1 /*
2 * Copyright (c) 1999, 2021, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/ciCallProfile.hpp"
27 #include "ci/ciExceptionHandler.hpp"
28 #include "ci/ciInstanceKlass.hpp"
29 #include "ci/ciMethod.hpp"
30 #include "ci/ciMethodBlocks.hpp"
31 #include "ci/ciMethodData.hpp"
32 #include "ci/ciStreams.hpp"
33 #include "ci/ciSymbol.hpp"
34 #include "ci/ciReplay.hpp"
35 #include "ci/ciSymbols.hpp"
36 #include "ci/ciUtilities.inline.hpp"
37 #include "compiler/abstractCompiler.hpp"
38 #include "compiler/methodLiveness.hpp"
39 #include "interpreter/interpreter.hpp"
40 #include "interpreter/linkResolver.hpp"
41 #include "interpreter/oopMapCache.hpp"
42 #include "memory/allocation.inline.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "oops/generateOopMap.hpp"
45 #include "oops/method.inline.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "prims/methodHandles.hpp"
48 #include "runtime/deoptimization.hpp"
49 #include "runtime/handles.inline.hpp"
50 #include "runtime/sharedRuntime.hpp"
51 #include "utilities/bitMap.inline.hpp"
52 #include "utilities/xmlstream.hpp"
53 #ifdef COMPILER2
54 #include "ci/bcEscapeAnalyzer.hpp"
55 #include "ci/ciTypeFlow.hpp"
56 #include "oops/method.hpp"
57 #endif
58
59 // ciMethod
60 //
61 // This class represents a Method* in the HotSpot virtual
62 // machine.
63
64
65 // ------------------------------------------------------------------
66 // ciMethod::ciMethod
67 //
68 // Loaded method.
69 ciMethod::ciMethod(const methodHandle& h_m, ciInstanceKlass* holder) :
70 ciMetadata(h_m()),
71 _holder(holder)
72 {
73 assert(h_m() != NULL, "no null method");
74 assert(_holder->get_instanceKlass() == h_m->method_holder(), "");
75
76 if (LogTouchedMethods) {
77 h_m->log_touched(Thread::current());
78 }
79 // These fields are always filled in in loaded methods.
80 _flags = ciFlags(h_m->access_flags());
81
82 // Easy to compute, so fill them in now.
83 _max_stack = h_m->max_stack();
84 _max_locals = h_m->max_locals();
85 _code_size = h_m->code_size();
86 _intrinsic_id = h_m->intrinsic_id();
87 _handler_count = h_m->exception_table_length();
88 _size_of_parameters = h_m->size_of_parameters();
89 _uses_monitors = h_m->access_flags().has_monitor_bytecodes();
90 _balanced_monitors = !_uses_monitors || h_m->access_flags().is_monitor_matching();
91 _is_c1_compilable = !h_m->is_not_c1_compilable();
92 _is_c2_compilable = !h_m->is_not_c2_compilable();
93 _can_be_parsed = true;
94 _has_reserved_stack_access = h_m->has_reserved_stack_access();
95 _is_overpass = h_m->is_overpass();
96 // Lazy fields, filled in on demand. Require allocation.
97 _code = NULL;
98 _exception_handlers = NULL;
99 _liveness = NULL;
100 _method_blocks = NULL;
101 #if defined(COMPILER2)
102 _flow = NULL;
103 _bcea = NULL;
104 #endif // COMPILER2
105
106 ciEnv *env = CURRENT_ENV;
107 if (env->jvmti_can_hotswap_or_post_breakpoint()) {
108 // 6328518 check hotswap conditions under the right lock.
109 MutexLocker locker(Compile_lock);
110 if (Dependencies::check_evol_method(h_m()) != NULL) {
111 _is_c1_compilable = false;
112 _is_c2_compilable = false;
113 _can_be_parsed = false;
114 }
115 } else {
116 DEBUG_ONLY(CompilerThread::current()->check_possible_safepoint());
117 }
118
119 if (h_m->method_holder()->is_linked()) {
120 _can_be_statically_bound = h_m->can_be_statically_bound();
121 _can_omit_stack_trace = h_m->can_omit_stack_trace();
122 } else {
123 // Have to use a conservative value in this case.
124 _can_be_statically_bound = false;
125 _can_omit_stack_trace = true;
126 }
127
128 // Adjust the definition of this condition to be more useful:
129 // %%% take these conditions into account in vtable generation
130 if (!_can_be_statically_bound && h_m->is_private())
131 _can_be_statically_bound = true;
132 if (_can_be_statically_bound && h_m->is_abstract())
133 _can_be_statically_bound = false;
134
135 // generating _signature may allow GC and therefore move m.
136 // These fields are always filled in.
137 _name = env->get_symbol(h_m->name());
138 ciSymbol* sig_symbol = env->get_symbol(h_m->signature());
139 constantPoolHandle cpool(Thread::current(), h_m->constants());
140 _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
141 _method_data = NULL;
142 _nmethod_age = h_m->nmethod_age();
143 // Take a snapshot of these values, so they will be commensurate with the MDO.
144 if (ProfileInterpreter || CompilerConfig::is_c1_profiling()) {
145 int invcnt = h_m->interpreter_invocation_count();
146 // if the value overflowed report it as max int
147 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
148 _interpreter_throwout_count = h_m->interpreter_throwout_count();
149 } else {
150 _interpreter_invocation_count = 0;
151 _interpreter_throwout_count = 0;
152 }
153 if (_interpreter_invocation_count == 0)
154 _interpreter_invocation_count = 1;
155 _instructions_size = -1;
156 #ifdef ASSERT
157 if (ReplayCompiles) {
158 ciReplay::initialize(this);
159 }
160 #endif
161
162 CompilerOracle::tag_blackhole_if_possible(h_m);
163 }
164
165
166 // ------------------------------------------------------------------
167 // ciMethod::ciMethod
168 //
169 // Unloaded method.
170 ciMethod::ciMethod(ciInstanceKlass* holder,
171 ciSymbol* name,
172 ciSymbol* signature,
173 ciInstanceKlass* accessor) :
174 ciMetadata((Metadata*)NULL),
175 _name( name),
176 _holder( holder),
177 _method_data( NULL),
178 _method_blocks( NULL),
179 _intrinsic_id( vmIntrinsics::_none),
180 _instructions_size(-1),
181 _can_be_statically_bound(false),
182 _can_omit_stack_trace(true),
183 _liveness( NULL)
184 #if defined(COMPILER2)
185 ,
186 _flow( NULL),
187 _bcea( NULL)
188 #endif // COMPILER2
189 {
190 // Usually holder and accessor are the same type but in some cases
191 // the holder has the wrong class loader (e.g. invokedynamic call
192 // sites) so we pass the accessor.
193 _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
194 }
195
196
197 // ------------------------------------------------------------------
198 // ciMethod::load_code
199 //
200 // Load the bytecodes and exception handler table for this method.
201 void ciMethod::load_code() {
202 VM_ENTRY_MARK;
203 assert(is_loaded(), "only loaded methods have code");
204
205 Method* me = get_Method();
206 Arena* arena = CURRENT_THREAD_ENV->arena();
207
208 // Load the bytecodes.
209 _code = (address)arena->Amalloc(code_size());
210 memcpy(_code, me->code_base(), code_size());
211
212 #if INCLUDE_JVMTI
213 // Revert any breakpoint bytecodes in ci's copy
214 if (me->number_of_breakpoints() > 0) {
215 BreakpointInfo* bp = me->method_holder()->breakpoints();
216 for (; bp != NULL; bp = bp->next()) {
217 if (bp->match(me)) {
218 code_at_put(bp->bci(), bp->orig_bytecode());
219 }
220 }
221 }
222 #endif
223
224 // And load the exception table.
225 ExceptionTable exc_table(me);
226
227 // Allocate one extra spot in our list of exceptions. This
228 // last entry will be used to represent the possibility that
229 // an exception escapes the method. See ciExceptionHandlerStream
230 // for details.
231 _exception_handlers =
232 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
233 * (_handler_count + 1));
234 if (_handler_count > 0) {
235 for (int i=0; i<_handler_count; i++) {
236 _exception_handlers[i] = new (arena) ciExceptionHandler(
237 holder(),
238 /* start */ exc_table.start_pc(i),
239 /* limit */ exc_table.end_pc(i),
240 /* goto pc */ exc_table.handler_pc(i),
241 /* cp index */ exc_table.catch_type_index(i));
242 }
243 }
244
245 // Put an entry at the end of our list to represent the possibility
246 // of exceptional exit.
247 _exception_handlers[_handler_count] =
248 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
249
250 if (CIPrintMethodCodes) {
251 print_codes();
252 }
253 }
254
255
256 // ------------------------------------------------------------------
257 // ciMethod::has_linenumber_table
258 //
259 // length unknown until decompression
260 bool ciMethod::has_linenumber_table() const {
261 check_is_loaded();
262 VM_ENTRY_MARK;
263 return get_Method()->has_linenumber_table();
264 }
265
266
267 // ------------------------------------------------------------------
268 // ciMethod::line_number_from_bci
269 int ciMethod::line_number_from_bci(int bci) const {
270 check_is_loaded();
271 VM_ENTRY_MARK;
272 return get_Method()->line_number_from_bci(bci);
273 }
274
275
276 // ------------------------------------------------------------------
277 // ciMethod::vtable_index
278 //
279 // Get the position of this method's entry in the vtable, if any.
280 int ciMethod::vtable_index() {
281 check_is_loaded();
282 assert(holder()->is_linked(), "must be linked");
283 VM_ENTRY_MARK;
284 return get_Method()->vtable_index();
285 }
286
287 // ------------------------------------------------------------------
288 // ciMethod::uses_balanced_monitors
289 //
290 // Does this method use monitors in a strict stack-disciplined manner?
291 bool ciMethod::has_balanced_monitors() {
292 check_is_loaded();
293 if (_balanced_monitors) return true;
294
295 // Analyze the method to see if monitors are used properly.
296 VM_ENTRY_MARK;
297 methodHandle method(THREAD, get_Method());
298 assert(method->has_monitor_bytecodes(), "should have checked this");
299
300 // Check to see if a previous compilation computed the
301 // monitor-matching analysis.
302 if (method->guaranteed_monitor_matching()) {
303 _balanced_monitors = true;
304 return true;
305 }
306
307 {
308 ExceptionMark em(THREAD);
309 ResourceMark rm(THREAD);
310 GeneratePairingInfo gpi(method);
311 if (!gpi.compute_map(THREAD)) {
312 fatal("Unrecoverable verification or out-of-memory error");
313 }
314 if (!gpi.monitor_safe()) {
315 return false;
316 }
317 method->set_guaranteed_monitor_matching();
318 _balanced_monitors = true;
319 }
320 return true;
321 }
322
323
324 // ------------------------------------------------------------------
325 // ciMethod::get_flow_analysis
326 ciTypeFlow* ciMethod::get_flow_analysis() {
327 #if defined(COMPILER2)
328 if (_flow == NULL) {
329 ciEnv* env = CURRENT_ENV;
330 _flow = new (env->arena()) ciTypeFlow(env, this);
331 _flow->do_flow();
332 }
333 return _flow;
334 #else // COMPILER2
335 ShouldNotReachHere();
336 return NULL;
337 #endif // COMPILER2
338 }
339
340
341 // ------------------------------------------------------------------
342 // ciMethod::get_osr_flow_analysis
343 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
344 #if defined(COMPILER2)
345 // OSR entry points are always place after a call bytecode of some sort
346 assert(osr_bci >= 0, "must supply valid OSR entry point");
347 ciEnv* env = CURRENT_ENV;
348 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
349 flow->do_flow();
350 return flow;
351 #else // COMPILER2
352 ShouldNotReachHere();
353 return NULL;
354 #endif // COMPILER2
355 }
356
357 // ------------------------------------------------------------------
358 // ciMethod::raw_liveness_at_bci
359 //
360 // Which local variables are live at a specific bci?
361 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
362 check_is_loaded();
363 if (_liveness == NULL) {
364 // Create the liveness analyzer.
365 Arena* arena = CURRENT_ENV->arena();
366 _liveness = new (arena) MethodLiveness(arena, this);
367 _liveness->compute_liveness();
368 }
369 return _liveness->get_liveness_at(bci);
370 }
371
372 // ------------------------------------------------------------------
373 // ciMethod::liveness_at_bci
374 //
375 // Which local variables are live at a specific bci? When debugging
376 // will return true for all locals in some cases to improve debug
377 // information.
378 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
379 if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot) {
380 // Keep all locals live for the user's edification and amusement.
381 MethodLivenessResult result(_max_locals);
382 result.set_range(0, _max_locals);
383 result.set_is_valid();
384 return result;
385 }
386 return raw_liveness_at_bci(bci);
387 }
388
389 // ciMethod::live_local_oops_at_bci
390 //
391 // find all the live oops in the locals array for a particular bci
392 // Compute what the interpreter believes by using the interpreter
393 // oopmap generator. This is used as a double check during osr to
394 // guard against conservative result from MethodLiveness making us
395 // think a dead oop is live. MethodLiveness is conservative in the
396 // sense that it may consider locals to be live which cannot be live,
397 // like in the case where a local could contain an oop or a primitive
398 // along different paths. In that case the local must be dead when
399 // those paths merge. Since the interpreter's viewpoint is used when
400 // gc'ing an interpreter frame we need to use its viewpoint during
401 // OSR when loading the locals.
402
403 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
404 VM_ENTRY_MARK;
405 InterpreterOopMap mask;
406 OopMapCache::compute_one_oop_map(methodHandle(THREAD, get_Method()), bci, &mask);
407 int mask_size = max_locals();
408 ResourceBitMap result(mask_size);
409 int i;
410 for (i = 0; i < mask_size ; i++ ) {
411 if (mask.is_oop(i)) result.set_bit(i);
412 }
413 return result;
414 }
415
416
417 #ifdef COMPILER1
418 // ------------------------------------------------------------------
419 // ciMethod::bci_block_start
420 //
421 // Marks all bcis where a new basic block starts
422 const BitMap& ciMethod::bci_block_start() {
423 check_is_loaded();
424 if (_liveness == NULL) {
425 // Create the liveness analyzer.
426 Arena* arena = CURRENT_ENV->arena();
427 _liveness = new (arena) MethodLiveness(arena, this);
428 _liveness->compute_liveness();
429 }
430
431 return _liveness->get_bci_block_start();
432 }
433 #endif // COMPILER1
434
435
436 // ------------------------------------------------------------------
437 // ciMethod::check_overflow
438 //
439 // Check whether the profile counter is overflowed and adjust if true.
440 // For invoke* it will turn negative values into max_jint,
441 // and for checkcast/aastore/instanceof turn positive values into min_jint.
442 int ciMethod::check_overflow(int c, Bytecodes::Code code) {
443 switch (code) {
444 case Bytecodes::_aastore: // fall-through
445 case Bytecodes::_checkcast: // fall-through
446 case Bytecodes::_instanceof: {
447 return (c > 0 ? min_jint : c); // always non-positive
448 }
449 default: {
450 assert(Bytecodes::is_invoke(code), "%s", Bytecodes::name(code));
451 return (c < 0 ? max_jint : c); // always non-negative
452 }
453 }
454 }
455
456
457 // ------------------------------------------------------------------
458 // ciMethod::call_profile_at_bci
459 //
460 // Get the ciCallProfile for the invocation of this method.
461 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
462 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
463 ResourceMark rm;
464 ciCallProfile result;
465 if (method_data() != NULL && method_data()->is_mature()) {
466 ciProfileData* data = method_data()->bci_to_data(bci);
467 if (data != NULL && data->is_CounterData()) {
468 // Every profiled call site has a counter.
469 int count = check_overflow(data->as_CounterData()->count(), java_code_at_bci(bci));
470
471 if (!data->is_ReceiverTypeData()) {
472 result._receiver_count[0] = 0; // that's a definite zero
473 } else { // ReceiverTypeData is a subclass of CounterData
474 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
475 // In addition, virtual call sites have receiver type information
476 int receivers_count_total = 0;
477 int morphism = 0;
478 // Precompute morphism for the possible fixup
479 for (uint i = 0; i < call->row_limit(); i++) {
480 ciKlass* receiver = call->receiver(i);
481 if (receiver == NULL) continue;
482 morphism++;
483 }
484 int epsilon = 0;
485 // For a call, it is assumed that either the type of the receiver(s)
486 // is recorded or an associated counter is incremented, but not both. With
487 // tiered compilation, however, both can happen due to the interpreter and
488 // C1 profiling invocations differently. Address that inconsistency here.
489 if (morphism == 1 && count > 0) {
490 epsilon = count;
491 count = 0;
492 }
493 for (uint i = 0; i < call->row_limit(); i++) {
494 ciKlass* receiver = call->receiver(i);
495 if (receiver == NULL) continue;
496 int rcount = saturated_add(call->receiver_count(i), epsilon);
497 if (rcount == 0) rcount = 1; // Should be valid value
498 receivers_count_total = saturated_add(receivers_count_total, rcount);
499 // Add the receiver to result data.
500 result.add_receiver(receiver, rcount);
501 // If we extend profiling to record methods,
502 // we will set result._method also.
503 }
504 // Determine call site's morphism.
505 // The call site count is 0 with known morphism (only 1 or 2 receivers)
506 // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
507 // The call site count is > 0 in the case of a polymorphic virtual call.
508 if (morphism > 0 && morphism == result._limit) {
509 // The morphism <= MorphismLimit.
510 if ((morphism < ciCallProfile::MorphismLimit) ||
511 (morphism == ciCallProfile::MorphismLimit && count == 0)) {
512 #ifdef ASSERT
513 if (count > 0) {
514 this->print_short_name(tty);
515 tty->print_cr(" @ bci:%d", bci);
516 this->print_codes();
517 assert(false, "this call site should not be polymorphic");
518 }
519 #endif
520 result._morphism = morphism;
521 }
522 }
523 // Make the count consistent if this is a call profile. If count is
524 // zero or less, presume that this is a typecheck profile and
525 // do nothing. Otherwise, increase count to be the sum of all
526 // receiver's counts.
527 if (count >= 0) {
528 count = saturated_add(count, receivers_count_total);
529 }
530 }
531 result._count = count;
532 }
533 }
534 return result;
535 }
536
537 // ------------------------------------------------------------------
538 // Add new receiver and sort data by receiver's profile count.
539 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
540 // Add new receiver and sort data by receiver's counts when we have space
541 // for it otherwise replace the less called receiver (less called receiver
542 // is placed to the last array element which is not used).
543 // First array's element contains most called receiver.
544 int i = _limit;
545 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
546 _receiver[i] = _receiver[i-1];
547 _receiver_count[i] = _receiver_count[i-1];
548 }
549 _receiver[i] = receiver;
550 _receiver_count[i] = receiver_count;
551 if (_limit < MorphismLimit) _limit++;
552 }
553
554
555 void ciMethod::assert_virtual_call_type_ok(int bci) {
556 assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
557 java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
558 }
559
560 void ciMethod::assert_call_type_ok(int bci) {
561 assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
562 java_code_at_bci(bci) == Bytecodes::_invokespecial ||
563 java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
564 }
565
566 /**
567 * Check whether profiling provides a type for the argument i to the
568 * call at bci bci
569 *
570 * @param [in]bci bci of the call
571 * @param [in]i argument number
572 * @param [out]type profiled type of argument, NULL if none
573 * @param [out]ptr_kind whether always null, never null or maybe null
574 * @return true if profiling exists
575 *
576 */
577 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
578 if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
579 ciProfileData* data = method_data()->bci_to_data(bci);
580 if (data != NULL) {
581 if (data->is_VirtualCallTypeData()) {
582 assert_virtual_call_type_ok(bci);
583 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
584 if (i >= call->number_of_arguments()) {
585 return false;
586 }
587 type = call->valid_argument_type(i);
588 ptr_kind = call->argument_ptr_kind(i);
589 return true;
590 } else if (data->is_CallTypeData()) {
591 assert_call_type_ok(bci);
592 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
593 if (i >= call->number_of_arguments()) {
594 return false;
595 }
596 type = call->valid_argument_type(i);
597 ptr_kind = call->argument_ptr_kind(i);
598 return true;
599 }
600 }
601 }
602 return false;
603 }
604
605 /**
606 * Check whether profiling provides a type for the return value from
607 * the call at bci bci
608 *
609 * @param [in]bci bci of the call
610 * @param [out]type profiled type of argument, NULL if none
611 * @param [out]ptr_kind whether always null, never null or maybe null
612 * @return true if profiling exists
613 *
614 */
615 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
616 if (MethodData::profile_return() && method_data() != NULL && method_data()->is_mature()) {
617 ciProfileData* data = method_data()->bci_to_data(bci);
618 if (data != NULL) {
619 if (data->is_VirtualCallTypeData()) {
620 assert_virtual_call_type_ok(bci);
621 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
622 if (call->has_return()) {
623 type = call->valid_return_type();
624 ptr_kind = call->return_ptr_kind();
625 return true;
626 }
627 } else if (data->is_CallTypeData()) {
628 assert_call_type_ok(bci);
629 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
630 if (call->has_return()) {
631 type = call->valid_return_type();
632 ptr_kind = call->return_ptr_kind();
633 }
634 return true;
635 }
636 }
637 }
638 return false;
639 }
640
641 /**
642 * Check whether profiling provides a type for the parameter i
643 *
644 * @param [in]i parameter number
645 * @param [out]type profiled type of parameter, NULL if none
646 * @param [out]ptr_kind whether always null, never null or maybe null
647 * @return true if profiling exists
648 *
649 */
650 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
651 if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
652 ciParametersTypeData* parameters = method_data()->parameters_type_data();
653 if (parameters != NULL && i < parameters->number_of_parameters()) {
654 type = parameters->valid_parameter_type(i);
655 ptr_kind = parameters->parameter_ptr_kind(i);
656 return true;
657 }
658 }
659 return false;
660 }
661
662 bool ciMethod::array_access_profiled_type(int bci, ciKlass*& array_type, ciKlass*& element_type, ProfilePtrKind& element_ptr, bool &flat_array, bool &null_free_array) {
663 if (method_data() != NULL && method_data()->is_mature()) {
664 ciProfileData* data = method_data()->bci_to_data(bci);
665 if (data != NULL && data->is_ArrayLoadStoreData()) {
666 ciArrayLoadStoreData* array_access = (ciArrayLoadStoreData*)data->as_ArrayLoadStoreData();
667 array_type = array_access->array()->valid_type();
668 element_type = array_access->element()->valid_type();
669 element_ptr = array_access->element()->ptr_kind();
670 flat_array = array_access->flat_array();
671 null_free_array = array_access->null_free_array();
672 return true;
673 }
674 }
675 return false;
676 }
677
678 bool ciMethod::acmp_profiled_type(int bci, ciKlass*& left_type, ciKlass*& right_type, ProfilePtrKind& left_ptr, ProfilePtrKind& right_ptr, bool &left_inline_type, bool &right_inline_type) {
679 if (method_data() != NULL && method_data()->is_mature()) {
680 ciProfileData* data = method_data()->bci_to_data(bci);
681 if (data != NULL && data->is_ACmpData()) {
682 ciACmpData* acmp = (ciACmpData*)data->as_ACmpData();
683 left_type = acmp->left()->valid_type();
684 right_type = acmp->right()->valid_type();
685 left_ptr = acmp->left()->ptr_kind();
686 right_ptr = acmp->right()->ptr_kind();
687 left_inline_type = acmp->left_inline_type();
688 right_inline_type = acmp->right_inline_type();
689 return true;
690 }
691 }
692 return false;
693 }
694
695
696 // ------------------------------------------------------------------
697 // ciMethod::find_monomorphic_target
698 //
699 // Given a certain calling environment, find the monomorphic target
700 // for the call. Return NULL if the call is not monomorphic in
701 // its calling environment, or if there are only abstract methods.
702 // The returned method is never abstract.
703 // Note: If caller uses a non-null result, it must inform dependencies
704 // via assert_unique_concrete_method or assert_leaf_type.
705 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
706 ciInstanceKlass* callee_holder,
707 ciInstanceKlass* actual_recv,
708 bool check_access) {
709 check_is_loaded();
710
711 if (actual_recv->is_interface()) {
712 // %%% We cannot trust interface types, yet. See bug 6312651.
713 return NULL;
714 }
715
716 ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access, true /* allow_abstract */);
717 if (root_m == NULL) {
718 // Something went wrong looking up the actual receiver method.
719 return NULL;
720 }
721
722 // Make certain quick checks even if UseCHA is false.
723
724 // Is it private or final?
725 if (root_m->can_be_statically_bound()) {
726 assert(!root_m->is_abstract(), "sanity");
727 return root_m;
728 }
729
730 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
731 // Easy case. There is no other place to put a method, so don't bother
732 // to go through the VM_ENTRY_MARK and all the rest.
733 if (root_m->is_abstract()) {
734 return NULL;
735 }
736 return root_m;
737 }
738
739 // Array methods (clone, hashCode, etc.) are always statically bound.
740 // If we were to see an array type here, we'd return root_m.
741 // However, this method processes only ciInstanceKlasses. (See 4962591.)
742 // The inline_native_clone intrinsic narrows Object to T[] properly,
743 // so there is no need to do the same job here.
744
745 if (!UseCHA) return NULL;
746
747 VM_ENTRY_MARK;
748
749 methodHandle target;
750 {
751 MutexLocker locker(Compile_lock);
752 InstanceKlass* context = actual_recv->get_instanceKlass();
753 if (UseVtableBasedCHA) {
754 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context,
755 root_m->get_Method(),
756 callee_holder->get_Klass(),
757 this->get_Method()));
758 } else {
759 if (root_m->is_abstract()) {
760 return NULL; // not supported
761 }
762 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context, root_m->get_Method()));
763 }
764 assert(target() == NULL || !target()->is_abstract(), "not allowed");
765 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
766 }
767
768 #ifndef PRODUCT
769 if (TraceDependencies && target() != NULL && target() != root_m->get_Method()) {
770 tty->print("found a non-root unique target method");
771 tty->print_cr(" context = %s", actual_recv->get_Klass()->external_name());
772 tty->print(" method = ");
773 target->print_short_name(tty);
774 tty->cr();
775 }
776 #endif //PRODUCT
777
778 if (target() == NULL) {
779 return NULL;
780 }
781 if (target() == root_m->get_Method()) {
782 return root_m;
783 }
784 if (!root_m->is_public() &&
785 !root_m->is_protected()) {
786 // If we are going to reason about inheritance, it's easiest
787 // if the method in question is public, protected, or private.
788 // If the answer is not root_m, it is conservatively correct
789 // to return NULL, even if the CHA encountered irrelevant
790 // methods in other packages.
791 // %%% TO DO: Work out logic for package-private methods
792 // with the same name but different vtable indexes.
793 return NULL;
794 }
795 return CURRENT_THREAD_ENV->get_method(target());
796 }
797
798 // ------------------------------------------------------------------
799 // ciMethod::can_be_statically_bound
800 //
801 // Tries to determine whether a method can be statically bound in some context.
802 bool ciMethod::can_be_statically_bound(ciInstanceKlass* context) const {
803 return (holder() == context) && can_be_statically_bound();
804 }
805
806 // ------------------------------------------------------------------
807 // ciMethod::can_omit_stack_trace
808 //
809 // Tries to determine whether a method can omit stack trace in throw in compiled code.
810 bool ciMethod::can_omit_stack_trace() const {
811 if (!StackTraceInThrowable) {
812 return true; // stack trace is switched off.
813 }
814 if (!OmitStackTraceInFastThrow) {
815 return false; // Have to provide stack trace.
816 }
817 return _can_omit_stack_trace;
818 }
819
820 // ------------------------------------------------------------------
821 // ciMethod::resolve_invoke
822 //
823 // Given a known receiver klass, find the target for the call.
824 // Return NULL if the call has no target or the target is abstract.
825 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access, bool allow_abstract) {
826 check_is_loaded();
827 VM_ENTRY_MARK;
828
829 Klass* caller_klass = caller->get_Klass();
830 Klass* recv = exact_receiver->get_Klass();
831 Klass* resolved = holder()->get_Klass();
832 Symbol* h_name = name()->get_symbol();
833 Symbol* h_signature = signature()->get_symbol();
834
835 LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
836 check_access ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
837 check_access ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
838 Method* m = NULL;
839 // Only do exact lookup if receiver klass has been linked. Otherwise,
840 // the vtable has not been setup, and the LinkResolver will fail.
841 if (recv->is_array_klass()
842 ||
843 (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
844 if (holder()->is_interface()) {
845 m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
846 } else {
847 m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
848 }
849 }
850
851 if (m == NULL) {
852 // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
853 return NULL;
854 }
855
856 ciMethod* result = this;
857 if (m != get_Method()) {
858 result = CURRENT_THREAD_ENV->get_method(m);
859 }
860
861 if (result->is_abstract() && !allow_abstract) {
862 // Don't return abstract methods because they aren't optimizable or interesting.
863 return NULL;
864 }
865 return result;
866 }
867
868 // ------------------------------------------------------------------
869 // ciMethod::resolve_vtable_index
870 //
871 // Given a known receiver klass, find the vtable index for the call.
872 // Return Method::invalid_vtable_index if the vtable_index is unknown.
873 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
874 check_is_loaded();
875
876 int vtable_index = Method::invalid_vtable_index;
877 // Only do lookup if receiver klass has been linked. Otherwise,
878 // the vtable has not been setup, and the LinkResolver will fail.
879 if (!receiver->is_interface()
880 && (!receiver->is_instance_klass() ||
881 receiver->as_instance_klass()->is_linked())) {
882 VM_ENTRY_MARK;
883
884 Klass* caller_klass = caller->get_Klass();
885 Klass* recv = receiver->get_Klass();
886 Symbol* h_name = name()->get_symbol();
887 Symbol* h_signature = signature()->get_symbol();
888
889 LinkInfo link_info(recv, h_name, h_signature, caller_klass);
890 vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
891 if (vtable_index == Method::nonvirtual_vtable_index) {
892 // A statically bound method. Return "no such index".
893 vtable_index = Method::invalid_vtable_index;
894 }
895 }
896
897 return vtable_index;
898 }
899
900 // ------------------------------------------------------------------
901 // ciMethod::get_field_at_bci
902 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
903 ciBytecodeStream iter(this);
904 iter.reset_to_bci(bci);
905 iter.next();
906 return iter.get_field(will_link);
907 }
908
909 // ------------------------------------------------------------------
910 // ciMethod::get_method_at_bci
911 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
912 ciBytecodeStream iter(this);
913 iter.reset_to_bci(bci);
914 iter.next();
915 return iter.get_method(will_link, declared_signature);
916 }
917
918 // ------------------------------------------------------------------
919 ciKlass* ciMethod::get_declared_method_holder_at_bci(int bci) {
920 ciBytecodeStream iter(this);
921 iter.reset_to_bci(bci);
922 iter.next();
923 return iter.get_declared_method_holder();
924 }
925
926 // ------------------------------------------------------------------
927 // Adjust a CounterData count to be commensurate with
928 // interpreter_invocation_count. If the MDO exists for
929 // only 25% of the time the method exists, then the
930 // counts in the MDO should be scaled by 4X, so that
931 // they can be usefully and stably compared against the
932 // invocation counts in methods.
933 int ciMethod::scale_count(int count, float prof_factor) {
934 if (count > 0 && method_data() != NULL) {
935 int counter_life = method_data()->invocation_count();
936 int method_life = interpreter_invocation_count();
937 if (method_life < counter_life) { // may happen because of the snapshot timing
938 method_life = counter_life;
939 }
940 if (counter_life > 0) {
941 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
942 count = (count > 0) ? count : 1;
943 } else {
944 count = 1;
945 }
946 }
947 return count;
948 }
949
950
951 // ------------------------------------------------------------------
952 // ciMethod::is_special_get_caller_class_method
953 //
954 bool ciMethod::is_ignored_by_security_stack_walk() const {
955 check_is_loaded();
956 VM_ENTRY_MARK;
957 return get_Method()->is_ignored_by_security_stack_walk();
958 }
959
960 // ------------------------------------------------------------------
961 // ciMethod::needs_clinit_barrier
962 //
963 bool ciMethod::needs_clinit_barrier() const {
964 check_is_loaded();
965 return is_static() && !holder()->is_initialized();
966 }
967
968 // ------------------------------------------------------------------
969 // invokedynamic support
970
971 // ------------------------------------------------------------------
972 // ciMethod::is_method_handle_intrinsic
973 //
974 // Return true if the method is an instance of the JVM-generated
975 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
976 bool ciMethod::is_method_handle_intrinsic() const {
977 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
978 return (MethodHandles::is_signature_polymorphic(iid) &&
979 MethodHandles::is_signature_polymorphic_intrinsic(iid));
980 }
981
982 // ------------------------------------------------------------------
983 // ciMethod::is_compiled_lambda_form
984 //
985 // Return true if the method is a generated MethodHandle adapter.
986 // These are built by Java code.
987 bool ciMethod::is_compiled_lambda_form() const {
988 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
989 return iid == vmIntrinsics::_compiledLambdaForm;
990 }
991
992 // ------------------------------------------------------------------
993 // ciMethod::is_object_constructor
994 //
995 bool ciMethod::is_object_constructor() const {
996 return (name() == ciSymbols::object_initializer_name()
997 && signature()->return_type()->is_void());
998 // Note: We can't test is_static, because that would
999 // require the method to be loaded. Sometimes it isn't.
1000 }
1001
1002 // ------------------------------------------------------------------
1003 // ciMethod::is_static_init_factory
1004 //
1005 bool ciMethod::is_static_init_factory() const {
1006 return (name() == ciSymbols::object_initializer_name()
1007 && !signature()->return_type()->is_void());
1008 // Note: We can't test is_static, because that would
1009 // require the method to be loaded. Sometimes it isn't.
1010 }
1011
1012 // ------------------------------------------------------------------
1013 // ciMethod::has_member_arg
1014 //
1015 // Return true if the method is a linker intrinsic like _linkToVirtual.
1016 // These are built by the JVM.
1017 bool ciMethod::has_member_arg() const {
1018 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
1019 return (MethodHandles::is_signature_polymorphic(iid) &&
1020 MethodHandles::has_member_arg(iid));
1021 }
1022
1023 // ------------------------------------------------------------------
1024 // ciMethod::ensure_method_data
1025 //
1026 // Generate new MethodData* objects at compile time.
1027 // Return true if allocation was successful or no MDO is required.
1028 bool ciMethod::ensure_method_data(const methodHandle& h_m) {
1029 EXCEPTION_CONTEXT;
1030 if (is_native() || is_abstract() || h_m()->is_accessor()) {
1031 return true;
1032 }
1033 if (h_m()->method_data() == NULL) {
1034 Method::build_interpreter_method_data(h_m, THREAD);
1035 if (HAS_PENDING_EXCEPTION) {
1036 CLEAR_PENDING_EXCEPTION;
1037 }
1038 }
1039 if (h_m()->method_data() != NULL) {
1040 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1041 return _method_data->load_data();
1042 } else {
1043 _method_data = CURRENT_ENV->get_empty_methodData();
1044 return false;
1045 }
1046 }
1047
1048 // public, retroactive version
1049 bool ciMethod::ensure_method_data() {
1050 bool result = true;
1051 if (_method_data == NULL || _method_data->is_empty()) {
1052 GUARDED_VM_ENTRY({
1053 methodHandle mh(Thread::current(), get_Method());
1054 result = ensure_method_data(mh);
1055 });
1056 }
1057 return result;
1058 }
1059
1060
1061 // ------------------------------------------------------------------
1062 // ciMethod::method_data
1063 //
1064 ciMethodData* ciMethod::method_data() {
1065 if (_method_data != NULL) {
1066 return _method_data;
1067 }
1068 VM_ENTRY_MARK;
1069 ciEnv* env = CURRENT_ENV;
1070 Thread* my_thread = JavaThread::current();
1071 methodHandle h_m(my_thread, get_Method());
1072
1073 if (h_m()->method_data() != NULL) {
1074 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1075 _method_data->load_data();
1076 } else {
1077 _method_data = CURRENT_ENV->get_empty_methodData();
1078 }
1079 return _method_data;
1080
1081 }
1082
1083 // ------------------------------------------------------------------
1084 // ciMethod::method_data_or_null
1085 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1086 // NULL otherwise.
1087 ciMethodData* ciMethod::method_data_or_null() {
1088 ciMethodData *md = method_data();
1089 if (md->is_empty()) {
1090 return NULL;
1091 }
1092 return md;
1093 }
1094
1095 // ------------------------------------------------------------------
1096 // ciMethod::ensure_method_counters
1097 //
1098 MethodCounters* ciMethod::ensure_method_counters() {
1099 check_is_loaded();
1100 VM_ENTRY_MARK;
1101 methodHandle mh(THREAD, get_Method());
1102 MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1103 return method_counters;
1104 }
1105
1106 // ------------------------------------------------------------------
1107 // ciMethod::has_option
1108 //
1109 bool ciMethod::has_option(enum CompileCommand option) {
1110 check_is_loaded();
1111 VM_ENTRY_MARK;
1112 methodHandle mh(THREAD, get_Method());
1113 return CompilerOracle::has_option(mh, option);
1114 }
1115
1116 // ------------------------------------------------------------------
1117 // ciMethod::has_option_value
1118 //
1119 bool ciMethod::has_option_value(enum CompileCommand option, double& value) {
1120 check_is_loaded();
1121 VM_ENTRY_MARK;
1122 methodHandle mh(THREAD, get_Method());
1123 return CompilerOracle::has_option_value(mh, option, value);
1124 }
1125 // ------------------------------------------------------------------
1126 // ciMethod::can_be_compiled
1127 //
1128 // Have previous compilations of this method succeeded?
1129 bool ciMethod::can_be_compiled() {
1130 check_is_loaded();
1131 ciEnv* env = CURRENT_ENV;
1132 if (is_c1_compile(env->comp_level())) {
1133 return _is_c1_compilable;
1134 }
1135 return _is_c2_compilable;
1136 }
1137
1138 // ------------------------------------------------------------------
1139 // ciMethod::has_compiled_code
1140 bool ciMethod::has_compiled_code() {
1141 return instructions_size() > 0;
1142 }
1143
1144 int ciMethod::highest_osr_comp_level() {
1145 check_is_loaded();
1146 VM_ENTRY_MARK;
1147 return get_Method()->highest_osr_comp_level();
1148 }
1149
1150 // ------------------------------------------------------------------
1151 // ciMethod::code_size_for_inlining
1152 //
1153 // Code size for inlining decisions. This method returns a code
1154 // size of 1 for methods which has the ForceInline annotation.
1155 int ciMethod::code_size_for_inlining() {
1156 check_is_loaded();
1157 if (get_Method()->force_inline()) {
1158 return 1;
1159 }
1160 return code_size();
1161 }
1162
1163 // ------------------------------------------------------------------
1164 // ciMethod::instructions_size
1165 //
1166 // This is a rough metric for "fat" methods, compared before inlining
1167 // with InlineSmallCode. The CodeBlob::code_size accessor includes
1168 // junk like exception handler, stubs, and constant table, which are
1169 // not highly relevant to an inlined method. So we use the more
1170 // specific accessor nmethod::insts_size.
1171 int ciMethod::instructions_size() {
1172 if (_instructions_size == -1) {
1173 GUARDED_VM_ENTRY(
1174 CompiledMethod* code = get_Method()->code();
1175 if (code != NULL && (code->comp_level() == CompLevel_full_optimization)) {
1176 _instructions_size = code->insts_end() - code->verified_entry_point();
1177 } else {
1178 _instructions_size = 0;
1179 }
1180 );
1181 }
1182 return _instructions_size;
1183 }
1184
1185 // ------------------------------------------------------------------
1186 // ciMethod::log_nmethod_identity
1187 void ciMethod::log_nmethod_identity(xmlStream* log) {
1188 GUARDED_VM_ENTRY(
1189 CompiledMethod* code = get_Method()->code();
1190 if (code != NULL) {
1191 code->log_identity(log);
1192 }
1193 )
1194 }
1195
1196 // ------------------------------------------------------------------
1197 // ciMethod::is_not_reached
1198 bool ciMethod::is_not_reached(int bci) {
1199 check_is_loaded();
1200 VM_ENTRY_MARK;
1201 return Interpreter::is_not_reached(
1202 methodHandle(THREAD, get_Method()), bci);
1203 }
1204
1205 // ------------------------------------------------------------------
1206 // ciMethod::was_never_executed
1207 bool ciMethod::was_executed_more_than(int times) {
1208 VM_ENTRY_MARK;
1209 return get_Method()->was_executed_more_than(times);
1210 }
1211
1212 // ------------------------------------------------------------------
1213 // ciMethod::has_unloaded_classes_in_signature
1214 bool ciMethod::has_unloaded_classes_in_signature() {
1215 VM_ENTRY_MARK;
1216 {
1217 ExceptionMark em(THREAD);
1218 methodHandle m(THREAD, get_Method());
1219 bool has_unloaded = Method::has_unloaded_classes_in_signature(m, thread);
1220 if( HAS_PENDING_EXCEPTION ) {
1221 CLEAR_PENDING_EXCEPTION;
1222 return true; // Declare that we may have unloaded classes
1223 }
1224 return has_unloaded;
1225 }
1226 }
1227
1228 // ------------------------------------------------------------------
1229 // ciMethod::is_klass_loaded
1230 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1231 VM_ENTRY_MARK;
1232 return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);
1233 }
1234
1235 // ------------------------------------------------------------------
1236 // ciMethod::check_call
1237 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1238 // This method is used only in C2 from InlineTree::ok_to_inline,
1239 // and is only used under -Xcomp.
1240 // It appears to fail when applied to an invokeinterface call site.
1241 // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1242 VM_ENTRY_MARK;
1243 {
1244 ExceptionMark em(THREAD);
1245 HandleMark hm(THREAD);
1246 constantPoolHandle pool (THREAD, get_Method()->constants());
1247 Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1248 Method* spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1249 if (HAS_PENDING_EXCEPTION) {
1250 CLEAR_PENDING_EXCEPTION;
1251 return false;
1252 } else {
1253 return (spec_method->is_static() == is_static);
1254 }
1255 }
1256 return false;
1257 }
1258
1259 // ------------------------------------------------------------------
1260 // ciMethod::profile_aging
1261 //
1262 // Should the method be compiled with an age counter?
1263 bool ciMethod::profile_aging() const {
1264 return UseCodeAging && (!MethodCounters::is_nmethod_hot(nmethod_age()) &&
1265 !MethodCounters::is_nmethod_age_unset(nmethod_age()));
1266 }
1267 // ------------------------------------------------------------------
1268 // ciMethod::print_codes
1269 //
1270 // Print the bytecodes for this method.
1271 void ciMethod::print_codes_on(outputStream* st) {
1272 check_is_loaded();
1273 GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1274 }
1275
1276
1277 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1278 check_is_loaded(); \
1279 VM_ENTRY_MARK; \
1280 return get_Method()->flag_accessor(); \
1281 }
1282
1283 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1284 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1285 bool ciMethod::is_getter () const { FETCH_FLAG_FROM_VM(is_getter); }
1286 bool ciMethod::is_setter () const { FETCH_FLAG_FROM_VM(is_setter); }
1287 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1288 bool ciMethod::is_object_constructor_or_class_initializer() const { FETCH_FLAG_FROM_VM(is_object_constructor_or_class_initializer); }
1289 bool ciMethod::is_empty () const { FETCH_FLAG_FROM_VM(is_empty_method); }
1290
1291 bool ciMethod::is_boxing_method() const {
1292 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1293 switch (intrinsic_id()) {
1294 case vmIntrinsics::_Boolean_valueOf:
1295 case vmIntrinsics::_Byte_valueOf:
1296 case vmIntrinsics::_Character_valueOf:
1297 case vmIntrinsics::_Short_valueOf:
1298 case vmIntrinsics::_Integer_valueOf:
1299 case vmIntrinsics::_Long_valueOf:
1300 case vmIntrinsics::_Float_valueOf:
1301 case vmIntrinsics::_Double_valueOf:
1302 return true;
1303 default:
1304 return false;
1305 }
1306 }
1307 return false;
1308 }
1309
1310 bool ciMethod::is_unboxing_method() const {
1311 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1312 switch (intrinsic_id()) {
1313 case vmIntrinsics::_booleanValue:
1314 case vmIntrinsics::_byteValue:
1315 case vmIntrinsics::_charValue:
1316 case vmIntrinsics::_shortValue:
1317 case vmIntrinsics::_intValue:
1318 case vmIntrinsics::_longValue:
1319 case vmIntrinsics::_floatValue:
1320 case vmIntrinsics::_doubleValue:
1321 return true;
1322 default:
1323 return false;
1324 }
1325 }
1326 return false;
1327 }
1328
1329 bool ciMethod::is_vector_method() const {
1330 return (holder() == ciEnv::current()->vector_VectorSupport_klass()) &&
1331 (intrinsic_id() != vmIntrinsics::_none);
1332 }
1333
1334 BCEscapeAnalyzer *ciMethod::get_bcea() {
1335 #ifdef COMPILER2
1336 if (_bcea == NULL) {
1337 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1338 }
1339 return _bcea;
1340 #else // COMPILER2
1341 ShouldNotReachHere();
1342 return NULL;
1343 #endif // COMPILER2
1344 }
1345
1346 ciMethodBlocks *ciMethod::get_method_blocks() {
1347 if (_method_blocks == NULL) {
1348 Arena *arena = CURRENT_ENV->arena();
1349 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1350 }
1351 return _method_blocks;
1352 }
1353
1354 #undef FETCH_FLAG_FROM_VM
1355
1356 void ciMethod::dump_name_as_ascii(outputStream* st, Method* method) {
1357 st->print("%s %s %s",
1358 CURRENT_ENV->replay_name(method->method_holder()),
1359 method->name()->as_quoted_ascii(),
1360 method->signature()->as_quoted_ascii());
1361 }
1362
1363 void ciMethod::dump_name_as_ascii(outputStream* st) {
1364 Method* method = get_Method();
1365 dump_name_as_ascii(st, method);
1366 }
1367
1368 void ciMethod::dump_replay_data(outputStream* st) {
1369 ResourceMark rm;
1370 Method* method = get_Method();
1371 if (MethodHandles::is_signature_polymorphic_method(method)) {
1372 // ignore for now
1373 return;
1374 }
1375 MethodCounters* mcs = method->method_counters();
1376 st->print("ciMethod ");
1377 dump_name_as_ascii(st);
1378 st->print_cr(" %d %d %d %d %d",
1379 mcs == NULL ? 0 : mcs->invocation_counter()->raw_counter(),
1380 mcs == NULL ? 0 : mcs->backedge_counter()->raw_counter(),
1381 interpreter_invocation_count(),
1382 interpreter_throwout_count(),
1383 _instructions_size);
1384 }
1385
1386 // ------------------------------------------------------------------
1387 // ciMethod::print_codes
1388 //
1389 // Print a range of the bytecodes for this method.
1390 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1391 check_is_loaded();
1392 GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1393 }
1394
1395 // ------------------------------------------------------------------
1396 // ciMethod::print_name
1397 //
1398 // Print the name of this method, including signature and some flags.
1399 void ciMethod::print_name(outputStream* st) {
1400 check_is_loaded();
1401 GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1402 }
1403
1404 // ------------------------------------------------------------------
1405 // ciMethod::print_short_name
1406 //
1407 // Print the name of this method, without signature.
1408 void ciMethod::print_short_name(outputStream* st) {
1409 if (is_loaded()) {
1410 GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1411 } else {
1412 // Fall back if method is not loaded.
1413 holder()->print_name_on(st);
1414 st->print("::");
1415 name()->print_symbol_on(st);
1416 if (WizardMode)
1417 signature()->as_symbol()->print_symbol_on(st);
1418 }
1419 }
1420
1421 // ------------------------------------------------------------------
1422 // ciMethod::print_impl
1423 //
1424 // Implementation of the print method.
1425 void ciMethod::print_impl(outputStream* st) {
1426 ciMetadata::print_impl(st);
1427 st->print(" name=");
1428 name()->print_symbol_on(st);
1429 st->print(" holder=");
1430 holder()->print_name_on(st);
1431 st->print(" signature=");
1432 signature()->as_symbol()->print_symbol_on(st);
1433 if (is_loaded()) {
1434 st->print(" loaded=true");
1435 st->print(" arg_size=%d", arg_size());
1436 st->print(" flags=");
1437 flags().print_member_flags(st);
1438 } else {
1439 st->print(" loaded=false");
1440 }
1441 }
1442
1443 // ------------------------------------------------------------------
1444
1445 static BasicType erase_to_word_type(BasicType bt) {
1446 if (is_subword_type(bt)) return T_INT;
1447 if (is_reference_type(bt)) return T_OBJECT;
1448 if (bt == T_PRIMITIVE_OBJECT) return T_OBJECT;
1449 return bt;
1450 }
1451
1452 static bool basic_types_match(ciType* t1, ciType* t2) {
1453 if (t1 == t2) return true;
1454 return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1455 }
1456
1457 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1458 bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1459 !resolved_method->is_method_handle_intrinsic();
1460
1461 if (!invoke_through_mh_intrinsic) {
1462 // Method name & descriptor should stay the same.
1463 // Signatures may reference unloaded types and thus they may be not strictly equal.
1464 ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1465 ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1466
1467 return (declared_method->name()->equals(resolved_method->name())) &&
1468 (declared_signature->equals(resolved_signature));
1469 }
1470
1471 ciMethod* linker = declared_method;
1472 ciMethod* target = resolved_method;
1473 // Linkers have appendix argument which is not passed to callee.
1474 int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1475 if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1476 return false; // argument slot count mismatch
1477 }
1478
1479 ciSignature* linker_sig = linker->signature();
1480 ciSignature* target_sig = target->signature();
1481
1482 if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1483 target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1484 return false; // argument count mismatch
1485 }
1486
1487 int sbase = 0, rbase = 0;
1488 switch (linker->intrinsic_id()) {
1489 case vmIntrinsics::_linkToVirtual:
1490 case vmIntrinsics::_linkToInterface:
1491 case vmIntrinsics::_linkToSpecial: {
1492 if (target->is_static()) {
1493 return false;
1494 }
1495 if (linker_sig->type_at(0)->is_primitive_type()) {
1496 return false; // receiver should be an oop
1497 }
1498 sbase = 1; // skip receiver
1499 break;
1500 }
1501 case vmIntrinsics::_linkToStatic: {
1502 if (!target->is_static()) {
1503 return false;
1504 }
1505 break;
1506 }
1507 case vmIntrinsics::_invokeBasic: {
1508 if (target->is_static()) {
1509 if (target_sig->type_at(0)->is_primitive_type()) {
1510 return false; // receiver should be an oop
1511 }
1512 rbase = 1; // skip receiver
1513 }
1514 break;
1515 }
1516 default:
1517 break;
1518 }
1519 assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1520 int arg_count = target_sig->count() - rbase;
1521 for (int i = 0; i < arg_count; i++) {
1522 if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1523 return false;
1524 }
1525 }
1526 // Only check the return type if the symbolic info has non-void return type.
1527 // I.e. the return value of the resolved method can be dropped.
1528 if (!linker->return_type()->is_void() &&
1529 !basic_types_match(linker->return_type(), target->return_type())) {
1530 return false;
1531 }
1532 return true; // no mismatch found
1533 }
1534
1535 // ------------------------------------------------------------------
1536
1537 bool ciMethod::is_scalarized_arg(int idx) const {
1538 VM_ENTRY_MARK;
1539 return get_Method()->is_scalarized_arg(idx);
1540 }
1541
1542 bool ciMethod::has_scalarized_args() const {
1543 VM_ENTRY_MARK;
1544 return get_Method()->has_scalarized_args();
1545 }
1546
1547 const GrowableArray<SigEntry>* ciMethod::get_sig_cc() const {
1548 VM_ENTRY_MARK;
1549 if (get_Method()->adapter() == NULL) {
1550 return NULL;
1551 }
1552 return get_Method()->adapter()->get_sig_cc();
1553 }