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