1 /*
2 * Copyright (c) 1998, 2018, 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 && UseTypeProfile) {
207 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
208 bool have_major_receiver = profile.has_receiver(0) && (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_or_recompiles(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
264 : Deoptimization::reason_class_check(speculative_receiver_type != NULL));
265 if ((morphism == 1 || (morphism == 2 && next_hit_cg != NULL)) &&
266 !too_many_traps_or_recompiles(caller, bci, reason)
267 ) {
268 // Generate uncommon trap for class check failure path
269 // in case of monomorphic or bimorphic virtual call site.
270 miss_cg = CallGenerator::for_uncommon_trap(callee, reason,
271 Deoptimization::Action_maybe_recompile);
272 } else {
273 // Generate virtual call for class check failure path
274 // in case of polymorphic virtual call site.
275 miss_cg = CallGenerator::for_virtual_call(callee, vtable_index);
276 }
277 if (miss_cg != NULL) {
278 if (next_hit_cg != NULL) {
279 assert(speculative_receiver_type == NULL, "shouldn't end up here if we used speculation");
280 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1));
281 // We don't need to record dependency on a receiver here and below.
282 // Whenever we inline, the dependency is added by Parse::Parse().
283 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
284 }
285 if (miss_cg != NULL) {
286 ciKlass* k = speculative_receiver_type != NULL ? speculative_receiver_type : profile.receiver(0);
287 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, k, site_count, receiver_count);
288 float hit_prob = speculative_receiver_type != NULL ? 1.0 : profile.receiver_prob(0);
289 CallGenerator* cg = CallGenerator::for_predicted_call(k, miss_cg, hit_cg, hit_prob);
290 if (cg != NULL) return cg;
291 }
292 }
293 }
294 }
295 }
296
297 // If there is only one implementor of this interface then we
298 // may be able to bind this invoke directly to the implementing
299 // klass but we need both a dependence on the single interface
300 // and on the method we bind to. Additionally since all we know
301 // about the receiver type is that it's supposed to implement the
302 // interface we have to insert a check that it's the class we
303 // expect. Interface types are not checked by the verifier so
304 // they are roughly equivalent to Object.
305 // The number of implementors for declared_interface is less or
306 // equal to the number of implementors for target->holder() so
307 // if number of implementors of target->holder() == 1 then
308 // number of implementors for decl_interface is 0 or 1. If
309 // it's 0 then no class implements decl_interface and there's
310 // no point in inlining.
311 if (call_does_dispatch && bytecode == Bytecodes::_invokeinterface) {
312 ciInstanceKlass* declared_interface =
313 caller->get_declared_method_holder_at_bci(bci)->as_instance_klass();
314
315 if (declared_interface->nof_implementors() == 1 &&
316 (!callee->is_default_method() || callee->is_overpass()) /* CHA doesn't support default methods yet */) {
317 ciInstanceKlass* singleton = declared_interface->implementor();
318 ciMethod* cha_monomorphic_target =
319 callee->find_monomorphic_target(caller->holder(), declared_interface, singleton);
320
321 if (cha_monomorphic_target != NULL &&
322 cha_monomorphic_target->holder() != env()->Object_klass()) { // subtype check against Object is useless
323 ciKlass* holder = cha_monomorphic_target->holder();
324
325 // Try to inline the method found by CHA. Inlined method is guarded by the type check.
326 CallGenerator* hit_cg = call_generator(cha_monomorphic_target,
327 vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
328
329 // Deoptimize on type check fail. The interpreter will throw ICCE for us.
330 CallGenerator* miss_cg = CallGenerator::for_uncommon_trap(callee,
331 Deoptimization::Reason_class_check, Deoptimization::Action_none);
332
333 CallGenerator* cg = CallGenerator::for_guarded_call(holder, miss_cg, hit_cg);
334 if (hit_cg != NULL && cg != NULL) {
335 dependencies()->assert_unique_concrete_method(declared_interface, cha_monomorphic_target);
336 return cg;
337 }
338 }
339 }
340 }
341 }
342
343 // Nothing claimed the intrinsic, we go with straight-forward inlining
344 // for already discovered intrinsic.
345 if (allow_inline && allow_intrinsics && cg_intrinsic != NULL) {
346 assert(cg_intrinsic->does_virtual_dispatch(), "sanity");
347 return cg_intrinsic;
348 }
349
350 // There was no special inlining tactic, or it bailed out.
351 // Use a more generic tactic, like a simple call.
352 if (call_does_dispatch) {
353 const char* msg = "virtual call";
354 if (PrintInlining) print_inlining(callee, jvms->depth() - 1, jvms->bci(), msg);
355 C->log_inline_failure(msg);
356 return CallGenerator::for_virtual_call(callee, vtable_index);
357 } else {
358 // Class Hierarchy Analysis or Type Profile reveals a unique target,
359 // or it is a static or special call.
360 return CallGenerator::for_direct_call(callee, should_delay_inlining(callee, jvms));
361 }
362 }
363
364 // Return true for methods that shouldn't be inlined early so that
365 // they are easier to analyze and optimize as intrinsics.
366 bool Compile::should_delay_string_inlining(ciMethod* call_method, JVMState* jvms) {
367 if (has_stringbuilder()) {
368
369 if ((call_method->holder() == C->env()->StringBuilder_klass() ||
370 call_method->holder() == C->env()->StringBuffer_klass()) &&
371 (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
372 jvms->method()->holder() == C->env()->StringBuffer_klass())) {
373 // Delay SB calls only when called from non-SB code
374 return false;
375 }
376
377 switch (call_method->intrinsic_id()) {
378 case vmIntrinsics::_StringBuilder_void:
379 case vmIntrinsics::_StringBuilder_int:
380 case vmIntrinsics::_StringBuilder_String:
381 case vmIntrinsics::_StringBuilder_append_char:
382 case vmIntrinsics::_StringBuilder_append_int:
383 case vmIntrinsics::_StringBuilder_append_String:
384 case vmIntrinsics::_StringBuilder_toString:
385 case vmIntrinsics::_StringBuffer_void:
386 case vmIntrinsics::_StringBuffer_int:
387 case vmIntrinsics::_StringBuffer_String:
388 case vmIntrinsics::_StringBuffer_append_char:
389 case vmIntrinsics::_StringBuffer_append_int:
390 case vmIntrinsics::_StringBuffer_append_String:
391 case vmIntrinsics::_StringBuffer_toString:
392 case vmIntrinsics::_Integer_toString:
393 return true;
394
395 case vmIntrinsics::_String_String:
396 {
397 Node* receiver = jvms->map()->in(jvms->argoff() + 1);
398 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
399 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
400 ciMethod* m = csj->method();
401 if (m != NULL &&
402 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
403 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
404 // Delay String.<init>(new SB())
405 return true;
406 }
407 return false;
408 }
409
410 default:
411 return false;
412 }
413 }
414 return false;
415 }
416
417 bool Compile::should_delay_boxing_inlining(ciMethod* call_method, JVMState* jvms) {
418 if (eliminate_boxing() && call_method->is_boxing_method()) {
419 set_has_boxed_value(true);
420 return aggressive_unboxing();
421 }
422 return false;
423 }
424
425 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
426 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
427 // Additional inputs to consider...
428 // bc = bc()
429 // caller = method()
430 // iter().get_method_holder_index()
431 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
432 // Interface classes can be loaded & linked and never get around to
433 // being initialized. Uncommon-trap for not-initialized static or
434 // v-calls. Let interface calls happen.
435 ciInstanceKlass* holder_klass = dest_method->holder();
436 if (!holder_klass->is_being_initialized() &&
437 !holder_klass->is_initialized() &&
438 !holder_klass->is_interface()) {
439 uncommon_trap(Deoptimization::Reason_uninitialized,
440 Deoptimization::Action_reinterpret,
441 holder_klass);
442 return true;
443 }
444
445 assert(dest_method->is_loaded(), "dest_method: typeflow responsibility");
446 return false;
447 }
448
449 #ifdef ASSERT
450 static bool check_call_consistency(JVMState* jvms, CallGenerator* cg) {
451 ciMethod* symbolic_info = jvms->method()->get_method_at_bci(jvms->bci());
452 ciMethod* resolved_method = cg->method();
453 if (!ciMethod::is_consistent_info(symbolic_info, resolved_method)) {
454 tty->print_cr("JVMS:");
455 jvms->dump();
456 tty->print_cr("Bytecode info:");
457 jvms->method()->get_method_at_bci(jvms->bci())->print(); tty->cr();
458 tty->print_cr("Resolved method:");
459 cg->method()->print(); tty->cr();
460 return false;
461 }
462 return true;
463 }
464 #endif // ASSERT
465
466 //------------------------------do_call----------------------------------------
467 // Handle your basic call. Inline if we can & want to, else just setup call.
468 void Parse::do_call() {
469 // It's likely we are going to add debug info soon.
470 // Also, if we inline a guy who eventually needs debug info for this JVMS,
471 // our contribution to it is cleaned up right here.
472 kill_dead_locals();
473
474 C->print_inlining_assert_ready();
475
476 // Set frequently used booleans
477 const bool is_virtual = bc() == Bytecodes::_invokevirtual;
478 const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
479 const bool has_receiver = Bytecodes::has_receiver(bc());
480
481 // Find target being called
482 bool will_link;
483 ciSignature* declared_signature = NULL;
484 ciMethod* orig_callee = iter().get_method(will_link, &declared_signature); // callee in the bytecode
485 ciInstanceKlass* holder_klass = orig_callee->holder();
486 ciKlass* holder = iter().get_declared_method_holder();
487 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
488 assert(declared_signature != NULL, "cannot be null");
489
490 // Bump max node limit for JSR292 users
491 if (bc() == Bytecodes::_invokedynamic || orig_callee->is_method_handle_intrinsic()) {
492 C->set_max_node_limit(3*MaxNodeLimit);
493 }
494
495 // uncommon-trap when callee is unloaded, uninitialized or will not link
496 // bailout when too many arguments for register representation
497 if (!will_link || can_not_compile_call_site(orig_callee, klass)) {
498 if (PrintOpto && (Verbose || WizardMode)) {
499 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
500 orig_callee->print_name(); tty->cr();
501 }
502 return;
503 }
504 assert(holder_klass->is_loaded(), "");
505 //assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); // XXX invokehandle (cur_bc_raw)
506 // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
507 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
508 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
509 // Note: In the absence of miranda methods, an abstract class K can perform
510 // an invokevirtual directly on an interface method I.m if K implements I.
511
512 // orig_callee is the resolved callee which's signature includes the
513 // appendix argument.
514 const int nargs = orig_callee->arg_size();
515 const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id());
516
517 // Push appendix argument (MethodType, CallSite, etc.), if one.
518 if (iter().has_appendix()) {
519 ciObject* appendix_arg = iter().get_appendix();
520 const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg, /* require_const= */ true);
521 Node* appendix_arg_node = _gvn.makecon(appendix_arg_type);
522 push(appendix_arg_node);
523 }
524
525 // ---------------------
526 // Does Class Hierarchy Analysis reveal only a single target of a v-call?
527 // Then we may inline or make a static call, but become dependent on there being only 1 target.
528 // Does the call-site type profile reveal only one receiver?
529 // Then we may introduce a run-time check and inline on the path where it succeeds.
530 // The other path may uncommon_trap, check for another receiver, or do a v-call.
531
532 // Try to get the most accurate receiver type
533 ciMethod* callee = orig_callee;
534 int vtable_index = Method::invalid_vtable_index;
535 bool call_does_dispatch = false;
536
537 // Speculative type of the receiver if any
538 ciKlass* speculative_receiver_type = NULL;
539 if (is_virtual_or_interface) {
540 Node* receiver_node = stack(sp() - nargs);
541 const TypeOopPtr* receiver_type = NULL;
542 if (receiver_node->is_ValueType()) {
543 receiver_type = TypeInstPtr::make(TypePtr::NotNull, _gvn.type(receiver_node)->is_valuetype()->value_klass());
544 } else {
545 receiver_type = _gvn.type(receiver_node)->isa_oopptr();
546 }
547 // call_does_dispatch and vtable_index are out-parameters. They might be changed.
548 // For arrays, klass below is Object. When vtable calls are used,
549 // resolving the call with Object would allow an illegal call to
550 // finalize() on an array. We use holder instead: illegal calls to
551 // finalize() won't be compiled as vtable calls (IC call
552 // resolution will catch the illegal call) and the few legal calls
553 // on array types won't be either.
554 callee = C->optimize_virtual_call(method(), bci(), klass, holder, orig_callee,
555 receiver_type, is_virtual,
556 call_does_dispatch, vtable_index); // out-parameters
557 speculative_receiver_type = receiver_type != NULL ? receiver_type->speculative_type() : NULL;
558 }
559
560 // Additional receiver subtype checks for interface calls via invokespecial or invokeinterface.
561 ciKlass* receiver_constraint = NULL;
562 if (iter().cur_bc_raw() == Bytecodes::_invokespecial && !orig_callee->is_object_initializer()) {
563 ciInstanceKlass* calling_klass = method()->holder();
564 ciInstanceKlass* sender_klass =
565 calling_klass->is_unsafe_anonymous() ? calling_klass->unsafe_anonymous_host() :
566 calling_klass;
567 if (sender_klass->is_interface()) {
568 receiver_constraint = sender_klass;
569 }
570 } else if (iter().cur_bc_raw() == Bytecodes::_invokeinterface && orig_callee->is_private()) {
571 assert(holder->is_interface(), "How did we get a non-interface method here!");
572 receiver_constraint = holder;
573 }
574
575 if (receiver_constraint != NULL) {
576 Node* receiver_node = stack(sp() - nargs);
577 Node* cls_node = makecon(TypeKlassPtr::make(receiver_constraint));
578 Node* bad_type_ctrl = NULL;
579 Node* casted_receiver = gen_checkcast(receiver_node, cls_node, &bad_type_ctrl);
580 if (bad_type_ctrl != NULL) {
581 PreserveJVMState pjvms(this);
582 set_control(bad_type_ctrl);
583 uncommon_trap(Deoptimization::Reason_class_check,
584 Deoptimization::Action_none);
585 }
586 if (stopped()) {
587 return; // MUST uncommon-trap?
588 }
589 set_stack(sp() - nargs, casted_receiver);
590 }
591
592 // Note: It's OK to try to inline a virtual call.
593 // The call generator will not attempt to inline a polymorphic call
594 // unless it knows how to optimize the receiver dispatch.
595 bool try_inline = (C->do_inlining() || InlineAccessors);
596
597 // ---------------------
598 dec_sp(nargs); // Temporarily pop args for JVM state of call
599 JVMState* jvms = sync_jvms();
600
601 // ---------------------
602 // Decide call tactic.
603 // This call checks with CHA, the interpreter profile, intrinsics table, etc.
604 // It decides whether inlining is desirable or not.
605 CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type);
606
607 // NOTE: Don't use orig_callee and callee after this point! Use cg->method() instead.
608 orig_callee = callee = NULL;
609
610 // ---------------------
611 // Round double arguments before call
612 round_double_arguments(cg->method());
613
614 // Feed profiling data for arguments to the type system so it can
615 // propagate it as speculative types
616 record_profiled_arguments_for_speculation(cg->method(), bc());
617
618 #ifndef PRODUCT
619 // bump global counters for calls
620 count_compiled_calls(/*at_method_entry*/ false, cg->is_inline());
621
622 // Record first part of parsing work for this call
623 parse_histogram()->record_change();
624 #endif // not PRODUCT
625
626 assert(jvms == this->jvms(), "still operating on the right JVMS");
627 assert(jvms_in_sync(), "jvms must carry full info into CG");
628
629 // save across call, for a subsequent cast_not_null.
630 Node* receiver = has_receiver ? argument(0) : NULL;
631
632 // The extra CheckCastPPs for speculative types mess with PhaseStringOpts
633 if (receiver != NULL && !receiver->is_ValueType() && !call_does_dispatch && !cg->is_string_late_inline()) {
634 // Feed profiling data for a single receiver to the type system so
635 // it can propagate it as a speculative type
636 receiver = record_profiled_receiver_for_speculation(receiver);
637 }
638
639 // Bump method data counters (We profile *before* the call is made
640 // because exceptions don't return to the call site.)
641 profile_call(receiver);
642
643 JVMState* new_jvms = cg->generate(jvms);
644 if (new_jvms == NULL) {
645 // When inlining attempt fails (e.g., too many arguments),
646 // it may contaminate the current compile state, making it
647 // impossible to pull back and try again. Once we call
648 // cg->generate(), we are committed. If it fails, the whole
649 // compilation task is compromised.
650 if (failing()) return;
651
652 // This can happen if a library intrinsic is available, but refuses
653 // the call site, perhaps because it did not match a pattern the
654 // intrinsic was expecting to optimize. Should always be possible to
655 // get a normal java call that may inline in that case
656 cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type, /* allow_intrinsics= */ false);
657 new_jvms = cg->generate(jvms);
658 if (new_jvms == NULL) {
659 guarantee(failing(), "call failed to generate: calls should work");
660 return;
661 }
662 }
663
664 if (cg->is_inline()) {
665 // Accumulate has_loops estimate
666 C->set_has_loops(C->has_loops() || cg->method()->has_loops());
667 C->env()->notice_inlined_method(cg->method());
668 }
669
670 // Reset parser state from [new_]jvms, which now carries results of the call.
671 // Return value (if any) is already pushed on the stack by the cg.
672 add_exception_states_from(new_jvms);
673 if (new_jvms->map()->control() == top()) {
674 stop_and_kill_map();
675 } else {
676 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
677 set_jvms(new_jvms);
678 }
679
680 assert(check_call_consistency(jvms, cg), "inconsistent info");
681
682 if (!stopped()) {
683 // This was some sort of virtual call, which did a null check for us.
684 // Now we can assert receiver-not-null, on the normal return path.
685 if (receiver != NULL && cg->is_virtual()) {
686 Node* cast = cast_not_null(receiver);
687 // %%% assert(receiver == cast, "should already have cast the receiver");
688 }
689
690 // Round double result after a call from strict to non-strict code
691 round_double_result(cg->method());
692
693 ciType* rtype = cg->method()->return_type();
694 ciType* ctype = declared_signature->return_type();
695
696 if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) {
697 // Be careful here with return types.
698 if (ctype != rtype) {
699 BasicType rt = rtype->basic_type();
700 BasicType ct = ctype->basic_type();
701 if (ct == T_VOID) {
702 // It's OK for a method to return a value that is discarded.
703 // The discarding does not require any special action from the caller.
704 // The Java code knows this, at VerifyType.isNullConversion.
705 pop_node(rt); // whatever it was, pop it
706 } else if (rt == T_INT || is_subword_type(rt)) {
707 // Nothing. These cases are handled in lambda form bytecode.
708 assert(ct == T_INT || is_subword_type(ct), "must match: rt=%s, ct=%s", type2name(rt), type2name(ct));
709 } else if (rt == T_OBJECT || rt == T_ARRAY || rt == T_VALUETYPE) {
710 assert(ct == T_OBJECT || ct == T_ARRAY || ct == T_VALUETYPE, "rt=%s, ct=%s", type2name(rt), type2name(ct));
711 if (ctype->is_loaded()) {
712 const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass());
713 const Type* sig_type = TypeOopPtr::make_from_klass(ctype->as_klass());
714 if (declared_signature->returns_never_null()) {
715 assert(ct == T_VALUETYPE, "should be a value type");
716 sig_type = sig_type->join_speculative(TypePtr::NOTNULL);
717 }
718 if (arg_type != NULL && !arg_type->higher_equal(sig_type) && !peek()->is_ValueType()) {
719 Node* retnode = pop();
720 Node* cast_obj = _gvn.transform(new CheckCastPPNode(control(), retnode, sig_type));
721 push(cast_obj);
722 }
723 }
724 } else {
725 assert(rt == ct, "unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct));
726 // push a zero; it's better than getting an oop/int mismatch
727 pop_node(rt);
728 Node* retnode = zerocon(ct);
729 push_node(ct, retnode);
730 }
731 // Now that the value is well-behaved, continue with the call-site type.
732 rtype = ctype;
733 }
734 } else {
735 // Symbolic resolution enforces the types to be the same.
736 // NOTE: We must relax the assert for unloaded types because two
737 // different ciType instances of the same unloaded class type
738 // can appear to be "loaded" by different loaders (depending on
739 // the accessing class).
740 assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype,
741 "mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name());
742 }
743
744 if (rtype->basic_type() == T_VALUETYPE && !peek()->is_ValueType()) {
745 Node* retnode = pop();
746 if (!gvn().type(retnode)->maybe_null() && rtype->as_value_klass()->is_scalarizable()) {
747 retnode = ValueTypeNode::make_from_oop(this, retnode, rtype->as_value_klass());
748 }
749 push_node(T_VALUETYPE, retnode);
750 }
751
752 // If the return type of the method is not loaded, assert that the
753 // value we got is a null. Otherwise, we need to recompile.
754 if (!rtype->is_loaded()) {
755 if (PrintOpto && (Verbose || WizardMode)) {
756 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
757 cg->method()->print_name(); tty->cr();
758 }
759 if (C->log() != NULL) {
760 C->log()->elem("assert_null reason='return' klass='%d'",
761 C->log()->identify(rtype));
762 }
763 // If there is going to be a trap, put it at the next bytecode:
764 set_bci(iter().next_bci());
765 null_assert(peek());
766 set_bci(iter().cur_bci()); // put it back
767 }
768 BasicType ct = ctype->basic_type();
769 if (ct == T_OBJECT || ct == T_ARRAY) {
770 record_profiled_return_for_speculation();
771 }
772 }
773
774 // Restart record of parsing work after possible inlining of call
775 #ifndef PRODUCT
776 parse_histogram()->set_initial_state(bc());
777 #endif
778 }
779
780 //---------------------------catch_call_exceptions-----------------------------
781 // Put a Catch and CatchProj nodes behind a just-created call.
782 // Send their caught exceptions to the proper handler.
783 // This may be used after a call to the rethrow VM stub,
784 // when it is needed to process unloaded exception classes.
785 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
786 // Exceptions are delivered through this channel:
787 Node* i_o = this->i_o();
788
789 // Add a CatchNode.
790 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
791 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
792 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
793
794 bool default_handler = false;
795 for (; !handlers.is_done(); handlers.next()) {
796 ciExceptionHandler* h = handlers.handler();
797 int h_bci = h->handler_bci();
798 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
799 // Do not introduce unloaded exception types into the graph:
800 if (!h_klass->is_loaded()) {
801 if (saw_unloaded->contains(h_bci)) {
802 /* We've already seen an unloaded exception with h_bci,
803 so don't duplicate. Duplication will cause the CatchNode to be
804 unnecessarily large. See 4713716. */
805 continue;
806 } else {
807 saw_unloaded->append(h_bci);
808 }
809 }
810 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass);
811 // (We use make_from_klass because it respects UseUniqueSubclasses.)
812 h_extype = h_extype->join(TypeInstPtr::NOTNULL);
813 assert(!h_extype->empty(), "sanity");
814 // Note: It's OK if the BCIs repeat themselves.
815 bcis->append(h_bci);
816 extypes->append(h_extype);
817 if (h_bci == -1) {
818 default_handler = true;
819 }
820 }
821
822 if (!default_handler) {
823 bcis->append(-1);
824 extypes->append(TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr());
825 }
826
827 int len = bcis->length();
828 CatchNode *cn = new CatchNode(control(), i_o, len+1);
829 Node *catch_ = _gvn.transform(cn);
830
831 // now branch with the exception state to each of the (potential)
832 // handlers
833 for(int i=0; i < len; i++) {
834 // Setup JVM state to enter the handler.
835 PreserveJVMState pjvms(this);
836 // Locals are just copied from before the call.
837 // Get control from the CatchNode.
838 int handler_bci = bcis->at(i);
839 Node* ctrl = _gvn.transform( new CatchProjNode(catch_, i+1,handler_bci));
840 // This handler cannot happen?
841 if (ctrl == top()) continue;
842 set_control(ctrl);
843
844 // Create exception oop
845 const TypeInstPtr* extype = extypes->at(i)->is_instptr();
846 Node *ex_oop = _gvn.transform(new CreateExNode(extypes->at(i), ctrl, i_o));
847
848 // Handle unloaded exception classes.
849 if (saw_unloaded->contains(handler_bci)) {
850 // An unloaded exception type is coming here. Do an uncommon trap.
851 #ifndef PRODUCT
852 // We do not expect the same handler bci to take both cold unloaded
853 // and hot loaded exceptions. But, watch for it.
854 if ((Verbose || WizardMode) && extype->is_loaded()) {
855 tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci());
856 method()->print_name(); tty->cr();
857 } else if (PrintOpto && (Verbose || WizardMode)) {
858 tty->print("Bailing out on unloaded exception type ");
859 extype->klass()->print_name();
860 tty->print(" at bci:%d in ", bci());
861 method()->print_name(); tty->cr();
862 }
863 #endif
864 // Emit an uncommon trap instead of processing the block.
865 set_bci(handler_bci);
866 push_ex_oop(ex_oop);
867 uncommon_trap(Deoptimization::Reason_unloaded,
868 Deoptimization::Action_reinterpret,
869 extype->klass(), "!loaded exception");
870 set_bci(iter().cur_bci()); // put it back
871 continue;
872 }
873
874 // go to the exception handler
875 if (handler_bci < 0) { // merge with corresponding rethrow node
876 throw_to_exit(make_exception_state(ex_oop));
877 } else { // Else jump to corresponding handle
878 push_ex_oop(ex_oop); // Clear stack and push just the oop.
879 merge_exception(handler_bci);
880 }
881 }
882
883 // The first CatchProj is for the normal return.
884 // (Note: If this is a call to rethrow_Java, this node goes dead.)
885 set_control(_gvn.transform( new CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
886 }
887
888
889 //----------------------------catch_inline_exceptions--------------------------
890 // Handle all exceptions thrown by an inlined method or individual bytecode.
891 // Common case 1: we have no handler, so all exceptions merge right into
892 // the rethrow case.
893 // Case 2: we have some handlers, with loaded exception klasses that have
894 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming
895 // exception oop and branch to the handler directly.
896 // Case 3: We have some handlers with subklasses or are not loaded at
897 // compile-time. We have to call the runtime to resolve the exception.
898 // So we insert a RethrowCall and all the logic that goes with it.
899 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
900 // Caller is responsible for saving away the map for normal control flow!
901 assert(stopped(), "call set_map(NULL) first");
902 assert(method()->has_exception_handlers(), "don't come here w/o work to do");
903
904 Node* ex_node = saved_ex_oop(ex_map);
905 if (ex_node == top()) {
906 // No action needed.
907 return;
908 }
909 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
910 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
911 if (ex_type == NULL)
912 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
913
914 // determine potential exception handlers
915 ciExceptionHandlerStream handlers(method(), bci(),
916 ex_type->klass()->as_instance_klass(),
917 ex_type->klass_is_exact());
918
919 // Start executing from the given throw state. (Keep its stack, for now.)
920 // Get the exception oop as known at compile time.
921 ex_node = use_exception_state(ex_map);
922
923 // Get the exception oop klass from its header
924 Node* ex_klass_node = NULL;
925 if (has_ex_handler() && !ex_type->klass_is_exact()) {
926 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
927 ex_klass_node = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT));
928
929 // Compute the exception klass a little more cleverly.
930 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
931 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
932 // each arm of the Phi. If I know something clever about the exceptions
933 // I'm loading the class from, I can replace the LoadKlass with the
934 // klass constant for the exception oop.
935 if (ex_node->is_Phi()) {
936 ex_klass_node = new PhiNode(ex_node->in(0), TypeKlassPtr::OBJECT);
937 for (uint i = 1; i < ex_node->req(); i++) {
938 Node* ex_in = ex_node->in(i);
939 if (ex_in == top() || ex_in == NULL) {
940 // This path was not taken.
941 ex_klass_node->init_req(i, top());
942 continue;
943 }
944 Node* p = basic_plus_adr(ex_in, ex_in, oopDesc::klass_offset_in_bytes());
945 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT));
946 ex_klass_node->init_req( i, k );
947 }
948 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT);
949
950 }
951 }
952
953 // Scan the exception table for applicable handlers.
954 // If none, we can call rethrow() and be done!
955 // If precise (loaded with no subklasses), insert a D.S. style
956 // pointer compare to the correct handler and loop back.
957 // If imprecise, switch to the Rethrow VM-call style handling.
958
959 int remaining = handlers.count_remaining();
960
961 // iterate through all entries sequentially
962 for (;!handlers.is_done(); handlers.next()) {
963 ciExceptionHandler* handler = handlers.handler();
964
965 if (handler->is_rethrow()) {
966 // If we fell off the end of the table without finding an imprecise
967 // exception klass (and without finding a generic handler) then we
968 // know this exception is not handled in this method. We just rethrow
969 // the exception into the caller.
970 throw_to_exit(make_exception_state(ex_node));
971 return;
972 }
973
974 // exception handler bci range covers throw_bci => investigate further
975 int handler_bci = handler->handler_bci();
976
977 if (remaining == 1) {
978 push_ex_oop(ex_node); // Push exception oop for handler
979 if (PrintOpto && WizardMode) {
980 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
981 }
982 merge_exception(handler_bci); // jump to handler
983 return; // No more handling to be done here!
984 }
985
986 // Get the handler's klass
987 ciInstanceKlass* klass = handler->catch_klass();
988
989 if (!klass->is_loaded()) { // klass is not loaded?
990 // fall through into catch_call_exceptions which will emit a
991 // handler with an uncommon trap.
992 break;
993 }
994
995 if (klass->is_interface()) // should not happen, but...
996 break; // bail out
997
998 // Check the type of the exception against the catch type
999 const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
1000 Node* con = _gvn.makecon(tk);
1001 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
1002 if (!stopped()) {
1003 PreserveJVMState pjvms(this);
1004 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
1005 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
1006 Node* ex_oop = _gvn.transform(new CheckCastPPNode(control(), ex_node, tinst));
1007 push_ex_oop(ex_oop); // Push exception oop for handler
1008 if (PrintOpto && WizardMode) {
1009 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
1010 klass->print_name();
1011 tty->cr();
1012 }
1013 merge_exception(handler_bci);
1014 }
1015 set_control(not_subtype_ctrl);
1016
1017 // Come here if exception does not match handler.
1018 // Carry on with more handler checks.
1019 --remaining;
1020 }
1021
1022 assert(!stopped(), "you should return if you finish the chain");
1023
1024 // Oops, need to call into the VM to resolve the klasses at runtime.
1025 // Note: This call must not deoptimize, since it is not a real at this bci!
1026 kill_dead_locals();
1027
1028 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
1029 OptoRuntime::rethrow_Type(),
1030 OptoRuntime::rethrow_stub(),
1031 NULL, NULL,
1032 ex_node);
1033
1034 // Rethrow is a pure call, no side effects, only a result.
1035 // The result cannot be allocated, so we use I_O
1036
1037 // Catch exceptions from the rethrow
1038 catch_call_exceptions(handlers);
1039 }
1040
1041
1042 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.)
1043
1044
1045 #ifndef PRODUCT
1046 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
1047 if( CountCompiledCalls ) {
1048 if( at_method_entry ) {
1049 // bump invocation counter if top method (for statistics)
1050 if (CountCompiledCalls && depth() == 1) {
1051 const TypePtr* addr_type = TypeMetadataPtr::make(method());
1052 Node* adr1 = makecon(addr_type);
1053 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset()));
1054 increment_counter(adr2);
1055 }
1056 } else if (is_inline) {
1057 switch (bc()) {
1058 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
1059 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
1060 case Bytecodes::_invokestatic:
1061 case Bytecodes::_invokedynamic:
1062 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
1063 default: fatal("unexpected call bytecode");
1064 }
1065 } else {
1066 switch (bc()) {
1067 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
1068 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
1069 case Bytecodes::_invokestatic:
1070 case Bytecodes::_invokedynamic:
1071 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break;
1072 default: fatal("unexpected call bytecode");
1073 }
1074 }
1075 }
1076 }
1077 #endif //PRODUCT
1078
1079
1080 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, int bci, ciInstanceKlass* klass,
1081 ciKlass* holder, ciMethod* callee,
1082 const TypeOopPtr* receiver_type, bool is_virtual,
1083 bool& call_does_dispatch, int& vtable_index,
1084 bool check_access) {
1085 // Set default values for out-parameters.
1086 call_does_dispatch = true;
1087 vtable_index = Method::invalid_vtable_index;
1088
1089 // Choose call strategy.
1090 ciMethod* optimized_virtual_method = optimize_inlining(caller, bci, klass, callee,
1091 receiver_type, check_access);
1092
1093 // Have the call been sufficiently improved such that it is no longer a virtual?
1094 if (optimized_virtual_method != NULL) {
1095 callee = optimized_virtual_method;
1096 call_does_dispatch = false;
1097 } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) {
1098 // We can make a vtable call at this site
1099 vtable_index = callee->resolve_vtable_index(caller->holder(), holder);
1100 }
1101 return callee;
1102 }
1103
1104 // Identify possible target method and inlining style
1105 ciMethod* Compile::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass,
1106 ciMethod* callee, const TypeOopPtr* receiver_type,
1107 bool check_access) {
1108 // only use for virtual or interface calls
1109
1110 // If it is obviously final, do not bother to call find_monomorphic_target,
1111 // because the class hierarchy checks are not needed, and may fail due to
1112 // incompletely loaded classes. Since we do our own class loading checks
1113 // in this module, we may confidently bind to any method.
1114 if (callee->can_be_statically_bound()) {
1115 return callee;
1116 }
1117
1118 // Attempt to improve the receiver
1119 bool actual_receiver_is_exact = false;
1120 ciInstanceKlass* actual_receiver = klass;
1121 if (receiver_type != NULL) {
1122 // Array methods are all inherited from Object, and are monomorphic.
1123 // finalize() call on array is not allowed.
1124 if (receiver_type->isa_aryptr() &&
1125 callee->holder() == env()->Object_klass() &&
1126 callee->name() != ciSymbol::finalize_method_name()) {
1127 return callee;
1128 }
1129
1130 // All other interesting cases are instance klasses.
1131 if (!receiver_type->isa_instptr()) {
1132 return NULL;
1133 }
1134
1135 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass();
1136 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() &&
1137 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) {
1138 // ikl is a same or better type than the original actual_receiver,
1139 // e.g. static receiver from bytecodes.
1140 actual_receiver = ikl;
1141 // Is the actual_receiver exact?
1142 actual_receiver_is_exact = receiver_type->klass_is_exact();
1143 }
1144 }
1145
1146 ciInstanceKlass* calling_klass = caller->holder();
1147 ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver, check_access);
1148 if (cha_monomorphic_target != NULL) {
1149 assert(!cha_monomorphic_target->is_abstract(), "");
1150 // Look at the method-receiver type. Does it add "too much information"?
1151 ciKlass* mr_klass = cha_monomorphic_target->holder();
1152 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass);
1153 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) {
1154 // Calling this method would include an implicit cast to its holder.
1155 // %%% Not yet implemented. Would throw minor asserts at present.
1156 // %%% The most common wins are already gained by +UseUniqueSubclasses.
1157 // To fix, put the higher_equal check at the call of this routine,
1158 // and add a CheckCastPP to the receiver.
1159 if (TraceDependencies) {
1160 tty->print_cr("found unique CHA method, but could not cast up");
1161 tty->print(" method = ");
1162 cha_monomorphic_target->print();
1163 tty->cr();
1164 }
1165 if (log() != NULL) {
1166 log()->elem("missed_CHA_opportunity klass='%d' method='%d'",
1167 log()->identify(klass),
1168 log()->identify(cha_monomorphic_target));
1169 }
1170 cha_monomorphic_target = NULL;
1171 }
1172 }
1173 if (cha_monomorphic_target != NULL) {
1174 // Hardwiring a virtual.
1175 // If we inlined because CHA revealed only a single target method,
1176 // then we are dependent on that target method not getting overridden
1177 // by dynamic class loading. Be sure to test the "static" receiver
1178 // dest_method here, as opposed to the actual receiver, which may
1179 // falsely lead us to believe that the receiver is final or private.
1180 dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target);
1181 return cha_monomorphic_target;
1182 }
1183
1184 // If the type is exact, we can still bind the method w/o a vcall.
1185 // (This case comes after CHA so we can see how much extra work it does.)
1186 if (actual_receiver_is_exact) {
1187 // In case of evolution, there is a dependence on every inlined method, since each
1188 // such method can be changed when its class is redefined.
1189 ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver);
1190 if (exact_method != NULL) {
1191 if (PrintOpto) {
1192 tty->print(" Calling method via exact type @%d --- ", bci);
1193 exact_method->print_name();
1194 tty->cr();
1195 }
1196 return exact_method;
1197 }
1198 }
1199
1200 return NULL;
1201 }