1 /* 2 * Copyright (c) 1998, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "ci/ciCallSite.hpp" 27 #include "ci/ciMethodHandle.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "compiler/compileBroker.hpp" 30 #include "compiler/compileLog.hpp" 31 #include "interpreter/linkResolver.hpp" 32 #include "opto/addnode.hpp" 33 #include "opto/callGenerator.hpp" 34 #include "opto/castnode.hpp" 35 #include "opto/cfgnode.hpp" 36 #include "opto/mulnode.hpp" 37 #include "opto/parse.hpp" 38 #include "opto/rootnode.hpp" 39 #include "opto/runtime.hpp" 40 #include "opto/subnode.hpp" 41 #include "prims/nativeLookup.hpp" 42 #include "runtime/sharedRuntime.hpp" 43 44 void trace_type_profile(Compile* C, ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) { 45 if (TraceTypeProfile || C->print_inlining()) { 46 outputStream* out = tty; 47 if (!C->print_inlining()) { 48 if (!PrintOpto && !PrintCompilation) { 49 method->print_short_name(); 50 tty->cr(); 51 } 52 CompileTask::print_inlining_tty(prof_method, depth, bci); 53 } else { 54 out = C->print_inlining_stream(); 55 } 56 CompileTask::print_inline_indent(depth, out); 57 out->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count); 58 stringStream ss; 59 prof_klass->name()->print_symbol_on(&ss); 60 out->print("%s", ss.as_string()); 61 out->cr(); 62 } 63 } 64 65 CallGenerator* Compile::call_generator(ciMethod* callee, int vtable_index, bool call_does_dispatch, 66 JVMState* jvms, bool allow_inline, 67 float prof_factor, ciKlass* speculative_receiver_type, 68 bool allow_intrinsics, bool delayed_forbidden) { 69 ciMethod* caller = jvms->method(); 70 int bci = jvms->bci(); 71 Bytecodes::Code bytecode = caller->java_code_at_bci(bci); 72 guarantee(callee != NULL, "failed method resolution"); 73 74 // Dtrace currently doesn't work unless all calls are vanilla 75 if (env()->dtrace_method_probes()) { 76 allow_inline = false; 77 } 78 79 // Note: When we get profiling during stage-1 compiles, we want to pull 80 // from more specific profile data which pertains to this inlining. 81 // Right now, ignore the information in jvms->caller(), and do method[bci]. 82 ciCallProfile profile = caller->call_profile_at_bci(bci); 83 84 // See how many times this site has been invoked. 85 int site_count = profile.count(); 86 int receiver_count = -1; 87 if (call_does_dispatch && UseTypeProfile && profile.has_receiver(0)) { 88 // Receivers in the profile structure are ordered by call counts 89 // so that the most called (major) receiver is profile.receiver(0). 90 receiver_count = profile.receiver_count(0); 91 } 92 93 CompileLog* log = this->log(); 94 if (log != NULL) { 95 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1; 96 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1; 97 log->begin_elem("call method='%d' count='%d' prof_factor='%f'", 98 log->identify(callee), site_count, prof_factor); 99 if (call_does_dispatch) log->print(" virtual='1'"); 100 if (allow_inline) log->print(" inline='1'"); 101 if (receiver_count >= 0) { 102 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count); 103 if (profile.has_receiver(1)) { 104 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1)); 105 } 106 } 107 if (callee->is_method_handle_intrinsic()) { 108 log->print(" method_handle_intrinsic='1'"); 109 } 110 log->end_elem(); 111 } 112 113 // Special case the handling of certain common, profitable library 114 // methods. If these methods are replaced with specialized code, 115 // then we return it as the inlined version of the call. 116 // We do this before the strict f.p. check below because the 117 // intrinsics handle strict f.p. correctly. 118 CallGenerator* cg_intrinsic = NULL; 119 if (allow_inline && allow_intrinsics) { 120 CallGenerator* cg = find_intrinsic(callee, call_does_dispatch); 121 if (cg != NULL) { 122 if (cg->is_predicated()) { 123 // Code without intrinsic but, hopefully, inlined. 124 CallGenerator* inline_cg = this->call_generator(callee, 125 vtable_index, call_does_dispatch, jvms, allow_inline, prof_factor, speculative_receiver_type, false); 126 if (inline_cg != NULL) { 127 cg = CallGenerator::for_predicated_intrinsic(cg, inline_cg); 128 } 129 } 130 131 // If intrinsic does the virtual dispatch, we try to use the type profile 132 // first, and hopefully inline it as the regular virtual call below. 133 // We will retry the intrinsic if nothing had claimed it afterwards. 134 if (cg->does_virtual_dispatch()) { 135 cg_intrinsic = cg; 136 cg = NULL; 137 } else { 138 return cg; 139 } 140 } 141 } 142 143 // Do method handle calls. 144 // NOTE: This must happen before normal inlining logic below since 145 // MethodHandle.invoke* are native methods which obviously don't 146 // have bytecodes and so normal inlining fails. 147 if (callee->is_method_handle_intrinsic()) { 148 CallGenerator* cg = CallGenerator::for_method_handle_call(jvms, caller, callee, delayed_forbidden); 149 assert(cg == NULL || !delayed_forbidden || !cg->is_late_inline() || cg->is_mh_late_inline(), "unexpected CallGenerator"); 150 return cg; 151 } 152 153 // Do not inline strict fp into non-strict code, or the reverse 154 if (caller->is_strict() ^ callee->is_strict()) { 155 allow_inline = false; 156 } 157 158 // Attempt to inline... 159 if (allow_inline) { 160 // The profile data is only partly attributable to this caller, 161 // scale back the call site information. 162 float past_uses = jvms->method()->scale_count(site_count, prof_factor); 163 // This is the number of times we expect the call code to be used. 164 float expected_uses = past_uses; 165 166 // Try inlining a bytecoded method: 167 if (!call_does_dispatch) { 168 InlineTree* ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method()); 169 WarmCallInfo scratch_ci; 170 bool should_delay = false; 171 WarmCallInfo* ci = ilt->ok_to_inline(callee, jvms, profile, &scratch_ci, should_delay); 172 assert(ci != &scratch_ci, "do not let this pointer escape"); 173 bool allow_inline = (ci != NULL && !ci->is_cold()); 174 bool require_inline = (allow_inline && ci->is_hot()); 175 176 if (allow_inline) { 177 CallGenerator* cg = CallGenerator::for_inline(callee, expected_uses); 178 179 if (require_inline && cg != NULL) { 180 // Delay the inlining of this method to give us the 181 // opportunity to perform some high level optimizations 182 // first. 183 if (should_delay_string_inlining(callee, jvms)) { 184 assert(!delayed_forbidden, "strange"); 185 return CallGenerator::for_string_late_inline(callee, cg); 186 } else if (should_delay_boxing_inlining(callee, jvms)) { 187 assert(!delayed_forbidden, "strange"); 188 return CallGenerator::for_boxing_late_inline(callee, cg); 189 } else if ((should_delay || AlwaysIncrementalInline) && !delayed_forbidden) { 190 return CallGenerator::for_late_inline(callee, cg); 191 } 192 } 193 if (cg == NULL || should_delay) { 194 // Fall through. 195 } else if (require_inline || !InlineWarmCalls) { 196 return cg; 197 } else { 198 CallGenerator* cold_cg = call_generator(callee, vtable_index, call_does_dispatch, jvms, false, prof_factor); 199 return CallGenerator::for_warm_call(ci, cold_cg, cg); 200 } 201 } 202 } 203 204 // Try using the type profile. 205 if (call_does_dispatch && site_count > 0 && receiver_count > 0) { 206 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count. 207 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent); 208 ciMethod* receiver_method = NULL; 209 210 int morphism = profile.morphism(); 211 if (speculative_receiver_type != NULL) { 212 if (!too_many_traps(caller, bci, Deoptimization::Reason_speculate_class_check)) { 213 // We have a speculative type, we should be able to resolve 214 // the call. We do that before looking at the profiling at 215 // this invoke because it may lead to bimorphic inlining which 216 // a speculative type should help us avoid. 217 receiver_method = callee->resolve_invoke(jvms->method()->holder(), 218 speculative_receiver_type); 219 if (receiver_method == NULL) { 220 speculative_receiver_type = NULL; 221 } else { 222 morphism = 1; 223 } 224 } else { 225 // speculation failed before. Use profiling at the call 226 // (could allow bimorphic inlining for instance). 227 speculative_receiver_type = NULL; 228 } 229 } 230 if (receiver_method == NULL && 231 (have_major_receiver || morphism == 1 || 232 (morphism == 2 && UseBimorphicInlining))) { 233 // receiver_method = profile.method(); 234 // Profiles do not suggest methods now. Look it up in the major receiver. 235 receiver_method = callee->resolve_invoke(jvms->method()->holder(), 236 profile.receiver(0)); 237 } 238 if (receiver_method != NULL) { 239 // The single majority receiver sufficiently outweighs the minority. 240 CallGenerator* hit_cg = this->call_generator(receiver_method, 241 vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor); 242 if (hit_cg != NULL) { 243 // Look up second receiver. 244 CallGenerator* next_hit_cg = NULL; 245 ciMethod* next_receiver_method = NULL; 246 if (morphism == 2 && UseBimorphicInlining) { 247 next_receiver_method = callee->resolve_invoke(jvms->method()->holder(), 248 profile.receiver(1)); 249 if (next_receiver_method != NULL) { 250 next_hit_cg = this->call_generator(next_receiver_method, 251 vtable_index, !call_does_dispatch, jvms, 252 allow_inline, prof_factor); 253 if (next_hit_cg != NULL && !next_hit_cg->is_inline() && 254 have_major_receiver && UseOnlyInlinedBimorphic) { 255 // Skip if we can't inline second receiver's method 256 next_hit_cg = NULL; 257 } 258 } 259 } 260 CallGenerator* miss_cg; 261 Deoptimization::DeoptReason reason = morphism == 2 ? 262 Deoptimization::Reason_bimorphic : Deoptimization::reason_class_check(speculative_receiver_type != NULL); 263 if ((morphism == 1 || (morphism == 2 && next_hit_cg != NULL)) && 264 !too_many_traps(caller, bci, reason) 265 ) { 266 // Generate uncommon trap for class check failure path 267 // in case of monomorphic or bimorphic virtual call site. 268 miss_cg = CallGenerator::for_uncommon_trap(callee, reason, 269 Deoptimization::Action_maybe_recompile); 270 } else { 271 // Generate virtual call for class check failure path 272 // in case of polymorphic virtual call site. 273 miss_cg = CallGenerator::for_virtual_call(callee, vtable_index); 274 } 275 if (miss_cg != NULL) { 276 if (next_hit_cg != NULL) { 277 assert(speculative_receiver_type == NULL, "shouldn't end up here if we used speculation"); 278 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1)); 279 // We don't need to record dependency on a receiver here and below. 280 // Whenever we inline, the dependency is added by Parse::Parse(). 281 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX); 282 } 283 if (miss_cg != NULL) { 284 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count); 285 ciKlass* k = speculative_receiver_type != NULL ? speculative_receiver_type : profile.receiver(0); 286 float hit_prob = speculative_receiver_type != NULL ? 1.0 : profile.receiver_prob(0); 287 CallGenerator* cg = CallGenerator::for_predicted_call(k, miss_cg, hit_cg, hit_prob); 288 if (cg != NULL) return cg; 289 } 290 } 291 } 292 } 293 } 294 } 295 296 // Nothing claimed the intrinsic, we go with straight-forward inlining 297 // for already discovered intrinsic. 298 if (allow_inline && allow_intrinsics && cg_intrinsic != NULL) { 299 assert(cg_intrinsic->does_virtual_dispatch(), "sanity"); 300 return cg_intrinsic; 301 } 302 303 // There was no special inlining tactic, or it bailed out. 304 // Use a more generic tactic, like a simple call. 305 if (call_does_dispatch) { 306 const char* msg = "virtual call"; 307 if (PrintInlining) print_inlining(callee, jvms->depth() - 1, jvms->bci(), msg); 308 C->log_inline_failure(msg); 309 return CallGenerator::for_virtual_call(callee, vtable_index); 310 } else { 311 // Class Hierarchy Analysis or Type Profile reveals a unique target, 312 // or it is a static or special call. 313 return CallGenerator::for_direct_call(callee, should_delay_inlining(callee, jvms)); 314 } 315 } 316 317 // Return true for methods that shouldn't be inlined early so that 318 // they are easier to analyze and optimize as intrinsics. 319 bool Compile::should_delay_string_inlining(ciMethod* call_method, JVMState* jvms) { 320 if (has_stringbuilder()) { 321 322 if ((call_method->holder() == C->env()->StringBuilder_klass() || 323 call_method->holder() == C->env()->StringBuffer_klass()) && 324 (jvms->method()->holder() == C->env()->StringBuilder_klass() || 325 jvms->method()->holder() == C->env()->StringBuffer_klass())) { 326 // Delay SB calls only when called from non-SB code 327 return false; 328 } 329 330 switch (call_method->intrinsic_id()) { 331 case vmIntrinsics::_StringBuilder_void: 332 case vmIntrinsics::_StringBuilder_int: 333 case vmIntrinsics::_StringBuilder_String: 334 case vmIntrinsics::_StringBuilder_append_char: 335 case vmIntrinsics::_StringBuilder_append_int: 336 case vmIntrinsics::_StringBuilder_append_String: 337 case vmIntrinsics::_StringBuilder_toString: 338 case vmIntrinsics::_StringBuffer_void: 339 case vmIntrinsics::_StringBuffer_int: 340 case vmIntrinsics::_StringBuffer_String: 341 case vmIntrinsics::_StringBuffer_append_char: 342 case vmIntrinsics::_StringBuffer_append_int: 343 case vmIntrinsics::_StringBuffer_append_String: 344 case vmIntrinsics::_StringBuffer_toString: 345 case vmIntrinsics::_Integer_toString: 346 return true; 347 348 case vmIntrinsics::_String_String: 349 { 350 Node* receiver = jvms->map()->in(jvms->argoff() + 1); 351 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) { 352 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava(); 353 ciMethod* m = csj->method(); 354 if (m != NULL && 355 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString || 356 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString)) 357 // Delay String.<init>(new SB()) 358 return true; 359 } 360 return false; 361 } 362 363 default: 364 return false; 365 } 366 } 367 return false; 368 } 369 370 bool Compile::should_delay_boxing_inlining(ciMethod* call_method, JVMState* jvms) { 371 if (eliminate_boxing() && call_method->is_boxing_method()) { 372 set_has_boxed_value(true); 373 return aggressive_unboxing(); 374 } 375 return false; 376 } 377 378 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link 379 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) { 380 // Additional inputs to consider... 381 // bc = bc() 382 // caller = method() 383 // iter().get_method_holder_index() 384 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" ); 385 // Interface classes can be loaded & linked and never get around to 386 // being initialized. Uncommon-trap for not-initialized static or 387 // v-calls. Let interface calls happen. 388 ciInstanceKlass* holder_klass = dest_method->holder(); 389 if (!holder_klass->is_being_initialized() && 390 !holder_klass->is_initialized() && 391 !holder_klass->is_interface()) { 392 uncommon_trap(Deoptimization::Reason_uninitialized, 393 Deoptimization::Action_reinterpret, 394 holder_klass); 395 return true; 396 } 397 398 assert(dest_method->is_loaded(), "dest_method: typeflow responsibility"); 399 return false; 400 } 401 402 #ifdef ASSERT 403 static bool check_call_consistency(JVMState* jvms, CallGenerator* cg) { 404 ciMethod* symbolic_info = jvms->method()->get_method_at_bci(jvms->bci()); 405 ciMethod* resolved_method = cg->method(); 406 if (!ciMethod::is_consistent_info(symbolic_info, resolved_method)) { 407 tty->print_cr("JVMS:"); 408 jvms->dump(); 409 tty->print_cr("Bytecode info:"); 410 jvms->method()->get_method_at_bci(jvms->bci())->print(); tty->cr(); 411 tty->print_cr("Resolved method:"); 412 cg->method()->print(); tty->cr(); 413 return false; 414 } 415 return true; 416 } 417 #endif // ASSERT 418 419 //------------------------------do_call---------------------------------------- 420 // Handle your basic call. Inline if we can & want to, else just setup call. 421 void Parse::do_call() { 422 // It's likely we are going to add debug info soon. 423 // Also, if we inline a guy who eventually needs debug info for this JVMS, 424 // our contribution to it is cleaned up right here. 425 kill_dead_locals(); 426 427 C->print_inlining_assert_ready(); 428 429 // Set frequently used booleans 430 const bool is_virtual = bc() == Bytecodes::_invokevirtual; 431 const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface; 432 const bool has_receiver = Bytecodes::has_receiver(bc()); 433 434 // Find target being called 435 bool will_link; 436 ciSignature* declared_signature = NULL; 437 ciMethod* orig_callee = iter().get_method(will_link, &declared_signature); // callee in the bytecode 438 ciInstanceKlass* holder_klass = orig_callee->holder(); 439 ciKlass* holder = iter().get_declared_method_holder(); 440 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder); 441 assert(declared_signature != NULL, "cannot be null"); 442 443 // Bump max node limit for JSR292 users 444 if (bc() == Bytecodes::_invokedynamic || orig_callee->is_method_handle_intrinsic()) { 445 C->set_max_node_limit(3*MaxNodeLimit); 446 } 447 448 // uncommon-trap when callee is unloaded, uninitialized or will not link 449 // bailout when too many arguments for register representation 450 if (!will_link || can_not_compile_call_site(orig_callee, klass)) { 451 if (PrintOpto && (Verbose || WizardMode)) { 452 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci()); 453 orig_callee->print_name(); tty->cr(); 454 } 455 return; 456 } 457 assert(holder_klass->is_loaded(), ""); 458 //assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); // XXX invokehandle (cur_bc_raw) 459 // Note: this takes into account invokeinterface of methods declared in java/lang/Object, 460 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces 461 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc"); 462 // Note: In the absence of miranda methods, an abstract class K can perform 463 // an invokevirtual directly on an interface method I.m if K implements I. 464 465 // orig_callee is the resolved callee which's signature includes the 466 // appendix argument. 467 const int nargs = orig_callee->arg_size(); 468 const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id()); 469 470 // Push appendix argument (MethodType, CallSite, etc.), if one. 471 if (iter().has_appendix()) { 472 ciObject* appendix_arg = iter().get_appendix(); 473 const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg); 474 Node* appendix_arg_node = _gvn.makecon(appendix_arg_type); 475 push(appendix_arg_node); 476 } 477 478 // --------------------- 479 // Does Class Hierarchy Analysis reveal only a single target of a v-call? 480 // Then we may inline or make a static call, but become dependent on there being only 1 target. 481 // Does the call-site type profile reveal only one receiver? 482 // Then we may introduce a run-time check and inline on the path where it succeeds. 483 // The other path may uncommon_trap, check for another receiver, or do a v-call. 484 485 // Try to get the most accurate receiver type 486 ciMethod* callee = orig_callee; 487 int vtable_index = Method::invalid_vtable_index; 488 bool call_does_dispatch = false; 489 490 // Speculative type of the receiver if any 491 ciKlass* speculative_receiver_type = NULL; 492 if (is_virtual_or_interface) { 493 Node* receiver_node = stack(sp() - nargs); 494 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr(); 495 // call_does_dispatch and vtable_index are out-parameters. They might be changed. 496 // For arrays, klass below is Object. When vtable calls are used, 497 // resolving the call with Object would allow an illegal call to 498 // finalize() on an array. We use holder instead: illegal calls to 499 // finalize() won't be compiled as vtable calls (IC call 500 // resolution will catch the illegal call) and the few legal calls 501 // on array types won't be either. 502 callee = C->optimize_virtual_call(method(), bci(), klass, holder, orig_callee, 503 receiver_type, is_virtual, 504 call_does_dispatch, vtable_index); // out-parameters 505 speculative_receiver_type = receiver_type != NULL ? receiver_type->speculative_type() : NULL; 506 } 507 508 // invoke-super-special 509 if (iter().cur_bc_raw() == Bytecodes::_invokespecial && !orig_callee->is_object_initializer()) { 510 ciInstanceKlass* calling_klass = method()->holder(); 511 ciInstanceKlass* sender_klass = 512 calling_klass->is_anonymous() ? calling_klass->host_klass() : 513 calling_klass; 514 if (sender_klass->is_interface()) { 515 Node* receiver_node = stack(sp() - nargs); 516 Node* cls_node = makecon(TypeKlassPtr::make(sender_klass)); 517 Node* bad_type_ctrl = NULL; 518 Node* casted_receiver = gen_checkcast(receiver_node, cls_node, &bad_type_ctrl); 519 if (bad_type_ctrl != NULL) { 520 PreserveJVMState pjvms(this); 521 set_control(bad_type_ctrl); 522 uncommon_trap(Deoptimization::Reason_class_check, 523 Deoptimization::Action_none); 524 } 525 if (stopped()) { 526 return; // MUST uncommon-trap? 527 } 528 set_stack(sp() - nargs, casted_receiver); 529 } 530 } 531 532 // Note: It's OK to try to inline a virtual call. 533 // The call generator will not attempt to inline a polymorphic call 534 // unless it knows how to optimize the receiver dispatch. 535 bool try_inline = (C->do_inlining() || InlineAccessors); 536 537 // --------------------- 538 dec_sp(nargs); // Temporarily pop args for JVM state of call 539 JVMState* jvms = sync_jvms(); 540 541 // --------------------- 542 // Decide call tactic. 543 // This call checks with CHA, the interpreter profile, intrinsics table, etc. 544 // It decides whether inlining is desirable or not. 545 CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type); 546 547 // NOTE: Don't use orig_callee and callee after this point! Use cg->method() instead. 548 orig_callee = callee = NULL; 549 550 // --------------------- 551 // Round double arguments before call 552 round_double_arguments(cg->method()); 553 554 // Feed profiling data for arguments to the type system so it can 555 // propagate it as speculative types 556 record_profiled_arguments_for_speculation(cg->method(), bc()); 557 558 #ifndef PRODUCT 559 // bump global counters for calls 560 count_compiled_calls(/*at_method_entry*/ false, cg->is_inline()); 561 562 // Record first part of parsing work for this call 563 parse_histogram()->record_change(); 564 #endif // not PRODUCT 565 566 assert(jvms == this->jvms(), "still operating on the right JVMS"); 567 assert(jvms_in_sync(), "jvms must carry full info into CG"); 568 569 // save across call, for a subsequent cast_not_null. 570 Node* receiver = has_receiver ? argument(0) : NULL; 571 572 // The extra CheckCastPP for speculative types mess with PhaseStringOpts 573 if (receiver != NULL && !call_does_dispatch && !cg->is_string_late_inline()) { 574 // Feed profiling data for a single receiver to the type system so 575 // it can propagate it as a speculative type 576 receiver = record_profiled_receiver_for_speculation(receiver); 577 } 578 579 // Bump method data counters (We profile *before* the call is made 580 // because exceptions don't return to the call site.) 581 profile_call(receiver); 582 583 JVMState* new_jvms = cg->generate(jvms); 584 if (new_jvms == NULL) { 585 // When inlining attempt fails (e.g., too many arguments), 586 // it may contaminate the current compile state, making it 587 // impossible to pull back and try again. Once we call 588 // cg->generate(), we are committed. If it fails, the whole 589 // compilation task is compromised. 590 if (failing()) return; 591 592 // This can happen if a library intrinsic is available, but refuses 593 // the call site, perhaps because it did not match a pattern the 594 // intrinsic was expecting to optimize. Should always be possible to 595 // get a normal java call that may inline in that case 596 cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type, /* allow_intrinsics= */ false); 597 new_jvms = cg->generate(jvms); 598 if (new_jvms == NULL) { 599 guarantee(failing(), "call failed to generate: calls should work"); 600 return; 601 } 602 } 603 604 if (cg->is_inline()) { 605 // Accumulate has_loops estimate 606 C->set_has_loops(C->has_loops() || cg->method()->has_loops()); 607 C->env()->notice_inlined_method(cg->method()); 608 } 609 610 // Reset parser state from [new_]jvms, which now carries results of the call. 611 // Return value (if any) is already pushed on the stack by the cg. 612 add_exception_states_from(new_jvms); 613 if (new_jvms->map()->control() == top()) { 614 stop_and_kill_map(); 615 } else { 616 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged"); 617 set_jvms(new_jvms); 618 } 619 620 assert(check_call_consistency(jvms, cg), "inconsistent info"); 621 622 if (!stopped()) { 623 // This was some sort of virtual call, which did a null check for us. 624 // Now we can assert receiver-not-null, on the normal return path. 625 if (receiver != NULL && cg->is_virtual()) { 626 Node* cast = cast_not_null(receiver); 627 // %%% assert(receiver == cast, "should already have cast the receiver"); 628 } 629 630 // Round double result after a call from strict to non-strict code 631 round_double_result(cg->method()); 632 633 ciType* rtype = cg->method()->return_type(); 634 ciType* ctype = declared_signature->return_type(); 635 636 if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) { 637 // Be careful here with return types. 638 if (ctype != rtype) { 639 BasicType rt = rtype->basic_type(); 640 BasicType ct = ctype->basic_type(); 641 if (ct == T_VOID) { 642 // It's OK for a method to return a value that is discarded. 643 // The discarding does not require any special action from the caller. 644 // The Java code knows this, at VerifyType.isNullConversion. 645 pop_node(rt); // whatever it was, pop it 646 } else if (rt == T_INT || is_subword_type(rt)) { 647 // Nothing. These cases are handled in lambda form bytecode. 648 assert(ct == T_INT || is_subword_type(ct), "must match: rt=%s, ct=%s", type2name(rt), type2name(ct)); 649 } else if (rt == T_OBJECT || rt == T_ARRAY) { 650 assert(ct == T_OBJECT || ct == T_ARRAY, "rt=%s, ct=%s", type2name(rt), type2name(ct)); 651 if (ctype->is_loaded()) { 652 const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass()); 653 const Type* sig_type = TypeOopPtr::make_from_klass(ctype->as_klass()); 654 if (arg_type != NULL && !arg_type->higher_equal(sig_type)) { 655 Node* retnode = pop(); 656 Node* cast_obj = _gvn.transform(new CheckCastPPNode(control(), retnode, sig_type)); 657 push(cast_obj); 658 } 659 } 660 } else { 661 assert(rt == ct, "unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct)); 662 // push a zero; it's better than getting an oop/int mismatch 663 pop_node(rt); 664 Node* retnode = zerocon(ct); 665 push_node(ct, retnode); 666 } 667 // Now that the value is well-behaved, continue with the call-site type. 668 rtype = ctype; 669 } 670 } else { 671 // Symbolic resolution enforces the types to be the same. 672 // NOTE: We must relax the assert for unloaded types because two 673 // different ciType instances of the same unloaded class type 674 // can appear to be "loaded" by different loaders (depending on 675 // the accessing class). 676 assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype, 677 "mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name()); 678 } 679 680 // If the return type of the method is not loaded, assert that the 681 // value we got is a null. Otherwise, we need to recompile. 682 if (!rtype->is_loaded()) { 683 if (PrintOpto && (Verbose || WizardMode)) { 684 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci()); 685 cg->method()->print_name(); tty->cr(); 686 } 687 if (C->log() != NULL) { 688 C->log()->elem("assert_null reason='return' klass='%d'", 689 C->log()->identify(rtype)); 690 } 691 // If there is going to be a trap, put it at the next bytecode: 692 set_bci(iter().next_bci()); 693 null_assert(peek()); 694 set_bci(iter().cur_bci()); // put it back 695 } 696 BasicType ct = ctype->basic_type(); 697 if (ct == T_OBJECT || ct == T_ARRAY) { 698 record_profiled_return_for_speculation(); 699 } 700 } 701 702 // Restart record of parsing work after possible inlining of call 703 #ifndef PRODUCT 704 parse_histogram()->set_initial_state(bc()); 705 #endif 706 } 707 708 //---------------------------catch_call_exceptions----------------------------- 709 // Put a Catch and CatchProj nodes behind a just-created call. 710 // Send their caught exceptions to the proper handler. 711 // This may be used after a call to the rethrow VM stub, 712 // when it is needed to process unloaded exception classes. 713 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) { 714 // Exceptions are delivered through this channel: 715 Node* i_o = this->i_o(); 716 717 // Add a CatchNode. 718 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1); 719 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL); 720 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0); 721 722 for (; !handlers.is_done(); handlers.next()) { 723 ciExceptionHandler* h = handlers.handler(); 724 int h_bci = h->handler_bci(); 725 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass(); 726 // Do not introduce unloaded exception types into the graph: 727 if (!h_klass->is_loaded()) { 728 if (saw_unloaded->contains(h_bci)) { 729 /* We've already seen an unloaded exception with h_bci, 730 so don't duplicate. Duplication will cause the CatchNode to be 731 unnecessarily large. See 4713716. */ 732 continue; 733 } else { 734 saw_unloaded->append(h_bci); 735 } 736 } 737 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass); 738 // (We use make_from_klass because it respects UseUniqueSubclasses.) 739 h_extype = h_extype->join(TypeInstPtr::NOTNULL); 740 assert(!h_extype->empty(), "sanity"); 741 // Note: It's OK if the BCIs repeat themselves. 742 bcis->append(h_bci); 743 extypes->append(h_extype); 744 } 745 746 int len = bcis->length(); 747 CatchNode *cn = new CatchNode(control(), i_o, len+1); 748 Node *catch_ = _gvn.transform(cn); 749 750 // now branch with the exception state to each of the (potential) 751 // handlers 752 for(int i=0; i < len; i++) { 753 // Setup JVM state to enter the handler. 754 PreserveJVMState pjvms(this); 755 // Locals are just copied from before the call. 756 // Get control from the CatchNode. 757 int handler_bci = bcis->at(i); 758 Node* ctrl = _gvn.transform( new CatchProjNode(catch_, i+1,handler_bci)); 759 // This handler cannot happen? 760 if (ctrl == top()) continue; 761 set_control(ctrl); 762 763 // Create exception oop 764 const TypeInstPtr* extype = extypes->at(i)->is_instptr(); 765 Node *ex_oop = _gvn.transform(new CreateExNode(extypes->at(i), ctrl, i_o)); 766 767 // Handle unloaded exception classes. 768 if (saw_unloaded->contains(handler_bci)) { 769 // An unloaded exception type is coming here. Do an uncommon trap. 770 #ifndef PRODUCT 771 // We do not expect the same handler bci to take both cold unloaded 772 // and hot loaded exceptions. But, watch for it. 773 if ((Verbose || WizardMode) && extype->is_loaded()) { 774 tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci()); 775 method()->print_name(); tty->cr(); 776 } else if (PrintOpto && (Verbose || WizardMode)) { 777 tty->print("Bailing out on unloaded exception type "); 778 extype->klass()->print_name(); 779 tty->print(" at bci:%d in ", bci()); 780 method()->print_name(); tty->cr(); 781 } 782 #endif 783 // Emit an uncommon trap instead of processing the block. 784 set_bci(handler_bci); 785 push_ex_oop(ex_oop); 786 uncommon_trap(Deoptimization::Reason_unloaded, 787 Deoptimization::Action_reinterpret, 788 extype->klass(), "!loaded exception"); 789 set_bci(iter().cur_bci()); // put it back 790 continue; 791 } 792 793 // go to the exception handler 794 if (handler_bci < 0) { // merge with corresponding rethrow node 795 throw_to_exit(make_exception_state(ex_oop)); 796 } else { // Else jump to corresponding handle 797 push_ex_oop(ex_oop); // Clear stack and push just the oop. 798 merge_exception(handler_bci); 799 } 800 } 801 802 // The first CatchProj is for the normal return. 803 // (Note: If this is a call to rethrow_Java, this node goes dead.) 804 set_control(_gvn.transform( new CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci))); 805 } 806 807 808 //----------------------------catch_inline_exceptions-------------------------- 809 // Handle all exceptions thrown by an inlined method or individual bytecode. 810 // Common case 1: we have no handler, so all exceptions merge right into 811 // the rethrow case. 812 // Case 2: we have some handlers, with loaded exception klasses that have 813 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming 814 // exception oop and branch to the handler directly. 815 // Case 3: We have some handlers with subklasses or are not loaded at 816 // compile-time. We have to call the runtime to resolve the exception. 817 // So we insert a RethrowCall and all the logic that goes with it. 818 void Parse::catch_inline_exceptions(SafePointNode* ex_map) { 819 // Caller is responsible for saving away the map for normal control flow! 820 assert(stopped(), "call set_map(NULL) first"); 821 assert(method()->has_exception_handlers(), "don't come here w/o work to do"); 822 823 Node* ex_node = saved_ex_oop(ex_map); 824 if (ex_node == top()) { 825 // No action needed. 826 return; 827 } 828 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr(); 829 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr")); 830 if (ex_type == NULL) 831 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr(); 832 833 // determine potential exception handlers 834 ciExceptionHandlerStream handlers(method(), bci(), 835 ex_type->klass()->as_instance_klass(), 836 ex_type->klass_is_exact()); 837 838 // Start executing from the given throw state. (Keep its stack, for now.) 839 // Get the exception oop as known at compile time. 840 ex_node = use_exception_state(ex_map); 841 842 // Get the exception oop klass from its header 843 Node* ex_klass_node = NULL; 844 if (has_ex_handler() && !ex_type->klass_is_exact()) { 845 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes()); 846 ex_klass_node = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT)); 847 848 // Compute the exception klass a little more cleverly. 849 // Obvious solution is to simple do a LoadKlass from the 'ex_node'. 850 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for 851 // each arm of the Phi. If I know something clever about the exceptions 852 // I'm loading the class from, I can replace the LoadKlass with the 853 // klass constant for the exception oop. 854 if (ex_node->is_Phi()) { 855 ex_klass_node = new PhiNode(ex_node->in(0), TypeKlassPtr::OBJECT); 856 for (uint i = 1; i < ex_node->req(); i++) { 857 Node* ex_in = ex_node->in(i); 858 if (ex_in == top() || ex_in == NULL) { 859 // This path was not taken. 860 ex_klass_node->init_req(i, top()); 861 continue; 862 } 863 Node* p = basic_plus_adr(ex_in, ex_in, oopDesc::klass_offset_in_bytes()); 864 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT)); 865 ex_klass_node->init_req( i, k ); 866 } 867 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT); 868 869 } 870 } 871 872 // Scan the exception table for applicable handlers. 873 // If none, we can call rethrow() and be done! 874 // If precise (loaded with no subklasses), insert a D.S. style 875 // pointer compare to the correct handler and loop back. 876 // If imprecise, switch to the Rethrow VM-call style handling. 877 878 int remaining = handlers.count_remaining(); 879 880 // iterate through all entries sequentially 881 for (;!handlers.is_done(); handlers.next()) { 882 ciExceptionHandler* handler = handlers.handler(); 883 884 if (handler->is_rethrow()) { 885 // If we fell off the end of the table without finding an imprecise 886 // exception klass (and without finding a generic handler) then we 887 // know this exception is not handled in this method. We just rethrow 888 // the exception into the caller. 889 throw_to_exit(make_exception_state(ex_node)); 890 return; 891 } 892 893 // exception handler bci range covers throw_bci => investigate further 894 int handler_bci = handler->handler_bci(); 895 896 if (remaining == 1) { 897 push_ex_oop(ex_node); // Push exception oop for handler 898 if (PrintOpto && WizardMode) { 899 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci); 900 } 901 merge_exception(handler_bci); // jump to handler 902 return; // No more handling to be done here! 903 } 904 905 // Get the handler's klass 906 ciInstanceKlass* klass = handler->catch_klass(); 907 908 if (!klass->is_loaded()) { // klass is not loaded? 909 // fall through into catch_call_exceptions which will emit a 910 // handler with an uncommon trap. 911 break; 912 } 913 914 if (klass->is_interface()) // should not happen, but... 915 break; // bail out 916 917 // Check the type of the exception against the catch type 918 const TypeKlassPtr *tk = TypeKlassPtr::make(klass); 919 Node* con = _gvn.makecon(tk); 920 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con); 921 if (!stopped()) { 922 PreserveJVMState pjvms(this); 923 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr(); 924 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness"); 925 Node* ex_oop = _gvn.transform(new CheckCastPPNode(control(), ex_node, tinst)); 926 push_ex_oop(ex_oop); // Push exception oop for handler 927 if (PrintOpto && WizardMode) { 928 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci); 929 klass->print_name(); 930 tty->cr(); 931 } 932 merge_exception(handler_bci); 933 } 934 set_control(not_subtype_ctrl); 935 936 // Come here if exception does not match handler. 937 // Carry on with more handler checks. 938 --remaining; 939 } 940 941 assert(!stopped(), "you should return if you finish the chain"); 942 943 // Oops, need to call into the VM to resolve the klasses at runtime. 944 // Note: This call must not deoptimize, since it is not a real at this bci! 945 kill_dead_locals(); 946 947 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW, 948 OptoRuntime::rethrow_Type(), 949 OptoRuntime::rethrow_stub(), 950 NULL, NULL, 951 ex_node); 952 953 // Rethrow is a pure call, no side effects, only a result. 954 // The result cannot be allocated, so we use I_O 955 956 // Catch exceptions from the rethrow 957 catch_call_exceptions(handlers); 958 } 959 960 961 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.) 962 963 964 #ifndef PRODUCT 965 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) { 966 if( CountCompiledCalls ) { 967 if( at_method_entry ) { 968 // bump invocation counter if top method (for statistics) 969 if (CountCompiledCalls && depth() == 1) { 970 const TypePtr* addr_type = TypeMetadataPtr::make(method()); 971 Node* adr1 = makecon(addr_type); 972 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset())); 973 increment_counter(adr2); 974 } 975 } else if (is_inline) { 976 switch (bc()) { 977 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break; 978 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break; 979 case Bytecodes::_invokestatic: 980 case Bytecodes::_invokedynamic: 981 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break; 982 default: fatal("unexpected call bytecode"); 983 } 984 } else { 985 switch (bc()) { 986 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break; 987 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break; 988 case Bytecodes::_invokestatic: 989 case Bytecodes::_invokedynamic: 990 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break; 991 default: fatal("unexpected call bytecode"); 992 } 993 } 994 } 995 } 996 #endif //PRODUCT 997 998 999 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, int bci, ciInstanceKlass* klass, 1000 ciKlass* holder, ciMethod* callee, 1001 const TypeOopPtr* receiver_type, bool is_virtual, 1002 bool& call_does_dispatch, int& vtable_index, 1003 bool check_access) { 1004 // Set default values for out-parameters. 1005 call_does_dispatch = true; 1006 vtable_index = Method::invalid_vtable_index; 1007 1008 // Choose call strategy. 1009 ciMethod* optimized_virtual_method = optimize_inlining(caller, bci, klass, callee, 1010 receiver_type, check_access); 1011 1012 // Have the call been sufficiently improved such that it is no longer a virtual? 1013 if (optimized_virtual_method != NULL) { 1014 callee = optimized_virtual_method; 1015 call_does_dispatch = false; 1016 } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) { 1017 // We can make a vtable call at this site 1018 vtable_index = callee->resolve_vtable_index(caller->holder(), holder); 1019 } 1020 return callee; 1021 } 1022 1023 // Identify possible target method and inlining style 1024 ciMethod* Compile::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass, 1025 ciMethod* callee, const TypeOopPtr* receiver_type, 1026 bool check_access) { 1027 // only use for virtual or interface calls 1028 1029 // If it is obviously final, do not bother to call find_monomorphic_target, 1030 // because the class hierarchy checks are not needed, and may fail due to 1031 // incompletely loaded classes. Since we do our own class loading checks 1032 // in this module, we may confidently bind to any method. 1033 if (callee->can_be_statically_bound()) { 1034 return callee; 1035 } 1036 1037 // Attempt to improve the receiver 1038 bool actual_receiver_is_exact = false; 1039 ciInstanceKlass* actual_receiver = klass; 1040 if (receiver_type != NULL) { 1041 // Array methods are all inherited from Object, and are monomorphic. 1042 // finalize() call on array is not allowed. 1043 if (receiver_type->isa_aryptr() && 1044 callee->holder() == env()->Object_klass() && 1045 callee->name() != ciSymbol::finalize_method_name()) { 1046 return callee; 1047 } 1048 1049 // All other interesting cases are instance klasses. 1050 if (!receiver_type->isa_instptr()) { 1051 return NULL; 1052 } 1053 1054 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass(); 1055 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() && 1056 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) { 1057 // ikl is a same or better type than the original actual_receiver, 1058 // e.g. static receiver from bytecodes. 1059 actual_receiver = ikl; 1060 // Is the actual_receiver exact? 1061 actual_receiver_is_exact = receiver_type->klass_is_exact(); 1062 } 1063 } 1064 1065 ciInstanceKlass* calling_klass = caller->holder(); 1066 ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver, check_access); 1067 if (cha_monomorphic_target != NULL) { 1068 assert(!cha_monomorphic_target->is_abstract(), ""); 1069 // Look at the method-receiver type. Does it add "too much information"? 1070 ciKlass* mr_klass = cha_monomorphic_target->holder(); 1071 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass); 1072 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) { 1073 // Calling this method would include an implicit cast to its holder. 1074 // %%% Not yet implemented. Would throw minor asserts at present. 1075 // %%% The most common wins are already gained by +UseUniqueSubclasses. 1076 // To fix, put the higher_equal check at the call of this routine, 1077 // and add a CheckCastPP to the receiver. 1078 if (TraceDependencies) { 1079 tty->print_cr("found unique CHA method, but could not cast up"); 1080 tty->print(" method = "); 1081 cha_monomorphic_target->print(); 1082 tty->cr(); 1083 } 1084 if (log() != NULL) { 1085 log()->elem("missed_CHA_opportunity klass='%d' method='%d'", 1086 log()->identify(klass), 1087 log()->identify(cha_monomorphic_target)); 1088 } 1089 cha_monomorphic_target = NULL; 1090 } 1091 } 1092 if (cha_monomorphic_target != NULL) { 1093 // Hardwiring a virtual. 1094 // If we inlined because CHA revealed only a single target method, 1095 // then we are dependent on that target method not getting overridden 1096 // by dynamic class loading. Be sure to test the "static" receiver 1097 // dest_method here, as opposed to the actual receiver, which may 1098 // falsely lead us to believe that the receiver is final or private. 1099 dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target); 1100 return cha_monomorphic_target; 1101 } 1102 1103 // If the type is exact, we can still bind the method w/o a vcall. 1104 // (This case comes after CHA so we can see how much extra work it does.) 1105 if (actual_receiver_is_exact) { 1106 // In case of evolution, there is a dependence on every inlined method, since each 1107 // such method can be changed when its class is redefined. 1108 ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver); 1109 if (exact_method != NULL) { 1110 if (PrintOpto) { 1111 tty->print(" Calling method via exact type @%d --- ", bci); 1112 exact_method->print_name(); 1113 tty->cr(); 1114 } 1115 return exact_method; 1116 } 1117 } 1118 1119 return NULL; 1120 }