1 /*
2 * Copyright (c) 1999, 2021, 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/ciSymbols.hpp"
36 #include "ci/ciUtilities.inline.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/methodHandles.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 assert(_holder->get_instanceKlass() == h_m->method_holder(), "");
74
75 if (LogTouchedMethods) {
76 h_m->log_touched(Thread::current());
77 }
78 // These fields are always filled in in loaded methods.
79 _flags = ciFlags(h_m->access_flags());
80
81 // Easy to compute, so fill them in now.
82 _max_stack = h_m->max_stack();
83 _max_locals = h_m->max_locals();
84 _code_size = h_m->code_size();
85 _intrinsic_id = h_m->intrinsic_id();
86 _handler_count = h_m->exception_table_length();
87 _size_of_parameters = h_m->size_of_parameters();
88 _uses_monitors = h_m->access_flags().has_monitor_bytecodes();
89 _balanced_monitors = !_uses_monitors || h_m->access_flags().is_monitor_matching();
90 _is_c1_compilable = !h_m->is_not_c1_compilable();
91 _is_c2_compilable = !h_m->is_not_c2_compilable();
92 _can_be_parsed = true;
93 _has_reserved_stack_access = h_m->has_reserved_stack_access();
94 _is_overpass = h_m->is_overpass();
95 // Lazy fields, filled in on demand. Require allocation.
96 _code = NULL;
97 _exception_handlers = NULL;
98 _liveness = NULL;
99 _method_blocks = NULL;
100 #if defined(COMPILER2)
101 _flow = NULL;
102 _bcea = NULL;
103 #endif // COMPILER2
104
105 ciEnv *env = CURRENT_ENV;
106 if (env->jvmti_can_hotswap_or_post_breakpoint()) {
107 // 6328518 check hotswap conditions under the right lock.
108 MutexLocker locker(Compile_lock);
109 if (Dependencies::check_evol_method(h_m()) != NULL) {
110 _is_c1_compilable = false;
111 _is_c2_compilable = false;
112 _can_be_parsed = false;
113 }
114 } else {
115 DEBUG_ONLY(CompilerThread::current()->check_possible_safepoint());
116 }
117
118 if (h_m->method_holder()->is_linked()) {
119 _can_be_statically_bound = h_m->can_be_statically_bound();
120 } else {
121 // Have to use a conservative value in this case.
122 _can_be_statically_bound = false;
123 }
124
125 // Adjust the definition of this condition to be more useful:
126 // %%% take these conditions into account in vtable generation
127 if (!_can_be_statically_bound && h_m->is_private())
128 _can_be_statically_bound = true;
129 if (_can_be_statically_bound && h_m->is_abstract())
130 _can_be_statically_bound = false;
131
132 // generating _signature may allow GC and therefore move m.
133 // These fields are always filled in.
134 _name = env->get_symbol(h_m->name());
135 ciSymbol* sig_symbol = env->get_symbol(h_m->signature());
136 constantPoolHandle cpool(Thread::current(), h_m->constants());
137 _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
138 _method_data = NULL;
139 _nmethod_age = h_m->nmethod_age();
140 // Take a snapshot of these values, so they will be commensurate with the MDO.
141 if (ProfileInterpreter || CompilerConfig::is_c1_profiling()) {
142 int invcnt = h_m->interpreter_invocation_count();
143 // if the value overflowed report it as max int
144 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
145 _interpreter_throwout_count = h_m->interpreter_throwout_count();
146 } else {
147 _interpreter_invocation_count = 0;
148 _interpreter_throwout_count = 0;
149 }
150 if (_interpreter_invocation_count == 0)
151 _interpreter_invocation_count = 1;
152 _instructions_size = -1;
153 #ifdef ASSERT
154 if (ReplayCompiles) {
155 ciReplay::initialize(this);
156 }
157 #endif
158
159 CompilerOracle::tag_blackhole_if_possible(h_m);
160 }
161
162
163 // ------------------------------------------------------------------
164 // ciMethod::ciMethod
165 //
166 // Unloaded method.
167 ciMethod::ciMethod(ciInstanceKlass* holder,
168 ciSymbol* name,
169 ciSymbol* signature,
170 ciInstanceKlass* accessor) :
171 ciMetadata((Metadata*)NULL),
172 _name( name),
173 _holder( holder),
174 _method_data( NULL),
175 _method_blocks( NULL),
176 _intrinsic_id( vmIntrinsics::_none),
177 _instructions_size(-1),
178 _can_be_statically_bound(false),
179 _liveness( NULL)
180 #if defined(COMPILER2)
181 ,
182 _flow( NULL),
183 _bcea( NULL)
184 #endif // COMPILER2
185 {
186 // Usually holder and accessor are the same type but in some cases
187 // the holder has the wrong class loader (e.g. invokedynamic call
188 // sites) so we pass the accessor.
189 _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
190 }
191
192
193 // ------------------------------------------------------------------
194 // ciMethod::load_code
195 //
196 // Load the bytecodes and exception handler table for this method.
197 void ciMethod::load_code() {
198 VM_ENTRY_MARK;
199 assert(is_loaded(), "only loaded methods have code");
200
201 Method* me = get_Method();
202 Arena* arena = CURRENT_THREAD_ENV->arena();
203
204 // Load the bytecodes.
205 _code = (address)arena->Amalloc(code_size());
206 memcpy(_code, me->code_base(), code_size());
207
208 #if INCLUDE_JVMTI
209 // Revert any breakpoint bytecodes in ci's copy
210 if (me->number_of_breakpoints() > 0) {
211 BreakpointInfo* bp = me->method_holder()->breakpoints();
212 for (; bp != NULL; bp = bp->next()) {
213 if (bp->match(me)) {
214 code_at_put(bp->bci(), bp->orig_bytecode());
215 }
216 }
217 }
218 #endif
219
220 // And load the exception table.
221 ExceptionTable exc_table(me);
222
223 // Allocate one extra spot in our list of exceptions. This
224 // last entry will be used to represent the possibility that
225 // an exception escapes the method. See ciExceptionHandlerStream
226 // for details.
227 _exception_handlers =
228 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
229 * (_handler_count + 1));
230 if (_handler_count > 0) {
231 for (int i=0; i<_handler_count; i++) {
232 _exception_handlers[i] = new (arena) ciExceptionHandler(
233 holder(),
234 /* start */ exc_table.start_pc(i),
235 /* limit */ exc_table.end_pc(i),
236 /* goto pc */ exc_table.handler_pc(i),
237 /* cp index */ exc_table.catch_type_index(i));
238 }
239 }
240
241 // Put an entry at the end of our list to represent the possibility
242 // of exceptional exit.
243 _exception_handlers[_handler_count] =
244 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
245
246 if (CIPrintMethodCodes) {
247 print_codes();
248 }
249 }
250
251
252 // ------------------------------------------------------------------
253 // ciMethod::has_linenumber_table
254 //
255 // length unknown until decompression
256 bool ciMethod::has_linenumber_table() const {
257 check_is_loaded();
258 VM_ENTRY_MARK;
259 return get_Method()->has_linenumber_table();
260 }
261
262
263 // ------------------------------------------------------------------
264 // ciMethod::line_number_from_bci
265 int ciMethod::line_number_from_bci(int bci) const {
266 check_is_loaded();
267 VM_ENTRY_MARK;
268 return get_Method()->line_number_from_bci(bci);
269 }
270
271
272 // ------------------------------------------------------------------
273 // ciMethod::vtable_index
274 //
275 // Get the position of this method's entry in the vtable, if any.
276 int ciMethod::vtable_index() {
277 check_is_loaded();
278 assert(holder()->is_linked(), "must be linked");
279 VM_ENTRY_MARK;
280 return get_Method()->vtable_index();
281 }
282
283 // ------------------------------------------------------------------
284 // ciMethod::uses_balanced_monitors
285 //
286 // Does this method use monitors in a strict stack-disciplined manner?
287 bool ciMethod::has_balanced_monitors() {
288 check_is_loaded();
289 if (_balanced_monitors) return true;
290
291 // Analyze the method to see if monitors are used properly.
292 VM_ENTRY_MARK;
293 methodHandle method(THREAD, get_Method());
294 assert(method->has_monitor_bytecodes(), "should have checked this");
295
296 // Check to see if a previous compilation computed the
297 // monitor-matching analysis.
298 if (method->guaranteed_monitor_matching()) {
299 _balanced_monitors = true;
300 return true;
301 }
302
303 {
304 ExceptionMark em(THREAD);
305 ResourceMark rm(THREAD);
306 GeneratePairingInfo gpi(method);
307 if (!gpi.compute_map(THREAD)) {
308 fatal("Unrecoverable verification or out-of-memory error");
309 }
310 if (!gpi.monitor_safe()) {
311 return false;
312 }
313 method->set_guaranteed_monitor_matching();
314 _balanced_monitors = true;
315 }
316 return true;
317 }
318
319
320 // ------------------------------------------------------------------
321 // ciMethod::get_flow_analysis
322 ciTypeFlow* ciMethod::get_flow_analysis() {
323 #if defined(COMPILER2)
324 if (_flow == NULL) {
325 ciEnv* env = CURRENT_ENV;
326 _flow = new (env->arena()) ciTypeFlow(env, this);
327 _flow->do_flow();
328 }
329 return _flow;
330 #else // COMPILER2
331 ShouldNotReachHere();
332 return NULL;
333 #endif // COMPILER2
334 }
335
336
337 // ------------------------------------------------------------------
338 // ciMethod::get_osr_flow_analysis
339 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
340 #if defined(COMPILER2)
341 // OSR entry points are always place after a call bytecode of some sort
342 assert(osr_bci >= 0, "must supply valid OSR entry point");
343 ciEnv* env = CURRENT_ENV;
344 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
345 flow->do_flow();
346 return flow;
347 #else // COMPILER2
348 ShouldNotReachHere();
349 return NULL;
350 #endif // COMPILER2
351 }
352
353 // ------------------------------------------------------------------
354 // ciMethod::raw_liveness_at_bci
355 //
356 // Which local variables are live at a specific bci?
357 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
358 check_is_loaded();
359 if (_liveness == NULL) {
360 // Create the liveness analyzer.
361 Arena* arena = CURRENT_ENV->arena();
362 _liveness = new (arena) MethodLiveness(arena, this);
363 _liveness->compute_liveness();
364 }
365 return _liveness->get_liveness_at(bci);
366 }
367
368 // ------------------------------------------------------------------
369 // ciMethod::liveness_at_bci
370 //
371 // Which local variables are live at a specific bci? When debugging
372 // will return true for all locals in some cases to improve debug
373 // information.
374 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
375 if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot) {
376 // Keep all locals live for the user's edification and amusement.
377 MethodLivenessResult result(_max_locals);
378 result.set_range(0, _max_locals);
379 result.set_is_valid();
380 return result;
381 }
382 return raw_liveness_at_bci(bci);
383 }
384
385 // ciMethod::live_local_oops_at_bci
386 //
387 // find all the live oops in the locals array for a particular bci
388 // Compute what the interpreter believes by using the interpreter
389 // oopmap generator. This is used as a double check during osr to
390 // guard against conservative result from MethodLiveness making us
391 // think a dead oop is live. MethodLiveness is conservative in the
392 // sense that it may consider locals to be live which cannot be live,
393 // like in the case where a local could contain an oop or a primitive
394 // along different paths. In that case the local must be dead when
395 // those paths merge. Since the interpreter's viewpoint is used when
396 // gc'ing an interpreter frame we need to use its viewpoint during
397 // OSR when loading the locals.
398
399 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
400 VM_ENTRY_MARK;
401 InterpreterOopMap mask;
402 OopMapCache::compute_one_oop_map(methodHandle(THREAD, get_Method()), bci, &mask);
403 int mask_size = max_locals();
404 ResourceBitMap result(mask_size);
405 int i;
406 for (i = 0; i < mask_size ; i++ ) {
407 if (mask.is_oop(i)) result.set_bit(i);
408 }
409 return result;
410 }
411
412
413 #ifdef COMPILER1
414 // ------------------------------------------------------------------
415 // ciMethod::bci_block_start
416 //
417 // Marks all bcis where a new basic block starts
418 const BitMap& ciMethod::bci_block_start() {
419 check_is_loaded();
420 if (_liveness == NULL) {
421 // Create the liveness analyzer.
422 Arena* arena = CURRENT_ENV->arena();
423 _liveness = new (arena) MethodLiveness(arena, this);
424 _liveness->compute_liveness();
425 }
426
427 return _liveness->get_bci_block_start();
428 }
429 #endif // COMPILER1
430
431
432 // ------------------------------------------------------------------
433 // ciMethod::check_overflow
434 //
435 // Check whether the profile counter is overflowed and adjust if true.
436 // For invoke* it will turn negative values into max_jint,
437 // and for checkcast/aastore/instanceof turn positive values into min_jint.
438 int ciMethod::check_overflow(int c, Bytecodes::Code code) {
439 switch (code) {
440 case Bytecodes::_aastore: // fall-through
441 case Bytecodes::_checkcast: // fall-through
442 case Bytecodes::_instanceof: {
443 return (c > 0 ? min_jint : c); // always non-positive
444 }
445 default: {
446 assert(Bytecodes::is_invoke(code), "%s", Bytecodes::name(code));
447 return (c < 0 ? max_jint : c); // always non-negative
448 }
449 }
450 }
451
452
453 // ------------------------------------------------------------------
454 // ciMethod::call_profile_at_bci
455 //
456 // Get the ciCallProfile for the invocation of this method.
457 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
458 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
459 ResourceMark rm;
460 ciCallProfile result;
461 if (method_data() != NULL && method_data()->is_mature()) {
462 ciProfileData* data = method_data()->bci_to_data(bci);
463 if (data != NULL && data->is_CounterData()) {
464 // Every profiled call site has a counter.
465 int count = check_overflow(data->as_CounterData()->count(), java_code_at_bci(bci));
466
467 if (!data->is_ReceiverTypeData()) {
468 result._receiver_count[0] = 0; // that's a definite zero
469 } else { // ReceiverTypeData is a subclass of CounterData
470 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
471 // In addition, virtual call sites have receiver type information
472 int receivers_count_total = 0;
473 int morphism = 0;
474 // Precompute morphism for the possible fixup
475 for (uint i = 0; i < call->row_limit(); i++) {
476 ciKlass* receiver = call->receiver(i);
477 if (receiver == NULL) continue;
478 morphism++;
479 }
480 int epsilon = 0;
481 // For a call, it is assumed that either the type of the receiver(s)
482 // is recorded or an associated counter is incremented, but not both. With
483 // tiered compilation, however, both can happen due to the interpreter and
484 // C1 profiling invocations differently. Address that inconsistency here.
485 if (morphism == 1 && count > 0) {
486 epsilon = count;
487 count = 0;
488 }
489 for (uint i = 0; i < call->row_limit(); i++) {
490 ciKlass* receiver = call->receiver(i);
491 if (receiver == NULL) continue;
492 int rcount = saturated_add(call->receiver_count(i), epsilon);
493 if (rcount == 0) rcount = 1; // Should be valid value
494 receivers_count_total = saturated_add(receivers_count_total, rcount);
495 // Add the receiver to result data.
496 result.add_receiver(receiver, rcount);
497 // If we extend profiling to record methods,
498 // we will set result._method also.
499 }
500 // Determine call site's morphism.
501 // The call site count is 0 with known morphism (only 1 or 2 receivers)
502 // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
503 // The call site count is > 0 in the case of a polymorphic virtual call.
504 if (morphism > 0 && morphism == result._limit) {
505 // The morphism <= MorphismLimit.
506 if ((morphism < ciCallProfile::MorphismLimit) ||
507 (morphism == ciCallProfile::MorphismLimit && count == 0)) {
508 #ifdef ASSERT
509 if (count > 0) {
510 this->print_short_name(tty);
511 tty->print_cr(" @ bci:%d", bci);
512 this->print_codes();
513 assert(false, "this call site should not be polymorphic");
514 }
515 #endif
516 result._morphism = morphism;
517 }
518 }
519 // Make the count consistent if this is a call profile. If count is
520 // zero or less, presume that this is a typecheck profile and
521 // do nothing. Otherwise, increase count to be the sum of all
522 // receiver's counts.
523 if (count >= 0) {
524 count = saturated_add(count, receivers_count_total);
525 }
526 }
527 result._count = count;
528 }
529 }
530 return result;
531 }
532
533 // ------------------------------------------------------------------
534 // Add new receiver and sort data by receiver's profile count.
535 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
536 // Add new receiver and sort data by receiver's counts when we have space
537 // for it otherwise replace the less called receiver (less called receiver
538 // is placed to the last array element which is not used).
539 // First array's element contains most called receiver.
540 int i = _limit;
541 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
542 _receiver[i] = _receiver[i-1];
543 _receiver_count[i] = _receiver_count[i-1];
544 }
545 _receiver[i] = receiver;
546 _receiver_count[i] = receiver_count;
547 if (_limit < MorphismLimit) _limit++;
548 }
549
550
551 void ciMethod::assert_virtual_call_type_ok(int bci) {
552 assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
553 java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
554 }
555
556 void ciMethod::assert_call_type_ok(int bci) {
557 assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
558 java_code_at_bci(bci) == Bytecodes::_invokespecial ||
559 java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
560 }
561
562 /**
563 * Check whether profiling provides a type for the argument i to the
564 * call at bci bci
565 *
566 * @param [in]bci bci of the call
567 * @param [in]i argument number
568 * @param [out]type profiled type of argument, NULL if none
569 * @param [out]ptr_kind whether always null, never null or maybe null
570 * @return true if profiling exists
571 *
572 */
573 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
574 if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
575 ciProfileData* data = method_data()->bci_to_data(bci);
576 if (data != NULL) {
577 if (data->is_VirtualCallTypeData()) {
578 assert_virtual_call_type_ok(bci);
579 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
580 if (i >= call->number_of_arguments()) {
581 return false;
582 }
583 type = call->valid_argument_type(i);
584 ptr_kind = call->argument_ptr_kind(i);
585 return true;
586 } else if (data->is_CallTypeData()) {
587 assert_call_type_ok(bci);
588 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
589 if (i >= call->number_of_arguments()) {
590 return false;
591 }
592 type = call->valid_argument_type(i);
593 ptr_kind = call->argument_ptr_kind(i);
594 return true;
595 }
596 }
597 }
598 return false;
599 }
600
601 /**
602 * Check whether profiling provides a type for the return value from
603 * the call at bci bci
604 *
605 * @param [in]bci bci of the call
606 * @param [out]type profiled type of argument, NULL if none
607 * @param [out]ptr_kind whether always null, never null or maybe null
608 * @return true if profiling exists
609 *
610 */
611 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
612 if (MethodData::profile_return() && method_data() != NULL && method_data()->is_mature()) {
613 ciProfileData* data = method_data()->bci_to_data(bci);
614 if (data != NULL) {
615 if (data->is_VirtualCallTypeData()) {
616 assert_virtual_call_type_ok(bci);
617 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
618 if (call->has_return()) {
619 type = call->valid_return_type();
620 ptr_kind = call->return_ptr_kind();
621 return true;
622 }
623 } else if (data->is_CallTypeData()) {
624 assert_call_type_ok(bci);
625 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
626 if (call->has_return()) {
627 type = call->valid_return_type();
628 ptr_kind = call->return_ptr_kind();
629 }
630 return true;
631 }
632 }
633 }
634 return false;
635 }
636
637 /**
638 * Check whether profiling provides a type for the parameter i
639 *
640 * @param [in]i parameter number
641 * @param [out]type profiled type of parameter, NULL if none
642 * @param [out]ptr_kind whether always null, never null or maybe null
643 * @return true if profiling exists
644 *
645 */
646 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
647 if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
648 ciParametersTypeData* parameters = method_data()->parameters_type_data();
649 if (parameters != NULL && i < parameters->number_of_parameters()) {
650 type = parameters->valid_parameter_type(i);
651 ptr_kind = parameters->parameter_ptr_kind(i);
652 return true;
653 }
654 }
655 return false;
656 }
657
658
659 // ------------------------------------------------------------------
660 // ciMethod::find_monomorphic_target
661 //
662 // Given a certain calling environment, find the monomorphic target
663 // for the call. Return NULL if the call is not monomorphic in
664 // its calling environment, or if there are only abstract methods.
665 // The returned method is never abstract.
666 // Note: If caller uses a non-null result, it must inform dependencies
667 // via assert_unique_concrete_method or assert_leaf_type.
668 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
669 ciInstanceKlass* callee_holder,
670 ciInstanceKlass* actual_recv,
671 bool check_access) {
672 check_is_loaded();
673
674 if (actual_recv->is_interface()) {
675 // %%% We cannot trust interface types, yet. See bug 6312651.
676 return NULL;
677 }
678
679 ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access, true /* allow_abstract */);
680 if (root_m == NULL) {
681 // Something went wrong looking up the actual receiver method.
682 return NULL;
683 }
684
685 // Make certain quick checks even if UseCHA is false.
686
687 // Is it private or final?
688 if (root_m->can_be_statically_bound()) {
689 assert(!root_m->is_abstract(), "sanity");
690 return root_m;
691 }
692
693 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
694 // Easy case. There is no other place to put a method, so don't bother
695 // to go through the VM_ENTRY_MARK and all the rest.
696 if (root_m->is_abstract()) {
697 return NULL;
698 }
699 return root_m;
700 }
701
702 // Array methods (clone, hashCode, etc.) are always statically bound.
703 // If we were to see an array type here, we'd return root_m.
704 // However, this method processes only ciInstanceKlasses. (See 4962591.)
705 // The inline_native_clone intrinsic narrows Object to T[] properly,
706 // so there is no need to do the same job here.
707
708 if (!UseCHA) return NULL;
709
710 VM_ENTRY_MARK;
711
712 methodHandle target;
713 {
714 MutexLocker locker(Compile_lock);
715 InstanceKlass* context = actual_recv->get_instanceKlass();
716 if (UseVtableBasedCHA) {
717 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context,
718 root_m->get_Method(),
719 callee_holder->get_Klass(),
720 this->get_Method()));
721 } else {
722 if (root_m->is_abstract()) {
723 return NULL; // not supported
724 }
725 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context, root_m->get_Method()));
726 }
727 assert(target() == NULL || !target()->is_abstract(), "not allowed");
728 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
729 }
730
731 #ifndef PRODUCT
732 if (TraceDependencies && target() != NULL && target() != root_m->get_Method()) {
733 tty->print("found a non-root unique target method");
734 tty->print_cr(" context = %s", actual_recv->get_Klass()->external_name());
735 tty->print(" method = ");
736 target->print_short_name(tty);
737 tty->cr();
738 }
739 #endif //PRODUCT
740
741 if (target() == NULL) {
742 return NULL;
743 }
744 if (target() == root_m->get_Method()) {
745 return root_m;
746 }
747 if (!root_m->is_public() &&
748 !root_m->is_protected()) {
749 // If we are going to reason about inheritance, it's easiest
750 // if the method in question is public, protected, or private.
751 // If the answer is not root_m, it is conservatively correct
752 // to return NULL, even if the CHA encountered irrelevant
753 // methods in other packages.
754 // %%% TO DO: Work out logic for package-private methods
755 // with the same name but different vtable indexes.
756 return NULL;
757 }
758 return CURRENT_THREAD_ENV->get_method(target());
759 }
760
761 // ------------------------------------------------------------------
762 // ciMethod::can_be_statically_bound
763 //
764 // Tries to determine whether a method can be statically bound in some context.
765 bool ciMethod::can_be_statically_bound(ciInstanceKlass* context) const {
766 return (holder() == context) && can_be_statically_bound();
767 }
768
769 // ------------------------------------------------------------------
770 // ciMethod::resolve_invoke
771 //
772 // Given a known receiver klass, find the target for the call.
773 // Return NULL if the call has no target or the target is abstract.
774 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access, bool allow_abstract) {
775 check_is_loaded();
776 VM_ENTRY_MARK;
777
778 Klass* caller_klass = caller->get_Klass();
779 Klass* recv = exact_receiver->get_Klass();
780 Klass* resolved = holder()->get_Klass();
781 Symbol* h_name = name()->get_symbol();
782 Symbol* h_signature = signature()->get_symbol();
783
784 LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
785 check_access ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
786 check_access ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
787 Method* m = NULL;
788 // Only do exact lookup if receiver klass has been linked. Otherwise,
789 // the vtable has not been setup, and the LinkResolver will fail.
790 if (recv->is_array_klass()
791 ||
792 (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
793 if (holder()->is_interface()) {
794 m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
795 } else {
796 m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
797 }
798 }
799
800 if (m == NULL) {
801 // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
802 return NULL;
803 }
804
805 ciMethod* result = this;
806 if (m != get_Method()) {
807 result = CURRENT_THREAD_ENV->get_method(m);
808 }
809
810 if (result->is_abstract() && !allow_abstract) {
811 // Don't return abstract methods because they aren't optimizable or interesting.
812 return NULL;
813 }
814 return result;
815 }
816
817 // ------------------------------------------------------------------
818 // ciMethod::resolve_vtable_index
819 //
820 // Given a known receiver klass, find the vtable index for the call.
821 // Return Method::invalid_vtable_index if the vtable_index is unknown.
822 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
823 check_is_loaded();
824
825 int vtable_index = Method::invalid_vtable_index;
826 // Only do lookup if receiver klass has been linked. Otherwise,
827 // the vtable has not been setup, and the LinkResolver will fail.
828 if (!receiver->is_interface()
829 && (!receiver->is_instance_klass() ||
830 receiver->as_instance_klass()->is_linked())) {
831 VM_ENTRY_MARK;
832
833 Klass* caller_klass = caller->get_Klass();
834 Klass* recv = receiver->get_Klass();
835 Symbol* h_name = name()->get_symbol();
836 Symbol* h_signature = signature()->get_symbol();
837
838 LinkInfo link_info(recv, h_name, h_signature, caller_klass);
839 vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
840 if (vtable_index == Method::nonvirtual_vtable_index) {
841 // A statically bound method. Return "no such index".
842 vtable_index = Method::invalid_vtable_index;
843 }
844 }
845
846 return vtable_index;
847 }
848
849 // ------------------------------------------------------------------
850 // ciMethod::get_field_at_bci
851 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
852 ciBytecodeStream iter(this);
853 iter.reset_to_bci(bci);
854 iter.next();
855 return iter.get_field(will_link);
856 }
857
858 // ------------------------------------------------------------------
859 // ciMethod::get_method_at_bci
860 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
861 ciBytecodeStream iter(this);
862 iter.reset_to_bci(bci);
863 iter.next();
864 return iter.get_method(will_link, declared_signature);
865 }
866
867 // ------------------------------------------------------------------
868 ciKlass* ciMethod::get_declared_method_holder_at_bci(int bci) {
869 ciBytecodeStream iter(this);
870 iter.reset_to_bci(bci);
871 iter.next();
872 return iter.get_declared_method_holder();
873 }
874
875 // ------------------------------------------------------------------
876 // Adjust a CounterData count to be commensurate with
877 // interpreter_invocation_count. If the MDO exists for
878 // only 25% of the time the method exists, then the
879 // counts in the MDO should be scaled by 4X, so that
880 // they can be usefully and stably compared against the
881 // invocation counts in methods.
882 int ciMethod::scale_count(int count, float prof_factor) {
883 if (count > 0 && method_data() != NULL) {
884 int counter_life = method_data()->invocation_count();
885 int method_life = interpreter_invocation_count();
886 if (method_life < counter_life) { // may happen because of the snapshot timing
887 method_life = counter_life;
888 }
889 if (counter_life > 0) {
890 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
891 count = (count > 0) ? count : 1;
892 } else {
893 count = 1;
894 }
895 }
896 return count;
897 }
898
899
900 // ------------------------------------------------------------------
901 // ciMethod::is_special_get_caller_class_method
902 //
903 bool ciMethod::is_ignored_by_security_stack_walk() const {
904 check_is_loaded();
905 VM_ENTRY_MARK;
906 return get_Method()->is_ignored_by_security_stack_walk();
907 }
908
909 // ------------------------------------------------------------------
910 // ciMethod::needs_clinit_barrier
911 //
912 bool ciMethod::needs_clinit_barrier() const {
913 check_is_loaded();
914 return is_static() && !holder()->is_initialized();
915 }
916
917 // ------------------------------------------------------------------
918 // invokedynamic support
919
920 // ------------------------------------------------------------------
921 // ciMethod::is_method_handle_intrinsic
922 //
923 // Return true if the method is an instance of the JVM-generated
924 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
925 bool ciMethod::is_method_handle_intrinsic() const {
926 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
927 return (MethodHandles::is_signature_polymorphic(iid) &&
928 MethodHandles::is_signature_polymorphic_intrinsic(iid));
929 }
930
931 // ------------------------------------------------------------------
932 // ciMethod::is_compiled_lambda_form
933 //
934 // Return true if the method is a generated MethodHandle adapter.
935 // These are built by Java code.
936 bool ciMethod::is_compiled_lambda_form() const {
937 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
938 return iid == vmIntrinsics::_compiledLambdaForm;
939 }
940
941 // ------------------------------------------------------------------
942 // ciMethod::is_object_initializer
943 //
944 bool ciMethod::is_object_initializer() const {
945 return name() == ciSymbols::object_initializer_name();
946 }
947
948 // ------------------------------------------------------------------
949 // ciMethod::has_member_arg
950 //
951 // Return true if the method is a linker intrinsic like _linkToVirtual.
952 // These are built by the JVM.
953 bool ciMethod::has_member_arg() const {
954 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
955 return (MethodHandles::is_signature_polymorphic(iid) &&
956 MethodHandles::has_member_arg(iid));
957 }
958
959 // ------------------------------------------------------------------
960 // ciMethod::ensure_method_data
961 //
962 // Generate new MethodData* objects at compile time.
963 // Return true if allocation was successful or no MDO is required.
964 bool ciMethod::ensure_method_data(const methodHandle& h_m) {
965 EXCEPTION_CONTEXT;
966 if (is_native() || is_abstract() || h_m()->is_accessor()) {
967 return true;
968 }
969 if (h_m()->method_data() == NULL) {
970 Method::build_interpreter_method_data(h_m, THREAD);
971 if (HAS_PENDING_EXCEPTION) {
972 CLEAR_PENDING_EXCEPTION;
973 }
974 }
975 if (h_m()->method_data() != NULL) {
976 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
977 return _method_data->load_data();
978 } else {
979 _method_data = CURRENT_ENV->get_empty_methodData();
980 return false;
981 }
982 }
983
984 // public, retroactive version
985 bool ciMethod::ensure_method_data() {
986 bool result = true;
987 if (_method_data == NULL || _method_data->is_empty()) {
988 GUARDED_VM_ENTRY({
989 methodHandle mh(Thread::current(), get_Method());
990 result = ensure_method_data(mh);
991 });
992 }
993 return result;
994 }
995
996
997 // ------------------------------------------------------------------
998 // ciMethod::method_data
999 //
1000 ciMethodData* ciMethod::method_data() {
1001 if (_method_data != NULL) {
1002 return _method_data;
1003 }
1004 VM_ENTRY_MARK;
1005 ciEnv* env = CURRENT_ENV;
1006 Thread* my_thread = JavaThread::current();
1007 methodHandle h_m(my_thread, get_Method());
1008
1009 if (h_m()->method_data() != NULL) {
1010 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1011 _method_data->load_data();
1012 } else {
1013 _method_data = CURRENT_ENV->get_empty_methodData();
1014 }
1015 return _method_data;
1016
1017 }
1018
1019 // ------------------------------------------------------------------
1020 // ciMethod::method_data_or_null
1021 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1022 // NULL otherwise.
1023 ciMethodData* ciMethod::method_data_or_null() {
1024 ciMethodData *md = method_data();
1025 if (md->is_empty()) {
1026 return NULL;
1027 }
1028 return md;
1029 }
1030
1031 // ------------------------------------------------------------------
1032 // ciMethod::ensure_method_counters
1033 //
1034 MethodCounters* ciMethod::ensure_method_counters() {
1035 check_is_loaded();
1036 VM_ENTRY_MARK;
1037 methodHandle mh(THREAD, get_Method());
1038 MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1039 return method_counters;
1040 }
1041
1042 // ------------------------------------------------------------------
1043 // ciMethod::has_option
1044 //
1045 bool ciMethod::has_option(enum CompileCommand option) {
1046 check_is_loaded();
1047 VM_ENTRY_MARK;
1048 methodHandle mh(THREAD, get_Method());
1049 return CompilerOracle::has_option(mh, option);
1050 }
1051
1052 // ------------------------------------------------------------------
1053 // ciMethod::has_option_value
1054 //
1055 bool ciMethod::has_option_value(enum CompileCommand option, double& value) {
1056 check_is_loaded();
1057 VM_ENTRY_MARK;
1058 methodHandle mh(THREAD, get_Method());
1059 return CompilerOracle::has_option_value(mh, option, value);
1060 }
1061 // ------------------------------------------------------------------
1062 // ciMethod::can_be_compiled
1063 //
1064 // Have previous compilations of this method succeeded?
1065 bool ciMethod::can_be_compiled() {
1066 check_is_loaded();
1067 ciEnv* env = CURRENT_ENV;
1068 if (is_c1_compile(env->comp_level())) {
1069 return _is_c1_compilable;
1070 }
1071 return _is_c2_compilable;
1072 }
1073
1074 // ------------------------------------------------------------------
1075 // ciMethod::has_compiled_code
1076 bool ciMethod::has_compiled_code() {
1077 return instructions_size() > 0;
1078 }
1079
1080 int ciMethod::highest_osr_comp_level() {
1081 check_is_loaded();
1082 VM_ENTRY_MARK;
1083 return get_Method()->highest_osr_comp_level();
1084 }
1085
1086 // ------------------------------------------------------------------
1087 // ciMethod::code_size_for_inlining
1088 //
1089 // Code size for inlining decisions. This method returns a code
1090 // size of 1 for methods which has the ForceInline annotation.
1091 int ciMethod::code_size_for_inlining() {
1092 check_is_loaded();
1093 if (get_Method()->force_inline()) {
1094 return 1;
1095 }
1096 return code_size();
1097 }
1098
1099 // ------------------------------------------------------------------
1100 // ciMethod::instructions_size
1101 //
1102 // This is a rough metric for "fat" methods, compared before inlining
1103 // with InlineSmallCode. The CodeBlob::code_size accessor includes
1104 // junk like exception handler, stubs, and constant table, which are
1105 // not highly relevant to an inlined method. So we use the more
1106 // specific accessor nmethod::insts_size.
1107 int ciMethod::instructions_size() {
1108 if (_instructions_size == -1) {
1109 GUARDED_VM_ENTRY(
1110 CompiledMethod* code = get_Method()->code();
1111 if (code != NULL && (code->comp_level() == CompLevel_full_optimization)) {
1112 _instructions_size = code->insts_end() - code->verified_entry_point();
1113 } else {
1114 _instructions_size = 0;
1115 }
1116 );
1117 }
1118 return _instructions_size;
1119 }
1120
1121 // ------------------------------------------------------------------
1122 // ciMethod::log_nmethod_identity
1123 void ciMethod::log_nmethod_identity(xmlStream* log) {
1124 GUARDED_VM_ENTRY(
1125 CompiledMethod* code = get_Method()->code();
1126 if (code != NULL) {
1127 code->log_identity(log);
1128 }
1129 )
1130 }
1131
1132 // ------------------------------------------------------------------
1133 // ciMethod::is_not_reached
1134 bool ciMethod::is_not_reached(int bci) {
1135 check_is_loaded();
1136 VM_ENTRY_MARK;
1137 return Interpreter::is_not_reached(
1138 methodHandle(THREAD, get_Method()), bci);
1139 }
1140
1141 // ------------------------------------------------------------------
1142 // ciMethod::was_never_executed
1143 bool ciMethod::was_executed_more_than(int times) {
1144 VM_ENTRY_MARK;
1145 return get_Method()->was_executed_more_than(times);
1146 }
1147
1148 // ------------------------------------------------------------------
1149 // ciMethod::has_unloaded_classes_in_signature
1150 bool ciMethod::has_unloaded_classes_in_signature() {
1151 VM_ENTRY_MARK;
1152 {
1153 ExceptionMark em(THREAD);
1154 methodHandle m(THREAD, get_Method());
1155 bool has_unloaded = Method::has_unloaded_classes_in_signature(m, thread);
1156 if( HAS_PENDING_EXCEPTION ) {
1157 CLEAR_PENDING_EXCEPTION;
1158 return true; // Declare that we may have unloaded classes
1159 }
1160 return has_unloaded;
1161 }
1162 }
1163
1164 // ------------------------------------------------------------------
1165 // ciMethod::is_klass_loaded
1166 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1167 VM_ENTRY_MARK;
1168 return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);
1169 }
1170
1171 // ------------------------------------------------------------------
1172 // ciMethod::check_call
1173 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1174 // This method is used only in C2 from InlineTree::ok_to_inline,
1175 // and is only used under -Xcomp.
1176 // It appears to fail when applied to an invokeinterface call site.
1177 // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1178 VM_ENTRY_MARK;
1179 {
1180 ExceptionMark em(THREAD);
1181 HandleMark hm(THREAD);
1182 constantPoolHandle pool (THREAD, get_Method()->constants());
1183 Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1184 Method* spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1185 if (HAS_PENDING_EXCEPTION) {
1186 CLEAR_PENDING_EXCEPTION;
1187 return false;
1188 } else {
1189 return (spec_method->is_static() == is_static);
1190 }
1191 }
1192 return false;
1193 }
1194
1195 // ------------------------------------------------------------------
1196 // ciMethod::profile_aging
1197 //
1198 // Should the method be compiled with an age counter?
1199 bool ciMethod::profile_aging() const {
1200 return UseCodeAging && (!MethodCounters::is_nmethod_hot(nmethod_age()) &&
1201 !MethodCounters::is_nmethod_age_unset(nmethod_age()));
1202 }
1203 // ------------------------------------------------------------------
1204 // ciMethod::print_codes
1205 //
1206 // Print the bytecodes for this method.
1207 void ciMethod::print_codes_on(outputStream* st) {
1208 check_is_loaded();
1209 GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1210 }
1211
1212
1213 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1214 check_is_loaded(); \
1215 VM_ENTRY_MARK; \
1216 return get_Method()->flag_accessor(); \
1217 }
1218
1219 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1220 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1221 bool ciMethod::is_getter () const { FETCH_FLAG_FROM_VM(is_getter); }
1222 bool ciMethod::is_setter () const { FETCH_FLAG_FROM_VM(is_setter); }
1223 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1224 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); }
1225 bool ciMethod::is_empty () const { FETCH_FLAG_FROM_VM(is_empty_method); }
1226
1227 bool ciMethod::is_boxing_method() const {
1228 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1229 switch (intrinsic_id()) {
1230 case vmIntrinsics::_Boolean_valueOf:
1231 case vmIntrinsics::_Byte_valueOf:
1232 case vmIntrinsics::_Character_valueOf:
1233 case vmIntrinsics::_Short_valueOf:
1234 case vmIntrinsics::_Integer_valueOf:
1235 case vmIntrinsics::_Long_valueOf:
1236 case vmIntrinsics::_Float_valueOf:
1237 case vmIntrinsics::_Double_valueOf:
1238 return true;
1239 default:
1240 return false;
1241 }
1242 }
1243 return false;
1244 }
1245
1246 bool ciMethod::is_unboxing_method() const {
1247 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1248 switch (intrinsic_id()) {
1249 case vmIntrinsics::_booleanValue:
1250 case vmIntrinsics::_byteValue:
1251 case vmIntrinsics::_charValue:
1252 case vmIntrinsics::_shortValue:
1253 case vmIntrinsics::_intValue:
1254 case vmIntrinsics::_longValue:
1255 case vmIntrinsics::_floatValue:
1256 case vmIntrinsics::_doubleValue:
1257 return true;
1258 default:
1259 return false;
1260 }
1261 }
1262 return false;
1263 }
1264
1265 bool ciMethod::is_vector_method() const {
1266 return (holder() == ciEnv::current()->vector_VectorSupport_klass()) &&
1267 (intrinsic_id() != vmIntrinsics::_none);
1268 }
1269
1270 BCEscapeAnalyzer *ciMethod::get_bcea() {
1271 #ifdef COMPILER2
1272 if (_bcea == NULL) {
1273 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1274 }
1275 return _bcea;
1276 #else // COMPILER2
1277 ShouldNotReachHere();
1278 return NULL;
1279 #endif // COMPILER2
1280 }
1281
1282 ciMethodBlocks *ciMethod::get_method_blocks() {
1283 if (_method_blocks == NULL) {
1284 Arena *arena = CURRENT_ENV->arena();
1285 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1286 }
1287 return _method_blocks;
1288 }
1289
1290 #undef FETCH_FLAG_FROM_VM
1291
1292 void ciMethod::dump_name_as_ascii(outputStream* st, Method* method) {
1293 st->print("%s %s %s",
1294 CURRENT_ENV->replay_name(method->method_holder()),
1295 method->name()->as_quoted_ascii(),
1296 method->signature()->as_quoted_ascii());
1297 }
1298
1299 void ciMethod::dump_name_as_ascii(outputStream* st) {
1300 Method* method = get_Method();
1301 dump_name_as_ascii(st, method);
1302 }
1303
1304 void ciMethod::dump_replay_data(outputStream* st) {
1305 ResourceMark rm;
1306 Method* method = get_Method();
1307 if (MethodHandles::is_signature_polymorphic_method(method)) {
1308 // ignore for now
1309 return;
1310 }
1311 MethodCounters* mcs = method->method_counters();
1312 st->print("ciMethod ");
1313 dump_name_as_ascii(st);
1314 st->print_cr(" %d %d %d %d %d",
1315 mcs == NULL ? 0 : mcs->invocation_counter()->raw_counter(),
1316 mcs == NULL ? 0 : mcs->backedge_counter()->raw_counter(),
1317 interpreter_invocation_count(),
1318 interpreter_throwout_count(),
1319 _instructions_size);
1320 }
1321
1322 // ------------------------------------------------------------------
1323 // ciMethod::print_codes
1324 //
1325 // Print a range of the bytecodes for this method.
1326 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1327 check_is_loaded();
1328 GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1329 }
1330
1331 // ------------------------------------------------------------------
1332 // ciMethod::print_name
1333 //
1334 // Print the name of this method, including signature and some flags.
1335 void ciMethod::print_name(outputStream* st) {
1336 check_is_loaded();
1337 GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1338 }
1339
1340 // ------------------------------------------------------------------
1341 // ciMethod::print_short_name
1342 //
1343 // Print the name of this method, without signature.
1344 void ciMethod::print_short_name(outputStream* st) {
1345 if (is_loaded()) {
1346 GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1347 } else {
1348 // Fall back if method is not loaded.
1349 holder()->print_name_on(st);
1350 st->print("::");
1351 name()->print_symbol_on(st);
1352 if (WizardMode)
1353 signature()->as_symbol()->print_symbol_on(st);
1354 }
1355 }
1356
1357 // ------------------------------------------------------------------
1358 // ciMethod::print_impl
1359 //
1360 // Implementation of the print method.
1361 void ciMethod::print_impl(outputStream* st) {
1362 ciMetadata::print_impl(st);
1363 st->print(" name=");
1364 name()->print_symbol_on(st);
1365 st->print(" holder=");
1366 holder()->print_name_on(st);
1367 st->print(" signature=");
1368 signature()->as_symbol()->print_symbol_on(st);
1369 if (is_loaded()) {
1370 st->print(" loaded=true");
1371 st->print(" arg_size=%d", arg_size());
1372 st->print(" flags=");
1373 flags().print_member_flags(st);
1374 } else {
1375 st->print(" loaded=false");
1376 }
1377 }
1378
1379 // ------------------------------------------------------------------
1380
1381 static BasicType erase_to_word_type(BasicType bt) {
1382 if (is_subword_type(bt)) return T_INT;
1383 if (is_reference_type(bt)) return T_OBJECT;
1384 return bt;
1385 }
1386
1387 static bool basic_types_match(ciType* t1, ciType* t2) {
1388 if (t1 == t2) return true;
1389 return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1390 }
1391
1392 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1393 bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1394 !resolved_method->is_method_handle_intrinsic();
1395
1396 if (!invoke_through_mh_intrinsic) {
1397 // Method name & descriptor should stay the same.
1398 // Signatures may reference unloaded types and thus they may be not strictly equal.
1399 ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1400 ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1401
1402 return (declared_method->name()->equals(resolved_method->name())) &&
1403 (declared_signature->equals(resolved_signature));
1404 }
1405
1406 ciMethod* linker = declared_method;
1407 ciMethod* target = resolved_method;
1408 // Linkers have appendix argument which is not passed to callee.
1409 int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1410 if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1411 return false; // argument slot count mismatch
1412 }
1413
1414 ciSignature* linker_sig = linker->signature();
1415 ciSignature* target_sig = target->signature();
1416
1417 if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1418 target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1419 return false; // argument count mismatch
1420 }
1421
1422 int sbase = 0, rbase = 0;
1423 switch (linker->intrinsic_id()) {
1424 case vmIntrinsics::_linkToVirtual:
1425 case vmIntrinsics::_linkToInterface:
1426 case vmIntrinsics::_linkToSpecial: {
1427 if (target->is_static()) {
1428 return false;
1429 }
1430 if (linker_sig->type_at(0)->is_primitive_type()) {
1431 return false; // receiver should be an oop
1432 }
1433 sbase = 1; // skip receiver
1434 break;
1435 }
1436 case vmIntrinsics::_linkToStatic: {
1437 if (!target->is_static()) {
1438 return false;
1439 }
1440 break;
1441 }
1442 case vmIntrinsics::_invokeBasic: {
1443 if (target->is_static()) {
1444 if (target_sig->type_at(0)->is_primitive_type()) {
1445 return false; // receiver should be an oop
1446 }
1447 rbase = 1; // skip receiver
1448 }
1449 break;
1450 }
1451 default:
1452 break;
1453 }
1454 assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1455 int arg_count = target_sig->count() - rbase;
1456 for (int i = 0; i < arg_count; i++) {
1457 if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1458 return false;
1459 }
1460 }
1461 // Only check the return type if the symbolic info has non-void return type.
1462 // I.e. the return value of the resolved method can be dropped.
1463 if (!linker->return_type()->is_void() &&
1464 !basic_types_match(linker->return_type(), target->return_type())) {
1465 return false;
1466 }
1467 return true; // no mismatch found
1468 }
1469
1470 // ------------------------------------------------------------------