1 /*
2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/ciCallProfile.hpp"
27 #include "ci/ciExceptionHandler.hpp"
28 #include "ci/ciInstanceKlass.hpp"
29 #include "ci/ciMethod.hpp"
30 #include "ci/ciMethodBlocks.hpp"
31 #include "ci/ciMethodData.hpp"
32 #include "ci/ciStreams.hpp"
33 #include "ci/ciSymbol.hpp"
34 #include "ci/ciReplay.hpp"
35 #include "ci/ciUtilities.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "compiler/abstractCompiler.hpp"
38 #include "compiler/compilerOracle.hpp"
39 #include "compiler/methodLiveness.hpp"
40 #include "interpreter/interpreter.hpp"
41 #include "interpreter/linkResolver.hpp"
42 #include "interpreter/oopMapCache.hpp"
43 #include "memory/allocation.inline.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "oops/generateOopMap.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "prims/nativeLookup.hpp"
48 #include "runtime/deoptimization.hpp"
49 #include "utilities/bitMap.inline.hpp"
50 #include "utilities/xmlstream.hpp"
51 #ifdef COMPILER2
52 #include "ci/bcEscapeAnalyzer.hpp"
53 #include "ci/ciTypeFlow.hpp"
54 #include "oops/method.hpp"
55 #endif
56 #ifdef SHARK
57 #include "ci/ciTypeFlow.hpp"
58 #include "oops/method.hpp"
59 #endif
60
61 // ciMethod
62 //
63 // This class represents a Method* in the HotSpot virtual
64 // machine.
65
66
67 // ------------------------------------------------------------------
68 // ciMethod::ciMethod
69 //
70 // Loaded method.
71 ciMethod::ciMethod(methodHandle h_m) : ciMetadata(h_m()) {
72 assert(h_m() != NULL, "no null method");
73
74 // These fields are always filled in in loaded methods.
75 _flags = ciFlags(h_m()->access_flags());
76
77 // Easy to compute, so fill them in now.
78 _max_stack = h_m()->max_stack();
79 _max_locals = h_m()->max_locals();
80 _code_size = h_m()->code_size();
81 _intrinsic_id = h_m()->intrinsic_id();
82 _handler_count = h_m()->exception_table_length();
83 _uses_monitors = h_m()->access_flags().has_monitor_bytecodes();
84 _balanced_monitors = !_uses_monitors || h_m()->access_flags().is_monitor_matching();
85 _is_c1_compilable = !h_m()->is_not_c1_compilable();
86 _is_c2_compilable = !h_m()->is_not_c2_compilable();
87 // Lazy fields, filled in on demand. Require allocation.
88 _code = NULL;
89 _exception_handlers = NULL;
90 _liveness = NULL;
91 _method_blocks = NULL;
92 #if defined(COMPILER2) || defined(SHARK)
93 _flow = NULL;
94 _bcea = NULL;
95 #endif // COMPILER2 || SHARK
96
97 ciEnv *env = CURRENT_ENV;
98 if (env->jvmti_can_hotswap_or_post_breakpoint() && can_be_compiled()) {
99 // 6328518 check hotswap conditions under the right lock.
100 MutexLocker locker(Compile_lock);
101 if (Dependencies::check_evol_method(h_m()) != NULL) {
102 _is_c1_compilable = false;
103 _is_c2_compilable = false;
104 }
105 } else {
106 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
107 }
108
109 if (h_m()->method_holder()->is_linked()) {
110 _can_be_statically_bound = h_m()->can_be_statically_bound();
111 } else {
112 // Have to use a conservative value in this case.
113 _can_be_statically_bound = false;
114 }
115
116 // Adjust the definition of this condition to be more useful:
117 // %%% take these conditions into account in vtable generation
118 if (!_can_be_statically_bound && h_m()->is_private())
119 _can_be_statically_bound = true;
120 if (_can_be_statically_bound && h_m()->is_abstract())
121 _can_be_statically_bound = false;
122
123 // generating _signature may allow GC and therefore move m.
124 // These fields are always filled in.
125 _name = env->get_symbol(h_m()->name());
126 _holder = env->get_instance_klass(h_m()->method_holder());
127 ciSymbol* sig_symbol = env->get_symbol(h_m()->signature());
128 constantPoolHandle cpool = h_m()->constants();
129 _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
130 _method_data = NULL;
131 // Take a snapshot of these values, so they will be commensurate with the MDO.
132 if (ProfileInterpreter || TieredCompilation) {
133 int invcnt = h_m()->interpreter_invocation_count();
134 // if the value overflowed report it as max int
135 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
136 _interpreter_throwout_count = h_m()->interpreter_throwout_count();
137 } else {
138 _interpreter_invocation_count = 0;
139 _interpreter_throwout_count = 0;
140 }
141 if (_interpreter_invocation_count == 0)
142 _interpreter_invocation_count = 1;
143 _instructions_size = -1;
144 #ifdef ASSERT
145 if (ReplayCompiles) {
146 ciReplay::initialize(this);
147 }
148 #endif
149 }
150
151
152 // ------------------------------------------------------------------
153 // ciMethod::ciMethod
154 //
155 // Unloaded method.
156 ciMethod::ciMethod(ciInstanceKlass* holder,
157 ciSymbol* name,
158 ciSymbol* signature,
159 ciInstanceKlass* accessor) :
160 ciMetadata((Metadata*)NULL),
161 _name( name),
162 _holder( holder),
163 _intrinsic_id( vmIntrinsics::_none),
164 _liveness( NULL),
165 _can_be_statically_bound(false),
166 _method_blocks( NULL),
167 _method_data( NULL)
168 #if defined(COMPILER2) || defined(SHARK)
169 ,
170 _flow( NULL),
171 _bcea( NULL),
172 _instructions_size(-1)
173 #endif // COMPILER2 || SHARK
174 {
175 // Usually holder and accessor are the same type but in some cases
176 // the holder has the wrong class loader (e.g. invokedynamic call
177 // sites) so we pass the accessor.
178 _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
179 }
180
181
182 // ------------------------------------------------------------------
183 // ciMethod::load_code
184 //
185 // Load the bytecodes and exception handler table for this method.
186 void ciMethod::load_code() {
187 VM_ENTRY_MARK;
188 assert(is_loaded(), "only loaded methods have code");
189
190 Method* me = get_Method();
191 Arena* arena = CURRENT_THREAD_ENV->arena();
192
193 // Load the bytecodes.
194 _code = (address)arena->Amalloc(code_size());
195 memcpy(_code, me->code_base(), code_size());
196
197 // Revert any breakpoint bytecodes in ci's copy
198 if (me->number_of_breakpoints() > 0) {
199 BreakpointInfo* bp = me->method_holder()->breakpoints();
200 for (; bp != NULL; bp = bp->next()) {
201 if (bp->match(me)) {
202 code_at_put(bp->bci(), bp->orig_bytecode());
203 }
204 }
205 }
206
207 // And load the exception table.
208 ExceptionTable exc_table(me);
209
210 // Allocate one extra spot in our list of exceptions. This
211 // last entry will be used to represent the possibility that
212 // an exception escapes the method. See ciExceptionHandlerStream
213 // for details.
214 _exception_handlers =
215 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
216 * (_handler_count + 1));
217 if (_handler_count > 0) {
218 for (int i=0; i<_handler_count; i++) {
219 _exception_handlers[i] = new (arena) ciExceptionHandler(
220 holder(),
221 /* start */ exc_table.start_pc(i),
222 /* limit */ exc_table.end_pc(i),
223 /* goto pc */ exc_table.handler_pc(i),
224 /* cp index */ exc_table.catch_type_index(i));
225 }
226 }
227
228 // Put an entry at the end of our list to represent the possibility
229 // of exceptional exit.
230 _exception_handlers[_handler_count] =
231 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
232
233 if (CIPrintMethodCodes) {
234 print_codes();
235 }
236 }
237
238
239 // ------------------------------------------------------------------
240 // ciMethod::has_linenumber_table
241 //
242 // length unknown until decompression
243 bool ciMethod::has_linenumber_table() const {
244 check_is_loaded();
245 VM_ENTRY_MARK;
246 return get_Method()->has_linenumber_table();
247 }
248
249
250 // ------------------------------------------------------------------
251 // ciMethod::compressed_linenumber_table
252 u_char* ciMethod::compressed_linenumber_table() const {
253 check_is_loaded();
254 VM_ENTRY_MARK;
255 return get_Method()->compressed_linenumber_table();
256 }
257
258
259 // ------------------------------------------------------------------
260 // ciMethod::line_number_from_bci
261 int ciMethod::line_number_from_bci(int bci) const {
262 check_is_loaded();
263 VM_ENTRY_MARK;
264 return get_Method()->line_number_from_bci(bci);
265 }
266
267
268 // ------------------------------------------------------------------
269 // ciMethod::vtable_index
270 //
271 // Get the position of this method's entry in the vtable, if any.
272 int ciMethod::vtable_index() {
273 check_is_loaded();
274 assert(holder()->is_linked(), "must be linked");
275 VM_ENTRY_MARK;
276 return get_Method()->vtable_index();
277 }
278
279
280 #ifdef SHARK
281 // ------------------------------------------------------------------
282 // ciMethod::itable_index
283 //
284 // Get the position of this method's entry in the itable, if any.
285 int ciMethod::itable_index() {
286 check_is_loaded();
287 assert(holder()->is_linked(), "must be linked");
288 VM_ENTRY_MARK;
289 return klassItable::compute_itable_index(get_Method());
290 }
291 #endif // SHARK
292
293
294 // ------------------------------------------------------------------
295 // ciMethod::native_entry
296 //
297 // Get the address of this method's native code, if any.
298 address ciMethod::native_entry() {
299 check_is_loaded();
300 assert(flags().is_native(), "must be native method");
301 VM_ENTRY_MARK;
302 Method* method = get_Method();
303 address entry = method->native_function();
304 assert(entry != NULL, "must be valid entry point");
305 return entry;
306 }
307
308
309 // ------------------------------------------------------------------
310 // ciMethod::interpreter_entry
311 //
312 // Get the entry point for running this method in the interpreter.
313 address ciMethod::interpreter_entry() {
314 check_is_loaded();
315 VM_ENTRY_MARK;
316 methodHandle mh(THREAD, get_Method());
317 return Interpreter::entry_for_method(mh);
318 }
319
320
321 // ------------------------------------------------------------------
322 // ciMethod::uses_balanced_monitors
323 //
324 // Does this method use monitors in a strict stack-disciplined manner?
325 bool ciMethod::has_balanced_monitors() {
326 check_is_loaded();
327 if (_balanced_monitors) return true;
328
329 // Analyze the method to see if monitors are used properly.
330 VM_ENTRY_MARK;
331 methodHandle method(THREAD, get_Method());
332 assert(method->has_monitor_bytecodes(), "should have checked this");
333
334 // Check to see if a previous compilation computed the
335 // monitor-matching analysis.
336 if (method->guaranteed_monitor_matching()) {
337 _balanced_monitors = true;
338 return true;
339 }
340
341 {
342 EXCEPTION_MARK;
343 ResourceMark rm(THREAD);
344 GeneratePairingInfo gpi(method);
345 gpi.compute_map(CATCH);
346 if (!gpi.monitor_safe()) {
347 return false;
348 }
349 method->set_guaranteed_monitor_matching();
350 _balanced_monitors = true;
351 }
352 return true;
353 }
354
355
356 // ------------------------------------------------------------------
357 // ciMethod::get_flow_analysis
358 ciTypeFlow* ciMethod::get_flow_analysis() {
359 #if defined(COMPILER2) || defined(SHARK)
360 if (_flow == NULL) {
361 ciEnv* env = CURRENT_ENV;
362 _flow = new (env->arena()) ciTypeFlow(env, this);
363 _flow->do_flow();
364 }
365 return _flow;
366 #else // COMPILER2 || SHARK
367 ShouldNotReachHere();
368 return NULL;
369 #endif // COMPILER2 || SHARK
370 }
371
372
373 // ------------------------------------------------------------------
374 // ciMethod::get_osr_flow_analysis
375 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
376 #if defined(COMPILER2) || defined(SHARK)
377 // OSR entry points are always place after a call bytecode of some sort
378 assert(osr_bci >= 0, "must supply valid OSR entry point");
379 ciEnv* env = CURRENT_ENV;
380 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
381 flow->do_flow();
382 return flow;
383 #else // COMPILER2 || SHARK
384 ShouldNotReachHere();
385 return NULL;
386 #endif // COMPILER2 || SHARK
387 }
388
389 // ------------------------------------------------------------------
390 // ciMethod::raw_liveness_at_bci
391 //
392 // Which local variables are live at a specific bci?
393 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
394 check_is_loaded();
395 if (_liveness == NULL) {
396 // Create the liveness analyzer.
397 Arena* arena = CURRENT_ENV->arena();
398 _liveness = new (arena) MethodLiveness(arena, this);
399 _liveness->compute_liveness();
400 }
401 return _liveness->get_liveness_at(bci);
402 }
403
404 // ------------------------------------------------------------------
405 // ciMethod::liveness_at_bci
406 //
407 // Which local variables are live at a specific bci? When debugging
408 // will return true for all locals in some cases to improve debug
409 // information.
410 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
411 MethodLivenessResult result = raw_liveness_at_bci(bci);
412 if (CURRENT_ENV->jvmti_can_access_local_variables() || DeoptimizeALot || CompileTheWorld) {
413 // Keep all locals live for the user's edification and amusement.
414 result.at_put_range(0, result.size(), true);
415 }
416 return result;
417 }
418
419 // ciMethod::live_local_oops_at_bci
420 //
421 // find all the live oops in the locals array for a particular bci
422 // Compute what the interpreter believes by using the interpreter
423 // oopmap generator. This is used as a double check during osr to
424 // guard against conservative result from MethodLiveness making us
425 // think a dead oop is live. MethodLiveness is conservative in the
426 // sense that it may consider locals to be live which cannot be live,
427 // like in the case where a local could contain an oop or a primitive
428 // along different paths. In that case the local must be dead when
429 // those paths merge. Since the interpreter's viewpoint is used when
430 // gc'ing an interpreter frame we need to use its viewpoint during
431 // OSR when loading the locals.
432
433 BitMap ciMethod::live_local_oops_at_bci(int bci) {
434 VM_ENTRY_MARK;
435 InterpreterOopMap mask;
436 OopMapCache::compute_one_oop_map(get_Method(), bci, &mask);
437 int mask_size = max_locals();
438 BitMap result(mask_size);
439 result.clear();
440 int i;
441 for (i = 0; i < mask_size ; i++ ) {
442 if (mask.is_oop(i)) result.set_bit(i);
443 }
444 return result;
445 }
446
447
448 #ifdef COMPILER1
449 // ------------------------------------------------------------------
450 // ciMethod::bci_block_start
451 //
452 // Marks all bcis where a new basic block starts
453 const BitMap ciMethod::bci_block_start() {
454 check_is_loaded();
455 if (_liveness == NULL) {
456 // Create the liveness analyzer.
457 Arena* arena = CURRENT_ENV->arena();
458 _liveness = new (arena) MethodLiveness(arena, this);
459 _liveness->compute_liveness();
460 }
461
462 return _liveness->get_bci_block_start();
463 }
464 #endif // COMPILER1
465
466
467 // ------------------------------------------------------------------
468 // ciMethod::call_profile_at_bci
469 //
470 // Get the ciCallProfile for the invocation of this method.
471 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
472 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
473 ResourceMark rm;
474 ciCallProfile result;
475 if (method_data() != NULL && method_data()->is_mature()) {
476 ciProfileData* data = method_data()->bci_to_data(bci);
477 if (data != NULL && data->is_CounterData()) {
478 // Every profiled call site has a counter.
479 int count = data->as_CounterData()->count();
480
481 if (!data->is_ReceiverTypeData()) {
482 result._receiver_count[0] = 0; // that's a definite zero
483 } else { // ReceiverTypeData is a subclass of CounterData
484 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
485 // In addition, virtual call sites have receiver type information
486 int receivers_count_total = 0;
487 int morphism = 0;
488 // Precompute morphism for the possible fixup
489 for (uint i = 0; i < call->row_limit(); i++) {
490 ciKlass* receiver = call->receiver(i);
491 if (receiver == NULL) continue;
492 morphism++;
493 }
494 int epsilon = 0;
495 if (TieredCompilation && ProfileInterpreter) {
496 // Interpreter and C1 treat final and special invokes differently.
497 // C1 will record a type, whereas the interpreter will just
498 // increment the count. Detect this case.
499 if (morphism == 1 && count > 0) {
500 epsilon = count;
501 count = 0;
502 }
503 }
504 for (uint i = 0; i < call->row_limit(); i++) {
505 ciKlass* receiver = call->receiver(i);
506 if (receiver == NULL) continue;
507 int rcount = call->receiver_count(i) + epsilon;
508 if (rcount == 0) rcount = 1; // Should be valid value
509 receivers_count_total += rcount;
510 // Add the receiver to result data.
511 result.add_receiver(receiver, rcount);
512 // If we extend profiling to record methods,
513 // we will set result._method also.
514 }
515 // Determine call site's morphism.
516 // The call site count is 0 with known morphism (onlt 1 or 2 receivers)
517 // or < 0 in the case of a type check failured for checkcast, aastore, instanceof.
518 // The call site count is > 0 in the case of a polymorphic virtual call.
519 if (morphism > 0 && morphism == result._limit) {
520 // The morphism <= MorphismLimit.
521 if ((morphism < ciCallProfile::MorphismLimit) ||
522 (morphism == ciCallProfile::MorphismLimit && count == 0)) {
523 #ifdef ASSERT
524 if (count > 0) {
525 this->print_short_name(tty);
526 tty->print_cr(" @ bci:%d", bci);
527 this->print_codes();
528 assert(false, "this call site should not be polymorphic");
529 }
530 #endif
531 result._morphism = morphism;
532 }
533 }
534 // Make the count consistent if this is a call profile. If count is
535 // zero or less, presume that this is a typecheck profile and
536 // do nothing. Otherwise, increase count to be the sum of all
537 // receiver's counts.
538 if (count >= 0) {
539 count += receivers_count_total;
540 }
541 }
542 result._count = count;
543 }
544 }
545 return result;
546 }
547
548 // ------------------------------------------------------------------
549 // Add new receiver and sort data by receiver's profile count.
550 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
551 // Add new receiver and sort data by receiver's counts when we have space
552 // for it otherwise replace the less called receiver (less called receiver
553 // is placed to the last array element which is not used).
554 // First array's element contains most called receiver.
555 int i = _limit;
556 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
557 _receiver[i] = _receiver[i-1];
558 _receiver_count[i] = _receiver_count[i-1];
559 }
560 _receiver[i] = receiver;
561 _receiver_count[i] = receiver_count;
562 if (_limit < MorphismLimit) _limit++;
563 }
564
565 // ------------------------------------------------------------------
566 // ciMethod::find_monomorphic_target
567 //
568 // Given a certain calling environment, find the monomorphic target
569 // for the call. Return NULL if the call is not monomorphic in
570 // its calling environment, or if there are only abstract methods.
571 // The returned method is never abstract.
572 // Note: If caller uses a non-null result, it must inform dependencies
573 // via assert_unique_concrete_method or assert_leaf_type.
574 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
575 ciInstanceKlass* callee_holder,
576 ciInstanceKlass* actual_recv) {
577 check_is_loaded();
578
579 if (actual_recv->is_interface()) {
580 // %%% We cannot trust interface types, yet. See bug 6312651.
581 return NULL;
582 }
583
584 ciMethod* root_m = resolve_invoke(caller, actual_recv);
585 if (root_m == NULL) {
586 // Something went wrong looking up the actual receiver method.
587 return NULL;
588 }
589 assert(!root_m->is_abstract(), "resolve_invoke promise");
590
591 // Make certain quick checks even if UseCHA is false.
592
593 // Is it private or final?
594 if (root_m->can_be_statically_bound()) {
595 return root_m;
596 }
597
598 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
599 // Easy case. There is no other place to put a method, so don't bother
600 // to go through the VM_ENTRY_MARK and all the rest.
601 return root_m;
602 }
603
604 // Array methods (clone, hashCode, etc.) are always statically bound.
605 // If we were to see an array type here, we'd return root_m.
606 // However, this method processes only ciInstanceKlasses. (See 4962591.)
607 // The inline_native_clone intrinsic narrows Object to T[] properly,
608 // so there is no need to do the same job here.
609
610 if (!UseCHA) return NULL;
611
612 VM_ENTRY_MARK;
613
614 methodHandle target;
615 {
616 MutexLocker locker(Compile_lock);
617 Klass* context = actual_recv->get_Klass();
618 target = Dependencies::find_unique_concrete_method(context,
619 root_m->get_Method());
620 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
621 }
622
623 #ifndef PRODUCT
624 if (TraceDependencies && target() != NULL && target() != root_m->get_Method()) {
625 tty->print("found a non-root unique target method");
626 tty->print_cr(" context = %s", InstanceKlass::cast(actual_recv->get_Klass())->external_name());
627 tty->print(" method = ");
628 target->print_short_name(tty);
629 tty->cr();
630 }
631 #endif //PRODUCT
632
633 if (target() == NULL) {
634 return NULL;
635 }
636 if (target() == root_m->get_Method()) {
637 return root_m;
638 }
639 if (!root_m->is_public() &&
640 !root_m->is_protected()) {
641 // If we are going to reason about inheritance, it's easiest
642 // if the method in question is public, protected, or private.
643 // If the answer is not root_m, it is conservatively correct
644 // to return NULL, even if the CHA encountered irrelevant
645 // methods in other packages.
646 // %%% TO DO: Work out logic for package-private methods
647 // with the same name but different vtable indexes.
648 return NULL;
649 }
650 return CURRENT_THREAD_ENV->get_method(target());
651 }
652
653 // ------------------------------------------------------------------
654 // ciMethod::resolve_invoke
655 //
656 // Given a known receiver klass, find the target for the call.
657 // Return NULL if the call has no target or the target is abstract.
658 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver) {
659 check_is_loaded();
660 VM_ENTRY_MARK;
661
662 KlassHandle caller_klass (THREAD, caller->get_Klass());
663 KlassHandle h_recv (THREAD, exact_receiver->get_Klass());
664 KlassHandle h_resolved (THREAD, holder()->get_Klass());
665 Symbol* h_name = name()->get_symbol();
666 Symbol* h_signature = signature()->get_symbol();
667
668 methodHandle m;
669 // Only do exact lookup if receiver klass has been linked. Otherwise,
670 // the vtable has not been setup, and the LinkResolver will fail.
671 if (h_recv->oop_is_array()
672 ||
673 InstanceKlass::cast(h_recv())->is_linked() && !exact_receiver->is_interface()) {
674 if (holder()->is_interface()) {
675 m = LinkResolver::resolve_interface_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass);
676 } else {
677 m = LinkResolver::resolve_virtual_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass);
678 }
679 }
680
681 if (m.is_null()) {
682 // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
683 return NULL;
684 }
685
686 ciMethod* result = this;
687 if (m() != get_Method()) {
688 result = CURRENT_THREAD_ENV->get_method(m());
689 }
690
691 // Don't return abstract methods because they aren't
692 // optimizable or interesting.
693 if (result->is_abstract()) {
694 return NULL;
695 } else {
696 return result;
697 }
698 }
699
700 // ------------------------------------------------------------------
701 // ciMethod::resolve_vtable_index
702 //
703 // Given a known receiver klass, find the vtable index for the call.
704 // Return Method::invalid_vtable_index if the vtable_index is unknown.
705 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
706 check_is_loaded();
707
708 int vtable_index = Method::invalid_vtable_index;
709 // Only do lookup if receiver klass has been linked. Otherwise,
710 // the vtable has not been setup, and the LinkResolver will fail.
711 if (!receiver->is_interface()
712 && (!receiver->is_instance_klass() ||
713 receiver->as_instance_klass()->is_linked())) {
714 VM_ENTRY_MARK;
715
716 KlassHandle caller_klass (THREAD, caller->get_Klass());
717 KlassHandle h_recv (THREAD, receiver->get_Klass());
718 Symbol* h_name = name()->get_symbol();
719 Symbol* h_signature = signature()->get_symbol();
720
721 vtable_index = LinkResolver::resolve_virtual_vtable_index(h_recv, h_recv, h_name, h_signature, caller_klass);
722 if (vtable_index == Method::nonvirtual_vtable_index) {
723 // A statically bound method. Return "no such index".
724 vtable_index = Method::invalid_vtable_index;
725 }
726 }
727
728 return vtable_index;
729 }
730
731 // ------------------------------------------------------------------
732 // ciMethod::interpreter_call_site_count
733 int ciMethod::interpreter_call_site_count(int bci) {
734 if (method_data() != NULL) {
735 ResourceMark rm;
736 ciProfileData* data = method_data()->bci_to_data(bci);
737 if (data != NULL && data->is_CounterData()) {
738 return scale_count(data->as_CounterData()->count());
739 }
740 }
741 return -1; // unknown
742 }
743
744 // ------------------------------------------------------------------
745 // ciMethod::get_field_at_bci
746 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
747 ciBytecodeStream iter(this);
748 iter.reset_to_bci(bci);
749 iter.next();
750 return iter.get_field(will_link);
751 }
752
753 // ------------------------------------------------------------------
754 // ciMethod::get_method_at_bci
755 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
756 ciBytecodeStream iter(this);
757 iter.reset_to_bci(bci);
758 iter.next();
759 return iter.get_method(will_link, declared_signature);
760 }
761
762 // ------------------------------------------------------------------
763 // Adjust a CounterData count to be commensurate with
764 // interpreter_invocation_count. If the MDO exists for
765 // only 25% of the time the method exists, then the
766 // counts in the MDO should be scaled by 4X, so that
767 // they can be usefully and stably compared against the
768 // invocation counts in methods.
769 int ciMethod::scale_count(int count, float prof_factor) {
770 if (count > 0 && method_data() != NULL) {
771 int counter_life;
772 int method_life = interpreter_invocation_count();
773 if (TieredCompilation) {
774 // In tiered the MDO's life is measured directly, so just use the snapshotted counters
775 counter_life = MAX2(method_data()->invocation_count(), method_data()->backedge_count());
776 } else {
777 int current_mileage = method_data()->current_mileage();
778 int creation_mileage = method_data()->creation_mileage();
779 counter_life = current_mileage - creation_mileage;
780 }
781
782 // counter_life due to backedge_counter could be > method_life
783 if (counter_life > method_life)
784 counter_life = method_life;
785 if (0 < counter_life && counter_life <= method_life) {
786 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
787 count = (count > 0) ? count : 1;
788 }
789 }
790 return count;
791 }
792
793 // ------------------------------------------------------------------
794 // invokedynamic support
795
796 // ------------------------------------------------------------------
797 // ciMethod::is_method_handle_intrinsic
798 //
799 // Return true if the method is an instance of the JVM-generated
800 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
801 bool ciMethod::is_method_handle_intrinsic() const {
802 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
803 return (MethodHandles::is_signature_polymorphic(iid) &&
804 MethodHandles::is_signature_polymorphic_intrinsic(iid));
805 }
806
807 // ------------------------------------------------------------------
808 // ciMethod::is_compiled_lambda_form
809 //
810 // Return true if the method is a generated MethodHandle adapter.
811 // These are built by Java code.
812 bool ciMethod::is_compiled_lambda_form() const {
813 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
814 return iid == vmIntrinsics::_compiledLambdaForm;
815 }
816
817 // ------------------------------------------------------------------
818 // ciMethod::has_member_arg
819 //
820 // Return true if the method is a linker intrinsic like _linkToVirtual.
821 // These are built by the JVM.
822 bool ciMethod::has_member_arg() const {
823 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
824 return (MethodHandles::is_signature_polymorphic(iid) &&
825 MethodHandles::has_member_arg(iid));
826 }
827
828 // ------------------------------------------------------------------
829 // ciMethod::ensure_method_data
830 //
831 // Generate new MethodData* objects at compile time.
832 // Return true if allocation was successful or no MDO is required.
833 bool ciMethod::ensure_method_data(methodHandle h_m) {
834 EXCEPTION_CONTEXT;
835 if (is_native() || is_abstract() || h_m()->is_accessor()) return true;
836 if (h_m()->method_data() == NULL) {
837 Method::build_interpreter_method_data(h_m, THREAD);
838 if (HAS_PENDING_EXCEPTION) {
839 CLEAR_PENDING_EXCEPTION;
840 }
841 }
842 if (h_m()->method_data() != NULL) {
843 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
844 _method_data->load_data();
845 return true;
846 } else {
847 _method_data = CURRENT_ENV->get_empty_methodData();
848 return false;
849 }
850 }
851
852 // public, retroactive version
853 bool ciMethod::ensure_method_data() {
854 bool result = true;
855 if (_method_data == NULL || _method_data->is_empty()) {
856 GUARDED_VM_ENTRY({
857 result = ensure_method_data(get_Method());
858 });
859 }
860 return result;
861 }
862
863
864 // ------------------------------------------------------------------
865 // ciMethod::method_data
866 //
867 ciMethodData* ciMethod::method_data() {
868 if (_method_data != NULL) {
869 return _method_data;
870 }
871 VM_ENTRY_MARK;
872 ciEnv* env = CURRENT_ENV;
873 Thread* my_thread = JavaThread::current();
874 methodHandle h_m(my_thread, get_Method());
875
876 if (h_m()->method_data() != NULL) {
877 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
878 _method_data->load_data();
879 } else {
880 _method_data = CURRENT_ENV->get_empty_methodData();
881 }
882 return _method_data;
883
884 }
885
886 // ------------------------------------------------------------------
887 // ciMethod::method_data_or_null
888 // Returns a pointer to ciMethodData if MDO exists on the VM side,
889 // NULL otherwise.
890 ciMethodData* ciMethod::method_data_or_null() {
891 ciMethodData *md = method_data();
892 if (md->is_empty()) return NULL;
893 return md;
894 }
895
896 // ------------------------------------------------------------------
897 // ciMethod::should_exclude
898 //
899 // Should this method be excluded from compilation?
900 bool ciMethod::should_exclude() {
901 check_is_loaded();
902 VM_ENTRY_MARK;
903 methodHandle mh(THREAD, get_Method());
904 bool ignore;
905 return CompilerOracle::should_exclude(mh, ignore);
906 }
907
908 // ------------------------------------------------------------------
909 // ciMethod::should_inline
910 //
911 // Should this method be inlined during compilation?
912 bool ciMethod::should_inline() {
913 check_is_loaded();
914 VM_ENTRY_MARK;
915 methodHandle mh(THREAD, get_Method());
916 return CompilerOracle::should_inline(mh);
917 }
918
919 // ------------------------------------------------------------------
920 // ciMethod::should_not_inline
921 //
922 // Should this method be disallowed from inlining during compilation?
923 bool ciMethod::should_not_inline() {
924 check_is_loaded();
925 VM_ENTRY_MARK;
926 methodHandle mh(THREAD, get_Method());
927 return CompilerOracle::should_not_inline(mh);
928 }
929
930 // ------------------------------------------------------------------
931 // ciMethod::should_print_assembly
932 //
933 // Should the compiler print the generated code for this method?
934 bool ciMethod::should_print_assembly() {
935 check_is_loaded();
936 VM_ENTRY_MARK;
937 methodHandle mh(THREAD, get_Method());
938 return CompilerOracle::should_print(mh);
939 }
940
941 // ------------------------------------------------------------------
942 // ciMethod::break_at_execute
943 //
944 // Should the compiler insert a breakpoint into the generated code
945 // method?
946 bool ciMethod::break_at_execute() {
947 check_is_loaded();
948 VM_ENTRY_MARK;
949 methodHandle mh(THREAD, get_Method());
950 return CompilerOracle::should_break_at(mh);
951 }
952
953 // ------------------------------------------------------------------
954 // ciMethod::has_option
955 //
956 bool ciMethod::has_option(const char* option) {
957 check_is_loaded();
958 VM_ENTRY_MARK;
959 methodHandle mh(THREAD, get_Method());
960 return CompilerOracle::has_option_string(mh, option);
961 }
962
963 // ------------------------------------------------------------------
964 // ciMethod::can_be_compiled
965 //
966 // Have previous compilations of this method succeeded?
967 bool ciMethod::can_be_compiled() {
968 check_is_loaded();
969 ciEnv* env = CURRENT_ENV;
970 if (is_c1_compile(env->comp_level())) {
971 return _is_c1_compilable;
972 }
973 return _is_c2_compilable;
974 }
975
976 // ------------------------------------------------------------------
977 // ciMethod::set_not_compilable
978 //
979 // Tell the VM that this method cannot be compiled at all.
980 void ciMethod::set_not_compilable(const char* reason) {
981 check_is_loaded();
982 VM_ENTRY_MARK;
983 ciEnv* env = CURRENT_ENV;
984 if (is_c1_compile(env->comp_level())) {
985 _is_c1_compilable = false;
986 } else {
987 _is_c2_compilable = false;
988 }
989 get_Method()->set_not_compilable(env->comp_level(), true, reason);
990 }
991
992 // ------------------------------------------------------------------
993 // ciMethod::can_be_osr_compiled
994 //
995 // Have previous compilations of this method succeeded?
996 //
997 // Implementation note: the VM does not currently keep track
998 // of failed OSR compilations per bci. The entry_bci parameter
999 // is currently unused.
1000 bool ciMethod::can_be_osr_compiled(int entry_bci) {
1001 check_is_loaded();
1002 VM_ENTRY_MARK;
1003 ciEnv* env = CURRENT_ENV;
1004 return !get_Method()->is_not_osr_compilable(env->comp_level());
1005 }
1006
1007 // ------------------------------------------------------------------
1008 // ciMethod::has_compiled_code
1009 bool ciMethod::has_compiled_code() {
1010 return instructions_size() > 0;
1011 }
1012
1013 int ciMethod::comp_level() {
1014 check_is_loaded();
1015 VM_ENTRY_MARK;
1016 nmethod* nm = get_Method()->code();
1017 if (nm != NULL) return nm->comp_level();
1018 return 0;
1019 }
1020
1021 int ciMethod::highest_osr_comp_level() {
1022 check_is_loaded();
1023 VM_ENTRY_MARK;
1024 return get_Method()->highest_osr_comp_level();
1025 }
1026
1027 // ------------------------------------------------------------------
1028 // ciMethod::code_size_for_inlining
1029 //
1030 // Code size for inlining decisions. This method returns a code
1031 // size of 1 for methods which has the ForceInline annotation.
1032 int ciMethod::code_size_for_inlining() {
1033 check_is_loaded();
1034 if (get_Method()->force_inline()) {
1035 return 1;
1036 }
1037 return code_size();
1038 }
1039
1040 // ------------------------------------------------------------------
1041 // ciMethod::instructions_size
1042 //
1043 // This is a rough metric for "fat" methods, compared before inlining
1044 // with InlineSmallCode. The CodeBlob::code_size accessor includes
1045 // junk like exception handler, stubs, and constant table, which are
1046 // not highly relevant to an inlined method. So we use the more
1047 // specific accessor nmethod::insts_size.
1048 int ciMethod::instructions_size() {
1049 if (_instructions_size == -1) {
1050 GUARDED_VM_ENTRY(
1051 nmethod* code = get_Method()->code();
1052 if (code != NULL && (code->comp_level() == CompLevel_full_optimization)) {
1053 _instructions_size = code->insts_end() - code->verified_entry_point();
1054 } else {
1055 _instructions_size = 0;
1056 }
1057 );
1058 }
1059 return _instructions_size;
1060 }
1061
1062 // ------------------------------------------------------------------
1063 // ciMethod::log_nmethod_identity
1064 void ciMethod::log_nmethod_identity(xmlStream* log) {
1065 GUARDED_VM_ENTRY(
1066 nmethod* code = get_Method()->code();
1067 if (code != NULL) {
1068 code->log_identity(log);
1069 }
1070 )
1071 }
1072
1073 // ------------------------------------------------------------------
1074 // ciMethod::is_not_reached
1075 bool ciMethod::is_not_reached(int bci) {
1076 check_is_loaded();
1077 VM_ENTRY_MARK;
1078 return Interpreter::is_not_reached(
1079 methodHandle(THREAD, get_Method()), bci);
1080 }
1081
1082 // ------------------------------------------------------------------
1083 // ciMethod::was_never_executed
1084 bool ciMethod::was_executed_more_than(int times) {
1085 VM_ENTRY_MARK;
1086 return get_Method()->was_executed_more_than(times);
1087 }
1088
1089 // ------------------------------------------------------------------
1090 // ciMethod::has_unloaded_classes_in_signature
1091 bool ciMethod::has_unloaded_classes_in_signature() {
1092 VM_ENTRY_MARK;
1093 {
1094 EXCEPTION_MARK;
1095 methodHandle m(THREAD, get_Method());
1096 bool has_unloaded = Method::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);
1097 if( HAS_PENDING_EXCEPTION ) {
1098 CLEAR_PENDING_EXCEPTION;
1099 return true; // Declare that we may have unloaded classes
1100 }
1101 return has_unloaded;
1102 }
1103 }
1104
1105 // ------------------------------------------------------------------
1106 // ciMethod::is_klass_loaded
1107 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1108 VM_ENTRY_MARK;
1109 return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);
1110 }
1111
1112 // ------------------------------------------------------------------
1113 // ciMethod::check_call
1114 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1115 VM_ENTRY_MARK;
1116 {
1117 EXCEPTION_MARK;
1118 HandleMark hm(THREAD);
1119 constantPoolHandle pool (THREAD, get_Method()->constants());
1120 methodHandle spec_method;
1121 KlassHandle spec_klass;
1122 Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1123 LinkResolver::resolve_method_statically(spec_method, spec_klass, code, pool, refinfo_index, THREAD);
1124 if (HAS_PENDING_EXCEPTION) {
1125 CLEAR_PENDING_EXCEPTION;
1126 return false;
1127 } else {
1128 return (spec_method->is_static() == is_static);
1129 }
1130 }
1131 return false;
1132 }
1133
1134 // ------------------------------------------------------------------
1135 // ciMethod::print_codes
1136 //
1137 // Print the bytecodes for this method.
1138 void ciMethod::print_codes_on(outputStream* st) {
1139 check_is_loaded();
1140 GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1141 }
1142
1143
1144 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1145 check_is_loaded(); \
1146 VM_ENTRY_MARK; \
1147 return get_Method()->flag_accessor(); \
1148 }
1149
1150 bool ciMethod::is_empty_method() const { FETCH_FLAG_FROM_VM(is_empty_method); }
1151 bool ciMethod::is_vanilla_constructor() const { FETCH_FLAG_FROM_VM(is_vanilla_constructor); }
1152 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1153 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1154 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1155 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); }
1156
1157 BCEscapeAnalyzer *ciMethod::get_bcea() {
1158 #ifdef COMPILER2
1159 if (_bcea == NULL) {
1160 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1161 }
1162 return _bcea;
1163 #else // COMPILER2
1164 ShouldNotReachHere();
1165 return NULL;
1166 #endif // COMPILER2
1167 }
1168
1169 ciMethodBlocks *ciMethod::get_method_blocks() {
1170 Arena *arena = CURRENT_ENV->arena();
1171 if (_method_blocks == NULL) {
1172 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1173 }
1174 return _method_blocks;
1175 }
1176
1177 #undef FETCH_FLAG_FROM_VM
1178
1179 void ciMethod::dump_replay_data(outputStream* st) {
1180 ASSERT_IN_VM;
1181 ResourceMark rm;
1182 Method* method = get_Method();
1183 Klass* holder = method->method_holder();
1184 st->print_cr("ciMethod %s %s %s %d %d %d %d %d",
1185 holder->name()->as_quoted_ascii(),
1186 method->name()->as_quoted_ascii(),
1187 method->signature()->as_quoted_ascii(),
1188 method->invocation_counter()->raw_counter(),
1189 method->backedge_counter()->raw_counter(),
1190 interpreter_invocation_count(),
1191 interpreter_throwout_count(),
1192 _instructions_size);
1193 }
1194
1195 // ------------------------------------------------------------------
1196 // ciMethod::print_codes
1197 //
1198 // Print a range of the bytecodes for this method.
1199 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1200 check_is_loaded();
1201 GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1202 }
1203
1204 // ------------------------------------------------------------------
1205 // ciMethod::print_name
1206 //
1207 // Print the name of this method, including signature and some flags.
1208 void ciMethod::print_name(outputStream* st) {
1209 check_is_loaded();
1210 GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1211 }
1212
1213 // ------------------------------------------------------------------
1214 // ciMethod::print_short_name
1215 //
1216 // Print the name of this method, without signature.
1217 void ciMethod::print_short_name(outputStream* st) {
1218 if (is_loaded()) {
1219 GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1220 } else {
1221 // Fall back if method is not loaded.
1222 holder()->print_name_on(st);
1223 st->print("::");
1224 name()->print_symbol_on(st);
1225 if (WizardMode)
1226 signature()->as_symbol()->print_symbol_on(st);
1227 }
1228 }
1229
1230 // ------------------------------------------------------------------
1231 // ciMethod::print_impl
1232 //
1233 // Implementation of the print method.
1234 void ciMethod::print_impl(outputStream* st) {
1235 ciMetadata::print_impl(st);
1236 st->print(" name=");
1237 name()->print_symbol_on(st);
1238 st->print(" holder=");
1239 holder()->print_name_on(st);
1240 st->print(" signature=");
1241 signature()->as_symbol()->print_symbol_on(st);
1242 if (is_loaded()) {
1243 st->print(" loaded=true");
1244 st->print(" arg_size=%d", arg_size());
1245 st->print(" flags=");
1246 flags().print_member_flags(st);
1247 } else {
1248 st->print(" loaded=false");
1249 }
1250 }