1 /*
2 * Copyright (c) 1998, 2016, 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/ciCallSite.hpp"
27 #include "ci/ciMethodHandle.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "compiler/compileLog.hpp"
31 #include "interpreter/linkResolver.hpp"
32 #include "opto/addnode.hpp"
33 #include "opto/callGenerator.hpp"
34 #include "opto/castnode.hpp"
35 #include "opto/cfgnode.hpp"
36 #include "opto/mulnode.hpp"
37 #include "opto/parse.hpp"
38 #include "opto/rootnode.hpp"
39 #include "opto/runtime.hpp"
40 #include "opto/subnode.hpp"
41 #include "opto/valuetypenode.hpp"
42 #include "prims/nativeLookup.hpp"
43 #include "runtime/sharedRuntime.hpp"
44
45 void trace_type_profile(Compile* C, ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) {
46 if (TraceTypeProfile || C->print_inlining()) {
47 outputStream* out = tty;
48 if (!C->print_inlining()) {
49 if (!PrintOpto && !PrintCompilation) {
50 method->print_short_name();
51 tty->cr();
52 }
53 CompileTask::print_inlining_tty(prof_method, depth, bci);
54 } else {
55 out = C->print_inlining_stream();
56 }
57 CompileTask::print_inline_indent(depth, out);
58 out->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count);
59 stringStream ss;
60 prof_klass->name()->print_symbol_on(&ss);
61 out->print("%s", ss.as_string());
62 out->cr();
63 }
64 }
65
66 CallGenerator* Compile::call_generator(ciMethod* callee, int vtable_index, bool call_does_dispatch,
67 JVMState* jvms, bool allow_inline,
68 float prof_factor, ciKlass* speculative_receiver_type,
69 bool allow_intrinsics, bool delayed_forbidden) {
70 ciMethod* caller = jvms->method();
71 int bci = jvms->bci();
72 Bytecodes::Code bytecode = caller->java_code_at_bci(bci);
73 guarantee(callee != NULL, "failed method resolution");
74
75 // Dtrace currently doesn't work unless all calls are vanilla
76 if (env()->dtrace_method_probes()) {
77 allow_inline = false;
78 }
79
80 // Note: When we get profiling during stage-1 compiles, we want to pull
81 // from more specific profile data which pertains to this inlining.
82 // Right now, ignore the information in jvms->caller(), and do method[bci].
83 ciCallProfile profile = caller->call_profile_at_bci(bci);
84
85 // See how many times this site has been invoked.
86 int site_count = profile.count();
87 int receiver_count = -1;
88 if (call_does_dispatch && UseTypeProfile && profile.has_receiver(0)) {
89 // Receivers in the profile structure are ordered by call counts
90 // so that the most called (major) receiver is profile.receiver(0).
91 receiver_count = profile.receiver_count(0);
92 }
93
94 CompileLog* log = this->log();
95 if (log != NULL) {
96 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
97 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1;
98 log->begin_elem("call method='%d' count='%d' prof_factor='%f'",
99 log->identify(callee), site_count, prof_factor);
100 if (call_does_dispatch) log->print(" virtual='1'");
101 if (allow_inline) log->print(" inline='1'");
102 if (receiver_count >= 0) {
103 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
104 if (profile.has_receiver(1)) {
105 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
106 }
107 }
108 if (callee->is_method_handle_intrinsic()) {
109 log->print(" method_handle_intrinsic='1'");
110 }
111 log->end_elem();
112 }
113
114 // Special case the handling of certain common, profitable library
115 // methods. If these methods are replaced with specialized code,
116 // then we return it as the inlined version of the call.
117 // We do this before the strict f.p. check below because the
118 // intrinsics handle strict f.p. correctly.
119 CallGenerator* cg_intrinsic = NULL;
120 if (allow_inline && allow_intrinsics) {
121 CallGenerator* cg = find_intrinsic(callee, call_does_dispatch);
122 if (cg != NULL) {
123 if (cg->is_predicated()) {
124 // Code without intrinsic but, hopefully, inlined.
125 CallGenerator* inline_cg = this->call_generator(callee,
126 vtable_index, call_does_dispatch, jvms, allow_inline, prof_factor, speculative_receiver_type, false);
127 if (inline_cg != NULL) {
128 cg = CallGenerator::for_predicated_intrinsic(cg, inline_cg);
129 }
130 }
131
132 // If intrinsic does the virtual dispatch, we try to use the type profile
133 // first, and hopefully inline it as the regular virtual call below.
134 // We will retry the intrinsic if nothing had claimed it afterwards.
135 if (cg->does_virtual_dispatch()) {
136 cg_intrinsic = cg;
137 cg = NULL;
138 } else {
139 return cg;
140 }
141 }
142 }
143
144 // Do method handle calls.
145 // NOTE: This must happen before normal inlining logic below since
146 // MethodHandle.invoke* are native methods which obviously don't
147 // have bytecodes and so normal inlining fails.
148 if (callee->is_method_handle_intrinsic()) {
149 CallGenerator* cg = CallGenerator::for_method_handle_call(jvms, caller, callee, delayed_forbidden);
150 assert(cg == NULL || !delayed_forbidden || !cg->is_late_inline() || cg->is_mh_late_inline(), "unexpected CallGenerator");
151 return cg;
152 }
153
154 // Do not inline strict fp into non-strict code, or the reverse
155 if (caller->is_strict() ^ callee->is_strict()) {
156 allow_inline = false;
157 }
158
159 // Attempt to inline...
160 if (allow_inline) {
161 // The profile data is only partly attributable to this caller,
162 // scale back the call site information.
163 float past_uses = jvms->method()->scale_count(site_count, prof_factor);
164 // This is the number of times we expect the call code to be used.
165 float expected_uses = past_uses;
166
167 // Try inlining a bytecoded method:
168 if (!call_does_dispatch) {
169 InlineTree* ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
170 WarmCallInfo scratch_ci;
171 bool should_delay = false;
172 WarmCallInfo* ci = ilt->ok_to_inline(callee, jvms, profile, &scratch_ci, should_delay);
173 assert(ci != &scratch_ci, "do not let this pointer escape");
174 bool allow_inline = (ci != NULL && !ci->is_cold());
175 bool require_inline = (allow_inline && ci->is_hot());
176
177 if (allow_inline) {
178 CallGenerator* cg = CallGenerator::for_inline(callee, expected_uses);
179
180 if (require_inline && cg != NULL) {
181 // Delay the inlining of this method to give us the
182 // opportunity to perform some high level optimizations
183 // first.
184 if (should_delay_string_inlining(callee, jvms)) {
185 assert(!delayed_forbidden, "strange");
186 return CallGenerator::for_string_late_inline(callee, cg);
187 } else if (should_delay_boxing_inlining(callee, jvms)) {
188 assert(!delayed_forbidden, "strange");
189 return CallGenerator::for_boxing_late_inline(callee, cg);
190 } else if ((should_delay || AlwaysIncrementalInline) && !delayed_forbidden) {
191 return CallGenerator::for_late_inline(callee, cg);
192 }
193 }
194 if (cg == NULL || should_delay) {
195 // Fall through.
196 } else if (require_inline || !InlineWarmCalls) {
197 return cg;
198 } else {
199 CallGenerator* cold_cg = call_generator(callee, vtable_index, call_does_dispatch, jvms, false, prof_factor);
200 return CallGenerator::for_warm_call(ci, cold_cg, cg);
201 }
202 }
203 }
204
205 // Try using the type profile.
206 if (call_does_dispatch && site_count > 0 && receiver_count > 0) {
207 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
208 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
209 ciMethod* receiver_method = NULL;
210
211 int morphism = profile.morphism();
212 if (speculative_receiver_type != NULL) {
213 if (!too_many_traps(caller, bci, Deoptimization::Reason_speculate_class_check)) {
214 // We have a speculative type, we should be able to resolve
215 // the call. We do that before looking at the profiling at
216 // this invoke because it may lead to bimorphic inlining which
217 // a speculative type should help us avoid.
218 receiver_method = callee->resolve_invoke(jvms->method()->holder(),
219 speculative_receiver_type);
220 if (receiver_method == NULL) {
221 speculative_receiver_type = NULL;
222 } else {
223 morphism = 1;
224 }
225 } else {
226 // speculation failed before. Use profiling at the call
227 // (could allow bimorphic inlining for instance).
228 speculative_receiver_type = NULL;
229 }
230 }
231 if (receiver_method == NULL &&
232 (have_major_receiver || morphism == 1 ||
233 (morphism == 2 && UseBimorphicInlining))) {
234 // receiver_method = profile.method();
235 // Profiles do not suggest methods now. Look it up in the major receiver.
236 receiver_method = callee->resolve_invoke(jvms->method()->holder(),
237 profile.receiver(0));
238 }
239 if (receiver_method != NULL) {
240 // The single majority receiver sufficiently outweighs the minority.
241 CallGenerator* hit_cg = this->call_generator(receiver_method,
242 vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
243 if (hit_cg != NULL) {
244 // Look up second receiver.
245 CallGenerator* next_hit_cg = NULL;
246 ciMethod* next_receiver_method = NULL;
247 if (morphism == 2 && UseBimorphicInlining) {
248 next_receiver_method = callee->resolve_invoke(jvms->method()->holder(),
249 profile.receiver(1));
250 if (next_receiver_method != NULL) {
251 next_hit_cg = this->call_generator(next_receiver_method,
252 vtable_index, !call_does_dispatch, jvms,
253 allow_inline, prof_factor);
254 if (next_hit_cg != NULL && !next_hit_cg->is_inline() &&
255 have_major_receiver && UseOnlyInlinedBimorphic) {
256 // Skip if we can't inline second receiver's method
257 next_hit_cg = NULL;
258 }
259 }
260 }
261 CallGenerator* miss_cg;
262 Deoptimization::DeoptReason reason = morphism == 2 ?
263 Deoptimization::Reason_bimorphic : Deoptimization::reason_class_check(speculative_receiver_type != NULL);
264 if ((morphism == 1 || (morphism == 2 && next_hit_cg != NULL)) &&
265 !too_many_traps(caller, bci, reason)
266 ) {
267 // Generate uncommon trap for class check failure path
268 // in case of monomorphic or bimorphic virtual call site.
269 miss_cg = CallGenerator::for_uncommon_trap(callee, reason,
270 Deoptimization::Action_maybe_recompile);
271 } else {
272 // Generate virtual call for class check failure path
273 // in case of polymorphic virtual call site.
274 miss_cg = CallGenerator::for_virtual_call(callee, vtable_index);
275 }
276 if (miss_cg != NULL) {
277 if (next_hit_cg != NULL) {
278 assert(speculative_receiver_type == NULL, "shouldn't end up here if we used speculation");
279 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1));
280 // We don't need to record dependency on a receiver here and below.
281 // Whenever we inline, the dependency is added by Parse::Parse().
282 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
283 }
284 if (miss_cg != NULL) {
285 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count);
286 ciKlass* k = speculative_receiver_type != NULL ? speculative_receiver_type : profile.receiver(0);
287 float hit_prob = speculative_receiver_type != NULL ? 1.0 : profile.receiver_prob(0);
288 CallGenerator* cg = CallGenerator::for_predicted_call(k, miss_cg, hit_cg, hit_prob);
289 if (cg != NULL) return cg;
290 }
291 }
292 }
293 }
294 }
295 }
296
297 // Nothing claimed the intrinsic, we go with straight-forward inlining
298 // for already discovered intrinsic.
299 if (allow_inline && allow_intrinsics && cg_intrinsic != NULL) {
300 assert(cg_intrinsic->does_virtual_dispatch(), "sanity");
301 return cg_intrinsic;
302 }
303
304 // There was no special inlining tactic, or it bailed out.
305 // Use a more generic tactic, like a simple call.
306 if (call_does_dispatch) {
307 const char* msg = "virtual call";
308 if (PrintInlining) print_inlining(callee, jvms->depth() - 1, jvms->bci(), msg);
309 C->log_inline_failure(msg);
310 return CallGenerator::for_virtual_call(callee, vtable_index);
311 } else {
312 // Class Hierarchy Analysis or Type Profile reveals a unique target,
313 // or it is a static or special call.
314 return CallGenerator::for_direct_call(callee, should_delay_inlining(callee, jvms));
315 }
316 }
317
318 // Return true for methods that shouldn't be inlined early so that
319 // they are easier to analyze and optimize as intrinsics.
320 bool Compile::should_delay_string_inlining(ciMethod* call_method, JVMState* jvms) {
321 if (has_stringbuilder()) {
322
323 if ((call_method->holder() == C->env()->StringBuilder_klass() ||
324 call_method->holder() == C->env()->StringBuffer_klass()) &&
325 (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
326 jvms->method()->holder() == C->env()->StringBuffer_klass())) {
327 // Delay SB calls only when called from non-SB code
328 return false;
329 }
330
331 switch (call_method->intrinsic_id()) {
332 case vmIntrinsics::_StringBuilder_void:
333 case vmIntrinsics::_StringBuilder_int:
334 case vmIntrinsics::_StringBuilder_String:
335 case vmIntrinsics::_StringBuilder_append_char:
336 case vmIntrinsics::_StringBuilder_append_int:
337 case vmIntrinsics::_StringBuilder_append_String:
338 case vmIntrinsics::_StringBuilder_toString:
339 case vmIntrinsics::_StringBuffer_void:
340 case vmIntrinsics::_StringBuffer_int:
341 case vmIntrinsics::_StringBuffer_String:
342 case vmIntrinsics::_StringBuffer_append_char:
343 case vmIntrinsics::_StringBuffer_append_int:
344 case vmIntrinsics::_StringBuffer_append_String:
345 case vmIntrinsics::_StringBuffer_toString:
346 case vmIntrinsics::_Integer_toString:
347 return true;
348
349 case vmIntrinsics::_String_String:
350 {
351 Node* receiver = jvms->map()->in(jvms->argoff() + 1);
352 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
353 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
354 ciMethod* m = csj->method();
355 if (m != NULL &&
356 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
357 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
358 // Delay String.<init>(new SB())
359 return true;
360 }
361 return false;
362 }
363
364 default:
365 return false;
366 }
367 }
368 return false;
369 }
370
371 bool Compile::should_delay_boxing_inlining(ciMethod* call_method, JVMState* jvms) {
372 if (eliminate_boxing() && call_method->is_boxing_method()) {
373 set_has_boxed_value(true);
374 return aggressive_unboxing();
375 }
376 return false;
377 }
378
379 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
380 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
381 // Additional inputs to consider...
382 // bc = bc()
383 // caller = method()
384 // iter().get_method_holder_index()
385 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
386 // Interface classes can be loaded & linked and never get around to
387 // being initialized. Uncommon-trap for not-initialized static or
388 // v-calls. Let interface calls happen.
389 ciInstanceKlass* holder_klass = dest_method->holder();
390 if (!holder_klass->is_being_initialized() &&
391 !holder_klass->is_initialized() &&
392 !holder_klass->is_interface()) {
393 uncommon_trap(Deoptimization::Reason_uninitialized,
394 Deoptimization::Action_reinterpret,
395 holder_klass);
396 return true;
397 }
398
399 assert(dest_method->is_loaded(), "dest_method: typeflow responsibility");
400 return false;
401 }
402
403 #ifdef ASSERT
404 static bool check_call_consistency(JVMState* jvms, CallGenerator* cg) {
405 ciMethod* symbolic_info = jvms->method()->get_method_at_bci(jvms->bci());
406 ciMethod* resolved_method = cg->method();
407 if (!ciMethod::is_consistent_info(symbolic_info, resolved_method)) {
408 tty->print_cr("JVMS:");
409 jvms->dump();
410 tty->print_cr("Bytecode info:");
411 jvms->method()->get_method_at_bci(jvms->bci())->print(); tty->cr();
412 tty->print_cr("Resolved method:");
413 cg->method()->print(); tty->cr();
414 return false;
415 }
416 return true;
417 }
418 #endif // ASSERT
419
420 //------------------------------do_call----------------------------------------
421 // Handle your basic call. Inline if we can & want to, else just setup call.
422 void Parse::do_call() {
423 // It's likely we are going to add debug info soon.
424 // Also, if we inline a guy who eventually needs debug info for this JVMS,
425 // our contribution to it is cleaned up right here.
426 kill_dead_locals();
427
428 C->print_inlining_assert_ready();
429
430 // Set frequently used booleans
431 const bool is_virtual = bc() == Bytecodes::_invokevirtual;
432 const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
433 const bool has_receiver = Bytecodes::has_receiver(bc());
434
435 // Find target being called
436 bool will_link;
437 ciSignature* declared_signature = NULL;
438 ciMethod* orig_callee = iter().get_method(will_link, &declared_signature); // callee in the bytecode
439 ciInstanceKlass* holder_klass = orig_callee->holder();
440 ciKlass* holder = iter().get_declared_method_holder();
441 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
442 assert(declared_signature != NULL, "cannot be null");
443
444 // Bump max node limit for JSR292 users
445 if (bc() == Bytecodes::_invokedynamic || orig_callee->is_method_handle_intrinsic()) {
446 C->set_max_node_limit(3*MaxNodeLimit);
447 }
448
449 // uncommon-trap when callee is unloaded, uninitialized or will not link
450 // bailout when too many arguments for register representation
451 if (!will_link || can_not_compile_call_site(orig_callee, klass)) {
452 if (PrintOpto && (Verbose || WizardMode)) {
453 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
454 orig_callee->print_name(); tty->cr();
455 }
456 return;
457 }
458 assert(holder_klass->is_loaded(), "");
459 //assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); // XXX invokehandle (cur_bc_raw)
460 // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
461 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
462 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
463 // Note: In the absence of miranda methods, an abstract class K can perform
464 // an invokevirtual directly on an interface method I.m if K implements I.
465
466 // orig_callee is the resolved callee which's signature includes the
467 // appendix argument.
468 const int nargs = orig_callee->arg_size();
469 const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id());
470
471 // Push appendix argument (MethodType, CallSite, etc.), if one.
472 if (iter().has_appendix()) {
473 ciObject* appendix_arg = iter().get_appendix();
474 const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg);
475 Node* appendix_arg_node = _gvn.makecon(appendix_arg_type);
476 push(appendix_arg_node);
477 }
478
479 // ---------------------
480 // Does Class Hierarchy Analysis reveal only a single target of a v-call?
481 // Then we may inline or make a static call, but become dependent on there being only 1 target.
482 // Does the call-site type profile reveal only one receiver?
483 // Then we may introduce a run-time check and inline on the path where it succeeds.
484 // The other path may uncommon_trap, check for another receiver, or do a v-call.
485
486 // Try to get the most accurate receiver type
487 ciMethod* callee = orig_callee;
488 int vtable_index = Method::invalid_vtable_index;
489 bool call_does_dispatch = false;
490
491 // Speculative type of the receiver if any
492 ciKlass* speculative_receiver_type = NULL;
493 if (is_virtual_or_interface) {
494 Node* receiver_node = stack(sp() - nargs);
495 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
496 // call_does_dispatch and vtable_index are out-parameters. They might be changed.
497 // For arrays, klass below is Object. When vtable calls are used,
498 // resolving the call with Object would allow an illegal call to
499 // finalize() on an array. We use holder instead: illegal calls to
500 // finalize() won't be compiled as vtable calls (IC call
501 // resolution will catch the illegal call) and the few legal calls
502 // on array types won't be either.
503 callee = C->optimize_virtual_call(method(), bci(), klass, holder, orig_callee,
504 receiver_type, is_virtual,
505 call_does_dispatch, vtable_index); // out-parameters
506 speculative_receiver_type = receiver_type != NULL ? receiver_type->speculative_type() : NULL;
507 }
508
509 // invoke-super-special
510 if (iter().cur_bc_raw() == Bytecodes::_invokespecial && !orig_callee->is_object_initializer()) {
511 ciInstanceKlass* calling_klass = method()->holder();
512 ciInstanceKlass* sender_klass =
513 calling_klass->is_anonymous() ? calling_klass->host_klass() :
514 calling_klass;
515 if (sender_klass->is_interface()) {
516 Node* receiver_node = stack(sp() - nargs);
517 Node* cls_node = makecon(TypeKlassPtr::make(sender_klass));
518 Node* bad_type_ctrl = NULL;
519 Node* casted_receiver = gen_checkcast(receiver_node, cls_node, &bad_type_ctrl);
520 if (bad_type_ctrl != NULL) {
521 PreserveJVMState pjvms(this);
522 set_control(bad_type_ctrl);
523 uncommon_trap(Deoptimization::Reason_class_check,
524 Deoptimization::Action_none);
525 }
526 if (stopped()) {
527 return; // MUST uncommon-trap?
528 }
529 set_stack(sp() - nargs, casted_receiver);
530 }
531 }
532
533 // Note: It's OK to try to inline a virtual call.
534 // The call generator will not attempt to inline a polymorphic call
535 // unless it knows how to optimize the receiver dispatch.
536 bool try_inline = (C->do_inlining() || InlineAccessors);
537
538 // ---------------------
539 dec_sp(nargs); // Temporarily pop args for JVM state of call
540 JVMState* jvms = sync_jvms();
541
542 // ---------------------
543 // Decide call tactic.
544 // This call checks with CHA, the interpreter profile, intrinsics table, etc.
545 // It decides whether inlining is desirable or not.
546 CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type);
547
548 // NOTE: Don't use orig_callee and callee after this point! Use cg->method() instead.
549 orig_callee = callee = NULL;
550
551 // ---------------------
552 // Round double arguments before call
553 round_double_arguments(cg->method());
554
555 // Feed profiling data for arguments to the type system so it can
556 // propagate it as speculative types
557 record_profiled_arguments_for_speculation(cg->method(), bc());
558
559 #ifndef PRODUCT
560 // bump global counters for calls
561 count_compiled_calls(/*at_method_entry*/ false, cg->is_inline());
562
563 // Record first part of parsing work for this call
564 parse_histogram()->record_change();
565 #endif // not PRODUCT
566
567 assert(jvms == this->jvms(), "still operating on the right JVMS");
568 assert(jvms_in_sync(), "jvms must carry full info into CG");
569
570 // save across call, for a subsequent cast_not_null.
571 Node* receiver = has_receiver ? argument(0) : NULL;
572
573 // The extra CheckCastPPs for speculative types mess with PhaseStringOpts
574 if (receiver != NULL && !call_does_dispatch && !cg->is_string_late_inline()) {
575 // Feed profiling data for a single receiver to the type system so
576 // it can propagate it as a speculative type
577 receiver = record_profiled_receiver_for_speculation(receiver);
578 }
579
580 // Bump method data counters (We profile *before* the call is made
581 // because exceptions don't return to the call site.)
582 profile_call(receiver);
583
584 JVMState* new_jvms = cg->generate(jvms);
585 if (new_jvms == NULL) {
586 // When inlining attempt fails (e.g., too many arguments),
587 // it may contaminate the current compile state, making it
588 // impossible to pull back and try again. Once we call
589 // cg->generate(), we are committed. If it fails, the whole
590 // compilation task is compromised.
591 if (failing()) return;
592
593 // This can happen if a library intrinsic is available, but refuses
594 // the call site, perhaps because it did not match a pattern the
595 // intrinsic was expecting to optimize. Should always be possible to
596 // get a normal java call that may inline in that case
597 cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type, /* allow_intrinsics= */ false);
598 new_jvms = cg->generate(jvms);
599 if (new_jvms == NULL) {
600 guarantee(failing(), "call failed to generate: calls should work");
601 return;
602 }
603 }
604
605 if (cg->is_inline()) {
606 // Accumulate has_loops estimate
607 C->set_has_loops(C->has_loops() || cg->method()->has_loops());
608 C->env()->notice_inlined_method(cg->method());
609 }
610
611 // Reset parser state from [new_]jvms, which now carries results of the call.
612 // Return value (if any) is already pushed on the stack by the cg.
613 add_exception_states_from(new_jvms);
614 if (new_jvms->map()->control() == top()) {
615 stop_and_kill_map();
616 } else {
617 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
618 set_jvms(new_jvms);
619 }
620
621 assert(check_call_consistency(jvms, cg), "inconsistent info");
622
623 if (!stopped()) {
624 // This was some sort of virtual call, which did a null check for us.
625 // Now we can assert receiver-not-null, on the normal return path.
626 if (receiver != NULL && cg->is_virtual()) {
627 Node* cast = cast_not_null(receiver);
628 // %%% assert(receiver == cast, "should already have cast the receiver");
629 }
630
631 // Round double result after a call from strict to non-strict code
632 round_double_result(cg->method());
633
634 ciType* rtype = cg->method()->return_type();
635 ciType* ctype = declared_signature->return_type();
636
637 if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) {
638 // Be careful here with return types.
639 if (ctype != rtype) {
640 BasicType rt = rtype->basic_type();
641 BasicType ct = ctype->basic_type();
642 if (ct == T_VOID) {
643 // It's OK for a method to return a value that is discarded.
644 // The discarding does not require any special action from the caller.
645 // The Java code knows this, at VerifyType.isNullConversion.
646 pop_node(rt); // whatever it was, pop it
647 } else if (rt == T_INT || is_subword_type(rt)) {
648 // Nothing. These cases are handled in lambda form bytecode.
649 assert(ct == T_INT || is_subword_type(ct), "must match: rt=%s, ct=%s", type2name(rt), type2name(ct));
650 } else if (rt == T_OBJECT || rt == T_ARRAY) {
651 assert(ct == T_OBJECT || ct == T_ARRAY, "rt=%s, ct=%s", type2name(rt), type2name(ct));
652 if (ctype->is_loaded()) {
653 const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass());
654 const Type* sig_type = TypeOopPtr::make_from_klass(ctype->as_klass());
655 if (arg_type != NULL && !arg_type->higher_equal(sig_type)) {
656 Node* retnode = pop();
657 Node* cast_obj = _gvn.transform(new CheckCastPPNode(control(), retnode, sig_type));
658 push(cast_obj);
659 }
660 }
661 } else if (rt == T_VALUETYPE) {
662 assert(ct == T_VALUETYPE, "value type expected but got rt=%s, ct=%s", type2name(rt), type2name(ct));
663 if (rtype == C->env()->___Value_klass()) {
664 const Type* sig_type = TypeOopPtr::make_from_klass(ctype->as_klass());
665 Node* retnode = pop();
666 Node* cast = _gvn.transform(new CheckCastPPNode(control(), retnode, sig_type));
667 Node* vt = ValueTypeNode::make(_gvn, merged_memory(), cast);
668 push(vt);
669 } else {
670 assert(ctype == C->env()->___Value_klass(), "unexpected value type klass");
671 Node* retnode = pop();
672 assert(retnode->is_ValueType(), "inconsistent");
673 ValueTypeNode* vt = retnode->as_ValueType();
674 Node* alloc = vt->allocate(this);
675 Node* vtptr = _gvn.transform(new ValueTypePtrNode(vt, alloc, C));
676 push(vtptr);
677 }
678 } else {
679 assert(rt == ct, "unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct));
680 // push a zero; it's better than getting an oop/int mismatch
681 pop_node(rt);
682 Node* retnode = zerocon(ct);
683 push_node(ct, retnode);
684 }
685 // Now that the value is well-behaved, continue with the call-site type.
686 rtype = ctype;
687 }
688 } else {
689 // Symbolic resolution enforces the types to be the same.
690 // NOTE: We must relax the assert for unloaded types because two
691 // different ciType instances of the same unloaded class type
692 // can appear to be "loaded" by different loaders (depending on
693 // the accessing class).
694 assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype,
695 "mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name());
696 }
697
698 // If the return type of the method is not loaded, assert that the
699 // value we got is a null. Otherwise, we need to recompile.
700 if (!rtype->is_loaded()) {
701 if (PrintOpto && (Verbose || WizardMode)) {
702 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
703 cg->method()->print_name(); tty->cr();
704 }
705 if (C->log() != NULL) {
706 C->log()->elem("assert_null reason='return' klass='%d'",
707 C->log()->identify(rtype));
708 }
709 // If there is going to be a trap, put it at the next bytecode:
710 set_bci(iter().next_bci());
711 null_assert(peek());
712 set_bci(iter().cur_bci()); // put it back
713 }
714 BasicType ct = ctype->basic_type();
715 if (ct == T_OBJECT || ct == T_ARRAY) {
716 record_profiled_return_for_speculation();
717 }
718 }
719
720 // Restart record of parsing work after possible inlining of call
721 #ifndef PRODUCT
722 parse_histogram()->set_initial_state(bc());
723 #endif
724 }
725
726 //---------------------------catch_call_exceptions-----------------------------
727 // Put a Catch and CatchProj nodes behind a just-created call.
728 // Send their caught exceptions to the proper handler.
729 // This may be used after a call to the rethrow VM stub,
730 // when it is needed to process unloaded exception classes.
731 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
732 // Exceptions are delivered through this channel:
733 Node* i_o = this->i_o();
734
735 // Add a CatchNode.
736 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
737 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
738 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
739
740 bool default_handler = false;
741 for (; !handlers.is_done(); handlers.next()) {
742 ciExceptionHandler* h = handlers.handler();
743 int h_bci = h->handler_bci();
744 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
745 // Do not introduce unloaded exception types into the graph:
746 if (!h_klass->is_loaded()) {
747 if (saw_unloaded->contains(h_bci)) {
748 /* We've already seen an unloaded exception with h_bci,
749 so don't duplicate. Duplication will cause the CatchNode to be
750 unnecessarily large. See 4713716. */
751 continue;
752 } else {
753 saw_unloaded->append(h_bci);
754 }
755 }
756 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass);
757 // (We use make_from_klass because it respects UseUniqueSubclasses.)
758 h_extype = h_extype->join(TypeInstPtr::NOTNULL);
759 assert(!h_extype->empty(), "sanity");
760 // Note: It's OK if the BCIs repeat themselves.
761 bcis->append(h_bci);
762 extypes->append(h_extype);
763 if (h_bci == -1) {
764 default_handler = true;
765 }
766 }
767
768 if (!default_handler) {
769 bcis->append(-1);
770 extypes->append(TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr());
771 }
772
773 int len = bcis->length();
774 CatchNode *cn = new CatchNode(control(), i_o, len+1);
775 Node *catch_ = _gvn.transform(cn);
776
777 // now branch with the exception state to each of the (potential)
778 // handlers
779 for(int i=0; i < len; i++) {
780 // Setup JVM state to enter the handler.
781 PreserveJVMState pjvms(this);
782 // Locals are just copied from before the call.
783 // Get control from the CatchNode.
784 int handler_bci = bcis->at(i);
785 Node* ctrl = _gvn.transform( new CatchProjNode(catch_, i+1,handler_bci));
786 // This handler cannot happen?
787 if (ctrl == top()) continue;
788 set_control(ctrl);
789
790 // Create exception oop
791 const TypeInstPtr* extype = extypes->at(i)->is_instptr();
792 Node *ex_oop = _gvn.transform(new CreateExNode(extypes->at(i), ctrl, i_o));
793
794 // Handle unloaded exception classes.
795 if (saw_unloaded->contains(handler_bci)) {
796 // An unloaded exception type is coming here. Do an uncommon trap.
797 #ifndef PRODUCT
798 // We do not expect the same handler bci to take both cold unloaded
799 // and hot loaded exceptions. But, watch for it.
800 if ((Verbose || WizardMode) && extype->is_loaded()) {
801 tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci());
802 method()->print_name(); tty->cr();
803 } else if (PrintOpto && (Verbose || WizardMode)) {
804 tty->print("Bailing out on unloaded exception type ");
805 extype->klass()->print_name();
806 tty->print(" at bci:%d in ", bci());
807 method()->print_name(); tty->cr();
808 }
809 #endif
810 // Emit an uncommon trap instead of processing the block.
811 set_bci(handler_bci);
812 push_ex_oop(ex_oop);
813 uncommon_trap(Deoptimization::Reason_unloaded,
814 Deoptimization::Action_reinterpret,
815 extype->klass(), "!loaded exception");
816 set_bci(iter().cur_bci()); // put it back
817 continue;
818 }
819
820 // go to the exception handler
821 if (handler_bci < 0) { // merge with corresponding rethrow node
822 throw_to_exit(make_exception_state(ex_oop));
823 } else { // Else jump to corresponding handle
824 push_ex_oop(ex_oop); // Clear stack and push just the oop.
825 merge_exception(handler_bci);
826 }
827 }
828
829 // The first CatchProj is for the normal return.
830 // (Note: If this is a call to rethrow_Java, this node goes dead.)
831 set_control(_gvn.transform( new CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
832 }
833
834
835 //----------------------------catch_inline_exceptions--------------------------
836 // Handle all exceptions thrown by an inlined method or individual bytecode.
837 // Common case 1: we have no handler, so all exceptions merge right into
838 // the rethrow case.
839 // Case 2: we have some handlers, with loaded exception klasses that have
840 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming
841 // exception oop and branch to the handler directly.
842 // Case 3: We have some handlers with subklasses or are not loaded at
843 // compile-time. We have to call the runtime to resolve the exception.
844 // So we insert a RethrowCall and all the logic that goes with it.
845 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
846 // Caller is responsible for saving away the map for normal control flow!
847 assert(stopped(), "call set_map(NULL) first");
848 assert(method()->has_exception_handlers(), "don't come here w/o work to do");
849
850 Node* ex_node = saved_ex_oop(ex_map);
851 if (ex_node == top()) {
852 // No action needed.
853 return;
854 }
855 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
856 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
857 if (ex_type == NULL)
858 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
859
860 // determine potential exception handlers
861 ciExceptionHandlerStream handlers(method(), bci(),
862 ex_type->klass()->as_instance_klass(),
863 ex_type->klass_is_exact());
864
865 // Start executing from the given throw state. (Keep its stack, for now.)
866 // Get the exception oop as known at compile time.
867 ex_node = use_exception_state(ex_map);
868
869 // Get the exception oop klass from its header
870 Node* ex_klass_node = NULL;
871 if (has_ex_handler() && !ex_type->klass_is_exact()) {
872 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
873 ex_klass_node = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT));
874
875 // Compute the exception klass a little more cleverly.
876 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
877 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
878 // each arm of the Phi. If I know something clever about the exceptions
879 // I'm loading the class from, I can replace the LoadKlass with the
880 // klass constant for the exception oop.
881 if (ex_node->is_Phi()) {
882 ex_klass_node = new PhiNode(ex_node->in(0), TypeKlassPtr::OBJECT);
883 for (uint i = 1; i < ex_node->req(); i++) {
884 Node* ex_in = ex_node->in(i);
885 if (ex_in == top() || ex_in == NULL) {
886 // This path was not taken.
887 ex_klass_node->init_req(i, top());
888 continue;
889 }
890 Node* p = basic_plus_adr(ex_in, ex_in, oopDesc::klass_offset_in_bytes());
891 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT));
892 ex_klass_node->init_req( i, k );
893 }
894 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT);
895
896 }
897 }
898
899 // Scan the exception table for applicable handlers.
900 // If none, we can call rethrow() and be done!
901 // If precise (loaded with no subklasses), insert a D.S. style
902 // pointer compare to the correct handler and loop back.
903 // If imprecise, switch to the Rethrow VM-call style handling.
904
905 int remaining = handlers.count_remaining();
906
907 // iterate through all entries sequentially
908 for (;!handlers.is_done(); handlers.next()) {
909 ciExceptionHandler* handler = handlers.handler();
910
911 if (handler->is_rethrow()) {
912 // If we fell off the end of the table without finding an imprecise
913 // exception klass (and without finding a generic handler) then we
914 // know this exception is not handled in this method. We just rethrow
915 // the exception into the caller.
916 throw_to_exit(make_exception_state(ex_node));
917 return;
918 }
919
920 // exception handler bci range covers throw_bci => investigate further
921 int handler_bci = handler->handler_bci();
922
923 if (remaining == 1) {
924 push_ex_oop(ex_node); // Push exception oop for handler
925 if (PrintOpto && WizardMode) {
926 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
927 }
928 merge_exception(handler_bci); // jump to handler
929 return; // No more handling to be done here!
930 }
931
932 // Get the handler's klass
933 ciInstanceKlass* klass = handler->catch_klass();
934
935 if (!klass->is_loaded()) { // klass is not loaded?
936 // fall through into catch_call_exceptions which will emit a
937 // handler with an uncommon trap.
938 break;
939 }
940
941 if (klass->is_interface()) // should not happen, but...
942 break; // bail out
943
944 // Check the type of the exception against the catch type
945 const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
946 Node* con = _gvn.makecon(tk);
947 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
948 if (!stopped()) {
949 PreserveJVMState pjvms(this);
950 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
951 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
952 Node* ex_oop = _gvn.transform(new CheckCastPPNode(control(), ex_node, tinst));
953 push_ex_oop(ex_oop); // Push exception oop for handler
954 if (PrintOpto && WizardMode) {
955 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
956 klass->print_name();
957 tty->cr();
958 }
959 merge_exception(handler_bci);
960 }
961 set_control(not_subtype_ctrl);
962
963 // Come here if exception does not match handler.
964 // Carry on with more handler checks.
965 --remaining;
966 }
967
968 assert(!stopped(), "you should return if you finish the chain");
969
970 // Oops, need to call into the VM to resolve the klasses at runtime.
971 // Note: This call must not deoptimize, since it is not a real at this bci!
972 kill_dead_locals();
973
974 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
975 OptoRuntime::rethrow_Type(),
976 OptoRuntime::rethrow_stub(),
977 NULL, NULL,
978 ex_node);
979
980 // Rethrow is a pure call, no side effects, only a result.
981 // The result cannot be allocated, so we use I_O
982
983 // Catch exceptions from the rethrow
984 catch_call_exceptions(handlers);
985 }
986
987
988 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.)
989
990
991 #ifndef PRODUCT
992 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
993 if( CountCompiledCalls ) {
994 if( at_method_entry ) {
995 // bump invocation counter if top method (for statistics)
996 if (CountCompiledCalls && depth() == 1) {
997 const TypePtr* addr_type = TypeMetadataPtr::make(method());
998 Node* adr1 = makecon(addr_type);
999 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset()));
1000 increment_counter(adr2);
1001 }
1002 } else if (is_inline) {
1003 switch (bc()) {
1004 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
1005 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
1006 case Bytecodes::_invokestatic:
1007 case Bytecodes::_invokedynamic:
1008 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
1009 default: fatal("unexpected call bytecode");
1010 }
1011 } else {
1012 switch (bc()) {
1013 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
1014 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
1015 case Bytecodes::_invokestatic:
1016 case Bytecodes::_invokedynamic:
1017 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break;
1018 default: fatal("unexpected call bytecode");
1019 }
1020 }
1021 }
1022 }
1023 #endif //PRODUCT
1024
1025
1026 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, int bci, ciInstanceKlass* klass,
1027 ciKlass* holder, ciMethod* callee,
1028 const TypeOopPtr* receiver_type, bool is_virtual,
1029 bool& call_does_dispatch, int& vtable_index,
1030 bool check_access) {
1031 // Set default values for out-parameters.
1032 call_does_dispatch = true;
1033 vtable_index = Method::invalid_vtable_index;
1034
1035 // Choose call strategy.
1036 ciMethod* optimized_virtual_method = optimize_inlining(caller, bci, klass, callee,
1037 receiver_type, check_access);
1038
1039 // Have the call been sufficiently improved such that it is no longer a virtual?
1040 if (optimized_virtual_method != NULL) {
1041 callee = optimized_virtual_method;
1042 call_does_dispatch = false;
1043 } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) {
1044 // We can make a vtable call at this site
1045 vtable_index = callee->resolve_vtable_index(caller->holder(), holder);
1046 }
1047 return callee;
1048 }
1049
1050 // Identify possible target method and inlining style
1051 ciMethod* Compile::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass,
1052 ciMethod* callee, const TypeOopPtr* receiver_type,
1053 bool check_access) {
1054 // only use for virtual or interface calls
1055
1056 // If it is obviously final, do not bother to call find_monomorphic_target,
1057 // because the class hierarchy checks are not needed, and may fail due to
1058 // incompletely loaded classes. Since we do our own class loading checks
1059 // in this module, we may confidently bind to any method.
1060 if (callee->can_be_statically_bound()) {
1061 return callee;
1062 }
1063
1064 // Attempt to improve the receiver
1065 bool actual_receiver_is_exact = false;
1066 ciInstanceKlass* actual_receiver = klass;
1067 if (receiver_type != NULL) {
1068 // Array methods are all inherited from Object, and are monomorphic.
1069 // finalize() call on array is not allowed.
1070 if (receiver_type->isa_aryptr() &&
1071 callee->holder() == env()->Object_klass() &&
1072 callee->name() != ciSymbol::finalize_method_name()) {
1073 return callee;
1074 }
1075
1076 // All other interesting cases are instance klasses.
1077 if (!receiver_type->isa_instptr()) {
1078 return NULL;
1079 }
1080
1081 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass();
1082 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() &&
1083 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) {
1084 // ikl is a same or better type than the original actual_receiver,
1085 // e.g. static receiver from bytecodes.
1086 actual_receiver = ikl;
1087 // Is the actual_receiver exact?
1088 actual_receiver_is_exact = receiver_type->klass_is_exact();
1089 }
1090 }
1091
1092 ciInstanceKlass* calling_klass = caller->holder();
1093 ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver, check_access);
1094 if (cha_monomorphic_target != NULL) {
1095 assert(!cha_monomorphic_target->is_abstract(), "");
1096 // Look at the method-receiver type. Does it add "too much information"?
1097 ciKlass* mr_klass = cha_monomorphic_target->holder();
1098 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass);
1099 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) {
1100 // Calling this method would include an implicit cast to its holder.
1101 // %%% Not yet implemented. Would throw minor asserts at present.
1102 // %%% The most common wins are already gained by +UseUniqueSubclasses.
1103 // To fix, put the higher_equal check at the call of this routine,
1104 // and add a CheckCastPP to the receiver.
1105 if (TraceDependencies) {
1106 tty->print_cr("found unique CHA method, but could not cast up");
1107 tty->print(" method = ");
1108 cha_monomorphic_target->print();
1109 tty->cr();
1110 }
1111 if (log() != NULL) {
1112 log()->elem("missed_CHA_opportunity klass='%d' method='%d'",
1113 log()->identify(klass),
1114 log()->identify(cha_monomorphic_target));
1115 }
1116 cha_monomorphic_target = NULL;
1117 }
1118 }
1119 if (cha_monomorphic_target != NULL) {
1120 // Hardwiring a virtual.
1121 // If we inlined because CHA revealed only a single target method,
1122 // then we are dependent on that target method not getting overridden
1123 // by dynamic class loading. Be sure to test the "static" receiver
1124 // dest_method here, as opposed to the actual receiver, which may
1125 // falsely lead us to believe that the receiver is final or private.
1126 dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target);
1127 return cha_monomorphic_target;
1128 }
1129
1130 // If the type is exact, we can still bind the method w/o a vcall.
1131 // (This case comes after CHA so we can see how much extra work it does.)
1132 if (actual_receiver_is_exact) {
1133 // In case of evolution, there is a dependence on every inlined method, since each
1134 // such method can be changed when its class is redefined.
1135 ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver);
1136 if (exact_method != NULL) {
1137 if (PrintOpto) {
1138 tty->print(" Calling method via exact type @%d --- ", bci);
1139 exact_method->print_name();
1140 tty->cr();
1141 }
1142 return exact_method;
1143 }
1144 }
1145
1146 return NULL;
1147 }