1 /*
2 * Copyright (c) 1999, 2017, 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/ciUtilities.hpp"
36 #include "classfile/systemDictionary.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/nativeLookup.hpp"
48 #include "runtime/deoptimization.hpp"
49 #include "utilities/bitMap.inline.hpp"
50 #include "utilities/xmlstream.hpp"
51 #include "trace/tracing.hpp"
52 #ifdef COMPILER2
53 #include "ci/bcEscapeAnalyzer.hpp"
54 #include "ci/ciTypeFlow.hpp"
55 #include "oops/method.hpp"
56 #endif
57
58 // ciMethod
59 //
60 // This class represents a Method* in the HotSpot virtual
61 // machine.
62
63
64 // ------------------------------------------------------------------
65 // ciMethod::ciMethod
66 //
67 // Loaded method.
68 ciMethod::ciMethod(const methodHandle& h_m, ciInstanceKlass* holder) :
69 ciMetadata(h_m()),
70 _holder(holder)
71 {
72 assert(h_m() != NULL, "no null method");
73
74 if (LogTouchedMethods) {
75 h_m()->log_touched(Thread::current());
76 }
77 // These fields are always filled in in loaded methods.
78 _flags = ciFlags(h_m()->access_flags());
79
80 // Easy to compute, so fill them in now.
81 _max_stack = h_m()->max_stack();
82 _max_locals = h_m()->max_locals();
83 _code_size = h_m()->code_size();
84 _intrinsic_id = h_m()->intrinsic_id();
85 _handler_count = h_m()->exception_table_length();
86 _size_of_parameters = h_m()->size_of_parameters();
87 _uses_monitors = h_m()->access_flags().has_monitor_bytecodes();
88 _balanced_monitors = !_uses_monitors || h_m()->access_flags().is_monitor_matching();
89 _is_c1_compilable = !h_m()->is_not_c1_compilable();
90 _is_c2_compilable = !h_m()->is_not_c2_compilable();
91 _can_be_parsed = true;
92 _has_reserved_stack_access = h_m()->has_reserved_stack_access();
93 // Lazy fields, filled in on demand. Require allocation.
94 _code = NULL;
95 _exception_handlers = NULL;
96 _liveness = NULL;
97 _method_blocks = NULL;
98 #if defined(COMPILER2)
99 _flow = NULL;
100 _bcea = NULL;
101 #endif // COMPILER2
102
103 ciEnv *env = CURRENT_ENV;
104 if (env->jvmti_can_hotswap_or_post_breakpoint()) {
105 // 6328518 check hotswap conditions under the right lock.
106 MutexLocker locker(Compile_lock);
107 if (Dependencies::check_evol_method(h_m()) != NULL) {
108 _is_c1_compilable = false;
109 _is_c2_compilable = false;
110 _can_be_parsed = false;
111 }
112 } else {
113 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
114 }
115
116 if (h_m()->method_holder()->is_linked()) {
117 _can_be_statically_bound = h_m()->can_be_statically_bound();
118 } else {
119 // Have to use a conservative value in this case.
120 _can_be_statically_bound = false;
121 }
122
123 // Adjust the definition of this condition to be more useful:
124 // %%% take these conditions into account in vtable generation
125 if (!_can_be_statically_bound && h_m()->is_private())
126 _can_be_statically_bound = true;
127 if (_can_be_statically_bound && h_m()->is_abstract())
128 _can_be_statically_bound = false;
129
130 // generating _signature may allow GC and therefore move m.
131 // These fields are always filled in.
132 _name = env->get_symbol(h_m()->name());
133 ciSymbol* sig_symbol = env->get_symbol(h_m()->signature());
134 constantPoolHandle cpool = h_m()->constants();
135 _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
136 _method_data = NULL;
137 _nmethod_age = h_m()->nmethod_age();
138 // Take a snapshot of these values, so they will be commensurate with the MDO.
139 if (ProfileInterpreter || TieredCompilation) {
140 int invcnt = h_m()->interpreter_invocation_count();
141 // if the value overflowed report it as max int
142 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
143 _interpreter_throwout_count = h_m()->interpreter_throwout_count();
144 } else {
145 _interpreter_invocation_count = 0;
146 _interpreter_throwout_count = 0;
147 }
148 if (_interpreter_invocation_count == 0)
149 _interpreter_invocation_count = 1;
150 _instructions_size = -1;
151 #ifdef ASSERT
152 if (ReplayCompiles) {
153 ciReplay::initialize(this);
154 }
155 #endif
156 }
157
158
159 // ------------------------------------------------------------------
160 // ciMethod::ciMethod
161 //
162 // Unloaded method.
163 ciMethod::ciMethod(ciInstanceKlass* holder,
164 ciSymbol* name,
165 ciSymbol* signature,
166 ciInstanceKlass* accessor) :
167 ciMetadata((Metadata*)NULL),
168 _name( name),
169 _holder( holder),
170 _intrinsic_id( vmIntrinsics::_none),
171 _liveness( NULL),
172 _can_be_statically_bound(false),
173 _method_blocks( NULL),
174 _method_data( NULL)
175 #if defined(COMPILER2)
176 ,
177 _flow( NULL),
178 _bcea( NULL),
179 _instructions_size(-1)
180 #endif // COMPILER2
181 {
182 // Usually holder and accessor are the same type but in some cases
183 // the holder has the wrong class loader (e.g. invokedynamic call
184 // sites) so we pass the accessor.
185 _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
186 }
187
188
189 // ------------------------------------------------------------------
190 // ciMethod::load_code
191 //
192 // Load the bytecodes and exception handler table for this method.
193 void ciMethod::load_code() {
194 VM_ENTRY_MARK;
195 assert(is_loaded(), "only loaded methods have code");
196
197 Method* me = get_Method();
198 Arena* arena = CURRENT_THREAD_ENV->arena();
199
200 // Load the bytecodes.
201 _code = (address)arena->Amalloc(code_size());
202 memcpy(_code, me->code_base(), code_size());
203
204 #if INCLUDE_JVMTI
205 // Revert any breakpoint bytecodes in ci's copy
206 if (me->number_of_breakpoints() > 0) {
207 BreakpointInfo* bp = me->method_holder()->breakpoints();
208 for (; bp != NULL; bp = bp->next()) {
209 if (bp->match(me)) {
210 code_at_put(bp->bci(), bp->orig_bytecode());
211 }
212 }
213 }
214 #endif
215
216 // And load the exception table.
217 ExceptionTable exc_table(me);
218
219 // Allocate one extra spot in our list of exceptions. This
220 // last entry will be used to represent the possibility that
221 // an exception escapes the method. See ciExceptionHandlerStream
222 // for details.
223 _exception_handlers =
224 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
225 * (_handler_count + 1));
226 if (_handler_count > 0) {
227 for (int i=0; i<_handler_count; i++) {
228 _exception_handlers[i] = new (arena) ciExceptionHandler(
229 holder(),
230 /* start */ exc_table.start_pc(i),
231 /* limit */ exc_table.end_pc(i),
232 /* goto pc */ exc_table.handler_pc(i),
233 /* cp index */ exc_table.catch_type_index(i));
234 }
235 }
236
237 // Put an entry at the end of our list to represent the possibility
238 // of exceptional exit.
239 _exception_handlers[_handler_count] =
240 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
241
242 if (CIPrintMethodCodes) {
243 print_codes();
244 }
245 }
246
247
248 // ------------------------------------------------------------------
249 // ciMethod::has_linenumber_table
250 //
251 // length unknown until decompression
252 bool ciMethod::has_linenumber_table() const {
253 check_is_loaded();
254 VM_ENTRY_MARK;
255 return get_Method()->has_linenumber_table();
256 }
257
258
259 // ------------------------------------------------------------------
260 // ciMethod::compressed_linenumber_table
261 u_char* ciMethod::compressed_linenumber_table() const {
262 check_is_loaded();
263 VM_ENTRY_MARK;
264 return get_Method()->compressed_linenumber_table();
265 }
266
267
268 // ------------------------------------------------------------------
269 // ciMethod::line_number_from_bci
270 int ciMethod::line_number_from_bci(int bci) const {
271 check_is_loaded();
272 VM_ENTRY_MARK;
273 return get_Method()->line_number_from_bci(bci);
274 }
275
276
277 // ------------------------------------------------------------------
278 // ciMethod::vtable_index
279 //
280 // Get the position of this method's entry in the vtable, if any.
281 int ciMethod::vtable_index() {
282 check_is_loaded();
283 assert(holder()->is_linked(), "must be linked");
284 VM_ENTRY_MARK;
285 return get_Method()->vtable_index();
286 }
287
288
289 // ------------------------------------------------------------------
290 // ciMethod::native_entry
291 //
292 // Get the address of this method's native code, if any.
293 address ciMethod::native_entry() {
294 check_is_loaded();
295 assert(flags().is_native(), "must be native method");
296 VM_ENTRY_MARK;
297 Method* method = get_Method();
298 address entry = method->native_function();
299 assert(entry != NULL, "must be valid entry point");
300 return entry;
301 }
302
303
304 // ------------------------------------------------------------------
305 // ciMethod::interpreter_entry
306 //
307 // Get the entry point for running this method in the interpreter.
308 address ciMethod::interpreter_entry() {
309 check_is_loaded();
310 VM_ENTRY_MARK;
311 methodHandle mh(THREAD, get_Method());
312 return Interpreter::entry_for_method(mh);
313 }
314
315
316 // ------------------------------------------------------------------
317 // ciMethod::uses_balanced_monitors
318 //
319 // Does this method use monitors in a strict stack-disciplined manner?
320 bool ciMethod::has_balanced_monitors() {
321 check_is_loaded();
322 if (_balanced_monitors) return true;
323
324 // Analyze the method to see if monitors are used properly.
325 VM_ENTRY_MARK;
326 methodHandle method(THREAD, get_Method());
327 assert(method->has_monitor_bytecodes(), "should have checked this");
328
329 // Check to see if a previous compilation computed the
330 // monitor-matching analysis.
331 if (method->guaranteed_monitor_matching()) {
332 _balanced_monitors = true;
333 return true;
334 }
335
336 {
337 EXCEPTION_MARK;
338 ResourceMark rm(THREAD);
339 GeneratePairingInfo gpi(method);
340 gpi.compute_map(CATCH);
341 if (!gpi.monitor_safe()) {
342 return false;
343 }
344 method->set_guaranteed_monitor_matching();
345 _balanced_monitors = true;
346 }
347 return true;
348 }
349
350
351 // ------------------------------------------------------------------
352 // ciMethod::get_flow_analysis
353 ciTypeFlow* ciMethod::get_flow_analysis() {
354 #if defined(COMPILER2)
355 if (_flow == NULL) {
356 ciEnv* env = CURRENT_ENV;
357 _flow = new (env->arena()) ciTypeFlow(env, this);
358 _flow->do_flow();
359 }
360 return _flow;
361 #else // COMPILER2
362 ShouldNotReachHere();
363 return NULL;
364 #endif // COMPILER2
365 }
366
367
368 // ------------------------------------------------------------------
369 // ciMethod::get_osr_flow_analysis
370 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
371 #if defined(COMPILER2)
372 // OSR entry points are always place after a call bytecode of some sort
373 assert(osr_bci >= 0, "must supply valid OSR entry point");
374 ciEnv* env = CURRENT_ENV;
375 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
376 flow->do_flow();
377 return flow;
378 #else // COMPILER2
379 ShouldNotReachHere();
380 return NULL;
381 #endif // COMPILER2
382 }
383
384 // ------------------------------------------------------------------
385 // ciMethod::raw_liveness_at_bci
386 //
387 // Which local variables are live at a specific bci?
388 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
389 check_is_loaded();
390 if (_liveness == NULL) {
391 // Create the liveness analyzer.
392 Arena* arena = CURRENT_ENV->arena();
393 _liveness = new (arena) MethodLiveness(arena, this);
394 _liveness->compute_liveness();
395 }
396 return _liveness->get_liveness_at(bci);
397 }
398
399 // ------------------------------------------------------------------
400 // ciMethod::liveness_at_bci
401 //
402 // Which local variables are live at a specific bci? When debugging
403 // will return true for all locals in some cases to improve debug
404 // information.
405 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
406 MethodLivenessResult result = raw_liveness_at_bci(bci);
407 if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot || CompileTheWorld) {
408 // Keep all locals live for the user's edification and amusement.
409 result.at_put_range(0, result.size(), true);
410 }
411 return result;
412 }
413
414 // ciMethod::live_local_oops_at_bci
415 //
416 // find all the live oops in the locals array for a particular bci
417 // Compute what the interpreter believes by using the interpreter
418 // oopmap generator. This is used as a double check during osr to
419 // guard against conservative result from MethodLiveness making us
420 // think a dead oop is live. MethodLiveness is conservative in the
421 // sense that it may consider locals to be live which cannot be live,
422 // like in the case where a local could contain an oop or a primitive
423 // along different paths. In that case the local must be dead when
424 // those paths merge. Since the interpreter's viewpoint is used when
425 // gc'ing an interpreter frame we need to use its viewpoint during
426 // OSR when loading the locals.
427
428 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
429 VM_ENTRY_MARK;
430 InterpreterOopMap mask;
431 OopMapCache::compute_one_oop_map(get_Method(), bci, &mask);
432 int mask_size = max_locals();
433 ResourceBitMap result(mask_size);
434 int i;
435 for (i = 0; i < mask_size ; i++ ) {
436 if (mask.is_oop(i)) result.set_bit(i);
437 }
438 return result;
439 }
440
441
442 #ifdef COMPILER1
443 // ------------------------------------------------------------------
444 // ciMethod::bci_block_start
445 //
446 // Marks all bcis where a new basic block starts
447 const BitMap& ciMethod::bci_block_start() {
448 check_is_loaded();
449 if (_liveness == NULL) {
450 // Create the liveness analyzer.
451 Arena* arena = CURRENT_ENV->arena();
452 _liveness = new (arena) MethodLiveness(arena, this);
453 _liveness->compute_liveness();
454 }
455
456 return _liveness->get_bci_block_start();
457 }
458 #endif // COMPILER1
459
460
461 // ------------------------------------------------------------------
462 // ciMethod::call_profile_at_bci
463 //
464 // Get the ciCallProfile for the invocation of this method.
465 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
466 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
467 ResourceMark rm;
468 ciCallProfile result;
469 if (method_data() != NULL && method_data()->is_mature()) {
470 ciProfileData* data = method_data()->bci_to_data(bci);
471 if (data != NULL && data->is_CounterData()) {
472 // Every profiled call site has a counter.
473 int count = data->as_CounterData()->count();
474
475 if (!data->is_ReceiverTypeData()) {
476 result._receiver_count[0] = 0; // that's a definite zero
477 } else { // ReceiverTypeData is a subclass of CounterData
478 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
479 // In addition, virtual call sites have receiver type information
480 int receivers_count_total = 0;
481 int morphism = 0;
482 // Precompute morphism for the possible fixup
483 for (uint i = 0; i < call->row_limit(); i++) {
484 ciKlass* receiver = call->receiver(i);
485 if (receiver == NULL) continue;
486 morphism++;
487 }
488 int epsilon = 0;
489 if (TieredCompilation) {
490 // For a call, it is assumed that either the type of the receiver(s)
491 // is recorded or an associated counter is incremented, but not both. With
492 // tiered compilation, however, both can happen due to the interpreter and
493 // C1 profiling invocations differently. Address that inconsistency here.
494 if (morphism == 1 && count > 0) {
495 epsilon = count;
496 count = 0;
497 }
498 }
499 for (uint i = 0; i < call->row_limit(); i++) {
500 ciKlass* receiver = call->receiver(i);
501 if (receiver == NULL) continue;
502 int rcount = call->receiver_count(i) + epsilon;
503 if (rcount == 0) rcount = 1; // Should be valid value
504 receivers_count_total += rcount;
505 // Add the receiver to result data.
506 result.add_receiver(receiver, rcount);
507 // If we extend profiling to record methods,
508 // we will set result._method also.
509 }
510 // Determine call site's morphism.
511 // The call site count is 0 with known morphism (only 1 or 2 receivers)
512 // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
513 // The call site count is > 0 in the case of a polymorphic virtual call.
514 if (morphism > 0 && morphism == result._limit) {
515 // The morphism <= MorphismLimit.
516 if ((morphism < ciCallProfile::MorphismLimit) ||
517 (morphism == ciCallProfile::MorphismLimit && count == 0)) {
518 #ifdef ASSERT
519 if (count > 0) {
520 this->print_short_name(tty);
521 tty->print_cr(" @ bci:%d", bci);
522 this->print_codes();
523 assert(false, "this call site should not be polymorphic");
524 }
525 #endif
526 result._morphism = morphism;
527 }
528 }
529 // Make the count consistent if this is a call profile. If count is
530 // zero or less, presume that this is a typecheck profile and
531 // do nothing. Otherwise, increase count to be the sum of all
532 // receiver's counts.
533 if (count >= 0) {
534 count += receivers_count_total;
535 }
536 }
537 result._count = count;
538 }
539 }
540 return result;
541 }
542
543 // ------------------------------------------------------------------
544 // Add new receiver and sort data by receiver's profile count.
545 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
546 // Add new receiver and sort data by receiver's counts when we have space
547 // for it otherwise replace the less called receiver (less called receiver
548 // is placed to the last array element which is not used).
549 // First array's element contains most called receiver.
550 int i = _limit;
551 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
552 _receiver[i] = _receiver[i-1];
553 _receiver_count[i] = _receiver_count[i-1];
554 }
555 _receiver[i] = receiver;
556 _receiver_count[i] = receiver_count;
557 if (_limit < MorphismLimit) _limit++;
558 }
559
560
561 void ciMethod::assert_virtual_call_type_ok(int bci) {
562 assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
563 java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
564 }
565
566 void ciMethod::assert_call_type_ok(int bci) {
567 assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
568 java_code_at_bci(bci) == Bytecodes::_invokespecial ||
569 java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
570 }
571
572 /**
573 * Check whether profiling provides a type for the argument i to the
574 * call at bci bci
575 *
576 * @param [in]bci bci of the call
577 * @param [in]i argument number
578 * @param [out]type profiled type of argument, NULL if none
579 * @param [out]ptr_kind whether always null, never null or maybe null
580 * @return true if profiling exists
581 *
582 */
583 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
584 if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
585 ciProfileData* data = method_data()->bci_to_data(bci);
586 if (data != NULL) {
587 if (data->is_VirtualCallTypeData()) {
588 assert_virtual_call_type_ok(bci);
589 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
590 if (i >= call->number_of_arguments()) {
591 return false;
592 }
593 type = call->valid_argument_type(i);
594 ptr_kind = call->argument_ptr_kind(i);
595 return true;
596 } else if (data->is_CallTypeData()) {
597 assert_call_type_ok(bci);
598 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
599 if (i >= call->number_of_arguments()) {
600 return false;
601 }
602 type = call->valid_argument_type(i);
603 ptr_kind = call->argument_ptr_kind(i);
604 return true;
605 }
606 }
607 }
608 return false;
609 }
610
611 /**
612 * Check whether profiling provides a type for the return value from
613 * the call at bci bci
614 *
615 * @param [in]bci bci of the call
616 * @param [out]type profiled type of argument, NULL if none
617 * @param [out]ptr_kind whether always null, never null or maybe null
618 * @return true if profiling exists
619 *
620 */
621 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
622 if (MethodData::profile_return() && method_data() != NULL && method_data()->is_mature()) {
623 ciProfileData* data = method_data()->bci_to_data(bci);
624 if (data != NULL) {
625 if (data->is_VirtualCallTypeData()) {
626 assert_virtual_call_type_ok(bci);
627 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
628 if (call->has_return()) {
629 type = call->valid_return_type();
630 ptr_kind = call->return_ptr_kind();
631 return true;
632 }
633 } else if (data->is_CallTypeData()) {
634 assert_call_type_ok(bci);
635 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
636 if (call->has_return()) {
637 type = call->valid_return_type();
638 ptr_kind = call->return_ptr_kind();
639 }
640 return true;
641 }
642 }
643 }
644 return false;
645 }
646
647 /**
648 * Check whether profiling provides a type for the parameter i
649 *
650 * @param [in]i parameter number
651 * @param [out]type profiled type of parameter, NULL if none
652 * @param [out]ptr_kind whether always null, never null or maybe null
653 * @return true if profiling exists
654 *
655 */
656 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
657 if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
658 ciParametersTypeData* parameters = method_data()->parameters_type_data();
659 if (parameters != NULL && i < parameters->number_of_parameters()) {
660 type = parameters->valid_parameter_type(i);
661 ptr_kind = parameters->parameter_ptr_kind(i);
662 return true;
663 }
664 }
665 return false;
666 }
667
668
669 // ------------------------------------------------------------------
670 // ciMethod::find_monomorphic_target
671 //
672 // Given a certain calling environment, find the monomorphic target
673 // for the call. Return NULL if the call is not monomorphic in
674 // its calling environment, or if there are only abstract methods.
675 // The returned method is never abstract.
676 // Note: If caller uses a non-null result, it must inform dependencies
677 // via assert_unique_concrete_method or assert_leaf_type.
678 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
679 ciInstanceKlass* callee_holder,
680 ciInstanceKlass* actual_recv,
681 bool check_access) {
682 check_is_loaded();
683
684 if (actual_recv->is_interface()) {
685 // %%% We cannot trust interface types, yet. See bug 6312651.
686 return NULL;
687 }
688
689 ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access);
690 if (root_m == NULL) {
691 // Something went wrong looking up the actual receiver method.
692 return NULL;
693 }
694 assert(!root_m->is_abstract(), "resolve_invoke promise");
695
696 // Make certain quick checks even if UseCHA is false.
697
698 // Is it private or final?
699 if (root_m->can_be_statically_bound()) {
700 return root_m;
701 }
702
703 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
704 // Easy case. There is no other place to put a method, so don't bother
705 // to go through the VM_ENTRY_MARK and all the rest.
706 return root_m;
707 }
708
709 // Array methods (clone, hashCode, etc.) are always statically bound.
710 // If we were to see an array type here, we'd return root_m.
711 // However, this method processes only ciInstanceKlasses. (See 4962591.)
712 // The inline_native_clone intrinsic narrows Object to T[] properly,
713 // so there is no need to do the same job here.
714
715 if (!UseCHA) return NULL;
716
717 VM_ENTRY_MARK;
718
719 // Disable CHA for default methods for now
720 if (root_m->get_Method()->is_default_method()) {
721 return NULL;
722 }
723
724 methodHandle target;
725 {
726 MutexLocker locker(Compile_lock);
727 Klass* context = actual_recv->get_Klass();
728 target = Dependencies::find_unique_concrete_method(context,
729 root_m->get_Method());
730 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
731 }
732
733 #ifndef PRODUCT
734 if (TraceDependencies && target() != NULL && target() != root_m->get_Method()) {
735 tty->print("found a non-root unique target method");
736 tty->print_cr(" context = %s", actual_recv->get_Klass()->external_name());
737 tty->print(" method = ");
738 target->print_short_name(tty);
739 tty->cr();
740 }
741 #endif //PRODUCT
742
743 if (target() == NULL) {
744 return NULL;
745 }
746 if (target() == root_m->get_Method()) {
747 return root_m;
748 }
749 if (!root_m->is_public() &&
750 !root_m->is_protected()) {
751 // If we are going to reason about inheritance, it's easiest
752 // if the method in question is public, protected, or private.
753 // If the answer is not root_m, it is conservatively correct
754 // to return NULL, even if the CHA encountered irrelevant
755 // methods in other packages.
756 // %%% TO DO: Work out logic for package-private methods
757 // with the same name but different vtable indexes.
758 return NULL;
759 }
760 return CURRENT_THREAD_ENV->get_method(target());
761 }
762
763 // ------------------------------------------------------------------
764 // ciMethod::resolve_invoke
765 //
766 // Given a known receiver klass, find the target for the call.
767 // Return NULL if the call has no target or the target is abstract.
768 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access) {
769 check_is_loaded();
770 VM_ENTRY_MARK;
771
772 Klass* caller_klass = caller->get_Klass();
773 Klass* recv = exact_receiver->get_Klass();
774 Klass* resolved = holder()->get_Klass();
775 Symbol* h_name = name()->get_symbol();
776 Symbol* h_signature = signature()->get_symbol();
777
778 LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
779 check_access ? LinkInfo::needs_access_check : LinkInfo::skip_access_check);
780 methodHandle m;
781 // Only do exact lookup if receiver klass has been linked. Otherwise,
782 // the vtable has not been setup, and the LinkResolver will fail.
783 if (recv->is_array_klass()
784 ||
785 (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
786 if (holder()->is_interface()) {
787 m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
788 } else {
789 m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
790 }
791 }
792
793 if (m.is_null()) {
794 // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
795 return NULL;
796 }
797
798 ciMethod* result = this;
799 if (m() != get_Method()) {
800 result = CURRENT_THREAD_ENV->get_method(m());
801 }
802
803 // Don't return abstract methods because they aren't
804 // optimizable or interesting.
805 if (result->is_abstract()) {
806 return NULL;
807 } else {
808 return result;
809 }
810 }
811
812 // ------------------------------------------------------------------
813 // ciMethod::resolve_vtable_index
814 //
815 // Given a known receiver klass, find the vtable index for the call.
816 // Return Method::invalid_vtable_index if the vtable_index is unknown.
817 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
818 check_is_loaded();
819
820 int vtable_index = Method::invalid_vtable_index;
821 // Only do lookup if receiver klass has been linked. Otherwise,
822 // the vtable has not been setup, and the LinkResolver will fail.
823 if (!receiver->is_interface()
824 && (!receiver->is_instance_klass() ||
825 receiver->as_instance_klass()->is_linked())) {
826 VM_ENTRY_MARK;
827
828 Klass* caller_klass = caller->get_Klass();
829 Klass* recv = receiver->get_Klass();
830 Symbol* h_name = name()->get_symbol();
831 Symbol* h_signature = signature()->get_symbol();
832
833 LinkInfo link_info(recv, h_name, h_signature, caller_klass);
834 vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
835 if (vtable_index == Method::nonvirtual_vtable_index) {
836 // A statically bound method. Return "no such index".
837 vtable_index = Method::invalid_vtable_index;
838 }
839 }
840
841 return vtable_index;
842 }
843
844 // ------------------------------------------------------------------
845 // ciMethod::interpreter_call_site_count
846 int ciMethod::interpreter_call_site_count(int bci) {
847 if (method_data() != NULL) {
848 ResourceMark rm;
849 ciProfileData* data = method_data()->bci_to_data(bci);
850 if (data != NULL && data->is_CounterData()) {
851 return scale_count(data->as_CounterData()->count());
852 }
853 }
854 return -1; // unknown
855 }
856
857 // ------------------------------------------------------------------
858 // ciMethod::get_field_at_bci
859 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
860 ciBytecodeStream iter(this);
861 iter.reset_to_bci(bci);
862 iter.next();
863 return iter.get_field(will_link);
864 }
865
866 // ------------------------------------------------------------------
867 // ciMethod::get_method_at_bci
868 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
869 ciBytecodeStream iter(this);
870 iter.reset_to_bci(bci);
871 iter.next();
872 return iter.get_method(will_link, declared_signature);
873 }
874
875 // ------------------------------------------------------------------
876 // Adjust a CounterData count to be commensurate with
877 // interpreter_invocation_count. If the MDO exists for
878 // only 25% of the time the method exists, then the
879 // counts in the MDO should be scaled by 4X, so that
880 // they can be usefully and stably compared against the
881 // invocation counts in methods.
882 int ciMethod::scale_count(int count, float prof_factor) {
883 if (count > 0 && method_data() != NULL) {
884 int counter_life;
885 int method_life = interpreter_invocation_count();
886 if (TieredCompilation) {
887 // In tiered the MDO's life is measured directly, so just use the snapshotted counters
888 counter_life = MAX2(method_data()->invocation_count(), method_data()->backedge_count());
889 } else {
890 int current_mileage = method_data()->current_mileage();
891 int creation_mileage = method_data()->creation_mileage();
892 counter_life = current_mileage - creation_mileage;
893 }
894
895 // counter_life due to backedge_counter could be > method_life
896 if (counter_life > method_life)
897 counter_life = method_life;
898 if (0 < counter_life && counter_life <= method_life) {
899 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
900 count = (count > 0) ? count : 1;
901 }
902 }
903 return count;
904 }
905
906
907 // ------------------------------------------------------------------
908 // ciMethod::is_special_get_caller_class_method
909 //
910 bool ciMethod::is_ignored_by_security_stack_walk() const {
911 check_is_loaded();
912 VM_ENTRY_MARK;
913 return get_Method()->is_ignored_by_security_stack_walk();
914 }
915
916
917 // ------------------------------------------------------------------
918 // invokedynamic support
919
920 // ------------------------------------------------------------------
921 // ciMethod::is_method_handle_intrinsic
922 //
923 // Return true if the method is an instance of the JVM-generated
924 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
925 bool ciMethod::is_method_handle_intrinsic() const {
926 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
927 return (MethodHandles::is_signature_polymorphic(iid) &&
928 MethodHandles::is_signature_polymorphic_intrinsic(iid));
929 }
930
931 // ------------------------------------------------------------------
932 // ciMethod::is_compiled_lambda_form
933 //
934 // Return true if the method is a generated MethodHandle adapter.
935 // These are built by Java code.
936 bool ciMethod::is_compiled_lambda_form() const {
937 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
938 return iid == vmIntrinsics::_compiledLambdaForm;
939 }
940
941 // ------------------------------------------------------------------
942 // ciMethod::is_object_initializer
943 //
944 bool ciMethod::is_object_initializer() const {
945 return name() == ciSymbol::object_initializer_name();
946 }
947
948 // ------------------------------------------------------------------
949 // ciMethod::has_member_arg
950 //
951 // Return true if the method is a linker intrinsic like _linkToVirtual.
952 // These are built by the JVM.
953 bool ciMethod::has_member_arg() const {
954 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
955 return (MethodHandles::is_signature_polymorphic(iid) &&
956 MethodHandles::has_member_arg(iid));
957 }
958
959 // ------------------------------------------------------------------
960 // ciMethod::ensure_method_data
961 //
962 // Generate new MethodData* objects at compile time.
963 // Return true if allocation was successful or no MDO is required.
964 bool ciMethod::ensure_method_data(const methodHandle& h_m) {
965 EXCEPTION_CONTEXT;
966 if (is_native() || is_abstract() || h_m()->is_accessor()) {
967 return true;
968 }
969 if (h_m()->method_data() == NULL) {
970 Method::build_interpreter_method_data(h_m, THREAD);
971 if (HAS_PENDING_EXCEPTION) {
972 CLEAR_PENDING_EXCEPTION;
973 }
974 }
975 if (h_m()->method_data() != NULL) {
976 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
977 _method_data->load_data();
978 return true;
979 } else {
980 _method_data = CURRENT_ENV->get_empty_methodData();
981 return false;
982 }
983 }
984
985 // public, retroactive version
986 bool ciMethod::ensure_method_data() {
987 bool result = true;
988 if (_method_data == NULL || _method_data->is_empty()) {
989 GUARDED_VM_ENTRY({
990 result = ensure_method_data(get_Method());
991 });
992 }
993 return result;
994 }
995
996
997 // ------------------------------------------------------------------
998 // ciMethod::method_data
999 //
1000 ciMethodData* ciMethod::method_data() {
1001 if (_method_data != NULL) {
1002 return _method_data;
1003 }
1004 VM_ENTRY_MARK;
1005 ciEnv* env = CURRENT_ENV;
1006 Thread* my_thread = JavaThread::current();
1007 methodHandle h_m(my_thread, get_Method());
1008
1009 if (h_m()->method_data() != NULL) {
1010 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1011 _method_data->load_data();
1012 } else {
1013 _method_data = CURRENT_ENV->get_empty_methodData();
1014 }
1015 return _method_data;
1016
1017 }
1018
1019 // ------------------------------------------------------------------
1020 // ciMethod::method_data_or_null
1021 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1022 // NULL otherwise.
1023 ciMethodData* ciMethod::method_data_or_null() {
1024 ciMethodData *md = method_data();
1025 if (md->is_empty()) {
1026 return NULL;
1027 }
1028 return md;
1029 }
1030
1031 // ------------------------------------------------------------------
1032 // ciMethod::ensure_method_counters
1033 //
1034 MethodCounters* ciMethod::ensure_method_counters() {
1035 check_is_loaded();
1036 VM_ENTRY_MARK;
1037 methodHandle mh(THREAD, get_Method());
1038 MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1039 return method_counters;
1040 }
1041
1042 // ------------------------------------------------------------------
1043 // ciMethod::has_option
1044 //
1045 bool ciMethod::has_option(const char* option) {
1046 check_is_loaded();
1047 VM_ENTRY_MARK;
1048 methodHandle mh(THREAD, get_Method());
1049 return CompilerOracle::has_option_string(mh, option);
1050 }
1051
1052 // ------------------------------------------------------------------
1053 // ciMethod::has_option_value
1054 //
1055 bool ciMethod::has_option_value(const char* option, double& value) {
1056 check_is_loaded();
1057 VM_ENTRY_MARK;
1058 methodHandle mh(THREAD, get_Method());
1059 return CompilerOracle::has_option_value(mh, option, value);
1060 }
1061 // ------------------------------------------------------------------
1062 // ciMethod::can_be_compiled
1063 //
1064 // Have previous compilations of this method succeeded?
1065 bool ciMethod::can_be_compiled() {
1066 check_is_loaded();
1067 ciEnv* env = CURRENT_ENV;
1068 if (is_c1_compile(env->comp_level())) {
1069 return _is_c1_compilable;
1070 }
1071 return _is_c2_compilable;
1072 }
1073
1074 // ------------------------------------------------------------------
1075 // ciMethod::set_not_compilable
1076 //
1077 // Tell the VM that this method cannot be compiled at all.
1078 void ciMethod::set_not_compilable(const char* reason) {
1079 check_is_loaded();
1080 VM_ENTRY_MARK;
1081 ciEnv* env = CURRENT_ENV;
1082 if (is_c1_compile(env->comp_level())) {
1083 _is_c1_compilable = false;
1084 } else {
1085 _is_c2_compilable = false;
1086 }
1087 get_Method()->set_not_compilable(env->comp_level(), true, reason);
1088 }
1089
1090 // ------------------------------------------------------------------
1091 // ciMethod::can_be_osr_compiled
1092 //
1093 // Have previous compilations of this method succeeded?
1094 //
1095 // Implementation note: the VM does not currently keep track
1096 // of failed OSR compilations per bci. The entry_bci parameter
1097 // is currently unused.
1098 bool ciMethod::can_be_osr_compiled(int entry_bci) {
1099 check_is_loaded();
1100 VM_ENTRY_MARK;
1101 ciEnv* env = CURRENT_ENV;
1102 return !get_Method()->is_not_osr_compilable(env->comp_level());
1103 }
1104
1105 // ------------------------------------------------------------------
1106 // ciMethod::has_compiled_code
1107 bool ciMethod::has_compiled_code() {
1108 return instructions_size() > 0;
1109 }
1110
1111 int ciMethod::comp_level() {
1112 check_is_loaded();
1113 VM_ENTRY_MARK;
1114 CompiledMethod* nm = get_Method()->code();
1115 if (nm != NULL) return nm->comp_level();
1116 return 0;
1117 }
1118
1119 int ciMethod::highest_osr_comp_level() {
1120 check_is_loaded();
1121 VM_ENTRY_MARK;
1122 return get_Method()->highest_osr_comp_level();
1123 }
1124
1125 // ------------------------------------------------------------------
1126 // ciMethod::code_size_for_inlining
1127 //
1128 // Code size for inlining decisions. This method returns a code
1129 // size of 1 for methods which has the ForceInline annotation.
1130 int ciMethod::code_size_for_inlining() {
1131 check_is_loaded();
1132 if (get_Method()->force_inline()) {
1133 return 1;
1134 }
1135 return code_size();
1136 }
1137
1138 // ------------------------------------------------------------------
1139 // ciMethod::instructions_size
1140 //
1141 // This is a rough metric for "fat" methods, compared before inlining
1142 // with InlineSmallCode. The CodeBlob::code_size accessor includes
1143 // junk like exception handler, stubs, and constant table, which are
1144 // not highly relevant to an inlined method. So we use the more
1145 // specific accessor nmethod::insts_size.
1146 int ciMethod::instructions_size() {
1147 if (_instructions_size == -1) {
1148 GUARDED_VM_ENTRY(
1149 CompiledMethod* code = get_Method()->code();
1150 if (code != NULL && (code->comp_level() == CompLevel_full_optimization)) {
1151 _instructions_size = code->insts_end() - code->verified_entry_point();
1152 } else {
1153 _instructions_size = 0;
1154 }
1155 );
1156 }
1157 return _instructions_size;
1158 }
1159
1160 // ------------------------------------------------------------------
1161 // ciMethod::log_nmethod_identity
1162 void ciMethod::log_nmethod_identity(xmlStream* log) {
1163 GUARDED_VM_ENTRY(
1164 CompiledMethod* code = get_Method()->code();
1165 if (code != NULL) {
1166 code->log_identity(log);
1167 }
1168 )
1169 }
1170
1171 // ------------------------------------------------------------------
1172 // ciMethod::is_not_reached
1173 bool ciMethod::is_not_reached(int bci) {
1174 check_is_loaded();
1175 VM_ENTRY_MARK;
1176 return Interpreter::is_not_reached(
1177 methodHandle(THREAD, get_Method()), bci);
1178 }
1179
1180 // ------------------------------------------------------------------
1181 // ciMethod::was_never_executed
1182 bool ciMethod::was_executed_more_than(int times) {
1183 VM_ENTRY_MARK;
1184 return get_Method()->was_executed_more_than(times);
1185 }
1186
1187 // ------------------------------------------------------------------
1188 // ciMethod::has_unloaded_classes_in_signature
1189 bool ciMethod::has_unloaded_classes_in_signature() {
1190 VM_ENTRY_MARK;
1191 {
1192 EXCEPTION_MARK;
1193 methodHandle m(THREAD, get_Method());
1194 bool has_unloaded = Method::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);
1195 if( HAS_PENDING_EXCEPTION ) {
1196 CLEAR_PENDING_EXCEPTION;
1197 return true; // Declare that we may have unloaded classes
1198 }
1199 return has_unloaded;
1200 }
1201 }
1202
1203 // ------------------------------------------------------------------
1204 // ciMethod::is_klass_loaded
1205 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1206 VM_ENTRY_MARK;
1207 return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);
1208 }
1209
1210 // ------------------------------------------------------------------
1211 // ciMethod::check_call
1212 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1213 // This method is used only in C2 from InlineTree::ok_to_inline,
1214 // and is only used under -Xcomp or -XX:CompileTheWorld.
1215 // It appears to fail when applied to an invokeinterface call site.
1216 // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1217 VM_ENTRY_MARK;
1218 {
1219 EXCEPTION_MARK;
1220 HandleMark hm(THREAD);
1221 constantPoolHandle pool (THREAD, get_Method()->constants());
1222 Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1223 methodHandle spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1224 if (HAS_PENDING_EXCEPTION) {
1225 CLEAR_PENDING_EXCEPTION;
1226 return false;
1227 } else {
1228 return (spec_method->is_static() == is_static);
1229 }
1230 }
1231 return false;
1232 }
1233
1234 // ------------------------------------------------------------------
1235 // ciMethod::profile_aging
1236 //
1237 // Should the method be compiled with an age counter?
1238 bool ciMethod::profile_aging() const {
1239 return UseCodeAging && (!MethodCounters::is_nmethod_hot(nmethod_age()) &&
1240 !MethodCounters::is_nmethod_age_unset(nmethod_age()));
1241 }
1242 // ------------------------------------------------------------------
1243 // ciMethod::print_codes
1244 //
1245 // Print the bytecodes for this method.
1246 void ciMethod::print_codes_on(outputStream* st) {
1247 check_is_loaded();
1248 GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1249 }
1250
1251
1252 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1253 check_is_loaded(); \
1254 VM_ENTRY_MARK; \
1255 return get_Method()->flag_accessor(); \
1256 }
1257
1258 bool ciMethod::is_empty_method() const { FETCH_FLAG_FROM_VM(is_empty_method); }
1259 bool ciMethod::is_vanilla_constructor() const { FETCH_FLAG_FROM_VM(is_vanilla_constructor); }
1260 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1261 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1262 bool ciMethod::is_getter () const { FETCH_FLAG_FROM_VM(is_getter); }
1263 bool ciMethod::is_setter () const { FETCH_FLAG_FROM_VM(is_setter); }
1264 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1265 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); }
1266
1267 bool ciMethod::is_boxing_method() const {
1268 if (holder()->is_box_klass()) {
1269 switch (intrinsic_id()) {
1270 case vmIntrinsics::_Boolean_valueOf:
1271 case vmIntrinsics::_Byte_valueOf:
1272 case vmIntrinsics::_Character_valueOf:
1273 case vmIntrinsics::_Short_valueOf:
1274 case vmIntrinsics::_Integer_valueOf:
1275 case vmIntrinsics::_Long_valueOf:
1276 case vmIntrinsics::_Float_valueOf:
1277 case vmIntrinsics::_Double_valueOf:
1278 return true;
1279 default:
1280 return false;
1281 }
1282 }
1283 return false;
1284 }
1285
1286 bool ciMethod::is_unboxing_method() const {
1287 if (holder()->is_box_klass()) {
1288 switch (intrinsic_id()) {
1289 case vmIntrinsics::_booleanValue:
1290 case vmIntrinsics::_byteValue:
1291 case vmIntrinsics::_charValue:
1292 case vmIntrinsics::_shortValue:
1293 case vmIntrinsics::_intValue:
1294 case vmIntrinsics::_longValue:
1295 case vmIntrinsics::_floatValue:
1296 case vmIntrinsics::_doubleValue:
1297 return true;
1298 default:
1299 return false;
1300 }
1301 }
1302 return false;
1303 }
1304
1305 BCEscapeAnalyzer *ciMethod::get_bcea() {
1306 #ifdef COMPILER2
1307 if (_bcea == NULL) {
1308 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1309 }
1310 return _bcea;
1311 #else // COMPILER2
1312 ShouldNotReachHere();
1313 return NULL;
1314 #endif // COMPILER2
1315 }
1316
1317 ciMethodBlocks *ciMethod::get_method_blocks() {
1318 Arena *arena = CURRENT_ENV->arena();
1319 if (_method_blocks == NULL) {
1320 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1321 }
1322 return _method_blocks;
1323 }
1324
1325 #undef FETCH_FLAG_FROM_VM
1326
1327 void ciMethod::dump_name_as_ascii(outputStream* st) {
1328 Method* method = get_Method();
1329 st->print("%s %s %s",
1330 method->klass_name()->as_quoted_ascii(),
1331 method->name()->as_quoted_ascii(),
1332 method->signature()->as_quoted_ascii());
1333 }
1334
1335 void ciMethod::dump_replay_data(outputStream* st) {
1336 ResourceMark rm;
1337 Method* method = get_Method();
1338 MethodCounters* mcs = method->method_counters();
1339 st->print("ciMethod ");
1340 dump_name_as_ascii(st);
1341 st->print_cr(" %d %d %d %d %d",
1342 mcs == NULL ? 0 : mcs->invocation_counter()->raw_counter(),
1343 mcs == NULL ? 0 : mcs->backedge_counter()->raw_counter(),
1344 interpreter_invocation_count(),
1345 interpreter_throwout_count(),
1346 _instructions_size);
1347 }
1348
1349 // ------------------------------------------------------------------
1350 // ciMethod::print_codes
1351 //
1352 // Print a range of the bytecodes for this method.
1353 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1354 check_is_loaded();
1355 GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1356 }
1357
1358 // ------------------------------------------------------------------
1359 // ciMethod::print_name
1360 //
1361 // Print the name of this method, including signature and some flags.
1362 void ciMethod::print_name(outputStream* st) {
1363 check_is_loaded();
1364 GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1365 }
1366
1367 // ------------------------------------------------------------------
1368 // ciMethod::print_short_name
1369 //
1370 // Print the name of this method, without signature.
1371 void ciMethod::print_short_name(outputStream* st) {
1372 if (is_loaded()) {
1373 GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1374 } else {
1375 // Fall back if method is not loaded.
1376 holder()->print_name_on(st);
1377 st->print("::");
1378 name()->print_symbol_on(st);
1379 if (WizardMode)
1380 signature()->as_symbol()->print_symbol_on(st);
1381 }
1382 }
1383
1384 // ------------------------------------------------------------------
1385 // ciMethod::print_impl
1386 //
1387 // Implementation of the print method.
1388 void ciMethod::print_impl(outputStream* st) {
1389 ciMetadata::print_impl(st);
1390 st->print(" name=");
1391 name()->print_symbol_on(st);
1392 st->print(" holder=");
1393 holder()->print_name_on(st);
1394 st->print(" signature=");
1395 signature()->as_symbol()->print_symbol_on(st);
1396 if (is_loaded()) {
1397 st->print(" loaded=true");
1398 st->print(" arg_size=%d", arg_size());
1399 st->print(" flags=");
1400 flags().print_member_flags(st);
1401 } else {
1402 st->print(" loaded=false");
1403 }
1404 }
1405
1406 // ------------------------------------------------------------------
1407
1408 static BasicType erase_to_word_type(BasicType bt) {
1409 if (is_subword_type(bt)) return T_INT;
1410 if (bt == T_ARRAY) return T_OBJECT;
1411 return bt;
1412 }
1413
1414 static bool basic_types_match(ciType* t1, ciType* t2) {
1415 if (t1 == t2) return true;
1416 return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1417 }
1418
1419 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1420 bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1421 !resolved_method->is_method_handle_intrinsic();
1422
1423 if (!invoke_through_mh_intrinsic) {
1424 // Method name & descriptor should stay the same.
1425 // Signatures may reference unloaded types and thus they may be not strictly equal.
1426 ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1427 ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1428
1429 return (declared_method->name()->equals(resolved_method->name())) &&
1430 (declared_signature->equals(resolved_signature));
1431 }
1432
1433 ciMethod* linker = declared_method;
1434 ciMethod* target = resolved_method;
1435 // Linkers have appendix argument which is not passed to callee.
1436 int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1437 if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1438 return false; // argument slot count mismatch
1439 }
1440
1441 ciSignature* linker_sig = linker->signature();
1442 ciSignature* target_sig = target->signature();
1443
1444 if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1445 target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1446 return false; // argument count mismatch
1447 }
1448
1449 int sbase = 0, rbase = 0;
1450 switch (linker->intrinsic_id()) {
1451 case vmIntrinsics::_linkToVirtual:
1452 case vmIntrinsics::_linkToInterface:
1453 case vmIntrinsics::_linkToSpecial: {
1454 if (target->is_static()) {
1455 return false;
1456 }
1457 if (linker_sig->type_at(0)->is_primitive_type()) {
1458 return false; // receiver should be an oop
1459 }
1460 sbase = 1; // skip receiver
1461 break;
1462 }
1463 case vmIntrinsics::_linkToStatic: {
1464 if (!target->is_static()) {
1465 return false;
1466 }
1467 break;
1468 }
1469 case vmIntrinsics::_invokeBasic: {
1470 if (target->is_static()) {
1471 if (target_sig->type_at(0)->is_primitive_type()) {
1472 return false; // receiver should be an oop
1473 }
1474 rbase = 1; // skip receiver
1475 }
1476 break;
1477 }
1478 default:
1479 break;
1480 }
1481 assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1482 int arg_count = target_sig->count() - rbase;
1483 for (int i = 0; i < arg_count; i++) {
1484 if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1485 return false;
1486 }
1487 }
1488 // Only check the return type if the symbolic info has non-void return type.
1489 // I.e. the return value of the resolved method can be dropped.
1490 if (!linker->return_type()->is_void() &&
1491 !basic_types_match(linker->return_type(), target->return_type())) {
1492 return false;
1493 }
1494 return true; // no mismatch found
1495 }
1496
1497 // ------------------------------------------------------------------
1498
1499 #if INCLUDE_TRACE
1500 TraceStructCalleeMethod ciMethod::to_trace_struct() const {
1501 TraceStructCalleeMethod result;
1502 result.set_type(holder()->name()->as_utf8());
1503 result.set_name(name()->as_utf8());
1504 result.set_descriptor(signature()->as_symbol()->as_utf8());
1505 return result;
1506 }
1507 #endif