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