
402 #ifdef COMPILER1
403 // ------------------------------------------------------------------
404 // ciMethod::bci_block_start
405 //
406 // Marks all bcis where a new basic block starts
407 const BitMap ciMethod::bci_block_start() {
408 check_is_loaded();
409 if (_liveness == NULL) {
410 // Create the liveness analyzer.
411 Arena* arena = CURRENT_ENV->arena();
412 _liveness = new (arena) MethodLiveness(arena, this);
413 _liveness->compute_liveness();
414 }
415
416 return _liveness->get_bci_block_start();
417 }
418 #endif // COMPILER1
419
420
421 // ------------------------------------------------------------------
422 // ciMethod::call_profile_at_bci
423 //
424 // Get the ciCallProfile for the invocation of this method.
425 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
426 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
427 ResourceMark rm;
428 ciCallProfile result;
429 if (method_data() != NULL && method_data()->is_mature()) {
430 ciProfileData* data = method_data()->bci_to_data(bci);
431 if (data != NULL && data->is_CounterData()) {
432 // Every profiled call site has a counter.
433 int count = data->as_CounterData()->count();
434
435 if (!data->is_ReceiverTypeData()) {
436 result._receiver_count[0] = 0; // that's a definite zero
437 } else { // ReceiverTypeData is a subclass of CounterData
438 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
439 // In addition, virtual call sites have receiver type information
440 int receivers_count_total = 0;
441 int morphism = 0;
442 // Precompute morphism for the possible fixup
443 for (uint i = 0; i < call->row_limit(); i++) {
444 ciKlass* receiver = call->receiver(i);
445 if (receiver == NULL) continue;
446 morphism++;
447 }
448 int epsilon = 0;
449 if (TieredCompilation && ProfileInterpreter) {
450 // Interpreter and C1 treat final and special invokes differently.
451 // C1 will record a type, whereas the interpreter will just
452 // increment the count. Detect this case.
453 if (morphism == 1 && count > 0) {
454 epsilon = count;
455 count = 0;
456 }
457 }
458 for (uint i = 0; i < call->row_limit(); i++) {
459 ciKlass* receiver = call->receiver(i);
460 if (receiver == NULL) continue;
461 int rcount = call->receiver_count(i) + epsilon;
462 if (rcount == 0) rcount = 1; // Should be valid value
463 receivers_count_total += rcount;
464 // Add the receiver to result data.
465 result.add_receiver(receiver, rcount);
466 // If we extend profiling to record methods,
467 // we will set result._method also.
468 }
469 // Determine call site's morphism.
470 // The call site count is 0 with known morphism (onlt 1 or 2 receivers)
471 // or < 0 in the case of a type check failured for checkcast, aastore, instanceof.
472 // The call site count is > 0 in the case of a polymorphic virtual call.
473 if (morphism > 0 && morphism == result._limit) {
474 // The morphism <= MorphismLimit.
475 if ((morphism < ciCallProfile::MorphismLimit) ||
476 (morphism == ciCallProfile::MorphismLimit && count == 0)) {
477 #ifdef ASSERT
478 if (count > 0) {
479 this->print_short_name(tty);
480 tty->print_cr(" @ bci:%d", bci);
481 this->print_codes();
482 assert(false, "this call site should not be polymorphic");
483 }
484 #endif
485 result._morphism = morphism;
486 }
487 }
488 // Make the count consistent if this is a call profile. If count is
489 // zero or less, presume that this is a typecheck profile and
490 // do nothing. Otherwise, increase count to be the sum of all
491 // receiver's counts.
492 if (count >= 0) {
493 count += receivers_count_total;
494 }
495 }
496 result._count = count;
497 }
498 }
499 return result;
500 }
501
502 // ------------------------------------------------------------------
503 // Add new receiver and sort data by receiver's profile count.
504 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
505 // Add new receiver and sort data by receiver's counts when we have space
506 // for it otherwise replace the less called receiver (less called receiver
507 // is placed to the last array element which is not used).
508 // First array's element contains most called receiver.
509 int i = _limit;
510 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
511 _receiver[i] = _receiver[i-1];
512 _receiver_count[i] = _receiver_count[i-1];
513 }
514 _receiver[i] = receiver;
515 _receiver_count[i] = receiver_count;
516 if (_limit < MorphismLimit) _limit++;
517 }
518
519 // ------------------------------------------------------------------
520 // ciMethod::find_monomorphic_target
521 //
522 // Given a certain calling environment, find the monomorphic target
523 // for the call. Return NULL if the call is not monomorphic in
524 // its calling environment, or if there are only abstract methods.
525 // The returned method is never abstract.
526 // Note: If caller uses a non-null result, it must inform dependencies
527 // via assert_unique_concrete_method or assert_leaf_type.
528 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
529 ciInstanceKlass* callee_holder,
530 ciInstanceKlass* actual_recv) {
531 check_is_loaded();
532
533 if (actual_recv->is_interface()) {
534 // %%% We cannot trust interface types, yet. See bug 6312651.
535 return NULL;
536 }
537
538 ciMethod* root_m = resolve_invoke(caller, actual_recv);
539 if (root_m == NULL) {
540 // Something went wrong looking up the actual receiver method.
541 return NULL;
542 }
543 assert(!root_m->is_abstract(), "resolve_invoke promise");
544
545 // Make certain quick checks even if UseCHA is false.
546
547 // Is it private or final?
548 if (root_m->can_be_statically_bound()) {
549 return root_m;
550 }
551
552 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
553 // Easy case. There is no other place to put a method, so don't bother
554 // to go through the VM_ENTRY_MARK and all the rest.
555 return root_m;
556 }
557
558 // Array methods (clone, hashCode, etc.) are always statically bound.
559 // If we were to see an array type here, we'd return root_m.
560 // However, this method processes only ciInstanceKlasses. (See 4962591.)
561 // The inline_native_clone intrinsic narrows Object to T[] properly,
562 // so there is no need to do the same job here.
563
564 if (!UseCHA) return NULL;
565
566 VM_ENTRY_MARK;
567
568 methodHandle target;
569 {
570 MutexLocker locker(Compile_lock);
571 klassOop context = actual_recv->get_klassOop();
572 target = Dependencies::find_unique_concrete_method(context,
573 root_m->get_methodOop());
574 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
575 }
576
577 #ifndef PRODUCT
578 if (TraceDependencies && target() != NULL && target() != root_m->get_methodOop()) {
579 tty->print("found a non-root unique target method");
580 tty->print_cr(" context = %s", instanceKlass::cast(actual_recv->get_klassOop())->external_name());
581 tty->print(" method = ");
582 target->print_short_name(tty);
583 tty->cr();
584 }
585 #endif //PRODUCT
586
587 if (target() == NULL) {
588 return NULL;
589 }
590 if (target() == root_m->get_methodOop()) {
591 return root_m;
592 }
593 if (!root_m->is_public() &&
594 !root_m->is_protected()) {
595 // If we are going to reason about inheritance, it's easiest
596 // if the method in question is public, protected, or private.
597 // If the answer is not root_m, it is conservatively correct
598 // to return NULL, even if the CHA encountered irrelevant
599 // methods in other packages.
600 // %%% TO DO: Work out logic for package-private methods
601 // with the same name but different vtable indexes.
602 return NULL;
603 }
604 return CURRENT_THREAD_ENV->get_object(target())->as_method();
605 }
606
607 // ------------------------------------------------------------------
608 // ciMethod::resolve_invoke
609 //
610 // Given a known receiver klass, find the target for the call.
611 // Return NULL if the call has no target or the target is abstract.
612 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver) {
613 check_is_loaded();
614 VM_ENTRY_MARK;
615
616 KlassHandle caller_klass (THREAD, caller->get_klassOop());
617 KlassHandle h_recv (THREAD, exact_receiver->get_klassOop());
618 KlassHandle h_resolved (THREAD, holder()->get_klassOop());
619 symbolHandle h_name (THREAD, name()->get_symbolOop());
620 symbolHandle h_signature (THREAD, signature()->get_symbolOop());
621
622 methodHandle m;
623 // Only do exact lookup if receiver klass has been linked. Otherwise,
624 // the vtable has not been setup, and the LinkResolver will fail.
625 if (h_recv->oop_is_javaArray()
626 ||
627 instanceKlass::cast(h_recv())->is_linked() && !exact_receiver->is_interface()) {
628 if (holder()->is_interface()) {
629 m = LinkResolver::resolve_interface_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass);
630 } else {
631 m = LinkResolver::resolve_virtual_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass);
632 }
633 }
634
635 if (m.is_null()) {
636 // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
637 return NULL;
638 }
639
640 ciMethod* result = this;
641 if (m() != get_methodOop()) {
642 result = CURRENT_THREAD_ENV->get_object(m())->as_method();
643 }
644
645 // Don't return abstract methods because they aren't
646 // optimizable or interesting.
647 if (result->is_abstract()) {
648 return NULL;
649 } else {
650 return result;
651 }
652 }
653
654 // ------------------------------------------------------------------
655 // ciMethod::resolve_vtable_index
656 //
657 // Given a known receiver klass, find the vtable index for the call.
658 // Return methodOopDesc::invalid_vtable_index if the vtable_index is unknown.
659 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
660 check_is_loaded();
661
662 int vtable_index = methodOopDesc::invalid_vtable_index;
663 // Only do lookup if receiver klass has been linked. Otherwise,
664 // the vtable has not been setup, and the LinkResolver will fail.
665 if (!receiver->is_interface()
666 && (!receiver->is_instance_klass() ||
667 receiver->as_instance_klass()->is_linked())) {
668 VM_ENTRY_MARK;
669
670 KlassHandle caller_klass (THREAD, caller->get_klassOop());
671 KlassHandle h_recv (THREAD, receiver->get_klassOop());
672 symbolHandle h_name (THREAD, name()->get_symbolOop());
673 symbolHandle h_signature (THREAD, signature()->get_symbolOop());
674
675 vtable_index = LinkResolver::resolve_virtual_vtable_index(h_recv, h_recv, h_name, h_signature, caller_klass);
676 if (vtable_index == methodOopDesc::nonvirtual_vtable_index) {
677 // A statically bound method. Return "no such index".
678 vtable_index = methodOopDesc::invalid_vtable_index;
679 }
680 }
681
682 return vtable_index;
683 }
684
685 // ------------------------------------------------------------------
686 // ciMethod::interpreter_call_site_count
687 int ciMethod::interpreter_call_site_count(int bci) {
688 if (method_data() != NULL) {
689 ResourceMark rm;
690 ciProfileData* data = method_data()->bci_to_data(bci);
691 if (data != NULL && data->is_CounterData()) {
692 return scale_count(data->as_CounterData()->count());
693 }
694 }
695 return -1; // unknown
696 }
697
698 // ------------------------------------------------------------------
699 // Adjust a CounterData count to be commensurate with
700 // interpreter_invocation_count. If the MDO exists for
701 // only 25% of the time the method exists, then the
702 // counts in the MDO should be scaled by 4X, so that
703 // they can be usefully and stably compared against the
704 // invocation counts in methods.
705 int ciMethod::scale_count(int count, float prof_factor) {
706 if (count > 0 && method_data() != NULL) {
707 int counter_life;
708 int method_life = interpreter_invocation_count();
709 if (TieredCompilation) {
710 // In tiered the MDO's life is measured directly, so just use the snapshotted counters
711 counter_life = MAX2(method_data()->invocation_count(), method_data()->backedge_count());
712 } else {
713 int current_mileage = method_data()->current_mileage();
714 int creation_mileage = method_data()->creation_mileage();
715 counter_life = current_mileage - creation_mileage;
716 }
717
718 // counter_life due to backedge_counter could be > method_life
719 if (counter_life > method_life)
720 counter_life = method_life;
721 if (0 < counter_life && counter_life <= method_life) {
722 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
723 count = (count > 0) ? count : 1;
724 }
725 }
726 return count;
727 }
728
729 // ------------------------------------------------------------------
730 // invokedynamic support
731
732 // ------------------------------------------------------------------
733 // ciMethod::is_method_handle_invoke
734 //
735 // Return true if the method is an instance of one of the two
736 // signature-polymorphic MethodHandle methods, invokeExact or invokeGeneric.
737 bool ciMethod::is_method_handle_invoke() const {
738 if (!is_loaded()) return false;
739 VM_ENTRY_MARK;
740 return get_methodOop()->is_method_handle_invoke();
741 }
742
743 // ------------------------------------------------------------------
744 // ciMethod::is_method_handle_adapter
745 //
746 // Return true if the method is a generated MethodHandle adapter.
747 // These are built by MethodHandleCompiler.
748 bool ciMethod::is_method_handle_adapter() const {
749 if (!is_loaded()) return false;
750 VM_ENTRY_MARK;
751 return get_methodOop()->is_method_handle_adapter();
752 }
753
754 ciInstance* ciMethod::method_handle_type() {
755 check_is_loaded();
756 VM_ENTRY_MARK;
757 oop mtype = get_methodOop()->method_handle_type();
758 return CURRENT_THREAD_ENV->get_object(mtype)->as_instance();
759 }
760
761
762 // ------------------------------------------------------------------
763 // ciMethod::build_method_data
764 //
765 // Generate new methodDataOop objects at compile time.
766 void ciMethod::build_method_data(methodHandle h_m) {
767 EXCEPTION_CONTEXT;
768 if (is_native() || is_abstract() || h_m()->is_accessor()) return;
769 if (h_m()->method_data() == NULL) {
770 methodOopDesc::build_interpreter_method_data(h_m, THREAD);
771 if (HAS_PENDING_EXCEPTION) {
772 CLEAR_PENDING_EXCEPTION;
773 }
774 }
775 if (h_m()->method_data() != NULL) {
776 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data();
777 _method_data->load_data();
778 } else {
779 _method_data = CURRENT_ENV->get_empty_methodData();
780 }
781 }
782
783 // public, retroactive version
784 void ciMethod::build_method_data() {
785 if (_method_data == NULL || _method_data->is_empty()) {
786 GUARDED_VM_ENTRY({
787 build_method_data(get_methodOop());
788 });
789 }
790 }
791
792
793 // ------------------------------------------------------------------
794 // ciMethod::method_data
795 //
796 ciMethodData* ciMethod::method_data() {
797 if (_method_data != NULL) {
798 return _method_data;
799 }
800 VM_ENTRY_MARK;
801 ciEnv* env = CURRENT_ENV;
802 Thread* my_thread = JavaThread::current();
803 methodHandle h_m(my_thread, get_methodOop());
804
805 // Create an MDO for the inlinee
806 if (TieredCompilation && is_c1_compile(env->comp_level())) {
807 build_method_data(h_m);
808 }
809
810 if (h_m()->method_data() != NULL) {
811 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data();
812 _method_data->load_data();
813 } else {
814 _method_data = CURRENT_ENV->get_empty_methodData();
815 }
816 return _method_data;
817
818 }
819
820
821 // ------------------------------------------------------------------
822 // ciMethod::will_link
823 //
824 // Will this method link in a specific calling context?
825 bool ciMethod::will_link(ciKlass* accessing_klass,
826 ciKlass* declared_method_holder,
827 Bytecodes::Code bc) {
828 if (!is_loaded()) {
829 // Method lookup failed.
830 return false;
831 }
832
833 // The link checks have been front-loaded into the get_method
834 // call. This method (ciMethod::will_link()) will be removed
835 // in the future.
836
837 return true;
838 }
839
840 // ------------------------------------------------------------------
841 // ciMethod::should_exclude
842 //
843 // Should this method be excluded from compilation?
844 bool ciMethod::should_exclude() {
845 check_is_loaded();
846 VM_ENTRY_MARK;
847 methodHandle mh(THREAD, get_methodOop());
848 bool ignore;
849 return CompilerOracle::should_exclude(mh, ignore);
850 }
851
852 // ------------------------------------------------------------------
853 // ciMethod::should_inline
854 //
855 // Should this method be inlined during compilation?
856 bool ciMethod::should_inline() {
857 check_is_loaded();
858 VM_ENTRY_MARK;
859 methodHandle mh(THREAD, get_methodOop());
860 return CompilerOracle::should_inline(mh);
861 }
862
863 // ------------------------------------------------------------------
864 // ciMethod::should_not_inline
865 //
866 // Should this method be disallowed from inlining during compilation?
867 bool ciMethod::should_not_inline() {
868 check_is_loaded();
869 VM_ENTRY_MARK;
870 methodHandle mh(THREAD, get_methodOop());
871 return CompilerOracle::should_not_inline(mh);
872 }
873
874 // ------------------------------------------------------------------
875 // ciMethod::should_print_assembly
876 //
877 // Should the compiler print the generated code for this method?
878 bool ciMethod::should_print_assembly() {
879 check_is_loaded();
880 VM_ENTRY_MARK;
881 methodHandle mh(THREAD, get_methodOop());
882 return CompilerOracle::should_print(mh);
883 }
884
885 // ------------------------------------------------------------------
886 // ciMethod::break_at_execute
887 //
888 // Should the compiler insert a breakpoint into the generated code
889 // method?
890 bool ciMethod::break_at_execute() {
891 check_is_loaded();
892 VM_ENTRY_MARK;
893 methodHandle mh(THREAD, get_methodOop());
894 return CompilerOracle::should_break_at(mh);
895 }
896
897 // ------------------------------------------------------------------
898 // ciMethod::has_option
899 //
900 bool ciMethod::has_option(const char* option) {
901 check_is_loaded();
902 VM_ENTRY_MARK;
903 methodHandle mh(THREAD, get_methodOop());
904 return CompilerOracle::has_option_string(mh, option);
905 }
906
907 // ------------------------------------------------------------------
908 // ciMethod::can_be_compiled
909 //
910 // Have previous compilations of this method succeeded?
911 bool ciMethod::can_be_compiled() {
912 check_is_loaded();
913 ciEnv* env = CURRENT_ENV;
914 if (is_c1_compile(env->comp_level())) {
915 return _is_c1_compilable;
916 }
917 return _is_c2_compilable;
918 }
919
920 // ------------------------------------------------------------------
921 // ciMethod::set_not_compilable
922 //
923 // Tell the VM that this method cannot be compiled at all.
924 void ciMethod::set_not_compilable() {
925 check_is_loaded();
926 VM_ENTRY_MARK;
927 ciEnv* env = CURRENT_ENV;
928 if (is_c1_compile(env->comp_level())) {
929 _is_c1_compilable = false;
930 } else {
931 _is_c2_compilable = false;
932 }
933 get_methodOop()->set_not_compilable(env->comp_level());
934 }
935
936 // ------------------------------------------------------------------
937 // ciMethod::can_be_osr_compiled
938 //
939 // Have previous compilations of this method succeeded?
940 //
941 // Implementation note: the VM does not currently keep track
942 // of failed OSR compilations per bci. The entry_bci parameter
943 // is currently unused.
944 bool ciMethod::can_be_osr_compiled(int entry_bci) {
945 check_is_loaded();
946 VM_ENTRY_MARK;
947 ciEnv* env = CURRENT_ENV;
948 return !get_methodOop()->is_not_osr_compilable(env->comp_level());
949 }
950
951 // ------------------------------------------------------------------
952 // ciMethod::has_compiled_code
953 bool ciMethod::has_compiled_code() {
954 VM_ENTRY_MARK;
955 return get_methodOop()->code() != NULL;
956 }
957
958 int ciMethod::comp_level() {
959 check_is_loaded();
960 VM_ENTRY_MARK;
961 nmethod* nm = get_methodOop()->code();
962 if (nm != NULL) return nm->comp_level();
963 return 0;
964 }
965
966 // ------------------------------------------------------------------
967 // ciMethod::instructions_size
968 //
969 // This is a rough metric for "fat" methods, compared before inlining
970 // with InlineSmallCode. The CodeBlob::code_size accessor includes
971 // junk like exception handler, stubs, and constant table, which are
972 // not highly relevant to an inlined method. So we use the more
973 // specific accessor nmethod::insts_size.
974 int ciMethod::instructions_size(int comp_level) {
975 GUARDED_VM_ENTRY(
976 nmethod* code = get_methodOop()->code();
977 if (code != NULL && (comp_level == CompLevel_any || comp_level == code->comp_level())) {
978 return code->code_end() - code->verified_entry_point();
979 }
980 return 0;
981 )
982 }
983
984 // ------------------------------------------------------------------
985 // ciMethod::log_nmethod_identity
986 void ciMethod::log_nmethod_identity(xmlStream* log) {
987 GUARDED_VM_ENTRY(
988 nmethod* code = get_methodOop()->code();
989 if (code != NULL) {
990 code->log_identity(log);
991 }
992 )
993 }
994
995 // ------------------------------------------------------------------
996 // ciMethod::is_not_reached
997 bool ciMethod::is_not_reached(int bci) {
998 check_is_loaded();
999 VM_ENTRY_MARK;
1000 return Interpreter::is_not_reached(
1001 methodHandle(THREAD, get_methodOop()), bci);
1002 }
1003
1004 // ------------------------------------------------------------------
1005 // ciMethod::was_never_executed
1006 bool ciMethod::was_executed_more_than(int times) {
1007 VM_ENTRY_MARK;
1008 return get_methodOop()->was_executed_more_than(times);
1009 }
1010
1011 // ------------------------------------------------------------------
1012 // ciMethod::has_unloaded_classes_in_signature
1013 bool ciMethod::has_unloaded_classes_in_signature() {
1014 VM_ENTRY_MARK;
1015 {
1016 EXCEPTION_MARK;
1017 methodHandle m(THREAD, get_methodOop());
1018 bool has_unloaded = methodOopDesc::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);
1019 if( HAS_PENDING_EXCEPTION ) {
1020 CLEAR_PENDING_EXCEPTION;
1021 return true; // Declare that we may have unloaded classes
1022 }
1023 return has_unloaded;
1024 }
1025 }
1026
1027 // ------------------------------------------------------------------
1028 // ciMethod::is_klass_loaded
1029 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1030 VM_ENTRY_MARK;
1031 return get_methodOop()->is_klass_loaded(refinfo_index, must_be_resolved);
1032 }
1033
1034 // ------------------------------------------------------------------
1035 // ciMethod::check_call
1036 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1037 VM_ENTRY_MARK;
1038 {
1039 EXCEPTION_MARK;
1040 HandleMark hm(THREAD);
1041 constantPoolHandle pool (THREAD, get_methodOop()->constants());
1042 methodHandle spec_method;
1043 KlassHandle spec_klass;
1044 LinkResolver::resolve_method(spec_method, spec_klass, pool, refinfo_index, THREAD);
1045 if (HAS_PENDING_EXCEPTION) {
1046 CLEAR_PENDING_EXCEPTION;
1047 return false;
1048 } else {
1049 return (spec_method->is_static() == is_static);
1050 }
1051 }
1052 return false;
1053 }
1054
1055 // ------------------------------------------------------------------
1056 // ciMethod::print_codes
1057 //
1058 // Print the bytecodes for this method.
1059 void ciMethod::print_codes_on(outputStream* st) {
1060 check_is_loaded();
1061 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(st);)
1062 }
1063
1064
1065 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1066 check_is_loaded(); \
1067 VM_ENTRY_MARK; \
1068 return get_methodOop()->flag_accessor(); \
1069 }
1070
1071 bool ciMethod::is_empty_method() const { FETCH_FLAG_FROM_VM(is_empty_method); }
1072 bool ciMethod::is_vanilla_constructor() const { FETCH_FLAG_FROM_VM(is_vanilla_constructor); }
1073 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1074 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1075 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1076 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); }
1077
1078 BCEscapeAnalyzer *ciMethod::get_bcea() {
1079 #ifdef COMPILER2
1080 if (_bcea == NULL) {
1081 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1082 }
1083 return _bcea;
1084 #else // COMPILER2
1085 ShouldNotReachHere();
1086 return NULL;
1087 #endif // COMPILER2
1088 }
1089
1090 ciMethodBlocks *ciMethod::get_method_blocks() {
1091 Arena *arena = CURRENT_ENV->arena();
1092 if (_method_blocks == NULL) {
1093 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1094 }
1095 return _method_blocks;
1096 }
1097
1098 #undef FETCH_FLAG_FROM_VM
1099
1100
1101 // ------------------------------------------------------------------
1102 // ciMethod::print_codes
1103 //
1104 // Print a range of the bytecodes for this method.
1105 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1106 check_is_loaded();
1107 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(from, to, st);)
1108 }
1109
1110 // ------------------------------------------------------------------
1111 // ciMethod::print_name
1112 //
1113 // Print the name of this method, including signature and some flags.
1114 void ciMethod::print_name(outputStream* st) {
1115 check_is_loaded();
1116 GUARDED_VM_ENTRY(get_methodOop()->print_name(st);)
1117 }
1118
1119 // ------------------------------------------------------------------
1120 // ciMethod::print_short_name
1121 //
1122 // Print the name of this method, without signature.
1123 void ciMethod::print_short_name(outputStream* st) {
1124 check_is_loaded();
1125 GUARDED_VM_ENTRY(get_methodOop()->print_short_name(st);)
1126 }
1127
1128 // ------------------------------------------------------------------
1129 // ciMethod::print_impl
1130 //
1131 // Implementation of the print method.
1132 void ciMethod::print_impl(outputStream* st) {
1133 ciObject::print_impl(st);
1134 st->print(" name=");
1135 name()->print_symbol_on(st);
1136 st->print(" holder=");
1137 holder()->print_name_on(st);
1138 st->print(" signature=");
1139 signature()->as_symbol()->print_symbol_on(st);
1140 if (is_loaded()) {
1141 st->print(" loaded=true flags=");
1142 flags().print_member_flags(st);
1143 } else {
1144 st->print(" loaded=false");
1145 }
1146 }