1 /*
2 * Copyright (c) 1999, 2023, 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/compilerDefinitions.inline.hpp"
39 #include "compiler/methodLiveness.hpp"
40 #include "interpreter/interpreter.hpp"
41 #include "interpreter/linkResolver.hpp"
42 #include "interpreter/oopMapCache.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "oops/generateOopMap.hpp"
48 #include "oops/method.inline.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/methodHandles.hpp"
51 #include "runtime/deoptimization.hpp"
52 #include "runtime/handles.inline.hpp"
53 #include "utilities/bitMap.inline.hpp"
54 #include "utilities/xmlstream.hpp"
55 #ifdef COMPILER2
56 #include "ci/bcEscapeAnalyzer.hpp"
57 #include "ci/ciTypeFlow.hpp"
58 #include "oops/method.hpp"
59 #endif
60
61 // ciMethod
62 //
63 // This class represents a Method* in the HotSpot virtual
64 // machine.
65
66
67 // ------------------------------------------------------------------
68 // ciMethod::ciMethod
69 //
70 // Loaded method.
71 ciMethod::ciMethod(const methodHandle& h_m, ciInstanceKlass* holder) :
72 ciMetadata(h_m()),
73 _holder(holder)
74 {
75 assert(h_m() != nullptr, "no null method");
76 assert(_holder->get_instanceKlass() == h_m->method_holder(), "");
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 _handler_count = h_m->exception_table_length();
86 _size_of_parameters = h_m->size_of_parameters();
87 _uses_monitors = h_m->access_flags().has_monitor_bytecodes();
88 _balanced_monitors = !_uses_monitors || h_m->access_flags().is_monitor_matching();
89 _is_c1_compilable = !h_m->is_not_c1_compilable();
90 _is_c2_compilable = !h_m->is_not_c2_compilable();
91 _can_be_parsed = true;
92 _has_reserved_stack_access = h_m->has_reserved_stack_access();
93 _is_overpass = h_m->is_overpass();
94 // Lazy fields, filled in on demand. Require allocation.
95 _code = nullptr;
96 _exception_handlers = nullptr;
97 _liveness = nullptr;
98 _method_blocks = nullptr;
99 #if defined(COMPILER2)
100 _flow = nullptr;
101 _bcea = nullptr;
102 #endif // COMPILER2
103
104 // Check for blackhole intrinsic and then populate the intrinsic ID.
105 CompilerOracle::tag_blackhole_if_possible(h_m);
106 _intrinsic_id = h_m->intrinsic_id();
107
108 ciEnv *env = CURRENT_ENV;
109 if (env->jvmti_can_hotswap_or_post_breakpoint()) {
110 // 6328518 check hotswap conditions under the right lock.
111 MutexLocker locker(Compile_lock);
112 if (Dependencies::check_evol_method(h_m()) != nullptr) {
113 _is_c1_compilable = false;
114 _is_c2_compilable = false;
115 _can_be_parsed = false;
116 }
117 } else {
118 DEBUG_ONLY(CompilerThread::current()->check_possible_safepoint());
119 }
120
121 if (h_m->method_holder()->is_linked()) {
122 _can_be_statically_bound = h_m->can_be_statically_bound();
123 _can_omit_stack_trace = h_m->can_omit_stack_trace();
124 } else {
125 // Have to use a conservative value in this case.
126 _can_be_statically_bound = false;
127 _can_omit_stack_trace = true;
128 }
129
130 // Adjust the definition of this condition to be more useful:
131 // %%% take these conditions into account in vtable generation
132 if (!_can_be_statically_bound && h_m->is_private())
133 _can_be_statically_bound = true;
134 if (_can_be_statically_bound && h_m->is_abstract())
135 _can_be_statically_bound = false;
136
137 // generating _signature may allow GC and therefore move m.
138 // These fields are always filled in.
139 _name = env->get_symbol(h_m->name());
140 ciSymbol* sig_symbol = env->get_symbol(h_m->signature());
141 constantPoolHandle cpool(Thread::current(), h_m->constants());
142 _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
143 _method_data = nullptr;
144 // Take a snapshot of these values, so they will be commensurate with the MDO.
145 if (ProfileInterpreter || CompilerConfig::is_c1_profiling()) {
146 int invcnt = h_m->interpreter_invocation_count();
147 // if the value overflowed report it as max int
148 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
149 _interpreter_throwout_count = h_m->interpreter_throwout_count();
150 } else {
151 _interpreter_invocation_count = 0;
152 _interpreter_throwout_count = 0;
153 }
154 if (_interpreter_invocation_count == 0)
155 _interpreter_invocation_count = 1;
156 _inline_instructions_size = -1;
157 if (ReplayCompiles) {
158 ciReplay::initialize(this);
159 }
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*)nullptr),
172 _name( name),
173 _holder( holder),
174 _method_data( nullptr),
175 _method_blocks( nullptr),
176 _intrinsic_id( vmIntrinsics::_none),
177 _inline_instructions_size(-1),
178 _can_be_statically_bound(false),
179 _can_omit_stack_trace(true),
180 _liveness( nullptr)
181 #if defined(COMPILER2)
182 ,
183 _flow( nullptr),
184 _bcea( nullptr)
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 != nullptr; 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 == nullptr) {
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 nullptr;
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 nullptr;
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 == nullptr) {
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 == nullptr) {
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() != nullptr && method_data()->is_mature()) {
463 ciProfileData* data = method_data()->bci_to_data(bci);
464 if (data != nullptr && 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 == nullptr) 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 == nullptr) 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() != nullptr && method_data()->is_mature()) {
576 ciProfileData* data = method_data()->bci_to_data(bci);
577 if (data != nullptr) {
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() != nullptr && method_data()->is_mature()) {
614 ciProfileData* data = method_data()->bci_to_data(bci);
615 if (data != nullptr) {
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() != nullptr && method_data()->is_mature()) {
649 ciParametersTypeData* parameters = method_data()->parameters_type_data();
650 if (parameters != nullptr && 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
660 // ------------------------------------------------------------------
661 // ciMethod::find_monomorphic_target
662 //
663 // Given a certain calling environment, find the monomorphic target
664 // for the call. Return null if the call is not monomorphic in
665 // its calling environment, or if there are only abstract methods.
666 // The returned method is never abstract.
667 // Note: If caller uses a non-null result, it must inform dependencies
668 // via assert_unique_concrete_method or assert_leaf_type.
669 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
670 ciInstanceKlass* callee_holder,
671 ciInstanceKlass* actual_recv,
672 bool check_access) {
673 check_is_loaded();
674
675 if (actual_recv->is_interface()) {
676 // %%% We cannot trust interface types, yet. See bug 6312651.
677 return nullptr;
678 }
679
680 ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access, true /* allow_abstract */);
681 if (root_m == nullptr) {
682 // Something went wrong looking up the actual receiver method.
683 return nullptr;
684 }
685
686 // Make certain quick checks even if UseCHA is false.
687
688 // Is it private or final?
689 if (root_m->can_be_statically_bound()) {
690 assert(!root_m->is_abstract(), "sanity");
691 return root_m;
692 }
693
694 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
695 // Easy case. There is no other place to put a method, so don't bother
696 // to go through the VM_ENTRY_MARK and all the rest.
697 if (root_m->is_abstract()) {
698 return nullptr;
699 }
700 return root_m;
701 }
702
703 // Array methods (clone, hashCode, etc.) are always statically bound.
704 // If we were to see an array type here, we'd return root_m.
705 // However, this method processes only ciInstanceKlasses. (See 4962591.)
706 // The inline_native_clone intrinsic narrows Object to T[] properly,
707 // so there is no need to do the same job here.
708
709 if (!UseCHA) return nullptr;
710
711 VM_ENTRY_MARK;
712
713 methodHandle target;
714 {
715 MutexLocker locker(Compile_lock);
716 InstanceKlass* context = actual_recv->get_instanceKlass();
717 if (UseVtableBasedCHA) {
718 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context,
719 root_m->get_Method(),
720 callee_holder->get_Klass(),
721 this->get_Method()));
722 } else {
723 if (root_m->is_abstract()) {
724 return nullptr; // not supported
725 }
726 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context, root_m->get_Method()));
727 }
728 assert(target() == nullptr || !target()->is_abstract(), "not allowed");
729 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
730 }
731
732 #ifndef PRODUCT
733 LogTarget(Debug, dependencies) lt;
734 if (lt.is_enabled() && target() != nullptr && target() != root_m->get_Method()) {
735 LogStream ls(<);
736 ls.print("found a non-root unique target method");
737 ls.print_cr(" context = %s", actual_recv->get_Klass()->external_name());
738 ls.print(" method = ");
739 target->print_short_name(&ls);
740 ls.cr();
741 }
742 #endif //PRODUCT
743
744 if (target() == nullptr) {
745 return nullptr;
746 }
747 if (target() == root_m->get_Method()) {
748 return root_m;
749 }
750 if (!root_m->is_public() &&
751 !root_m->is_protected()) {
752 // If we are going to reason about inheritance, it's easiest
753 // if the method in question is public, protected, or private.
754 // If the answer is not root_m, it is conservatively correct
755 // to return null, even if the CHA encountered irrelevant
756 // methods in other packages.
757 // %%% TO DO: Work out logic for package-private methods
758 // with the same name but different vtable indexes.
759 return nullptr;
760 }
761 return CURRENT_THREAD_ENV->get_method(target());
762 }
763
764 // ------------------------------------------------------------------
765 // ciMethod::can_be_statically_bound
766 //
767 // Tries to determine whether a method can be statically bound in some context.
768 bool ciMethod::can_be_statically_bound(ciInstanceKlass* context) const {
769 return (holder() == context) && can_be_statically_bound();
770 }
771
772 // ------------------------------------------------------------------
773 // ciMethod::can_omit_stack_trace
774 //
775 // Tries to determine whether a method can omit stack trace in throw in compiled code.
776 bool ciMethod::can_omit_stack_trace() const {
777 if (!StackTraceInThrowable) {
778 return true; // stack trace is switched off.
779 }
780 if (!OmitStackTraceInFastThrow) {
781 return false; // Have to provide stack trace.
782 }
783 return _can_omit_stack_trace;
784 }
785
786 // ------------------------------------------------------------------
787 // ciMethod::resolve_invoke
788 //
789 // Given a known receiver klass, find the target for the call.
790 // Return null if the call has no target or the target is abstract.
791 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access, bool allow_abstract) {
792 check_is_loaded();
793 VM_ENTRY_MARK;
794
795 Klass* caller_klass = caller->get_Klass();
796 Klass* recv = exact_receiver->get_Klass();
797 Klass* resolved = holder()->get_Klass();
798 Symbol* h_name = name()->get_symbol();
799 Symbol* h_signature = signature()->get_symbol();
800
801 LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
802 check_access ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
803 check_access ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
804 Method* m = nullptr;
805 // Only do exact lookup if receiver klass has been linked. Otherwise,
806 // the vtable has not been setup, and the LinkResolver will fail.
807 if (recv->is_array_klass()
808 ||
809 (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
810 if (holder()->is_interface()) {
811 m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
812 } else {
813 m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
814 }
815 }
816
817 if (m == nullptr) {
818 // Return null only if there was a problem with lookup (uninitialized class, etc.)
819 return nullptr;
820 }
821
822 ciMethod* result = this;
823 if (m != get_Method()) {
824 result = CURRENT_THREAD_ENV->get_method(m);
825 }
826
827 if (result->is_abstract() && !allow_abstract) {
828 // Don't return abstract methods because they aren't optimizable or interesting.
829 return nullptr;
830 }
831 return result;
832 }
833
834 // ------------------------------------------------------------------
835 // ciMethod::resolve_vtable_index
836 //
837 // Given a known receiver klass, find the vtable index for the call.
838 // Return Method::invalid_vtable_index if the vtable_index is unknown.
839 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
840 check_is_loaded();
841
842 int vtable_index = Method::invalid_vtable_index;
843 // Only do lookup if receiver klass has been linked. Otherwise,
844 // the vtable has not been setup, and the LinkResolver will fail.
845 if (!receiver->is_interface()
846 && (!receiver->is_instance_klass() ||
847 receiver->as_instance_klass()->is_linked())) {
848 VM_ENTRY_MARK;
849
850 Klass* caller_klass = caller->get_Klass();
851 Klass* recv = receiver->get_Klass();
852 Symbol* h_name = name()->get_symbol();
853 Symbol* h_signature = signature()->get_symbol();
854
855 LinkInfo link_info(recv, h_name, h_signature, caller_klass);
856 vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
857 if (vtable_index == Method::nonvirtual_vtable_index) {
858 // A statically bound method. Return "no such index".
859 vtable_index = Method::invalid_vtable_index;
860 }
861 }
862
863 return vtable_index;
864 }
865
866 // ------------------------------------------------------------------
867 // ciMethod::get_field_at_bci
868 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
869 ciBytecodeStream iter(this);
870 iter.reset_to_bci(bci);
871 iter.next();
872 return iter.get_field(will_link);
873 }
874
875 // ------------------------------------------------------------------
876 // ciMethod::get_method_at_bci
877 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
878 ciBytecodeStream iter(this);
879 iter.reset_to_bci(bci);
880 iter.next();
881 return iter.get_method(will_link, declared_signature);
882 }
883
884 // ------------------------------------------------------------------
885 ciKlass* ciMethod::get_declared_method_holder_at_bci(int bci) {
886 ciBytecodeStream iter(this);
887 iter.reset_to_bci(bci);
888 iter.next();
889 return iter.get_declared_method_holder();
890 }
891
892 // ------------------------------------------------------------------
893 // Adjust a CounterData count to be commensurate with
894 // interpreter_invocation_count. If the MDO exists for
895 // only 25% of the time the method exists, then the
896 // counts in the MDO should be scaled by 4X, so that
897 // they can be usefully and stably compared against the
898 // invocation counts in methods.
899 int ciMethod::scale_count(int count, float prof_factor) {
900 if (count > 0 && method_data() != nullptr) {
901 int counter_life = method_data()->invocation_count();
902 int method_life = interpreter_invocation_count();
903 if (method_life < counter_life) { // may happen because of the snapshot timing
904 method_life = counter_life;
905 }
906 if (counter_life > 0) {
907 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
908 count = (count > 0) ? count : 1;
909 } else {
910 count = 1;
911 }
912 }
913 return count;
914 }
915
916
917 // ------------------------------------------------------------------
918 // ciMethod::is_special_get_caller_class_method
919 //
920 bool ciMethod::is_ignored_by_security_stack_walk() const {
921 check_is_loaded();
922 VM_ENTRY_MARK;
923 return get_Method()->is_ignored_by_security_stack_walk();
924 }
925
926 // ------------------------------------------------------------------
927 // ciMethod::needs_clinit_barrier
928 //
929 bool ciMethod::needs_clinit_barrier() const {
930 check_is_loaded();
931 return is_static() && !holder()->is_initialized();
932 }
933
934 // ------------------------------------------------------------------
935 // invokedynamic support
936
937 // ------------------------------------------------------------------
938 // ciMethod::is_method_handle_intrinsic
939 //
940 // Return true if the method is an instance of the JVM-generated
941 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
942 bool ciMethod::is_method_handle_intrinsic() const {
943 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
944 return (MethodHandles::is_signature_polymorphic(iid) &&
945 MethodHandles::is_signature_polymorphic_intrinsic(iid));
946 }
947
948 // ------------------------------------------------------------------
949 // ciMethod::is_compiled_lambda_form
950 //
951 // Return true if the method is a generated MethodHandle adapter.
952 // These are built by Java code.
953 bool ciMethod::is_compiled_lambda_form() const {
954 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
955 return iid == vmIntrinsics::_compiledLambdaForm;
956 }
957
958 // ------------------------------------------------------------------
959 // ciMethod::is_object_initializer
960 //
961 bool ciMethod::is_object_initializer() const {
962 return name() == ciSymbols::object_initializer_name();
963 }
964
965 // ------------------------------------------------------------------
966 // ciMethod::has_member_arg
967 //
968 // Return true if the method is a linker intrinsic like _linkToVirtual.
969 // These are built by the JVM.
970 bool ciMethod::has_member_arg() const {
971 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
972 return (MethodHandles::is_signature_polymorphic(iid) &&
973 MethodHandles::has_member_arg(iid));
974 }
975
976 // ------------------------------------------------------------------
977 // ciMethod::ensure_method_data
978 //
979 // Generate new MethodData* objects at compile time.
980 // Return true if allocation was successful or no MDO is required.
981 bool ciMethod::ensure_method_data(const methodHandle& h_m) {
982 EXCEPTION_CONTEXT;
983 if (is_native() || is_abstract() || h_m()->is_accessor()) {
984 return true;
985 }
986 if (h_m()->method_data() == nullptr) {
987 Method::build_profiling_method_data(h_m, THREAD);
988 if (HAS_PENDING_EXCEPTION) {
989 CLEAR_PENDING_EXCEPTION;
990 }
991 }
992 if (h_m()->method_data() != nullptr) {
993 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
994 return _method_data->load_data();
995 } else {
996 _method_data = CURRENT_ENV->get_empty_methodData();
997 return false;
998 }
999 }
1000
1001 // public, retroactive version
1002 bool ciMethod::ensure_method_data() {
1003 bool result = true;
1004 if (_method_data == nullptr || _method_data->is_empty()) {
1005 GUARDED_VM_ENTRY({
1006 methodHandle mh(Thread::current(), get_Method());
1007 result = ensure_method_data(mh);
1008 });
1009 }
1010 return result;
1011 }
1012
1013
1014 // ------------------------------------------------------------------
1015 // ciMethod::method_data
1016 //
1017 ciMethodData* ciMethod::method_data() {
1018 if (_method_data != nullptr) {
1019 return _method_data;
1020 }
1021 VM_ENTRY_MARK;
1022 ciEnv* env = CURRENT_ENV;
1023 Thread* my_thread = JavaThread::current();
1024 methodHandle h_m(my_thread, get_Method());
1025
1026 if (h_m()->method_data() != nullptr) {
1027 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1028 _method_data->load_data();
1029 } else {
1030 _method_data = CURRENT_ENV->get_empty_methodData();
1031 }
1032 return _method_data;
1033
1034 }
1035
1036 // ------------------------------------------------------------------
1037 // ciMethod::method_data_or_null
1038 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1039 // null otherwise.
1040 ciMethodData* ciMethod::method_data_or_null() {
1041 ciMethodData *md = method_data();
1042 if (md->is_empty()) {
1043 return nullptr;
1044 }
1045 return md;
1046 }
1047
1048 // ------------------------------------------------------------------
1049 // ciMethod::ensure_method_counters
1050 //
1051 MethodCounters* ciMethod::ensure_method_counters() {
1052 check_is_loaded();
1053 VM_ENTRY_MARK;
1054 methodHandle mh(THREAD, get_Method());
1055 MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1056 return method_counters;
1057 }
1058
1059 // ------------------------------------------------------------------
1060 // ciMethod::has_option
1061 //
1062 bool ciMethod::has_option(enum CompileCommand option) {
1063 check_is_loaded();
1064 VM_ENTRY_MARK;
1065 methodHandle mh(THREAD, get_Method());
1066 return CompilerOracle::has_option(mh, option);
1067 }
1068
1069 // ------------------------------------------------------------------
1070 // ciMethod::has_option_value
1071 //
1072 bool ciMethod::has_option_value(enum CompileCommand option, double& value) {
1073 check_is_loaded();
1074 VM_ENTRY_MARK;
1075 methodHandle mh(THREAD, get_Method());
1076 return CompilerOracle::has_option_value(mh, option, value);
1077 }
1078 // ------------------------------------------------------------------
1079 // ciMethod::can_be_compiled
1080 //
1081 // Have previous compilations of this method succeeded?
1082 bool ciMethod::can_be_compiled() {
1083 check_is_loaded();
1084 ciEnv* env = CURRENT_ENV;
1085 if (is_c1_compile(env->comp_level())) {
1086 return _is_c1_compilable;
1087 }
1088 return _is_c2_compilable;
1089 }
1090
1091 // ------------------------------------------------------------------
1092 // ciMethod::has_compiled_code
1093 bool ciMethod::has_compiled_code() {
1094 return inline_instructions_size() > 0;
1095 }
1096
1097 int ciMethod::highest_osr_comp_level() {
1098 check_is_loaded();
1099 VM_ENTRY_MARK;
1100 return get_Method()->highest_osr_comp_level();
1101 }
1102
1103 // ------------------------------------------------------------------
1104 // ciMethod::code_size_for_inlining
1105 //
1106 // Code size for inlining decisions. This method returns a code
1107 // size of 1 for methods which has the ForceInline annotation.
1108 int ciMethod::code_size_for_inlining() {
1109 check_is_loaded();
1110 if (get_Method()->force_inline()) {
1111 return 1;
1112 }
1113 return code_size();
1114 }
1115
1116 // ------------------------------------------------------------------
1117 // ciMethod::inline_instructions_size
1118 //
1119 // This is a rough metric for "fat" methods, compared before inlining
1120 // with InlineSmallCode. The CodeBlob::code_size accessor includes
1121 // junk like exception handler, stubs, and constant table, which are
1122 // not highly relevant to an inlined method. So we use the more
1123 // specific accessor nmethod::insts_size.
1124 // Also some instructions inside the code are excluded from inline
1125 // heuristic (e.g. post call nop instructions; see InlineSkippedInstructionsCounter)
1126 int ciMethod::inline_instructions_size() {
1127 if (_inline_instructions_size == -1) {
1128 GUARDED_VM_ENTRY(
1129 CompiledMethod* code = get_Method()->code();
1130 if (code != nullptr && (code->comp_level() == CompLevel_full_optimization)) {
1131 int isize = code->insts_end() - code->verified_entry_point() - code->skipped_instructions_size();
1132 _inline_instructions_size = isize > 0 ? isize : 0;
1133 } else {
1134 _inline_instructions_size = 0;
1135 }
1136 );
1137 }
1138 return _inline_instructions_size;
1139 }
1140
1141 // ------------------------------------------------------------------
1142 // ciMethod::log_nmethod_identity
1143 void ciMethod::log_nmethod_identity(xmlStream* log) {
1144 GUARDED_VM_ENTRY(
1145 CompiledMethod* code = get_Method()->code();
1146 if (code != nullptr) {
1147 code->log_identity(log);
1148 }
1149 )
1150 }
1151
1152 // ------------------------------------------------------------------
1153 // ciMethod::is_not_reached
1154 bool ciMethod::is_not_reached(int bci) {
1155 check_is_loaded();
1156 VM_ENTRY_MARK;
1157 return Interpreter::is_not_reached(
1158 methodHandle(THREAD, get_Method()), bci);
1159 }
1160
1161 // ------------------------------------------------------------------
1162 // ciMethod::was_never_executed
1163 bool ciMethod::was_executed_more_than(int times) {
1164 VM_ENTRY_MARK;
1165 return get_Method()->was_executed_more_than(times);
1166 }
1167
1168 // ------------------------------------------------------------------
1169 // ciMethod::has_unloaded_classes_in_signature
1170 bool ciMethod::has_unloaded_classes_in_signature() {
1171 // ciSignature is resolved against some accessing class and
1172 // signature classes aren't required to be local. As a benefit,
1173 // it makes signature classes visible through loader constraints.
1174 // So, encountering an unloaded class signals it is absent both in
1175 // the callee (local) and caller contexts.
1176 return signature()->has_unloaded_classes();
1177 }
1178
1179 // ------------------------------------------------------------------
1180 // ciMethod::is_klass_loaded
1181 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1182 VM_ENTRY_MARK;
1183 return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);
1184 }
1185
1186 // ------------------------------------------------------------------
1187 // ciMethod::check_call
1188 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1189 // This method is used only in C2 from InlineTree::ok_to_inline,
1190 // and is only used under -Xcomp.
1191 // It appears to fail when applied to an invokeinterface call site.
1192 // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1193 VM_ENTRY_MARK;
1194 {
1195 ExceptionMark em(THREAD);
1196 HandleMark hm(THREAD);
1197 constantPoolHandle pool (THREAD, get_Method()->constants());
1198 Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1199 Method* spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1200 if (HAS_PENDING_EXCEPTION) {
1201 CLEAR_PENDING_EXCEPTION;
1202 return false;
1203 } else {
1204 return (spec_method->is_static() == is_static);
1205 }
1206 }
1207 return false;
1208 }
1209 // ------------------------------------------------------------------
1210 // ciMethod::print_codes
1211 //
1212 // Print the bytecodes for this method.
1213 void ciMethod::print_codes_on(outputStream* st) {
1214 check_is_loaded();
1215 GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1216 }
1217
1218
1219 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1220 check_is_loaded(); \
1221 VM_ENTRY_MARK; \
1222 return get_Method()->flag_accessor(); \
1223 }
1224
1225 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1226 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1227 bool ciMethod::is_getter () const { FETCH_FLAG_FROM_VM(is_getter); }
1228 bool ciMethod::is_setter () const { FETCH_FLAG_FROM_VM(is_setter); }
1229 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1230 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); }
1231 bool ciMethod::is_empty () const { FETCH_FLAG_FROM_VM(is_empty_method); }
1232
1233 bool ciMethod::is_boxing_method() const {
1234 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1235 switch (intrinsic_id()) {
1236 case vmIntrinsics::_Boolean_valueOf:
1237 case vmIntrinsics::_Byte_valueOf:
1238 case vmIntrinsics::_Character_valueOf:
1239 case vmIntrinsics::_Short_valueOf:
1240 case vmIntrinsics::_Integer_valueOf:
1241 case vmIntrinsics::_Long_valueOf:
1242 case vmIntrinsics::_Float_valueOf:
1243 case vmIntrinsics::_Double_valueOf:
1244 return true;
1245 default:
1246 return false;
1247 }
1248 }
1249 return false;
1250 }
1251
1252 bool ciMethod::is_unboxing_method() const {
1253 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1254 switch (intrinsic_id()) {
1255 case vmIntrinsics::_booleanValue:
1256 case vmIntrinsics::_byteValue:
1257 case vmIntrinsics::_charValue:
1258 case vmIntrinsics::_shortValue:
1259 case vmIntrinsics::_intValue:
1260 case vmIntrinsics::_longValue:
1261 case vmIntrinsics::_floatValue:
1262 case vmIntrinsics::_doubleValue:
1263 return true;
1264 default:
1265 return false;
1266 }
1267 }
1268 return false;
1269 }
1270
1271 bool ciMethod::is_vector_method() const {
1272 return (holder() == ciEnv::current()->vector_VectorSupport_klass()) &&
1273 (intrinsic_id() != vmIntrinsics::_none);
1274 }
1275
1276 BCEscapeAnalyzer *ciMethod::get_bcea() {
1277 #ifdef COMPILER2
1278 if (_bcea == nullptr) {
1279 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, nullptr);
1280 }
1281 return _bcea;
1282 #else // COMPILER2
1283 ShouldNotReachHere();
1284 return nullptr;
1285 #endif // COMPILER2
1286 }
1287
1288 ciMethodBlocks *ciMethod::get_method_blocks() {
1289 if (_method_blocks == nullptr) {
1290 Arena *arena = CURRENT_ENV->arena();
1291 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1292 }
1293 return _method_blocks;
1294 }
1295
1296 #undef FETCH_FLAG_FROM_VM
1297
1298 void ciMethod::dump_name_as_ascii(outputStream* st, Method* method) {
1299 st->print("%s %s %s",
1300 CURRENT_ENV->replay_name(method->method_holder()),
1301 method->name()->as_quoted_ascii(),
1302 method->signature()->as_quoted_ascii());
1303 }
1304
1305 void ciMethod::dump_name_as_ascii(outputStream* st) {
1306 Method* method = get_Method();
1307 dump_name_as_ascii(st, method);
1308 }
1309
1310 void ciMethod::dump_replay_data(outputStream* st) {
1311 ResourceMark rm;
1312 Method* method = get_Method();
1313 if (MethodHandles::is_signature_polymorphic_method(method)) {
1314 // ignore for now
1315 return;
1316 }
1317 MethodCounters* mcs = method->method_counters();
1318 st->print("ciMethod ");
1319 dump_name_as_ascii(st);
1320 st->print_cr(" %d %d %d %d %d",
1321 mcs == nullptr ? 0 : mcs->invocation_counter()->raw_counter(),
1322 mcs == nullptr ? 0 : mcs->backedge_counter()->raw_counter(),
1323 interpreter_invocation_count(),
1324 interpreter_throwout_count(),
1325 _inline_instructions_size);
1326 }
1327
1328 // ------------------------------------------------------------------
1329 // ciMethod::print_codes
1330 //
1331 // Print a range of the bytecodes for this method.
1332 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1333 check_is_loaded();
1334 GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1335 }
1336
1337 // ------------------------------------------------------------------
1338 // ciMethod::print_name
1339 //
1340 // Print the name of this method, including signature and some flags.
1341 void ciMethod::print_name(outputStream* st) {
1342 check_is_loaded();
1343 GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1344 }
1345
1346 // ------------------------------------------------------------------
1347 // ciMethod::print_short_name
1348 //
1349 // Print the name of this method, without signature.
1350 void ciMethod::print_short_name(outputStream* st) {
1351 if (is_loaded()) {
1352 GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1353 } else {
1354 // Fall back if method is not loaded.
1355 holder()->print_name_on(st);
1356 st->print("::");
1357 name()->print_symbol_on(st);
1358 if (WizardMode)
1359 signature()->as_symbol()->print_symbol_on(st);
1360 }
1361 }
1362
1363 // ------------------------------------------------------------------
1364 // ciMethod::print_impl
1365 //
1366 // Implementation of the print method.
1367 void ciMethod::print_impl(outputStream* st) {
1368 ciMetadata::print_impl(st);
1369 st->print(" name=");
1370 name()->print_symbol_on(st);
1371 st->print(" holder=");
1372 holder()->print_name_on(st);
1373 st->print(" signature=");
1374 signature()->as_symbol()->print_symbol_on(st);
1375 if (is_loaded()) {
1376 st->print(" loaded=true");
1377 st->print(" arg_size=%d", arg_size());
1378 st->print(" flags=");
1379 flags().print_member_flags(st);
1380 } else {
1381 st->print(" loaded=false");
1382 }
1383 }
1384
1385 // ------------------------------------------------------------------
1386
1387 static BasicType erase_to_word_type(BasicType bt) {
1388 if (is_subword_type(bt)) return T_INT;
1389 if (is_reference_type(bt)) return T_OBJECT;
1390 return bt;
1391 }
1392
1393 static bool basic_types_match(ciType* t1, ciType* t2) {
1394 if (t1 == t2) return true;
1395 return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1396 }
1397
1398 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1399 bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1400 !resolved_method->is_method_handle_intrinsic();
1401
1402 if (!invoke_through_mh_intrinsic) {
1403 // Method name & descriptor should stay the same.
1404 // Signatures may reference unloaded types and thus they may be not strictly equal.
1405 ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1406 ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1407
1408 return (declared_method->name()->equals(resolved_method->name())) &&
1409 (declared_signature->equals(resolved_signature));
1410 }
1411
1412 ciMethod* linker = declared_method;
1413 ciMethod* target = resolved_method;
1414 // Linkers have appendix argument which is not passed to callee.
1415 int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1416 if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1417 return false; // argument slot count mismatch
1418 }
1419
1420 ciSignature* linker_sig = linker->signature();
1421 ciSignature* target_sig = target->signature();
1422
1423 if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1424 target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1425 return false; // argument count mismatch
1426 }
1427
1428 int sbase = 0, rbase = 0;
1429 switch (linker->intrinsic_id()) {
1430 case vmIntrinsics::_linkToVirtual:
1431 case vmIntrinsics::_linkToInterface:
1432 case vmIntrinsics::_linkToSpecial: {
1433 if (target->is_static()) {
1434 return false;
1435 }
1436 if (linker_sig->type_at(0)->is_primitive_type()) {
1437 return false; // receiver should be an oop
1438 }
1439 sbase = 1; // skip receiver
1440 break;
1441 }
1442 case vmIntrinsics::_linkToStatic: {
1443 if (!target->is_static()) {
1444 return false;
1445 }
1446 break;
1447 }
1448 case vmIntrinsics::_invokeBasic: {
1449 if (target->is_static()) {
1450 if (target_sig->type_at(0)->is_primitive_type()) {
1451 return false; // receiver should be an oop
1452 }
1453 rbase = 1; // skip receiver
1454 }
1455 break;
1456 }
1457 default:
1458 break;
1459 }
1460 assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1461 int arg_count = target_sig->count() - rbase;
1462 for (int i = 0; i < arg_count; i++) {
1463 if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1464 return false;
1465 }
1466 }
1467 // Only check the return type if the symbolic info has non-void return type.
1468 // I.e. the return value of the resolved method can be dropped.
1469 if (!linker->return_type()->is_void() &&
1470 !basic_types_match(linker->return_type(), target->return_type())) {
1471 return false;
1472 }
1473 return true; // no mismatch found
1474 }
1475
1476 // ------------------------------------------------------------------