1 /*
2 * Copyright (c) 1999, 2010, 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/ciMethodKlass.hpp"
33 #include "ci/ciStreams.hpp"
34 #include "ci/ciSymbol.hpp"
35 #include "ci/ciUtilities.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "compiler/abstractCompiler.hpp"
38 #include "compiler/compilerOracle.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/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 #ifdef COMPILER2
52 #include "ci/bcEscapeAnalyzer.hpp"
53 #include "ci/ciTypeFlow.hpp"
54 #include "oops/methodOop.hpp"
55 #endif
56 #ifdef SHARK
57 #include "ci/ciTypeFlow.hpp"
58 #include "oops/methodOop.hpp"
59 #endif
60
61 // ciMethod
62 //
63 // This class represents a methodOop in the HotSpot virtual
64 // machine.
65
66
67 // ------------------------------------------------------------------
68 // ciMethod::ciMethod
69 //
70 // Loaded method.
71 ciMethod::ciMethod(methodHandle h_m) : ciObject(h_m) {
72 assert(h_m() != NULL, "no null method");
73
74 // These fields are always filled in in loaded methods.
75 _flags = ciFlags(h_m()->access_flags());
76
77 // Easy to compute, so fill them in now.
78 _max_stack = h_m()->max_stack();
79 _max_locals = h_m()->max_locals();
80 _code_size = h_m()->code_size();
81 _intrinsic_id = h_m()->intrinsic_id();
82 _handler_count = h_m()->exception_table()->length() / 4;
83 _uses_monitors = h_m()->access_flags().has_monitor_bytecodes();
84 _balanced_monitors = !_uses_monitors || h_m()->access_flags().is_monitor_matching();
85 _is_c1_compilable = !h_m()->is_not_c1_compilable();
86 _is_c2_compilable = !h_m()->is_not_c2_compilable();
87 // Lazy fields, filled in on demand. Require allocation.
88 _code = NULL;
89 _exception_handlers = NULL;
90 _liveness = NULL;
91 _method_blocks = NULL;
92 #if defined(COMPILER2) || defined(SHARK)
93 _flow = NULL;
94 _bcea = NULL;
95 #endif // COMPILER2 || SHARK
96
97 ciEnv *env = CURRENT_ENV;
98 if (env->jvmti_can_hotswap_or_post_breakpoint() && can_be_compiled()) {
99 // 6328518 check hotswap conditions under the right lock.
100 MutexLocker locker(Compile_lock);
101 if (Dependencies::check_evol_method(h_m()) != NULL) {
102 _is_c1_compilable = false;
103 _is_c2_compilable = false;
104 }
105 } else {
106 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
107 }
108
109 if (instanceKlass::cast(h_m()->method_holder())->is_linked()) {
110 _can_be_statically_bound = h_m()->can_be_statically_bound();
111 } else {
112 // Have to use a conservative value in this case.
113 _can_be_statically_bound = false;
114 }
115
116 // Adjust the definition of this condition to be more useful:
117 // %%% take these conditions into account in vtable generation
118 if (!_can_be_statically_bound && h_m()->is_private())
119 _can_be_statically_bound = true;
120 if (_can_be_statically_bound && h_m()->is_abstract())
121 _can_be_statically_bound = false;
122
123 // generating _signature may allow GC and therefore move m.
124 // These fields are always filled in.
125 _name = env->get_object(h_m()->name())->as_symbol();
126 _holder = env->get_object(h_m()->method_holder())->as_instance_klass();
127 ciSymbol* sig_symbol = env->get_object(h_m()->signature())->as_symbol();
128 _signature = new (env->arena()) ciSignature(_holder, sig_symbol);
129 _method_data = NULL;
130 // Take a snapshot of these values, so they will be commensurate with the MDO.
131 if (ProfileInterpreter || TieredCompilation) {
132 int invcnt = h_m()->interpreter_invocation_count();
133 // if the value overflowed report it as max int
134 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
135 _interpreter_throwout_count = h_m()->interpreter_throwout_count();
136 } else {
137 _interpreter_invocation_count = 0;
138 _interpreter_throwout_count = 0;
139 }
140 if (_interpreter_invocation_count == 0)
141 _interpreter_invocation_count = 1;
142 }
143
144
145 // ------------------------------------------------------------------
146 // ciMethod::ciMethod
147 //
148 // Unloaded method.
149 ciMethod::ciMethod(ciInstanceKlass* holder,
150 ciSymbol* name,
151 ciSymbol* signature) : ciObject(ciMethodKlass::make()) {
152 // These fields are always filled in.
153 _name = name;
154 _holder = holder;
155 _signature = new (CURRENT_ENV->arena()) ciSignature(_holder, signature);
156 _intrinsic_id = vmIntrinsics::_none;
157 _liveness = NULL;
158 _can_be_statically_bound = false;
159 _method_blocks = NULL;
160 _method_data = NULL;
161 #if defined(COMPILER2) || defined(SHARK)
162 _flow = NULL;
163 _bcea = NULL;
164 #endif // COMPILER2 || SHARK
165 }
166
167
168 // ------------------------------------------------------------------
169 // ciMethod::load_code
170 //
171 // Load the bytecodes and exception handler table for this method.
172 void ciMethod::load_code() {
173 VM_ENTRY_MARK;
174 assert(is_loaded(), "only loaded methods have code");
175
176 methodOop me = get_methodOop();
177 Arena* arena = CURRENT_THREAD_ENV->arena();
178
179 // Load the bytecodes.
180 _code = (address)arena->Amalloc(code_size());
181 memcpy(_code, me->code_base(), code_size());
182
183 // Revert any breakpoint bytecodes in ci's copy
184 if (me->number_of_breakpoints() > 0) {
185 BreakpointInfo* bp = instanceKlass::cast(me->method_holder())->breakpoints();
186 for (; bp != NULL; bp = bp->next()) {
187 if (bp->match(me)) {
188 code_at_put(bp->bci(), bp->orig_bytecode());
189 }
190 }
191 }
192
193 // And load the exception table.
194 typeArrayOop exc_table = me->exception_table();
195
196 // Allocate one extra spot in our list of exceptions. This
197 // last entry will be used to represent the possibility that
198 // an exception escapes the method. See ciExceptionHandlerStream
199 // for details.
200 _exception_handlers =
201 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
202 * (_handler_count + 1));
203 if (_handler_count > 0) {
204 for (int i=0; i<_handler_count; i++) {
205 int base = i*4;
206 _exception_handlers[i] = new (arena) ciExceptionHandler(
207 holder(),
208 /* start */ exc_table->int_at(base),
209 /* limit */ exc_table->int_at(base+1),
210 /* goto pc */ exc_table->int_at(base+2),
211 /* cp index */ exc_table->int_at(base+3));
212 }
213 }
214
215 // Put an entry at the end of our list to represent the possibility
216 // of exceptional exit.
217 _exception_handlers[_handler_count] =
218 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
219
220 if (CIPrintMethodCodes) {
221 print_codes();
222 }
223 }
224
225
226 // ------------------------------------------------------------------
227 // ciMethod::has_linenumber_table
228 //
229 // length unknown until decompression
230 bool ciMethod::has_linenumber_table() const {
231 check_is_loaded();
232 VM_ENTRY_MARK;
233 return get_methodOop()->has_linenumber_table();
234 }
235
236
237 // ------------------------------------------------------------------
238 // ciMethod::compressed_linenumber_table
239 u_char* ciMethod::compressed_linenumber_table() const {
240 check_is_loaded();
241 VM_ENTRY_MARK;
242 return get_methodOop()->compressed_linenumber_table();
243 }
244
245
246 // ------------------------------------------------------------------
247 // ciMethod::line_number_from_bci
248 int ciMethod::line_number_from_bci(int bci) const {
249 check_is_loaded();
250 VM_ENTRY_MARK;
251 return get_methodOop()->line_number_from_bci(bci);
252 }
253
254
255 // ------------------------------------------------------------------
256 // ciMethod::vtable_index
257 //
258 // Get the position of this method's entry in the vtable, if any.
259 int ciMethod::vtable_index() {
260 check_is_loaded();
261 assert(holder()->is_linked(), "must be linked");
262 VM_ENTRY_MARK;
263 return get_methodOop()->vtable_index();
264 }
265
266
267 #ifdef SHARK
268 // ------------------------------------------------------------------
269 // ciMethod::itable_index
270 //
271 // Get the position of this method's entry in the itable, if any.
272 int ciMethod::itable_index() {
273 check_is_loaded();
274 assert(holder()->is_linked(), "must be linked");
275 VM_ENTRY_MARK;
276 return klassItable::compute_itable_index(get_methodOop());
277 }
278 #endif // SHARK
279
280
281 // ------------------------------------------------------------------
282 // ciMethod::native_entry
283 //
284 // Get the address of this method's native code, if any.
285 address ciMethod::native_entry() {
286 check_is_loaded();
287 assert(flags().is_native(), "must be native method");
288 VM_ENTRY_MARK;
289 methodOop method = get_methodOop();
290 address entry = method->native_function();
291 assert(entry != NULL, "must be valid entry point");
292 return entry;
293 }
294
295
296 // ------------------------------------------------------------------
297 // ciMethod::interpreter_entry
298 //
299 // Get the entry point for running this method in the interpreter.
300 address ciMethod::interpreter_entry() {
301 check_is_loaded();
302 VM_ENTRY_MARK;
303 methodHandle mh(THREAD, get_methodOop());
304 return Interpreter::entry_for_method(mh);
305 }
306
307
308 // ------------------------------------------------------------------
309 // ciMethod::uses_balanced_monitors
310 //
311 // Does this method use monitors in a strict stack-disciplined manner?
312 bool ciMethod::has_balanced_monitors() {
313 check_is_loaded();
314 if (_balanced_monitors) return true;
315
316 // Analyze the method to see if monitors are used properly.
317 VM_ENTRY_MARK;
318 methodHandle method(THREAD, get_methodOop());
319 assert(method->has_monitor_bytecodes(), "should have checked this");
320
321 // Check to see if a previous compilation computed the
322 // monitor-matching analysis.
323 if (method->guaranteed_monitor_matching()) {
324 _balanced_monitors = true;
325 return true;
326 }
327
328 {
329 EXCEPTION_MARK;
330 ResourceMark rm(THREAD);
331 GeneratePairingInfo gpi(method);
332 gpi.compute_map(CATCH);
333 if (!gpi.monitor_safe()) {
334 return false;
335 }
336 method->set_guaranteed_monitor_matching();
337 _balanced_monitors = true;
338 }
339 return true;
340 }
341
342
343 // ------------------------------------------------------------------
344 // ciMethod::get_flow_analysis
345 ciTypeFlow* ciMethod::get_flow_analysis() {
346 #if defined(COMPILER2) || defined(SHARK)
347 if (_flow == NULL) {
348 ciEnv* env = CURRENT_ENV;
349 _flow = new (env->arena()) ciTypeFlow(env, this);
350 _flow->do_flow();
351 }
352 return _flow;
353 #else // COMPILER2 || SHARK
354 ShouldNotReachHere();
355 return NULL;
356 #endif // COMPILER2 || SHARK
357 }
358
359
360 // ------------------------------------------------------------------
361 // ciMethod::get_osr_flow_analysis
362 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
363 #if defined(COMPILER2) || defined(SHARK)
364 // OSR entry points are always place after a call bytecode of some sort
365 assert(osr_bci >= 0, "must supply valid OSR entry point");
366 ciEnv* env = CURRENT_ENV;
367 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
368 flow->do_flow();
369 return flow;
370 #else // COMPILER2 || SHARK
371 ShouldNotReachHere();
372 return NULL;
373 #endif // COMPILER2 || SHARK
374 }
375
376 // ------------------------------------------------------------------
377 // ciMethod::raw_liveness_at_bci
378 //
379 // Which local variables are live at a specific bci?
380 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
381 check_is_loaded();
382 if (_liveness == NULL) {
383 // Create the liveness analyzer.
384 Arena* arena = CURRENT_ENV->arena();
385 _liveness = new (arena) MethodLiveness(arena, this);
386 _liveness->compute_liveness();
387 }
388 return _liveness->get_liveness_at(bci);
389 }
390
391 // ------------------------------------------------------------------
392 // ciMethod::liveness_at_bci
393 //
394 // Which local variables are live at a specific bci? When debugging
395 // will return true for all locals in some cases to improve debug
396 // information.
397 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
398 MethodLivenessResult result = raw_liveness_at_bci(bci);
399 if (CURRENT_ENV->jvmti_can_access_local_variables() || DeoptimizeALot || CompileTheWorld) {
400 // Keep all locals live for the user's edification and amusement.
401 result.at_put_range(0, result.size(), true);
402 }
403 return result;
404 }
405
406 // ciMethod::live_local_oops_at_bci
407 //
408 // find all the live oops in the locals array for a particular bci
409 // Compute what the interpreter believes by using the interpreter
410 // oopmap generator. This is used as a double check during osr to
411 // guard against conservative result from MethodLiveness making us
412 // think a dead oop is live. MethodLiveness is conservative in the
413 // sense that it may consider locals to be live which cannot be live,
414 // like in the case where a local could contain an oop or a primitive
415 // along different paths. In that case the local must be dead when
416 // those paths merge. Since the interpreter's viewpoint is used when
417 // gc'ing an interpreter frame we need to use its viewpoint during
418 // OSR when loading the locals.
419
420 BitMap ciMethod::live_local_oops_at_bci(int bci) {
421 VM_ENTRY_MARK;
422 InterpreterOopMap mask;
423 OopMapCache::compute_one_oop_map(get_methodOop(), bci, &mask);
424 int mask_size = max_locals();
425 BitMap result(mask_size);
426 result.clear();
427 int i;
428 for (i = 0; i < mask_size ; i++ ) {
429 if (mask.is_oop(i)) result.set_bit(i);
430 }
431 return result;
432 }
433
434
435 #ifdef COMPILER1
436 // ------------------------------------------------------------------
437 // ciMethod::bci_block_start
438 //
439 // Marks all bcis where a new basic block starts
440 const BitMap ciMethod::bci_block_start() {
441 check_is_loaded();
442 if (_liveness == NULL) {
443 // Create the liveness analyzer.
444 Arena* arena = CURRENT_ENV->arena();
445 _liveness = new (arena) MethodLiveness(arena, this);
446 _liveness->compute_liveness();
447 }
448
449 return _liveness->get_bci_block_start();
450 }
451 #endif // COMPILER1
452
453
454 // ------------------------------------------------------------------
455 // ciMethod::call_profile_at_bci
456 //
457 // Get the ciCallProfile for the invocation of this method.
458 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
459 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
460 ResourceMark rm;
461 ciCallProfile result;
462 if (method_data() != NULL && method_data()->is_mature()) {
463 ciProfileData* data = method_data()->bci_to_data(bci);
464 if (data != NULL && data->is_CounterData()) {
465 // Every profiled call site has a counter.
466 int count = data->as_CounterData()->count();
467
468 if (!data->is_ReceiverTypeData()) {
469 result._receiver_count[0] = 0; // that's a definite zero
470 } else { // ReceiverTypeData is a subclass of CounterData
471 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
472 // In addition, virtual call sites have receiver type information
473 int receivers_count_total = 0;
474 int morphism = 0;
475 // Precompute morphism for the possible fixup
476 for (uint i = 0; i < call->row_limit(); i++) {
477 ciKlass* receiver = call->receiver(i);
478 if (receiver == NULL) continue;
479 morphism++;
480 }
481 int epsilon = 0;
482 if (TieredCompilation && ProfileInterpreter) {
483 // Interpreter and C1 treat final and special invokes differently.
484 // C1 will record a type, whereas the interpreter will just
485 // increment the count. Detect this case.
486 if (morphism == 1 && count > 0) {
487 epsilon = count;
488 count = 0;
489 }
490 }
491 for (uint i = 0; i < call->row_limit(); i++) {
492 ciKlass* receiver = call->receiver(i);
493 if (receiver == NULL) continue;
494 int rcount = call->receiver_count(i) + epsilon;
495 if (rcount == 0) rcount = 1; // Should be valid value
496 receivers_count_total += rcount;
497 // Add the receiver to result data.
498 result.add_receiver(receiver, rcount);
499 // If we extend profiling to record methods,
500 // we will set result._method also.
501 }
502 // Determine call site's morphism.
503 // The call site count is 0 with known morphism (onlt 1 or 2 receivers)
504 // or < 0 in the case of a type check failured for checkcast, aastore, instanceof.
505 // The call site count is > 0 in the case of a polymorphic virtual call.
506 if (morphism > 0 && morphism == result._limit) {
507 // The morphism <= MorphismLimit.
508 if ((morphism < ciCallProfile::MorphismLimit) ||
509 (morphism == ciCallProfile::MorphismLimit && count == 0)) {
510 #ifdef ASSERT
511 if (count > 0) {
512 this->print_short_name(tty);
513 tty->print_cr(" @ bci:%d", bci);
514 this->print_codes();
515 assert(false, "this call site should not be polymorphic");
516 }
517 #endif
518 result._morphism = morphism;
519 }
520 }
521 // Make the count consistent if this is a call profile. If count is
522 // zero or less, presume that this is a typecheck profile and
523 // do nothing. Otherwise, increase count to be the sum of all
524 // receiver's counts.
525 if (count >= 0) {
526 count += receivers_count_total;
527 }
528 }
529 result._count = count;
530 }
531 }
532 return result;
533 }
534
535 // ------------------------------------------------------------------
536 // Add new receiver and sort data by receiver's profile count.
537 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
538 // Add new receiver and sort data by receiver's counts when we have space
539 // for it otherwise replace the less called receiver (less called receiver
540 // is placed to the last array element which is not used).
541 // First array's element contains most called receiver.
542 int i = _limit;
543 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
544 _receiver[i] = _receiver[i-1];
545 _receiver_count[i] = _receiver_count[i-1];
546 }
547 _receiver[i] = receiver;
548 _receiver_count[i] = receiver_count;
549 if (_limit < MorphismLimit) _limit++;
550 }
551
552 // ------------------------------------------------------------------
553 // ciMethod::find_monomorphic_target
554 //
555 // Given a certain calling environment, find the monomorphic target
556 // for the call. Return NULL if the call is not monomorphic in
557 // its calling environment, or if there are only abstract methods.
558 // The returned method is never abstract.
559 // Note: If caller uses a non-null result, it must inform dependencies
560 // via assert_unique_concrete_method or assert_leaf_type.
561 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
562 ciInstanceKlass* callee_holder,
563 ciInstanceKlass* actual_recv) {
564 check_is_loaded();
565
566 if (actual_recv->is_interface()) {
567 // %%% We cannot trust interface types, yet. See bug 6312651.
568 return NULL;
569 }
570
571 ciMethod* root_m = resolve_invoke(caller, actual_recv);
572 if (root_m == NULL) {
573 // Something went wrong looking up the actual receiver method.
574 return NULL;
575 }
576 assert(!root_m->is_abstract(), "resolve_invoke promise");
577
578 // Make certain quick checks even if UseCHA is false.
579
580 // Is it private or final?
581 if (root_m->can_be_statically_bound()) {
582 return root_m;
583 }
584
585 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
586 // Easy case. There is no other place to put a method, so don't bother
587 // to go through the VM_ENTRY_MARK and all the rest.
588 return root_m;
589 }
590
591 // Array methods (clone, hashCode, etc.) are always statically bound.
592 // If we were to see an array type here, we'd return root_m.
593 // However, this method processes only ciInstanceKlasses. (See 4962591.)
594 // The inline_native_clone intrinsic narrows Object to T[] properly,
595 // so there is no need to do the same job here.
596
597 if (!UseCHA) return NULL;
598
599 VM_ENTRY_MARK;
600
601 methodHandle target;
602 {
603 MutexLocker locker(Compile_lock);
604 klassOop context = actual_recv->get_klassOop();
605 target = Dependencies::find_unique_concrete_method(context,
606 root_m->get_methodOop());
607 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
608 }
609
610 #ifndef PRODUCT
611 if (TraceDependencies && target() != NULL && target() != root_m->get_methodOop()) {
612 tty->print("found a non-root unique target method");
613 tty->print_cr(" context = %s", instanceKlass::cast(actual_recv->get_klassOop())->external_name());
614 tty->print(" method = ");
615 target->print_short_name(tty);
616 tty->cr();
617 }
618 #endif //PRODUCT
619
620 if (target() == NULL) {
621 return NULL;
622 }
623 if (target() == root_m->get_methodOop()) {
624 return root_m;
625 }
626 if (!root_m->is_public() &&
627 !root_m->is_protected()) {
628 // If we are going to reason about inheritance, it's easiest
629 // if the method in question is public, protected, or private.
630 // If the answer is not root_m, it is conservatively correct
631 // to return NULL, even if the CHA encountered irrelevant
632 // methods in other packages.
633 // %%% TO DO: Work out logic for package-private methods
634 // with the same name but different vtable indexes.
635 return NULL;
636 }
637 return CURRENT_THREAD_ENV->get_object(target())->as_method();
638 }
639
640 // ------------------------------------------------------------------
641 // ciMethod::resolve_invoke
642 //
643 // Given a known receiver klass, find the target for the call.
644 // Return NULL if the call has no target or the target is abstract.
645 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver) {
646 check_is_loaded();
647 VM_ENTRY_MARK;
648
649 KlassHandle caller_klass (THREAD, caller->get_klassOop());
650 KlassHandle h_recv (THREAD, exact_receiver->get_klassOop());
651 KlassHandle h_resolved (THREAD, holder()->get_klassOop());
652 symbolHandle h_name (THREAD, name()->get_symbolOop());
653 symbolHandle h_signature (THREAD, signature()->get_symbolOop());
654
655 methodHandle m;
656 // Only do exact lookup if receiver klass has been linked. Otherwise,
657 // the vtable has not been setup, and the LinkResolver will fail.
658 if (h_recv->oop_is_javaArray()
659 ||
660 instanceKlass::cast(h_recv())->is_linked() && !exact_receiver->is_interface()) {
661 if (holder()->is_interface()) {
662 m = LinkResolver::resolve_interface_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass);
663 } else {
664 m = LinkResolver::resolve_virtual_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass);
665 }
666 }
667
668 if (m.is_null()) {
669 // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
670 return NULL;
671 }
672
673 ciMethod* result = this;
674 if (m() != get_methodOop()) {
675 result = CURRENT_THREAD_ENV->get_object(m())->as_method();
676 }
677
678 // Don't return abstract methods because they aren't
679 // optimizable or interesting.
680 if (result->is_abstract()) {
681 return NULL;
682 } else {
683 return result;
684 }
685 }
686
687 // ------------------------------------------------------------------
688 // ciMethod::resolve_vtable_index
689 //
690 // Given a known receiver klass, find the vtable index for the call.
691 // Return methodOopDesc::invalid_vtable_index if the vtable_index is unknown.
692 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
693 check_is_loaded();
694
695 int vtable_index = methodOopDesc::invalid_vtable_index;
696 // Only do lookup if receiver klass has been linked. Otherwise,
697 // the vtable has not been setup, and the LinkResolver will fail.
698 if (!receiver->is_interface()
699 && (!receiver->is_instance_klass() ||
700 receiver->as_instance_klass()->is_linked())) {
701 VM_ENTRY_MARK;
702
703 KlassHandle caller_klass (THREAD, caller->get_klassOop());
704 KlassHandle h_recv (THREAD, receiver->get_klassOop());
705 symbolHandle h_name (THREAD, name()->get_symbolOop());
706 symbolHandle h_signature (THREAD, signature()->get_symbolOop());
707
708 vtable_index = LinkResolver::resolve_virtual_vtable_index(h_recv, h_recv, h_name, h_signature, caller_klass);
709 if (vtable_index == methodOopDesc::nonvirtual_vtable_index) {
710 // A statically bound method. Return "no such index".
711 vtable_index = methodOopDesc::invalid_vtable_index;
712 }
713 }
714
715 return vtable_index;
716 }
717
718 // ------------------------------------------------------------------
719 // ciMethod::interpreter_call_site_count
720 int ciMethod::interpreter_call_site_count(int bci) {
721 if (method_data() != NULL) {
722 ResourceMark rm;
723 ciProfileData* data = method_data()->bci_to_data(bci);
724 if (data != NULL && data->is_CounterData()) {
725 return scale_count(data->as_CounterData()->count());
726 }
727 }
728 return -1; // unknown
729 }
730
731 // ------------------------------------------------------------------
732 // Adjust a CounterData count to be commensurate with
733 // interpreter_invocation_count. If the MDO exists for
734 // only 25% of the time the method exists, then the
735 // counts in the MDO should be scaled by 4X, so that
736 // they can be usefully and stably compared against the
737 // invocation counts in methods.
738 int ciMethod::scale_count(int count, float prof_factor) {
739 if (count > 0 && method_data() != NULL) {
740 int counter_life;
741 int method_life = interpreter_invocation_count();
742 if (TieredCompilation) {
743 // In tiered the MDO's life is measured directly, so just use the snapshotted counters
744 counter_life = MAX2(method_data()->invocation_count(), method_data()->backedge_count());
745 } else {
746 int current_mileage = method_data()->current_mileage();
747 int creation_mileage = method_data()->creation_mileage();
748 counter_life = current_mileage - creation_mileage;
749 }
750
751 // counter_life due to backedge_counter could be > method_life
752 if (counter_life > method_life)
753 counter_life = method_life;
754 if (0 < counter_life && counter_life <= method_life) {
755 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
756 count = (count > 0) ? count : 1;
757 }
758 }
759 return count;
760 }
761
762 // ------------------------------------------------------------------
763 // invokedynamic support
764
765 // ------------------------------------------------------------------
766 // ciMethod::is_method_handle_invoke
767 //
768 // Return true if the method is an instance of one of the two
769 // signature-polymorphic MethodHandle methods, invokeExact or invokeGeneric.
770 bool ciMethod::is_method_handle_invoke() const {
771 if (!is_loaded()) {
772 bool flag = (holder()->name() == ciSymbol::java_dyn_MethodHandle() &&
773 methodOopDesc::is_method_handle_invoke_name(name()->sid()));
774 return flag;
775 }
776 VM_ENTRY_MARK;
777 return get_methodOop()->is_method_handle_invoke();
778 }
779
780 // ------------------------------------------------------------------
781 // ciMethod::is_method_handle_adapter
782 //
783 // Return true if the method is a generated MethodHandle adapter.
784 // These are built by MethodHandleCompiler.
785 bool ciMethod::is_method_handle_adapter() const {
786 if (!is_loaded()) return false;
787 VM_ENTRY_MARK;
788 return get_methodOop()->is_method_handle_adapter();
789 }
790
791 ciInstance* ciMethod::method_handle_type() {
792 check_is_loaded();
793 VM_ENTRY_MARK;
794 oop mtype = get_methodOop()->method_handle_type();
795 return CURRENT_THREAD_ENV->get_object(mtype)->as_instance();
796 }
797
798
799 // ------------------------------------------------------------------
800 // ciMethod::build_method_data
801 //
802 // Generate new methodDataOop objects at compile time.
803 void ciMethod::build_method_data(methodHandle h_m) {
804 EXCEPTION_CONTEXT;
805 if (is_native() || is_abstract() || h_m()->is_accessor()) return;
806 if (h_m()->method_data() == NULL) {
807 methodOopDesc::build_interpreter_method_data(h_m, THREAD);
808 if (HAS_PENDING_EXCEPTION) {
809 CLEAR_PENDING_EXCEPTION;
810 }
811 }
812 if (h_m()->method_data() != NULL) {
813 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data();
814 _method_data->load_data();
815 } else {
816 _method_data = CURRENT_ENV->get_empty_methodData();
817 }
818 }
819
820 // public, retroactive version
821 void ciMethod::build_method_data() {
822 if (_method_data == NULL || _method_data->is_empty()) {
823 GUARDED_VM_ENTRY({
824 build_method_data(get_methodOop());
825 });
826 }
827 }
828
829
830 // ------------------------------------------------------------------
831 // ciMethod::method_data
832 //
833 ciMethodData* ciMethod::method_data() {
834 if (_method_data != NULL) {
835 return _method_data;
836 }
837 VM_ENTRY_MARK;
838 ciEnv* env = CURRENT_ENV;
839 Thread* my_thread = JavaThread::current();
840 methodHandle h_m(my_thread, get_methodOop());
841
842 // Create an MDO for the inlinee
843 if (TieredCompilation && is_c1_compile(env->comp_level())) {
844 build_method_data(h_m);
845 }
846
847 if (h_m()->method_data() != NULL) {
848 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data();
849 _method_data->load_data();
850 } else {
851 _method_data = CURRENT_ENV->get_empty_methodData();
852 }
853 return _method_data;
854
855 }
856
857
858 // ------------------------------------------------------------------
859 // ciMethod::will_link
860 //
861 // Will this method link in a specific calling context?
862 bool ciMethod::will_link(ciKlass* accessing_klass,
863 ciKlass* declared_method_holder,
864 Bytecodes::Code bc) {
865 if (!is_loaded()) {
866 // Method lookup failed.
867 return false;
868 }
869
870 // The link checks have been front-loaded into the get_method
871 // call. This method (ciMethod::will_link()) will be removed
872 // in the future.
873
874 return true;
875 }
876
877 // ------------------------------------------------------------------
878 // ciMethod::should_exclude
879 //
880 // Should this method be excluded from compilation?
881 bool ciMethod::should_exclude() {
882 check_is_loaded();
883 VM_ENTRY_MARK;
884 methodHandle mh(THREAD, get_methodOop());
885 bool ignore;
886 return CompilerOracle::should_exclude(mh, ignore);
887 }
888
889 // ------------------------------------------------------------------
890 // ciMethod::should_inline
891 //
892 // Should this method be inlined during compilation?
893 bool ciMethod::should_inline() {
894 check_is_loaded();
895 VM_ENTRY_MARK;
896 methodHandle mh(THREAD, get_methodOop());
897 return CompilerOracle::should_inline(mh);
898 }
899
900 // ------------------------------------------------------------------
901 // ciMethod::should_not_inline
902 //
903 // Should this method be disallowed from inlining during compilation?
904 bool ciMethod::should_not_inline() {
905 check_is_loaded();
906 VM_ENTRY_MARK;
907 methodHandle mh(THREAD, get_methodOop());
908 return CompilerOracle::should_not_inline(mh);
909 }
910
911 // ------------------------------------------------------------------
912 // ciMethod::should_print_assembly
913 //
914 // Should the compiler print the generated code for this method?
915 bool ciMethod::should_print_assembly() {
916 check_is_loaded();
917 VM_ENTRY_MARK;
918 methodHandle mh(THREAD, get_methodOop());
919 return CompilerOracle::should_print(mh);
920 }
921
922 // ------------------------------------------------------------------
923 // ciMethod::break_at_execute
924 //
925 // Should the compiler insert a breakpoint into the generated code
926 // method?
927 bool ciMethod::break_at_execute() {
928 check_is_loaded();
929 VM_ENTRY_MARK;
930 methodHandle mh(THREAD, get_methodOop());
931 return CompilerOracle::should_break_at(mh);
932 }
933
934 // ------------------------------------------------------------------
935 // ciMethod::has_option
936 //
937 bool ciMethod::has_option(const char* option) {
938 check_is_loaded();
939 VM_ENTRY_MARK;
940 methodHandle mh(THREAD, get_methodOop());
941 return CompilerOracle::has_option_string(mh, option);
942 }
943
944 // ------------------------------------------------------------------
945 // ciMethod::can_be_compiled
946 //
947 // Have previous compilations of this method succeeded?
948 bool ciMethod::can_be_compiled() {
949 check_is_loaded();
950 ciEnv* env = CURRENT_ENV;
951 if (is_c1_compile(env->comp_level())) {
952 return _is_c1_compilable;
953 }
954 return _is_c2_compilable;
955 }
956
957 // ------------------------------------------------------------------
958 // ciMethod::set_not_compilable
959 //
960 // Tell the VM that this method cannot be compiled at all.
961 void ciMethod::set_not_compilable() {
962 check_is_loaded();
963 VM_ENTRY_MARK;
964 ciEnv* env = CURRENT_ENV;
965 if (is_c1_compile(env->comp_level())) {
966 _is_c1_compilable = false;
967 } else {
968 _is_c2_compilable = false;
969 }
970 get_methodOop()->set_not_compilable(env->comp_level());
971 }
972
973 // ------------------------------------------------------------------
974 // ciMethod::can_be_osr_compiled
975 //
976 // Have previous compilations of this method succeeded?
977 //
978 // Implementation note: the VM does not currently keep track
979 // of failed OSR compilations per bci. The entry_bci parameter
980 // is currently unused.
981 bool ciMethod::can_be_osr_compiled(int entry_bci) {
982 check_is_loaded();
983 VM_ENTRY_MARK;
984 ciEnv* env = CURRENT_ENV;
985 return !get_methodOop()->is_not_osr_compilable(env->comp_level());
986 }
987
988 // ------------------------------------------------------------------
989 // ciMethod::has_compiled_code
990 bool ciMethod::has_compiled_code() {
991 VM_ENTRY_MARK;
992 return get_methodOop()->code() != NULL;
993 }
994
995 int ciMethod::comp_level() {
996 check_is_loaded();
997 VM_ENTRY_MARK;
998 nmethod* nm = get_methodOop()->code();
999 if (nm != NULL) return nm->comp_level();
1000 return 0;
1001 }
1002
1003 // ------------------------------------------------------------------
1004 // ciMethod::instructions_size
1005 //
1006 // This is a rough metric for "fat" methods, compared before inlining
1007 // with InlineSmallCode. The CodeBlob::code_size accessor includes
1008 // junk like exception handler, stubs, and constant table, which are
1009 // not highly relevant to an inlined method. So we use the more
1010 // specific accessor nmethod::insts_size.
1011 int ciMethod::instructions_size(int comp_level) {
1012 GUARDED_VM_ENTRY(
1013 nmethod* code = get_methodOop()->code();
1014 if (code != NULL && (comp_level == CompLevel_any || comp_level == code->comp_level())) {
1015 return code->insts_end() - code->verified_entry_point();
1016 }
1017 return 0;
1018 )
1019 }
1020
1021 // ------------------------------------------------------------------
1022 // ciMethod::log_nmethod_identity
1023 void ciMethod::log_nmethod_identity(xmlStream* log) {
1024 GUARDED_VM_ENTRY(
1025 nmethod* code = get_methodOop()->code();
1026 if (code != NULL) {
1027 code->log_identity(log);
1028 }
1029 )
1030 }
1031
1032 // ------------------------------------------------------------------
1033 // ciMethod::is_not_reached
1034 bool ciMethod::is_not_reached(int bci) {
1035 check_is_loaded();
1036 VM_ENTRY_MARK;
1037 return Interpreter::is_not_reached(
1038 methodHandle(THREAD, get_methodOop()), bci);
1039 }
1040
1041 // ------------------------------------------------------------------
1042 // ciMethod::was_never_executed
1043 bool ciMethod::was_executed_more_than(int times) {
1044 VM_ENTRY_MARK;
1045 return get_methodOop()->was_executed_more_than(times);
1046 }
1047
1048 // ------------------------------------------------------------------
1049 // ciMethod::has_unloaded_classes_in_signature
1050 bool ciMethod::has_unloaded_classes_in_signature() {
1051 VM_ENTRY_MARK;
1052 {
1053 EXCEPTION_MARK;
1054 methodHandle m(THREAD, get_methodOop());
1055 bool has_unloaded = methodOopDesc::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);
1056 if( HAS_PENDING_EXCEPTION ) {
1057 CLEAR_PENDING_EXCEPTION;
1058 return true; // Declare that we may have unloaded classes
1059 }
1060 return has_unloaded;
1061 }
1062 }
1063
1064 // ------------------------------------------------------------------
1065 // ciMethod::is_klass_loaded
1066 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1067 VM_ENTRY_MARK;
1068 return get_methodOop()->is_klass_loaded(refinfo_index, must_be_resolved);
1069 }
1070
1071 // ------------------------------------------------------------------
1072 // ciMethod::check_call
1073 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1074 VM_ENTRY_MARK;
1075 {
1076 EXCEPTION_MARK;
1077 HandleMark hm(THREAD);
1078 constantPoolHandle pool (THREAD, get_methodOop()->constants());
1079 methodHandle spec_method;
1080 KlassHandle spec_klass;
1081 LinkResolver::resolve_method(spec_method, spec_klass, pool, refinfo_index, THREAD);
1082 if (HAS_PENDING_EXCEPTION) {
1083 CLEAR_PENDING_EXCEPTION;
1084 return false;
1085 } else {
1086 return (spec_method->is_static() == is_static);
1087 }
1088 }
1089 return false;
1090 }
1091
1092 // ------------------------------------------------------------------
1093 // ciMethod::print_codes
1094 //
1095 // Print the bytecodes for this method.
1096 void ciMethod::print_codes_on(outputStream* st) {
1097 check_is_loaded();
1098 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(st);)
1099 }
1100
1101
1102 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1103 check_is_loaded(); \
1104 VM_ENTRY_MARK; \
1105 return get_methodOop()->flag_accessor(); \
1106 }
1107
1108 bool ciMethod::is_empty_method() const { FETCH_FLAG_FROM_VM(is_empty_method); }
1109 bool ciMethod::is_vanilla_constructor() const { FETCH_FLAG_FROM_VM(is_vanilla_constructor); }
1110 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); }
1111 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); }
1112 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); }
1113 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); }
1114
1115 BCEscapeAnalyzer *ciMethod::get_bcea() {
1116 #ifdef COMPILER2
1117 if (_bcea == NULL) {
1118 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1119 }
1120 return _bcea;
1121 #else // COMPILER2
1122 ShouldNotReachHere();
1123 return NULL;
1124 #endif // COMPILER2
1125 }
1126
1127 ciMethodBlocks *ciMethod::get_method_blocks() {
1128 Arena *arena = CURRENT_ENV->arena();
1129 if (_method_blocks == NULL) {
1130 _method_blocks = new (arena) ciMethodBlocks(arena, this);
1131 }
1132 return _method_blocks;
1133 }
1134
1135 #undef FETCH_FLAG_FROM_VM
1136
1137
1138 // ------------------------------------------------------------------
1139 // ciMethod::print_codes
1140 //
1141 // Print a range of the bytecodes for this method.
1142 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1143 check_is_loaded();
1144 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(from, to, st);)
1145 }
1146
1147 // ------------------------------------------------------------------
1148 // ciMethod::print_name
1149 //
1150 // Print the name of this method, including signature and some flags.
1151 void ciMethod::print_name(outputStream* st) {
1152 check_is_loaded();
1153 GUARDED_VM_ENTRY(get_methodOop()->print_name(st);)
1154 }
1155
1156 // ------------------------------------------------------------------
1157 // ciMethod::print_short_name
1158 //
1159 // Print the name of this method, without signature.
1160 void ciMethod::print_short_name(outputStream* st) {
1161 check_is_loaded();
1162 GUARDED_VM_ENTRY(get_methodOop()->print_short_name(st);)
1163 }
1164
1165 // ------------------------------------------------------------------
1166 // ciMethod::print_impl
1167 //
1168 // Implementation of the print method.
1169 void ciMethod::print_impl(outputStream* st) {
1170 ciObject::print_impl(st);
1171 st->print(" name=");
1172 name()->print_symbol_on(st);
1173 st->print(" holder=");
1174 holder()->print_name_on(st);
1175 st->print(" signature=");
1176 signature()->as_symbol()->print_symbol_on(st);
1177 if (is_loaded()) {
1178 st->print(" loaded=true flags=");
1179 flags().print_member_flags(st);
1180 } else {
1181 st->print(" loaded=false");
1182 }
1183 }