1 /*
2 * Copyright (c) 1998, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/ciCallSite.hpp"
27 #include "ci/ciMethodHandle.hpp"
28 #include "ci/ciSymbols.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "compiler/compileLog.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "opto/addnode.hpp"
34 #include "opto/callGenerator.hpp"
35 #include "opto/castnode.hpp"
36 #include "opto/cfgnode.hpp"
37 #include "opto/inlinetypenode.hpp"
38 #include "opto/mulnode.hpp"
39 #include "opto/parse.hpp"
40 #include "opto/rootnode.hpp"
41 #include "opto/runtime.hpp"
42 #include "opto/subnode.hpp"
43 #include "prims/methodHandles.hpp"
44 #include "runtime/sharedRuntime.hpp"
45 #include "utilities/macros.hpp"
46 #if INCLUDE_JFR
47 #include "jfr/jfr.hpp"
48 #endif
49
50 void trace_type_profile(Compile* C, ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) {
51 if (TraceTypeProfile || C->print_inlining()) {
52 outputStream* out = tty;
53 if (!C->print_inlining()) {
54 if (!PrintOpto && !PrintCompilation) {
55 method->print_short_name();
56 tty->cr();
57 }
58 CompileTask::print_inlining_tty(prof_method, depth, bci);
59 } else {
60 out = C->print_inlining_stream();
61 }
62 CompileTask::print_inline_indent(depth, out);
63 out->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count);
64 stringStream ss;
65 prof_klass->name()->print_symbol_on(&ss);
66 out->print("%s", ss.freeze());
67 out->cr();
68 }
69 }
70
71 CallGenerator* Compile::call_generator(ciMethod* callee, int vtable_index, bool call_does_dispatch,
72 JVMState* jvms, bool allow_inline,
73 float prof_factor, ciKlass* speculative_receiver_type,
74 bool allow_intrinsics) {
75 assert(callee != NULL, "failed method resolution");
76
77 ciMethod* caller = jvms->method();
78 int bci = jvms->bci();
79 Bytecodes::Code bytecode = caller->java_code_at_bci(bci);
80 ciMethod* orig_callee = caller->get_method_at_bci(bci);
81
82 const bool is_virtual_or_interface = (bytecode == Bytecodes::_invokevirtual) ||
83 (bytecode == Bytecodes::_invokeinterface) ||
84 (orig_callee->intrinsic_id() == vmIntrinsics::_linkToVirtual) ||
85 (orig_callee->intrinsic_id() == vmIntrinsics::_linkToInterface);
86
87 // Dtrace currently doesn't work unless all calls are vanilla
88 if (env()->dtrace_method_probes()) {
89 allow_inline = false;
90 }
91
92 // Note: When we get profiling during stage-1 compiles, we want to pull
93 // from more specific profile data which pertains to this inlining.
94 // Right now, ignore the information in jvms->caller(), and do method[bci].
95 ciCallProfile profile = caller->call_profile_at_bci(bci);
96
97 // See how many times this site has been invoked.
98 int site_count = profile.count();
99 int receiver_count = -1;
100 if (call_does_dispatch && UseTypeProfile && profile.has_receiver(0)) {
101 // Receivers in the profile structure are ordered by call counts
102 // so that the most called (major) receiver is profile.receiver(0).
103 receiver_count = profile.receiver_count(0);
104 }
105
106 CompileLog* log = this->log();
107 if (log != NULL) {
108 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
109 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1;
110 log->begin_elem("call method='%d' count='%d' prof_factor='%f'",
111 log->identify(callee), site_count, prof_factor);
112 if (call_does_dispatch) log->print(" virtual='1'");
113 if (allow_inline) log->print(" inline='1'");
114 if (receiver_count >= 0) {
115 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
116 if (profile.has_receiver(1)) {
117 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
118 }
119 }
120 if (callee->is_method_handle_intrinsic()) {
121 log->print(" method_handle_intrinsic='1'");
122 }
123 log->end_elem();
124 }
125
126 // Special case the handling of certain common, profitable library
127 // methods. If these methods are replaced with specialized code,
128 // then we return it as the inlined version of the call.
129 CallGenerator* cg_intrinsic = NULL;
130 if (allow_inline && allow_intrinsics) {
131 CallGenerator* cg = find_intrinsic(callee, call_does_dispatch);
132 if (cg != NULL) {
133 if (cg->is_predicated()) {
134 // Code without intrinsic but, hopefully, inlined.
135 CallGenerator* inline_cg = this->call_generator(callee,
136 vtable_index, call_does_dispatch, jvms, allow_inline, prof_factor, speculative_receiver_type, false);
137 if (inline_cg != NULL) {
138 cg = CallGenerator::for_predicated_intrinsic(cg, inline_cg);
139 }
140 }
141
142 // If intrinsic does the virtual dispatch, we try to use the type profile
143 // first, and hopefully inline it as the regular virtual call below.
144 // We will retry the intrinsic if nothing had claimed it afterwards.
145 if (cg->does_virtual_dispatch()) {
146 cg_intrinsic = cg;
147 cg = NULL;
148 } else if (IncrementalInline && should_delay_vector_inlining(callee, jvms)) {
149 return CallGenerator::for_late_inline(callee, cg);
150 } else {
151 return cg;
152 }
153 }
154 }
155
156 // Do method handle calls.
157 // NOTE: This must happen before normal inlining logic below since
158 // MethodHandle.invoke* are native methods which obviously don't
159 // have bytecodes and so normal inlining fails.
160 if (callee->is_method_handle_intrinsic()) {
161 CallGenerator* cg = CallGenerator::for_method_handle_call(jvms, caller, callee, allow_inline);
162 return cg;
163 }
164
165 // Attempt to inline...
166 if (allow_inline) {
167 // The profile data is only partly attributable to this caller,
168 // scale back the call site information.
169 float past_uses = jvms->method()->scale_count(site_count, prof_factor);
170 // This is the number of times we expect the call code to be used.
171 float expected_uses = past_uses;
172
173 // Try inlining a bytecoded method:
174 if (!call_does_dispatch) {
175 InlineTree* ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
176 bool should_delay = AlwaysIncrementalInline;
177 if (ilt->ok_to_inline(callee, jvms, profile, should_delay)) {
178 CallGenerator* cg = CallGenerator::for_inline(callee, expected_uses);
179 // For optimized virtual calls assert at runtime that receiver object
180 // is a subtype of the inlined method holder. CHA can report a method
181 // as a unique target under an abstract method, but receiver type
182 // sometimes has a broader type. Similar scenario is possible with
183 // default methods when type system loses information about implemented
184 // interfaces.
185 if (cg != NULL && is_virtual_or_interface && !callee->is_static()) {
186 CallGenerator* trap_cg = CallGenerator::for_uncommon_trap(callee,
187 Deoptimization::Reason_receiver_constraint, Deoptimization::Action_none);
188
189 cg = CallGenerator::for_guarded_call(callee->holder(), trap_cg, cg);
190 }
191 if (cg != NULL) {
192 // Delay the inlining of this method to give us the
193 // opportunity to perform some high level optimizations
194 // first.
195 if (should_delay_string_inlining(callee, jvms)) {
196 return CallGenerator::for_string_late_inline(callee, cg);
197 } else if (should_delay_boxing_inlining(callee, jvms)) {
198 return CallGenerator::for_boxing_late_inline(callee, cg);
199 } else if (should_delay_vector_reboxing_inlining(callee, jvms)) {
200 return CallGenerator::for_vector_reboxing_late_inline(callee, cg);
201 } else if (should_delay) {
202 return CallGenerator::for_late_inline(callee, cg);
203 } else {
204 return cg;
205 }
206 }
207 }
208 }
209
210 // Try using the type profile.
211 if (call_does_dispatch && site_count > 0 && UseTypeProfile) {
212 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
213 bool have_major_receiver = profile.has_receiver(0) && (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
214 ciMethod* receiver_method = NULL;
215
216 int morphism = profile.morphism();
217 if (speculative_receiver_type != NULL) {
218 if (!too_many_traps_or_recompiles(caller, bci, Deoptimization::Reason_speculate_class_check)) {
219 // We have a speculative type, we should be able to resolve
220 // the call. We do that before looking at the profiling at
221 // this invoke because it may lead to bimorphic inlining which
222 // a speculative type should help us avoid.
223 receiver_method = callee->resolve_invoke(jvms->method()->holder(),
224 speculative_receiver_type);
225 if (receiver_method == NULL) {
226 speculative_receiver_type = NULL;
227 } else {
228 morphism = 1;
229 }
230 } else {
231 // speculation failed before. Use profiling at the call
232 // (could allow bimorphic inlining for instance).
233 speculative_receiver_type = NULL;
234 }
235 }
236 if (receiver_method == NULL &&
237 (have_major_receiver || morphism == 1 ||
238 (morphism == 2 && UseBimorphicInlining))) {
239 // receiver_method = profile.method();
240 // Profiles do not suggest methods now. Look it up in the major receiver.
241 receiver_method = callee->resolve_invoke(jvms->method()->holder(),
242 profile.receiver(0));
243 }
244 if (receiver_method != NULL) {
245 // The single majority receiver sufficiently outweighs the minority.
246 CallGenerator* hit_cg = this->call_generator(receiver_method,
247 vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
248 if (hit_cg != NULL) {
249 // Look up second receiver.
250 CallGenerator* next_hit_cg = NULL;
251 ciMethod* next_receiver_method = NULL;
252 if (morphism == 2 && UseBimorphicInlining) {
253 next_receiver_method = callee->resolve_invoke(jvms->method()->holder(),
254 profile.receiver(1));
255 if (next_receiver_method != NULL) {
256 next_hit_cg = this->call_generator(next_receiver_method,
257 vtable_index, !call_does_dispatch, jvms,
258 allow_inline, prof_factor);
259 if (next_hit_cg != NULL && !next_hit_cg->is_inline() &&
260 have_major_receiver && UseOnlyInlinedBimorphic) {
261 // Skip if we can't inline second receiver's method
262 next_hit_cg = NULL;
263 }
264 }
265 }
266 CallGenerator* miss_cg;
267 Deoptimization::DeoptReason reason = (morphism == 2
268 ? Deoptimization::Reason_bimorphic
269 : Deoptimization::reason_class_check(speculative_receiver_type != NULL));
270 if ((morphism == 1 || (morphism == 2 && next_hit_cg != NULL)) &&
271 !too_many_traps_or_recompiles(caller, bci, reason)
272 ) {
273 // Generate uncommon trap for class check failure path
274 // in case of monomorphic or bimorphic virtual call site.
275 miss_cg = CallGenerator::for_uncommon_trap(callee, reason,
276 Deoptimization::Action_maybe_recompile);
277 } else {
278 // Generate virtual call for class check failure path
279 // in case of polymorphic virtual call site.
280 miss_cg = (IncrementalInlineVirtual ? CallGenerator::for_late_inline_virtual(callee, vtable_index, prof_factor)
281 : CallGenerator::for_virtual_call(callee, vtable_index));
282 }
283 if (miss_cg != NULL) {
284 if (next_hit_cg != NULL) {
285 assert(speculative_receiver_type == NULL, "shouldn't end up here if we used speculation");
286 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1));
287 // We don't need to record dependency on a receiver here and below.
288 // Whenever we inline, the dependency is added by Parse::Parse().
289 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
290 }
291 if (miss_cg != NULL) {
292 ciKlass* k = speculative_receiver_type != NULL ? speculative_receiver_type : profile.receiver(0);
293 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, k, site_count, receiver_count);
294 float hit_prob = speculative_receiver_type != NULL ? 1.0 : profile.receiver_prob(0);
295 CallGenerator* cg = CallGenerator::for_predicted_call(k, miss_cg, hit_cg, hit_prob);
296 if (cg != NULL) return cg;
297 }
298 }
299 }
300 }
301 }
302
303 // If there is only one implementor of this interface then we
304 // may be able to bind this invoke directly to the implementing
305 // klass but we need both a dependence on the single interface
306 // and on the method we bind to. Additionally since all we know
307 // about the receiver type is that it's supposed to implement the
308 // interface we have to insert a check that it's the class we
309 // expect. Interface types are not checked by the verifier so
310 // they are roughly equivalent to Object.
311 // The number of implementors for declared_interface is less or
312 // equal to the number of implementors for target->holder() so
313 // if number of implementors of target->holder() == 1 then
314 // number of implementors for decl_interface is 0 or 1. If
315 // it's 0 then no class implements decl_interface and there's
316 // no point in inlining.
317 if (call_does_dispatch && bytecode == Bytecodes::_invokeinterface) {
318 ciInstanceKlass* declared_interface =
319 caller->get_declared_method_holder_at_bci(bci)->as_instance_klass();
320 ciInstanceKlass* singleton = declared_interface->unique_implementor();
321
322 if (singleton != NULL) {
323 assert(singleton != declared_interface, "not a unique implementor");
324
325 ciMethod* cha_monomorphic_target =
326 callee->find_monomorphic_target(caller->holder(), declared_interface, singleton);
327
328 if (cha_monomorphic_target != NULL &&
329 cha_monomorphic_target->holder() != env()->Object_klass()) { // subtype check against Object is useless
330 ciKlass* holder = cha_monomorphic_target->holder();
331
332 // Try to inline the method found by CHA. Inlined method is guarded by the type check.
333 CallGenerator* hit_cg = call_generator(cha_monomorphic_target,
334 vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
335
336 // Deoptimize on type check fail. The interpreter will throw ICCE for us.
337 CallGenerator* miss_cg = CallGenerator::for_uncommon_trap(callee,
338 Deoptimization::Reason_class_check, Deoptimization::Action_none);
339
340 ciKlass* constraint = (holder->is_subclass_of(singleton) ? holder : singleton); // avoid upcasts
341 CallGenerator* cg = CallGenerator::for_guarded_call(constraint, miss_cg, hit_cg);
342 if (hit_cg != NULL && cg != NULL) {
343 dependencies()->assert_unique_implementor(declared_interface, singleton);
344 dependencies()->assert_unique_concrete_method(declared_interface, cha_monomorphic_target, declared_interface, callee);
345 return cg;
346 }
347 }
348 }
349 } // call_does_dispatch && bytecode == Bytecodes::_invokeinterface
350
351 // Nothing claimed the intrinsic, we go with straight-forward inlining
352 // for already discovered intrinsic.
353 if (allow_intrinsics && cg_intrinsic != NULL) {
354 assert(cg_intrinsic->does_virtual_dispatch(), "sanity");
355 return cg_intrinsic;
356 }
357 } // allow_inline
358
359 // There was no special inlining tactic, or it bailed out.
360 // Use a more generic tactic, like a simple call.
361 if (call_does_dispatch) {
362 const char* msg = "virtual call";
363 if (C->print_inlining()) {
364 print_inlining(callee, jvms->depth() - 1, jvms->bci(), msg);
365 }
366 C->log_inline_failure(msg);
367 if (IncrementalInlineVirtual && allow_inline) {
368 return CallGenerator::for_late_inline_virtual(callee, vtable_index, prof_factor); // attempt to inline through virtual call later
369 } else {
370 return CallGenerator::for_virtual_call(callee, vtable_index);
371 }
372 } else {
373 // Class Hierarchy Analysis or Type Profile reveals a unique target, or it is a static or special call.
374 CallGenerator* cg = CallGenerator::for_direct_call(callee, should_delay_inlining(callee, jvms));
375 // For optimized virtual calls assert at runtime that receiver object
376 // is a subtype of the method holder.
377 if (cg != NULL && is_virtual_or_interface && !callee->is_static()) {
378 CallGenerator* trap_cg = CallGenerator::for_uncommon_trap(callee,
379 Deoptimization::Reason_receiver_constraint, Deoptimization::Action_none);
380 cg = CallGenerator::for_guarded_call(callee->holder(), trap_cg, cg);
381 }
382 return cg;
383 }
384 }
385
386 // Return true for methods that shouldn't be inlined early so that
387 // they are easier to analyze and optimize as intrinsics.
388 bool Compile::should_delay_string_inlining(ciMethod* call_method, JVMState* jvms) {
389 if (has_stringbuilder()) {
390
391 if ((call_method->holder() == C->env()->StringBuilder_klass() ||
392 call_method->holder() == C->env()->StringBuffer_klass()) &&
393 (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
394 jvms->method()->holder() == C->env()->StringBuffer_klass())) {
395 // Delay SB calls only when called from non-SB code
396 return false;
397 }
398
399 switch (call_method->intrinsic_id()) {
400 case vmIntrinsics::_StringBuilder_void:
401 case vmIntrinsics::_StringBuilder_int:
402 case vmIntrinsics::_StringBuilder_String:
403 case vmIntrinsics::_StringBuilder_append_char:
404 case vmIntrinsics::_StringBuilder_append_int:
405 case vmIntrinsics::_StringBuilder_append_String:
406 case vmIntrinsics::_StringBuilder_toString:
407 case vmIntrinsics::_StringBuffer_void:
408 case vmIntrinsics::_StringBuffer_int:
409 case vmIntrinsics::_StringBuffer_String:
410 case vmIntrinsics::_StringBuffer_append_char:
411 case vmIntrinsics::_StringBuffer_append_int:
412 case vmIntrinsics::_StringBuffer_append_String:
413 case vmIntrinsics::_StringBuffer_toString:
414 case vmIntrinsics::_Integer_toString:
415 return true;
416
417 case vmIntrinsics::_String_String:
418 {
419 Node* receiver = jvms->map()->in(jvms->argoff() + 1);
420 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
421 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
422 ciMethod* m = csj->method();
423 if (m != NULL &&
424 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
425 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
426 // Delay String.<init>(new SB())
427 return true;
428 }
429 return false;
430 }
431
432 default:
433 return false;
434 }
435 }
436 return false;
437 }
438
439 bool Compile::should_delay_boxing_inlining(ciMethod* call_method, JVMState* jvms) {
440 if (eliminate_boxing() && call_method->is_boxing_method()) {
441 set_has_boxed_value(true);
442 return aggressive_unboxing();
443 }
444 return false;
445 }
446
447 bool Compile::should_delay_vector_inlining(ciMethod* call_method, JVMState* jvms) {
448 return EnableVectorSupport && call_method->is_vector_method();
449 }
450
451 bool Compile::should_delay_vector_reboxing_inlining(ciMethod* call_method, JVMState* jvms) {
452 return EnableVectorSupport && (call_method->intrinsic_id() == vmIntrinsics::_VectorRebox);
453 }
454
455 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
456 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
457 // Additional inputs to consider...
458 // bc = bc()
459 // caller = method()
460 // iter().get_method_holder_index()
461 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
462 // Interface classes can be loaded & linked and never get around to
463 // being initialized. Uncommon-trap for not-initialized static or
464 // v-calls. Let interface calls happen.
465 ciInstanceKlass* holder_klass = dest_method->holder();
466 if (!holder_klass->is_being_initialized() &&
467 !holder_klass->is_initialized() &&
468 !holder_klass->is_interface()) {
469 uncommon_trap(Deoptimization::Reason_uninitialized,
470 Deoptimization::Action_reinterpret,
471 holder_klass);
472 return true;
473 }
474
475 assert(dest_method->is_loaded(), "dest_method: typeflow responsibility");
476 return false;
477 }
478
479 #ifdef ASSERT
480 static bool check_call_consistency(JVMState* jvms, CallGenerator* cg) {
481 ciMethod* symbolic_info = jvms->method()->get_method_at_bci(jvms->bci());
482 ciMethod* resolved_method = cg->method();
483 if (!ciMethod::is_consistent_info(symbolic_info, resolved_method)) {
484 tty->print_cr("JVMS:");
485 jvms->dump();
486 tty->print_cr("Bytecode info:");
487 jvms->method()->get_method_at_bci(jvms->bci())->print(); tty->cr();
488 tty->print_cr("Resolved method:");
489 cg->method()->print(); tty->cr();
490 return false;
491 }
492 return true;
493 }
494 #endif // ASSERT
495
496 //------------------------------do_call----------------------------------------
497 // Handle your basic call. Inline if we can & want to, else just setup call.
498 void Parse::do_call() {
499 // It's likely we are going to add debug info soon.
500 // Also, if we inline a guy who eventually needs debug info for this JVMS,
501 // our contribution to it is cleaned up right here.
502 kill_dead_locals();
503
504 C->print_inlining_assert_ready();
505
506 // Set frequently used booleans
507 const bool is_virtual = bc() == Bytecodes::_invokevirtual;
508 const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
509 const bool has_receiver = Bytecodes::has_receiver(bc());
510
511 // Find target being called
512 bool will_link;
513 ciSignature* declared_signature = NULL;
514 ciMethod* orig_callee = iter().get_method(will_link, &declared_signature); // callee in the bytecode
515 ciInstanceKlass* holder_klass = orig_callee->holder();
516 ciKlass* holder = iter().get_declared_method_holder();
517 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
518 assert(declared_signature != NULL, "cannot be null");
519 JFR_ONLY(Jfr::on_resolution(this, holder, orig_callee);)
520
521 // Bump max node limit for JSR292 users
522 if (bc() == Bytecodes::_invokedynamic || orig_callee->is_method_handle_intrinsic()) {
523 C->set_max_node_limit(3*MaxNodeLimit);
524 }
525
526 // uncommon-trap when callee is unloaded, uninitialized or will not link
527 // bailout when too many arguments for register representation
528 if (!will_link || can_not_compile_call_site(orig_callee, klass)) {
529 if (PrintOpto && (Verbose || WizardMode)) {
530 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
531 orig_callee->print_name(); tty->cr();
532 }
533 return;
534 }
535 assert(holder_klass->is_loaded(), "");
536 //assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); // XXX invokehandle (cur_bc_raw)
537 // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
538 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
539 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
540 // Note: In the absence of miranda methods, an abstract class K can perform
541 // an invokevirtual directly on an interface method I.m if K implements I.
542
543 // orig_callee is the resolved callee which's signature includes the
544 // appendix argument.
545 const int nargs = orig_callee->arg_size();
546 const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id());
547
548 // Push appendix argument (MethodType, CallSite, etc.), if one.
549 if (iter().has_appendix()) {
550 ciObject* appendix_arg = iter().get_appendix();
551 const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg, /* require_const= */ true);
552 Node* appendix_arg_node = _gvn.makecon(appendix_arg_type);
553 push(appendix_arg_node);
554 }
555
556 // ---------------------
557 // Does Class Hierarchy Analysis reveal only a single target of a v-call?
558 // Then we may inline or make a static call, but become dependent on there being only 1 target.
559 // Does the call-site type profile reveal only one receiver?
560 // Then we may introduce a run-time check and inline on the path where it succeeds.
561 // The other path may uncommon_trap, check for another receiver, or do a v-call.
562
563 // Try to get the most accurate receiver type
564 ciMethod* callee = orig_callee;
565 int vtable_index = Method::invalid_vtable_index;
566 bool call_does_dispatch = false;
567
568 // Speculative type of the receiver if any
569 ciKlass* speculative_receiver_type = NULL;
570 if (is_virtual_or_interface) {
571 Node* receiver_node = stack(sp() - nargs);
572 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
573 // call_does_dispatch and vtable_index are out-parameters. They might be changed.
574 // For arrays, klass below is Object. When vtable calls are used,
575 // resolving the call with Object would allow an illegal call to
576 // finalize() on an array. We use holder instead: illegal calls to
577 // finalize() won't be compiled as vtable calls (IC call
578 // resolution will catch the illegal call) and the few legal calls
579 // on array types won't be either.
580 callee = C->optimize_virtual_call(method(), klass, holder, orig_callee,
581 receiver_type, is_virtual,
582 call_does_dispatch, vtable_index); // out-parameters
583 speculative_receiver_type = receiver_type != NULL ? receiver_type->speculative_type() : NULL;
584 }
585
586 // Additional receiver subtype checks for interface calls via invokespecial or invokeinterface.
587 ciKlass* receiver_constraint = NULL;
588 if (iter().cur_bc_raw() == Bytecodes::_invokespecial && !orig_callee->is_object_constructor()) {
589 ciInstanceKlass* calling_klass = method()->holder();
590 ciInstanceKlass* sender_klass = calling_klass;
591 if (sender_klass->is_interface()) {
592 receiver_constraint = sender_klass;
593 }
594 } else if (iter().cur_bc_raw() == Bytecodes::_invokeinterface && orig_callee->is_private()) {
595 assert(holder->is_interface(), "How did we get a non-interface method here!");
596 receiver_constraint = holder;
597 }
598
599 if (receiver_constraint != NULL) {
600 Node* receiver_node = stack(sp() - nargs);
601 Node* cls_node = makecon(TypeKlassPtr::make(receiver_constraint, Type::trust_interfaces));
602 Node* bad_type_ctrl = NULL;
603 Node* casted_receiver = gen_checkcast(receiver_node, cls_node, &bad_type_ctrl);
604 if (bad_type_ctrl != NULL) {
605 PreserveJVMState pjvms(this);
606 set_control(bad_type_ctrl);
607 uncommon_trap(Deoptimization::Reason_class_check,
608 Deoptimization::Action_none);
609 }
610 if (stopped()) {
611 return; // MUST uncommon-trap?
612 }
613 set_stack(sp() - nargs, casted_receiver);
614 }
615
616 // Note: It's OK to try to inline a virtual call.
617 // The call generator will not attempt to inline a polymorphic call
618 // unless it knows how to optimize the receiver dispatch.
619 bool try_inline = (C->do_inlining() || InlineAccessors);
620
621 // ---------------------
622 dec_sp(nargs); // Temporarily pop args for JVM state of call
623 JVMState* jvms = sync_jvms();
624
625 // ---------------------
626 // Decide call tactic.
627 // This call checks with CHA, the interpreter profile, intrinsics table, etc.
628 // It decides whether inlining is desirable or not.
629 CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type);
630
631 // NOTE: Don't use orig_callee and callee after this point! Use cg->method() instead.
632 orig_callee = callee = NULL;
633
634 // ---------------------
635 // Round double arguments before call
636 round_double_arguments(cg->method());
637
638 // Feed profiling data for arguments to the type system so it can
639 // propagate it as speculative types
640 record_profiled_arguments_for_speculation(cg->method(), bc());
641
642 #ifndef PRODUCT
643 // bump global counters for calls
644 count_compiled_calls(/*at_method_entry*/ false, cg->is_inline());
645
646 // Record first part of parsing work for this call
647 parse_histogram()->record_change();
648 #endif // not PRODUCT
649
650 assert(jvms == this->jvms(), "still operating on the right JVMS");
651 assert(jvms_in_sync(), "jvms must carry full info into CG");
652
653 // save across call, for a subsequent cast_not_null.
654 Node* receiver = has_receiver ? argument(0) : NULL;
655
656 // The extra CheckCastPPs for speculative types mess with PhaseStringOpts
657 if (receiver != NULL && !call_does_dispatch && !cg->is_string_late_inline()) {
658 // Feed profiling data for a single receiver to the type system so
659 // it can propagate it as a speculative type
660 receiver = record_profiled_receiver_for_speculation(receiver);
661 }
662
663 JVMState* new_jvms = cg->generate(jvms);
664 if (new_jvms == NULL) {
665 // When inlining attempt fails (e.g., too many arguments),
666 // it may contaminate the current compile state, making it
667 // impossible to pull back and try again. Once we call
668 // cg->generate(), we are committed. If it fails, the whole
669 // compilation task is compromised.
670 if (failing()) return;
671
672 // This can happen if a library intrinsic is available, but refuses
673 // the call site, perhaps because it did not match a pattern the
674 // intrinsic was expecting to optimize. Should always be possible to
675 // get a normal java call that may inline in that case
676 cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type, /* allow_intrinsics= */ false);
677 new_jvms = cg->generate(jvms);
678 if (new_jvms == NULL) {
679 guarantee(failing(), "call failed to generate: calls should work");
680 return;
681 }
682 }
683
684 if (cg->is_inline()) {
685 // Accumulate has_loops estimate
686 C->env()->notice_inlined_method(cg->method());
687 }
688
689 // Reset parser state from [new_]jvms, which now carries results of the call.
690 // Return value (if any) is already pushed on the stack by the cg.
691 add_exception_states_from(new_jvms);
692 if (new_jvms->map()->control() == top()) {
693 stop_and_kill_map();
694 } else {
695 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
696 set_jvms(new_jvms);
697 }
698
699 assert(check_call_consistency(jvms, cg), "inconsistent info");
700
701 if (!stopped()) {
702 // This was some sort of virtual call, which did a null check for us.
703 // Now we can assert receiver-not-null, on the normal return path.
704 if (receiver != NULL && cg->is_virtual()) {
705 Node* cast = cast_not_null(receiver);
706 // %%% assert(receiver == cast, "should already have cast the receiver");
707 }
708
709 ciType* rtype = cg->method()->return_type();
710 ciType* ctype = declared_signature->return_type();
711
712 if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) {
713 // Be careful here with return types.
714 if (ctype != rtype) {
715 BasicType rt = rtype->basic_type();
716 BasicType ct = ctype->basic_type();
717 if (ct == T_VOID) {
718 // It's OK for a method to return a value that is discarded.
719 // The discarding does not require any special action from the caller.
720 // The Java code knows this, at VerifyType.isNullConversion.
721 pop_node(rt); // whatever it was, pop it
722 } else if (rt == T_INT || is_subword_type(rt)) {
723 // Nothing. These cases are handled in lambda form bytecode.
724 assert(ct == T_INT || is_subword_type(ct), "must match: rt=%s, ct=%s", type2name(rt), type2name(ct));
725 } else if (is_reference_type(rt)) {
726 assert(is_reference_type(ct), "rt=%s, ct=%s", type2name(rt), type2name(ct));
727 if (ctype->is_loaded()) {
728 const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass());
729 const Type* sig_type = TypeOopPtr::make_from_klass(ctype->as_klass());
730 if (declared_signature->returns_null_free_inline_type()) {
731 sig_type = sig_type->join_speculative(TypePtr::NOTNULL);
732 }
733 if (arg_type != NULL && !arg_type->higher_equal(sig_type)) {
734 Node* retnode = pop();
735 Node* cast_obj = _gvn.transform(new CheckCastPPNode(control(), retnode, sig_type));
736 push(cast_obj);
737 }
738 }
739 } else {
740 assert(rt == ct, "unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct));
741 // push a zero; it's better than getting an oop/int mismatch
742 pop_node(rt);
743 Node* retnode = zerocon(ct);
744 push_node(ct, retnode);
745 }
746 // Now that the value is well-behaved, continue with the call-site type.
747 rtype = ctype;
748 }
749 } else {
750 // Symbolic resolution enforces the types to be the same.
751 // NOTE: We must relax the assert for unloaded types because two
752 // different ciType instances of the same unloaded class type
753 // can appear to be "loaded" by different loaders (depending on
754 // the accessing class).
755 assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype,
756 "mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name());
757 }
758
759 // If the return type of the method is not loaded, assert that the
760 // value we got is a null. Otherwise, we need to recompile.
761 if (!rtype->is_loaded()) {
762 if (PrintOpto && (Verbose || WizardMode)) {
763 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
764 cg->method()->print_name(); tty->cr();
765 }
766 if (C->log() != NULL) {
767 C->log()->elem("assert_null reason='return' klass='%d'",
768 C->log()->identify(rtype));
769 }
770 // If there is going to be a trap, put it at the next bytecode:
771 set_bci(iter().next_bci());
772 null_assert(peek());
773 set_bci(iter().cur_bci()); // put it back
774 }
775 BasicType ct = ctype->basic_type();
776 if (is_reference_type(ct)) {
777 record_profiled_return_for_speculation();
778 }
779 if (rtype->basic_type() == T_PRIMITIVE_OBJECT && !peek()->is_InlineType()) {
780 Node* retnode = pop();
781 retnode = InlineTypeNode::make_from_oop(this, retnode, rtype->as_inline_klass(), !gvn().type(retnode)->maybe_null());
782 push_node(T_PRIMITIVE_OBJECT, retnode);
783 }
784 }
785
786 // Restart record of parsing work after possible inlining of call
787 #ifndef PRODUCT
788 parse_histogram()->set_initial_state(bc());
789 #endif
790 }
791
792 //---------------------------catch_call_exceptions-----------------------------
793 // Put a Catch and CatchProj nodes behind a just-created call.
794 // Send their caught exceptions to the proper handler.
795 // This may be used after a call to the rethrow VM stub,
796 // when it is needed to process unloaded exception classes.
797 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
798 // Exceptions are delivered through this channel:
799 Node* i_o = this->i_o();
800
801 // Add a CatchNode.
802 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
803 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
804 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
805
806 bool default_handler = false;
807 for (; !handlers.is_done(); handlers.next()) {
808 ciExceptionHandler* h = handlers.handler();
809 int h_bci = h->handler_bci();
810 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
811 // Do not introduce unloaded exception types into the graph:
812 if (!h_klass->is_loaded()) {
813 if (saw_unloaded->contains(h_bci)) {
814 /* We've already seen an unloaded exception with h_bci,
815 so don't duplicate. Duplication will cause the CatchNode to be
816 unnecessarily large. See 4713716. */
817 continue;
818 } else {
819 saw_unloaded->append(h_bci);
820 }
821 }
822 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass);
823 // (We use make_from_klass because it respects UseUniqueSubclasses.)
824 h_extype = h_extype->join(TypeInstPtr::NOTNULL);
825 assert(!h_extype->empty(), "sanity");
826 // Note: It's OK if the BCIs repeat themselves.
827 bcis->append(h_bci);
828 extypes->append(h_extype);
829 if (h_bci == -1) {
830 default_handler = true;
831 }
832 }
833
834 if (!default_handler) {
835 bcis->append(-1);
836 extypes->append(TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr());
837 }
838
839 int len = bcis->length();
840 CatchNode *cn = new CatchNode(control(), i_o, len+1);
841 Node *catch_ = _gvn.transform(cn);
842
843 // now branch with the exception state to each of the (potential)
844 // handlers
845 for(int i=0; i < len; i++) {
846 // Setup JVM state to enter the handler.
847 PreserveJVMState pjvms(this);
848 // Locals are just copied from before the call.
849 // Get control from the CatchNode.
850 int handler_bci = bcis->at(i);
851 Node* ctrl = _gvn.transform( new CatchProjNode(catch_, i+1,handler_bci));
852 // This handler cannot happen?
853 if (ctrl == top()) continue;
854 set_control(ctrl);
855
856 // Create exception oop
857 const TypeInstPtr* extype = extypes->at(i)->is_instptr();
858 Node *ex_oop = _gvn.transform(new CreateExNode(extypes->at(i), ctrl, i_o));
859
860 // Handle unloaded exception classes.
861 if (saw_unloaded->contains(handler_bci)) {
862 // An unloaded exception type is coming here. Do an uncommon trap.
863 #ifndef PRODUCT
864 // We do not expect the same handler bci to take both cold unloaded
865 // and hot loaded exceptions. But, watch for it.
866 if ((Verbose || WizardMode) && extype->is_loaded()) {
867 tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci());
868 method()->print_name(); tty->cr();
869 } else if (PrintOpto && (Verbose || WizardMode)) {
870 tty->print("Bailing out on unloaded exception type ");
871 extype->instance_klass()->print_name();
872 tty->print(" at bci:%d in ", bci());
873 method()->print_name(); tty->cr();
874 }
875 #endif
876 // Emit an uncommon trap instead of processing the block.
877 set_bci(handler_bci);
878 push_ex_oop(ex_oop);
879 uncommon_trap(Deoptimization::Reason_unloaded,
880 Deoptimization::Action_reinterpret,
881 extype->instance_klass(), "!loaded exception");
882 set_bci(iter().cur_bci()); // put it back
883 continue;
884 }
885
886 // go to the exception handler
887 if (handler_bci < 0) { // merge with corresponding rethrow node
888 throw_to_exit(make_exception_state(ex_oop));
889 } else { // Else jump to corresponding handle
890 push_ex_oop(ex_oop); // Clear stack and push just the oop.
891 merge_exception(handler_bci);
892 }
893 }
894
895 // The first CatchProj is for the normal return.
896 // (Note: If this is a call to rethrow_Java, this node goes dead.)
897 set_control(_gvn.transform( new CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
898 }
899
900
901 //----------------------------catch_inline_exceptions--------------------------
902 // Handle all exceptions thrown by an inlined method or individual bytecode.
903 // Common case 1: we have no handler, so all exceptions merge right into
904 // the rethrow case.
905 // Case 2: we have some handlers, with loaded exception klasses that have
906 // no subklasses. We do a Deutsch-Schiffman style type-check on the incoming
907 // exception oop and branch to the handler directly.
908 // Case 3: We have some handlers with subklasses or are not loaded at
909 // compile-time. We have to call the runtime to resolve the exception.
910 // So we insert a RethrowCall and all the logic that goes with it.
911 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
912 // Caller is responsible for saving away the map for normal control flow!
913 assert(stopped(), "call set_map(NULL) first");
914 assert(method()->has_exception_handlers(), "don't come here w/o work to do");
915
916 Node* ex_node = saved_ex_oop(ex_map);
917 if (ex_node == top()) {
918 // No action needed.
919 return;
920 }
921 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
922 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
923 if (ex_type == NULL)
924 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
925
926 // determine potential exception handlers
927 ciExceptionHandlerStream handlers(method(), bci(),
928 ex_type->instance_klass(),
929 ex_type->klass_is_exact());
930
931 // Start executing from the given throw state. (Keep its stack, for now.)
932 // Get the exception oop as known at compile time.
933 ex_node = use_exception_state(ex_map);
934
935 // Get the exception oop klass from its header
936 Node* ex_klass_node = NULL;
937 if (has_ex_handler() && !ex_type->klass_is_exact()) {
938 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
939 ex_klass_node = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
940
941 // Compute the exception klass a little more cleverly.
942 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
943 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
944 // each arm of the Phi. If I know something clever about the exceptions
945 // I'm loading the class from, I can replace the LoadKlass with the
946 // klass constant for the exception oop.
947 if (ex_node->is_Phi()) {
948 ex_klass_node = new PhiNode(ex_node->in(0), TypeInstKlassPtr::OBJECT);
949 for (uint i = 1; i < ex_node->req(); i++) {
950 Node* ex_in = ex_node->in(i);
951 if (ex_in == top() || ex_in == NULL) {
952 // This path was not taken.
953 ex_klass_node->init_req(i, top());
954 continue;
955 }
956 Node* p = basic_plus_adr(ex_in, ex_in, oopDesc::klass_offset_in_bytes());
957 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
958 ex_klass_node->init_req( i, k );
959 }
960 _gvn.set_type(ex_klass_node, TypeInstKlassPtr::OBJECT);
961
962 }
963 }
964
965 // Scan the exception table for applicable handlers.
966 // If none, we can call rethrow() and be done!
967 // If precise (loaded with no subklasses), insert a D.S. style
968 // pointer compare to the correct handler and loop back.
969 // If imprecise, switch to the Rethrow VM-call style handling.
970
971 int remaining = handlers.count_remaining();
972
973 // iterate through all entries sequentially
974 for (;!handlers.is_done(); handlers.next()) {
975 ciExceptionHandler* handler = handlers.handler();
976
977 if (handler->is_rethrow()) {
978 // If we fell off the end of the table without finding an imprecise
979 // exception klass (and without finding a generic handler) then we
980 // know this exception is not handled in this method. We just rethrow
981 // the exception into the caller.
982 throw_to_exit(make_exception_state(ex_node));
983 return;
984 }
985
986 // exception handler bci range covers throw_bci => investigate further
987 int handler_bci = handler->handler_bci();
988
989 if (remaining == 1) {
990 push_ex_oop(ex_node); // Push exception oop for handler
991 if (PrintOpto && WizardMode) {
992 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
993 }
994 merge_exception(handler_bci); // jump to handler
995 return; // No more handling to be done here!
996 }
997
998 // Get the handler's klass
999 ciInstanceKlass* klass = handler->catch_klass();
1000
1001 if (!klass->is_loaded()) { // klass is not loaded?
1002 // fall through into catch_call_exceptions which will emit a
1003 // handler with an uncommon trap.
1004 break;
1005 }
1006
1007 if (klass->is_interface()) // should not happen, but...
1008 break; // bail out
1009
1010 // Check the type of the exception against the catch type
1011 const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
1012 Node* con = _gvn.makecon(tk);
1013 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
1014 if (!stopped()) {
1015 PreserveJVMState pjvms(this);
1016 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
1017 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
1018 Node* ex_oop = _gvn.transform(new CheckCastPPNode(control(), ex_node, tinst));
1019 push_ex_oop(ex_oop); // Push exception oop for handler
1020 if (PrintOpto && WizardMode) {
1021 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
1022 klass->print_name();
1023 tty->cr();
1024 }
1025 merge_exception(handler_bci);
1026 }
1027 set_control(not_subtype_ctrl);
1028
1029 // Come here if exception does not match handler.
1030 // Carry on with more handler checks.
1031 --remaining;
1032 }
1033
1034 assert(!stopped(), "you should return if you finish the chain");
1035
1036 // Oops, need to call into the VM to resolve the klasses at runtime.
1037 // Note: This call must not deoptimize, since it is not a real at this bci!
1038 kill_dead_locals();
1039
1040 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
1041 OptoRuntime::rethrow_Type(),
1042 OptoRuntime::rethrow_stub(),
1043 NULL, NULL,
1044 ex_node);
1045
1046 // Rethrow is a pure call, no side effects, only a result.
1047 // The result cannot be allocated, so we use I_O
1048
1049 // Catch exceptions from the rethrow
1050 catch_call_exceptions(handlers);
1051 }
1052
1053
1054 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.)
1055
1056
1057 #ifndef PRODUCT
1058 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
1059 if( CountCompiledCalls ) {
1060 if( at_method_entry ) {
1061 // bump invocation counter if top method (for statistics)
1062 if (CountCompiledCalls && depth() == 1) {
1063 const TypePtr* addr_type = TypeMetadataPtr::make(method());
1064 Node* adr1 = makecon(addr_type);
1065 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset()));
1066 increment_counter(adr2);
1067 }
1068 } else if (is_inline) {
1069 switch (bc()) {
1070 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
1071 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
1072 case Bytecodes::_invokestatic:
1073 case Bytecodes::_invokedynamic:
1074 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
1075 default: fatal("unexpected call bytecode");
1076 }
1077 } else {
1078 switch (bc()) {
1079 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
1080 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
1081 case Bytecodes::_invokestatic:
1082 case Bytecodes::_invokedynamic:
1083 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break;
1084 default: fatal("unexpected call bytecode");
1085 }
1086 }
1087 }
1088 }
1089 #endif //PRODUCT
1090
1091
1092 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, ciInstanceKlass* klass,
1093 ciKlass* holder, ciMethod* callee,
1094 const TypeOopPtr* receiver_type, bool is_virtual,
1095 bool& call_does_dispatch, int& vtable_index,
1096 bool check_access) {
1097 // Set default values for out-parameters.
1098 call_does_dispatch = true;
1099 vtable_index = Method::invalid_vtable_index;
1100
1101 // Choose call strategy.
1102 ciMethod* optimized_virtual_method = optimize_inlining(caller, klass, holder, callee,
1103 receiver_type, check_access);
1104
1105 // Have the call been sufficiently improved such that it is no longer a virtual?
1106 if (optimized_virtual_method != NULL) {
1107 callee = optimized_virtual_method;
1108 call_does_dispatch = false;
1109 } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) {
1110 // We can make a vtable call at this site
1111 vtable_index = callee->resolve_vtable_index(caller->holder(), holder);
1112 }
1113 return callee;
1114 }
1115
1116 // Identify possible target method and inlining style
1117 ciMethod* Compile::optimize_inlining(ciMethod* caller, ciInstanceKlass* klass, ciKlass* holder,
1118 ciMethod* callee, const TypeOopPtr* receiver_type,
1119 bool check_access) {
1120 // only use for virtual or interface calls
1121
1122 // If it is obviously final, do not bother to call find_monomorphic_target,
1123 // because the class hierarchy checks are not needed, and may fail due to
1124 // incompletely loaded classes. Since we do our own class loading checks
1125 // in this module, we may confidently bind to any method.
1126 if (callee->can_be_statically_bound()) {
1127 return callee;
1128 }
1129
1130 if (receiver_type == NULL) {
1131 return NULL; // no receiver type info
1132 }
1133
1134 // Attempt to improve the receiver
1135 bool actual_receiver_is_exact = false;
1136 ciInstanceKlass* actual_receiver = klass;
1137 // Array methods are all inherited from Object, and are monomorphic.
1138 // finalize() call on array is not allowed.
1139 if (receiver_type->isa_aryptr() &&
1140 callee->holder() == env()->Object_klass() &&
1141 callee->name() != ciSymbols::finalize_method_name()) {
1142 return callee;
1143 }
1144
1145 // All other interesting cases are instance klasses.
1146 if (!receiver_type->isa_instptr()) {
1147 return NULL;
1148 }
1149
1150 ciInstanceKlass* receiver_klass = receiver_type->is_instptr()->instance_klass();
1151 if (receiver_klass->is_loaded() && receiver_klass->is_initialized() && !receiver_klass->is_interface() &&
1152 (receiver_klass == actual_receiver || receiver_klass->is_subtype_of(actual_receiver))) {
1153 // ikl is a same or better type than the original actual_receiver,
1154 // e.g. static receiver from bytecodes.
1155 actual_receiver = receiver_klass;
1156 // Is the actual_receiver exact?
1157 actual_receiver_is_exact = receiver_type->klass_is_exact();
1158 }
1159
1160 ciInstanceKlass* calling_klass = caller->holder();
1161 ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver, check_access);
1162
1163 if (cha_monomorphic_target != NULL) {
1164 // Hardwiring a virtual.
1165 assert(!callee->can_be_statically_bound(), "should have been handled earlier");
1166 assert(!cha_monomorphic_target->is_abstract(), "");
1167 if (!cha_monomorphic_target->can_be_statically_bound(actual_receiver)) {
1168 // If we inlined because CHA revealed only a single target method,
1169 // then we are dependent on that target method not getting overridden
1170 // by dynamic class loading. Be sure to test the "static" receiver
1171 // dest_method here, as opposed to the actual receiver, which may
1172 // falsely lead us to believe that the receiver is final or private.
1173 dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target, holder, callee);
1174 }
1175 return cha_monomorphic_target;
1176 }
1177
1178 // If the type is exact, we can still bind the method w/o a vcall.
1179 // (This case comes after CHA so we can see how much extra work it does.)
1180 if (actual_receiver_is_exact) {
1181 // In case of evolution, there is a dependence on every inlined method, since each
1182 // such method can be changed when its class is redefined.
1183 ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver);
1184 if (exact_method != NULL) {
1185 return exact_method;
1186 }
1187 }
1188
1189 return NULL;
1190 }