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 "runtime/sharedRuntime.hpp"
54 #include "utilities/bitMap.inline.hpp"
55 #include "utilities/xmlstream.hpp"
56 #ifdef COMPILER2
57 #include "ci/bcEscapeAnalyzer.hpp"
58 #include "ci/ciTypeFlow.hpp"
59 #include "oops/method.hpp"
60 #endif
61
62 // ciMethod
63 //
64 // This class represents a Method* in the HotSpot virtual
65 // machine.
66
67
68 // ------------------------------------------------------------------
69 // ciMethod::ciMethod
70 //
71 // Loaded method.
72 ciMethod::ciMethod(const methodHandle& h_m, ciInstanceKlass* holder) :
73 ciMetadata(h_m()),
74 _holder(holder)
75 {
76 assert(h_m() != nullptr, "no null method");
77 assert(_holder->get_instanceKlass() == h_m->method_holder(), "");
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 _handler_count = h_m->exception_table_length();
87 _size_of_parameters = h_m->size_of_parameters();
88 _uses_monitors = h_m->has_monitor_bytecodes();
89 _balanced_monitors = !_uses_monitors || h_m->guaranteed_monitor_matching();
90 _is_c1_compilable = !h_m->is_not_c1_compilable();
91 _is_c2_compilable = !h_m->is_not_c2_compilable();
92 _can_be_parsed = true;
93 _has_reserved_stack_access = h_m->has_reserved_stack_access();
94 _is_overpass = h_m->is_overpass();
95 // Lazy fields, filled in on demand. Require allocation.
96 _code = nullptr;
97 _exception_handlers = nullptr;
98 _liveness = nullptr;
99 _method_blocks = nullptr;
100 #if defined(COMPILER2)
101 _flow = nullptr;
102 _bcea = nullptr;
103 #endif // COMPILER2
104
105 // Check for blackhole intrinsic and then populate the intrinsic ID.
106 CompilerOracle::tag_blackhole_if_possible(h_m);
107 _intrinsic_id = h_m->intrinsic_id();
108
109 ciEnv *env = CURRENT_ENV;
110 if (env->jvmti_can_hotswap_or_post_breakpoint()) {
111 // 6328518 check hotswap conditions under the right lock.
112 MutexLocker locker(Compile_lock);
113 if (Dependencies::check_evol_method(h_m()) != nullptr) {
114 _is_c1_compilable = false;
115 _is_c2_compilable = false;
116 _can_be_parsed = false;
117 }
118 } else {
119 DEBUG_ONLY(CompilerThread::current()->check_possible_safepoint());
120 }
121
122 if (h_m->method_holder()->is_linked()) {
123 _can_be_statically_bound = h_m->can_be_statically_bound();
124 _can_omit_stack_trace = h_m->can_omit_stack_trace();
125 } else {
126 // Have to use a conservative value in this case.
127 _can_be_statically_bound = false;
128 _can_omit_stack_trace = true;
129 }
130
131 // Adjust the definition of this condition to be more useful:
132 // %%% take these conditions into account in vtable generation
133 if (!_can_be_statically_bound && h_m->is_private())
134 _can_be_statically_bound = true;
135 if (_can_be_statically_bound && h_m->is_abstract())
136 _can_be_statically_bound = false;
137
138 // generating _signature may allow GC and therefore move m.
139 // These fields are always filled in.
140 _name = env->get_symbol(h_m->name());
141 ciSymbol* sig_symbol = env->get_symbol(h_m->signature());
142 constantPoolHandle cpool(Thread::current(), h_m->constants());
143 _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
144 _method_data = nullptr;
145 // Take a snapshot of these values, so they will be commensurate with the MDO.
146 if (ProfileInterpreter || CompilerConfig::is_c1_profiling()) {
147 int invcnt = h_m->interpreter_invocation_count();
148 // if the value overflowed report it as max int
149 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
150 _interpreter_throwout_count = h_m->interpreter_throwout_count();
151 } else {
152 _interpreter_invocation_count = 0;
153 _interpreter_throwout_count = 0;
154 }
155 if (_interpreter_invocation_count == 0)
156 _interpreter_invocation_count = 1;
157 _inline_instructions_size = -1;
158 if (ReplayCompiles) {
159 ciReplay::initialize(this);
160 }
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*)nullptr),
173 _name( name),
174 _holder( holder),
175 _method_data( nullptr),
176 _method_blocks( nullptr),
177 _intrinsic_id( vmIntrinsics::_none),
178 _inline_instructions_size(-1),
179 _can_be_statically_bound(false),
180 _can_omit_stack_trace(true),
181 _liveness( nullptr)
182 #if defined(COMPILER2)
183 ,
184 _flow( nullptr),
185 _bcea( nullptr)
186 #endif // COMPILER2
187 {
188 // Usually holder and accessor are the same type but in some cases
189 // the holder has the wrong class loader (e.g. invokedynamic call
190 // sites) so we pass the accessor.
191 _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
192 }
193
194
195 // ------------------------------------------------------------------
196 // ciMethod::load_code
197 //
198 // Load the bytecodes and exception handler table for this method.
199 void ciMethod::load_code() {
200 VM_ENTRY_MARK;
201 assert(is_loaded(), "only loaded methods have code");
202
203 Method* me = get_Method();
204 Arena* arena = CURRENT_THREAD_ENV->arena();
205
206 // Load the bytecodes.
207 _code = (address)arena->Amalloc(code_size());
208 memcpy(_code, me->code_base(), code_size());
209
210 #if INCLUDE_JVMTI
211 // Revert any breakpoint bytecodes in ci's copy
212 if (me->number_of_breakpoints() > 0) {
213 BreakpointInfo* bp = me->method_holder()->breakpoints();
214 for (; bp != nullptr; bp = bp->next()) {
215 if (bp->match(me)) {
216 code_at_put(bp->bci(), bp->orig_bytecode());
217 }
218 }
219 }
220 #endif
221
222 // And load the exception table.
223 ExceptionTable exc_table(me);
224
225 // Allocate one extra spot in our list of exceptions. This
226 // last entry will be used to represent the possibility that
227 // an exception escapes the method. See ciExceptionHandlerStream
228 // for details.
229 _exception_handlers =
230 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
231 * (_handler_count + 1));
232 if (_handler_count > 0) {
233 for (int i=0; i<_handler_count; i++) {
234 _exception_handlers[i] = new (arena) ciExceptionHandler(
235 holder(),
236 /* start */ exc_table.start_pc(i),
237 /* limit */ exc_table.end_pc(i),
238 /* goto pc */ exc_table.handler_pc(i),
239 /* cp index */ exc_table.catch_type_index(i));
240 }
241 }
242
243 // Put an entry at the end of our list to represent the possibility
244 // of exceptional exit.
245 _exception_handlers[_handler_count] =
246 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
247
248 if (CIPrintMethodCodes) {
249 print_codes();
250 }
251 }
252
253
254 // ------------------------------------------------------------------
255 // ciMethod::has_linenumber_table
256 //
257 // length unknown until decompression
258 bool ciMethod::has_linenumber_table() const {
259 check_is_loaded();
260 VM_ENTRY_MARK;
261 return get_Method()->has_linenumber_table();
262 }
263
264
265 // ------------------------------------------------------------------
266 // ciMethod::line_number_from_bci
267 int ciMethod::line_number_from_bci(int bci) const {
268 check_is_loaded();
269 VM_ENTRY_MARK;
270 return get_Method()->line_number_from_bci(bci);
271 }
272
273
274 // ------------------------------------------------------------------
275 // ciMethod::vtable_index
276 //
277 // Get the position of this method's entry in the vtable, if any.
278 int ciMethod::vtable_index() {
279 check_is_loaded();
280 assert(holder()->is_linked(), "must be linked");
281 VM_ENTRY_MARK;
282 return get_Method()->vtable_index();
283 }
284
285 // ------------------------------------------------------------------
286 // ciMethod::uses_balanced_monitors
287 //
288 // Does this method use monitors in a strict stack-disciplined manner?
289 bool ciMethod::has_balanced_monitors() {
290 check_is_loaded();
291 if (_balanced_monitors) return true;
292
293 // Analyze the method to see if monitors are used properly.
294 VM_ENTRY_MARK;
295 methodHandle method(THREAD, get_Method());
296 assert(method->has_monitor_bytecodes(), "should have checked this");
297
298 // Check to see if a previous compilation computed the
299 // monitor-matching analysis.
300 if (method->guaranteed_monitor_matching()) {
301 _balanced_monitors = true;
302 return true;
303 }
304
305 {
306 ExceptionMark em(THREAD);
307 ResourceMark rm(THREAD);
308 GeneratePairingInfo gpi(method);
309 if (!gpi.compute_map(THREAD)) {
310 fatal("Unrecoverable verification or out-of-memory error");
311 }
312 if (!gpi.monitor_safe()) {
313 return false;
314 }
315 method->set_guaranteed_monitor_matching();
316 _balanced_monitors = true;
317 }
318 return true;
319 }
320
321
322 // ------------------------------------------------------------------
323 // ciMethod::get_flow_analysis
324 ciTypeFlow* ciMethod::get_flow_analysis() {
325 #if defined(COMPILER2)
326 if (_flow == nullptr) {
327 ciEnv* env = CURRENT_ENV;
328 _flow = new (env->arena()) ciTypeFlow(env, this);
329 _flow->do_flow();
330 }
331 return _flow;
332 #else // COMPILER2
333 ShouldNotReachHere();
334 return nullptr;
335 #endif // COMPILER2
336 }
337
338
339 // ------------------------------------------------------------------
340 // ciMethod::get_osr_flow_analysis
341 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
342 #if defined(COMPILER2)
343 // OSR entry points are always place after a call bytecode of some sort
344 assert(osr_bci >= 0, "must supply valid OSR entry point");
345 ciEnv* env = CURRENT_ENV;
346 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
347 flow->do_flow();
348 return flow;
349 #else // COMPILER2
350 ShouldNotReachHere();
351 return nullptr;
352 #endif // COMPILER2
353 }
354
355 // ------------------------------------------------------------------
356 // ciMethod::raw_liveness_at_bci
357 //
358 // Which local variables are live at a specific bci?
359 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
360 check_is_loaded();
361 if (_liveness == nullptr) {
362 // Create the liveness analyzer.
363 Arena* arena = CURRENT_ENV->arena();
364 _liveness = new (arena) MethodLiveness(arena, this);
365 _liveness->compute_liveness();
366 }
367 return _liveness->get_liveness_at(bci);
368 }
369
370 // ------------------------------------------------------------------
371 // ciMethod::liveness_at_bci
372 //
373 // Which local variables are live at a specific bci? When debugging
374 // will return true for all locals in some cases to improve debug
375 // information.
376 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
377 if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot) {
378 // Keep all locals live for the user's edification and amusement.
379 MethodLivenessResult result(_max_locals);
380 result.set_range(0, _max_locals);
381 result.set_is_valid();
382 return result;
383 }
384 return raw_liveness_at_bci(bci);
385 }
386
387 // ciMethod::live_local_oops_at_bci
388 //
389 // find all the live oops in the locals array for a particular bci
390 // Compute what the interpreter believes by using the interpreter
391 // oopmap generator. This is used as a double check during osr to
392 // guard against conservative result from MethodLiveness making us
393 // think a dead oop is live. MethodLiveness is conservative in the
394 // sense that it may consider locals to be live which cannot be live,
395 // like in the case where a local could contain an oop or a primitive
396 // along different paths. In that case the local must be dead when
397 // those paths merge. Since the interpreter's viewpoint is used when
398 // gc'ing an interpreter frame we need to use its viewpoint during
399 // OSR when loading the locals.
400
401 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
402 VM_ENTRY_MARK;
403 InterpreterOopMap mask;
404 OopMapCache::compute_one_oop_map(methodHandle(THREAD, get_Method()), bci, &mask);
405 int mask_size = max_locals();
406 ResourceBitMap result(mask_size);
407 int i;
408 for (i = 0; i < mask_size ; i++ ) {
409 if (mask.is_oop(i)) result.set_bit(i);
410 }
411 return result;
412 }
413
414
415 #ifdef COMPILER1
416 // ------------------------------------------------------------------
417 // ciMethod::bci_block_start
418 //
419 // Marks all bcis where a new basic block starts
420 const BitMap& ciMethod::bci_block_start() {
421 check_is_loaded();
422 if (_liveness == nullptr) {
423 // Create the liveness analyzer.
424 Arena* arena = CURRENT_ENV->arena();
425 _liveness = new (arena) MethodLiveness(arena, this);
426 _liveness->compute_liveness();
427 }
428
429 return _liveness->get_bci_block_start();
430 }
431 #endif // COMPILER1
432
433
434 // ------------------------------------------------------------------
435 // ciMethod::check_overflow
436 //
437 // Check whether the profile counter is overflowed and adjust if true.
438 // For invoke* it will turn negative values into max_jint,
439 // and for checkcast/aastore/instanceof turn positive values into min_jint.
440 int ciMethod::check_overflow(int c, Bytecodes::Code code) {
441 switch (code) {
442 case Bytecodes::_aastore: // fall-through
443 case Bytecodes::_checkcast: // fall-through
444 case Bytecodes::_instanceof: {
445 return (c > 0 ? min_jint : c); // always non-positive
446 }
447 default: {
448 assert(Bytecodes::is_invoke(code), "%s", Bytecodes::name(code));
449 return (c < 0 ? max_jint : c); // always non-negative
450 }
451 }
452 }
453
454
455 // ------------------------------------------------------------------
456 // ciMethod::call_profile_at_bci
457 //
458 // Get the ciCallProfile for the invocation of this method.
459 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
460 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
461 ResourceMark rm;
462 ciCallProfile result;
463 if (method_data() != nullptr && method_data()->is_mature()) {
464 ciProfileData* data = method_data()->bci_to_data(bci);
465 if (data != nullptr && data->is_CounterData()) {
466 // Every profiled call site has a counter.
467 int count = check_overflow(data->as_CounterData()->count(), java_code_at_bci(bci));
468
469 if (!data->is_ReceiverTypeData()) {
470 result._receiver_count[0] = 0; // that's a definite zero
471 } else { // ReceiverTypeData is a subclass of CounterData
472 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
473 // In addition, virtual call sites have receiver type information
474 int receivers_count_total = 0;
475 int morphism = 0;
476 // Precompute morphism for the possible fixup
477 for (uint i = 0; i < call->row_limit(); i++) {
478 ciKlass* receiver = call->receiver(i);
479 if (receiver == nullptr) continue;
480 morphism++;
481 }
482 int epsilon = 0;
483 // For a call, it is assumed that either the type of the receiver(s)
484 // is recorded or an associated counter is incremented, but not both. With
485 // tiered compilation, however, both can happen due to the interpreter and
486 // C1 profiling invocations differently. Address that inconsistency here.
487 if (morphism == 1 && count > 0) {
488 epsilon = count;
489 count = 0;
490 }
491 for (uint i = 0; i < call->row_limit(); i++) {
492 ciKlass* receiver = call->receiver(i);
493 if (receiver == nullptr) continue;
494 int rcount = saturated_add(call->receiver_count(i), epsilon);
495 if (rcount == 0) rcount = 1; // Should be valid value
496 receivers_count_total = saturated_add(receivers_count_total, rcount);
497 // Add the receiver to result data.
498 result.add_receiver(receiver, rcount);
499 // If we extend profiling to record methods,
500 // we will set result._method also.
501 }
502 // Determine call site's morphism.
503 // The call site count is 0 with known morphism (only 1 or 2 receivers)
504 // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
505 // The call site count is > 0 in the case of a polymorphic virtual call.
506 if (morphism > 0 && morphism == result._limit) {
507 // The morphism <= MorphismLimit.
508 if ((morphism < ciCallProfile::MorphismLimit) ||
509 (morphism == ciCallProfile::MorphismLimit && count == 0)) {
510 #ifdef ASSERT
511 if (count > 0) {
512 this->print_short_name(tty);
513 tty->print_cr(" @ bci:%d", bci);
514 this->print_codes();
515 assert(false, "this call site should not be polymorphic");
516 }
517 #endif
518 result._morphism = morphism;
519 }
520 }
521 // Make the count consistent if this is a call profile. If count is
522 // zero or less, presume that this is a typecheck profile and
523 // do nothing. Otherwise, increase count to be the sum of all
524 // receiver's counts.
525 if (count >= 0) {
526 count = saturated_add(count, receivers_count_total);
527 }
528 }
529 result._count = count;
530 }
531 }
532 return result;
533 }
534
535 // ------------------------------------------------------------------
536 // Add new receiver and sort data by receiver's profile count.
537 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
538 // Add new receiver and sort data by receiver's counts when we have space
539 // for it otherwise replace the less called receiver (less called receiver
540 // is placed to the last array element which is not used).
541 // First array's element contains most called receiver.
542 int i = _limit;
543 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
544 _receiver[i] = _receiver[i-1];
545 _receiver_count[i] = _receiver_count[i-1];
546 }
547 _receiver[i] = receiver;
548 _receiver_count[i] = receiver_count;
549 if (_limit < MorphismLimit) _limit++;
550 }
551
552
553 void ciMethod::assert_virtual_call_type_ok(int bci) {
554 assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
555 java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
556 }
557
558 void ciMethod::assert_call_type_ok(int bci) {
559 assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
560 java_code_at_bci(bci) == Bytecodes::_invokespecial ||
561 java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
562 }
563
564 /**
565 * Check whether profiling provides a type for the argument i to the
566 * call at bci bci
567 *
568 * @param [in]bci bci of the call
569 * @param [in]i argument number
570 * @param [out]type profiled type of argument, null if none
571 * @param [out]ptr_kind whether always null, never null or maybe null
572 * @return true if profiling exists
573 *
574 */
575 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
576 if (MethodData::profile_parameters() && method_data() != nullptr && method_data()->is_mature()) {
577 ciProfileData* data = method_data()->bci_to_data(bci);
578 if (data != nullptr) {
579 if (data->is_VirtualCallTypeData()) {
580 assert_virtual_call_type_ok(bci);
581 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
582 if (i >= call->number_of_arguments()) {
583 return false;
584 }
585 type = call->valid_argument_type(i);
586 ptr_kind = call->argument_ptr_kind(i);
587 return true;
588 } else if (data->is_CallTypeData()) {
589 assert_call_type_ok(bci);
590 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
591 if (i >= call->number_of_arguments()) {
592 return false;
593 }
594 type = call->valid_argument_type(i);
595 ptr_kind = call->argument_ptr_kind(i);
596 return true;
597 }
598 }
599 }
600 return false;
601 }
602
603 /**
604 * Check whether profiling provides a type for the return value from
605 * the call at bci bci
606 *
607 * @param [in]bci bci of the call
608 * @param [out]type profiled type of argument, null if none
609 * @param [out]ptr_kind whether always null, never null or maybe null
610 * @return true if profiling exists
611 *
612 */
613 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
614 if (MethodData::profile_return() && method_data() != nullptr && method_data()->is_mature()) {
615 ciProfileData* data = method_data()->bci_to_data(bci);
616 if (data != nullptr) {
617 if (data->is_VirtualCallTypeData()) {
618 assert_virtual_call_type_ok(bci);
619 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
620 if (call->has_return()) {
621 type = call->valid_return_type();
622 ptr_kind = call->return_ptr_kind();
623 return true;
624 }
625 } else if (data->is_CallTypeData()) {
626 assert_call_type_ok(bci);
627 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
628 if (call->has_return()) {
629 type = call->valid_return_type();
630 ptr_kind = call->return_ptr_kind();
631 }
632 return true;
633 }
634 }
635 }
636 return false;
637 }
638
639 /**
640 * Check whether profiling provides a type for the parameter i
641 *
642 * @param [in]i parameter number
643 * @param [out]type profiled type of parameter, null if none
644 * @param [out]ptr_kind whether always null, never null or maybe null
645 * @return true if profiling exists
646 *
647 */
648 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
649 if (MethodData::profile_parameters() && method_data() != nullptr && method_data()->is_mature()) {
650 ciParametersTypeData* parameters = method_data()->parameters_type_data();
651 if (parameters != nullptr && i < parameters->number_of_parameters()) {
652 type = parameters->valid_parameter_type(i);
653 ptr_kind = parameters->parameter_ptr_kind(i);
654 return true;
655 }
656 }
657 return false;
658 }
659
660 bool ciMethod::array_access_profiled_type(int bci, ciKlass*& array_type, ciKlass*& element_type, ProfilePtrKind& element_ptr, bool &flat_array, bool &null_free_array) {
661 if (method_data() != nullptr && method_data()->is_mature()) {
662 ciProfileData* data = method_data()->bci_to_data(bci);
663 if (data != nullptr && data->is_ArrayLoadStoreData()) {
664 ciArrayLoadStoreData* array_access = (ciArrayLoadStoreData*)data->as_ArrayLoadStoreData();
665 array_type = array_access->array()->valid_type();
666 element_type = array_access->element()->valid_type();
667 element_ptr = array_access->element()->ptr_kind();
668 flat_array = array_access->flat_array();
669 null_free_array = array_access->null_free_array();
670 return true;
671 }
672 }
673 return false;
674 }
675
676 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) {
677 if (method_data() != nullptr && method_data()->is_mature()) {
678 ciProfileData* data = method_data()->bci_to_data(bci);
679 if (data != nullptr && data->is_ACmpData()) {
680 ciACmpData* acmp = (ciACmpData*)data->as_ACmpData();
681 left_type = acmp->left()->valid_type();
682 right_type = acmp->right()->valid_type();
683 left_ptr = acmp->left()->ptr_kind();
684 right_ptr = acmp->right()->ptr_kind();
685 left_inline_type = acmp->left_inline_type();
686 right_inline_type = acmp->right_inline_type();
687 return true;
688 }
689 }
690 return false;
691 }
692
693
694 // ------------------------------------------------------------------
695 // ciMethod::find_monomorphic_target
696 //
697 // Given a certain calling environment, find the monomorphic target
698 // for the call. Return null if the call is not monomorphic in
699 // its calling environment, or if there are only abstract methods.
700 // The returned method is never abstract.
701 // Note: If caller uses a non-null result, it must inform dependencies
702 // via assert_unique_concrete_method or assert_leaf_type.
703 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
704 ciInstanceKlass* callee_holder,
705 ciInstanceKlass* actual_recv,
706 bool check_access) {
707 check_is_loaded();
708
709 if (actual_recv->is_interface()) {
710 // %%% We cannot trust interface types, yet. See bug 6312651.
711 return nullptr;
712 }
713
714 ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access, true /* allow_abstract */);
715 if (root_m == nullptr) {
716 // Something went wrong looking up the actual receiver method.
717 return nullptr;
718 }
719
720 // Make certain quick checks even if UseCHA is false.
721
722 // Is it private or final?
723 if (root_m->can_be_statically_bound()) {
724 assert(!root_m->is_abstract(), "sanity");
725 return root_m;
726 }
727
728 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
729 // Easy case. There is no other place to put a method, so don't bother
730 // to go through the VM_ENTRY_MARK and all the rest.
731 if (root_m->is_abstract()) {
732 return nullptr;
733 }
734 return root_m;
735 }
736
737 // Array methods (clone, hashCode, etc.) are always statically bound.
738 // If we were to see an array type here, we'd return root_m.
739 // However, this method processes only ciInstanceKlasses. (See 4962591.)
740 // The inline_native_clone intrinsic narrows Object to T[] properly,
741 // so there is no need to do the same job here.
742
743 if (!UseCHA) return nullptr;
744
745 VM_ENTRY_MARK;
746
747 methodHandle target;
748 {
749 MutexLocker locker(Compile_lock);
750 InstanceKlass* context = actual_recv->get_instanceKlass();
751 if (UseVtableBasedCHA) {
752 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context,
753 root_m->get_Method(),
754 callee_holder->get_Klass(),
755 this->get_Method()));
756 } else {
757 if (root_m->is_abstract()) {
758 return nullptr; // not supported
759 }
760 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context, root_m->get_Method()));
761 }
762 assert(target() == nullptr || !target()->is_abstract(), "not allowed");
763 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
764 }
765
766 #ifndef PRODUCT
767 LogTarget(Debug, dependencies) lt;
768 if (lt.is_enabled() && target() != nullptr && target() != root_m->get_Method()) {
769 LogStream ls(<);
770 ls.print("found a non-root unique target method");
771 ls.print_cr(" context = %s", actual_recv->get_Klass()->external_name());
772 ls.print(" method = ");
773 target->print_short_name(&ls);
774 ls.cr();
775 }
776 #endif //PRODUCT
777
778 if (target() == nullptr) {
779 return nullptr;
780 }
781 if (target() == root_m->get_Method()) {
782 return root_m;
783 }
784 if (!root_m->is_public() &&
785 !root_m->is_protected()) {
786 // If we are going to reason about inheritance, it's easiest
787 // if the method in question is public, protected, or private.
788 // If the answer is not root_m, it is conservatively correct
789 // to return null, even if the CHA encountered irrelevant
790 // methods in other packages.
791 // %%% TO DO: Work out logic for package-private methods
792 // with the same name but different vtable indexes.
793 return nullptr;
794 }
795 return CURRENT_THREAD_ENV->get_method(target());
796 }
797
798 // ------------------------------------------------------------------
799 // ciMethod::can_be_statically_bound
800 //
801 // Tries to determine whether a method can be statically bound in some context.
802 bool ciMethod::can_be_statically_bound(ciInstanceKlass* context) const {
803 return (holder() == context) && can_be_statically_bound();
804 }
805
806 // ------------------------------------------------------------------
807 // ciMethod::can_omit_stack_trace
808 //
809 // Tries to determine whether a method can omit stack trace in throw in compiled code.
810 bool ciMethod::can_omit_stack_trace() const {
811 if (!StackTraceInThrowable) {
812 return true; // stack trace is switched off.
813 }
814 if (!OmitStackTraceInFastThrow) {
815 return false; // Have to provide stack trace.
816 }
817 return _can_omit_stack_trace;
818 }
819
820 // ------------------------------------------------------------------
821 // ciMethod::resolve_invoke
822 //
823 // Given a known receiver klass, find the target for the call.
824 // Return null if the call has no target or the target is abstract.
825 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access, bool allow_abstract) {
826 check_is_loaded();
827 VM_ENTRY_MARK;
828
829 Klass* caller_klass = caller->get_Klass();
830 Klass* recv = exact_receiver->get_Klass();
831 Klass* resolved = holder()->get_Klass();
832 Symbol* h_name = name()->get_symbol();
833 Symbol* h_signature = signature()->get_symbol();
834
835 LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
836 check_access ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
837 check_access ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
838 Method* m = nullptr;
839 // Only do exact lookup if receiver klass has been linked. Otherwise,
840 // the vtable has not been setup, and the LinkResolver will fail.
841 if (recv->is_array_klass()
842 ||
843 (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
844 if (holder()->is_interface()) {
845 m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
846 } else {
847 m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
848 }
849 }
850
851 if (m == nullptr) {
852 // Return null only if there was a problem with lookup (uninitialized class, etc.)
853 return nullptr;
854 }
855
856 ciMethod* result = this;
857 if (m != get_Method()) {
858 result = CURRENT_THREAD_ENV->get_method(m);
859 }
860
861 if (result->is_abstract() && !allow_abstract) {
862 // Don't return abstract methods because they aren't optimizable or interesting.
863 return nullptr;
864 }
865 return result;
866 }
867
868 // ------------------------------------------------------------------
869 // ciMethod::resolve_vtable_index
870 //
871 // Given a known receiver klass, find the vtable index for the call.
872 // Return Method::invalid_vtable_index if the vtable_index is unknown.
873 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
874 check_is_loaded();
875
876 int vtable_index = Method::invalid_vtable_index;
877 // Only do lookup if receiver klass has been linked. Otherwise,
878 // the vtable has not been setup, and the LinkResolver will fail.
879 if (!receiver->is_interface()
880 && (!receiver->is_instance_klass() ||
881 receiver->as_instance_klass()->is_linked())) {
882 VM_ENTRY_MARK;
883
884 Klass* caller_klass = caller->get_Klass();
885 Klass* recv = receiver->get_Klass();
886 Symbol* h_name = name()->get_symbol();
887 Symbol* h_signature = signature()->get_symbol();
888
889 LinkInfo link_info(recv, h_name, h_signature, caller_klass);
890 vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
891 if (vtable_index == Method::nonvirtual_vtable_index) {
892 // A statically bound method. Return "no such index".
893 vtable_index = Method::invalid_vtable_index;
894 }
895 }
896
897 return vtable_index;
898 }
899
900 // ------------------------------------------------------------------
901 // ciMethod::get_field_at_bci
902 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
903 ciBytecodeStream iter(this);
904 iter.reset_to_bci(bci);
905 iter.next();
906 return iter.get_field(will_link);
907 }
908
909 // ------------------------------------------------------------------
910 // ciMethod::get_method_at_bci
911 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
912 ciBytecodeStream iter(this);
913 iter.reset_to_bci(bci);
914 iter.next();
915 return iter.get_method(will_link, declared_signature);
916 }
917
918 // ------------------------------------------------------------------
919 ciKlass* ciMethod::get_declared_method_holder_at_bci(int bci) {
920 ciBytecodeStream iter(this);
921 iter.reset_to_bci(bci);
922 iter.next();
923 return iter.get_declared_method_holder();
924 }
925
926 // ------------------------------------------------------------------
927 // Adjust a CounterData count to be commensurate with
928 // interpreter_invocation_count. If the MDO exists for
929 // only 25% of the time the method exists, then the
930 // counts in the MDO should be scaled by 4X, so that
931 // they can be usefully and stably compared against the
932 // invocation counts in methods.
933 int ciMethod::scale_count(int count, float prof_factor) {
934 if (count > 0 && method_data() != nullptr) {
935 int counter_life = method_data()->invocation_count();
936 int method_life = interpreter_invocation_count();
937 if (method_life < counter_life) { // may happen because of the snapshot timing
938 method_life = counter_life;
939 }
940 if (counter_life > 0) {
941 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
942 count = (count > 0) ? count : 1;
943 } else {
944 count = 1;
945 }
946 }
947 return count;
948 }
949
950
951 // ------------------------------------------------------------------
952 // ciMethod::is_special_get_caller_class_method
953 //
954 bool ciMethod::is_ignored_by_security_stack_walk() const {
955 check_is_loaded();
956 VM_ENTRY_MARK;
957 return get_Method()->is_ignored_by_security_stack_walk();
958 }
959
960 // ------------------------------------------------------------------
961 // ciMethod::needs_clinit_barrier
962 //
963 bool ciMethod::needs_clinit_barrier() const {
964 check_is_loaded();
965 return is_static() && !holder()->is_initialized();
966 }
967
968 // ------------------------------------------------------------------
969 // invokedynamic support
970
971 // ------------------------------------------------------------------
972 // ciMethod::is_method_handle_intrinsic
973 //
974 // Return true if the method is an instance of the JVM-generated
975 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
976 bool ciMethod::is_method_handle_intrinsic() const {
977 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
978 return (MethodHandles::is_signature_polymorphic(iid) &&
979 MethodHandles::is_signature_polymorphic_intrinsic(iid));
980 }
981
982 // ------------------------------------------------------------------
983 // ciMethod::is_compiled_lambda_form
984 //
985 // Return true if the method is a generated MethodHandle adapter.
986 // These are built by Java code.
987 bool ciMethod::is_compiled_lambda_form() const {
988 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
989 return iid == vmIntrinsics::_compiledLambdaForm;
990 }
991
992 // ------------------------------------------------------------------
993 // ciMethod::is_object_constructor
994 //
995 bool ciMethod::is_object_constructor() const {
996 return (name() == ciSymbols::object_initializer_name()
997 && signature()->return_type()->is_void());
998 // Note: We can't test is_static, because that would
999 // require the method to be loaded. Sometimes it isn't.
1000 }
1001
1002 // ------------------------------------------------------------------
1003 // ciMethod::is_static_vnew_factory
1004 //
1005 bool ciMethod::is_static_vnew_factory() const {
1006 return (name() == ciSymbols::inline_factory_name()
1007 && !signature()->return_type()->is_void());
1008 // Note: We can't test is_static, because that would
1009 // require the method to be loaded. Sometimes it isn't.
1010 }
1011
1012 // ------------------------------------------------------------------
1013 // ciMethod::has_member_arg
1014 //
1015 // Return true if the method is a linker intrinsic like _linkToVirtual.
1016 // These are built by the JVM.
1017 bool ciMethod::has_member_arg() const {
1018 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
1019 return (MethodHandles::is_signature_polymorphic(iid) &&
1020 MethodHandles::has_member_arg(iid));
1021 }
1022
1023 // ------------------------------------------------------------------
1024 // ciMethod::ensure_method_data
1025 //
1026 // Generate new MethodData* objects at compile time.
1027 // Return true if allocation was successful or no MDO is required.
1028 bool ciMethod::ensure_method_data(const methodHandle& h_m) {
1029 EXCEPTION_CONTEXT;
1030 if (is_native() || is_abstract() || h_m()->is_accessor()) {
1031 return true;
1032 }
1033 if (h_m()->method_data() == nullptr) {
1034 Method::build_profiling_method_data(h_m, THREAD);
1035 if (HAS_PENDING_EXCEPTION) {
1036 CLEAR_PENDING_EXCEPTION;
1037 }
1038 }
1039 if (h_m()->method_data() != nullptr) {
1040 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1041 return _method_data->load_data();
1042 } else {
1043 _method_data = CURRENT_ENV->get_empty_methodData();
1044 return false;
1045 }
1046 }
1047
1048 // public, retroactive version
1049 bool ciMethod::ensure_method_data() {
1050 bool result = true;
1051 if (_method_data == nullptr || _method_data->is_empty()) {
1052 GUARDED_VM_ENTRY({
1053 methodHandle mh(Thread::current(), get_Method());
1054 result = ensure_method_data(mh);
1055 });
1056 }
1057 return result;
1058 }
1059
1060
1061 // ------------------------------------------------------------------
1062 // ciMethod::method_data
1063 //
1064 ciMethodData* ciMethod::method_data() {
1065 if (_method_data != nullptr) {
1066 return _method_data;
1067 }
1068 VM_ENTRY_MARK;
1069 ciEnv* env = CURRENT_ENV;
1070 Thread* my_thread = JavaThread::current();
1071 methodHandle h_m(my_thread, get_Method());
1072
1073 if (h_m()->method_data() != nullptr) {
1074 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1075 _method_data->load_data();
1076 } else {
1077 _method_data = CURRENT_ENV->get_empty_methodData();
1078 }
1079 return _method_data;
1080
1081 }
1082
1083 // ------------------------------------------------------------------
1084 // ciMethod::method_data_or_null
1085 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1086 // null otherwise.
1087 ciMethodData* ciMethod::method_data_or_null() {
1088 ciMethodData *md = method_data();
1089 if (md->is_empty()) {
1090 return nullptr;
1091 }
1092 return md;
1093 }
1094
1095 // ------------------------------------------------------------------
1096 // ciMethod::ensure_method_counters
1097 //
1098 MethodCounters* ciMethod::ensure_method_counters() {
1099 check_is_loaded();
1100 VM_ENTRY_MARK;
1101 methodHandle mh(THREAD, get_Method());
1102 MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1103 return method_counters;
1104 }
1105
1106 // ------------------------------------------------------------------
1107 // ciMethod::has_option
1108 //
1109 bool ciMethod::has_option(enum CompileCommand option) {
1110 check_is_loaded();
1111 VM_ENTRY_MARK;
1112 methodHandle mh(THREAD, get_Method());
1113 return CompilerOracle::has_option(mh, option);
1114 }
1115
1116 // ------------------------------------------------------------------
1117 // ciMethod::has_option_value
1118 //
1119 bool ciMethod::has_option_value(enum CompileCommand option, double& value) {
1120 check_is_loaded();
1121 VM_ENTRY_MARK;
1122 methodHandle mh(THREAD, get_Method());
1123 return CompilerOracle::has_option_value(mh, option, value);
1124 }
1125 // ------------------------------------------------------------------
1126 // ciMethod::can_be_compiled
1127 //
1128 // Have previous compilations of this method succeeded?
1129 bool ciMethod::can_be_compiled() {
1130 check_is_loaded();
1131 ciEnv* env = CURRENT_ENV;
1132 if (is_c1_compile(env->comp_level())) {
1133 return _is_c1_compilable;
1134 }
1135 return _is_c2_compilable;
1136 }
1137
1138 // ------------------------------------------------------------------
1139 // ciMethod::has_compiled_code
1140 bool ciMethod::has_compiled_code() {
1141 return inline_instructions_size() > 0;
1142 }
1143
1144 int ciMethod::highest_osr_comp_level() {
1145 check_is_loaded();
1146 VM_ENTRY_MARK;
1147 return get_Method()->highest_osr_comp_level();
1148 }
1149
1150 // ------------------------------------------------------------------
1151 // ciMethod::code_size_for_inlining
1152 //
1153 // Code size for inlining decisions. This method returns a code
1154 // size of 1 for methods which has the ForceInline annotation.
1155 int ciMethod::code_size_for_inlining() {
1156 check_is_loaded();
1157 if (get_Method()->force_inline()) {
1158 return 1;
1159 }
1160 return code_size();
1161 }
1162
1163 // ------------------------------------------------------------------
1164 // ciMethod::inline_instructions_size
1165 //
1166 // This is a rough metric for "fat" methods, compared before inlining
1167 // with InlineSmallCode. The CodeBlob::code_size accessor includes
1168 // junk like exception handler, stubs, and constant table, which are
1169 // not highly relevant to an inlined method. So we use the more
1170 // specific accessor nmethod::insts_size.
1171 // Also some instructions inside the code are excluded from inline
1172 // heuristic (e.g. post call nop instructions; see InlineSkippedInstructionsCounter)
1173 int ciMethod::inline_instructions_size() {
1174 if (_inline_instructions_size == -1) {
1175 GUARDED_VM_ENTRY(
1176 CompiledMethod* code = get_Method()->code();
1177 if (code != nullptr && (code->comp_level() == CompLevel_full_optimization)) {
1178 int isize = code->insts_end() - code->verified_entry_point() - code->skipped_instructions_size();
1179 _inline_instructions_size = isize > 0 ? isize : 0;
1180 } else {
1181 _inline_instructions_size = 0;
1182 }
1183 );
1184 }
1185 return _inline_instructions_size;
1186 }
1187
1188 // ------------------------------------------------------------------
1189 // ciMethod::log_nmethod_identity
1190 void ciMethod::log_nmethod_identity(xmlStream* log) {
1191 GUARDED_VM_ENTRY(
1192 CompiledMethod* code = get_Method()->code();
1193 if (code != nullptr) {
1194 code->log_identity(log);
1195 }
1196 )
1197 }
1198
1199 // ------------------------------------------------------------------
1200 // ciMethod::is_not_reached
1201 bool ciMethod::is_not_reached(int bci) {
1202 check_is_loaded();
1203 VM_ENTRY_MARK;
1204 return Interpreter::is_not_reached(
1205 methodHandle(THREAD, get_Method()), bci);
1206 }
1207
1208 // ------------------------------------------------------------------
1209 // ciMethod::was_never_executed
1210 bool ciMethod::was_executed_more_than(int times) {
1211 VM_ENTRY_MARK;
1212 return get_Method()->was_executed_more_than(times);
1213 }
1214
1215 // ------------------------------------------------------------------
1216 // ciMethod::has_unloaded_classes_in_signature
1217 bool ciMethod::has_unloaded_classes_in_signature() {
1218 // ciSignature is resolved against some accessing class and
1219 // signature classes aren't required to be local. As a benefit,
1220 // it makes signature classes visible through loader constraints.
1221 // So, encountering an unloaded class signals it is absent both in
1222 // the callee (local) and caller contexts.
1223 return signature()->has_unloaded_classes();
1224 }
1225
1226 // ------------------------------------------------------------------
1227 // ciMethod::is_klass_loaded
1228 bool ciMethod::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1229 VM_ENTRY_MARK;
1230 return get_Method()->is_klass_loaded(refinfo_index, bc, must_be_resolved);
1231 }
1232
1233 // ------------------------------------------------------------------
1234 // ciMethod::check_call
1235 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1236 // This method is used only in C2 from InlineTree::ok_to_inline,
1237 // and is only used under -Xcomp.
1238 // It appears to fail when applied to an invokeinterface call site.
1239 // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1240 VM_ENTRY_MARK;
1241 {
1242 ExceptionMark em(THREAD);
1243 HandleMark hm(THREAD);
1244 constantPoolHandle pool (THREAD, get_Method()->constants());
1245 Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1246 Method* spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1247 if (HAS_PENDING_EXCEPTION) {
1248 CLEAR_PENDING_EXCEPTION;
1249 return false;
1250 } else {
1251 return (spec_method->is_static() == is_static);
1252 }
1253 }
1254 return false;
1255 }
1256 // ------------------------------------------------------------------
1257 // ciMethod::print_codes
1258 //
1259 // Print the bytecodes for this method.
1260 void ciMethod::print_codes_on(outputStream* st) {
1261 check_is_loaded();
1262 GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1263 }
1264
1265
1266 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1267 check_is_loaded(); \
1268 VM_ENTRY_MARK; \
1269 return get_Method()->flag_accessor(); \
1270 }
1271
1272 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1273 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1274 bool ciMethod::is_getter () const { FETCH_FLAG_FROM_VM(is_getter); }
1275 bool ciMethod::is_setter () const { FETCH_FLAG_FROM_VM(is_setter); }
1276 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1277 bool ciMethod::is_object_constructor_or_class_initializer() const { FETCH_FLAG_FROM_VM(is_object_constructor_or_class_initializer); }
1278 bool ciMethod::is_empty () const { FETCH_FLAG_FROM_VM(is_empty_method); }
1279
1280 bool ciMethod::is_boxing_method() const {
1281 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1282 switch (intrinsic_id()) {
1283 case vmIntrinsics::_Boolean_valueOf:
1284 case vmIntrinsics::_Byte_valueOf:
1285 case vmIntrinsics::_Character_valueOf:
1286 case vmIntrinsics::_Short_valueOf:
1287 case vmIntrinsics::_Integer_valueOf:
1288 case vmIntrinsics::_Long_valueOf:
1289 case vmIntrinsics::_Float_valueOf:
1290 case vmIntrinsics::_Double_valueOf:
1291 return true;
1292 default:
1293 return false;
1294 }
1295 }
1296 return false;
1297 }
1298
1299 bool ciMethod::is_unboxing_method() const {
1300 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1301 switch (intrinsic_id()) {
1302 case vmIntrinsics::_booleanValue:
1303 case vmIntrinsics::_byteValue:
1304 case vmIntrinsics::_charValue:
1305 case vmIntrinsics::_shortValue:
1306 case vmIntrinsics::_intValue:
1307 case vmIntrinsics::_longValue:
1308 case vmIntrinsics::_floatValue:
1309 case vmIntrinsics::_doubleValue:
1310 return true;
1311 default:
1312 return false;
1313 }
1314 }
1315 return false;
1316 }
1317
1318 bool ciMethod::is_vector_method() const {
1319 return (holder() == ciEnv::current()->vector_VectorSupport_klass()) &&
1320 (intrinsic_id() != vmIntrinsics::_none);
1321 }
1322
1323 BCEscapeAnalyzer *ciMethod::get_bcea() {
1324 #ifdef COMPILER2
1325 if (_bcea == nullptr) {
1326 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, nullptr);
1327 }
1328 return _bcea;
1329 #else // COMPILER2
1330 ShouldNotReachHere();
1331 return nullptr;
1332 #endif // COMPILER2
1333 }
1334
1335 ciMethodBlocks *ciMethod::get_method_blocks() {
1336 if (_method_blocks == nullptr) {
1337 Arena *arena = CURRENT_ENV->arena();
1338 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1339 }
1340 return _method_blocks;
1341 }
1342
1343 #undef FETCH_FLAG_FROM_VM
1344
1345 void ciMethod::dump_name_as_ascii(outputStream* st, Method* method) {
1346 st->print("%s %s %s",
1347 CURRENT_ENV->replay_name(method->method_holder()),
1348 method->name()->as_quoted_ascii(),
1349 method->signature()->as_quoted_ascii());
1350 }
1351
1352 void ciMethod::dump_name_as_ascii(outputStream* st) {
1353 Method* method = get_Method();
1354 dump_name_as_ascii(st, method);
1355 }
1356
1357 void ciMethod::dump_replay_data(outputStream* st) {
1358 ResourceMark rm;
1359 Method* method = get_Method();
1360 if (MethodHandles::is_signature_polymorphic_method(method)) {
1361 // ignore for now
1362 return;
1363 }
1364 MethodCounters* mcs = method->method_counters();
1365 st->print("ciMethod ");
1366 dump_name_as_ascii(st);
1367 st->print_cr(" %d %d %d %d %d",
1368 mcs == nullptr ? 0 : mcs->invocation_counter()->raw_counter(),
1369 mcs == nullptr ? 0 : mcs->backedge_counter()->raw_counter(),
1370 interpreter_invocation_count(),
1371 interpreter_throwout_count(),
1372 _inline_instructions_size);
1373 }
1374
1375 // ------------------------------------------------------------------
1376 // ciMethod::print_codes
1377 //
1378 // Print a range of the bytecodes for this method.
1379 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1380 check_is_loaded();
1381 GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1382 }
1383
1384 // ------------------------------------------------------------------
1385 // ciMethod::print_name
1386 //
1387 // Print the name of this method, including signature and some flags.
1388 void ciMethod::print_name(outputStream* st) {
1389 check_is_loaded();
1390 GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1391 }
1392
1393 // ------------------------------------------------------------------
1394 // ciMethod::print_short_name
1395 //
1396 // Print the name of this method, without signature.
1397 void ciMethod::print_short_name(outputStream* st) {
1398 if (is_loaded()) {
1399 GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1400 } else {
1401 // Fall back if method is not loaded.
1402 holder()->print_name_on(st);
1403 st->print("::");
1404 name()->print_symbol_on(st);
1405 if (WizardMode)
1406 signature()->as_symbol()->print_symbol_on(st);
1407 }
1408 }
1409
1410 // ------------------------------------------------------------------
1411 // ciMethod::print_impl
1412 //
1413 // Implementation of the print method.
1414 void ciMethod::print_impl(outputStream* st) {
1415 ciMetadata::print_impl(st);
1416 st->print(" name=");
1417 name()->print_symbol_on(st);
1418 st->print(" holder=");
1419 holder()->print_name_on(st);
1420 st->print(" signature=");
1421 signature()->as_symbol()->print_symbol_on(st);
1422 if (is_loaded()) {
1423 st->print(" loaded=true");
1424 st->print(" arg_size=%d", arg_size());
1425 st->print(" flags=");
1426 flags().print_member_flags(st);
1427 } else {
1428 st->print(" loaded=false");
1429 }
1430 }
1431
1432 // ------------------------------------------------------------------
1433
1434 static BasicType erase_to_word_type(BasicType bt) {
1435 if (is_subword_type(bt)) return T_INT;
1436 if (is_reference_type(bt)) return T_OBJECT;
1437 if (bt == T_PRIMITIVE_OBJECT) return T_OBJECT;
1438 return bt;
1439 }
1440
1441 static bool basic_types_match(ciType* t1, ciType* t2) {
1442 if (t1 == t2) return true;
1443 return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1444 }
1445
1446 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1447 bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1448 !resolved_method->is_method_handle_intrinsic();
1449
1450 if (!invoke_through_mh_intrinsic) {
1451 // Method name & descriptor should stay the same.
1452 // Signatures may reference unloaded types and thus they may be not strictly equal.
1453 ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1454 ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1455
1456 return (declared_method->name()->equals(resolved_method->name())) &&
1457 (declared_signature->equals(resolved_signature));
1458 }
1459
1460 ciMethod* linker = declared_method;
1461 ciMethod* target = resolved_method;
1462 // Linkers have appendix argument which is not passed to callee.
1463 int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1464 if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1465 return false; // argument slot count mismatch
1466 }
1467
1468 ciSignature* linker_sig = linker->signature();
1469 ciSignature* target_sig = target->signature();
1470
1471 if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1472 target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1473 return false; // argument count mismatch
1474 }
1475
1476 int sbase = 0, rbase = 0;
1477 switch (linker->intrinsic_id()) {
1478 case vmIntrinsics::_linkToVirtual:
1479 case vmIntrinsics::_linkToInterface:
1480 case vmIntrinsics::_linkToSpecial: {
1481 if (target->is_static()) {
1482 return false;
1483 }
1484 if (linker_sig->type_at(0)->is_primitive_type()) {
1485 return false; // receiver should be an oop
1486 }
1487 sbase = 1; // skip receiver
1488 break;
1489 }
1490 case vmIntrinsics::_linkToStatic: {
1491 if (!target->is_static()) {
1492 return false;
1493 }
1494 break;
1495 }
1496 case vmIntrinsics::_invokeBasic: {
1497 if (target->is_static()) {
1498 if (target_sig->type_at(0)->is_primitive_type()) {
1499 return false; // receiver should be an oop
1500 }
1501 rbase = 1; // skip receiver
1502 }
1503 break;
1504 }
1505 default:
1506 break;
1507 }
1508 assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1509 int arg_count = target_sig->count() - rbase;
1510 for (int i = 0; i < arg_count; i++) {
1511 if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1512 return false;
1513 }
1514 }
1515 // Only check the return type if the symbolic info has non-void return type.
1516 // I.e. the return value of the resolved method can be dropped.
1517 if (!linker->return_type()->is_void() &&
1518 !basic_types_match(linker->return_type(), target->return_type())) {
1519 return false;
1520 }
1521 return true; // no mismatch found
1522 }
1523
1524 // ------------------------------------------------------------------
1525
1526 bool ciMethod::is_scalarized_arg(int idx) const {
1527 VM_ENTRY_MARK;
1528 return get_Method()->is_scalarized_arg(idx);
1529 }
1530
1531 bool ciMethod::has_scalarized_args() const {
1532 VM_ENTRY_MARK;
1533 return get_Method()->has_scalarized_args();
1534 }
1535
1536 const GrowableArray<SigEntry>* ciMethod::get_sig_cc() const {
1537 VM_ENTRY_MARK;
1538 if (get_Method()->adapter() == nullptr) {
1539 return nullptr;
1540 }
1541 return get_Method()->adapter()->get_sig_cc();
1542 }