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 "cds/aotLinkedClassBulkLoader.hpp"
27 #include "ci/ciCallProfile.hpp"
28 #include "ci/ciExceptionHandler.hpp"
29 #include "ci/ciInstanceKlass.hpp"
30 #include "ci/ciMethod.hpp"
31 #include "ci/ciMethodBlocks.hpp"
32 #include "ci/ciMethodData.hpp"
33 #include "ci/ciStreams.hpp"
34 #include "ci/ciSymbol.hpp"
35 #include "ci/ciReplay.hpp"
36 #include "ci/ciSymbols.hpp"
37 #include "ci/ciUtilities.inline.hpp"
38 #include "compiler/compileTask.hpp"
39 #include "compiler/abstractCompiler.hpp"
40 #include "compiler/compilerDefinitions.inline.hpp"
41 #include "compiler/compilerOracle.hpp"
42 #include "compiler/methodLiveness.hpp"
43 #include "interpreter/interpreter.hpp"
44 #include "interpreter/linkResolver.hpp"
45 #include "interpreter/oopMapCache.hpp"
46 #include "logging/log.hpp"
47 #include "logging/logStream.hpp"
48 #include "memory/allocation.inline.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "oops/generateOopMap.hpp"
51 #include "oops/method.inline.hpp"
52 #include "oops/oop.inline.hpp"
53 #include "oops/trainingData.hpp"
54 #include "prims/methodHandles.hpp"
55 #include "runtime/deoptimization.hpp"
56 #include "runtime/handles.inline.hpp"
57 #include "utilities/bitMap.inline.hpp"
58 #include "utilities/xmlstream.hpp"
59 #ifdef COMPILER2
60 #include "ci/bcEscapeAnalyzer.hpp"
61 #include "ci/ciTypeFlow.hpp"
62 #include "oops/method.hpp"
63 #endif
64
65 // ciMethod
66 //
67 // This class represents a Method* in the HotSpot virtual
68 // machine.
69
70
71 // ------------------------------------------------------------------
72 // ciMethod::ciMethod
73 //
74 // Loaded method.
75 ciMethod::ciMethod(const methodHandle& h_m, ciInstanceKlass* holder) :
76 ciMetadata(h_m()),
77 _holder(holder)
78 {
79 assert(h_m() != nullptr, "no null method");
80 assert(_holder->get_instanceKlass() == h_m->method_holder(), "");
81
82 // These fields are always filled in in loaded methods.
83 _flags = ciFlags(h_m->access_flags());
84
85 // Easy to compute, so fill them in now.
86 _max_stack = h_m->max_stack();
87 _max_locals = h_m->max_locals();
88 _code_size = h_m->code_size();
89 _handler_count = h_m->exception_table_length();
90 _size_of_parameters = h_m->size_of_parameters();
91 _uses_monitors = h_m->has_monitor_bytecodes();
92 _balanced_monitors = !_uses_monitors || h_m->guaranteed_monitor_matching();
93 _is_c1_compilable = !h_m->is_not_c1_compilable();
94 _is_c2_compilable = !h_m->is_not_c2_compilable();
95 _can_be_parsed = true;
96 _has_reserved_stack_access = h_m->has_reserved_stack_access();
97 _is_overpass = h_m->is_overpass();
98 // Lazy fields, filled in on demand. Require allocation.
99 _code = nullptr;
100 _exception_handlers = nullptr;
101 _liveness = nullptr;
102 _method_blocks = nullptr;
103 #if defined(COMPILER2)
104 _flow = nullptr;
105 _bcea = nullptr;
106 #endif // COMPILER2
107
108 // Check for blackhole intrinsic and then populate the intrinsic ID.
109 CompilerOracle::tag_blackhole_if_possible(h_m);
110 _intrinsic_id = h_m->intrinsic_id();
111
112 ciEnv *env = CURRENT_ENV;
113 if (env->jvmti_can_hotswap_or_post_breakpoint()) {
114 // 6328518 check hotswap conditions under the right lock.
115 bool should_take_Compile_lock = !Compile_lock->owned_by_self();
116 ConditionalMutexLocker locker(Compile_lock, should_take_Compile_lock, Mutex::_safepoint_check_flag);
117 if (Dependencies::check_evol_method(h_m()) != nullptr) {
118 _is_c1_compilable = false;
119 _is_c2_compilable = false;
120 _can_be_parsed = false;
121 }
122 } else {
123 DEBUG_ONLY(CompilerThread::current()->check_possible_safepoint());
124 }
125
126 if (h_m->method_holder()->is_linked()) {
127 _can_be_statically_bound = h_m->can_be_statically_bound();
128 _can_omit_stack_trace = h_m->can_omit_stack_trace();
129 } else {
130 // Have to use a conservative value in this case.
131 _can_be_statically_bound = false;
132 _can_omit_stack_trace = true;
133 }
134
135 // Adjust the definition of this condition to be more useful:
136 // %%% take these conditions into account in vtable generation
137 if (!_can_be_statically_bound && h_m->is_private())
138 _can_be_statically_bound = true;
139 if (_can_be_statically_bound && h_m->is_abstract())
140 _can_be_statically_bound = false;
141
142 // generating _signature may allow GC and therefore move m.
143 // These fields are always filled in.
144 _name = env->get_symbol(h_m->name());
145 ciSymbol* sig_symbol = env->get_symbol(h_m->signature());
146 constantPoolHandle cpool(Thread::current(), h_m->constants());
147 _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
148 _method_data = nullptr;
149 _method_data_recorded = nullptr;
150 // Take a snapshot of these values, so they will be commensurate with the MDO.
151 if (ProfileInterpreter || CompilerConfig::is_c1_profiling()) {
152 int invcnt = h_m->interpreter_invocation_count();
153 // if the value overflowed report it as max int
154 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
155 _interpreter_throwout_count = h_m->interpreter_throwout_count();
156 } else {
157 _interpreter_invocation_count = 0;
158 _interpreter_throwout_count = 0;
159 }
160 if (_interpreter_invocation_count == 0)
161 _interpreter_invocation_count = 1;
162 _inline_instructions_size = -1;
163 if (ReplayCompiles) {
164 ciReplay::initialize(this);
165 }
166 DirectiveSet* directives = DirectivesStack::getMatchingDirective(h_m, CURRENT_ENV->task()->compiler());
167 ccstrlist bci_list = directives->TooManyTrapsAtBCIOption;
168 int len = (int)strlen(bci_list);
169 Arena* arena = CURRENT_ENV->arena();
170 _has_trap_at_bci = new (arena) GrowableArray<int>(arena, 2, 0, 0);
171 for (int i = 0; i < len; i++) {
172 int v = -1;
173 int read;
174 if (sscanf(bci_list + i, "%i%n", &v, &read) != 1) {
175 warning("wrong format for TooManyTrapsAtBCI option: \"%s\"", bci_list);
176 break;
177 }
178 assert(v >= 0 && v < (1<<16), "%i", v);
179 _has_trap_at_bci->append_if_missing(v);
180 i += read;
181 }
182 }
183
184
185 // ------------------------------------------------------------------
186 // ciMethod::ciMethod
187 //
188 // Unloaded method.
189 ciMethod::ciMethod(ciInstanceKlass* holder,
190 ciSymbol* name,
191 ciSymbol* signature,
192 ciInstanceKlass* accessor) :
193 ciMetadata((Metadata*)nullptr),
194 _name( name),
195 _holder( holder),
196 _method_data( nullptr),
197 _method_data_recorded( nullptr),
198 _method_blocks( nullptr),
199 _intrinsic_id( vmIntrinsics::_none),
200 _inline_instructions_size(-1),
201 _can_be_statically_bound(false),
202 _can_omit_stack_trace(true),
203 _has_trap_at_bci( nullptr),
204 _liveness( nullptr)
205 #if defined(COMPILER2)
206 ,
207 _flow( nullptr),
208 _bcea( nullptr)
209 #endif // COMPILER2
210 {
211 // Usually holder and accessor are the same type but in some cases
212 // the holder has the wrong class loader (e.g. invokedynamic call
213 // sites) so we pass the accessor.
214 _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
215 }
216
217
218 // ------------------------------------------------------------------
219 // ciMethod::load_code
220 //
221 // Load the bytecodes and exception handler table for this method.
222 void ciMethod::load_code() {
223 VM_ENTRY_MARK;
224 assert(is_loaded(), "only loaded methods have code");
225
226 Method* me = get_Method();
227 Arena* arena = CURRENT_THREAD_ENV->arena();
228
229 // Load the bytecodes.
230 _code = (address)arena->Amalloc(code_size());
231 memcpy(_code, me->code_base(), code_size());
232
233 #if INCLUDE_JVMTI
234 // Revert any breakpoint bytecodes in ci's copy
235 if (me->number_of_breakpoints() > 0) {
236 BreakpointInfo* bp = me->method_holder()->breakpoints();
237 for (; bp != nullptr; bp = bp->next()) {
238 if (bp->match(me)) {
239 code_at_put(bp->bci(), bp->orig_bytecode());
240 }
241 }
242 }
243 #endif
244
245 // And load the exception table.
246 ExceptionTable exc_table(me);
247
248 // Allocate one extra spot in our list of exceptions. This
249 // last entry will be used to represent the possibility that
250 // an exception escapes the method. See ciExceptionHandlerStream
251 // for details.
252 _exception_handlers =
253 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
254 * (_handler_count + 1));
255 if (_handler_count > 0) {
256 for (int i=0; i<_handler_count; i++) {
257 _exception_handlers[i] = new (arena) ciExceptionHandler(
258 holder(),
259 /* start */ exc_table.start_pc(i),
260 /* limit */ exc_table.end_pc(i),
261 /* goto pc */ exc_table.handler_pc(i),
262 /* cp index */ exc_table.catch_type_index(i));
263 }
264 }
265
266 // Put an entry at the end of our list to represent the possibility
267 // of exceptional exit.
268 _exception_handlers[_handler_count] =
269 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
270
271 if (CIPrintMethodCodes) {
272 print_codes();
273 }
274 }
275
276
277 // ------------------------------------------------------------------
278 // ciMethod::has_linenumber_table
279 //
280 // length unknown until decompression
281 bool ciMethod::has_linenumber_table() const {
282 check_is_loaded();
283 VM_ENTRY_MARK;
284 return get_Method()->has_linenumber_table();
285 }
286
287
288 // ------------------------------------------------------------------
289 // ciMethod::line_number_from_bci
290 int ciMethod::line_number_from_bci(int bci) const {
291 check_is_loaded();
292 VM_ENTRY_MARK;
293 return get_Method()->line_number_from_bci(bci);
294 }
295
296
297 // ------------------------------------------------------------------
298 // ciMethod::vtable_index
299 //
300 // Get the position of this method's entry in the vtable, if any.
301 int ciMethod::vtable_index() {
302 check_is_loaded();
303 assert(holder()->is_linked(), "must be linked");
304 VM_ENTRY_MARK;
305 return get_Method()->vtable_index();
306 }
307
308 // ------------------------------------------------------------------
309 // ciMethod::uses_balanced_monitors
310 //
311 // Does this method use monitors in a strict stack-disciplined manner?
312 bool ciMethod::has_balanced_monitors() {
313 check_is_loaded();
314 if (_balanced_monitors) return true;
315
316 // Analyze the method to see if monitors are used properly.
317 VM_ENTRY_MARK;
318 methodHandle method(THREAD, get_Method());
319 assert(method->has_monitor_bytecodes(), "should have checked this");
320
321 // Check to see if a previous compilation computed the
322 // monitor-matching analysis.
323 if (method->guaranteed_monitor_matching()) {
324 _balanced_monitors = true;
325 return true;
326 }
327
328 {
329 ExceptionMark em(THREAD);
330 ResourceMark rm(THREAD);
331 GeneratePairingInfo gpi(method);
332 if (!gpi.compute_map(THREAD)) {
333 fatal("Unrecoverable verification or out-of-memory error");
334 }
335 if (!gpi.monitor_safe()) {
336 return false;
337 }
338 method->set_guaranteed_monitor_matching();
339 _balanced_monitors = true;
340 }
341 return true;
342 }
343
344
345 // ------------------------------------------------------------------
346 // ciMethod::get_flow_analysis
347 ciTypeFlow* ciMethod::get_flow_analysis() {
348 #if defined(COMPILER2)
349 if (_flow == nullptr) {
350 ciEnv* env = CURRENT_ENV;
351 _flow = new (env->arena()) ciTypeFlow(env, this);
352 _flow->do_flow();
353 }
354 return _flow;
355 #else // COMPILER2
356 ShouldNotReachHere();
357 return nullptr;
358 #endif // COMPILER2
359 }
360
361
362 // ------------------------------------------------------------------
363 // ciMethod::get_osr_flow_analysis
364 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
365 #if defined(COMPILER2)
366 // OSR entry points are always place after a call bytecode of some sort
367 assert(osr_bci >= 0, "must supply valid OSR entry point");
368 ciEnv* env = CURRENT_ENV;
369 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
370 flow->do_flow();
371 return flow;
372 #else // COMPILER2
373 ShouldNotReachHere();
374 return nullptr;
375 #endif // COMPILER2
376 }
377
378 // ------------------------------------------------------------------
379 // ciMethod::raw_liveness_at_bci
380 //
381 // Which local variables are live at a specific bci?
382 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
383 check_is_loaded();
384 if (_liveness == nullptr) {
385 // Create the liveness analyzer.
386 Arena* arena = CURRENT_ENV->arena();
387 _liveness = new (arena) MethodLiveness(arena, this);
388 _liveness->compute_liveness();
389 }
390 return _liveness->get_liveness_at(bci);
391 }
392
393 // ------------------------------------------------------------------
394 // ciMethod::liveness_at_bci
395 //
396 // Which local variables are live at a specific bci? When debugging
397 // will return true for all locals in some cases to improve debug
398 // information.
399 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
400 if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot) {
401 // Keep all locals live for the user's edification and amusement.
402 MethodLivenessResult result(_max_locals);
403 result.set_range(0, _max_locals);
404 result.set_is_valid();
405 return result;
406 }
407 return raw_liveness_at_bci(bci);
408 }
409
410 // ciMethod::live_local_oops_at_bci
411 //
412 // find all the live oops in the locals array for a particular bci
413 // Compute what the interpreter believes by using the interpreter
414 // oopmap generator. This is used as a double check during osr to
415 // guard against conservative result from MethodLiveness making us
416 // think a dead oop is live. MethodLiveness is conservative in the
417 // sense that it may consider locals to be live which cannot be live,
418 // like in the case where a local could contain an oop or a primitive
419 // along different paths. In that case the local must be dead when
420 // those paths merge. Since the interpreter's viewpoint is used when
421 // gc'ing an interpreter frame we need to use its viewpoint during
422 // OSR when loading the locals.
423
424 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
425 VM_ENTRY_MARK;
426 InterpreterOopMap mask;
427 OopMapCache::compute_one_oop_map(methodHandle(THREAD, get_Method()), bci, &mask);
428 int mask_size = max_locals();
429 ResourceBitMap result(mask_size);
430 int i;
431 for (i = 0; i < mask_size ; i++ ) {
432 if (mask.is_oop(i)) result.set_bit(i);
433 }
434 return result;
435 }
436
437
438 #ifdef COMPILER1
439 // ------------------------------------------------------------------
440 // ciMethod::bci_block_start
441 //
442 // Marks all bcis where a new basic block starts
443 const BitMap& ciMethod::bci_block_start() {
444 check_is_loaded();
445 if (_liveness == nullptr) {
446 // Create the liveness analyzer.
447 Arena* arena = CURRENT_ENV->arena();
448 _liveness = new (arena) MethodLiveness(arena, this);
449 _liveness->compute_liveness();
450 }
451
452 return _liveness->get_bci_block_start();
453 }
454 #endif // COMPILER1
455
456
457 // ------------------------------------------------------------------
458 // ciMethod::check_overflow
459 //
460 // Check whether the profile counter is overflowed and adjust if true.
461 // For invoke* it will turn negative values into max_jint,
462 // and for checkcast/aastore/instanceof turn positive values into min_jint.
463 int ciMethod::check_overflow(int c, Bytecodes::Code code) {
464 switch (code) {
465 case Bytecodes::_aastore: // fall-through
466 case Bytecodes::_checkcast: // fall-through
467 case Bytecodes::_instanceof: {
468 if (VM_Version::profile_all_receivers_at_type_check()) {
469 return (c < 0 ? max_jint : c); // always non-negative
470 }
471 return (c > 0 ? min_jint : c); // always non-positive
472 }
473 default: {
474 assert(Bytecodes::is_invoke(code), "%s", Bytecodes::name(code));
475 return (c < 0 ? max_jint : c); // always non-negative
476 }
477 }
478 }
479
480
481 // ------------------------------------------------------------------
482 // ciMethod::call_profile_at_bci
483 //
484 // Get the ciCallProfile for the invocation of this method.
485 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
486 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
487 ResourceMark rm;
488 ciCallProfile result;
489 if (method_data() != nullptr && method_data()->is_mature()) {
490 ciProfileData* data = method_data()->bci_to_data(bci);
491 if (data != nullptr && data->is_CounterData()) {
492 // Every profiled call site has a counter.
493 int count = check_overflow(data->as_CounterData()->count(), java_code_at_bci(bci));
494
495 if (!data->is_ReceiverTypeData()) {
496 result._receiver_count[0] = 0; // that's a definite zero
497 } else { // ReceiverTypeData is a subclass of CounterData
498 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
499 // In addition, virtual call sites have receiver type information
500 int receivers_count_total = 0;
501 int morphism = 0;
502 // Precompute morphism for the possible fixup
503 for (uint i = 0; i < call->row_limit(); i++) {
504 ciKlass* receiver = call->receiver(i);
505 if (receiver == nullptr) continue;
506 morphism++;
507 }
508 int epsilon = 0;
509 // For a call, it is assumed that either the type of the receiver(s)
510 // is recorded or an associated counter is incremented, but not both. With
511 // tiered compilation, however, both can happen due to the interpreter and
512 // C1 profiling invocations differently. Address that inconsistency here.
513 if (morphism == 1 && count > 0) {
514 epsilon = count;
515 count = 0;
516 }
517 for (uint i = 0; i < call->row_limit(); i++) {
518 ciKlass* receiver = call->receiver(i);
519 if (receiver == nullptr) continue;
520 int rcount = saturated_add(call->receiver_count(i), epsilon);
521 if (rcount == 0) rcount = 1; // Should be valid value
522 receivers_count_total = saturated_add(receivers_count_total, rcount);
523 // Add the receiver to result data.
524 result.add_receiver(receiver, rcount);
525 // If we extend profiling to record methods,
526 // we will set result._method also.
527 }
528 // Determine call site's morphism.
529 // The call site count is 0 with known morphism (only 1 or 2 receivers)
530 // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
531 // The call site count is > 0 in the case of a polymorphic virtual call.
532 if (morphism > 0 && morphism == result._limit) {
533 // The morphism <= MorphismLimit.
534 if ((morphism < ciCallProfile::MorphismLimit) ||
535 (morphism == ciCallProfile::MorphismLimit && count == 0)) {
536 #ifdef ASSERT
537 if (count > 0) {
538 this->print_short_name(tty);
539 tty->print_cr(" @ bci:%d", bci);
540 this->print_codes();
541 assert(false, "this call site should not be polymorphic");
542 }
543 #endif
544 result._morphism = morphism;
545 }
546 }
547 // Make the count consistent if this is a call profile. If count is
548 // zero or less, presume that this is a typecheck profile and
549 // do nothing. Otherwise, increase count to be the sum of all
550 // receiver's counts.
551 if (count >= 0) {
552 count = saturated_add(count, receivers_count_total);
553 }
554 }
555 result._count = count;
556 }
557 }
558 return result;
559 }
560
561 // ------------------------------------------------------------------
562 // Add new receiver and sort data by receiver's profile count.
563 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
564 // Add new receiver and sort data by receiver's counts when we have space
565 // for it otherwise replace the less called receiver (less called receiver
566 // is placed to the last array element which is not used).
567 // First array's element contains most called receiver.
568 int i = _limit;
569 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
570 _receiver[i] = _receiver[i-1];
571 _receiver_count[i] = _receiver_count[i-1];
572 }
573 _receiver[i] = receiver;
574 _receiver_count[i] = receiver_count;
575 if (_limit < MorphismLimit) _limit++;
576 }
577
578
579 void ciMethod::assert_virtual_call_type_ok(int bci) {
580 assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
581 java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
582 }
583
584 void ciMethod::assert_call_type_ok(int bci) {
585 assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
586 java_code_at_bci(bci) == Bytecodes::_invokespecial ||
587 java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
588 }
589
590 /**
591 * Check whether profiling provides a type for the argument i to the
592 * call at bci bci
593 *
594 * @param [in]bci bci of the call
595 * @param [in]i argument number
596 * @param [out]type profiled type of argument, null if none
597 * @param [out]ptr_kind whether always null, never null or maybe null
598 * @return true if profiling exists
599 *
600 */
601 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
602 if (MethodData::profile_parameters() && method_data() != nullptr && method_data()->is_mature()) {
603 ciProfileData* data = method_data()->bci_to_data(bci);
604 if (data != nullptr) {
605 if (data->is_VirtualCallTypeData()) {
606 assert_virtual_call_type_ok(bci);
607 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
608 if (i >= call->number_of_arguments()) {
609 return false;
610 }
611 type = call->valid_argument_type(i);
612 ptr_kind = call->argument_ptr_kind(i);
613 return true;
614 } else if (data->is_CallTypeData()) {
615 assert_call_type_ok(bci);
616 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
617 if (i >= call->number_of_arguments()) {
618 return false;
619 }
620 type = call->valid_argument_type(i);
621 ptr_kind = call->argument_ptr_kind(i);
622 return true;
623 }
624 }
625 }
626 return false;
627 }
628
629 /**
630 * Check whether profiling provides a type for the return value from
631 * the call at bci bci
632 *
633 * @param [in]bci bci of the call
634 * @param [out]type profiled type of argument, null if none
635 * @param [out]ptr_kind whether always null, never null or maybe null
636 * @return true if profiling exists
637 *
638 */
639 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
640 if (MethodData::profile_return() && method_data() != nullptr && method_data()->is_mature()) {
641 ciProfileData* data = method_data()->bci_to_data(bci);
642 if (data != nullptr) {
643 if (data->is_VirtualCallTypeData()) {
644 assert_virtual_call_type_ok(bci);
645 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
646 if (call->has_return()) {
647 type = call->valid_return_type();
648 ptr_kind = call->return_ptr_kind();
649 return true;
650 }
651 } else if (data->is_CallTypeData()) {
652 assert_call_type_ok(bci);
653 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
654 if (call->has_return()) {
655 type = call->valid_return_type();
656 ptr_kind = call->return_ptr_kind();
657 }
658 return true;
659 }
660 }
661 }
662 return false;
663 }
664
665 /**
666 * Check whether profiling provides a type for the parameter i
667 *
668 * @param [in]i parameter number
669 * @param [out]type profiled type of parameter, null if none
670 * @param [out]ptr_kind whether always null, never null or maybe null
671 * @return true if profiling exists
672 *
673 */
674 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
675 if (MethodData::profile_parameters() && method_data() != nullptr && method_data()->is_mature()) {
676 ciParametersTypeData* parameters = method_data()->parameters_type_data();
677 if (parameters != nullptr && i < parameters->number_of_parameters()) {
678 type = parameters->valid_parameter_type(i);
679 ptr_kind = parameters->parameter_ptr_kind(i);
680 return true;
681 }
682 }
683 return false;
684 }
685
686
687 // ------------------------------------------------------------------
688 // ciMethod::find_monomorphic_target
689 //
690 // Given a certain calling environment, find the monomorphic target
691 // for the call. Return null if the call is not monomorphic in
692 // its calling environment, or if there are only abstract methods.
693 // The returned method is never abstract.
694 // Note: If caller uses a non-null result, it must inform dependencies
695 // via assert_unique_concrete_method or assert_leaf_type.
696 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
697 ciInstanceKlass* callee_holder,
698 ciInstanceKlass* actual_recv,
699 bool check_access) {
700 check_is_loaded();
701
702 if (actual_recv->is_interface()) {
703 // %%% We cannot trust interface types, yet. See bug 6312651.
704 return nullptr;
705 }
706
707 ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access, true /* allow_abstract */);
708 if (root_m == nullptr) {
709 // Something went wrong looking up the actual receiver method.
710 return nullptr;
711 }
712
713 // Make certain quick checks even if UseCHA is false.
714
715 // Is it private or final?
716 if (root_m->can_be_statically_bound()) {
717 assert(!root_m->is_abstract(), "sanity");
718 return root_m;
719 }
720
721 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
722 // Easy case. There is no other place to put a method, so don't bother
723 // to go through the VM_ENTRY_MARK and all the rest.
724 if (root_m->is_abstract()) {
725 return nullptr;
726 }
727 return root_m;
728 }
729
730 // Array methods (clone, hashCode, etc.) are always statically bound.
731 // If we were to see an array type here, we'd return root_m.
732 // However, this method processes only ciInstanceKlasses. (See 4962591.)
733 // The inline_native_clone intrinsic narrows Object to T[] properly,
734 // so there is no need to do the same job here.
735
736 if (!UseCHA) return nullptr;
737
738 VM_ENTRY_MARK;
739
740 methodHandle target;
741 {
742 MutexLocker locker(Compile_lock);
743 InstanceKlass* context = actual_recv->get_instanceKlass();
744 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context,
745 root_m->get_Method(),
746 callee_holder->get_Klass(),
747 this->get_Method()));
748 assert(target() == nullptr || !target()->is_abstract(), "not allowed");
749 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
750 }
751
752 #ifndef PRODUCT
753 LogTarget(Debug, dependencies) lt;
754 if (lt.is_enabled() && target() != nullptr && target() != root_m->get_Method()) {
755 LogStream ls(<);
756 ls.print("found a non-root unique target method");
757 ls.print_cr(" context = %s", actual_recv->get_Klass()->external_name());
758 ls.print(" method = ");
759 target->print_short_name(&ls);
760 ls.cr();
761 }
762 #endif //PRODUCT
763
764 if (target() == nullptr) {
765 return nullptr;
766 }
767 if (target() == root_m->get_Method()) {
768 return root_m;
769 }
770 if (!root_m->is_public() &&
771 !root_m->is_protected()) {
772 // If we are going to reason about inheritance, it's easiest
773 // if the method in question is public, protected, or private.
774 // If the answer is not root_m, it is conservatively correct
775 // to return null, even if the CHA encountered irrelevant
776 // methods in other packages.
777 // %%% TO DO: Work out logic for package-private methods
778 // with the same name but different vtable indexes.
779 return nullptr;
780 }
781 return CURRENT_THREAD_ENV->get_method(target());
782 }
783
784 // ------------------------------------------------------------------
785 // ciMethod::can_be_statically_bound
786 //
787 // Tries to determine whether a method can be statically bound in some context.
788 bool ciMethod::can_be_statically_bound(ciInstanceKlass* context) const {
789 return (holder() == context) && can_be_statically_bound();
790 }
791
792 // ------------------------------------------------------------------
793 // ciMethod::can_omit_stack_trace
794 //
795 // Tries to determine whether a method can omit stack trace in throw in compiled code.
796 bool ciMethod::can_omit_stack_trace() const {
797 if (!StackTraceInThrowable) {
798 return true; // stack trace is switched off.
799 }
800 if (!OmitStackTraceInFastThrow) {
801 return false; // Have to provide stack trace.
802 }
803 return _can_omit_stack_trace;
804 }
805
806 // ------------------------------------------------------------------
807 // ciMethod::equals
808 //
809 // Returns true if the methods are the same, taking redefined methods
810 // into account.
811 bool ciMethod::equals(const ciMethod* m) const {
812 if (this == m) return true;
813 VM_ENTRY_MARK;
814 Method* m1 = this->get_Method();
815 Method* m2 = m->get_Method();
816 if (m1->is_old()) m1 = m1->get_new_method();
817 if (m2->is_old()) m2 = m2->get_new_method();
818 return m1 == m2;
819 }
820
821
822 // ------------------------------------------------------------------
823 // ciMethod::resolve_invoke
824 //
825 // Given a known receiver klass, find the target for the call.
826 // Return null if the call has no target or the target is abstract.
827 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access, bool allow_abstract) {
828 check_is_loaded();
829 VM_ENTRY_MARK;
830
831 Klass* caller_klass = caller->get_Klass();
832 Klass* recv = exact_receiver->get_Klass();
833 Klass* resolved = holder()->get_Klass();
834 Symbol* h_name = name()->get_symbol();
835 Symbol* h_signature = signature()->get_symbol();
836
837 LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
838 check_access ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
839 check_access ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
840 Method* m = nullptr;
841 // Only do exact lookup if receiver klass has been linked. Otherwise,
842 // the vtable has not been setup, and the LinkResolver will fail.
843 if (recv->is_array_klass()
844 ||
845 (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
846 if (holder()->is_interface()) {
847 m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
848 } else {
849 m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
850 }
851 }
852
853 if (m == nullptr) {
854 // Return null only if there was a problem with lookup (uninitialized class, etc.)
855 return nullptr;
856 }
857
858 ciMethod* result = this;
859 if (m != get_Method()) {
860 result = CURRENT_THREAD_ENV->get_method(m);
861 }
862
863 if (result->is_abstract() && !allow_abstract) {
864 // Don't return abstract methods because they aren't optimizable or interesting.
865 return nullptr;
866 }
867 return result;
868 }
869
870 // ------------------------------------------------------------------
871 // ciMethod::resolve_vtable_index
872 //
873 // Given a known receiver klass, find the vtable index for the call.
874 // Return Method::invalid_vtable_index if the vtable_index is unknown.
875 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
876 check_is_loaded();
877
878 int vtable_index = Method::invalid_vtable_index;
879 // Only do lookup if receiver klass has been linked. Otherwise,
880 // the vtable has not been setup, and the LinkResolver will fail.
881 if (!receiver->is_interface()
882 && (!receiver->is_instance_klass() ||
883 receiver->as_instance_klass()->is_linked())) {
884 VM_ENTRY_MARK;
885
886 Klass* caller_klass = caller->get_Klass();
887 Klass* recv = receiver->get_Klass();
888 Symbol* h_name = name()->get_symbol();
889 Symbol* h_signature = signature()->get_symbol();
890
891 LinkInfo link_info(recv, h_name, h_signature, caller_klass);
892 vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
893 if (vtable_index == Method::nonvirtual_vtable_index) {
894 // A statically bound method. Return "no such index".
895 vtable_index = Method::invalid_vtable_index;
896 }
897 }
898
899 return vtable_index;
900 }
901
902 // ------------------------------------------------------------------
903 // ciMethod::get_field_at_bci
904 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
905 ciBytecodeStream iter(this);
906 iter.reset_to_bci(bci);
907 iter.next();
908 return iter.get_field(will_link);
909 }
910
911 // ------------------------------------------------------------------
912 // ciMethod::get_method_at_bci
913 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
914 ciBytecodeStream iter(this);
915 iter.reset_to_bci(bci);
916 iter.next();
917 return iter.get_method(will_link, declared_signature);
918 }
919
920 // ------------------------------------------------------------------
921 ciKlass* ciMethod::get_declared_method_holder_at_bci(int bci) {
922 ciBytecodeStream iter(this);
923 iter.reset_to_bci(bci);
924 iter.next();
925 return iter.get_declared_method_holder();
926 }
927
928 // ------------------------------------------------------------------
929 // Adjust a CounterData count to be commensurate with
930 // interpreter_invocation_count. If the MDO exists for
931 // only 25% of the time the method exists, then the
932 // counts in the MDO should be scaled by 4X, so that
933 // they can be usefully and stably compared against the
934 // invocation counts in methods.
935 int ciMethod::scale_count(int count, float prof_factor) {
936 if (count > 0 && method_data() != nullptr) {
937 int counter_life = method_data()->invocation_count();
938 int method_life = interpreter_invocation_count();
939 if (method_life < counter_life) { // may happen because of the snapshot timing
940 method_life = counter_life;
941 }
942 if (counter_life > 0) {
943 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
944 count = (count > 0) ? count : 1;
945 } else {
946 count = 1;
947 }
948 }
949 return count;
950 }
951
952
953 // ------------------------------------------------------------------
954 // ciMethod::is_special_get_caller_class_method
955 //
956 bool ciMethod::is_ignored_by_security_stack_walk() const {
957 check_is_loaded();
958 VM_ENTRY_MARK;
959 return get_Method()->is_ignored_by_security_stack_walk();
960 }
961
962 // ------------------------------------------------------------------
963 // ciMethod::needs_clinit_barrier
964 //
965 bool ciMethod::needs_clinit_barrier() const {
966 check_is_loaded();
967 return is_static() && !holder()->is_initialized();
968 }
969
970 // ------------------------------------------------------------------
971 // invokedynamic support
972
973 // ------------------------------------------------------------------
974 // ciMethod::is_method_handle_intrinsic
975 //
976 // Return true if the method is an instance of the JVM-generated
977 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
978 bool ciMethod::is_method_handle_intrinsic() const {
979 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
980 return (MethodHandles::is_signature_polymorphic(iid) &&
981 MethodHandles::is_signature_polymorphic_intrinsic(iid));
982 }
983
984 // ------------------------------------------------------------------
985 // ciMethod::is_compiled_lambda_form
986 //
987 // Return true if the method is a generated MethodHandle adapter.
988 // These are built by Java code.
989 bool ciMethod::is_compiled_lambda_form() const {
990 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
991 return iid == vmIntrinsics::_compiledLambdaForm;
992 }
993
994 // ------------------------------------------------------------------
995 // ciMethod::is_object_initializer
996 //
997 bool ciMethod::is_object_initializer() const {
998 return name() == ciSymbols::object_initializer_name();
999 }
1000
1001 // ------------------------------------------------------------------
1002 // ciMethod::is_scoped
1003 //
1004 // Return true for methods annotated with @Scoped
1005 bool ciMethod::is_scoped() const {
1006 return get_Method()->is_scoped();
1007 }
1008
1009 // ------------------------------------------------------------------
1010 // ciMethod::has_member_arg
1011 //
1012 // Return true if the method is a linker intrinsic like _linkToVirtual.
1013 // These are built by the JVM.
1014 bool ciMethod::has_member_arg() const {
1015 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
1016 return (MethodHandles::is_signature_polymorphic(iid) &&
1017 MethodHandles::has_member_arg(iid));
1018 }
1019
1020 // ------------------------------------------------------------------
1021 // ciMethod::ensure_method_data
1022 //
1023 // Generate new MethodData* objects at compile time.
1024 // Return true if allocation was successful or no MDO is required.
1025 bool ciMethod::ensure_method_data(const methodHandle& h_m, bool training_data_only) {
1026 EXCEPTION_CONTEXT;
1027 if (is_native() || is_abstract() || h_m()->is_accessor()) {
1028 return true;
1029 }
1030 if (h_m()->method_data() == nullptr) {
1031 if (training_data_only) {
1032 Method::install_training_method_data(h_m);
1033 } else {
1034 Method::build_profiling_method_data(h_m, THREAD);
1035 if (HAS_PENDING_EXCEPTION) {
1036 CLEAR_PENDING_EXCEPTION;
1037 }
1038 }
1039 }
1040 if (h_m()->method_data() != nullptr) {
1041 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1042 return _method_data->load_data();
1043 } else {
1044 _method_data = CURRENT_ENV->get_empty_methodData();
1045 return false;
1046 }
1047 }
1048
1049 // public, retroactive version
1050 bool ciMethod::ensure_method_data(bool training_data_only) {
1051 bool result = true;
1052 if (_method_data == nullptr || _method_data->is_empty()) {
1053 GUARDED_VM_ENTRY({
1054 methodHandle mh(Thread::current(), get_Method());
1055 result = ensure_method_data(mh, training_data_only);
1056 });
1057 }
1058 return result;
1059 }
1060
1061
1062 // ------------------------------------------------------------------
1063 // ciMethod::method_data
1064 //
1065 ciMethodData* ciMethod::method_data() {
1066 if (CURRENT_ENV->task()->is_precompiled() && CURRENT_ENV->task()->comp_level() == CompLevel_full_optimization) {
1067 if (_method_data_recorded == nullptr) {
1068 VM_ENTRY_MARK;
1069 methodHandle h_m(thread, get_Method());
1070 MethodTrainingData* mtd = TrainingData::lookup_for(h_m());
1071 MethodData* mdo = (mtd != nullptr ? mtd->final_profile() : nullptr);
1072 DirectiveSet* directives = DirectivesStack::getMatchingDirective(h_m, CURRENT_ENV->task()->compiler());
1073 if (mdo == nullptr || directives->IgnoreRecordedProfileOption) {
1074 if (directives->IgnoreRecordedProfileOption) {
1075 ResourceMark rm;
1076 log_debug(precompile)("Ignore recorded profile for %s", h_m->name_and_sig_as_C_string());
1077 } else {
1078 ResourceMark rm;
1079 log_debug(precompile)("No profile for %s", h_m->name_and_sig_as_C_string());
1080 }
1081 _method_data_recorded = CURRENT_ENV->get_empty_methodData();
1082 } else {
1083 #if INCLUDE_CDS
1084 if (mdo->extra_data_lock() == nullptr) {
1085 assert(!HAS_PENDING_EXCEPTION, "");
1086 mdo->restore_unshareable_info(thread);
1087 assert(!HAS_PENDING_EXCEPTION, "");
1088 }
1089 #endif
1090 _method_data_recorded = CURRENT_ENV->get_method_data(mdo);
1091 _method_data_recorded->load_data();
1092 {
1093 ResourceMark rm;
1094 log_debug(precompile)("Recorded profile " PTR_FORMAT " for %s", p2i(mdo), h_m->name_and_sig_as_C_string());
1095 }
1096 }
1097 }
1098 assert(_method_data_recorded != nullptr, "");
1099 return _method_data_recorded;
1100 } else {
1101 if (_method_data != nullptr) {
1102 return _method_data;
1103 }
1104 VM_ENTRY_MARK;
1105 methodHandle h_m(thread, get_Method());
1106 MethodData* mdo = h_m()->method_data();
1107 if (mdo != nullptr) {
1108 _method_data = CURRENT_ENV->get_method_data(mdo);
1109 _method_data->load_data();
1110 } else {
1111 _method_data = CURRENT_ENV->get_empty_methodData();
1112 }
1113 return _method_data;
1114 }
1115 }
1116
1117 // ------------------------------------------------------------------
1118 // ciMethod::method_data_or_null
1119 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1120 // null otherwise.
1121 ciMethodData* ciMethod::method_data_or_null() {
1122 ciMethodData *md = method_data();
1123 if (md->is_empty()) {
1124 return nullptr;
1125 }
1126 return md;
1127 }
1128
1129 // ------------------------------------------------------------------
1130 // ciMethod::ensure_method_counters
1131 //
1132 MethodCounters* ciMethod::ensure_method_counters() {
1133 check_is_loaded();
1134 VM_ENTRY_MARK;
1135 methodHandle mh(THREAD, get_Method());
1136 MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1137 return method_counters;
1138 }
1139
1140 // ------------------------------------------------------------------
1141 // ciMethod::has_option
1142 //
1143 bool ciMethod::has_option(CompileCommandEnum option) {
1144 check_is_loaded();
1145 VM_ENTRY_MARK;
1146 methodHandle mh(THREAD, get_Method());
1147 return CompilerOracle::has_option(mh, option);
1148 }
1149
1150 // ------------------------------------------------------------------
1151 // ciMethod::has_option_value
1152 //
1153 bool ciMethod::has_option_value(CompileCommandEnum option, double& value) {
1154 check_is_loaded();
1155 VM_ENTRY_MARK;
1156 methodHandle mh(THREAD, get_Method());
1157 return CompilerOracle::has_option_value(mh, option, value);
1158 }
1159 // ------------------------------------------------------------------
1160 // ciMethod::can_be_compiled
1161 //
1162 // Have previous compilations of this method succeeded?
1163 bool ciMethod::can_be_compiled() {
1164 check_is_loaded();
1165 ciEnv* env = CURRENT_ENV;
1166 if (is_c1_compile(env->comp_level())) {
1167 return _is_c1_compilable;
1168 }
1169
1170 #if INCLUDE_JVMCI
1171 if (EnableJVMCI && UseJVMCICompiler &&
1172 env->comp_level() == CompLevel_full_optimization && !AOTLinkedClassBulkLoader::class_preloading_finished()) {
1173 return false;
1174 }
1175 #endif
1176 return _is_c2_compilable;
1177 }
1178
1179 // ------------------------------------------------------------------
1180 // ciMethod::has_compiled_code
1181 bool ciMethod::has_compiled_code() {
1182 return inline_instructions_size() > 0;
1183 }
1184
1185 int ciMethod::highest_osr_comp_level() {
1186 check_is_loaded();
1187 VM_ENTRY_MARK;
1188 return get_Method()->highest_osr_comp_level();
1189 }
1190
1191 // ------------------------------------------------------------------
1192 // ciMethod::code_size_for_inlining
1193 //
1194 // Code size for inlining decisions. This method returns a code
1195 // size of 1 for methods which has the ForceInline annotation.
1196 int ciMethod::code_size_for_inlining() {
1197 check_is_loaded();
1198 if (get_Method()->force_inline()) {
1199 return 1;
1200 }
1201 return code_size();
1202 }
1203
1204 // ------------------------------------------------------------------
1205 // ciMethod::inline_instructions_size
1206 //
1207 // This is a rough metric for "fat" methods, compared before inlining
1208 // with InlineSmallCode. The CodeBlob::code_size accessor includes
1209 // junk like exception handler, stubs, and constant table, which are
1210 // not highly relevant to an inlined method. So we use the more
1211 // specific accessor nmethod::insts_size.
1212 // Also some instructions inside the code are excluded from inline
1213 // heuristic (e.g. post call nop instructions; see InlineSkippedInstructionsCounter)
1214 int ciMethod::inline_instructions_size() {
1215 if (_inline_instructions_size == -1) {
1216 if (TrainingData::have_data()) {
1217 GUARDED_VM_ENTRY(
1218 CompLevel level = static_cast<CompLevel>(CURRENT_ENV->comp_level());
1219 methodHandle top_level_mh(Thread::current(), CURRENT_ENV->task()->method());
1220 MethodTrainingData* mtd = MethodTrainingData::find(top_level_mh);
1221 if (mtd != nullptr) {
1222 CompileTrainingData* ctd = mtd->last_toplevel_compile(level);
1223 if (ctd != nullptr) {
1224 methodHandle mh(Thread::current(), get_Method());
1225 MethodTrainingData* this_mtd = MethodTrainingData::find(mh);
1226 if (this_mtd != nullptr) {
1227 auto r = ctd->ci_records().ciMethod__inline_instructions_size.find(this_mtd);
1228 if (r.is_valid()) {
1229 _inline_instructions_size = r.result();
1230 }
1231 }
1232 }
1233 }
1234 );
1235 }
1236 }
1237 if (_inline_instructions_size == -1) {
1238 GUARDED_VM_ENTRY(
1239 nmethod* code = get_Method()->code();
1240 if (code != nullptr && !code->is_scc() && (code->comp_level() == CompLevel_full_optimization)) {
1241 int isize = code->insts_end() - code->verified_entry_point() - code->skipped_instructions_size();
1242 _inline_instructions_size = isize > 0 ? isize : 0;
1243 } else {
1244 _inline_instructions_size = 0;
1245 }
1246 if (TrainingData::need_data()) {
1247 CompileTrainingData* ctd = CURRENT_ENV->task()->training_data();
1248 if (ctd != nullptr) {
1249 methodHandle mh(Thread::current(), get_Method());
1250 MethodTrainingData* this_mtd = MethodTrainingData::make(mh);
1251 ctd->ci_records().ciMethod__inline_instructions_size.append_if_missing(_inline_instructions_size, this_mtd);
1252 }
1253 }
1254 );
1255 }
1256 return _inline_instructions_size;
1257 }
1258
1259 // ------------------------------------------------------------------
1260 // ciMethod::log_nmethod_identity
1261 void ciMethod::log_nmethod_identity(xmlStream* log) {
1262 GUARDED_VM_ENTRY(
1263 nmethod* code = get_Method()->code();
1264 if (code != nullptr) {
1265 code->log_identity(log);
1266 }
1267 )
1268 }
1269
1270 // ------------------------------------------------------------------
1271 // ciMethod::is_not_reached
1272 bool ciMethod::is_not_reached(int bci) {
1273 check_is_loaded();
1274 VM_ENTRY_MARK;
1275 return Interpreter::is_not_reached(
1276 methodHandle(THREAD, get_Method()), bci);
1277 }
1278
1279 // ------------------------------------------------------------------
1280 // ciMethod::was_never_executed
1281 bool ciMethod::was_executed_more_than(int times) {
1282 // Invocation counter is reset when the Method* is compiled.
1283 // If the method has compiled code we therefore assume it has
1284 // be executed more than n times.
1285 if (is_accessor() || is_empty() || has_compiled_code()) {
1286 // interpreter doesn't bump invocation counter of trivial methods
1287 // compiler does not bump invocation counter of compiled methods
1288 return true;
1289 }
1290 if (!method_data()->is_empty()) {
1291 return (method_data()->invocation_count() > times);
1292 }
1293 VM_ENTRY_MARK;
1294 return get_Method()->was_executed_more_than(times);
1295 }
1296
1297 // ------------------------------------------------------------------
1298 // ciMethod::has_unloaded_classes_in_signature
1299 bool ciMethod::has_unloaded_classes_in_signature() {
1300 // ciSignature is resolved against some accessing class and
1301 // signature classes aren't required to be local. As a benefit,
1302 // it makes signature classes visible through loader constraints.
1303 // So, encountering an unloaded class signals it is absent both in
1304 // the callee (local) and caller contexts.
1305 return signature()->has_unloaded_classes();
1306 }
1307
1308 // ------------------------------------------------------------------
1309 // ciMethod::is_klass_loaded
1310 bool ciMethod::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1311 VM_ENTRY_MARK;
1312 return get_Method()->is_klass_loaded(refinfo_index, bc, must_be_resolved);
1313 }
1314
1315 // ------------------------------------------------------------------
1316 // ciMethod::check_call
1317 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1318 // This method is used only in C2 from InlineTree::ok_to_inline,
1319 // and is only used under -Xcomp.
1320 // It appears to fail when applied to an invokeinterface call site.
1321 // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1322 VM_ENTRY_MARK;
1323 {
1324 ExceptionMark em(THREAD);
1325 HandleMark hm(THREAD);
1326 constantPoolHandle pool (THREAD, get_Method()->constants());
1327 Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1328 Method* spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1329 if (HAS_PENDING_EXCEPTION) {
1330 CLEAR_PENDING_EXCEPTION;
1331 return false;
1332 } else {
1333 return (spec_method->is_static() == is_static);
1334 }
1335 }
1336 return false;
1337 }
1338 // ------------------------------------------------------------------
1339 // ciMethod::print_codes
1340 //
1341 // Print the bytecodes for this method.
1342 void ciMethod::print_codes_on(outputStream* st) {
1343 check_is_loaded();
1344 GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1345 }
1346
1347
1348 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1349 check_is_loaded(); \
1350 VM_ENTRY_MARK; \
1351 return get_Method()->flag_accessor(); \
1352 }
1353
1354 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1355 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1356 bool ciMethod::is_getter () const { FETCH_FLAG_FROM_VM(is_getter); }
1357 bool ciMethod::is_setter () const { FETCH_FLAG_FROM_VM(is_setter); }
1358 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1359 bool ciMethod::is_empty () const { FETCH_FLAG_FROM_VM(is_empty_method); }
1360
1361 bool ciMethod::is_boxing_method() const {
1362 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1363 switch (intrinsic_id()) {
1364 case vmIntrinsics::_Boolean_valueOf:
1365 case vmIntrinsics::_Byte_valueOf:
1366 case vmIntrinsics::_Character_valueOf:
1367 case vmIntrinsics::_Short_valueOf:
1368 case vmIntrinsics::_Integer_valueOf:
1369 case vmIntrinsics::_Long_valueOf:
1370 case vmIntrinsics::_Float_valueOf:
1371 case vmIntrinsics::_Double_valueOf:
1372 return true;
1373 default:
1374 return false;
1375 }
1376 }
1377 return false;
1378 }
1379
1380 bool ciMethod::is_unboxing_method() const {
1381 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1382 switch (intrinsic_id()) {
1383 case vmIntrinsics::_booleanValue:
1384 case vmIntrinsics::_byteValue:
1385 case vmIntrinsics::_charValue:
1386 case vmIntrinsics::_shortValue:
1387 case vmIntrinsics::_intValue:
1388 case vmIntrinsics::_longValue:
1389 case vmIntrinsics::_floatValue:
1390 case vmIntrinsics::_doubleValue:
1391 return true;
1392 default:
1393 return false;
1394 }
1395 }
1396 return false;
1397 }
1398
1399 bool ciMethod::is_vector_method() const {
1400 return (holder() == ciEnv::current()->vector_VectorSupport_klass()) &&
1401 (intrinsic_id() != vmIntrinsics::_none);
1402 }
1403
1404 BCEscapeAnalyzer *ciMethod::get_bcea() {
1405 #ifdef COMPILER2
1406 if (_bcea == nullptr) {
1407 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, nullptr);
1408 }
1409 return _bcea;
1410 #else // COMPILER2
1411 ShouldNotReachHere();
1412 return nullptr;
1413 #endif // COMPILER2
1414 }
1415
1416 ciMethodBlocks *ciMethod::get_method_blocks() {
1417 if (_method_blocks == nullptr) {
1418 Arena *arena = CURRENT_ENV->arena();
1419 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1420 }
1421 return _method_blocks;
1422 }
1423
1424 #undef FETCH_FLAG_FROM_VM
1425
1426 void ciMethod::dump_name_as_ascii(outputStream* st, Method* method) {
1427 st->print("%s %s %s",
1428 CURRENT_ENV->replay_name(method->method_holder()),
1429 method->name()->as_quoted_ascii(),
1430 method->signature()->as_quoted_ascii());
1431 }
1432
1433 void ciMethod::dump_name_as_ascii(outputStream* st) {
1434 Method* method = get_Method();
1435 dump_name_as_ascii(st, method);
1436 }
1437
1438 void ciMethod::dump_replay_data(outputStream* st) {
1439 ResourceMark rm;
1440 Method* method = get_Method();
1441 if (MethodHandles::is_signature_polymorphic_method(method)) {
1442 // ignore for now
1443 return;
1444 }
1445 MethodCounters* mcs = method->method_counters();
1446 st->print("ciMethod ");
1447 dump_name_as_ascii(st);
1448 st->print_cr(" %d %d %d %d %d",
1449 mcs == nullptr ? 0 : mcs->invocation_counter()->raw_counter(),
1450 mcs == nullptr ? 0 : mcs->backedge_counter()->raw_counter(),
1451 interpreter_invocation_count(),
1452 interpreter_throwout_count(),
1453 _inline_instructions_size);
1454 }
1455
1456 // ------------------------------------------------------------------
1457 // ciMethod::print_codes
1458 //
1459 // Print a range of the bytecodes for this method.
1460 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1461 check_is_loaded();
1462 GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1463 }
1464
1465 // ------------------------------------------------------------------
1466 // ciMethod::print_name
1467 //
1468 // Print the name of this method, including signature and some flags.
1469 void ciMethod::print_name(outputStream* st) {
1470 check_is_loaded();
1471 GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1472 }
1473
1474 // ------------------------------------------------------------------
1475 // ciMethod::print_short_name
1476 //
1477 // Print the name of this method, without signature.
1478 void ciMethod::print_short_name(outputStream* st) {
1479 if (is_loaded()) {
1480 GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1481 } else {
1482 // Fall back if method is not loaded.
1483 holder()->print_name_on(st);
1484 st->print("::");
1485 name()->print_symbol_on(st);
1486 if (WizardMode)
1487 signature()->as_symbol()->print_symbol_on(st);
1488 }
1489 }
1490
1491 // ------------------------------------------------------------------
1492 // ciMethod::print_impl
1493 //
1494 // Implementation of the print method.
1495 void ciMethod::print_impl(outputStream* st) {
1496 ciMetadata::print_impl(st);
1497 st->print(" name=");
1498 name()->print_symbol_on(st);
1499 st->print(" holder=");
1500 holder()->print_name_on(st);
1501 st->print(" signature=");
1502 signature()->as_symbol()->print_symbol_on(st);
1503 if (is_loaded()) {
1504 st->print(" loaded=true");
1505 st->print(" arg_size=%d", arg_size());
1506 st->print(" flags=");
1507 flags().print_member_flags(st);
1508 } else {
1509 st->print(" loaded=false");
1510 }
1511 }
1512
1513 // ------------------------------------------------------------------
1514
1515 static BasicType erase_to_word_type(BasicType bt) {
1516 if (is_subword_type(bt)) return T_INT;
1517 if (is_reference_type(bt)) return T_OBJECT;
1518 return bt;
1519 }
1520
1521 static bool basic_types_match(ciType* t1, ciType* t2) {
1522 if (t1 == t2) return true;
1523 return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1524 }
1525
1526 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1527 bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1528 !resolved_method->is_method_handle_intrinsic();
1529
1530 if (!invoke_through_mh_intrinsic) {
1531 // Method name & descriptor should stay the same.
1532 // Signatures may reference unloaded types and thus they may be not strictly equal.
1533 ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1534 ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1535
1536 return (declared_method->name()->equals(resolved_method->name())) &&
1537 (declared_signature->equals(resolved_signature));
1538 }
1539
1540 ciMethod* linker = declared_method;
1541 ciMethod* target = resolved_method;
1542 // Linkers have appendix argument which is not passed to callee.
1543 int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1544 if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1545 return false; // argument slot count mismatch
1546 }
1547
1548 ciSignature* linker_sig = linker->signature();
1549 ciSignature* target_sig = target->signature();
1550
1551 if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1552 target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1553 return false; // argument count mismatch
1554 }
1555
1556 int sbase = 0, rbase = 0;
1557 switch (linker->intrinsic_id()) {
1558 case vmIntrinsics::_linkToVirtual:
1559 case vmIntrinsics::_linkToInterface:
1560 case vmIntrinsics::_linkToSpecial: {
1561 if (target->is_static()) {
1562 return false;
1563 }
1564 if (linker_sig->type_at(0)->is_primitive_type()) {
1565 return false; // receiver should be an oop
1566 }
1567 sbase = 1; // skip receiver
1568 break;
1569 }
1570 case vmIntrinsics::_linkToStatic: {
1571 if (!target->is_static()) {
1572 return false;
1573 }
1574 break;
1575 }
1576 case vmIntrinsics::_invokeBasic: {
1577 if (target->is_static()) {
1578 if (target_sig->type_at(0)->is_primitive_type()) {
1579 return false; // receiver should be an oop
1580 }
1581 rbase = 1; // skip receiver
1582 }
1583 break;
1584 }
1585 default:
1586 break;
1587 }
1588 assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1589 int arg_count = target_sig->count() - rbase;
1590 for (int i = 0; i < arg_count; i++) {
1591 if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1592 return false;
1593 }
1594 }
1595 // Only check the return type if the symbolic info has non-void return type.
1596 // I.e. the return value of the resolved method can be dropped.
1597 if (!linker->return_type()->is_void() &&
1598 !basic_types_match(linker->return_type(), target->return_type())) {
1599 return false;
1600 }
1601 return true; // no mismatch found
1602 }
1603
1604 // ------------------------------------------------------------------