1 /*
2 * Copyright (c) 1998, 2025, 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 "ci/ciCallSite.hpp"
26 #include "ci/ciMethodHandle.hpp"
27 #include "ci/ciSymbols.hpp"
28 #include "classfile/vmIntrinsics.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "compiler/compileLog.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "jvm_io.h"
34 #include "logging/log.hpp"
35 #include "logging/logLevel.hpp"
36 #include "logging/logMessage.hpp"
37 #include "logging/logStream.hpp"
38 #include "opto/addnode.hpp"
39 #include "opto/callGenerator.hpp"
40 #include "opto/castnode.hpp"
41 #include "opto/cfgnode.hpp"
42 #include "opto/inlinetypenode.hpp"
43 #include "opto/mulnode.hpp"
44 #include "opto/parse.hpp"
45 #include "opto/rootnode.hpp"
46 #include "opto/runtime.hpp"
47 #include "opto/subnode.hpp"
48 #include "prims/methodHandles.hpp"
49 #include "runtime/sharedRuntime.hpp"
50 #include "utilities/macros.hpp"
51 #if INCLUDE_JFR
52 #include "jfr/jfr.hpp"
53 #endif
54
55 static void print_trace_type_profile(outputStream* out, int depth, ciKlass* prof_klass, int site_count, int receiver_count,
56 bool with_deco) {
57 if (with_deco) {
58 CompileTask::print_inline_indent(depth, out);
59 }
60 out->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count);
61 prof_klass->name()->print_symbol_on(out);
62 if (with_deco) {
63 out->cr();
64 }
65 }
66
67 static void trace_type_profile(Compile* C, ciMethod* method, JVMState* jvms,
68 ciMethod* prof_method, ciKlass* prof_klass, int site_count, int receiver_count) {
69 int depth = jvms->depth() - 1;
70 int bci = jvms->bci();
71 if (TraceTypeProfile || C->print_inlining()) {
72 if (!C->print_inlining()) {
73 if (!PrintOpto && !PrintCompilation) {
74 method->print_short_name();
75 tty->cr();
76 }
77 CompileTask::print_inlining_tty(prof_method, depth, bci, InliningResult::SUCCESS);
78 print_trace_type_profile(tty, depth, prof_klass, site_count, receiver_count, true);
79 } else {
80 auto stream = C->inline_printer()->record(method, jvms, InliningResult::SUCCESS);
81 print_trace_type_profile(stream, depth, prof_klass, site_count, receiver_count, false);
82 }
83 }
84
85 LogTarget(Debug, jit, inlining) lt;
86 if (lt.is_enabled()) {
87 LogStream ls(lt);
88 print_trace_type_profile(&ls, depth, prof_klass, site_count, receiver_count, true);
89 }
90 }
91
92 static bool arg_can_be_larval(ciMethod* callee, int arg_idx) {
93 if (callee->is_object_constructor() && arg_idx == 0) {
94 return true;
95 }
96
97 if (arg_idx != 1 || callee->intrinsic_id() == vmIntrinsicID::_none) {
98 return false;
99 }
100
101 switch (callee->intrinsic_id()) {
102 case vmIntrinsicID::_finishPrivateBuffer:
103 case vmIntrinsicID::_putBoolean:
104 case vmIntrinsicID::_putBooleanOpaque:
105 case vmIntrinsicID::_putBooleanRelease:
106 case vmIntrinsicID::_putBooleanVolatile:
107 case vmIntrinsicID::_putByte:
108 case vmIntrinsicID::_putByteOpaque:
109 case vmIntrinsicID::_putByteRelease:
110 case vmIntrinsicID::_putByteVolatile:
111 case vmIntrinsicID::_putChar:
112 case vmIntrinsicID::_putCharOpaque:
113 case vmIntrinsicID::_putCharRelease:
114 case vmIntrinsicID::_putCharUnaligned:
115 case vmIntrinsicID::_putCharVolatile:
116 case vmIntrinsicID::_putShort:
117 case vmIntrinsicID::_putShortOpaque:
118 case vmIntrinsicID::_putShortRelease:
119 case vmIntrinsicID::_putShortUnaligned:
120 case vmIntrinsicID::_putShortVolatile:
121 case vmIntrinsicID::_putInt:
122 case vmIntrinsicID::_putIntOpaque:
123 case vmIntrinsicID::_putIntRelease:
124 case vmIntrinsicID::_putIntUnaligned:
125 case vmIntrinsicID::_putIntVolatile:
126 case vmIntrinsicID::_putLong:
127 case vmIntrinsicID::_putLongOpaque:
128 case vmIntrinsicID::_putLongRelease:
129 case vmIntrinsicID::_putLongUnaligned:
130 case vmIntrinsicID::_putLongVolatile:
131 case vmIntrinsicID::_putFloat:
132 case vmIntrinsicID::_putFloatOpaque:
133 case vmIntrinsicID::_putFloatRelease:
134 case vmIntrinsicID::_putFloatVolatile:
135 case vmIntrinsicID::_putDouble:
136 case vmIntrinsicID::_putDoubleOpaque:
137 case vmIntrinsicID::_putDoubleRelease:
138 case vmIntrinsicID::_putDoubleVolatile:
139 case vmIntrinsicID::_putReference:
140 case vmIntrinsicID::_putReferenceOpaque:
141 case vmIntrinsicID::_putReferenceRelease:
142 case vmIntrinsicID::_putReferenceVolatile:
143 return true;
144 default:
145 return false;
146 }
147 }
148
149 CallGenerator* Compile::call_generator(ciMethod* callee, int vtable_index, bool call_does_dispatch,
150 JVMState* jvms, bool allow_inline,
151 float prof_factor, ciKlass* speculative_receiver_type,
152 bool allow_intrinsics) {
153 assert(callee != nullptr, "failed method resolution");
154
155 ciMethod* caller = jvms->method();
156 int bci = jvms->bci();
157 Bytecodes::Code bytecode = caller->java_code_at_bci(bci);
158 ciMethod* orig_callee = caller->get_method_at_bci(bci);
159
160 const bool is_virtual = (bytecode == Bytecodes::_invokevirtual) || (orig_callee->intrinsic_id() == vmIntrinsics::_linkToVirtual);
161 const bool is_interface = (bytecode == Bytecodes::_invokeinterface) || (orig_callee->intrinsic_id() == vmIntrinsics::_linkToInterface);
162 const bool is_virtual_or_interface = is_virtual || is_interface;
163
164 const bool check_access = !orig_callee->is_method_handle_intrinsic(); // method handle intrinsics don't perform access checks
165
166 // Dtrace currently doesn't work unless all calls are vanilla
167 if (env()->dtrace_method_probes()) {
168 allow_inline = false;
169 }
170
171 // Note: When we get profiling during stage-1 compiles, we want to pull
172 // from more specific profile data which pertains to this inlining.
173 // Right now, ignore the information in jvms->caller(), and do method[bci].
174 ciCallProfile profile = caller->call_profile_at_bci(bci);
175
176 // See how many times this site has been invoked.
177 int site_count = profile.count();
178 int receiver_count = -1;
179 if (call_does_dispatch && UseTypeProfile && profile.has_receiver(0)) {
180 // Receivers in the profile structure are ordered by call counts
181 // so that the most called (major) receiver is profile.receiver(0).
182 receiver_count = profile.receiver_count(0);
183 }
184
185 CompileLog* log = this->log();
186 if (log != nullptr) {
187 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
188 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1;
189 log->begin_elem("call method='%d' count='%d' prof_factor='%f'",
190 log->identify(callee), site_count, prof_factor);
191 if (call_does_dispatch) log->print(" virtual='1'");
192 if (allow_inline) log->print(" inline='1'");
193 if (receiver_count >= 0) {
194 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
195 if (profile.has_receiver(1)) {
196 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
197 }
198 }
199 if (callee->is_method_handle_intrinsic()) {
200 log->print(" method_handle_intrinsic='1'");
201 }
202 log->end_elem();
203 }
204
205 // Special case the handling of certain common, profitable library
206 // methods. If these methods are replaced with specialized code,
207 // then we return it as the inlined version of the call.
208 CallGenerator* cg_intrinsic = nullptr;
209 if (callee->intrinsic_id() == vmIntrinsics::_makePrivateBuffer || callee->intrinsic_id() == vmIntrinsics::_finishPrivateBuffer) {
210 // These methods must be inlined so that we don't have larval value objects crossing method
211 // boundaries
212 assert(!call_does_dispatch, "callee should not be virtual %s", callee->name()->as_utf8());
213 CallGenerator* cg = find_intrinsic(callee, call_does_dispatch);
214
215 if (cg == nullptr) {
216 // This is probably because the intrinsics is disabled from the command line
217 char reason[256];
218 jio_snprintf(reason, sizeof(reason), "cannot find an intrinsics for %s", callee->name()->as_utf8());
219 C->record_method_not_compilable(reason);
220 return nullptr;
221 }
222 return cg;
223 } else if (allow_inline && allow_intrinsics) {
224 CallGenerator* cg = find_intrinsic(callee, call_does_dispatch);
225 if (cg != nullptr) {
226 if (cg->is_predicated()) {
227 // Code without intrinsic but, hopefully, inlined.
228 CallGenerator* inline_cg = this->call_generator(callee,
229 vtable_index, call_does_dispatch, jvms, allow_inline, prof_factor, speculative_receiver_type, false);
230 if (inline_cg != nullptr) {
231 cg = CallGenerator::for_predicated_intrinsic(cg, inline_cg);
232 }
233 }
234
235 // If intrinsic does the virtual dispatch, we try to use the type profile
236 // first, and hopefully inline it as the regular virtual call below.
237 // We will retry the intrinsic if nothing had claimed it afterwards.
238 if (cg->does_virtual_dispatch()) {
239 cg_intrinsic = cg;
240 cg = nullptr;
241 } else if (IncrementalInline && should_delay_vector_inlining(callee, jvms)) {
242 return CallGenerator::for_late_inline(callee, cg);
243 } else {
244 return cg;
245 }
246 }
247 }
248
249 // Do method handle calls.
250 // NOTE: This must happen before normal inlining logic below since
251 // MethodHandle.invoke* are native methods which obviously don't
252 // have bytecodes and so normal inlining fails.
253 if (callee->is_method_handle_intrinsic()) {
254 CallGenerator* cg = CallGenerator::for_method_handle_call(jvms, caller, callee, allow_inline);
255 return cg;
256 }
257
258 // Attempt to inline...
259 if (allow_inline) {
260 // The profile data is only partly attributable to this caller,
261 // scale back the call site information.
262 float past_uses = jvms->method()->scale_count(site_count, prof_factor);
263 // This is the number of times we expect the call code to be used.
264 float expected_uses = past_uses;
265
266 // Try inlining a bytecoded method:
267 if (!call_does_dispatch) {
268 InlineTree* ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
269 bool should_delay = C->should_delay_inlining();
270 if (ilt->ok_to_inline(callee, jvms, profile, should_delay)) {
271 CallGenerator* cg = CallGenerator::for_inline(callee, expected_uses);
272 // For optimized virtual calls assert at runtime that receiver object
273 // is a subtype of the inlined method holder. CHA can report a method
274 // as a unique target under an abstract method, but receiver type
275 // sometimes has a broader type. Similar scenario is possible with
276 // default methods when type system loses information about implemented
277 // interfaces.
278 if (cg != nullptr && is_virtual_or_interface && !callee->is_static()) {
279 CallGenerator* trap_cg = CallGenerator::for_uncommon_trap(callee,
280 Deoptimization::Reason_receiver_constraint, Deoptimization::Action_none);
281
282 cg = CallGenerator::for_guarded_call(callee->holder(), trap_cg, cg);
283 }
284 if (cg != nullptr) {
285 // Delay the inlining of this method to give us the
286 // opportunity to perform some high level optimizations
287 // first.
288 if (should_delay) {
289 return CallGenerator::for_late_inline(callee, cg);
290 } else if (should_delay_string_inlining(callee, jvms)) {
291 return CallGenerator::for_string_late_inline(callee, cg);
292 } else if (should_delay_boxing_inlining(callee, jvms)) {
293 return CallGenerator::for_boxing_late_inline(callee, cg);
294 } else if (should_delay_vector_reboxing_inlining(callee, jvms)) {
295 return CallGenerator::for_vector_reboxing_late_inline(callee, cg);
296 } else {
297 return cg;
298 }
299 }
300 }
301 }
302
303 // Try using the type profile.
304 if (call_does_dispatch && site_count > 0 && UseTypeProfile) {
305 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
306 bool have_major_receiver = profile.has_receiver(0) && (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
307 ciMethod* receiver_method = nullptr;
308
309 int morphism = profile.morphism();
310 if (speculative_receiver_type != nullptr) {
311 if (!too_many_traps_or_recompiles(caller, bci, Deoptimization::Reason_speculate_class_check)) {
312 // We have a speculative type, we should be able to resolve
313 // the call. We do that before looking at the profiling at
314 // this invoke because it may lead to bimorphic inlining which
315 // a speculative type should help us avoid.
316 receiver_method = callee->resolve_invoke(jvms->method()->holder(),
317 speculative_receiver_type,
318 check_access);
319 if (receiver_method == nullptr) {
320 speculative_receiver_type = nullptr;
321 } else {
322 morphism = 1;
323 }
324 } else {
325 // speculation failed before. Use profiling at the call
326 // (could allow bimorphic inlining for instance).
327 speculative_receiver_type = nullptr;
328 }
329 }
330 if (receiver_method == nullptr &&
331 (have_major_receiver || morphism == 1 ||
332 (morphism == 2 && UseBimorphicInlining))) {
333 // receiver_method = profile.method();
334 // Profiles do not suggest methods now. Look it up in the major receiver.
335 assert(check_access, "required");
336 receiver_method = callee->resolve_invoke(jvms->method()->holder(),
337 profile.receiver(0));
338 }
339 if (receiver_method != nullptr) {
340 // The single majority receiver sufficiently outweighs the minority.
341 CallGenerator* hit_cg = this->call_generator(receiver_method,
342 vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
343 if (hit_cg != nullptr) {
344 // Look up second receiver.
345 CallGenerator* next_hit_cg = nullptr;
346 ciMethod* next_receiver_method = nullptr;
347 if (morphism == 2 && UseBimorphicInlining) {
348 assert(check_access, "required");
349 next_receiver_method = callee->resolve_invoke(jvms->method()->holder(),
350 profile.receiver(1));
351 if (next_receiver_method != nullptr) {
352 next_hit_cg = this->call_generator(next_receiver_method,
353 vtable_index, !call_does_dispatch, jvms,
354 allow_inline, prof_factor);
355 if (next_hit_cg != nullptr && !next_hit_cg->is_inline() &&
356 have_major_receiver && UseOnlyInlinedBimorphic) {
357 // Skip if we can't inline second receiver's method
358 next_hit_cg = nullptr;
359 }
360 }
361 }
362 CallGenerator* miss_cg;
363 Deoptimization::DeoptReason reason = (morphism == 2
364 ? Deoptimization::Reason_bimorphic
365 : Deoptimization::reason_class_check(speculative_receiver_type != nullptr));
366 if ((morphism == 1 || (morphism == 2 && next_hit_cg != nullptr)) &&
367 !too_many_traps_or_recompiles(caller, bci, reason)
368 ) {
369 // Generate uncommon trap for class check failure path
370 // in case of monomorphic or bimorphic virtual call site.
371 miss_cg = CallGenerator::for_uncommon_trap(callee, reason,
372 Deoptimization::Action_maybe_recompile);
373 } else {
374 // Generate virtual call for class check failure path
375 // in case of polymorphic virtual call site.
376 miss_cg = (IncrementalInlineVirtual ? CallGenerator::for_late_inline_virtual(callee, vtable_index, prof_factor)
377 : CallGenerator::for_virtual_call(callee, vtable_index));
378 }
379 if (miss_cg != nullptr) {
380 if (next_hit_cg != nullptr) {
381 assert(speculative_receiver_type == nullptr, "shouldn't end up here if we used speculation");
382 trace_type_profile(C, jvms->method(), jvms, next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1));
383 // We don't need to record dependency on a receiver here and below.
384 // Whenever we inline, the dependency is added by Parse::Parse().
385 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
386 }
387 if (miss_cg != nullptr) {
388 ciKlass* k = speculative_receiver_type != nullptr ? speculative_receiver_type : profile.receiver(0);
389 trace_type_profile(C, jvms->method(), jvms, receiver_method, k, site_count, receiver_count);
390 float hit_prob = speculative_receiver_type != nullptr ? 1.0 : profile.receiver_prob(0);
391 CallGenerator* cg = CallGenerator::for_predicted_call(k, miss_cg, hit_cg, hit_prob);
392 if (cg != nullptr) {
393 return cg;
394 }
395 }
396 }
397 }
398 }
399 }
400
401 // If there is only one implementor of this interface then we
402 // may be able to bind this invoke directly to the implementing
403 // klass but we need both a dependence on the single interface
404 // and on the method we bind to. Additionally since all we know
405 // about the receiver type is that it's supposed to implement the
406 // interface we have to insert a check that it's the class we
407 // expect. Interface types are not checked by the verifier so
408 // they are roughly equivalent to Object.
409 // The number of implementors for declared_interface is less or
410 // equal to the number of implementors for target->holder() so
411 // if number of implementors of target->holder() == 1 then
412 // number of implementors for decl_interface is 0 or 1. If
413 // it's 0 then no class implements decl_interface and there's
414 // no point in inlining.
415 if (call_does_dispatch && is_interface) {
416 ciInstanceKlass* declared_interface = nullptr;
417 if (orig_callee->intrinsic_id() == vmIntrinsics::_linkToInterface) {
418 // MemberName doesn't keep information about resolved interface class (REFC) once
419 // resolution is over, but resolved method holder (DECC) can be used as a
420 // conservative approximation.
421 declared_interface = callee->holder();
422 } else {
423 assert(!orig_callee->is_method_handle_intrinsic(), "not allowed");
424 declared_interface = caller->get_declared_method_holder_at_bci(bci)->as_instance_klass();
425 }
426 assert(declared_interface->is_interface(), "required");
427 ciInstanceKlass* singleton = declared_interface->unique_implementor();
428
429 if (singleton != nullptr) {
430 assert(singleton != declared_interface, "not a unique implementor");
431
432 ciMethod* cha_monomorphic_target =
433 callee->find_monomorphic_target(caller->holder(), declared_interface, singleton, check_access);
434
435 if (cha_monomorphic_target != nullptr &&
436 cha_monomorphic_target->holder() != env()->Object_klass()) { // subtype check against Object is useless
437 ciKlass* holder = cha_monomorphic_target->holder();
438
439 // Try to inline the method found by CHA. Inlined method is guarded by the type check.
440 CallGenerator* hit_cg = call_generator(cha_monomorphic_target,
441 vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
442
443 // Deoptimize on type check fail. The interpreter will throw ICCE for us.
444 CallGenerator* miss_cg = CallGenerator::for_uncommon_trap(callee,
445 Deoptimization::Reason_class_check, Deoptimization::Action_none);
446
447 ciKlass* constraint = (holder->is_subclass_of(singleton) ? holder : singleton); // avoid upcasts
448 CallGenerator* cg = CallGenerator::for_guarded_call(constraint, miss_cg, hit_cg);
449 if (hit_cg != nullptr && cg != nullptr) {
450 dependencies()->assert_unique_implementor(declared_interface, singleton);
451 dependencies()->assert_unique_concrete_method(declared_interface, cha_monomorphic_target, declared_interface, callee);
452 return cg;
453 }
454 }
455 }
456 } // call_does_dispatch && is_interface
457
458 // Nothing claimed the intrinsic, we go with straight-forward inlining
459 // for already discovered intrinsic.
460 if (allow_intrinsics && cg_intrinsic != nullptr) {
461 assert(cg_intrinsic->does_virtual_dispatch(), "sanity");
462 return cg_intrinsic;
463 }
464 } // allow_inline
465
466 // There was no special inlining tactic, or it bailed out.
467 // Use a more generic tactic, like a simple call.
468 if (call_does_dispatch) {
469 const char* msg = "virtual call";
470 C->inline_printer()->record(callee, jvms, InliningResult::FAILURE, msg);
471 C->log_inline_failure(msg);
472 if (IncrementalInlineVirtual && allow_inline) {
473 return CallGenerator::for_late_inline_virtual(callee, vtable_index, prof_factor); // attempt to inline through virtual call later
474 } else {
475 return CallGenerator::for_virtual_call(callee, vtable_index);
476 }
477 } else {
478 // Class Hierarchy Analysis or Type Profile reveals a unique target, or it is a static or special call.
479 CallGenerator* cg = CallGenerator::for_direct_call(callee, should_delay_inlining(callee, jvms));
480 // For optimized virtual calls assert at runtime that receiver object
481 // is a subtype of the method holder.
482 if (cg != nullptr && is_virtual_or_interface && !callee->is_static()) {
483 CallGenerator* trap_cg = CallGenerator::for_uncommon_trap(callee,
484 Deoptimization::Reason_receiver_constraint, Deoptimization::Action_none);
485 cg = CallGenerator::for_guarded_call(callee->holder(), trap_cg, cg);
486 }
487 return cg;
488 }
489 }
490
491 // Return true for methods that shouldn't be inlined early so that
492 // they are easier to analyze and optimize as intrinsics.
493 bool Compile::should_delay_string_inlining(ciMethod* call_method, JVMState* jvms) {
494 if (has_stringbuilder()) {
495
496 if ((call_method->holder() == C->env()->StringBuilder_klass() ||
497 call_method->holder() == C->env()->StringBuffer_klass()) &&
498 (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
499 jvms->method()->holder() == C->env()->StringBuffer_klass())) {
500 // Delay SB calls only when called from non-SB code
501 return false;
502 }
503
504 switch (call_method->intrinsic_id()) {
505 case vmIntrinsics::_StringBuilder_void:
506 case vmIntrinsics::_StringBuilder_int:
507 case vmIntrinsics::_StringBuilder_String:
508 case vmIntrinsics::_StringBuilder_append_char:
509 case vmIntrinsics::_StringBuilder_append_int:
510 case vmIntrinsics::_StringBuilder_append_String:
511 case vmIntrinsics::_StringBuilder_toString:
512 case vmIntrinsics::_StringBuffer_void:
513 case vmIntrinsics::_StringBuffer_int:
514 case vmIntrinsics::_StringBuffer_String:
515 case vmIntrinsics::_StringBuffer_append_char:
516 case vmIntrinsics::_StringBuffer_append_int:
517 case vmIntrinsics::_StringBuffer_append_String:
518 case vmIntrinsics::_StringBuffer_toString:
519 case vmIntrinsics::_Integer_toString:
520 return true;
521
522 case vmIntrinsics::_String_String:
523 {
524 Node* receiver = jvms->map()->in(jvms->argoff() + 1);
525 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
526 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
527 ciMethod* m = csj->method();
528 if (m != nullptr &&
529 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
530 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
531 // Delay String.<init>(new SB())
532 return true;
533 }
534 return false;
535 }
536
537 default:
538 return false;
539 }
540 }
541 return false;
542 }
543
544 bool Compile::should_delay_boxing_inlining(ciMethod* call_method, JVMState* jvms) {
545 if (eliminate_boxing() && call_method->is_boxing_method()) {
546 set_has_boxed_value(true);
547 return aggressive_unboxing();
548 }
549 return false;
550 }
551
552 bool Compile::should_delay_vector_inlining(ciMethod* call_method, JVMState* jvms) {
553 return EnableVectorSupport && call_method->is_vector_method();
554 }
555
556 bool Compile::should_delay_vector_reboxing_inlining(ciMethod* call_method, JVMState* jvms) {
557 return EnableVectorSupport && (call_method->intrinsic_id() == vmIntrinsics::_VectorRebox);
558 }
559
560 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
561 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
562 // Additional inputs to consider...
563 // bc = bc()
564 // caller = method()
565 // iter().get_method_holder_index()
566 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
567 // Interface classes can be loaded & linked and never get around to
568 // being initialized. Uncommon-trap for not-initialized static or
569 // v-calls. Let interface calls happen.
570 ciInstanceKlass* holder_klass = dest_method->holder();
571 if (!holder_klass->is_being_initialized() &&
572 !holder_klass->is_initialized() &&
573 !holder_klass->is_interface()) {
574 uncommon_trap(Deoptimization::Reason_uninitialized,
575 Deoptimization::Action_reinterpret,
576 holder_klass);
577 return true;
578 }
579
580 assert(dest_method->is_loaded(), "dest_method: typeflow responsibility");
581 return false;
582 }
583
584 #ifdef ASSERT
585 static bool check_call_consistency(JVMState* jvms, CallGenerator* cg) {
586 ciMethod* symbolic_info = jvms->method()->get_method_at_bci(jvms->bci());
587 ciMethod* resolved_method = cg->method();
588 if (!ciMethod::is_consistent_info(symbolic_info, resolved_method)) {
589 tty->print_cr("JVMS:");
590 jvms->dump();
591 tty->print_cr("Bytecode info:");
592 jvms->method()->get_method_at_bci(jvms->bci())->print(); tty->cr();
593 tty->print_cr("Resolved method:");
594 cg->method()->print(); tty->cr();
595 return false;
596 }
597 return true;
598 }
599 #endif // ASSERT
600
601 //------------------------------do_call----------------------------------------
602 // Handle your basic call. Inline if we can & want to, else just setup call.
603 void Parse::do_call() {
604 // It's likely we are going to add debug info soon.
605 // Also, if we inline a guy who eventually needs debug info for this JVMS,
606 // our contribution to it is cleaned up right here.
607 kill_dead_locals();
608
609 // Set frequently used booleans
610 const bool is_virtual = bc() == Bytecodes::_invokevirtual;
611 const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
612 const bool has_receiver = Bytecodes::has_receiver(bc());
613
614 // Find target being called
615 bool will_link;
616 ciSignature* declared_signature = nullptr;
617 ciMethod* orig_callee = iter().get_method(will_link, &declared_signature); // callee in the bytecode
618 ciInstanceKlass* holder_klass = orig_callee->holder();
619 ciKlass* holder = iter().get_declared_method_holder();
620 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
621 assert(declared_signature != nullptr, "cannot be null");
622 JFR_ONLY(Jfr::on_resolution(this, holder, orig_callee);)
623
624 // Bump max node limit for JSR292 users
625 if (bc() == Bytecodes::_invokedynamic || orig_callee->is_method_handle_intrinsic()) {
626 C->set_max_node_limit(3*MaxNodeLimit);
627 }
628
629 // uncommon-trap when callee is unloaded, uninitialized or will not link
630 // bailout when too many arguments for register representation
631 if (!will_link || can_not_compile_call_site(orig_callee, klass)) {
632 if (PrintOpto && (Verbose || WizardMode)) {
633 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
634 orig_callee->print_name(); tty->cr();
635 }
636 return;
637 }
638 assert(holder_klass->is_loaded(), "");
639 //assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); // XXX invokehandle (cur_bc_raw)
640 // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
641 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
642 assert(holder_klass->is_interface() || holder_klass->super() == nullptr || (bc() != Bytecodes::_invokeinterface), "must match bc");
643 // Note: In the absence of miranda methods, an abstract class K can perform
644 // an invokevirtual directly on an interface method I.m if K implements I.
645
646 // orig_callee is the resolved callee which's signature includes the
647 // appendix argument.
648 const int nargs = orig_callee->arg_size();
649 const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id());
650
651 // Push appendix argument (MethodType, CallSite, etc.), if one.
652 if (iter().has_appendix()) {
653 ciObject* appendix_arg = iter().get_appendix();
654 const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg, /* require_const= */ true);
655 Node* appendix_arg_node = _gvn.makecon(appendix_arg_type);
656 push(appendix_arg_node);
657 }
658
659 // ---------------------
660 // Does Class Hierarchy Analysis reveal only a single target of a v-call?
661 // Then we may inline or make a static call, but become dependent on there being only 1 target.
662 // Does the call-site type profile reveal only one receiver?
663 // Then we may introduce a run-time check and inline on the path where it succeeds.
664 // The other path may uncommon_trap, check for another receiver, or do a v-call.
665
666 // Try to get the most accurate receiver type
667 ciMethod* callee = orig_callee;
668 int vtable_index = Method::invalid_vtable_index;
669 bool call_does_dispatch = false;
670
671 // Speculative type of the receiver if any
672 ciKlass* speculative_receiver_type = nullptr;
673 if (is_virtual_or_interface) {
674 Node* receiver_node = stack(sp() - nargs);
675 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
676 // call_does_dispatch and vtable_index are out-parameters. They might be changed.
677 // For arrays, klass below is Object. When vtable calls are used,
678 // resolving the call with Object would allow an illegal call to
679 // finalize() on an array. We use holder instead: illegal calls to
680 // finalize() won't be compiled as vtable calls (IC call
681 // resolution will catch the illegal call) and the few legal calls
682 // on array types won't be either.
683 callee = C->optimize_virtual_call(method(), klass, holder, orig_callee,
684 receiver_type, is_virtual,
685 call_does_dispatch, vtable_index); // out-parameters
686 speculative_receiver_type = receiver_type != nullptr ? receiver_type->speculative_type() : nullptr;
687 }
688
689 // Additional receiver subtype checks for interface calls via invokespecial or invokeinterface.
690 ciKlass* receiver_constraint = nullptr;
691 if (iter().cur_bc_raw() == Bytecodes::_invokespecial && !orig_callee->is_object_constructor()) {
692 ciInstanceKlass* calling_klass = method()->holder();
693 ciInstanceKlass* sender_klass = calling_klass;
694 if (sender_klass->is_interface()) {
695 receiver_constraint = sender_klass;
696 }
697 } else if (iter().cur_bc_raw() == Bytecodes::_invokeinterface && orig_callee->is_private()) {
698 assert(holder->is_interface(), "How did we get a non-interface method here!");
699 receiver_constraint = holder;
700 }
701
702 if (receiver_constraint != nullptr) {
703 Node* receiver_node = stack(sp() - nargs);
704 Node* cls_node = makecon(TypeKlassPtr::make(receiver_constraint, Type::trust_interfaces));
705 Node* bad_type_ctrl = nullptr;
706 Node* casted_receiver = gen_checkcast(receiver_node, cls_node, &bad_type_ctrl);
707 if (bad_type_ctrl != nullptr) {
708 PreserveJVMState pjvms(this);
709 set_control(bad_type_ctrl);
710 uncommon_trap(Deoptimization::Reason_class_check,
711 Deoptimization::Action_none);
712 }
713 if (stopped()) {
714 return; // MUST uncommon-trap?
715 }
716 set_stack(sp() - nargs, casted_receiver);
717 }
718
719 // Scalarize value objects passed into this invocation if we know that they are not larval
720 for (int arg_idx = 0; arg_idx < nargs; arg_idx++) {
721 if (arg_can_be_larval(callee, arg_idx)) {
722 continue;
723 }
724
725 cast_to_non_larval(peek(nargs - 1 - arg_idx));
726 }
727
728 // Note: It's OK to try to inline a virtual call.
729 // The call generator will not attempt to inline a polymorphic call
730 // unless it knows how to optimize the receiver dispatch.
731 bool try_inline = (C->do_inlining() || InlineAccessors);
732
733 // ---------------------
734 dec_sp(nargs); // Temporarily pop args for JVM state of call
735 JVMState* jvms = sync_jvms();
736
737 // ---------------------
738 // Decide call tactic.
739 // This call checks with CHA, the interpreter profile, intrinsics table, etc.
740 // It decides whether inlining is desirable or not.
741 CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type);
742 if (failing()) {
743 return;
744 }
745 assert(cg != nullptr, "must find a CallGenerator for callee %s", callee->name()->as_utf8());
746
747 // NOTE: Don't use orig_callee and callee after this point! Use cg->method() instead.
748 orig_callee = callee = nullptr;
749
750 // ---------------------
751
752 // Feed profiling data for arguments to the type system so it can
753 // propagate it as speculative types
754 record_profiled_arguments_for_speculation(cg->method(), bc());
755
756 #ifndef PRODUCT
757 // bump global counters for calls
758 count_compiled_calls(/*at_method_entry*/ false, cg->is_inline());
759
760 // Record first part of parsing work for this call
761 parse_histogram()->record_change();
762 #endif // not PRODUCT
763
764 assert(jvms == this->jvms(), "still operating on the right JVMS");
765 assert(jvms_in_sync(), "jvms must carry full info into CG");
766
767 // save across call, for a subsequent cast_not_null.
768 Node* receiver = has_receiver ? argument(0) : nullptr;
769
770 // The extra CheckCastPPs for speculative types mess with PhaseStringOpts
771 if (receiver != nullptr && !call_does_dispatch && !cg->is_string_late_inline()) {
772 // Feed profiling data for a single receiver to the type system so
773 // it can propagate it as a speculative type
774 receiver = record_profiled_receiver_for_speculation(receiver);
775 }
776
777 JVMState* new_jvms = cg->generate(jvms);
778 if (new_jvms == nullptr) {
779 // When inlining attempt fails (e.g., too many arguments),
780 // it may contaminate the current compile state, making it
781 // impossible to pull back and try again. Once we call
782 // cg->generate(), we are committed. If it fails, the whole
783 // compilation task is compromised.
784 if (failing()) return;
785
786 // This can happen if a library intrinsic is available, but refuses
787 // the call site, perhaps because it did not match a pattern the
788 // intrinsic was expecting to optimize. Should always be possible to
789 // get a normal java call that may inline in that case
790 cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type, /* allow_intrinsics= */ false);
791 new_jvms = cg->generate(jvms);
792 if (new_jvms == nullptr) {
793 guarantee(failing(), "call failed to generate: calls should work");
794 return;
795 }
796 }
797
798 if (cg->is_inline()) {
799 // Accumulate has_loops estimate
800 C->env()->notice_inlined_method(cg->method());
801 }
802
803 // Reset parser state from [new_]jvms, which now carries results of the call.
804 // Return value (if any) is already pushed on the stack by the cg.
805 add_exception_states_from(new_jvms);
806 if (new_jvms->map()->control() == top()) {
807 stop_and_kill_map();
808 } else {
809 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
810 set_jvms(new_jvms);
811 }
812
813 assert(check_call_consistency(jvms, cg), "inconsistent info");
814
815 if (!stopped()) {
816 // This was some sort of virtual call, which did a null check for us.
817 // Now we can assert receiver-not-null, on the normal return path.
818 if (receiver != nullptr && cg->is_virtual()) {
819 Node* cast = cast_not_null(receiver);
820 // %%% assert(receiver == cast, "should already have cast the receiver");
821 }
822
823 ciType* rtype = cg->method()->return_type();
824 ciType* ctype = declared_signature->return_type();
825
826 if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) {
827 // Be careful here with return types.
828 if (ctype != rtype) {
829 BasicType rt = rtype->basic_type();
830 BasicType ct = ctype->basic_type();
831 if (ct == T_VOID) {
832 // It's OK for a method to return a value that is discarded.
833 // The discarding does not require any special action from the caller.
834 // The Java code knows this, at VerifyType.isNullConversion.
835 pop_node(rt); // whatever it was, pop it
836 } else if (rt == T_INT || is_subword_type(rt)) {
837 // Nothing. These cases are handled in lambda form bytecode.
838 assert(ct == T_INT || is_subword_type(ct), "must match: rt=%s, ct=%s", type2name(rt), type2name(ct));
839 } else if (is_reference_type(rt)) {
840 assert(is_reference_type(ct), "rt=%s, ct=%s", type2name(rt), type2name(ct));
841 if (ctype->is_loaded()) {
842 const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass());
843 const Type* sig_type = TypeOopPtr::make_from_klass(ctype->as_klass());
844 if (arg_type != nullptr && !arg_type->higher_equal(sig_type)) {
845 Node* retnode = pop();
846 Node* cast_obj = _gvn.transform(new CheckCastPPNode(control(), retnode, sig_type));
847 push(cast_obj);
848 }
849 }
850 } else {
851 assert(rt == ct, "unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct));
852 // push a zero; it's better than getting an oop/int mismatch
853 pop_node(rt);
854 Node* retnode = zerocon(ct);
855 push_node(ct, retnode);
856 }
857 // Now that the value is well-behaved, continue with the call-site type.
858 rtype = ctype;
859 }
860 } else {
861 // Symbolic resolution enforces the types to be the same.
862 // NOTE: We must relax the assert for unloaded types because two
863 // different ciType instances of the same unloaded class type
864 // can appear to be "loaded" by different loaders (depending on
865 // the accessing class).
866 assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype,
867 "mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name());
868 }
869
870 // If the return type of the method is not loaded, assert that the
871 // value we got is a null. Otherwise, we need to recompile.
872 if (!rtype->is_loaded()) {
873 if (PrintOpto && (Verbose || WizardMode)) {
874 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
875 cg->method()->print_name(); tty->cr();
876 }
877 if (C->log() != nullptr) {
878 C->log()->elem("assert_null reason='return' klass='%d'",
879 C->log()->identify(rtype));
880 }
881 // If there is going to be a trap, put it at the next bytecode:
882 set_bci(iter().next_bci());
883 null_assert(peek());
884 set_bci(iter().cur_bci()); // put it back
885 }
886 BasicType ct = ctype->basic_type();
887 if (is_reference_type(ct)) {
888 record_profiled_return_for_speculation();
889 }
890
891 if (!rtype->is_void() && cg->method()->intrinsic_id() != vmIntrinsicID::_makePrivateBuffer) {
892 Node* retnode = peek();
893 const Type* rettype = gvn().type(retnode);
894 if (rettype->is_inlinetypeptr() && !retnode->is_InlineType()) {
895 retnode = InlineTypeNode::make_from_oop(this, retnode, rettype->inline_klass());
896 dec_sp(1);
897 push(retnode);
898 }
899 }
900
901 if (cg->method()->is_object_constructor() && receiver != nullptr && gvn().type(receiver)->is_inlinetypeptr()) {
902 InlineTypeNode* non_larval = InlineTypeNode::make_from_oop(this, receiver, gvn().type(receiver)->inline_klass());
903 // Relinquish the oop input, we will delay the allocation to the point it is needed, see the
904 // comments in InlineTypeNode::Ideal for more details
905 non_larval = non_larval->clone_if_required(&gvn(), nullptr);
906 non_larval->set_oop(gvn(), null());
907 non_larval->set_is_buffered(gvn(), false);
908 non_larval = gvn().transform(non_larval)->as_InlineType();
909 map()->replace_edge(receiver, non_larval);
910 }
911 }
912
913 // Restart record of parsing work after possible inlining of call
914 #ifndef PRODUCT
915 parse_histogram()->set_initial_state(bc());
916 #endif
917 }
918
919 //---------------------------catch_call_exceptions-----------------------------
920 // Put a Catch and CatchProj nodes behind a just-created call.
921 // Send their caught exceptions to the proper handler.
922 // This may be used after a call to the rethrow VM stub,
923 // when it is needed to process unloaded exception classes.
924 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
925 // Exceptions are delivered through this channel:
926 Node* i_o = this->i_o();
927
928 // Add a CatchNode.
929 Arena tmp_mem{mtCompiler};
930 GrowableArray<int> bcis(&tmp_mem, 8, 0, -1);
931 GrowableArray<const Type*> extypes(&tmp_mem, 8, 0, nullptr);
932 GrowableArray<int> saw_unloaded(&tmp_mem, 8, 0, -1);
933
934 bool default_handler = false;
935 for (; !handlers.is_done(); handlers.next()) {
936 ciExceptionHandler* h = handlers.handler();
937 int h_bci = h->handler_bci();
938 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
939 // Do not introduce unloaded exception types into the graph:
940 if (!h_klass->is_loaded()) {
941 if (saw_unloaded.contains(h_bci)) {
942 /* We've already seen an unloaded exception with h_bci,
943 so don't duplicate. Duplication will cause the CatchNode to be
944 unnecessarily large. See 4713716. */
945 continue;
946 } else {
947 saw_unloaded.append(h_bci);
948 }
949 }
950 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass);
951 // (We use make_from_klass because it respects UseUniqueSubclasses.)
952 h_extype = h_extype->join(TypeInstPtr::NOTNULL);
953 assert(!h_extype->empty(), "sanity");
954 // Note: It's OK if the BCIs repeat themselves.
955 bcis.append(h_bci);
956 extypes.append(h_extype);
957 if (h_bci == -1) {
958 default_handler = true;
959 }
960 }
961
962 if (!default_handler) {
963 bcis.append(-1);
964 const Type* extype = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
965 extype = extype->join(TypeInstPtr::NOTNULL);
966 extypes.append(extype);
967 }
968
969 int len = bcis.length();
970 CatchNode *cn = new CatchNode(control(), i_o, len+1);
971 Node *catch_ = _gvn.transform(cn);
972
973 // now branch with the exception state to each of the (potential)
974 // handlers
975 for(int i=0; i < len; i++) {
976 // Setup JVM state to enter the handler.
977 PreserveJVMState pjvms(this);
978 // Locals are just copied from before the call.
979 // Get control from the CatchNode.
980 int handler_bci = bcis.at(i);
981 Node* ctrl = _gvn.transform( new CatchProjNode(catch_, i+1,handler_bci));
982 // This handler cannot happen?
983 if (ctrl == top()) continue;
984 set_control(ctrl);
985
986 // Create exception oop
987 const TypeInstPtr* extype = extypes.at(i)->is_instptr();
988 Node* ex_oop = _gvn.transform(new CreateExNode(extypes.at(i), ctrl, i_o));
989
990 // Handle unloaded exception classes.
991 if (saw_unloaded.contains(handler_bci)) {
992 // An unloaded exception type is coming here. Do an uncommon trap.
993 #ifndef PRODUCT
994 // We do not expect the same handler bci to take both cold unloaded
995 // and hot loaded exceptions. But, watch for it.
996 if (PrintOpto && (Verbose || WizardMode) && extype->is_loaded()) {
997 tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci());
998 method()->print_name(); tty->cr();
999 } else if (PrintOpto && (Verbose || WizardMode)) {
1000 tty->print("Bailing out on unloaded exception type ");
1001 extype->instance_klass()->print_name();
1002 tty->print(" at bci:%d in ", bci());
1003 method()->print_name(); tty->cr();
1004 }
1005 #endif
1006 // Emit an uncommon trap instead of processing the block.
1007 set_bci(handler_bci);
1008 push_ex_oop(ex_oop);
1009 uncommon_trap(Deoptimization::Reason_unloaded,
1010 Deoptimization::Action_reinterpret,
1011 extype->instance_klass(), "!loaded exception");
1012 set_bci(iter().cur_bci()); // put it back
1013 continue;
1014 }
1015
1016 // go to the exception handler
1017 if (handler_bci < 0) { // merge with corresponding rethrow node
1018 throw_to_exit(make_exception_state(ex_oop));
1019 } else { // Else jump to corresponding handle
1020 push_ex_oop(ex_oop); // Clear stack and push just the oop.
1021 merge_exception(handler_bci);
1022 }
1023 }
1024
1025 // The first CatchProj is for the normal return.
1026 // (Note: If this is a call to rethrow_Java, this node goes dead.)
1027 set_control(_gvn.transform( new CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
1028 }
1029
1030
1031 //----------------------------catch_inline_exceptions--------------------------
1032 // Handle all exceptions thrown by an inlined method or individual bytecode.
1033 // Common case 1: we have no handler, so all exceptions merge right into
1034 // the rethrow case.
1035 // Case 2: we have some handlers, with loaded exception klasses that have
1036 // no subklasses. We do a Deutsch-Schiffman style type-check on the incoming
1037 // exception oop and branch to the handler directly.
1038 // Case 3: We have some handlers with subklasses or are not loaded at
1039 // compile-time. We have to call the runtime to resolve the exception.
1040 // So we insert a RethrowCall and all the logic that goes with it.
1041 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
1042 // Caller is responsible for saving away the map for normal control flow!
1043 assert(stopped(), "call set_map(nullptr) first");
1044 assert(method()->has_exception_handlers(), "don't come here w/o work to do");
1045
1046 Node* ex_node = saved_ex_oop(ex_map);
1047 if (ex_node == top()) {
1048 // No action needed.
1049 return;
1050 }
1051 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
1052 NOT_PRODUCT(if (ex_type==nullptr) tty->print_cr("*** Exception not InstPtr"));
1053 if (ex_type == nullptr)
1054 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
1055
1056 // determine potential exception handlers
1057 ciExceptionHandlerStream handlers(method(), bci(),
1058 ex_type->instance_klass(),
1059 ex_type->klass_is_exact());
1060
1061 // Start executing from the given throw state. (Keep its stack, for now.)
1062 // Get the exception oop as known at compile time.
1063 ex_node = use_exception_state(ex_map);
1064
1065 // Get the exception oop klass from its header
1066 Node* ex_klass_node = nullptr;
1067 if (has_exception_handler() && !ex_type->klass_is_exact()) {
1068 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
1069 ex_klass_node = _gvn.transform(LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
1070
1071 // Compute the exception klass a little more cleverly.
1072 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
1073 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
1074 // each arm of the Phi. If I know something clever about the exceptions
1075 // I'm loading the class from, I can replace the LoadKlass with the
1076 // klass constant for the exception oop.
1077 if (ex_node->is_Phi()) {
1078 ex_klass_node = new PhiNode(ex_node->in(0), TypeInstKlassPtr::OBJECT);
1079 for (uint i = 1; i < ex_node->req(); i++) {
1080 Node* ex_in = ex_node->in(i);
1081 if (ex_in == top() || ex_in == nullptr) {
1082 // This path was not taken.
1083 ex_klass_node->init_req(i, top());
1084 continue;
1085 }
1086 Node* p = basic_plus_adr(ex_in, ex_in, oopDesc::klass_offset_in_bytes());
1087 Node* k = _gvn.transform(LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
1088 ex_klass_node->init_req( i, k );
1089 }
1090 ex_klass_node = _gvn.transform(ex_klass_node);
1091 }
1092 }
1093
1094 // Scan the exception table for applicable handlers.
1095 // If none, we can call rethrow() and be done!
1096 // If precise (loaded with no subklasses), insert a D.S. style
1097 // pointer compare to the correct handler and loop back.
1098 // If imprecise, switch to the Rethrow VM-call style handling.
1099
1100 int remaining = handlers.count_remaining();
1101
1102 // iterate through all entries sequentially
1103 for (;!handlers.is_done(); handlers.next()) {
1104 ciExceptionHandler* handler = handlers.handler();
1105
1106 if (handler->is_rethrow()) {
1107 // If we fell off the end of the table without finding an imprecise
1108 // exception klass (and without finding a generic handler) then we
1109 // know this exception is not handled in this method. We just rethrow
1110 // the exception into the caller.
1111 throw_to_exit(make_exception_state(ex_node));
1112 return;
1113 }
1114
1115 // exception handler bci range covers throw_bci => investigate further
1116 int handler_bci = handler->handler_bci();
1117
1118 if (remaining == 1) {
1119 push_ex_oop(ex_node); // Push exception oop for handler
1120 if (PrintOpto && WizardMode) {
1121 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
1122 }
1123 // If this is a backwards branch in the bytecodes, add safepoint
1124 maybe_add_safepoint(handler_bci);
1125 merge_exception(handler_bci); // jump to handler
1126 return; // No more handling to be done here!
1127 }
1128
1129 // Get the handler's klass
1130 ciInstanceKlass* klass = handler->catch_klass();
1131
1132 if (!klass->is_loaded()) { // klass is not loaded?
1133 // fall through into catch_call_exceptions which will emit a
1134 // handler with an uncommon trap.
1135 break;
1136 }
1137
1138 if (klass->is_interface()) // should not happen, but...
1139 break; // bail out
1140
1141 // Check the type of the exception against the catch type
1142 const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
1143 Node* con = _gvn.makecon(tk);
1144 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
1145 if (!stopped()) {
1146 PreserveJVMState pjvms(this);
1147 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
1148 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
1149 Node* ex_oop = _gvn.transform(new CheckCastPPNode(control(), ex_node, tinst));
1150 push_ex_oop(ex_oop); // Push exception oop for handler
1151 if (PrintOpto && WizardMode) {
1152 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
1153 klass->print_name();
1154 tty->cr();
1155 }
1156 // If this is a backwards branch in the bytecodes, add safepoint
1157 maybe_add_safepoint(handler_bci);
1158 merge_exception(handler_bci);
1159 }
1160 set_control(not_subtype_ctrl);
1161
1162 // Come here if exception does not match handler.
1163 // Carry on with more handler checks.
1164 --remaining;
1165 }
1166
1167 assert(!stopped(), "you should return if you finish the chain");
1168
1169 // Oops, need to call into the VM to resolve the klasses at runtime.
1170 kill_dead_locals();
1171
1172 { PreserveReexecuteState preexecs(this);
1173 // When throwing an exception, set the reexecute flag for deoptimization.
1174 // This is mostly needed to pass -XX:+VerifyStack sanity checks.
1175 jvms()->set_should_reexecute(true);
1176
1177 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
1178 OptoRuntime::rethrow_Type(),
1179 OptoRuntime::rethrow_stub(),
1180 nullptr, nullptr,
1181 ex_node);
1182 }
1183
1184 // Rethrow is a pure call, no side effects, only a result.
1185 // The result cannot be allocated, so we use I_O
1186
1187 // Catch exceptions from the rethrow
1188 catch_call_exceptions(handlers);
1189 }
1190
1191
1192 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.)
1193
1194
1195 #ifndef PRODUCT
1196 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
1197 if( CountCompiledCalls ) {
1198 if( at_method_entry ) {
1199 // bump invocation counter if top method (for statistics)
1200 if (CountCompiledCalls && depth() == 1) {
1201 const TypePtr* addr_type = TypeMetadataPtr::make(method());
1202 Node* adr1 = makecon(addr_type);
1203 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset()));
1204 increment_counter(adr2);
1205 }
1206 } else if (is_inline) {
1207 switch (bc()) {
1208 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
1209 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
1210 case Bytecodes::_invokestatic:
1211 case Bytecodes::_invokedynamic:
1212 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
1213 default: fatal("unexpected call bytecode");
1214 }
1215 } else {
1216 switch (bc()) {
1217 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
1218 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
1219 case Bytecodes::_invokestatic:
1220 case Bytecodes::_invokedynamic:
1221 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break;
1222 default: fatal("unexpected call bytecode");
1223 }
1224 }
1225 }
1226 }
1227 #endif //PRODUCT
1228
1229
1230 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, ciInstanceKlass* klass,
1231 ciKlass* holder, ciMethod* callee,
1232 const TypeOopPtr* receiver_type, bool is_virtual,
1233 bool& call_does_dispatch, int& vtable_index,
1234 bool check_access) {
1235 // Set default values for out-parameters.
1236 call_does_dispatch = true;
1237 vtable_index = Method::invalid_vtable_index;
1238
1239 // Choose call strategy.
1240 ciMethod* optimized_virtual_method = optimize_inlining(caller, klass, holder, callee,
1241 receiver_type, check_access);
1242
1243 // Have the call been sufficiently improved such that it is no longer a virtual?
1244 if (optimized_virtual_method != nullptr) {
1245 callee = optimized_virtual_method;
1246 call_does_dispatch = false;
1247 } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) {
1248 // We can make a vtable call at this site
1249 vtable_index = callee->resolve_vtable_index(caller->holder(), holder);
1250 }
1251 return callee;
1252 }
1253
1254 // Identify possible target method and inlining style
1255 ciMethod* Compile::optimize_inlining(ciMethod* caller, ciInstanceKlass* klass, ciKlass* holder,
1256 ciMethod* callee, const TypeOopPtr* receiver_type,
1257 bool check_access) {
1258 // only use for virtual or interface calls
1259
1260 // If it is obviously final, do not bother to call find_monomorphic_target,
1261 // because the class hierarchy checks are not needed, and may fail due to
1262 // incompletely loaded classes. Since we do our own class loading checks
1263 // in this module, we may confidently bind to any method.
1264 if (callee->can_be_statically_bound()) {
1265 return callee;
1266 }
1267
1268 if (receiver_type == nullptr) {
1269 return nullptr; // no receiver type info
1270 }
1271
1272 // Attempt to improve the receiver
1273 bool actual_receiver_is_exact = false;
1274 ciInstanceKlass* actual_receiver = klass;
1275 // Array methods are all inherited from Object, and are monomorphic.
1276 // finalize() call on array is not allowed.
1277 if (receiver_type->isa_aryptr() &&
1278 callee->holder() == env()->Object_klass() &&
1279 callee->name() != ciSymbols::finalize_method_name()) {
1280 return callee;
1281 }
1282
1283 // All other interesting cases are instance klasses.
1284 if (!receiver_type->isa_instptr()) {
1285 return nullptr;
1286 }
1287
1288 ciInstanceKlass* receiver_klass = receiver_type->is_instptr()->instance_klass();
1289 if (receiver_klass->is_loaded() && receiver_klass->is_initialized() && !receiver_klass->is_interface() &&
1290 (receiver_klass == actual_receiver || receiver_klass->is_subtype_of(actual_receiver))) {
1291 // ikl is a same or better type than the original actual_receiver,
1292 // e.g. static receiver from bytecodes.
1293 actual_receiver = receiver_klass;
1294 // Is the actual_receiver exact?
1295 actual_receiver_is_exact = receiver_type->klass_is_exact();
1296 }
1297
1298 ciInstanceKlass* calling_klass = caller->holder();
1299 ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver, check_access);
1300
1301 if (cha_monomorphic_target != nullptr) {
1302 // Hardwiring a virtual.
1303 assert(!callee->can_be_statically_bound(), "should have been handled earlier");
1304 assert(!cha_monomorphic_target->is_abstract(), "");
1305 if (!cha_monomorphic_target->can_be_statically_bound(actual_receiver)) {
1306 // If we inlined because CHA revealed only a single target method,
1307 // then we are dependent on that target method not getting overridden
1308 // by dynamic class loading. Be sure to test the "static" receiver
1309 // dest_method here, as opposed to the actual receiver, which may
1310 // falsely lead us to believe that the receiver is final or private.
1311 dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target, holder, callee);
1312 }
1313 return cha_monomorphic_target;
1314 }
1315
1316 // If the type is exact, we can still bind the method w/o a vcall.
1317 // (This case comes after CHA so we can see how much extra work it does.)
1318 if (actual_receiver_is_exact) {
1319 // In case of evolution, there is a dependence on every inlined method, since each
1320 // such method can be changed when its class is redefined.
1321 ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver);
1322 if (exact_method != nullptr) {
1323 return exact_method;
1324 }
1325 }
1326
1327 return nullptr;
1328 }