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