1 /*
2 * Copyright (c) 1999, 2019, 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.inline.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "compiler/abstractCompiler.hpp"
38 #include "compiler/methodLiveness.hpp"
39 #include "interpreter/interpreter.hpp"
40 #include "interpreter/linkResolver.hpp"
41 #include "interpreter/oopMapCache.hpp"
42 #include "memory/allocation.inline.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "oops/generateOopMap.hpp"
45 #include "oops/method.inline.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "prims/nativeLookup.hpp"
48 #include "runtime/deoptimization.hpp"
49 #include "runtime/handles.inline.hpp"
50 #include "utilities/bitMap.inline.hpp"
51 #include "utilities/xmlstream.hpp"
52 #ifdef COMPILER2
53 #include "ci/bcEscapeAnalyzer.hpp"
54 #include "ci/ciTypeFlow.hpp"
55 #include "oops/method.hpp"
56 #endif
57
58 // ciMethod
59 //
60 // This class represents a Method* in the HotSpot virtual
61 // machine.
62
63
64 // ------------------------------------------------------------------
65 // ciMethod::ciMethod
66 //
67 // Loaded method.
68 ciMethod::ciMethod(const methodHandle& h_m, ciInstanceKlass* holder) :
69 ciMetadata(h_m()),
70 _holder(holder)
71 {
72 assert(h_m() != NULL, "no null method");
73
74 if (LogTouchedMethods) {
75 h_m()->log_touched(Thread::current());
76 }
77 // These fields are always filled in in loaded methods.
78 _flags = ciFlags(h_m()->access_flags());
79
80 // Easy to compute, so fill them in now.
81 _max_stack = h_m()->max_stack();
82 _max_locals = h_m()->max_locals();
83 _code_size = h_m()->code_size();
84 _intrinsic_id = h_m()->intrinsic_id();
85 _handler_count = h_m()->exception_table_length();
86 _size_of_parameters = h_m()->size_of_parameters();
87 _uses_monitors = h_m()->access_flags().has_monitor_bytecodes();
88 _balanced_monitors = !_uses_monitors || h_m()->access_flags().is_monitor_matching();
89 _is_c1_compilable = !h_m()->is_not_c1_compilable();
90 _is_c2_compilable = !h_m()->is_not_c2_compilable();
91 _can_be_parsed = true;
92 _has_reserved_stack_access = h_m()->has_reserved_stack_access();
93 _is_overpass = h_m()->is_overpass();
94 // Lazy fields, filled in on demand. Require allocation.
95 _code = NULL;
96 _exception_handlers = NULL;
97 _liveness = NULL;
98 _method_blocks = NULL;
99 #if defined(COMPILER2)
100 _flow = NULL;
101 _bcea = NULL;
102 #endif // COMPILER2
103
104 ciEnv *env = CURRENT_ENV;
105 if (env->jvmti_can_hotswap_or_post_breakpoint()) {
106 // 6328518 check hotswap conditions under the right lock.
107 MutexLocker locker(Compile_lock);
108 if (Dependencies::check_evol_method(h_m()) != NULL) {
109 _is_c1_compilable = false;
110 _is_c2_compilable = false;
111 _can_be_parsed = false;
112 }
113 } else {
114 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
115 }
116
117 if (h_m()->method_holder()->is_linked()) {
118 _can_be_statically_bound = h_m()->can_be_statically_bound();
119 } else {
120 // Have to use a conservative value in this case.
121 _can_be_statically_bound = false;
122 }
123
124 // Adjust the definition of this condition to be more useful:
125 // %%% take these conditions into account in vtable generation
126 if (!_can_be_statically_bound && h_m()->is_private())
127 _can_be_statically_bound = true;
128 if (_can_be_statically_bound && h_m()->is_abstract())
129 _can_be_statically_bound = false;
130
131 // generating _signature may allow GC and therefore move m.
132 // These fields are always filled in.
133 _name = env->get_symbol(h_m()->name());
134 ciSymbol* sig_symbol = env->get_symbol(h_m()->signature());
135 constantPoolHandle cpool = h_m()->constants();
136 _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
137 _method_data = NULL;
138 _nmethod_age = h_m()->nmethod_age();
139 // Take a snapshot of these values, so they will be commensurate with the MDO.
140 if (ProfileInterpreter || TieredCompilation) {
141 int invcnt = h_m()->interpreter_invocation_count();
142 // if the value overflowed report it as max int
143 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
144 _interpreter_throwout_count = h_m()->interpreter_throwout_count();
145 } else {
146 _interpreter_invocation_count = 0;
147 _interpreter_throwout_count = 0;
148 }
149 if (_interpreter_invocation_count == 0)
150 _interpreter_invocation_count = 1;
151 _instructions_size = -1;
152 #ifdef ASSERT
153 if (ReplayCompiles) {
154 ciReplay::initialize(this);
155 }
156 #endif
157 }
158
159
160 // ------------------------------------------------------------------
161 // ciMethod::ciMethod
162 //
163 // Unloaded method.
164 ciMethod::ciMethod(ciInstanceKlass* holder,
165 ciSymbol* name,
166 ciSymbol* signature,
167 ciInstanceKlass* accessor) :
168 ciMetadata((Metadata*)NULL),
169 _name( name),
170 _holder( holder),
171 _method_data( NULL),
172 _method_blocks( NULL),
173 _intrinsic_id( vmIntrinsics::_none),
174 _instructions_size(-1),
175 _can_be_statically_bound(false),
176 _liveness( NULL)
177 #if defined(COMPILER2)
178 ,
179 _flow( NULL),
180 _bcea( NULL)
181 #endif // COMPILER2
182 {
183 // Usually holder and accessor are the same type but in some cases
184 // the holder has the wrong class loader (e.g. invokedynamic call
185 // sites) so we pass the accessor.
186 _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
187 }
188
189
190 // ------------------------------------------------------------------
191 // ciMethod::load_code
192 //
193 // Load the bytecodes and exception handler table for this method.
194 void ciMethod::load_code() {
195 VM_ENTRY_MARK;
196 assert(is_loaded(), "only loaded methods have code");
197
198 Method* me = get_Method();
199 Arena* arena = CURRENT_THREAD_ENV->arena();
200
201 // Load the bytecodes.
202 _code = (address)arena->Amalloc(code_size());
203 memcpy(_code, me->code_base(), code_size());
204
205 #if INCLUDE_JVMTI
206 // Revert any breakpoint bytecodes in ci's copy
207 if (me->number_of_breakpoints() > 0) {
208 BreakpointInfo* bp = me->method_holder()->breakpoints();
209 for (; bp != NULL; bp = bp->next()) {
210 if (bp->match(me)) {
211 code_at_put(bp->bci(), bp->orig_bytecode());
212 }
213 }
214 }
215 #endif
216
217 // And load the exception table.
218 ExceptionTable exc_table(me);
219
220 // Allocate one extra spot in our list of exceptions. This
221 // last entry will be used to represent the possibility that
222 // an exception escapes the method. See ciExceptionHandlerStream
223 // for details.
224 _exception_handlers =
225 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
226 * (_handler_count + 1));
227 if (_handler_count > 0) {
228 for (int i=0; i<_handler_count; i++) {
229 _exception_handlers[i] = new (arena) ciExceptionHandler(
230 holder(),
231 /* start */ exc_table.start_pc(i),
232 /* limit */ exc_table.end_pc(i),
233 /* goto pc */ exc_table.handler_pc(i),
234 /* cp index */ exc_table.catch_type_index(i));
235 }
236 }
237
238 // Put an entry at the end of our list to represent the possibility
239 // of exceptional exit.
240 _exception_handlers[_handler_count] =
241 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
242
243 if (CIPrintMethodCodes) {
244 print_codes();
245 }
246 }
247
248
249 // ------------------------------------------------------------------
250 // ciMethod::has_linenumber_table
251 //
252 // length unknown until decompression
253 bool ciMethod::has_linenumber_table() const {
254 check_is_loaded();
255 VM_ENTRY_MARK;
256 return get_Method()->has_linenumber_table();
257 }
258
259
260 // ------------------------------------------------------------------
261 // ciMethod::compressed_linenumber_table
262 u_char* ciMethod::compressed_linenumber_table() const {
263 check_is_loaded();
264 VM_ENTRY_MARK;
265 return get_Method()->compressed_linenumber_table();
266 }
267
268
269 // ------------------------------------------------------------------
270 // ciMethod::line_number_from_bci
271 int ciMethod::line_number_from_bci(int bci) const {
272 check_is_loaded();
273 VM_ENTRY_MARK;
274 return get_Method()->line_number_from_bci(bci);
275 }
276
277
278 // ------------------------------------------------------------------
279 // ciMethod::vtable_index
280 //
281 // Get the position of this method's entry in the vtable, if any.
282 int ciMethod::vtable_index() {
283 check_is_loaded();
284 assert(holder()->is_linked(), "must be linked");
285 VM_ENTRY_MARK;
286 return get_Method()->vtable_index();
287 }
288
289
290 // ------------------------------------------------------------------
291 // ciMethod::native_entry
292 //
293 // Get the address of this method's native code, if any.
294 address ciMethod::native_entry() {
295 check_is_loaded();
296 assert(flags().is_native(), "must be native method");
297 VM_ENTRY_MARK;
298 Method* method = get_Method();
299 address entry = method->native_function();
300 assert(entry != NULL, "must be valid entry point");
301 return entry;
302 }
303
304
305 // ------------------------------------------------------------------
306 // ciMethod::interpreter_entry
307 //
308 // Get the entry point for running this method in the interpreter.
309 address ciMethod::interpreter_entry() {
310 check_is_loaded();
311 VM_ENTRY_MARK;
312 methodHandle mh(THREAD, get_Method());
313 return Interpreter::entry_for_method(mh);
314 }
315
316
317 // ------------------------------------------------------------------
318 // ciMethod::uses_balanced_monitors
319 //
320 // Does this method use monitors in a strict stack-disciplined manner?
321 bool ciMethod::has_balanced_monitors() {
322 check_is_loaded();
323 if (_balanced_monitors) return true;
324
325 // Analyze the method to see if monitors are used properly.
326 VM_ENTRY_MARK;
327 methodHandle method(THREAD, get_Method());
328 assert(method->has_monitor_bytecodes(), "should have checked this");
329
330 // Check to see if a previous compilation computed the
331 // monitor-matching analysis.
332 if (method->guaranteed_monitor_matching()) {
333 _balanced_monitors = true;
334 return true;
335 }
336
337 {
338 EXCEPTION_MARK;
339 ResourceMark rm(THREAD);
340 GeneratePairingInfo gpi(method);
341 gpi.compute_map(CATCH);
342 if (!gpi.monitor_safe()) {
343 return false;
344 }
345 method->set_guaranteed_monitor_matching();
346 _balanced_monitors = true;
347 }
348 return true;
349 }
350
351
352 // ------------------------------------------------------------------
353 // ciMethod::get_flow_analysis
354 ciTypeFlow* ciMethod::get_flow_analysis() {
355 #if defined(COMPILER2)
356 if (_flow == NULL) {
357 ciEnv* env = CURRENT_ENV;
358 _flow = new (env->arena()) ciTypeFlow(env, this);
359 _flow->do_flow();
360 }
361 return _flow;
362 #else // COMPILER2
363 ShouldNotReachHere();
364 return NULL;
365 #endif // COMPILER2
366 }
367
368
369 // ------------------------------------------------------------------
370 // ciMethod::get_osr_flow_analysis
371 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
372 #if defined(COMPILER2)
373 // OSR entry points are always place after a call bytecode of some sort
374 assert(osr_bci >= 0, "must supply valid OSR entry point");
375 ciEnv* env = CURRENT_ENV;
376 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
377 flow->do_flow();
378 return flow;
379 #else // COMPILER2
380 ShouldNotReachHere();
381 return NULL;
382 #endif // COMPILER2
383 }
384
385 // ------------------------------------------------------------------
386 // ciMethod::raw_liveness_at_bci
387 //
388 // Which local variables are live at a specific bci?
389 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
390 check_is_loaded();
391 if (_liveness == NULL) {
392 // Create the liveness analyzer.
393 Arena* arena = CURRENT_ENV->arena();
394 _liveness = new (arena) MethodLiveness(arena, this);
395 _liveness->compute_liveness();
396 }
397 return _liveness->get_liveness_at(bci);
398 }
399
400 // ------------------------------------------------------------------
401 // ciMethod::liveness_at_bci
402 //
403 // Which local variables are live at a specific bci? When debugging
404 // will return true for all locals in some cases to improve debug
405 // information.
406 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
407 if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot) {
408 // Keep all locals live for the user's edification and amusement.
409 MethodLivenessResult result(_max_locals);
410 result.set_range(0, _max_locals);
411 result.set_is_valid();
412 return result;
413 }
414 return raw_liveness_at_bci(bci);
415 }
416
417 // ciMethod::live_local_oops_at_bci
418 //
419 // find all the live oops in the locals array for a particular bci
420 // Compute what the interpreter believes by using the interpreter
421 // oopmap generator. This is used as a double check during osr to
422 // guard against conservative result from MethodLiveness making us
423 // think a dead oop is live. MethodLiveness is conservative in the
424 // sense that it may consider locals to be live which cannot be live,
425 // like in the case where a local could contain an oop or a primitive
426 // along different paths. In that case the local must be dead when
427 // those paths merge. Since the interpreter's viewpoint is used when
428 // gc'ing an interpreter frame we need to use its viewpoint during
429 // OSR when loading the locals.
430
431 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
432 VM_ENTRY_MARK;
433 InterpreterOopMap mask;
434 OopMapCache::compute_one_oop_map(get_Method(), bci, &mask);
435 int mask_size = max_locals();
436 ResourceBitMap result(mask_size);
437 int i;
438 for (i = 0; i < mask_size ; i++ ) {
439 if (mask.is_oop(i)) result.set_bit(i);
440 }
441 return result;
442 }
443
444
445 #ifdef COMPILER1
446 // ------------------------------------------------------------------
447 // ciMethod::bci_block_start
448 //
449 // Marks all bcis where a new basic block starts
450 const BitMap& ciMethod::bci_block_start() {
451 check_is_loaded();
452 if (_liveness == NULL) {
453 // Create the liveness analyzer.
454 Arena* arena = CURRENT_ENV->arena();
455 _liveness = new (arena) MethodLiveness(arena, this);
456 _liveness->compute_liveness();
457 }
458
459 return _liveness->get_bci_block_start();
460 }
461 #endif // COMPILER1
462
463
464 // ------------------------------------------------------------------
465 // ciMethod::call_profile_at_bci
466 //
467 // Get the ciCallProfile for the invocation of this method.
468 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
469 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
470 ResourceMark rm;
471 ciCallProfile result;
472 if (method_data() != NULL && method_data()->is_mature()) {
473 ciProfileData* data = method_data()->bci_to_data(bci);
474 if (data != NULL && data->is_CounterData()) {
475 // Every profiled call site has a counter.
476 int count = data->as_CounterData()->count();
477
478 if (!data->is_ReceiverTypeData()) {
479 result._receiver_count[0] = 0; // that's a definite zero
480 } else { // ReceiverTypeData is a subclass of CounterData
481 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
482 // In addition, virtual call sites have receiver type information
483 int receivers_count_total = 0;
484 int morphism = 0;
485 // Precompute morphism for the possible fixup
486 for (uint i = 0; i < call->row_limit(); i++) {
487 ciKlass* receiver = call->receiver(i);
488 if (receiver == NULL) continue;
489 morphism++;
490 }
491 int epsilon = 0;
492 if (TieredCompilation) {
493 // For a call, it is assumed that either the type of the receiver(s)
494 // is recorded or an associated counter is incremented, but not both. With
495 // tiered compilation, however, both can happen due to the interpreter and
496 // C1 profiling invocations differently. Address that inconsistency here.
497 if (morphism == 1 && count > 0) {
498 epsilon = count;
499 count = 0;
500 }
501 }
502 for (uint i = 0; i < call->row_limit(); i++) {
503 ciKlass* receiver = call->receiver(i);
504 if (receiver == NULL) continue;
505 int rcount = call->receiver_count(i) + epsilon;
506 if (rcount == 0) rcount = 1; // Should be valid value
507 receivers_count_total += rcount;
508 // Add the receiver to result data.
509 result.add_receiver(receiver, rcount);
510 // If we extend profiling to record methods,
511 // we will set result._method also.
512 }
513 // Determine call site's morphism.
514 // The call site count is 0 with known morphism (only 1 or 2 receivers)
515 // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
516 // The call site count is > 0 in the case of a polymorphic virtual call.
517 if (morphism > 0 && morphism == result._limit) {
518 // The morphism <= MorphismLimit.
519 if ((morphism < ciCallProfile::MorphismLimit) ||
520 (morphism == ciCallProfile::MorphismLimit && count == 0)) {
521 #ifdef ASSERT
522 if (count > 0) {
523 this->print_short_name(tty);
524 tty->print_cr(" @ bci:%d", bci);
525 this->print_codes();
526 assert(false, "this call site should not be polymorphic");
527 }
528 #endif
529 result._morphism = morphism;
530 }
531 }
532 // Make the count consistent if this is a call profile. If count is
533 // zero or less, presume that this is a typecheck profile and
534 // do nothing. Otherwise, increase count to be the sum of all
535 // receiver's counts.
536 if (count >= 0) {
537 count += receivers_count_total;
538 }
539 }
540 result._count = count;
541 }
542 }
543 return result;
544 }
545
546 // ------------------------------------------------------------------
547 // Add new receiver and sort data by receiver's profile count.
548 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
549 // Add new receiver and sort data by receiver's counts when we have space
550 // for it otherwise replace the less called receiver (less called receiver
551 // is placed to the last array element which is not used).
552 // First array's element contains most called receiver.
553 int i = _limit;
554 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
555 _receiver[i] = _receiver[i-1];
556 _receiver_count[i] = _receiver_count[i-1];
557 }
558 _receiver[i] = receiver;
559 _receiver_count[i] = receiver_count;
560 if (_limit < MorphismLimit) _limit++;
561 }
562
563
564 void ciMethod::assert_virtual_call_type_ok(int bci) {
565 assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
566 java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
567 }
568
569 void ciMethod::assert_call_type_ok(int bci) {
570 assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
571 java_code_at_bci(bci) == Bytecodes::_invokespecial ||
572 java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
573 }
574
575 /**
576 * Check whether profiling provides a type for the argument i to the
577 * call at bci bci
578 *
579 * @param [in]bci bci of the call
580 * @param [in]i argument number
581 * @param [out]type profiled type of argument, NULL if none
582 * @param [out]ptr_kind whether always null, never null or maybe null
583 * @return true if profiling exists
584 *
585 */
586 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
587 if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
588 ciProfileData* data = method_data()->bci_to_data(bci);
589 if (data != NULL) {
590 if (data->is_VirtualCallTypeData()) {
591 assert_virtual_call_type_ok(bci);
592 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
593 if (i >= call->number_of_arguments()) {
594 return false;
595 }
596 type = call->valid_argument_type(i);
597 ptr_kind = call->argument_ptr_kind(i);
598 return true;
599 } else if (data->is_CallTypeData()) {
600 assert_call_type_ok(bci);
601 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
602 if (i >= call->number_of_arguments()) {
603 return false;
604 }
605 type = call->valid_argument_type(i);
606 ptr_kind = call->argument_ptr_kind(i);
607 return true;
608 }
609 }
610 }
611 return false;
612 }
613
614 /**
615 * Check whether profiling provides a type for the return value from
616 * the call at bci bci
617 *
618 * @param [in]bci bci of the call
619 * @param [out]type profiled type of argument, NULL if none
620 * @param [out]ptr_kind whether always null, never null or maybe null
621 * @return true if profiling exists
622 *
623 */
624 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
625 if (MethodData::profile_return() && method_data() != NULL && method_data()->is_mature()) {
626 ciProfileData* data = method_data()->bci_to_data(bci);
627 if (data != NULL) {
628 if (data->is_VirtualCallTypeData()) {
629 assert_virtual_call_type_ok(bci);
630 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
631 if (call->has_return()) {
632 type = call->valid_return_type();
633 ptr_kind = call->return_ptr_kind();
634 return true;
635 }
636 } else if (data->is_CallTypeData()) {
637 assert_call_type_ok(bci);
638 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
639 if (call->has_return()) {
640 type = call->valid_return_type();
641 ptr_kind = call->return_ptr_kind();
642 }
643 return true;
644 }
645 }
646 }
647 return false;
648 }
649
650 /**
651 * Check whether profiling provides a type for the parameter i
652 *
653 * @param [in]i parameter number
654 * @param [out]type profiled type of parameter, NULL if none
655 * @param [out]ptr_kind whether always null, never null or maybe null
656 * @return true if profiling exists
657 *
658 */
659 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
660 if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
661 ciParametersTypeData* parameters = method_data()->parameters_type_data();
662 if (parameters != NULL && i < parameters->number_of_parameters()) {
663 type = parameters->valid_parameter_type(i);
664 ptr_kind = parameters->parameter_ptr_kind(i);
665 return true;
666 }
667 }
668 return false;
669 }
670
671
672 // ------------------------------------------------------------------
673 // ciMethod::find_monomorphic_target
674 //
675 // Given a certain calling environment, find the monomorphic target
676 // for the call. Return NULL if the call is not monomorphic in
677 // its calling environment, or if there are only abstract methods.
678 // The returned method is never abstract.
679 // Note: If caller uses a non-null result, it must inform dependencies
680 // via assert_unique_concrete_method or assert_leaf_type.
681 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
682 ciInstanceKlass* callee_holder,
683 ciInstanceKlass* actual_recv,
684 bool check_access) {
685 check_is_loaded();
686
687 if (actual_recv->is_interface()) {
688 // %%% We cannot trust interface types, yet. See bug 6312651.
689 return NULL;
690 }
691
692 ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access);
693 if (root_m == NULL) {
694 // Something went wrong looking up the actual receiver method.
695 return NULL;
696 }
697 assert(!root_m->is_abstract(), "resolve_invoke promise");
698
699 // Make certain quick checks even if UseCHA is false.
700
701 // Is it private or final?
702 if (root_m->can_be_statically_bound()) {
703 return root_m;
704 }
705
706 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
707 // Easy case. There is no other place to put a method, so don't bother
708 // to go through the VM_ENTRY_MARK and all the rest.
709 return root_m;
710 }
711
712 // Array methods (clone, hashCode, etc.) are always statically bound.
713 // If we were to see an array type here, we'd return root_m.
714 // However, this method processes only ciInstanceKlasses. (See 4962591.)
715 // The inline_native_clone intrinsic narrows Object to T[] properly,
716 // so there is no need to do the same job here.
717
718 if (!UseCHA) return NULL;
719
720 VM_ENTRY_MARK;
721
722 // Disable CHA for default methods for now
723 if (root_m->is_default_method()) {
724 return NULL;
725 }
726
727 methodHandle target;
728 {
729 MutexLocker locker(Compile_lock);
730 Klass* context = actual_recv->get_Klass();
731 target = Dependencies::find_unique_concrete_method(context,
732 root_m->get_Method());
733 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
734 }
735
736 #ifndef PRODUCT
737 if (TraceDependencies && target() != NULL && target() != root_m->get_Method()) {
738 tty->print("found a non-root unique target method");
739 tty->print_cr(" context = %s", actual_recv->get_Klass()->external_name());
740 tty->print(" method = ");
741 target->print_short_name(tty);
742 tty->cr();
743 }
744 #endif //PRODUCT
745
746 if (target() == NULL) {
747 return NULL;
748 }
749 if (target() == root_m->get_Method()) {
750 return root_m;
751 }
752 if (!root_m->is_public() &&
753 !root_m->is_protected()) {
754 // If we are going to reason about inheritance, it's easiest
755 // if the method in question is public, protected, or private.
756 // If the answer is not root_m, it is conservatively correct
757 // to return NULL, even if the CHA encountered irrelevant
758 // methods in other packages.
759 // %%% TO DO: Work out logic for package-private methods
760 // with the same name but different vtable indexes.
761 return NULL;
762 }
763 assert(!target()->is_abstract(), "not allowed");
764 return CURRENT_THREAD_ENV->get_method(target());
765 }
766
767 // ------------------------------------------------------------------
768 // ciMethod::can_be_statically_bound
769 //
770 // Tries to determine whether a method can be statically bound in some context.
771 bool ciMethod::can_be_statically_bound(ciInstanceKlass* context) const {
772 return (holder() == context) && can_be_statically_bound();
773 }
774
775 // ------------------------------------------------------------------
776 // ciMethod::resolve_invoke
777 //
778 // Given a known receiver klass, find the target for the call.
779 // Return NULL if the call has no target or the target is abstract.
780 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access) {
781 check_is_loaded();
782 VM_ENTRY_MARK;
783
784 Klass* caller_klass = caller->get_Klass();
785 Klass* recv = exact_receiver->get_Klass();
786 Klass* resolved = holder()->get_Klass();
787 Symbol* h_name = name()->get_symbol();
788 Symbol* h_signature = signature()->get_symbol();
789
790 LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
791 check_access ? LinkInfo::needs_access_check : LinkInfo::skip_access_check);
792 methodHandle m;
793 // Only do exact lookup if receiver klass has been linked. Otherwise,
794 // the vtable has not been setup, and the LinkResolver will fail.
795 if (recv->is_array_klass()
796 ||
797 (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
798 if (holder()->is_interface()) {
799 m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
800 } else {
801 m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
802 }
803 }
804
805 if (m.is_null()) {
806 // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
807 return NULL;
808 }
809
810 ciMethod* result = this;
811 if (m() != get_Method()) {
812 result = CURRENT_THREAD_ENV->get_method(m());
813 }
814
815 // Don't return abstract methods because they aren't
816 // optimizable or interesting.
817 if (result->is_abstract()) {
818 return NULL;
819 } else {
820 return result;
821 }
822 }
823
824 // ------------------------------------------------------------------
825 // ciMethod::resolve_vtable_index
826 //
827 // Given a known receiver klass, find the vtable index for the call.
828 // Return Method::invalid_vtable_index if the vtable_index is unknown.
829 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
830 check_is_loaded();
831
832 int vtable_index = Method::invalid_vtable_index;
833 // Only do lookup if receiver klass has been linked. Otherwise,
834 // the vtable has not been setup, and the LinkResolver will fail.
835 if (!receiver->is_interface()
836 && (!receiver->is_instance_klass() ||
837 receiver->as_instance_klass()->is_linked())) {
838 VM_ENTRY_MARK;
839
840 Klass* caller_klass = caller->get_Klass();
841 Klass* recv = receiver->get_Klass();
842 Symbol* h_name = name()->get_symbol();
843 Symbol* h_signature = signature()->get_symbol();
844
845 LinkInfo link_info(recv, h_name, h_signature, caller_klass);
846 vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
847 if (vtable_index == Method::nonvirtual_vtable_index) {
848 // A statically bound method. Return "no such index".
849 vtable_index = Method::invalid_vtable_index;
850 }
851 }
852
853 return vtable_index;
854 }
855
856 // ------------------------------------------------------------------
857 // ciMethod::interpreter_call_site_count
858 int ciMethod::interpreter_call_site_count(int bci) {
859 if (method_data() != NULL) {
860 ResourceMark rm;
861 ciProfileData* data = method_data()->bci_to_data(bci);
862 if (data != NULL && data->is_CounterData()) {
863 return scale_count(data->as_CounterData()->count());
864 }
865 }
866 return -1; // unknown
867 }
868
869 // ------------------------------------------------------------------
870 // ciMethod::get_field_at_bci
871 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
872 ciBytecodeStream iter(this);
873 iter.reset_to_bci(bci);
874 iter.next();
875 return iter.get_field(will_link);
876 }
877
878 // ------------------------------------------------------------------
879 // ciMethod::get_method_at_bci
880 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
881 ciBytecodeStream iter(this);
882 iter.reset_to_bci(bci);
883 iter.next();
884 return iter.get_method(will_link, declared_signature);
885 }
886
887 // ------------------------------------------------------------------
888 ciKlass* ciMethod::get_declared_method_holder_at_bci(int bci) {
889 ciBytecodeStream iter(this);
890 iter.reset_to_bci(bci);
891 iter.next();
892 return iter.get_declared_method_holder();
893 }
894
895 // ------------------------------------------------------------------
896 // Adjust a CounterData count to be commensurate with
897 // interpreter_invocation_count. If the MDO exists for
898 // only 25% of the time the method exists, then the
899 // counts in the MDO should be scaled by 4X, so that
900 // they can be usefully and stably compared against the
901 // invocation counts in methods.
902 int ciMethod::scale_count(int count, float prof_factor) {
903 if (count > 0 && method_data() != NULL) {
904 int counter_life;
905 int method_life = interpreter_invocation_count();
906 if (TieredCompilation) {
907 // In tiered the MDO's life is measured directly, so just use the snapshotted counters
908 counter_life = MAX2(method_data()->invocation_count(), method_data()->backedge_count());
909 } else {
910 int current_mileage = method_data()->current_mileage();
911 int creation_mileage = method_data()->creation_mileage();
912 counter_life = current_mileage - creation_mileage;
913 }
914
915 // counter_life due to backedge_counter could be > method_life
916 if (counter_life > method_life)
917 counter_life = method_life;
918 if (0 < counter_life && counter_life <= method_life) {
919 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
920 count = (count > 0) ? count : 1;
921 }
922 }
923 return count;
924 }
925
926
927 // ------------------------------------------------------------------
928 // ciMethod::is_special_get_caller_class_method
929 //
930 bool ciMethod::is_ignored_by_security_stack_walk() const {
931 check_is_loaded();
932 VM_ENTRY_MARK;
933 return get_Method()->is_ignored_by_security_stack_walk();
934 }
935
936
937 // ------------------------------------------------------------------
938 // invokedynamic support
939
940 // ------------------------------------------------------------------
941 // ciMethod::is_method_handle_intrinsic
942 //
943 // Return true if the method is an instance of the JVM-generated
944 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
945 bool ciMethod::is_method_handle_intrinsic() const {
946 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
947 return (MethodHandles::is_signature_polymorphic(iid) &&
948 MethodHandles::is_signature_polymorphic_intrinsic(iid));
949 }
950
951 // ------------------------------------------------------------------
952 // ciMethod::is_compiled_lambda_form
953 //
954 // Return true if the method is a generated MethodHandle adapter.
955 // These are built by Java code.
956 bool ciMethod::is_compiled_lambda_form() const {
957 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
958 return iid == vmIntrinsics::_compiledLambdaForm;
959 }
960
961 // ------------------------------------------------------------------
962 // ciMethod::is_object_initializer
963 //
964 bool ciMethod::is_object_initializer() const {
965 return name() == ciSymbol::object_initializer_name();
966 }
967
968 // ------------------------------------------------------------------
969 // ciMethod::has_member_arg
970 //
971 // Return true if the method is a linker intrinsic like _linkToVirtual.
972 // These are built by the JVM.
973 bool ciMethod::has_member_arg() const {
974 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
975 return (MethodHandles::is_signature_polymorphic(iid) &&
976 MethodHandles::has_member_arg(iid));
977 }
978
979 // ------------------------------------------------------------------
980 // ciMethod::ensure_method_data
981 //
982 // Generate new MethodData* objects at compile time.
983 // Return true if allocation was successful or no MDO is required.
984 bool ciMethod::ensure_method_data(const methodHandle& h_m) {
985 EXCEPTION_CONTEXT;
986 if (is_native() || is_abstract() || h_m()->is_accessor()) {
987 return true;
988 }
989 if (h_m()->method_data() == NULL) {
990 Method::build_interpreter_method_data(h_m, THREAD);
991 if (HAS_PENDING_EXCEPTION) {
992 CLEAR_PENDING_EXCEPTION;
993 }
994 }
995 if (h_m()->method_data() != NULL) {
996 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
997 _method_data->load_data();
998 return true;
999 } else {
1000 _method_data = CURRENT_ENV->get_empty_methodData();
1001 return false;
1002 }
1003 }
1004
1005 // public, retroactive version
1006 bool ciMethod::ensure_method_data() {
1007 bool result = true;
1008 if (_method_data == NULL || _method_data->is_empty()) {
1009 GUARDED_VM_ENTRY({
1010 result = ensure_method_data(get_Method());
1011 });
1012 }
1013 return result;
1014 }
1015
1016
1017 // ------------------------------------------------------------------
1018 // ciMethod::method_data
1019 //
1020 ciMethodData* ciMethod::method_data() {
1021 if (_method_data != NULL) {
1022 return _method_data;
1023 }
1024 VM_ENTRY_MARK;
1025 ciEnv* env = CURRENT_ENV;
1026 Thread* my_thread = JavaThread::current();
1027 methodHandle h_m(my_thread, get_Method());
1028
1029 if (h_m()->method_data() != NULL) {
1030 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1031 _method_data->load_data();
1032 } else {
1033 _method_data = CURRENT_ENV->get_empty_methodData();
1034 }
1035 return _method_data;
1036
1037 }
1038
1039 // ------------------------------------------------------------------
1040 // ciMethod::method_data_or_null
1041 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1042 // NULL otherwise.
1043 ciMethodData* ciMethod::method_data_or_null() {
1044 ciMethodData *md = method_data();
1045 if (md->is_empty()) {
1046 return NULL;
1047 }
1048 return md;
1049 }
1050
1051 // ------------------------------------------------------------------
1052 // ciMethod::ensure_method_counters
1053 //
1054 MethodCounters* ciMethod::ensure_method_counters() {
1055 check_is_loaded();
1056 VM_ENTRY_MARK;
1057 methodHandle mh(THREAD, get_Method());
1058 MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1059 return method_counters;
1060 }
1061
1062 // ------------------------------------------------------------------
1063 // ciMethod::has_option
1064 //
1065 bool ciMethod::has_option(const char* option) {
1066 check_is_loaded();
1067 VM_ENTRY_MARK;
1068 methodHandle mh(THREAD, get_Method());
1069 return CompilerOracle::has_option_string(mh, option);
1070 }
1071
1072 // ------------------------------------------------------------------
1073 // ciMethod::has_option_value
1074 //
1075 bool ciMethod::has_option_value(const char* option, double& value) {
1076 check_is_loaded();
1077 VM_ENTRY_MARK;
1078 methodHandle mh(THREAD, get_Method());
1079 return CompilerOracle::has_option_value(mh, option, value);
1080 }
1081 // ------------------------------------------------------------------
1082 // ciMethod::can_be_compiled
1083 //
1084 // Have previous compilations of this method succeeded?
1085 bool ciMethod::can_be_compiled() {
1086 check_is_loaded();
1087 ciEnv* env = CURRENT_ENV;
1088 if (is_c1_compile(env->comp_level())) {
1089 return _is_c1_compilable;
1090 }
1091 return _is_c2_compilable;
1092 }
1093
1094 // ------------------------------------------------------------------
1095 // ciMethod::set_not_compilable
1096 //
1097 // Tell the VM that this method cannot be compiled at all.
1098 void ciMethod::set_not_compilable(const char* reason) {
1099 check_is_loaded();
1100 VM_ENTRY_MARK;
1101 ciEnv* env = CURRENT_ENV;
1102 if (is_c1_compile(env->comp_level())) {
1103 _is_c1_compilable = false;
1104 } else {
1105 _is_c2_compilable = false;
1106 }
1107 get_Method()->set_not_compilable(reason, env->comp_level());
1108 }
1109
1110 // ------------------------------------------------------------------
1111 // ciMethod::can_be_osr_compiled
1112 //
1113 // Have previous compilations of this method succeeded?
1114 //
1115 // Implementation note: the VM does not currently keep track
1116 // of failed OSR compilations per bci. The entry_bci parameter
1117 // is currently unused.
1118 bool ciMethod::can_be_osr_compiled(int entry_bci) {
1119 check_is_loaded();
1120 VM_ENTRY_MARK;
1121 ciEnv* env = CURRENT_ENV;
1122 return !get_Method()->is_not_osr_compilable(env->comp_level());
1123 }
1124
1125 // ------------------------------------------------------------------
1126 // ciMethod::has_compiled_code
1127 bool ciMethod::has_compiled_code() {
1128 return instructions_size() > 0;
1129 }
1130
1131 int ciMethod::comp_level() {
1132 check_is_loaded();
1133 VM_ENTRY_MARK;
1134 CompiledMethod* nm = get_Method()->code();
1135 if (nm != NULL) return nm->comp_level();
1136 return 0;
1137 }
1138
1139 int ciMethod::highest_osr_comp_level() {
1140 check_is_loaded();
1141 VM_ENTRY_MARK;
1142 return get_Method()->highest_osr_comp_level();
1143 }
1144
1145 // ------------------------------------------------------------------
1146 // ciMethod::code_size_for_inlining
1147 //
1148 // Code size for inlining decisions. This method returns a code
1149 // size of 1 for methods which has the ForceInline annotation.
1150 int ciMethod::code_size_for_inlining() {
1151 check_is_loaded();
1152 if (get_Method()->force_inline()) {
1153 return 1;
1154 }
1155 return code_size();
1156 }
1157
1158 // ------------------------------------------------------------------
1159 // ciMethod::instructions_size
1160 //
1161 // This is a rough metric for "fat" methods, compared before inlining
1162 // with InlineSmallCode. The CodeBlob::code_size accessor includes
1163 // junk like exception handler, stubs, and constant table, which are
1164 // not highly relevant to an inlined method. So we use the more
1165 // specific accessor nmethod::insts_size.
1166 int ciMethod::instructions_size() {
1167 if (_instructions_size == -1) {
1168 GUARDED_VM_ENTRY(
1169 CompiledMethod* code = get_Method()->code();
1170 if (code != NULL && (code->comp_level() == CompLevel_full_optimization)) {
1171 _instructions_size = code->insts_end() - code->verified_entry_point();
1172 } else {
1173 _instructions_size = 0;
1174 }
1175 );
1176 }
1177 return _instructions_size;
1178 }
1179
1180 // ------------------------------------------------------------------
1181 // ciMethod::log_nmethod_identity
1182 void ciMethod::log_nmethod_identity(xmlStream* log) {
1183 GUARDED_VM_ENTRY(
1184 CompiledMethod* code = get_Method()->code();
1185 if (code != NULL) {
1186 code->log_identity(log);
1187 }
1188 )
1189 }
1190
1191 // ------------------------------------------------------------------
1192 // ciMethod::is_not_reached
1193 bool ciMethod::is_not_reached(int bci) {
1194 check_is_loaded();
1195 VM_ENTRY_MARK;
1196 return Interpreter::is_not_reached(
1197 methodHandle(THREAD, get_Method()), bci);
1198 }
1199
1200 // ------------------------------------------------------------------
1201 // ciMethod::was_never_executed
1202 bool ciMethod::was_executed_more_than(int times) {
1203 VM_ENTRY_MARK;
1204 return get_Method()->was_executed_more_than(times);
1205 }
1206
1207 // ------------------------------------------------------------------
1208 // ciMethod::has_unloaded_classes_in_signature
1209 bool ciMethod::has_unloaded_classes_in_signature() {
1210 VM_ENTRY_MARK;
1211 {
1212 EXCEPTION_MARK;
1213 methodHandle m(THREAD, get_Method());
1214 bool has_unloaded = Method::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);
1215 if( HAS_PENDING_EXCEPTION ) {
1216 CLEAR_PENDING_EXCEPTION;
1217 return true; // Declare that we may have unloaded classes
1218 }
1219 return has_unloaded;
1220 }
1221 }
1222
1223 // ------------------------------------------------------------------
1224 // ciMethod::is_klass_loaded
1225 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1226 VM_ENTRY_MARK;
1227 return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);
1228 }
1229
1230 // ------------------------------------------------------------------
1231 // ciMethod::check_call
1232 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1233 // This method is used only in C2 from InlineTree::ok_to_inline,
1234 // and is only used under -Xcomp.
1235 // It appears to fail when applied to an invokeinterface call site.
1236 // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1237 VM_ENTRY_MARK;
1238 {
1239 EXCEPTION_MARK;
1240 HandleMark hm(THREAD);
1241 constantPoolHandle pool (THREAD, get_Method()->constants());
1242 Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1243 methodHandle spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1244 if (HAS_PENDING_EXCEPTION) {
1245 CLEAR_PENDING_EXCEPTION;
1246 return false;
1247 } else {
1248 return (spec_method->is_static() == is_static);
1249 }
1250 }
1251 return false;
1252 }
1253
1254 // ------------------------------------------------------------------
1255 // ciMethod::profile_aging
1256 //
1257 // Should the method be compiled with an age counter?
1258 bool ciMethod::profile_aging() const {
1259 return UseCodeAging && (!MethodCounters::is_nmethod_hot(nmethod_age()) &&
1260 !MethodCounters::is_nmethod_age_unset(nmethod_age()));
1261 }
1262 // ------------------------------------------------------------------
1263 // ciMethod::print_codes
1264 //
1265 // Print the bytecodes for this method.
1266 void ciMethod::print_codes_on(outputStream* st) {
1267 check_is_loaded();
1268 GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1269 }
1270
1271
1272 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1273 check_is_loaded(); \
1274 VM_ENTRY_MARK; \
1275 return get_Method()->flag_accessor(); \
1276 }
1277
1278 bool ciMethod::is_empty_method() const { FETCH_FLAG_FROM_VM(is_empty_method); }
1279 bool ciMethod::is_vanilla_constructor() const { FETCH_FLAG_FROM_VM(is_vanilla_constructor); }
1280 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1281 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1282 bool ciMethod::is_getter () const { FETCH_FLAG_FROM_VM(is_getter); }
1283 bool ciMethod::is_setter () const { FETCH_FLAG_FROM_VM(is_setter); }
1284 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1285 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); }
1286
1287 bool ciMethod::is_boxing_method() const {
1288 if (holder()->is_box_klass()) {
1289 switch (intrinsic_id()) {
1290 case vmIntrinsics::_Boolean_valueOf:
1291 case vmIntrinsics::_Byte_valueOf:
1292 case vmIntrinsics::_Character_valueOf:
1293 case vmIntrinsics::_Short_valueOf:
1294 case vmIntrinsics::_Integer_valueOf:
1295 case vmIntrinsics::_Long_valueOf:
1296 case vmIntrinsics::_Float_valueOf:
1297 case vmIntrinsics::_Double_valueOf:
1298 return true;
1299 default:
1300 return false;
1301 }
1302 }
1303 return false;
1304 }
1305
1306 bool ciMethod::is_unboxing_method() const {
1307 if (holder()->is_box_klass()) {
1308 switch (intrinsic_id()) {
1309 case vmIntrinsics::_booleanValue:
1310 case vmIntrinsics::_byteValue:
1311 case vmIntrinsics::_charValue:
1312 case vmIntrinsics::_shortValue:
1313 case vmIntrinsics::_intValue:
1314 case vmIntrinsics::_longValue:
1315 case vmIntrinsics::_floatValue:
1316 case vmIntrinsics::_doubleValue:
1317 return true;
1318 default:
1319 return false;
1320 }
1321 }
1322 return false;
1323 }
1324
1325 BCEscapeAnalyzer *ciMethod::get_bcea() {
1326 #ifdef COMPILER2
1327 if (_bcea == NULL) {
1328 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1329 }
1330 return _bcea;
1331 #else // COMPILER2
1332 ShouldNotReachHere();
1333 return NULL;
1334 #endif // COMPILER2
1335 }
1336
1337 ciMethodBlocks *ciMethod::get_method_blocks() {
1338 Arena *arena = CURRENT_ENV->arena();
1339 if (_method_blocks == NULL) {
1340 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1341 }
1342 return _method_blocks;
1343 }
1344
1345 #undef FETCH_FLAG_FROM_VM
1346
1347 void ciMethod::dump_name_as_ascii(outputStream* st) {
1348 Method* method = get_Method();
1349 st->print("%s %s %s",
1350 method->klass_name()->as_quoted_ascii(),
1351 method->name()->as_quoted_ascii(),
1352 method->signature()->as_quoted_ascii());
1353 }
1354
1355 void ciMethod::dump_replay_data(outputStream* st) {
1356 ResourceMark rm;
1357 Method* method = get_Method();
1358 MethodCounters* mcs = method->method_counters();
1359 st->print("ciMethod ");
1360 dump_name_as_ascii(st);
1361 st->print_cr(" %d %d %d %d %d",
1362 mcs == NULL ? 0 : mcs->invocation_counter()->raw_counter(),
1363 mcs == NULL ? 0 : mcs->backedge_counter()->raw_counter(),
1364 interpreter_invocation_count(),
1365 interpreter_throwout_count(),
1366 _instructions_size);
1367 }
1368
1369 // ------------------------------------------------------------------
1370 // ciMethod::print_codes
1371 //
1372 // Print a range of the bytecodes for this method.
1373 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1374 check_is_loaded();
1375 GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1376 }
1377
1378 // ------------------------------------------------------------------
1379 // ciMethod::print_name
1380 //
1381 // Print the name of this method, including signature and some flags.
1382 void ciMethod::print_name(outputStream* st) {
1383 check_is_loaded();
1384 GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1385 }
1386
1387 // ------------------------------------------------------------------
1388 // ciMethod::print_short_name
1389 //
1390 // Print the name of this method, without signature.
1391 void ciMethod::print_short_name(outputStream* st) {
1392 if (is_loaded()) {
1393 GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1394 } else {
1395 // Fall back if method is not loaded.
1396 holder()->print_name_on(st);
1397 st->print("::");
1398 name()->print_symbol_on(st);
1399 if (WizardMode)
1400 signature()->as_symbol()->print_symbol_on(st);
1401 }
1402 }
1403
1404 // ------------------------------------------------------------------
1405 // ciMethod::print_impl
1406 //
1407 // Implementation of the print method.
1408 void ciMethod::print_impl(outputStream* st) {
1409 ciMetadata::print_impl(st);
1410 st->print(" name=");
1411 name()->print_symbol_on(st);
1412 st->print(" holder=");
1413 holder()->print_name_on(st);
1414 st->print(" signature=");
1415 signature()->as_symbol()->print_symbol_on(st);
1416 if (is_loaded()) {
1417 st->print(" loaded=true");
1418 st->print(" arg_size=%d", arg_size());
1419 st->print(" flags=");
1420 flags().print_member_flags(st);
1421 } else {
1422 st->print(" loaded=false");
1423 }
1424 }
1425
1426 // ------------------------------------------------------------------
1427
1428 static BasicType erase_to_word_type(BasicType bt) {
1429 if (is_subword_type(bt)) return T_INT;
1430 if (bt == T_ARRAY) return T_OBJECT;
1431 return bt;
1432 }
1433
1434 static bool basic_types_match(ciType* t1, ciType* t2) {
1435 if (t1 == t2) return true;
1436 return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1437 }
1438
1439 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1440 bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1441 !resolved_method->is_method_handle_intrinsic();
1442
1443 if (!invoke_through_mh_intrinsic) {
1444 // Method name & descriptor should stay the same.
1445 // Signatures may reference unloaded types and thus they may be not strictly equal.
1446 ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1447 ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1448
1449 return (declared_method->name()->equals(resolved_method->name())) &&
1450 (declared_signature->equals(resolved_signature));
1451 }
1452
1453 ciMethod* linker = declared_method;
1454 ciMethod* target = resolved_method;
1455 // Linkers have appendix argument which is not passed to callee.
1456 int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1457 if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1458 return false; // argument slot count mismatch
1459 }
1460
1461 ciSignature* linker_sig = linker->signature();
1462 ciSignature* target_sig = target->signature();
1463
1464 if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1465 target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1466 return false; // argument count mismatch
1467 }
1468
1469 int sbase = 0, rbase = 0;
1470 switch (linker->intrinsic_id()) {
1471 case vmIntrinsics::_linkToVirtual:
1472 case vmIntrinsics::_linkToInterface:
1473 case vmIntrinsics::_linkToSpecial: {
1474 if (target->is_static()) {
1475 return false;
1476 }
1477 if (linker_sig->type_at(0)->is_primitive_type()) {
1478 return false; // receiver should be an oop
1479 }
1480 sbase = 1; // skip receiver
1481 break;
1482 }
1483 case vmIntrinsics::_linkToStatic: {
1484 if (!target->is_static()) {
1485 return false;
1486 }
1487 break;
1488 }
1489 case vmIntrinsics::_invokeBasic: {
1490 if (target->is_static()) {
1491 if (target_sig->type_at(0)->is_primitive_type()) {
1492 return false; // receiver should be an oop
1493 }
1494 rbase = 1; // skip receiver
1495 }
1496 break;
1497 }
1498 default:
1499 break;
1500 }
1501 assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1502 int arg_count = target_sig->count() - rbase;
1503 for (int i = 0; i < arg_count; i++) {
1504 if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1505 return false;
1506 }
1507 }
1508 // Only check the return type if the symbolic info has non-void return type.
1509 // I.e. the return value of the resolved method can be dropped.
1510 if (!linker->return_type()->is_void() &&
1511 !basic_types_match(linker->return_type(), target->return_type())) {
1512 return false;
1513 }
1514 return true; // no mismatch found
1515 }
1516
1517 // ------------------------------------------------------------------