1 /*
2 * Copyright (c) 1999, 2024, 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/compilerOracle.hpp"
40 #include "compiler/methodLiveness.hpp"
41 #include "interpreter/interpreter.hpp"
42 #include "interpreter/linkResolver.hpp"
43 #include "interpreter/oopMapCache.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "oops/generateOopMap.hpp"
49 #include "oops/method.inline.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "prims/methodHandles.hpp"
52 #include "runtime/deoptimization.hpp"
53 #include "runtime/handles.inline.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 bool should_take_Compile_lock = !Compile_lock->owned_by_self();
113 ConditionalMutexLocker locker(Compile_lock, should_take_Compile_lock, Mutex::_safepoint_check_flag);
114 if (Dependencies::check_evol_method(h_m()) != nullptr) {
115 _is_c1_compilable = false;
116 _is_c2_compilable = false;
117 _can_be_parsed = false;
118 }
119 } else {
120 DEBUG_ONLY(CompilerThread::current()->check_possible_safepoint());
121 }
122
123 if (h_m->method_holder()->is_linked()) {
124 _can_be_statically_bound = h_m->can_be_statically_bound();
125 _can_omit_stack_trace = h_m->can_omit_stack_trace();
126 } else {
127 // Have to use a conservative value in this case.
128 _can_be_statically_bound = false;
129 _can_omit_stack_trace = true;
130 }
131
132 // Adjust the definition of this condition to be more useful:
133 // %%% take these conditions into account in vtable generation
134 if (!_can_be_statically_bound && h_m->is_private())
135 _can_be_statically_bound = true;
136 if (_can_be_statically_bound && h_m->is_abstract())
137 _can_be_statically_bound = false;
138
139 // generating _signature may allow GC and therefore move m.
140 // These fields are always filled in.
141 _name = env->get_symbol(h_m->name());
142 ciSymbol* sig_symbol = env->get_symbol(h_m->signature());
143 constantPoolHandle cpool(Thread::current(), h_m->constants());
144 _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
145 _method_data = nullptr;
146 // Take a snapshot of these values, so they will be commensurate with the MDO.
147 if (ProfileInterpreter || CompilerConfig::is_c1_profiling()) {
148 int invcnt = h_m->interpreter_invocation_count();
149 // if the value overflowed report it as max int
150 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
151 _interpreter_throwout_count = h_m->interpreter_throwout_count();
152 } else {
153 _interpreter_invocation_count = 0;
154 _interpreter_throwout_count = 0;
155 }
156 if (_interpreter_invocation_count == 0)
157 _interpreter_invocation_count = 1;
158 _inline_instructions_size = -1;
159 if (ReplayCompiles) {
160 ciReplay::initialize(this);
161 }
162 }
163
164
165 // ------------------------------------------------------------------
166 // ciMethod::ciMethod
167 //
168 // Unloaded method.
169 ciMethod::ciMethod(ciInstanceKlass* holder,
170 ciSymbol* name,
171 ciSymbol* signature,
172 ciInstanceKlass* accessor) :
173 ciMetadata((Metadata*)nullptr),
174 _name( name),
175 _holder( holder),
176 _method_data( nullptr),
177 _method_blocks( nullptr),
178 _intrinsic_id( vmIntrinsics::_none),
179 _inline_instructions_size(-1),
180 _can_be_statically_bound(false),
181 _can_omit_stack_trace(true),
182 _liveness( nullptr)
183 #if defined(COMPILER2)
184 ,
185 _flow( nullptr),
186 _bcea( nullptr)
187 #endif // COMPILER2
188 {
189 // Usually holder and accessor are the same type but in some cases
190 // the holder has the wrong class loader (e.g. invokedynamic call
191 // sites) so we pass the accessor.
192 _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
193 }
194
195
196 // ------------------------------------------------------------------
197 // ciMethod::load_code
198 //
199 // Load the bytecodes and exception handler table for this method.
200 void ciMethod::load_code() {
201 VM_ENTRY_MARK;
202 assert(is_loaded(), "only loaded methods have code");
203
204 Method* me = get_Method();
205 Arena* arena = CURRENT_THREAD_ENV->arena();
206
207 // Load the bytecodes.
208 _code = (address)arena->Amalloc(code_size());
209 memcpy(_code, me->code_base(), code_size());
210
211 #if INCLUDE_JVMTI
212 // Revert any breakpoint bytecodes in ci's copy
213 if (me->number_of_breakpoints() > 0) {
214 BreakpointInfo* bp = me->method_holder()->breakpoints();
215 for (; bp != nullptr; bp = bp->next()) {
216 if (bp->match(me)) {
217 code_at_put(bp->bci(), bp->orig_bytecode());
218 }
219 }
220 }
221 #endif
222
223 // And load the exception table.
224 ExceptionTable exc_table(me);
225
226 // Allocate one extra spot in our list of exceptions. This
227 // last entry will be used to represent the possibility that
228 // an exception escapes the method. See ciExceptionHandlerStream
229 // for details.
230 _exception_handlers =
231 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
232 * (_handler_count + 1));
233 if (_handler_count > 0) {
234 for (int i=0; i<_handler_count; i++) {
235 _exception_handlers[i] = new (arena) ciExceptionHandler(
236 holder(),
237 /* start */ exc_table.start_pc(i),
238 /* limit */ exc_table.end_pc(i),
239 /* goto pc */ exc_table.handler_pc(i),
240 /* cp index */ exc_table.catch_type_index(i));
241 }
242 }
243
244 // Put an entry at the end of our list to represent the possibility
245 // of exceptional exit.
246 _exception_handlers[_handler_count] =
247 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
248
249 if (CIPrintMethodCodes) {
250 print_codes();
251 }
252 }
253
254
255 // ------------------------------------------------------------------
256 // ciMethod::has_linenumber_table
257 //
258 // length unknown until decompression
259 bool ciMethod::has_linenumber_table() const {
260 check_is_loaded();
261 VM_ENTRY_MARK;
262 return get_Method()->has_linenumber_table();
263 }
264
265
266 // ------------------------------------------------------------------
267 // ciMethod::line_number_from_bci
268 int ciMethod::line_number_from_bci(int bci) const {
269 check_is_loaded();
270 VM_ENTRY_MARK;
271 return get_Method()->line_number_from_bci(bci);
272 }
273
274
275 // ------------------------------------------------------------------
276 // ciMethod::vtable_index
277 //
278 // Get the position of this method's entry in the vtable, if any.
279 int ciMethod::vtable_index() {
280 check_is_loaded();
281 assert(holder()->is_linked(), "must be linked");
282 VM_ENTRY_MARK;
283 return get_Method()->vtable_index();
284 }
285
286 // ------------------------------------------------------------------
287 // ciMethod::uses_balanced_monitors
288 //
289 // Does this method use monitors in a strict stack-disciplined manner?
290 bool ciMethod::has_balanced_monitors() {
291 check_is_loaded();
292 if (_balanced_monitors) return true;
293
294 // Analyze the method to see if monitors are used properly.
295 VM_ENTRY_MARK;
296 methodHandle method(THREAD, get_Method());
297 assert(method->has_monitor_bytecodes(), "should have checked this");
298
299 // Check to see if a previous compilation computed the
300 // monitor-matching analysis.
301 if (method->guaranteed_monitor_matching()) {
302 _balanced_monitors = true;
303 return true;
304 }
305
306 {
307 ExceptionMark em(THREAD);
308 ResourceMark rm(THREAD);
309 GeneratePairingInfo gpi(method);
310 if (!gpi.compute_map(THREAD)) {
311 fatal("Unrecoverable verification or out-of-memory error");
312 }
313 if (!gpi.monitor_safe()) {
314 return false;
315 }
316 method->set_guaranteed_monitor_matching();
317 _balanced_monitors = true;
318 }
319 return true;
320 }
321
322
323 // ------------------------------------------------------------------
324 // ciMethod::get_flow_analysis
325 ciTypeFlow* ciMethod::get_flow_analysis() {
326 #if defined(COMPILER2)
327 if (_flow == nullptr) {
328 ciEnv* env = CURRENT_ENV;
329 _flow = new (env->arena()) ciTypeFlow(env, this);
330 _flow->do_flow();
331 }
332 return _flow;
333 #else // COMPILER2
334 ShouldNotReachHere();
335 return nullptr;
336 #endif // COMPILER2
337 }
338
339
340 // ------------------------------------------------------------------
341 // ciMethod::get_osr_flow_analysis
342 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
343 #if defined(COMPILER2)
344 // OSR entry points are always place after a call bytecode of some sort
345 assert(osr_bci >= 0, "must supply valid OSR entry point");
346 ciEnv* env = CURRENT_ENV;
347 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
348 flow->do_flow();
349 return flow;
350 #else // COMPILER2
351 ShouldNotReachHere();
352 return nullptr;
353 #endif // COMPILER2
354 }
355
356 // ------------------------------------------------------------------
357 // ciMethod::raw_liveness_at_bci
358 //
359 // Which local variables are live at a specific bci?
360 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
361 check_is_loaded();
362 if (_liveness == nullptr) {
363 // Create the liveness analyzer.
364 Arena* arena = CURRENT_ENV->arena();
365 _liveness = new (arena) MethodLiveness(arena, this);
366 _liveness->compute_liveness();
367 }
368 return _liveness->get_liveness_at(bci);
369 }
370
371 // ------------------------------------------------------------------
372 // ciMethod::liveness_at_bci
373 //
374 // Which local variables are live at a specific bci? When debugging
375 // will return true for all locals in some cases to improve debug
376 // information.
377 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
378 if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot) {
379 // Keep all locals live for the user's edification and amusement.
380 MethodLivenessResult result(_max_locals);
381 result.set_range(0, _max_locals);
382 result.set_is_valid();
383 return result;
384 }
385 return raw_liveness_at_bci(bci);
386 }
387
388 // ciMethod::live_local_oops_at_bci
389 //
390 // find all the live oops in the locals array for a particular bci
391 // Compute what the interpreter believes by using the interpreter
392 // oopmap generator. This is used as a double check during osr to
393 // guard against conservative result from MethodLiveness making us
394 // think a dead oop is live. MethodLiveness is conservative in the
395 // sense that it may consider locals to be live which cannot be live,
396 // like in the case where a local could contain an oop or a primitive
397 // along different paths. In that case the local must be dead when
398 // those paths merge. Since the interpreter's viewpoint is used when
399 // gc'ing an interpreter frame we need to use its viewpoint during
400 // OSR when loading the locals.
401
402 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
403 VM_ENTRY_MARK;
404 InterpreterOopMap mask;
405 OopMapCache::compute_one_oop_map(methodHandle(THREAD, get_Method()), bci, &mask);
406 int mask_size = max_locals();
407 ResourceBitMap result(mask_size);
408 int i;
409 for (i = 0; i < mask_size ; i++ ) {
410 if (mask.is_oop(i)) result.set_bit(i);
411 }
412 return result;
413 }
414
415
416 #ifdef COMPILER1
417 // ------------------------------------------------------------------
418 // ciMethod::bci_block_start
419 //
420 // Marks all bcis where a new basic block starts
421 const BitMap& ciMethod::bci_block_start() {
422 check_is_loaded();
423 if (_liveness == nullptr) {
424 // Create the liveness analyzer.
425 Arena* arena = CURRENT_ENV->arena();
426 _liveness = new (arena) MethodLiveness(arena, this);
427 _liveness->compute_liveness();
428 }
429
430 return _liveness->get_bci_block_start();
431 }
432 #endif // COMPILER1
433
434
435 // ------------------------------------------------------------------
436 // ciMethod::check_overflow
437 //
438 // Check whether the profile counter is overflowed and adjust if true.
439 // For invoke* it will turn negative values into max_jint,
440 // and for checkcast/aastore/instanceof turn positive values into min_jint.
441 int ciMethod::check_overflow(int c, Bytecodes::Code code) {
442 switch (code) {
443 case Bytecodes::_aastore: // fall-through
444 case Bytecodes::_checkcast: // fall-through
445 case Bytecodes::_instanceof: {
446 if (VM_Version::profile_all_receivers_at_type_check()) {
447 return (c < 0 ? max_jint : c); // always non-negative
448 }
449 return (c > 0 ? min_jint : c); // always non-positive
450 }
451 default: {
452 assert(Bytecodes::is_invoke(code), "%s", Bytecodes::name(code));
453 return (c < 0 ? max_jint : c); // always non-negative
454 }
455 }
456 }
457
458
459 // ------------------------------------------------------------------
460 // ciMethod::call_profile_at_bci
461 //
462 // Get the ciCallProfile for the invocation of this method.
463 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
464 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
465 ResourceMark rm;
466 ciCallProfile result;
467 if (method_data() != nullptr && method_data()->is_mature()) {
468 ciProfileData* data = method_data()->bci_to_data(bci);
469 if (data != nullptr && data->is_CounterData()) {
470 // Every profiled call site has a counter.
471 int count = check_overflow(data->as_CounterData()->count(), java_code_at_bci(bci));
472
473 if (!data->is_ReceiverTypeData()) {
474 result._receiver_count[0] = 0; // that's a definite zero
475 } else { // ReceiverTypeData is a subclass of CounterData
476 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
477 // In addition, virtual call sites have receiver type information
478 int receivers_count_total = 0;
479 int morphism = 0;
480 // Precompute morphism for the possible fixup
481 for (uint i = 0; i < call->row_limit(); i++) {
482 ciKlass* receiver = call->receiver(i);
483 if (receiver == nullptr) continue;
484 morphism++;
485 }
486 int epsilon = 0;
487 // For a call, it is assumed that either the type of the receiver(s)
488 // is recorded or an associated counter is incremented, but not both. With
489 // tiered compilation, however, both can happen due to the interpreter and
490 // C1 profiling invocations differently. Address that inconsistency here.
491 if (morphism == 1 && count > 0) {
492 epsilon = count;
493 count = 0;
494 }
495 for (uint i = 0; i < call->row_limit(); i++) {
496 ciKlass* receiver = call->receiver(i);
497 if (receiver == nullptr) continue;
498 int rcount = saturated_add(call->receiver_count(i), epsilon);
499 if (rcount == 0) rcount = 1; // Should be valid value
500 receivers_count_total = saturated_add(receivers_count_total, rcount);
501 // Add the receiver to result data.
502 result.add_receiver(receiver, rcount);
503 // If we extend profiling to record methods,
504 // we will set result._method also.
505 }
506 // Determine call site's morphism.
507 // The call site count is 0 with known morphism (only 1 or 2 receivers)
508 // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
509 // The call site count is > 0 in the case of a polymorphic virtual call.
510 if (morphism > 0 && morphism == result._limit) {
511 // The morphism <= MorphismLimit.
512 if ((morphism < ciCallProfile::MorphismLimit) ||
513 (morphism == ciCallProfile::MorphismLimit && count == 0)) {
514 #ifdef ASSERT
515 if (count > 0) {
516 this->print_short_name(tty);
517 tty->print_cr(" @ bci:%d", bci);
518 this->print_codes();
519 assert(false, "this call site should not be polymorphic");
520 }
521 #endif
522 result._morphism = morphism;
523 }
524 }
525 // Make the count consistent if this is a call profile. If count is
526 // zero or less, presume that this is a typecheck profile and
527 // do nothing. Otherwise, increase count to be the sum of all
528 // receiver's counts.
529 if (count >= 0) {
530 count = saturated_add(count, receivers_count_total);
531 }
532 }
533 result._count = count;
534 }
535 }
536 return result;
537 }
538
539 // ------------------------------------------------------------------
540 // Add new receiver and sort data by receiver's profile count.
541 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
542 // Add new receiver and sort data by receiver's counts when we have space
543 // for it otherwise replace the less called receiver (less called receiver
544 // is placed to the last array element which is not used).
545 // First array's element contains most called receiver.
546 int i = _limit;
547 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
548 _receiver[i] = _receiver[i-1];
549 _receiver_count[i] = _receiver_count[i-1];
550 }
551 _receiver[i] = receiver;
552 _receiver_count[i] = receiver_count;
553 if (_limit < MorphismLimit) _limit++;
554 }
555
556
557 void ciMethod::assert_virtual_call_type_ok(int bci) {
558 assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
559 java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
560 }
561
562 void ciMethod::assert_call_type_ok(int bci) {
563 assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
564 java_code_at_bci(bci) == Bytecodes::_invokespecial ||
565 java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
566 }
567
568 /**
569 * Check whether profiling provides a type for the argument i to the
570 * call at bci bci
571 *
572 * @param [in]bci bci of the call
573 * @param [in]i argument number
574 * @param [out]type profiled type of argument, null if none
575 * @param [out]ptr_kind whether always null, never null or maybe null
576 * @return true if profiling exists
577 *
578 */
579 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
580 if (MethodData::profile_parameters() && method_data() != nullptr && method_data()->is_mature()) {
581 ciProfileData* data = method_data()->bci_to_data(bci);
582 if (data != nullptr) {
583 if (data->is_VirtualCallTypeData()) {
584 assert_virtual_call_type_ok(bci);
585 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
586 if (i >= call->number_of_arguments()) {
587 return false;
588 }
589 type = call->valid_argument_type(i);
590 ptr_kind = call->argument_ptr_kind(i);
591 return true;
592 } else if (data->is_CallTypeData()) {
593 assert_call_type_ok(bci);
594 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
595 if (i >= call->number_of_arguments()) {
596 return false;
597 }
598 type = call->valid_argument_type(i);
599 ptr_kind = call->argument_ptr_kind(i);
600 return true;
601 }
602 }
603 }
604 return false;
605 }
606
607 /**
608 * Check whether profiling provides a type for the return value from
609 * the call at bci bci
610 *
611 * @param [in]bci bci of the call
612 * @param [out]type profiled type of argument, null if none
613 * @param [out]ptr_kind whether always null, never null or maybe null
614 * @return true if profiling exists
615 *
616 */
617 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
618 if (MethodData::profile_return() && method_data() != nullptr && method_data()->is_mature()) {
619 ciProfileData* data = method_data()->bci_to_data(bci);
620 if (data != nullptr) {
621 if (data->is_VirtualCallTypeData()) {
622 assert_virtual_call_type_ok(bci);
623 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
624 if (call->has_return()) {
625 type = call->valid_return_type();
626 ptr_kind = call->return_ptr_kind();
627 return true;
628 }
629 } else if (data->is_CallTypeData()) {
630 assert_call_type_ok(bci);
631 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
632 if (call->has_return()) {
633 type = call->valid_return_type();
634 ptr_kind = call->return_ptr_kind();
635 }
636 return true;
637 }
638 }
639 }
640 return false;
641 }
642
643 /**
644 * Check whether profiling provides a type for the parameter i
645 *
646 * @param [in]i parameter number
647 * @param [out]type profiled type of parameter, null if none
648 * @param [out]ptr_kind whether always null, never null or maybe null
649 * @return true if profiling exists
650 *
651 */
652 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
653 if (MethodData::profile_parameters() && method_data() != nullptr && method_data()->is_mature()) {
654 ciParametersTypeData* parameters = method_data()->parameters_type_data();
655 if (parameters != nullptr && i < parameters->number_of_parameters()) {
656 type = parameters->valid_parameter_type(i);
657 ptr_kind = parameters->parameter_ptr_kind(i);
658 return true;
659 }
660 }
661 return false;
662 }
663
664
665 // ------------------------------------------------------------------
666 // ciMethod::find_monomorphic_target
667 //
668 // Given a certain calling environment, find the monomorphic target
669 // for the call. Return null if the call is not monomorphic in
670 // its calling environment, or if there are only abstract methods.
671 // The returned method is never abstract.
672 // Note: If caller uses a non-null result, it must inform dependencies
673 // via assert_unique_concrete_method or assert_leaf_type.
674 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
675 ciInstanceKlass* callee_holder,
676 ciInstanceKlass* actual_recv,
677 bool check_access) {
678 check_is_loaded();
679
680 if (actual_recv->is_interface()) {
681 // %%% We cannot trust interface types, yet. See bug 6312651.
682 return nullptr;
683 }
684
685 ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access, true /* allow_abstract */);
686 if (root_m == nullptr) {
687 // Something went wrong looking up the actual receiver method.
688 return nullptr;
689 }
690
691 // Make certain quick checks even if UseCHA is false.
692
693 // Is it private or final?
694 if (root_m->can_be_statically_bound()) {
695 assert(!root_m->is_abstract(), "sanity");
696 return root_m;
697 }
698
699 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
700 // Easy case. There is no other place to put a method, so don't bother
701 // to go through the VM_ENTRY_MARK and all the rest.
702 if (root_m->is_abstract()) {
703 return nullptr;
704 }
705 return root_m;
706 }
707
708 // Array methods (clone, hashCode, etc.) are always statically bound.
709 // If we were to see an array type here, we'd return root_m.
710 // However, this method processes only ciInstanceKlasses. (See 4962591.)
711 // The inline_native_clone intrinsic narrows Object to T[] properly,
712 // so there is no need to do the same job here.
713
714 if (!UseCHA) return nullptr;
715
716 VM_ENTRY_MARK;
717
718 methodHandle target;
719 {
720 MutexLocker locker(Compile_lock);
721 InstanceKlass* context = actual_recv->get_instanceKlass();
722 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context,
723 root_m->get_Method(),
724 callee_holder->get_Klass(),
725 this->get_Method()));
726 assert(target() == nullptr || !target()->is_abstract(), "not allowed");
727 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
728 }
729
730 #ifndef PRODUCT
731 LogTarget(Debug, dependencies) lt;
732 if (lt.is_enabled() && target() != nullptr && target() != root_m->get_Method()) {
733 LogStream ls(<);
734 ls.print("found a non-root unique target method");
735 ls.print_cr(" context = %s", actual_recv->get_Klass()->external_name());
736 ls.print(" method = ");
737 target->print_short_name(&ls);
738 ls.cr();
739 }
740 #endif //PRODUCT
741
742 if (target() == nullptr) {
743 return nullptr;
744 }
745 if (target() == root_m->get_Method()) {
746 return root_m;
747 }
748 if (!root_m->is_public() &&
749 !root_m->is_protected()) {
750 // If we are going to reason about inheritance, it's easiest
751 // if the method in question is public, protected, or private.
752 // If the answer is not root_m, it is conservatively correct
753 // to return null, even if the CHA encountered irrelevant
754 // methods in other packages.
755 // %%% TO DO: Work out logic for package-private methods
756 // with the same name but different vtable indexes.
757 return nullptr;
758 }
759 return CURRENT_THREAD_ENV->get_method(target());
760 }
761
762 // ------------------------------------------------------------------
763 // ciMethod::can_be_statically_bound
764 //
765 // Tries to determine whether a method can be statically bound in some context.
766 bool ciMethod::can_be_statically_bound(ciInstanceKlass* context) const {
767 return (holder() == context) && can_be_statically_bound();
768 }
769
770 // ------------------------------------------------------------------
771 // ciMethod::can_omit_stack_trace
772 //
773 // Tries to determine whether a method can omit stack trace in throw in compiled code.
774 bool ciMethod::can_omit_stack_trace() const {
775 if (!StackTraceInThrowable) {
776 return true; // stack trace is switched off.
777 }
778 if (!OmitStackTraceInFastThrow) {
779 return false; // Have to provide stack trace.
780 }
781 return _can_omit_stack_trace;
782 }
783
784 // ------------------------------------------------------------------
785 // ciMethod::equals
786 //
787 // Returns true if the methods are the same, taking redefined methods
788 // into account.
789 bool ciMethod::equals(const ciMethod* m) const {
790 if (this == m) return true;
791 VM_ENTRY_MARK;
792 Method* m1 = this->get_Method();
793 Method* m2 = m->get_Method();
794 if (m1->is_old()) m1 = m1->get_new_method();
795 if (m2->is_old()) m2 = m2->get_new_method();
796 return m1 == m2;
797 }
798
799
800 // ------------------------------------------------------------------
801 // ciMethod::resolve_invoke
802 //
803 // Given a known receiver klass, find the target for the call.
804 // Return null if the call has no target or the target is abstract.
805 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access, bool allow_abstract) {
806 check_is_loaded();
807 VM_ENTRY_MARK;
808
809 Klass* caller_klass = caller->get_Klass();
810 Klass* recv = exact_receiver->get_Klass();
811 Klass* resolved = holder()->get_Klass();
812 Symbol* h_name = name()->get_symbol();
813 Symbol* h_signature = signature()->get_symbol();
814
815 LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
816 check_access ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
817 check_access ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
818 Method* m = nullptr;
819 // Only do exact lookup if receiver klass has been linked. Otherwise,
820 // the vtable has not been setup, and the LinkResolver will fail.
821 if (recv->is_array_klass()
822 ||
823 (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
824 if (holder()->is_interface()) {
825 m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
826 } else {
827 m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
828 }
829 }
830
831 if (m == nullptr) {
832 // Return null only if there was a problem with lookup (uninitialized class, etc.)
833 return nullptr;
834 }
835
836 ciMethod* result = this;
837 if (m != get_Method()) {
838 result = CURRENT_THREAD_ENV->get_method(m);
839 }
840
841 if (result->is_abstract() && !allow_abstract) {
842 // Don't return abstract methods because they aren't optimizable or interesting.
843 return nullptr;
844 }
845 return result;
846 }
847
848 // ------------------------------------------------------------------
849 // ciMethod::resolve_vtable_index
850 //
851 // Given a known receiver klass, find the vtable index for the call.
852 // Return Method::invalid_vtable_index if the vtable_index is unknown.
853 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
854 check_is_loaded();
855
856 int vtable_index = Method::invalid_vtable_index;
857 // Only do lookup if receiver klass has been linked. Otherwise,
858 // the vtable has not been setup, and the LinkResolver will fail.
859 if (!receiver->is_interface()
860 && (!receiver->is_instance_klass() ||
861 receiver->as_instance_klass()->is_linked())) {
862 VM_ENTRY_MARK;
863
864 Klass* caller_klass = caller->get_Klass();
865 Klass* recv = receiver->get_Klass();
866 Symbol* h_name = name()->get_symbol();
867 Symbol* h_signature = signature()->get_symbol();
868
869 LinkInfo link_info(recv, h_name, h_signature, caller_klass);
870 vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
871 if (vtable_index == Method::nonvirtual_vtable_index) {
872 // A statically bound method. Return "no such index".
873 vtable_index = Method::invalid_vtable_index;
874 }
875 }
876
877 return vtable_index;
878 }
879
880 // ------------------------------------------------------------------
881 // ciMethod::get_field_at_bci
882 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
883 ciBytecodeStream iter(this);
884 iter.reset_to_bci(bci);
885 iter.next();
886 return iter.get_field(will_link);
887 }
888
889 // ------------------------------------------------------------------
890 // ciMethod::get_method_at_bci
891 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
892 ciBytecodeStream iter(this);
893 iter.reset_to_bci(bci);
894 iter.next();
895 return iter.get_method(will_link, declared_signature);
896 }
897
898 // ------------------------------------------------------------------
899 ciKlass* ciMethod::get_declared_method_holder_at_bci(int bci) {
900 ciBytecodeStream iter(this);
901 iter.reset_to_bci(bci);
902 iter.next();
903 return iter.get_declared_method_holder();
904 }
905
906 // ------------------------------------------------------------------
907 // Adjust a CounterData count to be commensurate with
908 // interpreter_invocation_count. If the MDO exists for
909 // only 25% of the time the method exists, then the
910 // counts in the MDO should be scaled by 4X, so that
911 // they can be usefully and stably compared against the
912 // invocation counts in methods.
913 int ciMethod::scale_count(int count, float prof_factor) {
914 if (count > 0 && method_data() != nullptr) {
915 int counter_life = method_data()->invocation_count();
916 int method_life = interpreter_invocation_count();
917 if (method_life < counter_life) { // may happen because of the snapshot timing
918 method_life = counter_life;
919 }
920 if (counter_life > 0) {
921 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
922 count = (count > 0) ? count : 1;
923 } else {
924 count = 1;
925 }
926 }
927 return count;
928 }
929
930
931 // ------------------------------------------------------------------
932 // ciMethod::is_special_get_caller_class_method
933 //
934 bool ciMethod::is_ignored_by_security_stack_walk() const {
935 check_is_loaded();
936 VM_ENTRY_MARK;
937 return get_Method()->is_ignored_by_security_stack_walk();
938 }
939
940 // ------------------------------------------------------------------
941 // ciMethod::needs_clinit_barrier
942 //
943 bool ciMethod::needs_clinit_barrier() const {
944 check_is_loaded();
945 return is_static() && !holder()->is_initialized();
946 }
947
948 // ------------------------------------------------------------------
949 // invokedynamic support
950
951 // ------------------------------------------------------------------
952 // ciMethod::is_method_handle_intrinsic
953 //
954 // Return true if the method is an instance of the JVM-generated
955 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
956 bool ciMethod::is_method_handle_intrinsic() const {
957 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
958 return (MethodHandles::is_signature_polymorphic(iid) &&
959 MethodHandles::is_signature_polymorphic_intrinsic(iid));
960 }
961
962 // ------------------------------------------------------------------
963 // ciMethod::is_compiled_lambda_form
964 //
965 // Return true if the method is a generated MethodHandle adapter.
966 // These are built by Java code.
967 bool ciMethod::is_compiled_lambda_form() const {
968 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
969 return iid == vmIntrinsics::_compiledLambdaForm;
970 }
971
972 // ------------------------------------------------------------------
973 // ciMethod::is_object_initializer
974 //
975 bool ciMethod::is_object_initializer() const {
976 return name() == ciSymbols::object_initializer_name();
977 }
978
979 // ------------------------------------------------------------------
980 // ciMethod::is_scoped
981 //
982 // Return true for methods annotated with @Scoped
983 bool ciMethod::is_scoped() const {
984 return get_Method()->is_scoped();
985 }
986
987 // ------------------------------------------------------------------
988 // ciMethod::has_member_arg
989 //
990 // Return true if the method is a linker intrinsic like _linkToVirtual.
991 // These are built by the JVM.
992 bool ciMethod::has_member_arg() const {
993 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
994 return (MethodHandles::is_signature_polymorphic(iid) &&
995 MethodHandles::has_member_arg(iid));
996 }
997
998 // ------------------------------------------------------------------
999 // ciMethod::ensure_method_data
1000 //
1001 // Generate new MethodData* objects at compile time.
1002 // Return true if allocation was successful or no MDO is required.
1003 bool ciMethod::ensure_method_data(const methodHandle& h_m) {
1004 EXCEPTION_CONTEXT;
1005 if (is_native() || is_abstract() || h_m()->is_accessor()) {
1006 return true;
1007 }
1008 if (h_m()->method_data() == nullptr) {
1009 Method::build_profiling_method_data(h_m, THREAD);
1010 if (HAS_PENDING_EXCEPTION) {
1011 CLEAR_PENDING_EXCEPTION;
1012 }
1013 }
1014 if (h_m()->method_data() != nullptr) {
1015 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1016 return _method_data->load_data();
1017 } else {
1018 _method_data = CURRENT_ENV->get_empty_methodData();
1019 return false;
1020 }
1021 }
1022
1023 // public, retroactive version
1024 bool ciMethod::ensure_method_data() {
1025 bool result = true;
1026 if (_method_data == nullptr || _method_data->is_empty()) {
1027 GUARDED_VM_ENTRY({
1028 methodHandle mh(Thread::current(), get_Method());
1029 result = ensure_method_data(mh);
1030 });
1031 }
1032 return result;
1033 }
1034
1035
1036 // ------------------------------------------------------------------
1037 // ciMethod::method_data
1038 //
1039 ciMethodData* ciMethod::method_data() {
1040 if (_method_data != nullptr) {
1041 return _method_data;
1042 }
1043 VM_ENTRY_MARK;
1044 ciEnv* env = CURRENT_ENV;
1045 Thread* my_thread = JavaThread::current();
1046 methodHandle h_m(my_thread, get_Method());
1047
1048 if (h_m()->method_data() != nullptr) {
1049 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1050 _method_data->load_data();
1051 } else {
1052 _method_data = CURRENT_ENV->get_empty_methodData();
1053 }
1054 return _method_data;
1055
1056 }
1057
1058 // ------------------------------------------------------------------
1059 // ciMethod::method_data_or_null
1060 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1061 // null otherwise.
1062 ciMethodData* ciMethod::method_data_or_null() {
1063 ciMethodData *md = method_data();
1064 if (md->is_empty()) {
1065 return nullptr;
1066 }
1067 return md;
1068 }
1069
1070 // ------------------------------------------------------------------
1071 // ciMethod::ensure_method_counters
1072 //
1073 MethodCounters* ciMethod::ensure_method_counters() {
1074 check_is_loaded();
1075 VM_ENTRY_MARK;
1076 methodHandle mh(THREAD, get_Method());
1077 MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1078 return method_counters;
1079 }
1080
1081 // ------------------------------------------------------------------
1082 // ciMethod::has_option
1083 //
1084 bool ciMethod::has_option(CompileCommandEnum option) {
1085 check_is_loaded();
1086 VM_ENTRY_MARK;
1087 methodHandle mh(THREAD, get_Method());
1088 return CompilerOracle::has_option(mh, option);
1089 }
1090
1091 // ------------------------------------------------------------------
1092 // ciMethod::has_option_value
1093 //
1094 bool ciMethod::has_option_value(CompileCommandEnum option, double& value) {
1095 check_is_loaded();
1096 VM_ENTRY_MARK;
1097 methodHandle mh(THREAD, get_Method());
1098 return CompilerOracle::has_option_value(mh, option, value);
1099 }
1100 // ------------------------------------------------------------------
1101 // ciMethod::can_be_compiled
1102 //
1103 // Have previous compilations of this method succeeded?
1104 bool ciMethod::can_be_compiled() {
1105 check_is_loaded();
1106 ciEnv* env = CURRENT_ENV;
1107 if (is_c1_compile(env->comp_level())) {
1108 return _is_c1_compilable;
1109 }
1110 return _is_c2_compilable;
1111 }
1112
1113 // ------------------------------------------------------------------
1114 // ciMethod::has_compiled_code
1115 bool ciMethod::has_compiled_code() {
1116 return inline_instructions_size() > 0;
1117 }
1118
1119 int ciMethod::highest_osr_comp_level() {
1120 check_is_loaded();
1121 VM_ENTRY_MARK;
1122 return get_Method()->highest_osr_comp_level();
1123 }
1124
1125 // ------------------------------------------------------------------
1126 // ciMethod::code_size_for_inlining
1127 //
1128 // Code size for inlining decisions. This method returns a code
1129 // size of 1 for methods which has the ForceInline annotation.
1130 int ciMethod::code_size_for_inlining() {
1131 check_is_loaded();
1132 if (get_Method()->force_inline()) {
1133 return 1;
1134 }
1135 return code_size();
1136 }
1137
1138 // ------------------------------------------------------------------
1139 // ciMethod::inline_instructions_size
1140 //
1141 // This is a rough metric for "fat" methods, compared before inlining
1142 // with InlineSmallCode. The CodeBlob::code_size accessor includes
1143 // junk like exception handler, stubs, and constant table, which are
1144 // not highly relevant to an inlined method. So we use the more
1145 // specific accessor nmethod::insts_size.
1146 // Also some instructions inside the code are excluded from inline
1147 // heuristic (e.g. post call nop instructions; see InlineSkippedInstructionsCounter)
1148 int ciMethod::inline_instructions_size() {
1149 if (_inline_instructions_size == -1) {
1150 GUARDED_VM_ENTRY(
1151 nmethod* code = get_Method()->code();
1152 if (code != nullptr && (code->comp_level() == CompLevel_full_optimization)) {
1153 int isize = code->insts_end() - code->verified_entry_point() - code->skipped_instructions_size();
1154 _inline_instructions_size = isize > 0 ? isize : 0;
1155 } else {
1156 _inline_instructions_size = 0;
1157 }
1158 );
1159 }
1160 return _inline_instructions_size;
1161 }
1162
1163 // ------------------------------------------------------------------
1164 // ciMethod::log_nmethod_identity
1165 void ciMethod::log_nmethod_identity(xmlStream* log) {
1166 GUARDED_VM_ENTRY(
1167 nmethod* code = get_Method()->code();
1168 if (code != nullptr) {
1169 code->log_identity(log);
1170 }
1171 )
1172 }
1173
1174 // ------------------------------------------------------------------
1175 // ciMethod::is_not_reached
1176 bool ciMethod::is_not_reached(int bci) {
1177 check_is_loaded();
1178 VM_ENTRY_MARK;
1179 return Interpreter::is_not_reached(
1180 methodHandle(THREAD, get_Method()), bci);
1181 }
1182
1183 // ------------------------------------------------------------------
1184 // ciMethod::was_never_executed
1185 bool ciMethod::was_executed_more_than(int times) {
1186 VM_ENTRY_MARK;
1187 return get_Method()->was_executed_more_than(times);
1188 }
1189
1190 // ------------------------------------------------------------------
1191 // ciMethod::has_unloaded_classes_in_signature
1192 bool ciMethod::has_unloaded_classes_in_signature() {
1193 // ciSignature is resolved against some accessing class and
1194 // signature classes aren't required to be local. As a benefit,
1195 // it makes signature classes visible through loader constraints.
1196 // So, encountering an unloaded class signals it is absent both in
1197 // the callee (local) and caller contexts.
1198 return signature()->has_unloaded_classes();
1199 }
1200
1201 // ------------------------------------------------------------------
1202 // ciMethod::is_klass_loaded
1203 bool ciMethod::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1204 VM_ENTRY_MARK;
1205 return get_Method()->is_klass_loaded(refinfo_index, bc, must_be_resolved);
1206 }
1207
1208 // ------------------------------------------------------------------
1209 // ciMethod::check_call
1210 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1211 // This method is used only in C2 from InlineTree::ok_to_inline,
1212 // and is only used under -Xcomp.
1213 // It appears to fail when applied to an invokeinterface call site.
1214 // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1215 VM_ENTRY_MARK;
1216 {
1217 ExceptionMark em(THREAD);
1218 HandleMark hm(THREAD);
1219 constantPoolHandle pool (THREAD, get_Method()->constants());
1220 Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1221 Method* spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1222 if (HAS_PENDING_EXCEPTION) {
1223 CLEAR_PENDING_EXCEPTION;
1224 return false;
1225 } else {
1226 return (spec_method->is_static() == is_static);
1227 }
1228 }
1229 return false;
1230 }
1231 // ------------------------------------------------------------------
1232 // ciMethod::print_codes
1233 //
1234 // Print the bytecodes for this method.
1235 void ciMethod::print_codes_on(outputStream* st) {
1236 check_is_loaded();
1237 GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1238 }
1239
1240
1241 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1242 check_is_loaded(); \
1243 VM_ENTRY_MARK; \
1244 return get_Method()->flag_accessor(); \
1245 }
1246
1247 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1248 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1249 bool ciMethod::is_getter () const { FETCH_FLAG_FROM_VM(is_getter); }
1250 bool ciMethod::is_setter () const { FETCH_FLAG_FROM_VM(is_setter); }
1251 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1252 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); }
1253 bool ciMethod::is_empty () const { FETCH_FLAG_FROM_VM(is_empty_method); }
1254
1255 bool ciMethod::is_boxing_method() const {
1256 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1257 switch (intrinsic_id()) {
1258 case vmIntrinsics::_Boolean_valueOf:
1259 case vmIntrinsics::_Byte_valueOf:
1260 case vmIntrinsics::_Character_valueOf:
1261 case vmIntrinsics::_Short_valueOf:
1262 case vmIntrinsics::_Integer_valueOf:
1263 case vmIntrinsics::_Long_valueOf:
1264 case vmIntrinsics::_Float_valueOf:
1265 case vmIntrinsics::_Double_valueOf:
1266 return true;
1267 default:
1268 return false;
1269 }
1270 }
1271 return false;
1272 }
1273
1274 bool ciMethod::is_unboxing_method() const {
1275 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1276 switch (intrinsic_id()) {
1277 case vmIntrinsics::_booleanValue:
1278 case vmIntrinsics::_byteValue:
1279 case vmIntrinsics::_charValue:
1280 case vmIntrinsics::_shortValue:
1281 case vmIntrinsics::_intValue:
1282 case vmIntrinsics::_longValue:
1283 case vmIntrinsics::_floatValue:
1284 case vmIntrinsics::_doubleValue:
1285 return true;
1286 default:
1287 return false;
1288 }
1289 }
1290 return false;
1291 }
1292
1293 bool ciMethod::is_vector_method() const {
1294 return (holder() == ciEnv::current()->vector_VectorSupport_klass()) &&
1295 (intrinsic_id() != vmIntrinsics::_none);
1296 }
1297
1298 BCEscapeAnalyzer *ciMethod::get_bcea() {
1299 #ifdef COMPILER2
1300 if (_bcea == nullptr) {
1301 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, nullptr);
1302 }
1303 return _bcea;
1304 #else // COMPILER2
1305 ShouldNotReachHere();
1306 return nullptr;
1307 #endif // COMPILER2
1308 }
1309
1310 ciMethodBlocks *ciMethod::get_method_blocks() {
1311 if (_method_blocks == nullptr) {
1312 Arena *arena = CURRENT_ENV->arena();
1313 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1314 }
1315 return _method_blocks;
1316 }
1317
1318 #undef FETCH_FLAG_FROM_VM
1319
1320 void ciMethod::dump_name_as_ascii(outputStream* st, Method* method) {
1321 st->print("%s %s %s",
1322 CURRENT_ENV->replay_name(method->method_holder()),
1323 method->name()->as_quoted_ascii(),
1324 method->signature()->as_quoted_ascii());
1325 }
1326
1327 void ciMethod::dump_name_as_ascii(outputStream* st) {
1328 Method* method = get_Method();
1329 dump_name_as_ascii(st, method);
1330 }
1331
1332 void ciMethod::dump_replay_data(outputStream* st) {
1333 ResourceMark rm;
1334 Method* method = get_Method();
1335 if (MethodHandles::is_signature_polymorphic_method(method)) {
1336 // ignore for now
1337 return;
1338 }
1339 MethodCounters* mcs = method->method_counters();
1340 st->print("ciMethod ");
1341 dump_name_as_ascii(st);
1342 st->print_cr(" %d %d %d %d %d",
1343 mcs == nullptr ? 0 : mcs->invocation_counter()->raw_counter(),
1344 mcs == nullptr ? 0 : mcs->backedge_counter()->raw_counter(),
1345 interpreter_invocation_count(),
1346 interpreter_throwout_count(),
1347 _inline_instructions_size);
1348 }
1349
1350 // ------------------------------------------------------------------
1351 // ciMethod::print_codes
1352 //
1353 // Print a range of the bytecodes for this method.
1354 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1355 check_is_loaded();
1356 GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1357 }
1358
1359 // ------------------------------------------------------------------
1360 // ciMethod::print_name
1361 //
1362 // Print the name of this method, including signature and some flags.
1363 void ciMethod::print_name(outputStream* st) {
1364 check_is_loaded();
1365 GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1366 }
1367
1368 // ------------------------------------------------------------------
1369 // ciMethod::print_short_name
1370 //
1371 // Print the name of this method, without signature.
1372 void ciMethod::print_short_name(outputStream* st) {
1373 if (is_loaded()) {
1374 GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1375 } else {
1376 // Fall back if method is not loaded.
1377 holder()->print_name_on(st);
1378 st->print("::");
1379 name()->print_symbol_on(st);
1380 if (WizardMode)
1381 signature()->as_symbol()->print_symbol_on(st);
1382 }
1383 }
1384
1385 // ------------------------------------------------------------------
1386 // ciMethod::print_impl
1387 //
1388 // Implementation of the print method.
1389 void ciMethod::print_impl(outputStream* st) {
1390 ciMetadata::print_impl(st);
1391 st->print(" name=");
1392 name()->print_symbol_on(st);
1393 st->print(" holder=");
1394 holder()->print_name_on(st);
1395 st->print(" signature=");
1396 signature()->as_symbol()->print_symbol_on(st);
1397 if (is_loaded()) {
1398 st->print(" loaded=true");
1399 st->print(" arg_size=%d", arg_size());
1400 st->print(" flags=");
1401 flags().print_member_flags(st);
1402 } else {
1403 st->print(" loaded=false");
1404 }
1405 }
1406
1407 // ------------------------------------------------------------------
1408
1409 static BasicType erase_to_word_type(BasicType bt) {
1410 if (is_subword_type(bt)) return T_INT;
1411 if (is_reference_type(bt)) return T_OBJECT;
1412 return bt;
1413 }
1414
1415 static bool basic_types_match(ciType* t1, ciType* t2) {
1416 if (t1 == t2) return true;
1417 return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1418 }
1419
1420 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1421 bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1422 !resolved_method->is_method_handle_intrinsic();
1423
1424 if (!invoke_through_mh_intrinsic) {
1425 // Method name & descriptor should stay the same.
1426 // Signatures may reference unloaded types and thus they may be not strictly equal.
1427 ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1428 ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1429
1430 return (declared_method->name()->equals(resolved_method->name())) &&
1431 (declared_signature->equals(resolved_signature));
1432 }
1433
1434 ciMethod* linker = declared_method;
1435 ciMethod* target = resolved_method;
1436 // Linkers have appendix argument which is not passed to callee.
1437 int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1438 if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1439 return false; // argument slot count mismatch
1440 }
1441
1442 ciSignature* linker_sig = linker->signature();
1443 ciSignature* target_sig = target->signature();
1444
1445 if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1446 target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1447 return false; // argument count mismatch
1448 }
1449
1450 int sbase = 0, rbase = 0;
1451 switch (linker->intrinsic_id()) {
1452 case vmIntrinsics::_linkToVirtual:
1453 case vmIntrinsics::_linkToInterface:
1454 case vmIntrinsics::_linkToSpecial: {
1455 if (target->is_static()) {
1456 return false;
1457 }
1458 if (linker_sig->type_at(0)->is_primitive_type()) {
1459 return false; // receiver should be an oop
1460 }
1461 sbase = 1; // skip receiver
1462 break;
1463 }
1464 case vmIntrinsics::_linkToStatic: {
1465 if (!target->is_static()) {
1466 return false;
1467 }
1468 break;
1469 }
1470 case vmIntrinsics::_invokeBasic: {
1471 if (target->is_static()) {
1472 if (target_sig->type_at(0)->is_primitive_type()) {
1473 return false; // receiver should be an oop
1474 }
1475 rbase = 1; // skip receiver
1476 }
1477 break;
1478 }
1479 default:
1480 break;
1481 }
1482 assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1483 int arg_count = target_sig->count() - rbase;
1484 for (int i = 0; i < arg_count; i++) {
1485 if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1486 return false;
1487 }
1488 }
1489 // Only check the return type if the symbolic info has non-void return type.
1490 // I.e. the return value of the resolved method can be dropped.
1491 if (!linker->return_type()->is_void() &&
1492 !basic_types_match(linker->return_type(), target->return_type())) {
1493 return false;
1494 }
1495 return true; // no mismatch found
1496 }
1497
1498 // ------------------------------------------------------------------