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