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 "runtime/sharedRuntime.hpp"
51 #include "utilities/bitMap.inline.hpp"
52 #include "utilities/xmlstream.hpp"
53 #ifdef COMPILER2
54 #include "ci/bcEscapeAnalyzer.hpp"
55 #include "ci/ciTypeFlow.hpp"
56 #include "oops/method.hpp"
57 #endif
58
59 // ciMethod
60 //
61 // This class represents a Method* in the HotSpot virtual
62 // machine.
63
64
65 // ------------------------------------------------------------------
66 // ciMethod::ciMethod
67 //
68 // Loaded method.
69 ciMethod::ciMethod(const methodHandle& h_m, ciInstanceKlass* holder) :
70 ciMetadata(h_m()),
71 _holder(holder)
72 {
73 assert(h_m() != NULL, "no null method");
74 assert(_holder->get_instanceKlass() == h_m->method_holder(), "");
75
76 if (LogTouchedMethods) {
77 h_m->log_touched(Thread::current());
78 }
79 // These fields are always filled in in loaded methods.
80 _flags = ciFlags(h_m->access_flags());
81
82 // Easy to compute, so fill them in now.
83 _max_stack = h_m->max_stack();
84 _max_locals = h_m->max_locals();
85 _code_size = h_m->code_size();
86 _intrinsic_id = h_m->intrinsic_id();
87 _handler_count = h_m->exception_table_length();
88 _size_of_parameters = h_m->size_of_parameters();
89 _uses_monitors = h_m->access_flags().has_monitor_bytecodes();
90 _balanced_monitors = !_uses_monitors || h_m->access_flags().is_monitor_matching();
91 _is_c1_compilable = !h_m->is_not_c1_compilable();
92 _is_c2_compilable = !h_m->is_not_c2_compilable();
93 _can_be_parsed = true;
94 _has_reserved_stack_access = h_m->has_reserved_stack_access();
95 _is_overpass = h_m->is_overpass();
96 // Lazy fields, filled in on demand. Require allocation.
97 _code = NULL;
98 _exception_handlers = NULL;
99 _liveness = NULL;
100 _method_blocks = NULL;
101 #if defined(COMPILER2)
102 _flow = NULL;
103 _bcea = NULL;
104 #endif // COMPILER2
105
106 ciEnv *env = CURRENT_ENV;
107 if (env->jvmti_can_hotswap_or_post_breakpoint()) {
108 // 6328518 check hotswap conditions under the right lock.
109 MutexLocker locker(Compile_lock);
110 if (Dependencies::check_evol_method(h_m()) != NULL) {
111 _is_c1_compilable = false;
112 _is_c2_compilable = false;
113 _can_be_parsed = false;
114 }
115 } else {
116 DEBUG_ONLY(CompilerThread::current()->check_possible_safepoint());
117 }
118
119 if (h_m->method_holder()->is_linked()) {
120 _can_be_statically_bound = h_m->can_be_statically_bound();
121 } else {
122 // Have to use a conservative value in this case.
123 _can_be_statically_bound = false;
124 }
125
126 // Adjust the definition of this condition to be more useful:
127 // %%% take these conditions into account in vtable generation
128 if (!_can_be_statically_bound && h_m->is_private())
129 _can_be_statically_bound = true;
130 if (_can_be_statically_bound && h_m->is_abstract())
131 _can_be_statically_bound = false;
132
133 // generating _signature may allow GC and therefore move m.
134 // These fields are always filled in.
135 _name = env->get_symbol(h_m->name());
136 ciSymbol* sig_symbol = env->get_symbol(h_m->signature());
137 constantPoolHandle cpool(Thread::current(), h_m->constants());
138 _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
139 _method_data = NULL;
140 _nmethod_age = h_m->nmethod_age();
141 // Take a snapshot of these values, so they will be commensurate with the MDO.
142 if (ProfileInterpreter || CompilerConfig::is_c1_profiling()) {
143 int invcnt = h_m->interpreter_invocation_count();
144 // if the value overflowed report it as max int
145 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
146 _interpreter_throwout_count = h_m->interpreter_throwout_count();
147 } else {
148 _interpreter_invocation_count = 0;
149 _interpreter_throwout_count = 0;
150 }
151 if (_interpreter_invocation_count == 0)
152 _interpreter_invocation_count = 1;
153 _instructions_size = -1;
154 #ifdef ASSERT
155 if (ReplayCompiles) {
156 ciReplay::initialize(this);
157 }
158 #endif
159
160 CompilerOracle::tag_blackhole_if_possible(h_m);
161 }
162
163
164 // ------------------------------------------------------------------
165 // ciMethod::ciMethod
166 //
167 // Unloaded method.
168 ciMethod::ciMethod(ciInstanceKlass* holder,
169 ciSymbol* name,
170 ciSymbol* signature,
171 ciInstanceKlass* accessor) :
172 ciMetadata((Metadata*)NULL),
173 _name( name),
174 _holder( holder),
175 _method_data( NULL),
176 _method_blocks( NULL),
177 _intrinsic_id( vmIntrinsics::_none),
178 _instructions_size(-1),
179 _can_be_statically_bound(false),
180 _liveness( NULL)
181 #if defined(COMPILER2)
182 ,
183 _flow( NULL),
184 _bcea( NULL)
185 #endif // COMPILER2
186 {
187 // Usually holder and accessor are the same type but in some cases
188 // the holder has the wrong class loader (e.g. invokedynamic call
189 // sites) so we pass the accessor.
190 _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
191 }
192
193
194 // ------------------------------------------------------------------
195 // ciMethod::load_code
196 //
197 // Load the bytecodes and exception handler table for this method.
198 void ciMethod::load_code() {
199 VM_ENTRY_MARK;
200 assert(is_loaded(), "only loaded methods have code");
201
202 Method* me = get_Method();
203 Arena* arena = CURRENT_THREAD_ENV->arena();
204
205 // Load the bytecodes.
206 _code = (address)arena->Amalloc(code_size());
207 memcpy(_code, me->code_base(), code_size());
208
209 #if INCLUDE_JVMTI
210 // Revert any breakpoint bytecodes in ci's copy
211 if (me->number_of_breakpoints() > 0) {
212 BreakpointInfo* bp = me->method_holder()->breakpoints();
213 for (; bp != NULL; bp = bp->next()) {
214 if (bp->match(me)) {
215 code_at_put(bp->bci(), bp->orig_bytecode());
216 }
217 }
218 }
219 #endif
220
221 // And load the exception table.
222 ExceptionTable exc_table(me);
223
224 // Allocate one extra spot in our list of exceptions. This
225 // last entry will be used to represent the possibility that
226 // an exception escapes the method. See ciExceptionHandlerStream
227 // for details.
228 _exception_handlers =
229 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
230 * (_handler_count + 1));
231 if (_handler_count > 0) {
232 for (int i=0; i<_handler_count; i++) {
233 _exception_handlers[i] = new (arena) ciExceptionHandler(
234 holder(),
235 /* start */ exc_table.start_pc(i),
236 /* limit */ exc_table.end_pc(i),
237 /* goto pc */ exc_table.handler_pc(i),
238 /* cp index */ exc_table.catch_type_index(i));
239 }
240 }
241
242 // Put an entry at the end of our list to represent the possibility
243 // of exceptional exit.
244 _exception_handlers[_handler_count] =
245 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
246
247 if (CIPrintMethodCodes) {
248 print_codes();
249 }
250 }
251
252
253 // ------------------------------------------------------------------
254 // ciMethod::has_linenumber_table
255 //
256 // length unknown until decompression
257 bool ciMethod::has_linenumber_table() const {
258 check_is_loaded();
259 VM_ENTRY_MARK;
260 return get_Method()->has_linenumber_table();
261 }
262
263
264 // ------------------------------------------------------------------
265 // ciMethod::line_number_from_bci
266 int ciMethod::line_number_from_bci(int bci) const {
267 check_is_loaded();
268 VM_ENTRY_MARK;
269 return get_Method()->line_number_from_bci(bci);
270 }
271
272
273 // ------------------------------------------------------------------
274 // ciMethod::vtable_index
275 //
276 // Get the position of this method's entry in the vtable, if any.
277 int ciMethod::vtable_index() {
278 check_is_loaded();
279 assert(holder()->is_linked(), "must be linked");
280 VM_ENTRY_MARK;
281 return get_Method()->vtable_index();
282 }
283
284 // ------------------------------------------------------------------
285 // ciMethod::uses_balanced_monitors
286 //
287 // Does this method use monitors in a strict stack-disciplined manner?
288 bool ciMethod::has_balanced_monitors() {
289 check_is_loaded();
290 if (_balanced_monitors) return true;
291
292 // Analyze the method to see if monitors are used properly.
293 VM_ENTRY_MARK;
294 methodHandle method(THREAD, get_Method());
295 assert(method->has_monitor_bytecodes(), "should have checked this");
296
297 // Check to see if a previous compilation computed the
298 // monitor-matching analysis.
299 if (method->guaranteed_monitor_matching()) {
300 _balanced_monitors = true;
301 return true;
302 }
303
304 {
305 ExceptionMark em(THREAD);
306 ResourceMark rm(THREAD);
307 GeneratePairingInfo gpi(method);
308 if (!gpi.compute_map(THREAD)) {
309 fatal("Unrecoverable verification or out-of-memory error");
310 }
311 if (!gpi.monitor_safe()) {
312 return false;
313 }
314 method->set_guaranteed_monitor_matching();
315 _balanced_monitors = true;
316 }
317 return true;
318 }
319
320
321 // ------------------------------------------------------------------
322 // ciMethod::get_flow_analysis
323 ciTypeFlow* ciMethod::get_flow_analysis() {
324 #if defined(COMPILER2)
325 if (_flow == NULL) {
326 ciEnv* env = CURRENT_ENV;
327 _flow = new (env->arena()) ciTypeFlow(env, this);
328 _flow->do_flow();
329 }
330 return _flow;
331 #else // COMPILER2
332 ShouldNotReachHere();
333 return NULL;
334 #endif // COMPILER2
335 }
336
337
338 // ------------------------------------------------------------------
339 // ciMethod::get_osr_flow_analysis
340 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
341 #if defined(COMPILER2)
342 // OSR entry points are always place after a call bytecode of some sort
343 assert(osr_bci >= 0, "must supply valid OSR entry point");
344 ciEnv* env = CURRENT_ENV;
345 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
346 flow->do_flow();
347 return flow;
348 #else // COMPILER2
349 ShouldNotReachHere();
350 return NULL;
351 #endif // COMPILER2
352 }
353
354 // ------------------------------------------------------------------
355 // ciMethod::raw_liveness_at_bci
356 //
357 // Which local variables are live at a specific bci?
358 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
359 check_is_loaded();
360 if (_liveness == NULL) {
361 // Create the liveness analyzer.
362 Arena* arena = CURRENT_ENV->arena();
363 _liveness = new (arena) MethodLiveness(arena, this);
364 _liveness->compute_liveness();
365 }
366 return _liveness->get_liveness_at(bci);
367 }
368
369 // ------------------------------------------------------------------
370 // ciMethod::liveness_at_bci
371 //
372 // Which local variables are live at a specific bci? When debugging
373 // will return true for all locals in some cases to improve debug
374 // information.
375 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
376 if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot) {
377 // Keep all locals live for the user's edification and amusement.
378 MethodLivenessResult result(_max_locals);
379 result.set_range(0, _max_locals);
380 result.set_is_valid();
381 return result;
382 }
383 return raw_liveness_at_bci(bci);
384 }
385
386 // ciMethod::live_local_oops_at_bci
387 //
388 // find all the live oops in the locals array for a particular bci
389 // Compute what the interpreter believes by using the interpreter
390 // oopmap generator. This is used as a double check during osr to
391 // guard against conservative result from MethodLiveness making us
392 // think a dead oop is live. MethodLiveness is conservative in the
393 // sense that it may consider locals to be live which cannot be live,
394 // like in the case where a local could contain an oop or a primitive
395 // along different paths. In that case the local must be dead when
396 // those paths merge. Since the interpreter's viewpoint is used when
397 // gc'ing an interpreter frame we need to use its viewpoint during
398 // OSR when loading the locals.
399
400 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
401 VM_ENTRY_MARK;
402 InterpreterOopMap mask;
403 OopMapCache::compute_one_oop_map(methodHandle(THREAD, get_Method()), bci, &mask);
404 int mask_size = max_locals();
405 ResourceBitMap result(mask_size);
406 int i;
407 for (i = 0; i < mask_size ; i++ ) {
408 if (mask.is_oop(i)) result.set_bit(i);
409 }
410 return result;
411 }
412
413
414 #ifdef COMPILER1
415 // ------------------------------------------------------------------
416 // ciMethod::bci_block_start
417 //
418 // Marks all bcis where a new basic block starts
419 const BitMap& ciMethod::bci_block_start() {
420 check_is_loaded();
421 if (_liveness == NULL) {
422 // Create the liveness analyzer.
423 Arena* arena = CURRENT_ENV->arena();
424 _liveness = new (arena) MethodLiveness(arena, this);
425 _liveness->compute_liveness();
426 }
427
428 return _liveness->get_bci_block_start();
429 }
430 #endif // COMPILER1
431
432
433 // ------------------------------------------------------------------
434 // ciMethod::check_overflow
435 //
436 // Check whether the profile counter is overflowed and adjust if true.
437 // For invoke* it will turn negative values into max_jint,
438 // and for checkcast/aastore/instanceof turn positive values into min_jint.
439 int ciMethod::check_overflow(int c, Bytecodes::Code code) {
440 switch (code) {
441 case Bytecodes::_aastore: // fall-through
442 case Bytecodes::_checkcast: // fall-through
443 case Bytecodes::_instanceof: {
444 return (c > 0 ? min_jint : c); // always non-positive
445 }
446 default: {
447 assert(Bytecodes::is_invoke(code), "%s", Bytecodes::name(code));
448 return (c < 0 ? max_jint : c); // always non-negative
449 }
450 }
451 }
452
453
454 // ------------------------------------------------------------------
455 // ciMethod::call_profile_at_bci
456 //
457 // Get the ciCallProfile for the invocation of this method.
458 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
459 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
460 ResourceMark rm;
461 ciCallProfile result;
462 if (method_data() != NULL && method_data()->is_mature()) {
463 ciProfileData* data = method_data()->bci_to_data(bci);
464 if (data != NULL && data->is_CounterData()) {
465 // Every profiled call site has a counter.
466 int count = check_overflow(data->as_CounterData()->count(), java_code_at_bci(bci));
467
468 if (!data->is_ReceiverTypeData()) {
469 result._receiver_count[0] = 0; // that's a definite zero
470 } else { // ReceiverTypeData is a subclass of CounterData
471 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
472 // In addition, virtual call sites have receiver type information
473 int receivers_count_total = 0;
474 int morphism = 0;
475 // Precompute morphism for the possible fixup
476 for (uint i = 0; i < call->row_limit(); i++) {
477 ciKlass* receiver = call->receiver(i);
478 if (receiver == NULL) continue;
479 morphism++;
480 }
481 int epsilon = 0;
482 // For a call, it is assumed that either the type of the receiver(s)
483 // is recorded or an associated counter is incremented, but not both. With
484 // tiered compilation, however, both can happen due to the interpreter and
485 // C1 profiling invocations differently. Address that inconsistency here.
486 if (morphism == 1 && count > 0) {
487 epsilon = count;
488 count = 0;
489 }
490 for (uint i = 0; i < call->row_limit(); i++) {
491 ciKlass* receiver = call->receiver(i);
492 if (receiver == NULL) continue;
493 int rcount = saturated_add(call->receiver_count(i), epsilon);
494 if (rcount == 0) rcount = 1; // Should be valid value
495 receivers_count_total = saturated_add(receivers_count_total, rcount);
496 // Add the receiver to result data.
497 result.add_receiver(receiver, rcount);
498 // If we extend profiling to record methods,
499 // we will set result._method also.
500 }
501 // Determine call site's morphism.
502 // The call site count is 0 with known morphism (only 1 or 2 receivers)
503 // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
504 // The call site count is > 0 in the case of a polymorphic virtual call.
505 if (morphism > 0 && morphism == result._limit) {
506 // The morphism <= MorphismLimit.
507 if ((morphism < ciCallProfile::MorphismLimit) ||
508 (morphism == ciCallProfile::MorphismLimit && count == 0)) {
509 #ifdef ASSERT
510 if (count > 0) {
511 this->print_short_name(tty);
512 tty->print_cr(" @ bci:%d", bci);
513 this->print_codes();
514 assert(false, "this call site should not be polymorphic");
515 }
516 #endif
517 result._morphism = morphism;
518 }
519 }
520 // Make the count consistent if this is a call profile. If count is
521 // zero or less, presume that this is a typecheck profile and
522 // do nothing. Otherwise, increase count to be the sum of all
523 // receiver's counts.
524 if (count >= 0) {
525 count = saturated_add(count, receivers_count_total);
526 }
527 }
528 result._count = count;
529 }
530 }
531 return result;
532 }
533
534 // ------------------------------------------------------------------
535 // Add new receiver and sort data by receiver's profile count.
536 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
537 // Add new receiver and sort data by receiver's counts when we have space
538 // for it otherwise replace the less called receiver (less called receiver
539 // is placed to the last array element which is not used).
540 // First array's element contains most called receiver.
541 int i = _limit;
542 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
543 _receiver[i] = _receiver[i-1];
544 _receiver_count[i] = _receiver_count[i-1];
545 }
546 _receiver[i] = receiver;
547 _receiver_count[i] = receiver_count;
548 if (_limit < MorphismLimit) _limit++;
549 }
550
551
552 void ciMethod::assert_virtual_call_type_ok(int bci) {
553 assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
554 java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
555 }
556
557 void ciMethod::assert_call_type_ok(int bci) {
558 assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
559 java_code_at_bci(bci) == Bytecodes::_invokespecial ||
560 java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
561 }
562
563 /**
564 * Check whether profiling provides a type for the argument i to the
565 * call at bci bci
566 *
567 * @param [in]bci bci of the call
568 * @param [in]i argument number
569 * @param [out]type profiled type of argument, NULL if none
570 * @param [out]ptr_kind whether always null, never null or maybe null
571 * @return true if profiling exists
572 *
573 */
574 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
575 if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
576 ciProfileData* data = method_data()->bci_to_data(bci);
577 if (data != NULL) {
578 if (data->is_VirtualCallTypeData()) {
579 assert_virtual_call_type_ok(bci);
580 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
581 if (i >= call->number_of_arguments()) {
582 return false;
583 }
584 type = call->valid_argument_type(i);
585 ptr_kind = call->argument_ptr_kind(i);
586 return true;
587 } else if (data->is_CallTypeData()) {
588 assert_call_type_ok(bci);
589 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
590 if (i >= call->number_of_arguments()) {
591 return false;
592 }
593 type = call->valid_argument_type(i);
594 ptr_kind = call->argument_ptr_kind(i);
595 return true;
596 }
597 }
598 }
599 return false;
600 }
601
602 /**
603 * Check whether profiling provides a type for the return value from
604 * the call at bci bci
605 *
606 * @param [in]bci bci of the call
607 * @param [out]type profiled type of argument, NULL if none
608 * @param [out]ptr_kind whether always null, never null or maybe null
609 * @return true if profiling exists
610 *
611 */
612 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
613 if (MethodData::profile_return() && method_data() != NULL && method_data()->is_mature()) {
614 ciProfileData* data = method_data()->bci_to_data(bci);
615 if (data != NULL) {
616 if (data->is_VirtualCallTypeData()) {
617 assert_virtual_call_type_ok(bci);
618 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
619 if (call->has_return()) {
620 type = call->valid_return_type();
621 ptr_kind = call->return_ptr_kind();
622 return true;
623 }
624 } else if (data->is_CallTypeData()) {
625 assert_call_type_ok(bci);
626 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
627 if (call->has_return()) {
628 type = call->valid_return_type();
629 ptr_kind = call->return_ptr_kind();
630 }
631 return true;
632 }
633 }
634 }
635 return false;
636 }
637
638 /**
639 * Check whether profiling provides a type for the parameter i
640 *
641 * @param [in]i parameter number
642 * @param [out]type profiled type of parameter, NULL if none
643 * @param [out]ptr_kind whether always null, never null or maybe null
644 * @return true if profiling exists
645 *
646 */
647 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
648 if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
649 ciParametersTypeData* parameters = method_data()->parameters_type_data();
650 if (parameters != NULL && i < parameters->number_of_parameters()) {
651 type = parameters->valid_parameter_type(i);
652 ptr_kind = parameters->parameter_ptr_kind(i);
653 return true;
654 }
655 }
656 return false;
657 }
658
659 bool ciMethod::array_access_profiled_type(int bci, ciKlass*& array_type, ciKlass*& element_type, ProfilePtrKind& element_ptr, bool &flat_array, bool &null_free_array) {
660 if (method_data() != NULL && method_data()->is_mature()) {
661 ciProfileData* data = method_data()->bci_to_data(bci);
662 if (data != NULL && data->is_ArrayLoadStoreData()) {
663 ciArrayLoadStoreData* array_access = (ciArrayLoadStoreData*)data->as_ArrayLoadStoreData();
664 array_type = array_access->array()->valid_type();
665 element_type = array_access->element()->valid_type();
666 element_ptr = array_access->element()->ptr_kind();
667 flat_array = array_access->flat_array();
668 null_free_array = array_access->null_free_array();
669 return true;
670 }
671 }
672 return false;
673 }
674
675 bool ciMethod::acmp_profiled_type(int bci, ciKlass*& left_type, ciKlass*& right_type, ProfilePtrKind& left_ptr, ProfilePtrKind& right_ptr, bool &left_inline_type, bool &right_inline_type) {
676 if (method_data() != NULL && method_data()->is_mature()) {
677 ciProfileData* data = method_data()->bci_to_data(bci);
678 if (data != NULL && data->is_ACmpData()) {
679 ciACmpData* acmp = (ciACmpData*)data->as_ACmpData();
680 left_type = acmp->left()->valid_type();
681 right_type = acmp->right()->valid_type();
682 left_ptr = acmp->left()->ptr_kind();
683 right_ptr = acmp->right()->ptr_kind();
684 left_inline_type = acmp->left_inline_type();
685 right_inline_type = acmp->right_inline_type();
686 return true;
687 }
688 }
689 return false;
690 }
691
692
693 // ------------------------------------------------------------------
694 // ciMethod::find_monomorphic_target
695 //
696 // Given a certain calling environment, find the monomorphic target
697 // for the call. Return NULL if the call is not monomorphic in
698 // its calling environment, or if there are only abstract methods.
699 // The returned method is never abstract.
700 // Note: If caller uses a non-null result, it must inform dependencies
701 // via assert_unique_concrete_method or assert_leaf_type.
702 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
703 ciInstanceKlass* callee_holder,
704 ciInstanceKlass* actual_recv,
705 bool check_access) {
706 check_is_loaded();
707
708 if (actual_recv->is_interface()) {
709 // %%% We cannot trust interface types, yet. See bug 6312651.
710 return NULL;
711 }
712
713 ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access, true /* allow_abstract */);
714 if (root_m == NULL) {
715 // Something went wrong looking up the actual receiver method.
716 return NULL;
717 }
718
719 // Make certain quick checks even if UseCHA is false.
720
721 // Is it private or final?
722 if (root_m->can_be_statically_bound()) {
723 assert(!root_m->is_abstract(), "sanity");
724 return root_m;
725 }
726
727 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
728 // Easy case. There is no other place to put a method, so don't bother
729 // to go through the VM_ENTRY_MARK and all the rest.
730 if (root_m->is_abstract()) {
731 return NULL;
732 }
733 return root_m;
734 }
735
736 // Array methods (clone, hashCode, etc.) are always statically bound.
737 // If we were to see an array type here, we'd return root_m.
738 // However, this method processes only ciInstanceKlasses. (See 4962591.)
739 // The inline_native_clone intrinsic narrows Object to T[] properly,
740 // so there is no need to do the same job here.
741
742 if (!UseCHA) return NULL;
743
744 VM_ENTRY_MARK;
745
746 methodHandle target;
747 {
748 MutexLocker locker(Compile_lock);
749 InstanceKlass* context = actual_recv->get_instanceKlass();
750 if (UseVtableBasedCHA) {
751 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context,
752 root_m->get_Method(),
753 callee_holder->get_Klass(),
754 this->get_Method()));
755 } else {
756 if (root_m->is_abstract()) {
757 return NULL; // not supported
758 }
759 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context, root_m->get_Method()));
760 }
761 assert(target() == NULL || !target()->is_abstract(), "not allowed");
762 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
763 }
764
765 #ifndef PRODUCT
766 if (TraceDependencies && target() != NULL && target() != root_m->get_Method()) {
767 tty->print("found a non-root unique target method");
768 tty->print_cr(" context = %s", actual_recv->get_Klass()->external_name());
769 tty->print(" method = ");
770 target->print_short_name(tty);
771 tty->cr();
772 }
773 #endif //PRODUCT
774
775 if (target() == NULL) {
776 return NULL;
777 }
778 if (target() == root_m->get_Method()) {
779 return root_m;
780 }
781 if (!root_m->is_public() &&
782 !root_m->is_protected()) {
783 // If we are going to reason about inheritance, it's easiest
784 // if the method in question is public, protected, or private.
785 // If the answer is not root_m, it is conservatively correct
786 // to return NULL, even if the CHA encountered irrelevant
787 // methods in other packages.
788 // %%% TO DO: Work out logic for package-private methods
789 // with the same name but different vtable indexes.
790 return NULL;
791 }
792 return CURRENT_THREAD_ENV->get_method(target());
793 }
794
795 // ------------------------------------------------------------------
796 // ciMethod::can_be_statically_bound
797 //
798 // Tries to determine whether a method can be statically bound in some context.
799 bool ciMethod::can_be_statically_bound(ciInstanceKlass* context) const {
800 return (holder() == context) && can_be_statically_bound();
801 }
802
803 // ------------------------------------------------------------------
804 // ciMethod::resolve_invoke
805 //
806 // Given a known receiver klass, find the target for the call.
807 // Return NULL if the call has no target or the target is abstract.
808 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access, bool allow_abstract) {
809 check_is_loaded();
810 VM_ENTRY_MARK;
811
812 Klass* caller_klass = caller->get_Klass();
813 Klass* recv = exact_receiver->get_Klass();
814 Klass* resolved = holder()->get_Klass();
815 Symbol* h_name = name()->get_symbol();
816 Symbol* h_signature = signature()->get_symbol();
817
818 LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
819 check_access ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
820 check_access ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
821 Method* m = NULL;
822 // Only do exact lookup if receiver klass has been linked. Otherwise,
823 // the vtable has not been setup, and the LinkResolver will fail.
824 if (recv->is_array_klass()
825 ||
826 (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
827 if (holder()->is_interface()) {
828 m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
829 } else {
830 m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
831 }
832 }
833
834 if (m == NULL) {
835 // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
836 return NULL;
837 }
838
839 ciMethod* result = this;
840 if (m != get_Method()) {
841 result = CURRENT_THREAD_ENV->get_method(m);
842 }
843
844 if (result->is_abstract() && !allow_abstract) {
845 // Don't return abstract methods because they aren't optimizable or interesting.
846 return NULL;
847 }
848 return result;
849 }
850
851 // ------------------------------------------------------------------
852 // ciMethod::resolve_vtable_index
853 //
854 // Given a known receiver klass, find the vtable index for the call.
855 // Return Method::invalid_vtable_index if the vtable_index is unknown.
856 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
857 check_is_loaded();
858
859 int vtable_index = Method::invalid_vtable_index;
860 // Only do lookup if receiver klass has been linked. Otherwise,
861 // the vtable has not been setup, and the LinkResolver will fail.
862 if (!receiver->is_interface()
863 && (!receiver->is_instance_klass() ||
864 receiver->as_instance_klass()->is_linked())) {
865 VM_ENTRY_MARK;
866
867 Klass* caller_klass = caller->get_Klass();
868 Klass* recv = receiver->get_Klass();
869 Symbol* h_name = name()->get_symbol();
870 Symbol* h_signature = signature()->get_symbol();
871
872 LinkInfo link_info(recv, h_name, h_signature, caller_klass);
873 vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
874 if (vtable_index == Method::nonvirtual_vtable_index) {
875 // A statically bound method. Return "no such index".
876 vtable_index = Method::invalid_vtable_index;
877 }
878 }
879
880 return vtable_index;
881 }
882
883 // ------------------------------------------------------------------
884 // ciMethod::get_field_at_bci
885 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
886 ciBytecodeStream iter(this);
887 iter.reset_to_bci(bci);
888 iter.next();
889 return iter.get_field(will_link);
890 }
891
892 // ------------------------------------------------------------------
893 // ciMethod::get_method_at_bci
894 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
895 ciBytecodeStream iter(this);
896 iter.reset_to_bci(bci);
897 iter.next();
898 return iter.get_method(will_link, declared_signature);
899 }
900
901 // ------------------------------------------------------------------
902 ciKlass* ciMethod::get_declared_method_holder_at_bci(int bci) {
903 ciBytecodeStream iter(this);
904 iter.reset_to_bci(bci);
905 iter.next();
906 return iter.get_declared_method_holder();
907 }
908
909 // ------------------------------------------------------------------
910 // Adjust a CounterData count to be commensurate with
911 // interpreter_invocation_count. If the MDO exists for
912 // only 25% of the time the method exists, then the
913 // counts in the MDO should be scaled by 4X, so that
914 // they can be usefully and stably compared against the
915 // invocation counts in methods.
916 int ciMethod::scale_count(int count, float prof_factor) {
917 if (count > 0 && method_data() != NULL) {
918 int counter_life = method_data()->invocation_count();
919 int method_life = interpreter_invocation_count();
920 if (method_life < counter_life) { // may happen because of the snapshot timing
921 method_life = counter_life;
922 }
923 if (counter_life > 0) {
924 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
925 count = (count > 0) ? count : 1;
926 } else {
927 count = 1;
928 }
929 }
930 return count;
931 }
932
933
934 // ------------------------------------------------------------------
935 // ciMethod::is_special_get_caller_class_method
936 //
937 bool ciMethod::is_ignored_by_security_stack_walk() const {
938 check_is_loaded();
939 VM_ENTRY_MARK;
940 return get_Method()->is_ignored_by_security_stack_walk();
941 }
942
943 // ------------------------------------------------------------------
944 // ciMethod::needs_clinit_barrier
945 //
946 bool ciMethod::needs_clinit_barrier() const {
947 check_is_loaded();
948 return is_static() && !holder()->is_initialized();
949 }
950
951 // ------------------------------------------------------------------
952 // invokedynamic support
953
954 // ------------------------------------------------------------------
955 // ciMethod::is_method_handle_intrinsic
956 //
957 // Return true if the method is an instance of the JVM-generated
958 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
959 bool ciMethod::is_method_handle_intrinsic() const {
960 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
961 return (MethodHandles::is_signature_polymorphic(iid) &&
962 MethodHandles::is_signature_polymorphic_intrinsic(iid));
963 }
964
965 // ------------------------------------------------------------------
966 // ciMethod::is_compiled_lambda_form
967 //
968 // Return true if the method is a generated MethodHandle adapter.
969 // These are built by Java code.
970 bool ciMethod::is_compiled_lambda_form() const {
971 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
972 return iid == vmIntrinsics::_compiledLambdaForm;
973 }
974
975 // ------------------------------------------------------------------
976 // ciMethod::is_object_constructor
977 //
978 bool ciMethod::is_object_constructor() const {
979 return (name() == ciSymbols::object_initializer_name()
980 && signature()->return_type()->is_void());
981 // Note: We can't test is_static, because that would
982 // require the method to be loaded. Sometimes it isn't.
983 }
984
985 // ------------------------------------------------------------------
986 // ciMethod::is_static_init_factory
987 //
988 bool ciMethod::is_static_init_factory() const {
989 return (name() == ciSymbols::object_initializer_name()
990 && !signature()->return_type()->is_void());
991 // Note: We can't test is_static, because that would
992 // require the method to be loaded. Sometimes it isn't.
993 }
994
995 // ------------------------------------------------------------------
996 // ciMethod::has_member_arg
997 //
998 // Return true if the method is a linker intrinsic like _linkToVirtual.
999 // These are built by the JVM.
1000 bool ciMethod::has_member_arg() const {
1001 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
1002 return (MethodHandles::is_signature_polymorphic(iid) &&
1003 MethodHandles::has_member_arg(iid));
1004 }
1005
1006 // ------------------------------------------------------------------
1007 // ciMethod::ensure_method_data
1008 //
1009 // Generate new MethodData* objects at compile time.
1010 // Return true if allocation was successful or no MDO is required.
1011 bool ciMethod::ensure_method_data(const methodHandle& h_m) {
1012 EXCEPTION_CONTEXT;
1013 if (is_native() || is_abstract() || h_m()->is_accessor()) {
1014 return true;
1015 }
1016 if (h_m()->method_data() == NULL) {
1017 Method::build_interpreter_method_data(h_m, THREAD);
1018 if (HAS_PENDING_EXCEPTION) {
1019 CLEAR_PENDING_EXCEPTION;
1020 }
1021 }
1022 if (h_m()->method_data() != NULL) {
1023 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1024 return _method_data->load_data();
1025 } else {
1026 _method_data = CURRENT_ENV->get_empty_methodData();
1027 return false;
1028 }
1029 }
1030
1031 // public, retroactive version
1032 bool ciMethod::ensure_method_data() {
1033 bool result = true;
1034 if (_method_data == NULL || _method_data->is_empty()) {
1035 GUARDED_VM_ENTRY({
1036 methodHandle mh(Thread::current(), get_Method());
1037 result = ensure_method_data(mh);
1038 });
1039 }
1040 return result;
1041 }
1042
1043
1044 // ------------------------------------------------------------------
1045 // ciMethod::method_data
1046 //
1047 ciMethodData* ciMethod::method_data() {
1048 if (_method_data != NULL) {
1049 return _method_data;
1050 }
1051 VM_ENTRY_MARK;
1052 ciEnv* env = CURRENT_ENV;
1053 Thread* my_thread = JavaThread::current();
1054 methodHandle h_m(my_thread, get_Method());
1055
1056 if (h_m()->method_data() != NULL) {
1057 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1058 _method_data->load_data();
1059 } else {
1060 _method_data = CURRENT_ENV->get_empty_methodData();
1061 }
1062 return _method_data;
1063
1064 }
1065
1066 // ------------------------------------------------------------------
1067 // ciMethod::method_data_or_null
1068 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1069 // NULL otherwise.
1070 ciMethodData* ciMethod::method_data_or_null() {
1071 ciMethodData *md = method_data();
1072 if (md->is_empty()) {
1073 return NULL;
1074 }
1075 return md;
1076 }
1077
1078 // ------------------------------------------------------------------
1079 // ciMethod::ensure_method_counters
1080 //
1081 MethodCounters* ciMethod::ensure_method_counters() {
1082 check_is_loaded();
1083 VM_ENTRY_MARK;
1084 methodHandle mh(THREAD, get_Method());
1085 MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1086 return method_counters;
1087 }
1088
1089 // ------------------------------------------------------------------
1090 // ciMethod::has_option
1091 //
1092 bool ciMethod::has_option(enum CompileCommand option) {
1093 check_is_loaded();
1094 VM_ENTRY_MARK;
1095 methodHandle mh(THREAD, get_Method());
1096 return CompilerOracle::has_option(mh, option);
1097 }
1098
1099 // ------------------------------------------------------------------
1100 // ciMethod::has_option_value
1101 //
1102 bool ciMethod::has_option_value(enum CompileCommand option, double& value) {
1103 check_is_loaded();
1104 VM_ENTRY_MARK;
1105 methodHandle mh(THREAD, get_Method());
1106 return CompilerOracle::has_option_value(mh, option, value);
1107 }
1108 // ------------------------------------------------------------------
1109 // ciMethod::can_be_compiled
1110 //
1111 // Have previous compilations of this method succeeded?
1112 bool ciMethod::can_be_compiled() {
1113 check_is_loaded();
1114 ciEnv* env = CURRENT_ENV;
1115 if (is_c1_compile(env->comp_level())) {
1116 return _is_c1_compilable;
1117 }
1118 return _is_c2_compilable;
1119 }
1120
1121 // ------------------------------------------------------------------
1122 // ciMethod::has_compiled_code
1123 bool ciMethod::has_compiled_code() {
1124 return instructions_size() > 0;
1125 }
1126
1127 int ciMethod::highest_osr_comp_level() {
1128 check_is_loaded();
1129 VM_ENTRY_MARK;
1130 return get_Method()->highest_osr_comp_level();
1131 }
1132
1133 // ------------------------------------------------------------------
1134 // ciMethod::code_size_for_inlining
1135 //
1136 // Code size for inlining decisions. This method returns a code
1137 // size of 1 for methods which has the ForceInline annotation.
1138 int ciMethod::code_size_for_inlining() {
1139 check_is_loaded();
1140 if (get_Method()->force_inline()) {
1141 return 1;
1142 }
1143 return code_size();
1144 }
1145
1146 // ------------------------------------------------------------------
1147 // ciMethod::instructions_size
1148 //
1149 // This is a rough metric for "fat" methods, compared before inlining
1150 // with InlineSmallCode. The CodeBlob::code_size accessor includes
1151 // junk like exception handler, stubs, and constant table, which are
1152 // not highly relevant to an inlined method. So we use the more
1153 // specific accessor nmethod::insts_size.
1154 int ciMethod::instructions_size() {
1155 if (_instructions_size == -1) {
1156 GUARDED_VM_ENTRY(
1157 CompiledMethod* code = get_Method()->code();
1158 if (code != NULL && (code->comp_level() == CompLevel_full_optimization)) {
1159 _instructions_size = code->insts_end() - code->verified_entry_point();
1160 } else {
1161 _instructions_size = 0;
1162 }
1163 );
1164 }
1165 return _instructions_size;
1166 }
1167
1168 // ------------------------------------------------------------------
1169 // ciMethod::log_nmethod_identity
1170 void ciMethod::log_nmethod_identity(xmlStream* log) {
1171 GUARDED_VM_ENTRY(
1172 CompiledMethod* code = get_Method()->code();
1173 if (code != NULL) {
1174 code->log_identity(log);
1175 }
1176 )
1177 }
1178
1179 // ------------------------------------------------------------------
1180 // ciMethod::is_not_reached
1181 bool ciMethod::is_not_reached(int bci) {
1182 check_is_loaded();
1183 VM_ENTRY_MARK;
1184 return Interpreter::is_not_reached(
1185 methodHandle(THREAD, get_Method()), bci);
1186 }
1187
1188 // ------------------------------------------------------------------
1189 // ciMethod::was_never_executed
1190 bool ciMethod::was_executed_more_than(int times) {
1191 VM_ENTRY_MARK;
1192 return get_Method()->was_executed_more_than(times);
1193 }
1194
1195 // ------------------------------------------------------------------
1196 // ciMethod::has_unloaded_classes_in_signature
1197 bool ciMethod::has_unloaded_classes_in_signature() {
1198 VM_ENTRY_MARK;
1199 {
1200 ExceptionMark em(THREAD);
1201 methodHandle m(THREAD, get_Method());
1202 bool has_unloaded = Method::has_unloaded_classes_in_signature(m, thread);
1203 if( HAS_PENDING_EXCEPTION ) {
1204 CLEAR_PENDING_EXCEPTION;
1205 return true; // Declare that we may have unloaded classes
1206 }
1207 return has_unloaded;
1208 }
1209 }
1210
1211 // ------------------------------------------------------------------
1212 // ciMethod::is_klass_loaded
1213 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1214 VM_ENTRY_MARK;
1215 return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);
1216 }
1217
1218 // ------------------------------------------------------------------
1219 // ciMethod::check_call
1220 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1221 // This method is used only in C2 from InlineTree::ok_to_inline,
1222 // and is only used under -Xcomp.
1223 // It appears to fail when applied to an invokeinterface call site.
1224 // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1225 VM_ENTRY_MARK;
1226 {
1227 ExceptionMark em(THREAD);
1228 HandleMark hm(THREAD);
1229 constantPoolHandle pool (THREAD, get_Method()->constants());
1230 Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1231 Method* spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1232 if (HAS_PENDING_EXCEPTION) {
1233 CLEAR_PENDING_EXCEPTION;
1234 return false;
1235 } else {
1236 return (spec_method->is_static() == is_static);
1237 }
1238 }
1239 return false;
1240 }
1241
1242 // ------------------------------------------------------------------
1243 // ciMethod::profile_aging
1244 //
1245 // Should the method be compiled with an age counter?
1246 bool ciMethod::profile_aging() const {
1247 return UseCodeAging && (!MethodCounters::is_nmethod_hot(nmethod_age()) &&
1248 !MethodCounters::is_nmethod_age_unset(nmethod_age()));
1249 }
1250 // ------------------------------------------------------------------
1251 // ciMethod::print_codes
1252 //
1253 // Print the bytecodes for this method.
1254 void ciMethod::print_codes_on(outputStream* st) {
1255 check_is_loaded();
1256 GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1257 }
1258
1259
1260 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1261 check_is_loaded(); \
1262 VM_ENTRY_MARK; \
1263 return get_Method()->flag_accessor(); \
1264 }
1265
1266 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1267 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1268 bool ciMethod::is_getter () const { FETCH_FLAG_FROM_VM(is_getter); }
1269 bool ciMethod::is_setter () const { FETCH_FLAG_FROM_VM(is_setter); }
1270 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1271 bool ciMethod::is_object_constructor_or_class_initializer() const { FETCH_FLAG_FROM_VM(is_object_constructor_or_class_initializer); }
1272 bool ciMethod::is_empty () const { FETCH_FLAG_FROM_VM(is_empty_method); }
1273
1274 bool ciMethod::is_boxing_method() const {
1275 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1276 switch (intrinsic_id()) {
1277 case vmIntrinsics::_Boolean_valueOf:
1278 case vmIntrinsics::_Byte_valueOf:
1279 case vmIntrinsics::_Character_valueOf:
1280 case vmIntrinsics::_Short_valueOf:
1281 case vmIntrinsics::_Integer_valueOf:
1282 case vmIntrinsics::_Long_valueOf:
1283 case vmIntrinsics::_Float_valueOf:
1284 case vmIntrinsics::_Double_valueOf:
1285 return true;
1286 default:
1287 return false;
1288 }
1289 }
1290 return false;
1291 }
1292
1293 bool ciMethod::is_unboxing_method() const {
1294 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1295 switch (intrinsic_id()) {
1296 case vmIntrinsics::_booleanValue:
1297 case vmIntrinsics::_byteValue:
1298 case vmIntrinsics::_charValue:
1299 case vmIntrinsics::_shortValue:
1300 case vmIntrinsics::_intValue:
1301 case vmIntrinsics::_longValue:
1302 case vmIntrinsics::_floatValue:
1303 case vmIntrinsics::_doubleValue:
1304 return true;
1305 default:
1306 return false;
1307 }
1308 }
1309 return false;
1310 }
1311
1312 bool ciMethod::is_vector_method() const {
1313 return (holder() == ciEnv::current()->vector_VectorSupport_klass()) &&
1314 (intrinsic_id() != vmIntrinsics::_none);
1315 }
1316
1317 BCEscapeAnalyzer *ciMethod::get_bcea() {
1318 #ifdef COMPILER2
1319 if (_bcea == NULL) {
1320 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1321 }
1322 return _bcea;
1323 #else // COMPILER2
1324 ShouldNotReachHere();
1325 return NULL;
1326 #endif // COMPILER2
1327 }
1328
1329 ciMethodBlocks *ciMethod::get_method_blocks() {
1330 if (_method_blocks == NULL) {
1331 Arena *arena = CURRENT_ENV->arena();
1332 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1333 }
1334 return _method_blocks;
1335 }
1336
1337 #undef FETCH_FLAG_FROM_VM
1338
1339 void ciMethod::dump_name_as_ascii(outputStream* st, Method* method) {
1340 st->print("%s %s %s",
1341 CURRENT_ENV->replay_name(method->method_holder()),
1342 method->name()->as_quoted_ascii(),
1343 method->signature()->as_quoted_ascii());
1344 }
1345
1346 void ciMethod::dump_name_as_ascii(outputStream* st) {
1347 Method* method = get_Method();
1348 dump_name_as_ascii(st, method);
1349 }
1350
1351 void ciMethod::dump_replay_data(outputStream* st) {
1352 ResourceMark rm;
1353 Method* method = get_Method();
1354 if (MethodHandles::is_signature_polymorphic_method(method)) {
1355 // ignore for now
1356 return;
1357 }
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 (is_reference_type(bt)) return T_OBJECT;
1431 if (bt == T_INLINE_TYPE) return T_OBJECT;
1432 return bt;
1433 }
1434
1435 static bool basic_types_match(ciType* t1, ciType* t2) {
1436 if (t1 == t2) return true;
1437 return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1438 }
1439
1440 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1441 bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1442 !resolved_method->is_method_handle_intrinsic();
1443
1444 if (!invoke_through_mh_intrinsic) {
1445 // Method name & descriptor should stay the same.
1446 // Signatures may reference unloaded types and thus they may be not strictly equal.
1447 ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1448 ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1449
1450 return (declared_method->name()->equals(resolved_method->name())) &&
1451 (declared_signature->equals(resolved_signature));
1452 }
1453
1454 ciMethod* linker = declared_method;
1455 ciMethod* target = resolved_method;
1456 // Linkers have appendix argument which is not passed to callee.
1457 int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1458 if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1459 return false; // argument slot count mismatch
1460 }
1461
1462 ciSignature* linker_sig = linker->signature();
1463 ciSignature* target_sig = target->signature();
1464
1465 if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1466 target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1467 return false; // argument count mismatch
1468 }
1469
1470 int sbase = 0, rbase = 0;
1471 switch (linker->intrinsic_id()) {
1472 case vmIntrinsics::_linkToVirtual:
1473 case vmIntrinsics::_linkToInterface:
1474 case vmIntrinsics::_linkToSpecial: {
1475 if (target->is_static()) {
1476 return false;
1477 }
1478 if (linker_sig->type_at(0)->is_primitive_type()) {
1479 return false; // receiver should be an oop
1480 }
1481 sbase = 1; // skip receiver
1482 break;
1483 }
1484 case vmIntrinsics::_linkToStatic: {
1485 if (!target->is_static()) {
1486 return false;
1487 }
1488 break;
1489 }
1490 case vmIntrinsics::_invokeBasic: {
1491 if (target->is_static()) {
1492 if (target_sig->type_at(0)->is_primitive_type()) {
1493 return false; // receiver should be an oop
1494 }
1495 rbase = 1; // skip receiver
1496 }
1497 break;
1498 }
1499 default:
1500 break;
1501 }
1502 assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1503 int arg_count = target_sig->count() - rbase;
1504 for (int i = 0; i < arg_count; i++) {
1505 if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1506 return false;
1507 }
1508 }
1509 // Only check the return type if the symbolic info has non-void return type.
1510 // I.e. the return value of the resolved method can be dropped.
1511 if (!linker->return_type()->is_void() &&
1512 !basic_types_match(linker->return_type(), target->return_type())) {
1513 return false;
1514 }
1515 return true; // no mismatch found
1516 }
1517
1518 // ------------------------------------------------------------------
1519
1520 bool ciMethod::has_scalarized_args() const {
1521 VM_ENTRY_MARK;
1522 return get_Method()->has_scalarized_args();
1523 }
1524
1525 const GrowableArray<SigEntry>* ciMethod::get_sig_cc() {
1526 VM_ENTRY_MARK;
1527 if (get_Method()->adapter() == NULL) {
1528 return NULL;
1529 }
1530 return get_Method()->adapter()->get_sig_cc();
1531 }