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