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 = NULL;
496 if (receiver_node->is_ValueType()) {
497 receiver_type = TypeInstPtr::make(TypePtr::NotNull, _gvn.type(receiver_node)->is_valuetype()->value_klass());
498 } else {
499 receiver_type = _gvn.type(receiver_node)->isa_oopptr();
500 }
501 // call_does_dispatch and vtable_index are out-parameters. They might be changed.
502 // For arrays, klass below is Object. When vtable calls are used,
503 // resolving the call with Object would allow an illegal call to
504 // finalize() on an array. We use holder instead: illegal calls to
505 // finalize() won't be compiled as vtable calls (IC call
506 // resolution will catch the illegal call) and the few legal calls
507 // on array types won't be either.
508 callee = C->optimize_virtual_call(method(), bci(), klass, holder, orig_callee,
509 receiver_type, is_virtual,
510 call_does_dispatch, vtable_index); // out-parameters
511 speculative_receiver_type = receiver_type != NULL ? receiver_type->speculative_type() : NULL;
512 }
513
514 // invoke-super-special
515 if (iter().cur_bc_raw() == Bytecodes::_invokespecial && !orig_callee->is_object_initializer()) {
516 ciInstanceKlass* calling_klass = method()->holder();
517 ciInstanceKlass* sender_klass =
518 calling_klass->is_anonymous() ? calling_klass->host_klass() :
519 calling_klass;
520 if (sender_klass->is_interface()) {
521 Node* receiver_node = stack(sp() - nargs);
522 Node* cls_node = makecon(TypeKlassPtr::make(sender_klass));
523 Node* bad_type_ctrl = NULL;
524 Node* casted_receiver = gen_checkcast(receiver_node, cls_node, &bad_type_ctrl);
525 if (bad_type_ctrl != NULL) {
526 PreserveJVMState pjvms(this);
527 set_control(bad_type_ctrl);
528 uncommon_trap(Deoptimization::Reason_class_check,
529 Deoptimization::Action_none);
530 }
531 if (stopped()) {
532 return; // MUST uncommon-trap?
533 }
534 set_stack(sp() - nargs, casted_receiver);
535 }
536 }
537
538 // Note: It's OK to try to inline a virtual call.
539 // The call generator will not attempt to inline a polymorphic call
540 // unless it knows how to optimize the receiver dispatch.
541 bool try_inline = (C->do_inlining() || InlineAccessors);
542
543 // ---------------------
544 dec_sp(nargs); // Temporarily pop args for JVM state of call
545 JVMState* jvms = sync_jvms();
546
547 // ---------------------
548 // Decide call tactic.
549 // This call checks with CHA, the interpreter profile, intrinsics table, etc.
550 // It decides whether inlining is desirable or not.
551 CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type);
552
553 // NOTE: Don't use orig_callee and callee after this point! Use cg->method() instead.
554 orig_callee = callee = NULL;
555
556 // ---------------------
557 // Round double arguments before call
558 round_double_arguments(cg->method());
559
560 // Feed profiling data for arguments to the type system so it can
561 // propagate it as speculative types
562 record_profiled_arguments_for_speculation(cg->method(), bc());
563
564 #ifndef PRODUCT
565 // bump global counters for calls
566 count_compiled_calls(/*at_method_entry*/ false, cg->is_inline());
567
568 // Record first part of parsing work for this call
569 parse_histogram()->record_change();
570 #endif // not PRODUCT
571
572 assert(jvms == this->jvms(), "still operating on the right JVMS");
573 assert(jvms_in_sync(), "jvms must carry full info into CG");
574
575 // save across call, for a subsequent cast_not_null.
576 Node* receiver = has_receiver ? argument(0) : NULL;
577
578 // The extra CheckCastPPs for speculative types mess with PhaseStringOpts
579 if (receiver != NULL && !receiver->is_ValueType() && !call_does_dispatch && !cg->is_string_late_inline()) {
580 // Feed profiling data for a single receiver to the type system so
581 // it can propagate it as a speculative type
582 receiver = record_profiled_receiver_for_speculation(receiver);
583 }
584
585 // Bump method data counters (We profile *before* the call is made
586 // because exceptions don't return to the call site.)
587 profile_call(receiver);
588
589 JVMState* new_jvms = cg->generate(jvms);
590 if (new_jvms == NULL) {
591 // When inlining attempt fails (e.g., too many arguments),
592 // it may contaminate the current compile state, making it
593 // impossible to pull back and try again. Once we call
594 // cg->generate(), we are committed. If it fails, the whole
595 // compilation task is compromised.
596 if (failing()) return;
597
598 // This can happen if a library intrinsic is available, but refuses
599 // the call site, perhaps because it did not match a pattern the
600 // intrinsic was expecting to optimize. Should always be possible to
601 // get a normal java call that may inline in that case
602 cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type, /* allow_intrinsics= */ false);
603 new_jvms = cg->generate(jvms);
604 if (new_jvms == NULL) {
605 guarantee(failing(), "call failed to generate: calls should work");
606 return;
607 }
608 }
609
610 if (cg->is_inline()) {
611 // Accumulate has_loops estimate
612 C->set_has_loops(C->has_loops() || cg->method()->has_loops());
613 C->env()->notice_inlined_method(cg->method());
614 }
615
616 // Reset parser state from [new_]jvms, which now carries results of the call.
617 // Return value (if any) is already pushed on the stack by the cg.
618 add_exception_states_from(new_jvms);
619 if (new_jvms->map()->control() == top()) {
620 stop_and_kill_map();
621 } else {
622 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
623 set_jvms(new_jvms);
624 }
625
626 assert(check_call_consistency(jvms, cg), "inconsistent info");
627
628 if (!stopped()) {
629 // This was some sort of virtual call, which did a null check for us.
630 // Now we can assert receiver-not-null, on the normal return path.
631 if (receiver != NULL && cg->is_virtual()) {
632 Node* cast = cast_not_null(receiver);
633 // %%% assert(receiver == cast, "should already have cast the receiver");
634 }
635
636 // Round double result after a call from strict to non-strict code
637 round_double_result(cg->method());
638
639 ciType* rtype = cg->method()->return_type();
640 ciType* ctype = declared_signature->return_type();
641
642 if (rtype->basic_type() == T_VALUETYPE) {
643 Node* retnode = peek();
644 if (!retnode->is_ValueType()) {
645 pop();
646 assert(!cg->is_inline(), "should have ValueTypeNode result");
647 ciValueKlass* vk = _gvn.type(retnode)->value_klass();
648 // We will deoptimize if the return value is null and then need to continue execution after the call
649 ValueTypeNode* vt = ValueTypeNode::make_from_oop(this, retnode, vk, /* buffer_check */ false, /* null2default */ false, iter().next_bci());
650 push_node(T_VALUETYPE, vt);
651 }
652 }
653
654 if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) {
655 // Be careful here with return types.
656 if (ctype != rtype) {
657 BasicType rt = rtype->basic_type();
658 BasicType ct = ctype->basic_type();
659 if (ct == T_VOID) {
660 // It's OK for a method to return a value that is discarded.
661 // The discarding does not require any special action from the caller.
662 // The Java code knows this, at VerifyType.isNullConversion.
663 pop_node(rt); // whatever it was, pop it
664 } else if (rt == T_INT || is_subword_type(rt)) {
665 // Nothing. These cases are handled in lambda form bytecode.
666 assert(ct == T_INT || is_subword_type(ct), "must match: rt=%s, ct=%s", type2name(rt), type2name(ct));
667 } else if (rt == T_OBJECT || rt == T_ARRAY) {
668 assert(ct == T_OBJECT || ct == T_ARRAY || ct == T_VALUETYPE, "rt=%s, ct=%s", type2name(rt), type2name(ct));
669 if (ctype->is_loaded()) {
670 const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass());
671 const Type* sig_type = TypeOopPtr::make_from_klass(ctype->as_klass());
672 if (arg_type != NULL && !arg_type->higher_equal(sig_type)) {
673 Node* retnode = pop();
674 Node* cast_obj = _gvn.transform(new CheckCastPPNode(control(), retnode, sig_type));
675 if (ct == T_VALUETYPE) {
676 // We will deoptimize if the return value is null and then need to continue execution after the call
677 cast_obj = ValueTypeNode::make_from_oop(this, cast_obj, ctype->as_value_klass(), /* buffer_check */ false, /* null2default */ false, iter().next_bci());
678 }
679 push(cast_obj);
680 }
681 }
682 } else if (rt == T_VALUETYPE) {
683 assert(ct == T_OBJECT, "object expected but got ct=%s", type2name(ct));
684 ValueTypeNode* vt = pop()->as_ValueType();
685 vt = vt->allocate(this)->as_ValueType();
686 Node* vtptr = ValueTypePtrNode::make_from_value_type(_gvn, vt);
687 push(vtptr);
688 } else {
689 assert(rt == ct, "unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct));
690 // push a zero; it's better than getting an oop/int mismatch
691 pop_node(rt);
692 Node* retnode = zerocon(ct);
693 push_node(ct, retnode);
694 }
695 // Now that the value is well-behaved, continue with the call-site type.
696 rtype = ctype;
697 }
698 } else {
699 // Symbolic resolution enforces the types to be the same.
700 // NOTE: We must relax the assert for unloaded types because two
701 // different ciType instances of the same unloaded class type
702 // can appear to be "loaded" by different loaders (depending on
703 // the accessing class).
704 assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype,
705 "mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name());
706 }
707
708 // If the return type of the method is not loaded, assert that the
709 // value we got is a null. Otherwise, we need to recompile.
710 if (!rtype->is_loaded()) {
711 if (PrintOpto && (Verbose || WizardMode)) {
712 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
713 cg->method()->print_name(); tty->cr();
714 }
715 if (C->log() != NULL) {
716 C->log()->elem("assert_null reason='return' klass='%d'",
717 C->log()->identify(rtype));
718 }
719 // If there is going to be a trap, put it at the next bytecode:
720 set_bci(iter().next_bci());
721 null_assert(peek());
722 set_bci(iter().cur_bci()); // put it back
723 }
724 BasicType ct = ctype->basic_type();
725 if (ct == T_OBJECT || ct == T_ARRAY) {
726 record_profiled_return_for_speculation();
727 }
728 }
729
730 // Restart record of parsing work after possible inlining of call
731 #ifndef PRODUCT
732 parse_histogram()->set_initial_state(bc());
733 #endif
734 }
735
736 //---------------------------catch_call_exceptions-----------------------------
737 // Put a Catch and CatchProj nodes behind a just-created call.
738 // Send their caught exceptions to the proper handler.
739 // This may be used after a call to the rethrow VM stub,
740 // when it is needed to process unloaded exception classes.
741 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
742 // Exceptions are delivered through this channel:
743 Node* i_o = this->i_o();
744
745 // Add a CatchNode.
746 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
747 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
748 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
749
750 bool default_handler = false;
751 for (; !handlers.is_done(); handlers.next()) {
752 ciExceptionHandler* h = handlers.handler();
753 int h_bci = h->handler_bci();
754 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
755 // Do not introduce unloaded exception types into the graph:
756 if (!h_klass->is_loaded()) {
757 if (saw_unloaded->contains(h_bci)) {
758 /* We've already seen an unloaded exception with h_bci,
759 so don't duplicate. Duplication will cause the CatchNode to be
760 unnecessarily large. See 4713716. */
761 continue;
762 } else {
763 saw_unloaded->append(h_bci);
764 }
765 }
766 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass);
767 // (We use make_from_klass because it respects UseUniqueSubclasses.)
768 h_extype = h_extype->join(TypeInstPtr::NOTNULL);
769 assert(!h_extype->empty(), "sanity");
770 // Note: It's OK if the BCIs repeat themselves.
771 bcis->append(h_bci);
772 extypes->append(h_extype);
773 if (h_bci == -1) {
774 default_handler = true;
775 }
776 }
777
778 if (!default_handler) {
779 bcis->append(-1);
780 extypes->append(TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr());
781 }
782
783 int len = bcis->length();
784 CatchNode *cn = new CatchNode(control(), i_o, len+1);
785 Node *catch_ = _gvn.transform(cn);
786
787 // now branch with the exception state to each of the (potential)
788 // handlers
789 for(int i=0; i < len; i++) {
790 // Setup JVM state to enter the handler.
791 PreserveJVMState pjvms(this);
792 // Locals are just copied from before the call.
793 // Get control from the CatchNode.
794 int handler_bci = bcis->at(i);
795 Node* ctrl = _gvn.transform( new CatchProjNode(catch_, i+1,handler_bci));
796 // This handler cannot happen?
797 if (ctrl == top()) continue;
798 set_control(ctrl);
799
800 // Create exception oop
801 const TypeInstPtr* extype = extypes->at(i)->is_instptr();
802 Node *ex_oop = _gvn.transform(new CreateExNode(extypes->at(i), ctrl, i_o));
803
804 // Handle unloaded exception classes.
805 if (saw_unloaded->contains(handler_bci)) {
806 // An unloaded exception type is coming here. Do an uncommon trap.
807 #ifndef PRODUCT
808 // We do not expect the same handler bci to take both cold unloaded
809 // and hot loaded exceptions. But, watch for it.
810 if ((Verbose || WizardMode) && extype->is_loaded()) {
811 tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci());
812 method()->print_name(); tty->cr();
813 } else if (PrintOpto && (Verbose || WizardMode)) {
814 tty->print("Bailing out on unloaded exception type ");
815 extype->klass()->print_name();
816 tty->print(" at bci:%d in ", bci());
817 method()->print_name(); tty->cr();
818 }
819 #endif
820 // Emit an uncommon trap instead of processing the block.
821 set_bci(handler_bci);
822 push_ex_oop(ex_oop);
823 uncommon_trap(Deoptimization::Reason_unloaded,
824 Deoptimization::Action_reinterpret,
825 extype->klass(), "!loaded exception");
826 set_bci(iter().cur_bci()); // put it back
827 continue;
828 }
829
830 // go to the exception handler
831 if (handler_bci < 0) { // merge with corresponding rethrow node
832 throw_to_exit(make_exception_state(ex_oop));
833 } else { // Else jump to corresponding handle
834 push_ex_oop(ex_oop); // Clear stack and push just the oop.
835 merge_exception(handler_bci);
836 }
837 }
838
839 // The first CatchProj is for the normal return.
840 // (Note: If this is a call to rethrow_Java, this node goes dead.)
841 set_control(_gvn.transform( new CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
842 }
843
844
845 //----------------------------catch_inline_exceptions--------------------------
846 // Handle all exceptions thrown by an inlined method or individual bytecode.
847 // Common case 1: we have no handler, so all exceptions merge right into
848 // the rethrow case.
849 // Case 2: we have some handlers, with loaded exception klasses that have
850 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming
851 // exception oop and branch to the handler directly.
852 // Case 3: We have some handlers with subklasses or are not loaded at
853 // compile-time. We have to call the runtime to resolve the exception.
854 // So we insert a RethrowCall and all the logic that goes with it.
855 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
856 // Caller is responsible for saving away the map for normal control flow!
857 assert(stopped(), "call set_map(NULL) first");
858 assert(method()->has_exception_handlers(), "don't come here w/o work to do");
859
860 Node* ex_node = saved_ex_oop(ex_map);
861 if (ex_node == top()) {
862 // No action needed.
863 return;
864 }
865 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
866 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
867 if (ex_type == NULL)
868 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
869
870 // determine potential exception handlers
871 ciExceptionHandlerStream handlers(method(), bci(),
872 ex_type->klass()->as_instance_klass(),
873 ex_type->klass_is_exact());
874
875 // Start executing from the given throw state. (Keep its stack, for now.)
876 // Get the exception oop as known at compile time.
877 ex_node = use_exception_state(ex_map);
878
879 // Get the exception oop klass from its header
880 Node* ex_klass_node = NULL;
881 if (has_ex_handler() && !ex_type->klass_is_exact()) {
882 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
883 ex_klass_node = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT));
884
885 // Compute the exception klass a little more cleverly.
886 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
887 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
888 // each arm of the Phi. If I know something clever about the exceptions
889 // I'm loading the class from, I can replace the LoadKlass with the
890 // klass constant for the exception oop.
891 if (ex_node->is_Phi()) {
892 ex_klass_node = new PhiNode(ex_node->in(0), TypeKlassPtr::OBJECT);
893 for (uint i = 1; i < ex_node->req(); i++) {
894 Node* ex_in = ex_node->in(i);
895 if (ex_in == top() || ex_in == NULL) {
896 // This path was not taken.
897 ex_klass_node->init_req(i, top());
898 continue;
899 }
900 Node* p = basic_plus_adr(ex_in, ex_in, oopDesc::klass_offset_in_bytes());
901 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT));
902 ex_klass_node->init_req( i, k );
903 }
904 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT);
905
906 }
907 }
908
909 // Scan the exception table for applicable handlers.
910 // If none, we can call rethrow() and be done!
911 // If precise (loaded with no subklasses), insert a D.S. style
912 // pointer compare to the correct handler and loop back.
913 // If imprecise, switch to the Rethrow VM-call style handling.
914
915 int remaining = handlers.count_remaining();
916
917 // iterate through all entries sequentially
918 for (;!handlers.is_done(); handlers.next()) {
919 ciExceptionHandler* handler = handlers.handler();
920
921 if (handler->is_rethrow()) {
922 // If we fell off the end of the table without finding an imprecise
923 // exception klass (and without finding a generic handler) then we
924 // know this exception is not handled in this method. We just rethrow
925 // the exception into the caller.
926 throw_to_exit(make_exception_state(ex_node));
927 return;
928 }
929
930 // exception handler bci range covers throw_bci => investigate further
931 int handler_bci = handler->handler_bci();
932
933 if (remaining == 1) {
934 push_ex_oop(ex_node); // Push exception oop for handler
935 if (PrintOpto && WizardMode) {
936 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
937 }
938 merge_exception(handler_bci); // jump to handler
939 return; // No more handling to be done here!
940 }
941
942 // Get the handler's klass
943 ciInstanceKlass* klass = handler->catch_klass();
944
945 if (!klass->is_loaded()) { // klass is not loaded?
946 // fall through into catch_call_exceptions which will emit a
947 // handler with an uncommon trap.
948 break;
949 }
950
951 if (klass->is_interface()) // should not happen, but...
952 break; // bail out
953
954 // Check the type of the exception against the catch type
955 const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
956 Node* con = _gvn.makecon(tk);
957 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
958 if (!stopped()) {
959 PreserveJVMState pjvms(this);
960 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
961 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
962 Node* ex_oop = _gvn.transform(new CheckCastPPNode(control(), ex_node, tinst));
963 push_ex_oop(ex_oop); // Push exception oop for handler
964 if (PrintOpto && WizardMode) {
965 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
966 klass->print_name();
967 tty->cr();
968 }
969 merge_exception(handler_bci);
970 }
971 set_control(not_subtype_ctrl);
972
973 // Come here if exception does not match handler.
974 // Carry on with more handler checks.
975 --remaining;
976 }
977
978 assert(!stopped(), "you should return if you finish the chain");
979
980 // Oops, need to call into the VM to resolve the klasses at runtime.
981 // Note: This call must not deoptimize, since it is not a real at this bci!
982 kill_dead_locals();
983
984 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
985 OptoRuntime::rethrow_Type(),
986 OptoRuntime::rethrow_stub(),
987 NULL, NULL,
988 ex_node);
989
990 // Rethrow is a pure call, no side effects, only a result.
991 // The result cannot be allocated, so we use I_O
992
993 // Catch exceptions from the rethrow
994 catch_call_exceptions(handlers);
995 }
996
997
998 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.)
999
1000
1001 #ifndef PRODUCT
1002 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
1003 if( CountCompiledCalls ) {
1004 if( at_method_entry ) {
1005 // bump invocation counter if top method (for statistics)
1006 if (CountCompiledCalls && depth() == 1) {
1007 const TypePtr* addr_type = TypeMetadataPtr::make(method());
1008 Node* adr1 = makecon(addr_type);
1009 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset()));
1010 increment_counter(adr2);
1011 }
1012 } else if (is_inline) {
1013 switch (bc()) {
1014 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
1015 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
1016 case Bytecodes::_invokestatic:
1017 case Bytecodes::_invokedynamic:
1018 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
1019 default: fatal("unexpected call bytecode");
1020 }
1021 } else {
1022 switch (bc()) {
1023 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
1024 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
1025 case Bytecodes::_invokestatic:
1026 case Bytecodes::_invokedynamic:
1027 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break;
1028 default: fatal("unexpected call bytecode");
1029 }
1030 }
1031 }
1032 }
1033 #endif //PRODUCT
1034
1035
1036 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, int bci, ciInstanceKlass* klass,
1037 ciKlass* holder, ciMethod* callee,
1038 const TypeOopPtr* receiver_type, bool is_virtual,
1039 bool& call_does_dispatch, int& vtable_index,
1040 bool check_access) {
1041 // Set default values for out-parameters.
1042 call_does_dispatch = true;
1043 vtable_index = Method::invalid_vtable_index;
1044
1045 // Choose call strategy.
1046 ciMethod* optimized_virtual_method = optimize_inlining(caller, bci, klass, callee,
1047 receiver_type, check_access);
1048
1049 // Have the call been sufficiently improved such that it is no longer a virtual?
1050 if (optimized_virtual_method != NULL) {
1051 callee = optimized_virtual_method;
1052 call_does_dispatch = false;
1053 } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) {
1054 // We can make a vtable call at this site
1055 vtable_index = callee->resolve_vtable_index(caller->holder(), holder);
1056 }
1057 return callee;
1058 }
1059
1060 // Identify possible target method and inlining style
1061 ciMethod* Compile::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass,
1062 ciMethod* callee, const TypeOopPtr* receiver_type,
1063 bool check_access) {
1064 // only use for virtual or interface calls
1065
1066 // If it is obviously final, do not bother to call find_monomorphic_target,
1067 // because the class hierarchy checks are not needed, and may fail due to
1068 // incompletely loaded classes. Since we do our own class loading checks
1069 // in this module, we may confidently bind to any method.
1070 if (callee->can_be_statically_bound()) {
1071 return callee;
1072 }
1073
1074 // Attempt to improve the receiver
1075 bool actual_receiver_is_exact = false;
1076 ciInstanceKlass* actual_receiver = klass;
1077 if (receiver_type != NULL) {
1078 // Array methods are all inherited from Object, and are monomorphic.
1079 // finalize() call on array is not allowed.
1080 if (receiver_type->isa_aryptr() &&
1081 callee->holder() == env()->Object_klass() &&
1082 callee->name() != ciSymbol::finalize_method_name()) {
1083 return callee;
1084 }
1085
1086 // All other interesting cases are instance klasses.
1087 if (!receiver_type->isa_instptr()) {
1088 return NULL;
1089 }
1090
1091 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass();
1092 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() &&
1093 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) {
1094 // ikl is a same or better type than the original actual_receiver,
1095 // e.g. static receiver from bytecodes.
1096 actual_receiver = ikl;
1097 // Is the actual_receiver exact?
1098 actual_receiver_is_exact = receiver_type->klass_is_exact();
1099 }
1100 }
1101
1102 ciInstanceKlass* calling_klass = caller->holder();
1103 ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver, check_access);
1104 if (cha_monomorphic_target != NULL) {
1105 assert(!cha_monomorphic_target->is_abstract(), "");
1106 // Look at the method-receiver type. Does it add "too much information"?
1107 ciKlass* mr_klass = cha_monomorphic_target->holder();
1108 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass);
1109 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) {
1110 // Calling this method would include an implicit cast to its holder.
1111 // %%% Not yet implemented. Would throw minor asserts at present.
1112 // %%% The most common wins are already gained by +UseUniqueSubclasses.
1113 // To fix, put the higher_equal check at the call of this routine,
1114 // and add a CheckCastPP to the receiver.
1115 if (TraceDependencies) {
1116 tty->print_cr("found unique CHA method, but could not cast up");
1117 tty->print(" method = ");
1118 cha_monomorphic_target->print();
1119 tty->cr();
1120 }
1121 if (log() != NULL) {
1122 log()->elem("missed_CHA_opportunity klass='%d' method='%d'",
1123 log()->identify(klass),
1124 log()->identify(cha_monomorphic_target));
1125 }
1126 cha_monomorphic_target = NULL;
1127 }
1128 }
1129 if (cha_monomorphic_target != NULL) {
1130 // Hardwiring a virtual.
1131 // If we inlined because CHA revealed only a single target method,
1132 // then we are dependent on that target method not getting overridden
1133 // by dynamic class loading. Be sure to test the "static" receiver
1134 // dest_method here, as opposed to the actual receiver, which may
1135 // falsely lead us to believe that the receiver is final or private.
1136 dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target);
1137 return cha_monomorphic_target;
1138 }
1139
1140 // If the type is exact, we can still bind the method w/o a vcall.
1141 // (This case comes after CHA so we can see how much extra work it does.)
1142 if (actual_receiver_is_exact) {
1143 // In case of evolution, there is a dependence on every inlined method, since each
1144 // such method can be changed when its class is redefined.
1145 ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver);
1146 if (exact_method != NULL) {
1147 if (PrintOpto) {
1148 tty->print(" Calling method via exact type @%d --- ", bci);
1149 exact_method->print_name();
1150 tty->cr();
1151 }
1152 return exact_method;
1153 }
1154 }
1155
1156 return NULL;
1157 }