1 /*
2 * Copyright (c) 1999, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/ciCallProfile.hpp"
27 #include "ci/ciExceptionHandler.hpp"
28 #include "ci/ciInstanceKlass.hpp"
29 #include "ci/ciMethod.hpp"
30 #include "ci/ciMethodBlocks.hpp"
31 #include "ci/ciMethodData.hpp"
32 #include "ci/ciStreams.hpp"
33 #include "ci/ciSymbol.hpp"
34 #include "ci/ciReplay.hpp"
35 #include "ci/ciSymbols.hpp"
36 #include "ci/ciUtilities.inline.hpp"
37 #include "compiler/abstractCompiler.hpp"
38 #include "compiler/compilerDefinitions.inline.hpp"
39 #include "compiler/methodLiveness.hpp"
40 #include "interpreter/interpreter.hpp"
41 #include "interpreter/linkResolver.hpp"
42 #include "interpreter/oopMapCache.hpp"
43 #include "memory/allocation.inline.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "oops/generateOopMap.hpp"
46 #include "oops/method.inline.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "prims/methodHandles.hpp"
49 #include "runtime/deoptimization.hpp"
50 #include "runtime/handles.inline.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 // These fields are always filled in in loaded methods.
77 _flags = ciFlags(h_m->access_flags());
78
79 // Easy to compute, so fill them in now.
80 _max_stack = h_m->max_stack();
81 _max_locals = h_m->max_locals();
82 _code_size = h_m->code_size();
83 _handler_count = h_m->exception_table_length();
84 _size_of_parameters = h_m->size_of_parameters();
85 _uses_monitors = h_m->access_flags().has_monitor_bytecodes();
86 _balanced_monitors = !_uses_monitors || h_m->access_flags().is_monitor_matching();
87 _is_c1_compilable = !h_m->is_not_c1_compilable();
88 _is_c2_compilable = !h_m->is_not_c2_compilable();
89 _can_be_parsed = true;
90 _has_reserved_stack_access = h_m->has_reserved_stack_access();
91 _is_overpass = h_m->is_overpass();
92 // Lazy fields, filled in on demand. Require allocation.
93 _code = NULL;
94 _exception_handlers = NULL;
95 _liveness = NULL;
96 _method_blocks = NULL;
97 #if defined(COMPILER2)
98 _flow = NULL;
99 _bcea = NULL;
100 #endif // COMPILER2
101
102 // Check for blackhole intrinsic and then populate the intrinsic ID.
103 CompilerOracle::tag_blackhole_if_possible(h_m);
104 _intrinsic_id = h_m->intrinsic_id();
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 // Take a snapshot of these values, so they will be commensurate with the MDO.
143 if (ProfileInterpreter || CompilerConfig::is_c1_profiling()) {
144 int invcnt = h_m->interpreter_invocation_count();
145 // if the value overflowed report it as max int
146 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
147 _interpreter_throwout_count = h_m->interpreter_throwout_count();
148 } else {
149 _interpreter_invocation_count = 0;
150 _interpreter_throwout_count = 0;
151 }
152 if (_interpreter_invocation_count == 0)
153 _interpreter_invocation_count = 1;
154 _instructions_size = -1;
155 if (ReplayCompiles) {
156 ciReplay::initialize(this);
157 }
158 }
159
160
161 // ------------------------------------------------------------------
162 // ciMethod::ciMethod
163 //
164 // Unloaded method.
165 ciMethod::ciMethod(ciInstanceKlass* holder,
166 ciSymbol* name,
167 ciSymbol* signature,
168 ciInstanceKlass* accessor) :
169 ciMetadata((Metadata*)NULL),
170 _name( name),
171 _holder( holder),
172 _method_data( NULL),
173 _method_blocks( NULL),
174 _intrinsic_id( vmIntrinsics::_none),
175 _instructions_size(-1),
176 _can_be_statically_bound(false),
177 _can_omit_stack_trace(true),
178 _liveness( NULL)
179 #if defined(COMPILER2)
180 ,
181 _flow( NULL),
182 _bcea( NULL)
183 #endif // COMPILER2
184 {
185 // Usually holder and accessor are the same type but in some cases
186 // the holder has the wrong class loader (e.g. invokedynamic call
187 // sites) so we pass the accessor.
188 _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
189 }
190
191
192 // ------------------------------------------------------------------
193 // ciMethod::load_code
194 //
195 // Load the bytecodes and exception handler table for this method.
196 void ciMethod::load_code() {
197 VM_ENTRY_MARK;
198 assert(is_loaded(), "only loaded methods have code");
199
200 Method* me = get_Method();
201 Arena* arena = CURRENT_THREAD_ENV->arena();
202
203 // Load the bytecodes.
204 _code = (address)arena->Amalloc(code_size());
205 memcpy(_code, me->code_base(), code_size());
206
207 #if INCLUDE_JVMTI
208 // Revert any breakpoint bytecodes in ci's copy
209 if (me->number_of_breakpoints() > 0) {
210 BreakpointInfo* bp = me->method_holder()->breakpoints();
211 for (; bp != NULL; bp = bp->next()) {
212 if (bp->match(me)) {
213 code_at_put(bp->bci(), bp->orig_bytecode());
214 }
215 }
216 }
217 #endif
218
219 // And load the exception table.
220 ExceptionTable exc_table(me);
221
222 // Allocate one extra spot in our list of exceptions. This
223 // last entry will be used to represent the possibility that
224 // an exception escapes the method. See ciExceptionHandlerStream
225 // for details.
226 _exception_handlers =
227 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
228 * (_handler_count + 1));
229 if (_handler_count > 0) {
230 for (int i=0; i<_handler_count; i++) {
231 _exception_handlers[i] = new (arena) ciExceptionHandler(
232 holder(),
233 /* start */ exc_table.start_pc(i),
234 /* limit */ exc_table.end_pc(i),
235 /* goto pc */ exc_table.handler_pc(i),
236 /* cp index */ exc_table.catch_type_index(i));
237 }
238 }
239
240 // Put an entry at the end of our list to represent the possibility
241 // of exceptional exit.
242 _exception_handlers[_handler_count] =
243 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
244
245 if (CIPrintMethodCodes) {
246 print_codes();
247 }
248 }
249
250
251 // ------------------------------------------------------------------
252 // ciMethod::has_linenumber_table
253 //
254 // length unknown until decompression
255 bool ciMethod::has_linenumber_table() const {
256 check_is_loaded();
257 VM_ENTRY_MARK;
258 return get_Method()->has_linenumber_table();
259 }
260
261
262 // ------------------------------------------------------------------
263 // ciMethod::line_number_from_bci
264 int ciMethod::line_number_from_bci(int bci) const {
265 check_is_loaded();
266 VM_ENTRY_MARK;
267 return get_Method()->line_number_from_bci(bci);
268 }
269
270
271 // ------------------------------------------------------------------
272 // ciMethod::vtable_index
273 //
274 // Get the position of this method's entry in the vtable, if any.
275 int ciMethod::vtable_index() {
276 check_is_loaded();
277 assert(holder()->is_linked(), "must be linked");
278 VM_ENTRY_MARK;
279 return get_Method()->vtable_index();
280 }
281
282 // ------------------------------------------------------------------
283 // ciMethod::uses_balanced_monitors
284 //
285 // Does this method use monitors in a strict stack-disciplined manner?
286 bool ciMethod::has_balanced_monitors() {
287 check_is_loaded();
288 if (_balanced_monitors) return true;
289
290 // Analyze the method to see if monitors are used properly.
291 VM_ENTRY_MARK;
292 methodHandle method(THREAD, get_Method());
293 assert(method->has_monitor_bytecodes(), "should have checked this");
294
295 // Check to see if a previous compilation computed the
296 // monitor-matching analysis.
297 if (method->guaranteed_monitor_matching()) {
298 _balanced_monitors = true;
299 return true;
300 }
301
302 {
303 ExceptionMark em(THREAD);
304 ResourceMark rm(THREAD);
305 GeneratePairingInfo gpi(method);
306 if (!gpi.compute_map(THREAD)) {
307 fatal("Unrecoverable verification or out-of-memory error");
308 }
309 if (!gpi.monitor_safe()) {
310 return false;
311 }
312 method->set_guaranteed_monitor_matching();
313 _balanced_monitors = true;
314 }
315 return true;
316 }
317
318
319 // ------------------------------------------------------------------
320 // ciMethod::get_flow_analysis
321 ciTypeFlow* ciMethod::get_flow_analysis() {
322 #if defined(COMPILER2)
323 if (_flow == NULL) {
324 ciEnv* env = CURRENT_ENV;
325 _flow = new (env->arena()) ciTypeFlow(env, this);
326 _flow->do_flow();
327 }
328 return _flow;
329 #else // COMPILER2
330 ShouldNotReachHere();
331 return NULL;
332 #endif // COMPILER2
333 }
334
335
336 // ------------------------------------------------------------------
337 // ciMethod::get_osr_flow_analysis
338 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
339 #if defined(COMPILER2)
340 // OSR entry points are always place after a call bytecode of some sort
341 assert(osr_bci >= 0, "must supply valid OSR entry point");
342 ciEnv* env = CURRENT_ENV;
343 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
344 flow->do_flow();
345 return flow;
346 #else // COMPILER2
347 ShouldNotReachHere();
348 return NULL;
349 #endif // COMPILER2
350 }
351
352 // ------------------------------------------------------------------
353 // ciMethod::raw_liveness_at_bci
354 //
355 // Which local variables are live at a specific bci?
356 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
357 check_is_loaded();
358 if (_liveness == NULL) {
359 // Create the liveness analyzer.
360 Arena* arena = CURRENT_ENV->arena();
361 _liveness = new (arena) MethodLiveness(arena, this);
362 _liveness->compute_liveness();
363 }
364 return _liveness->get_liveness_at(bci);
365 }
366
367 // ------------------------------------------------------------------
368 // ciMethod::liveness_at_bci
369 //
370 // Which local variables are live at a specific bci? When debugging
371 // will return true for all locals in some cases to improve debug
372 // information.
373 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
374 if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot) {
375 // Keep all locals live for the user's edification and amusement.
376 MethodLivenessResult result(_max_locals);
377 result.set_range(0, _max_locals);
378 result.set_is_valid();
379 return result;
380 }
381 return raw_liveness_at_bci(bci);
382 }
383
384 // ciMethod::live_local_oops_at_bci
385 //
386 // find all the live oops in the locals array for a particular bci
387 // Compute what the interpreter believes by using the interpreter
388 // oopmap generator. This is used as a double check during osr to
389 // guard against conservative result from MethodLiveness making us
390 // think a dead oop is live. MethodLiveness is conservative in the
391 // sense that it may consider locals to be live which cannot be live,
392 // like in the case where a local could contain an oop or a primitive
393 // along different paths. In that case the local must be dead when
394 // those paths merge. Since the interpreter's viewpoint is used when
395 // gc'ing an interpreter frame we need to use its viewpoint during
396 // OSR when loading the locals.
397
398 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
399 VM_ENTRY_MARK;
400 InterpreterOopMap mask;
401 OopMapCache::compute_one_oop_map(methodHandle(THREAD, get_Method()), bci, &mask);
402 int mask_size = max_locals();
403 ResourceBitMap result(mask_size);
404 int i;
405 for (i = 0; i < mask_size ; i++ ) {
406 if (mask.is_oop(i)) result.set_bit(i);
407 }
408 return result;
409 }
410
411
412 #ifdef COMPILER1
413 // ------------------------------------------------------------------
414 // ciMethod::bci_block_start
415 //
416 // Marks all bcis where a new basic block starts
417 const BitMap& ciMethod::bci_block_start() {
418 check_is_loaded();
419 if (_liveness == NULL) {
420 // Create the liveness analyzer.
421 Arena* arena = CURRENT_ENV->arena();
422 _liveness = new (arena) MethodLiveness(arena, this);
423 _liveness->compute_liveness();
424 }
425
426 return _liveness->get_bci_block_start();
427 }
428 #endif // COMPILER1
429
430
431 // ------------------------------------------------------------------
432 // ciMethod::check_overflow
433 //
434 // Check whether the profile counter is overflowed and adjust if true.
435 // For invoke* it will turn negative values into max_jint,
436 // and for checkcast/aastore/instanceof turn positive values into min_jint.
437 int ciMethod::check_overflow(int c, Bytecodes::Code code) {
438 switch (code) {
439 case Bytecodes::_aastore: // fall-through
440 case Bytecodes::_checkcast: // fall-through
441 case Bytecodes::_instanceof: {
442 return (c > 0 ? min_jint : c); // always non-positive
443 }
444 default: {
445 assert(Bytecodes::is_invoke(code), "%s", Bytecodes::name(code));
446 return (c < 0 ? max_jint : c); // always non-negative
447 }
448 }
449 }
450
451
452 // ------------------------------------------------------------------
453 // ciMethod::call_profile_at_bci
454 //
455 // Get the ciCallProfile for the invocation of this method.
456 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
457 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
458 ResourceMark rm;
459 ciCallProfile result;
460 if (method_data() != NULL && method_data()->is_mature()) {
461 ciProfileData* data = method_data()->bci_to_data(bci);
462 if (data != NULL && data->is_CounterData()) {
463 // Every profiled call site has a counter.
464 int count = check_overflow(data->as_CounterData()->count(), java_code_at_bci(bci));
465
466 if (!data->is_ReceiverTypeData()) {
467 result._receiver_count[0] = 0; // that's a definite zero
468 } else { // ReceiverTypeData is a subclass of CounterData
469 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
470 // In addition, virtual call sites have receiver type information
471 int receivers_count_total = 0;
472 int morphism = 0;
473 // Precompute morphism for the possible fixup
474 for (uint i = 0; i < call->row_limit(); i++) {
475 ciKlass* receiver = call->receiver(i);
476 if (receiver == NULL) continue;
477 morphism++;
478 }
479 int epsilon = 0;
480 // For a call, it is assumed that either the type of the receiver(s)
481 // is recorded or an associated counter is incremented, but not both. With
482 // tiered compilation, however, both can happen due to the interpreter and
483 // C1 profiling invocations differently. Address that inconsistency here.
484 if (morphism == 1 && count > 0) {
485 epsilon = count;
486 count = 0;
487 }
488 for (uint i = 0; i < call->row_limit(); i++) {
489 ciKlass* receiver = call->receiver(i);
490 if (receiver == NULL) continue;
491 int rcount = saturated_add(call->receiver_count(i), epsilon);
492 if (rcount == 0) rcount = 1; // Should be valid value
493 receivers_count_total = saturated_add(receivers_count_total, rcount);
494 // Add the receiver to result data.
495 result.add_receiver(receiver, rcount);
496 // If we extend profiling to record methods,
497 // we will set result._method also.
498 }
499 // Determine call site's morphism.
500 // The call site count is 0 with known morphism (only 1 or 2 receivers)
501 // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
502 // The call site count is > 0 in the case of a polymorphic virtual call.
503 if (morphism > 0 && morphism == result._limit) {
504 // The morphism <= MorphismLimit.
505 if ((morphism < ciCallProfile::MorphismLimit) ||
506 (morphism == ciCallProfile::MorphismLimit && count == 0)) {
507 #ifdef ASSERT
508 if (count > 0) {
509 this->print_short_name(tty);
510 tty->print_cr(" @ bci:%d", bci);
511 this->print_codes();
512 assert(false, "this call site should not be polymorphic");
513 }
514 #endif
515 result._morphism = morphism;
516 }
517 }
518 // Make the count consistent if this is a call profile. If count is
519 // zero or less, presume that this is a typecheck profile and
520 // do nothing. Otherwise, increase count to be the sum of all
521 // receiver's counts.
522 if (count >= 0) {
523 count = saturated_add(count, receivers_count_total);
524 }
525 }
526 result._count = count;
527 }
528 }
529 return result;
530 }
531
532 // ------------------------------------------------------------------
533 // Add new receiver and sort data by receiver's profile count.
534 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
535 // Add new receiver and sort data by receiver's counts when we have space
536 // for it otherwise replace the less called receiver (less called receiver
537 // is placed to the last array element which is not used).
538 // First array's element contains most called receiver.
539 int i = _limit;
540 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
541 _receiver[i] = _receiver[i-1];
542 _receiver_count[i] = _receiver_count[i-1];
543 }
544 _receiver[i] = receiver;
545 _receiver_count[i] = receiver_count;
546 if (_limit < MorphismLimit) _limit++;
547 }
548
549
550 void ciMethod::assert_virtual_call_type_ok(int bci) {
551 assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
552 java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
553 }
554
555 void ciMethod::assert_call_type_ok(int bci) {
556 assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
557 java_code_at_bci(bci) == Bytecodes::_invokespecial ||
558 java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
559 }
560
561 /**
562 * Check whether profiling provides a type for the argument i to the
563 * call at bci bci
564 *
565 * @param [in]bci bci of the call
566 * @param [in]i argument number
567 * @param [out]type profiled type of argument, NULL if none
568 * @param [out]ptr_kind whether always null, never null or maybe null
569 * @return true if profiling exists
570 *
571 */
572 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
573 if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
574 ciProfileData* data = method_data()->bci_to_data(bci);
575 if (data != NULL) {
576 if (data->is_VirtualCallTypeData()) {
577 assert_virtual_call_type_ok(bci);
578 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
579 if (i >= call->number_of_arguments()) {
580 return false;
581 }
582 type = call->valid_argument_type(i);
583 ptr_kind = call->argument_ptr_kind(i);
584 return true;
585 } else if (data->is_CallTypeData()) {
586 assert_call_type_ok(bci);
587 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
588 if (i >= call->number_of_arguments()) {
589 return false;
590 }
591 type = call->valid_argument_type(i);
592 ptr_kind = call->argument_ptr_kind(i);
593 return true;
594 }
595 }
596 }
597 return false;
598 }
599
600 /**
601 * Check whether profiling provides a type for the return value from
602 * the call at bci bci
603 *
604 * @param [in]bci bci of the call
605 * @param [out]type profiled type of argument, NULL if none
606 * @param [out]ptr_kind whether always null, never null or maybe null
607 * @return true if profiling exists
608 *
609 */
610 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
611 if (MethodData::profile_return() && method_data() != NULL && method_data()->is_mature()) {
612 ciProfileData* data = method_data()->bci_to_data(bci);
613 if (data != NULL) {
614 if (data->is_VirtualCallTypeData()) {
615 assert_virtual_call_type_ok(bci);
616 ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
617 if (call->has_return()) {
618 type = call->valid_return_type();
619 ptr_kind = call->return_ptr_kind();
620 return true;
621 }
622 } else if (data->is_CallTypeData()) {
623 assert_call_type_ok(bci);
624 ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
625 if (call->has_return()) {
626 type = call->valid_return_type();
627 ptr_kind = call->return_ptr_kind();
628 }
629 return true;
630 }
631 }
632 }
633 return false;
634 }
635
636 /**
637 * Check whether profiling provides a type for the parameter i
638 *
639 * @param [in]i parameter number
640 * @param [out]type profiled type of parameter, NULL if none
641 * @param [out]ptr_kind whether always null, never null or maybe null
642 * @return true if profiling exists
643 *
644 */
645 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
646 if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
647 ciParametersTypeData* parameters = method_data()->parameters_type_data();
648 if (parameters != NULL && i < parameters->number_of_parameters()) {
649 type = parameters->valid_parameter_type(i);
650 ptr_kind = parameters->parameter_ptr_kind(i);
651 return true;
652 }
653 }
654 return false;
655 }
656
657
658 // ------------------------------------------------------------------
659 // ciMethod::find_monomorphic_target
660 //
661 // Given a certain calling environment, find the monomorphic target
662 // for the call. Return NULL if the call is not monomorphic in
663 // its calling environment, or if there are only abstract methods.
664 // The returned method is never abstract.
665 // Note: If caller uses a non-null result, it must inform dependencies
666 // via assert_unique_concrete_method or assert_leaf_type.
667 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
668 ciInstanceKlass* callee_holder,
669 ciInstanceKlass* actual_recv,
670 bool check_access) {
671 check_is_loaded();
672
673 if (actual_recv->is_interface()) {
674 // %%% We cannot trust interface types, yet. See bug 6312651.
675 return NULL;
676 }
677
678 ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access, true /* allow_abstract */);
679 if (root_m == NULL) {
680 // Something went wrong looking up the actual receiver method.
681 return NULL;
682 }
683
684 // Make certain quick checks even if UseCHA is false.
685
686 // Is it private or final?
687 if (root_m->can_be_statically_bound()) {
688 assert(!root_m->is_abstract(), "sanity");
689 return root_m;
690 }
691
692 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
693 // Easy case. There is no other place to put a method, so don't bother
694 // to go through the VM_ENTRY_MARK and all the rest.
695 if (root_m->is_abstract()) {
696 return NULL;
697 }
698 return root_m;
699 }
700
701 // Array methods (clone, hashCode, etc.) are always statically bound.
702 // If we were to see an array type here, we'd return root_m.
703 // However, this method processes only ciInstanceKlasses. (See 4962591.)
704 // The inline_native_clone intrinsic narrows Object to T[] properly,
705 // so there is no need to do the same job here.
706
707 if (!UseCHA) return NULL;
708
709 VM_ENTRY_MARK;
710
711 methodHandle target;
712 {
713 MutexLocker locker(Compile_lock);
714 InstanceKlass* context = actual_recv->get_instanceKlass();
715 if (UseVtableBasedCHA) {
716 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context,
717 root_m->get_Method(),
718 callee_holder->get_Klass(),
719 this->get_Method()));
720 } else {
721 if (root_m->is_abstract()) {
722 return NULL; // not supported
723 }
724 target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context, root_m->get_Method()));
725 }
726 assert(target() == NULL || !target()->is_abstract(), "not allowed");
727 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
728 }
729
730 #ifndef PRODUCT
731 if (TraceDependencies && target() != NULL && target() != root_m->get_Method()) {
732 tty->print("found a non-root unique target method");
733 tty->print_cr(" context = %s", actual_recv->get_Klass()->external_name());
734 tty->print(" method = ");
735 target->print_short_name(tty);
736 tty->cr();
737 }
738 #endif //PRODUCT
739
740 if (target() == NULL) {
741 return NULL;
742 }
743 if (target() == root_m->get_Method()) {
744 return root_m;
745 }
746 if (!root_m->is_public() &&
747 !root_m->is_protected()) {
748 // If we are going to reason about inheritance, it's easiest
749 // if the method in question is public, protected, or private.
750 // If the answer is not root_m, it is conservatively correct
751 // to return NULL, even if the CHA encountered irrelevant
752 // methods in other packages.
753 // %%% TO DO: Work out logic for package-private methods
754 // with the same name but different vtable indexes.
755 return NULL;
756 }
757 return CURRENT_THREAD_ENV->get_method(target());
758 }
759
760 // ------------------------------------------------------------------
761 // ciMethod::can_be_statically_bound
762 //
763 // Tries to determine whether a method can be statically bound in some context.
764 bool ciMethod::can_be_statically_bound(ciInstanceKlass* context) const {
765 return (holder() == context) && can_be_statically_bound();
766 }
767
768 // ------------------------------------------------------------------
769 // ciMethod::can_omit_stack_trace
770 //
771 // Tries to determine whether a method can omit stack trace in throw in compiled code.
772 bool ciMethod::can_omit_stack_trace() const {
773 if (!StackTraceInThrowable) {
774 return true; // stack trace is switched off.
775 }
776 if (!OmitStackTraceInFastThrow) {
777 return false; // Have to provide stack trace.
778 }
779 return _can_omit_stack_trace;
780 }
781
782 // ------------------------------------------------------------------
783 // ciMethod::resolve_invoke
784 //
785 // Given a known receiver klass, find the target for the call.
786 // Return NULL if the call has no target or the target is abstract.
787 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access, bool allow_abstract) {
788 check_is_loaded();
789 VM_ENTRY_MARK;
790
791 Klass* caller_klass = caller->get_Klass();
792 Klass* recv = exact_receiver->get_Klass();
793 Klass* resolved = holder()->get_Klass();
794 Symbol* h_name = name()->get_symbol();
795 Symbol* h_signature = signature()->get_symbol();
796
797 LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
798 check_access ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
799 check_access ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
800 Method* m = NULL;
801 // Only do exact lookup if receiver klass has been linked. Otherwise,
802 // the vtable has not been setup, and the LinkResolver will fail.
803 if (recv->is_array_klass()
804 ||
805 (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
806 if (holder()->is_interface()) {
807 m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
808 } else {
809 m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
810 }
811 }
812
813 if (m == NULL) {
814 // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
815 return NULL;
816 }
817
818 ciMethod* result = this;
819 if (m != get_Method()) {
820 result = CURRENT_THREAD_ENV->get_method(m);
821 }
822
823 if (result->is_abstract() && !allow_abstract) {
824 // Don't return abstract methods because they aren't optimizable or interesting.
825 return NULL;
826 }
827 return result;
828 }
829
830 // ------------------------------------------------------------------
831 // ciMethod::resolve_vtable_index
832 //
833 // Given a known receiver klass, find the vtable index for the call.
834 // Return Method::invalid_vtable_index if the vtable_index is unknown.
835 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
836 check_is_loaded();
837
838 int vtable_index = Method::invalid_vtable_index;
839 // Only do lookup if receiver klass has been linked. Otherwise,
840 // the vtable has not been setup, and the LinkResolver will fail.
841 if (!receiver->is_interface()
842 && (!receiver->is_instance_klass() ||
843 receiver->as_instance_klass()->is_linked())) {
844 VM_ENTRY_MARK;
845
846 Klass* caller_klass = caller->get_Klass();
847 Klass* recv = receiver->get_Klass();
848 Symbol* h_name = name()->get_symbol();
849 Symbol* h_signature = signature()->get_symbol();
850
851 LinkInfo link_info(recv, h_name, h_signature, caller_klass);
852 vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
853 if (vtable_index == Method::nonvirtual_vtable_index) {
854 // A statically bound method. Return "no such index".
855 vtable_index = Method::invalid_vtable_index;
856 }
857 }
858
859 return vtable_index;
860 }
861
862 // ------------------------------------------------------------------
863 // ciMethod::get_field_at_bci
864 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
865 ciBytecodeStream iter(this);
866 iter.reset_to_bci(bci);
867 iter.next();
868 return iter.get_field(will_link);
869 }
870
871 // ------------------------------------------------------------------
872 // ciMethod::get_method_at_bci
873 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
874 ciBytecodeStream iter(this);
875 iter.reset_to_bci(bci);
876 iter.next();
877 return iter.get_method(will_link, declared_signature);
878 }
879
880 // ------------------------------------------------------------------
881 ciKlass* ciMethod::get_declared_method_holder_at_bci(int bci) {
882 ciBytecodeStream iter(this);
883 iter.reset_to_bci(bci);
884 iter.next();
885 return iter.get_declared_method_holder();
886 }
887
888 // ------------------------------------------------------------------
889 // Adjust a CounterData count to be commensurate with
890 // interpreter_invocation_count. If the MDO exists for
891 // only 25% of the time the method exists, then the
892 // counts in the MDO should be scaled by 4X, so that
893 // they can be usefully and stably compared against the
894 // invocation counts in methods.
895 int ciMethod::scale_count(int count, float prof_factor) {
896 if (count > 0 && method_data() != NULL) {
897 int counter_life = method_data()->invocation_count();
898 int method_life = interpreter_invocation_count();
899 if (method_life < counter_life) { // may happen because of the snapshot timing
900 method_life = counter_life;
901 }
902 if (counter_life > 0) {
903 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
904 count = (count > 0) ? count : 1;
905 } else {
906 count = 1;
907 }
908 }
909 return count;
910 }
911
912
913 // ------------------------------------------------------------------
914 // ciMethod::is_special_get_caller_class_method
915 //
916 bool ciMethod::is_ignored_by_security_stack_walk() const {
917 check_is_loaded();
918 VM_ENTRY_MARK;
919 return get_Method()->is_ignored_by_security_stack_walk();
920 }
921
922 // ------------------------------------------------------------------
923 // ciMethod::needs_clinit_barrier
924 //
925 bool ciMethod::needs_clinit_barrier() const {
926 check_is_loaded();
927 return is_static() && !holder()->is_initialized();
928 }
929
930 // ------------------------------------------------------------------
931 // invokedynamic support
932
933 // ------------------------------------------------------------------
934 // ciMethod::is_method_handle_intrinsic
935 //
936 // Return true if the method is an instance of the JVM-generated
937 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
938 bool ciMethod::is_method_handle_intrinsic() const {
939 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
940 return (MethodHandles::is_signature_polymorphic(iid) &&
941 MethodHandles::is_signature_polymorphic_intrinsic(iid));
942 }
943
944 // ------------------------------------------------------------------
945 // ciMethod::is_compiled_lambda_form
946 //
947 // Return true if the method is a generated MethodHandle adapter.
948 // These are built by Java code.
949 bool ciMethod::is_compiled_lambda_form() const {
950 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
951 return iid == vmIntrinsics::_compiledLambdaForm;
952 }
953
954 // ------------------------------------------------------------------
955 // ciMethod::is_object_initializer
956 //
957 bool ciMethod::is_object_initializer() const {
958 return name() == ciSymbols::object_initializer_name();
959 }
960
961 // ------------------------------------------------------------------
962 // ciMethod::has_member_arg
963 //
964 // Return true if the method is a linker intrinsic like _linkToVirtual.
965 // These are built by the JVM.
966 bool ciMethod::has_member_arg() const {
967 vmIntrinsics::ID iid = _intrinsic_id; // do not check if loaded
968 return (MethodHandles::is_signature_polymorphic(iid) &&
969 MethodHandles::has_member_arg(iid));
970 }
971
972 // ------------------------------------------------------------------
973 // ciMethod::ensure_method_data
974 //
975 // Generate new MethodData* objects at compile time.
976 // Return true if allocation was successful or no MDO is required.
977 bool ciMethod::ensure_method_data(const methodHandle& h_m) {
978 EXCEPTION_CONTEXT;
979 if (is_native() || is_abstract() || h_m()->is_accessor()) {
980 return true;
981 }
982 if (h_m()->method_data() == NULL) {
983 Method::build_profiling_method_data(h_m, THREAD);
984 if (HAS_PENDING_EXCEPTION) {
985 CLEAR_PENDING_EXCEPTION;
986 }
987 }
988 if (h_m()->method_data() != NULL) {
989 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
990 return _method_data->load_data();
991 } else {
992 _method_data = CURRENT_ENV->get_empty_methodData();
993 return false;
994 }
995 }
996
997 // public, retroactive version
998 bool ciMethod::ensure_method_data() {
999 bool result = true;
1000 if (_method_data == NULL || _method_data->is_empty()) {
1001 GUARDED_VM_ENTRY({
1002 methodHandle mh(Thread::current(), get_Method());
1003 result = ensure_method_data(mh);
1004 });
1005 }
1006 return result;
1007 }
1008
1009
1010 // ------------------------------------------------------------------
1011 // ciMethod::method_data
1012 //
1013 ciMethodData* ciMethod::method_data() {
1014 if (_method_data != NULL) {
1015 return _method_data;
1016 }
1017 VM_ENTRY_MARK;
1018 ciEnv* env = CURRENT_ENV;
1019 Thread* my_thread = JavaThread::current();
1020 methodHandle h_m(my_thread, get_Method());
1021
1022 if (h_m()->method_data() != NULL) {
1023 _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1024 _method_data->load_data();
1025 } else {
1026 _method_data = CURRENT_ENV->get_empty_methodData();
1027 }
1028 return _method_data;
1029
1030 }
1031
1032 // ------------------------------------------------------------------
1033 // ciMethod::method_data_or_null
1034 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1035 // NULL otherwise.
1036 ciMethodData* ciMethod::method_data_or_null() {
1037 ciMethodData *md = method_data();
1038 if (md->is_empty()) {
1039 return NULL;
1040 }
1041 return md;
1042 }
1043
1044 // ------------------------------------------------------------------
1045 // ciMethod::ensure_method_counters
1046 //
1047 MethodCounters* ciMethod::ensure_method_counters() {
1048 check_is_loaded();
1049 VM_ENTRY_MARK;
1050 methodHandle mh(THREAD, get_Method());
1051 MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1052 return method_counters;
1053 }
1054
1055 // ------------------------------------------------------------------
1056 // ciMethod::has_option
1057 //
1058 bool ciMethod::has_option(enum CompileCommand option) {
1059 check_is_loaded();
1060 VM_ENTRY_MARK;
1061 methodHandle mh(THREAD, get_Method());
1062 return CompilerOracle::has_option(mh, option);
1063 }
1064
1065 // ------------------------------------------------------------------
1066 // ciMethod::has_option_value
1067 //
1068 bool ciMethod::has_option_value(enum CompileCommand option, double& value) {
1069 check_is_loaded();
1070 VM_ENTRY_MARK;
1071 methodHandle mh(THREAD, get_Method());
1072 return CompilerOracle::has_option_value(mh, option, value);
1073 }
1074 // ------------------------------------------------------------------
1075 // ciMethod::can_be_compiled
1076 //
1077 // Have previous compilations of this method succeeded?
1078 bool ciMethod::can_be_compiled() {
1079 check_is_loaded();
1080 ciEnv* env = CURRENT_ENV;
1081 if (is_c1_compile(env->comp_level())) {
1082 return _is_c1_compilable;
1083 }
1084 return _is_c2_compilable;
1085 }
1086
1087 // ------------------------------------------------------------------
1088 // ciMethod::has_compiled_code
1089 bool ciMethod::has_compiled_code() {
1090 return instructions_size() > 0;
1091 }
1092
1093 int ciMethod::highest_osr_comp_level() {
1094 check_is_loaded();
1095 VM_ENTRY_MARK;
1096 return get_Method()->highest_osr_comp_level();
1097 }
1098
1099 // ------------------------------------------------------------------
1100 // ciMethod::code_size_for_inlining
1101 //
1102 // Code size for inlining decisions. This method returns a code
1103 // size of 1 for methods which has the ForceInline annotation.
1104 int ciMethod::code_size_for_inlining() {
1105 check_is_loaded();
1106 if (get_Method()->force_inline()) {
1107 return 1;
1108 }
1109 return code_size();
1110 }
1111
1112 // ------------------------------------------------------------------
1113 // ciMethod::instructions_size
1114 //
1115 // This is a rough metric for "fat" methods, compared before inlining
1116 // with InlineSmallCode. The CodeBlob::code_size accessor includes
1117 // junk like exception handler, stubs, and constant table, which are
1118 // not highly relevant to an inlined method. So we use the more
1119 // specific accessor nmethod::insts_size.
1120 int ciMethod::instructions_size() {
1121 if (_instructions_size == -1) {
1122 GUARDED_VM_ENTRY(
1123 CompiledMethod* code = get_Method()->code();
1124 if (code != NULL && (code->comp_level() == CompLevel_full_optimization)) {
1125 _instructions_size = code->insts_end() - code->verified_entry_point();
1126 } else {
1127 _instructions_size = 0;
1128 }
1129 );
1130 }
1131 return _instructions_size;
1132 }
1133
1134 // ------------------------------------------------------------------
1135 // ciMethod::log_nmethod_identity
1136 void ciMethod::log_nmethod_identity(xmlStream* log) {
1137 GUARDED_VM_ENTRY(
1138 CompiledMethod* code = get_Method()->code();
1139 if (code != NULL) {
1140 code->log_identity(log);
1141 }
1142 )
1143 }
1144
1145 // ------------------------------------------------------------------
1146 // ciMethod::is_not_reached
1147 bool ciMethod::is_not_reached(int bci) {
1148 check_is_loaded();
1149 VM_ENTRY_MARK;
1150 return Interpreter::is_not_reached(
1151 methodHandle(THREAD, get_Method()), bci);
1152 }
1153
1154 // ------------------------------------------------------------------
1155 // ciMethod::was_never_executed
1156 bool ciMethod::was_executed_more_than(int times) {
1157 VM_ENTRY_MARK;
1158 return get_Method()->was_executed_more_than(times);
1159 }
1160
1161 // ------------------------------------------------------------------
1162 // ciMethod::has_unloaded_classes_in_signature
1163 bool ciMethod::has_unloaded_classes_in_signature() {
1164 // ciSignature is resolved against some accessing class and
1165 // signature classes aren't required to be local. As a benefit,
1166 // it makes signature classes visible through loader constraints.
1167 // So, encountering an unloaded class signals it is absent both in
1168 // the callee (local) and caller contexts.
1169 return signature()->has_unloaded_classes();
1170 }
1171
1172 // ------------------------------------------------------------------
1173 // ciMethod::is_klass_loaded
1174 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1175 VM_ENTRY_MARK;
1176 return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);
1177 }
1178
1179 // ------------------------------------------------------------------
1180 // ciMethod::check_call
1181 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1182 // This method is used only in C2 from InlineTree::ok_to_inline,
1183 // and is only used under -Xcomp.
1184 // It appears to fail when applied to an invokeinterface call site.
1185 // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1186 VM_ENTRY_MARK;
1187 {
1188 ExceptionMark em(THREAD);
1189 HandleMark hm(THREAD);
1190 constantPoolHandle pool (THREAD, get_Method()->constants());
1191 Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1192 Method* spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1193 if (HAS_PENDING_EXCEPTION) {
1194 CLEAR_PENDING_EXCEPTION;
1195 return false;
1196 } else {
1197 return (spec_method->is_static() == is_static);
1198 }
1199 }
1200 return false;
1201 }
1202 // ------------------------------------------------------------------
1203 // ciMethod::print_codes
1204 //
1205 // Print the bytecodes for this method.
1206 void ciMethod::print_codes_on(outputStream* st) {
1207 check_is_loaded();
1208 GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1209 }
1210
1211
1212 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1213 check_is_loaded(); \
1214 VM_ENTRY_MARK; \
1215 return get_Method()->flag_accessor(); \
1216 }
1217
1218 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1219 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1220 bool ciMethod::is_getter () const { FETCH_FLAG_FROM_VM(is_getter); }
1221 bool ciMethod::is_setter () const { FETCH_FLAG_FROM_VM(is_setter); }
1222 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1223 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); }
1224 bool ciMethod::is_empty () const { FETCH_FLAG_FROM_VM(is_empty_method); }
1225
1226 bool ciMethod::is_boxing_method() const {
1227 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1228 switch (intrinsic_id()) {
1229 case vmIntrinsics::_Boolean_valueOf:
1230 case vmIntrinsics::_Byte_valueOf:
1231 case vmIntrinsics::_Character_valueOf:
1232 case vmIntrinsics::_Short_valueOf:
1233 case vmIntrinsics::_Integer_valueOf:
1234 case vmIntrinsics::_Long_valueOf:
1235 case vmIntrinsics::_Float_valueOf:
1236 case vmIntrinsics::_Double_valueOf:
1237 return true;
1238 default:
1239 return false;
1240 }
1241 }
1242 return false;
1243 }
1244
1245 bool ciMethod::is_unboxing_method() const {
1246 if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1247 switch (intrinsic_id()) {
1248 case vmIntrinsics::_booleanValue:
1249 case vmIntrinsics::_byteValue:
1250 case vmIntrinsics::_charValue:
1251 case vmIntrinsics::_shortValue:
1252 case vmIntrinsics::_intValue:
1253 case vmIntrinsics::_longValue:
1254 case vmIntrinsics::_floatValue:
1255 case vmIntrinsics::_doubleValue:
1256 return true;
1257 default:
1258 return false;
1259 }
1260 }
1261 return false;
1262 }
1263
1264 bool ciMethod::is_vector_method() const {
1265 return (holder() == ciEnv::current()->vector_VectorSupport_klass()) &&
1266 (intrinsic_id() != vmIntrinsics::_none);
1267 }
1268
1269 BCEscapeAnalyzer *ciMethod::get_bcea() {
1270 #ifdef COMPILER2
1271 if (_bcea == NULL) {
1272 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1273 }
1274 return _bcea;
1275 #else // COMPILER2
1276 ShouldNotReachHere();
1277 return NULL;
1278 #endif // COMPILER2
1279 }
1280
1281 ciMethodBlocks *ciMethod::get_method_blocks() {
1282 if (_method_blocks == NULL) {
1283 Arena *arena = CURRENT_ENV->arena();
1284 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1285 }
1286 return _method_blocks;
1287 }
1288
1289 #undef FETCH_FLAG_FROM_VM
1290
1291 void ciMethod::dump_name_as_ascii(outputStream* st, Method* method) {
1292 st->print("%s %s %s",
1293 CURRENT_ENV->replay_name(method->method_holder()),
1294 method->name()->as_quoted_ascii(),
1295 method->signature()->as_quoted_ascii());
1296 }
1297
1298 void ciMethod::dump_name_as_ascii(outputStream* st) {
1299 Method* method = get_Method();
1300 dump_name_as_ascii(st, method);
1301 }
1302
1303 void ciMethod::dump_replay_data(outputStream* st) {
1304 ResourceMark rm;
1305 Method* method = get_Method();
1306 if (MethodHandles::is_signature_polymorphic_method(method)) {
1307 // ignore for now
1308 return;
1309 }
1310 MethodCounters* mcs = method->method_counters();
1311 st->print("ciMethod ");
1312 dump_name_as_ascii(st);
1313 st->print_cr(" %d %d %d %d %d",
1314 mcs == NULL ? 0 : mcs->invocation_counter()->raw_counter(),
1315 mcs == NULL ? 0 : mcs->backedge_counter()->raw_counter(),
1316 interpreter_invocation_count(),
1317 interpreter_throwout_count(),
1318 _instructions_size);
1319 }
1320
1321 // ------------------------------------------------------------------
1322 // ciMethod::print_codes
1323 //
1324 // Print a range of the bytecodes for this method.
1325 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1326 check_is_loaded();
1327 GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1328 }
1329
1330 // ------------------------------------------------------------------
1331 // ciMethod::print_name
1332 //
1333 // Print the name of this method, including signature and some flags.
1334 void ciMethod::print_name(outputStream* st) {
1335 check_is_loaded();
1336 GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1337 }
1338
1339 // ------------------------------------------------------------------
1340 // ciMethod::print_short_name
1341 //
1342 // Print the name of this method, without signature.
1343 void ciMethod::print_short_name(outputStream* st) {
1344 if (is_loaded()) {
1345 GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1346 } else {
1347 // Fall back if method is not loaded.
1348 holder()->print_name_on(st);
1349 st->print("::");
1350 name()->print_symbol_on(st);
1351 if (WizardMode)
1352 signature()->as_symbol()->print_symbol_on(st);
1353 }
1354 }
1355
1356 // ------------------------------------------------------------------
1357 // ciMethod::print_impl
1358 //
1359 // Implementation of the print method.
1360 void ciMethod::print_impl(outputStream* st) {
1361 ciMetadata::print_impl(st);
1362 st->print(" name=");
1363 name()->print_symbol_on(st);
1364 st->print(" holder=");
1365 holder()->print_name_on(st);
1366 st->print(" signature=");
1367 signature()->as_symbol()->print_symbol_on(st);
1368 if (is_loaded()) {
1369 st->print(" loaded=true");
1370 st->print(" arg_size=%d", arg_size());
1371 st->print(" flags=");
1372 flags().print_member_flags(st);
1373 } else {
1374 st->print(" loaded=false");
1375 }
1376 }
1377
1378 // ------------------------------------------------------------------
1379
1380 static BasicType erase_to_word_type(BasicType bt) {
1381 if (is_subword_type(bt)) return T_INT;
1382 if (is_reference_type(bt)) return T_OBJECT;
1383 return bt;
1384 }
1385
1386 static bool basic_types_match(ciType* t1, ciType* t2) {
1387 if (t1 == t2) return true;
1388 return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1389 }
1390
1391 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1392 bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1393 !resolved_method->is_method_handle_intrinsic();
1394
1395 if (!invoke_through_mh_intrinsic) {
1396 // Method name & descriptor should stay the same.
1397 // Signatures may reference unloaded types and thus they may be not strictly equal.
1398 ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1399 ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1400
1401 return (declared_method->name()->equals(resolved_method->name())) &&
1402 (declared_signature->equals(resolved_signature));
1403 }
1404
1405 ciMethod* linker = declared_method;
1406 ciMethod* target = resolved_method;
1407 // Linkers have appendix argument which is not passed to callee.
1408 int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1409 if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1410 return false; // argument slot count mismatch
1411 }
1412
1413 ciSignature* linker_sig = linker->signature();
1414 ciSignature* target_sig = target->signature();
1415
1416 if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1417 target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1418 return false; // argument count mismatch
1419 }
1420
1421 int sbase = 0, rbase = 0;
1422 switch (linker->intrinsic_id()) {
1423 case vmIntrinsics::_linkToVirtual:
1424 case vmIntrinsics::_linkToInterface:
1425 case vmIntrinsics::_linkToSpecial: {
1426 if (target->is_static()) {
1427 return false;
1428 }
1429 if (linker_sig->type_at(0)->is_primitive_type()) {
1430 return false; // receiver should be an oop
1431 }
1432 sbase = 1; // skip receiver
1433 break;
1434 }
1435 case vmIntrinsics::_linkToStatic: {
1436 if (!target->is_static()) {
1437 return false;
1438 }
1439 break;
1440 }
1441 case vmIntrinsics::_invokeBasic: {
1442 if (target->is_static()) {
1443 if (target_sig->type_at(0)->is_primitive_type()) {
1444 return false; // receiver should be an oop
1445 }
1446 rbase = 1; // skip receiver
1447 }
1448 break;
1449 }
1450 default:
1451 break;
1452 }
1453 assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1454 int arg_count = target_sig->count() - rbase;
1455 for (int i = 0; i < arg_count; i++) {
1456 if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1457 return false;
1458 }
1459 }
1460 // Only check the return type if the symbolic info has non-void return type.
1461 // I.e. the return value of the resolved method can be dropped.
1462 if (!linker->return_type()->is_void() &&
1463 !basic_types_match(linker->return_type(), target->return_type())) {
1464 return false;
1465 }
1466 return true; // no mismatch found
1467 }
1468
1469 // ------------------------------------------------------------------