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