1 /* 2 * Copyright (c) 1998, 2014, 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 (NOT_PRODUCT(!PrintOpto &&) !PrintCompilation) { 49 method->print_short_name(); 50 tty->cr(); 51 } 52 CompileTask::print_inlining(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='%g'", 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 // We have a speculative type, we should be able to resolve 213 // the call. We do that before looking at the profiling at 214 // this invoke because it may lead to bimorphic inlining which 215 // a speculative type should help us avoid. 216 receiver_method = callee->resolve_invoke(jvms->method()->holder(), 217 speculative_receiver_type); 218 if (receiver_method == NULL) { 219 speculative_receiver_type = NULL; 220 } else { 221 morphism = 1; 222 } 223 } 224 if (receiver_method == NULL && 225 (have_major_receiver || morphism == 1 || 226 (morphism == 2 && UseBimorphicInlining))) { 227 // receiver_method = profile.method(); 228 // Profiles do not suggest methods now. Look it up in the major receiver. 229 receiver_method = callee->resolve_invoke(jvms->method()->holder(), 230 profile.receiver(0)); 231 } 232 if (receiver_method != NULL) { 233 // The single majority receiver sufficiently outweighs the minority. 234 CallGenerator* hit_cg = this->call_generator(receiver_method, 235 vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor); 236 if (hit_cg != NULL) { 237 // Look up second receiver. 238 CallGenerator* next_hit_cg = NULL; 239 ciMethod* next_receiver_method = NULL; 240 if (morphism == 2 && UseBimorphicInlining) { 241 next_receiver_method = callee->resolve_invoke(jvms->method()->holder(), 242 profile.receiver(1)); 243 if (next_receiver_method != NULL) { 244 next_hit_cg = this->call_generator(next_receiver_method, 245 vtable_index, !call_does_dispatch, jvms, 246 allow_inline, prof_factor); 247 if (next_hit_cg != NULL && !next_hit_cg->is_inline() && 248 have_major_receiver && UseOnlyInlinedBimorphic) { 249 // Skip if we can't inline second receiver's method 250 next_hit_cg = NULL; 251 } 252 } 253 } 254 CallGenerator* miss_cg; 255 Deoptimization::DeoptReason reason = morphism == 2 ? 256 Deoptimization::Reason_bimorphic : Deoptimization::reason_class_check(speculative_receiver_type != NULL); 257 if ((morphism == 1 || (morphism == 2 && next_hit_cg != NULL)) && 258 !too_many_traps(jvms->method(), jvms->bci(), reason) 259 ) { 260 // Generate uncommon trap for class check failure path 261 // in case of monomorphic or bimorphic virtual call site. 262 miss_cg = CallGenerator::for_uncommon_trap(callee, reason, 263 Deoptimization::Action_maybe_recompile); 264 } else { 265 // Generate virtual call for class check failure path 266 // in case of polymorphic virtual call site. 267 miss_cg = CallGenerator::for_virtual_call(callee, vtable_index); 268 } 269 if (miss_cg != NULL) { 270 if (next_hit_cg != NULL) { 271 assert(speculative_receiver_type == NULL, "shouldn't end up here if we used speculation"); 272 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1)); 273 // We don't need to record dependency on a receiver here and below. 274 // Whenever we inline, the dependency is added by Parse::Parse(). 275 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX); 276 } 277 if (miss_cg != NULL) { 278 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count); 279 ciKlass* k = speculative_receiver_type != NULL ? speculative_receiver_type : profile.receiver(0); 280 float hit_prob = speculative_receiver_type != NULL ? 1.0 : profile.receiver_prob(0); 281 CallGenerator* cg = CallGenerator::for_predicted_call(k, miss_cg, hit_cg, hit_prob); 282 if (cg != NULL) return cg; 283 } 284 } 285 } 286 } 287 } 288 } 289 290 // Nothing claimed the intrinsic, we go with straight-forward inlining 291 // for already discovered intrinsic. 292 if (allow_inline && allow_intrinsics && cg_intrinsic != NULL) { 293 assert(cg_intrinsic->does_virtual_dispatch(), "sanity"); 294 return cg_intrinsic; 295 } 296 297 // There was no special inlining tactic, or it bailed out. 298 // Use a more generic tactic, like a simple call. 299 if (call_does_dispatch) { 300 const char* msg = "virtual call"; 301 if (PrintInlining) print_inlining(callee, jvms->depth() - 1, jvms->bci(), msg); 302 C->log_inline_failure(msg); 303 return CallGenerator::for_virtual_call(callee, vtable_index); 304 } else { 305 // Class Hierarchy Analysis or Type Profile reveals a unique target, 306 // or it is a static or special call. 307 return CallGenerator::for_direct_call(callee, should_delay_inlining(callee, jvms)); 308 } 309 } 310 311 // Return true for methods that shouldn't be inlined early so that 312 // they are easier to analyze and optimize as intrinsics. 313 bool Compile::should_delay_string_inlining(ciMethod* call_method, JVMState* jvms) { 314 if (has_stringbuilder()) { 315 316 if ((call_method->holder() == C->env()->StringBuilder_klass() || 317 call_method->holder() == C->env()->StringBuffer_klass()) && 318 (jvms->method()->holder() == C->env()->StringBuilder_klass() || 319 jvms->method()->holder() == C->env()->StringBuffer_klass())) { 320 // Delay SB calls only when called from non-SB code 321 return false; 322 } 323 324 switch (call_method->intrinsic_id()) { 325 case vmIntrinsics::_StringBuilder_void: 326 case vmIntrinsics::_StringBuilder_int: 327 case vmIntrinsics::_StringBuilder_String: 328 case vmIntrinsics::_StringBuilder_append_char: 329 case vmIntrinsics::_StringBuilder_append_int: 330 case vmIntrinsics::_StringBuilder_append_String: 331 case vmIntrinsics::_StringBuilder_toString: 332 case vmIntrinsics::_StringBuffer_void: 333 case vmIntrinsics::_StringBuffer_int: 334 case vmIntrinsics::_StringBuffer_String: 335 case vmIntrinsics::_StringBuffer_append_char: 336 case vmIntrinsics::_StringBuffer_append_int: 337 case vmIntrinsics::_StringBuffer_append_String: 338 case vmIntrinsics::_StringBuffer_toString: 339 case vmIntrinsics::_Integer_toString: 340 return true; 341 342 case vmIntrinsics::_String_String: 343 { 344 Node* receiver = jvms->map()->in(jvms->argoff() + 1); 345 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) { 346 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava(); 347 ciMethod* m = csj->method(); 348 if (m != NULL && 349 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString || 350 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString)) 351 // Delay String.<init>(new SB()) 352 return true; 353 } 354 return false; 355 } 356 357 default: 358 return false; 359 } 360 } 361 return false; 362 } 363 364 bool Compile::should_delay_boxing_inlining(ciMethod* call_method, JVMState* jvms) { 365 if (eliminate_boxing() && call_method->is_boxing_method()) { 366 set_has_boxed_value(true); 367 return aggressive_unboxing(); 368 } 369 return false; 370 } 371 372 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link 373 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) { 374 // Additional inputs to consider... 375 // bc = bc() 376 // caller = method() 377 // iter().get_method_holder_index() 378 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" ); 379 // Interface classes can be loaded & linked and never get around to 380 // being initialized. Uncommon-trap for not-initialized static or 381 // v-calls. Let interface calls happen. 382 ciInstanceKlass* holder_klass = dest_method->holder(); 383 if (!holder_klass->is_being_initialized() && 384 !holder_klass->is_initialized() && 385 !holder_klass->is_interface()) { 386 uncommon_trap(Deoptimization::Reason_uninitialized, 387 Deoptimization::Action_reinterpret, 388 holder_klass); 389 return true; 390 } 391 392 assert(dest_method->is_loaded(), "dest_method: typeflow responsibility"); 393 return false; 394 } 395 396 397 //------------------------------do_call---------------------------------------- 398 // Handle your basic call. Inline if we can & want to, else just setup call. 399 void Parse::do_call() { 400 // It's likely we are going to add debug info soon. 401 // Also, if we inline a guy who eventually needs debug info for this JVMS, 402 // our contribution to it is cleaned up right here. 403 kill_dead_locals(); 404 405 C->print_inlining_assert_ready(); 406 407 // Set frequently used booleans 408 const bool is_virtual = bc() == Bytecodes::_invokevirtual; 409 const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface; 410 const bool has_receiver = Bytecodes::has_receiver(bc()); 411 412 // Find target being called 413 bool will_link; 414 ciSignature* declared_signature = NULL; 415 ciMethod* orig_callee = iter().get_method(will_link, &declared_signature); // callee in the bytecode 416 ciInstanceKlass* holder_klass = orig_callee->holder(); 417 ciKlass* holder = iter().get_declared_method_holder(); 418 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder); 419 assert(declared_signature != NULL, "cannot be null"); 420 421 // uncommon-trap when callee is unloaded, uninitialized or will not link 422 // bailout when too many arguments for register representation 423 if (!will_link || can_not_compile_call_site(orig_callee, klass)) { 424 #ifndef PRODUCT 425 if (PrintOpto && (Verbose || WizardMode)) { 426 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci()); 427 orig_callee->print_name(); tty->cr(); 428 } 429 #endif 430 return; 431 } 432 assert(holder_klass->is_loaded(), ""); 433 //assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); // XXX invokehandle (cur_bc_raw) 434 // Note: this takes into account invokeinterface of methods declared in java/lang/Object, 435 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces 436 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc"); 437 // Note: In the absence of miranda methods, an abstract class K can perform 438 // an invokevirtual directly on an interface method I.m if K implements I. 439 440 // orig_callee is the resolved callee which's signature includes the 441 // appendix argument. 442 const int nargs = orig_callee->arg_size(); 443 const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id()); 444 445 // Push appendix argument (MethodType, CallSite, etc.), if one. 446 if (iter().has_appendix()) { 447 ciObject* appendix_arg = iter().get_appendix(); 448 const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg); 449 Node* appendix_arg_node = _gvn.makecon(appendix_arg_type); 450 push(appendix_arg_node); 451 } 452 453 // --------------------- 454 // Does Class Hierarchy Analysis reveal only a single target of a v-call? 455 // Then we may inline or make a static call, but become dependent on there being only 1 target. 456 // Does the call-site type profile reveal only one receiver? 457 // Then we may introduce a run-time check and inline on the path where it succeeds. 458 // The other path may uncommon_trap, check for another receiver, or do a v-call. 459 460 // Try to get the most accurate receiver type 461 ciMethod* callee = orig_callee; 462 int vtable_index = Method::invalid_vtable_index; 463 bool call_does_dispatch = false; 464 465 // Speculative type of the receiver if any 466 ciKlass* speculative_receiver_type = NULL; 467 if (is_virtual_or_interface) { 468 Node* receiver_node = stack(sp() - nargs); 469 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr(); 470 // call_does_dispatch and vtable_index are out-parameters. They might be changed. 471 // For arrays, klass below is Object. When vtable calls are used, 472 // resolving the call with Object would allow an illegal call to 473 // finalize() on an array. We use holder instead: illegal calls to 474 // finalize() won't be compiled as vtable calls (IC call 475 // resolution will catch the illegal call) and the few legal calls 476 // on array types won't be either. 477 callee = C->optimize_virtual_call(method(), bci(), klass, holder, orig_callee, 478 receiver_type, is_virtual, 479 call_does_dispatch, vtable_index); // out-parameters 480 speculative_receiver_type = receiver_type != NULL ? receiver_type->speculative_type() : NULL; 481 } 482 483 // Note: It's OK to try to inline a virtual call. 484 // The call generator will not attempt to inline a polymorphic call 485 // unless it knows how to optimize the receiver dispatch. 486 bool try_inline = (C->do_inlining() || InlineAccessors); 487 488 // --------------------- 489 dec_sp(nargs); // Temporarily pop args for JVM state of call 490 JVMState* jvms = sync_jvms(); 491 492 // --------------------- 493 // Decide call tactic. 494 // This call checks with CHA, the interpreter profile, intrinsics table, etc. 495 // It decides whether inlining is desirable or not. 496 CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type); 497 498 // NOTE: Don't use orig_callee and callee after this point! Use cg->method() instead. 499 orig_callee = callee = NULL; 500 501 // --------------------- 502 // Round double arguments before call 503 round_double_arguments(cg->method()); 504 505 // Feed profiling data for arguments to the type system so it can 506 // propagate it as speculative types 507 record_profiled_arguments_for_speculation(cg->method(), bc()); 508 509 #ifndef PRODUCT 510 // bump global counters for calls 511 count_compiled_calls(/*at_method_entry*/ false, cg->is_inline()); 512 513 // Record first part of parsing work for this call 514 parse_histogram()->record_change(); 515 #endif // not PRODUCT 516 517 assert(jvms == this->jvms(), "still operating on the right JVMS"); 518 assert(jvms_in_sync(), "jvms must carry full info into CG"); 519 520 // save across call, for a subsequent cast_not_null. 521 Node* receiver = has_receiver ? argument(0) : NULL; 522 523 // The extra CheckCastPP for speculative types mess with PhaseStringOpts 524 if (receiver != NULL && !call_does_dispatch && !cg->is_string_late_inline()) { 525 // Feed profiling data for a single receiver to the type system so 526 // it can propagate it as a speculative type 527 receiver = record_profiled_receiver_for_speculation(receiver); 528 } 529 530 // Bump method data counters (We profile *before* the call is made 531 // because exceptions don't return to the call site.) 532 profile_call(receiver); 533 534 JVMState* new_jvms = cg->generate(jvms); 535 if (new_jvms == NULL) { 536 // When inlining attempt fails (e.g., too many arguments), 537 // it may contaminate the current compile state, making it 538 // impossible to pull back and try again. Once we call 539 // cg->generate(), we are committed. If it fails, the whole 540 // compilation task is compromised. 541 if (failing()) return; 542 543 // This can happen if a library intrinsic is available, but refuses 544 // the call site, perhaps because it did not match a pattern the 545 // intrinsic was expecting to optimize. Should always be possible to 546 // get a normal java call that may inline in that case 547 cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type, /* allow_intrinsics= */ false); 548 new_jvms = cg->generate(jvms); 549 if (new_jvms == NULL) { 550 guarantee(failing(), "call failed to generate: calls should work"); 551 return; 552 } 553 } 554 555 if (cg->is_inline()) { 556 // Accumulate has_loops estimate 557 C->set_has_loops(C->has_loops() || cg->method()->has_loops()); 558 C->env()->notice_inlined_method(cg->method()); 559 } 560 561 // Reset parser state from [new_]jvms, which now carries results of the call. 562 // Return value (if any) is already pushed on the stack by the cg. 563 add_exception_states_from(new_jvms); 564 if (new_jvms->map()->control() == top()) { 565 stop_and_kill_map(); 566 } else { 567 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged"); 568 set_jvms(new_jvms); 569 } 570 571 if (!stopped()) { 572 // This was some sort of virtual call, which did a null check for us. 573 // Now we can assert receiver-not-null, on the normal return path. 574 if (receiver != NULL && cg->is_virtual()) { 575 Node* cast = cast_not_null(receiver); 576 // %%% assert(receiver == cast, "should already have cast the receiver"); 577 } 578 579 // Round double result after a call from strict to non-strict code 580 round_double_result(cg->method()); 581 582 ciType* rtype = cg->method()->return_type(); 583 ciType* ctype = declared_signature->return_type(); 584 585 if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) { 586 // Be careful here with return types. 587 if (ctype != rtype) { 588 BasicType rt = rtype->basic_type(); 589 BasicType ct = ctype->basic_type(); 590 if (ct == T_VOID) { 591 // It's OK for a method to return a value that is discarded. 592 // The discarding does not require any special action from the caller. 593 // The Java code knows this, at VerifyType.isNullConversion. 594 pop_node(rt); // whatever it was, pop it 595 } else if (rt == T_INT || is_subword_type(rt)) { 596 // Nothing. These cases are handled in lambda form bytecode. 597 assert(ct == T_INT || is_subword_type(ct), err_msg_res("must match: rt=%s, ct=%s", type2name(rt), type2name(ct))); 598 } else if (rt == T_OBJECT || rt == T_ARRAY) { 599 assert(ct == T_OBJECT || ct == T_ARRAY, err_msg_res("rt=%s, ct=%s", type2name(rt), type2name(ct))); 600 if (ctype->is_loaded()) { 601 const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass()); 602 const Type* sig_type = TypeOopPtr::make_from_klass(ctype->as_klass()); 603 if (arg_type != NULL && !arg_type->higher_equal(sig_type)) { 604 Node* retnode = pop(); 605 Node* cast_obj = _gvn.transform(new CheckCastPPNode(control(), retnode, sig_type)); 606 push(cast_obj); 607 } 608 } 609 } else { 610 assert(rt == ct, err_msg_res("unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct))); 611 // push a zero; it's better than getting an oop/int mismatch 612 pop_node(rt); 613 Node* retnode = zerocon(ct); 614 push_node(ct, retnode); 615 } 616 // Now that the value is well-behaved, continue with the call-site type. 617 rtype = ctype; 618 } 619 } else { 620 // Symbolic resolution enforces the types to be the same. 621 // NOTE: We must relax the assert for unloaded types because two 622 // different ciType instances of the same unloaded class type 623 // can appear to be "loaded" by different loaders (depending on 624 // the accessing class). 625 assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype, 626 err_msg_res("mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name())); 627 } 628 629 // If the return type of the method is not loaded, assert that the 630 // value we got is a null. Otherwise, we need to recompile. 631 if (!rtype->is_loaded()) { 632 #ifndef PRODUCT 633 if (PrintOpto && (Verbose || WizardMode)) { 634 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci()); 635 cg->method()->print_name(); tty->cr(); 636 } 637 #endif 638 if (C->log() != NULL) { 639 C->log()->elem("assert_null reason='return' klass='%d'", 640 C->log()->identify(rtype)); 641 } 642 // If there is going to be a trap, put it at the next bytecode: 643 set_bci(iter().next_bci()); 644 null_assert(peek()); 645 set_bci(iter().cur_bci()); // put it back 646 } 647 BasicType ct = ctype->basic_type(); 648 if (ct == T_OBJECT || ct == T_ARRAY) { 649 record_profiled_return_for_speculation(); 650 } 651 } 652 653 // Restart record of parsing work after possible inlining of call 654 #ifndef PRODUCT 655 parse_histogram()->set_initial_state(bc()); 656 #endif 657 } 658 659 //---------------------------catch_call_exceptions----------------------------- 660 // Put a Catch and CatchProj nodes behind a just-created call. 661 // Send their caught exceptions to the proper handler. 662 // This may be used after a call to the rethrow VM stub, 663 // when it is needed to process unloaded exception classes. 664 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) { 665 // Exceptions are delivered through this channel: 666 Node* i_o = this->i_o(); 667 668 // Add a CatchNode. 669 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1); 670 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL); 671 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0); 672 673 for (; !handlers.is_done(); handlers.next()) { 674 ciExceptionHandler* h = handlers.handler(); 675 int h_bci = h->handler_bci(); 676 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass(); 677 // Do not introduce unloaded exception types into the graph: 678 if (!h_klass->is_loaded()) { 679 if (saw_unloaded->contains(h_bci)) { 680 /* We've already seen an unloaded exception with h_bci, 681 so don't duplicate. Duplication will cause the CatchNode to be 682 unnecessarily large. See 4713716. */ 683 continue; 684 } else { 685 saw_unloaded->append(h_bci); 686 } 687 } 688 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass); 689 // (We use make_from_klass because it respects UseUniqueSubclasses.) 690 h_extype = h_extype->join(TypeInstPtr::NOTNULL); 691 assert(!h_extype->empty(), "sanity"); 692 // Note: It's OK if the BCIs repeat themselves. 693 bcis->append(h_bci); 694 extypes->append(h_extype); 695 } 696 697 int len = bcis->length(); 698 CatchNode *cn = new CatchNode(control(), i_o, len+1); 699 Node *catch_ = _gvn.transform(cn); 700 701 // now branch with the exception state to each of the (potential) 702 // handlers 703 for(int i=0; i < len; i++) { 704 // Setup JVM state to enter the handler. 705 PreserveJVMState pjvms(this); 706 // Locals are just copied from before the call. 707 // Get control from the CatchNode. 708 int handler_bci = bcis->at(i); 709 Node* ctrl = _gvn.transform( new CatchProjNode(catch_, i+1,handler_bci)); 710 // This handler cannot happen? 711 if (ctrl == top()) continue; 712 set_control(ctrl); 713 714 // Create exception oop 715 const TypeInstPtr* extype = extypes->at(i)->is_instptr(); 716 Node *ex_oop = _gvn.transform(new CreateExNode(extypes->at(i), ctrl, i_o)); 717 718 // Handle unloaded exception classes. 719 if (saw_unloaded->contains(handler_bci)) { 720 // An unloaded exception type is coming here. Do an uncommon trap. 721 #ifndef PRODUCT 722 // We do not expect the same handler bci to take both cold unloaded 723 // and hot loaded exceptions. But, watch for it. 724 if ((Verbose || WizardMode) && extype->is_loaded()) { 725 tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci()); 726 method()->print_name(); tty->cr(); 727 } else if (PrintOpto && (Verbose || WizardMode)) { 728 tty->print("Bailing out on unloaded exception type "); 729 extype->klass()->print_name(); 730 tty->print(" at bci:%d in ", bci()); 731 method()->print_name(); tty->cr(); 732 } 733 #endif 734 // Emit an uncommon trap instead of processing the block. 735 set_bci(handler_bci); 736 push_ex_oop(ex_oop); 737 uncommon_trap(Deoptimization::Reason_unloaded, 738 Deoptimization::Action_reinterpret, 739 extype->klass(), "!loaded exception"); 740 set_bci(iter().cur_bci()); // put it back 741 continue; 742 } 743 744 // go to the exception handler 745 if (handler_bci < 0) { // merge with corresponding rethrow node 746 throw_to_exit(make_exception_state(ex_oop)); 747 } else { // Else jump to corresponding handle 748 push_ex_oop(ex_oop); // Clear stack and push just the oop. 749 merge_exception(handler_bci); 750 } 751 } 752 753 // The first CatchProj is for the normal return. 754 // (Note: If this is a call to rethrow_Java, this node goes dead.) 755 set_control(_gvn.transform( new CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci))); 756 } 757 758 759 //----------------------------catch_inline_exceptions-------------------------- 760 // Handle all exceptions thrown by an inlined method or individual bytecode. 761 // Common case 1: we have no handler, so all exceptions merge right into 762 // the rethrow case. 763 // Case 2: we have some handlers, with loaded exception klasses that have 764 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming 765 // exception oop and branch to the handler directly. 766 // Case 3: We have some handlers with subklasses or are not loaded at 767 // compile-time. We have to call the runtime to resolve the exception. 768 // So we insert a RethrowCall and all the logic that goes with it. 769 void Parse::catch_inline_exceptions(SafePointNode* ex_map) { 770 // Caller is responsible for saving away the map for normal control flow! 771 assert(stopped(), "call set_map(NULL) first"); 772 assert(method()->has_exception_handlers(), "don't come here w/o work to do"); 773 774 Node* ex_node = saved_ex_oop(ex_map); 775 if (ex_node == top()) { 776 // No action needed. 777 return; 778 } 779 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr(); 780 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr")); 781 if (ex_type == NULL) 782 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr(); 783 784 // determine potential exception handlers 785 ciExceptionHandlerStream handlers(method(), bci(), 786 ex_type->klass()->as_instance_klass(), 787 ex_type->klass_is_exact()); 788 789 // Start executing from the given throw state. (Keep its stack, for now.) 790 // Get the exception oop as known at compile time. 791 ex_node = use_exception_state(ex_map); 792 793 // Get the exception oop klass from its header 794 Node* ex_klass_node = NULL; 795 if (has_ex_handler() && !ex_type->klass_is_exact()) { 796 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes()); 797 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); 798 799 // Compute the exception klass a little more cleverly. 800 // Obvious solution is to simple do a LoadKlass from the 'ex_node'. 801 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for 802 // each arm of the Phi. If I know something clever about the exceptions 803 // I'm loading the class from, I can replace the LoadKlass with the 804 // klass constant for the exception oop. 805 if( ex_node->is_Phi() ) { 806 ex_klass_node = new PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT ); 807 for( uint i = 1; i < ex_node->req(); i++ ) { 808 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() ); 809 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); 810 ex_klass_node->init_req( i, k ); 811 } 812 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT); 813 814 } 815 } 816 817 // Scan the exception table for applicable handlers. 818 // If none, we can call rethrow() and be done! 819 // If precise (loaded with no subklasses), insert a D.S. style 820 // pointer compare to the correct handler and loop back. 821 // If imprecise, switch to the Rethrow VM-call style handling. 822 823 int remaining = handlers.count_remaining(); 824 825 // iterate through all entries sequentially 826 for (;!handlers.is_done(); handlers.next()) { 827 ciExceptionHandler* handler = handlers.handler(); 828 829 if (handler->is_rethrow()) { 830 // If we fell off the end of the table without finding an imprecise 831 // exception klass (and without finding a generic handler) then we 832 // know this exception is not handled in this method. We just rethrow 833 // the exception into the caller. 834 throw_to_exit(make_exception_state(ex_node)); 835 return; 836 } 837 838 // exception handler bci range covers throw_bci => investigate further 839 int handler_bci = handler->handler_bci(); 840 841 if (remaining == 1) { 842 push_ex_oop(ex_node); // Push exception oop for handler 843 #ifndef PRODUCT 844 if (PrintOpto && WizardMode) { 845 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci); 846 } 847 #endif 848 merge_exception(handler_bci); // jump to handler 849 return; // No more handling to be done here! 850 } 851 852 // Get the handler's klass 853 ciInstanceKlass* klass = handler->catch_klass(); 854 855 if (!klass->is_loaded()) { // klass is not loaded? 856 // fall through into catch_call_exceptions which will emit a 857 // handler with an uncommon trap. 858 break; 859 } 860 861 if (klass->is_interface()) // should not happen, but... 862 break; // bail out 863 864 // Check the type of the exception against the catch type 865 const TypeKlassPtr *tk = TypeKlassPtr::make(klass); 866 Node* con = _gvn.makecon(tk); 867 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con); 868 if (!stopped()) { 869 PreserveJVMState pjvms(this); 870 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr(); 871 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness"); 872 Node* ex_oop = _gvn.transform(new CheckCastPPNode(control(), ex_node, tinst)); 873 push_ex_oop(ex_oop); // Push exception oop for handler 874 #ifndef PRODUCT 875 if (PrintOpto && WizardMode) { 876 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci); 877 klass->print_name(); 878 tty->cr(); 879 } 880 #endif 881 merge_exception(handler_bci); 882 } 883 set_control(not_subtype_ctrl); 884 885 // Come here if exception does not match handler. 886 // Carry on with more handler checks. 887 --remaining; 888 } 889 890 assert(!stopped(), "you should return if you finish the chain"); 891 892 // Oops, need to call into the VM to resolve the klasses at runtime. 893 // Note: This call must not deoptimize, since it is not a real at this bci! 894 kill_dead_locals(); 895 896 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW, 897 OptoRuntime::rethrow_Type(), 898 OptoRuntime::rethrow_stub(), 899 NULL, NULL, 900 ex_node); 901 902 // Rethrow is a pure call, no side effects, only a result. 903 // The result cannot be allocated, so we use I_O 904 905 // Catch exceptions from the rethrow 906 catch_call_exceptions(handlers); 907 } 908 909 910 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.) 911 912 913 #ifndef PRODUCT 914 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) { 915 if( CountCompiledCalls ) { 916 if( at_method_entry ) { 917 // bump invocation counter if top method (for statistics) 918 if (CountCompiledCalls && depth() == 1) { 919 const TypePtr* addr_type = TypeMetadataPtr::make(method()); 920 Node* adr1 = makecon(addr_type); 921 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset())); 922 increment_counter(adr2); 923 } 924 } else if (is_inline) { 925 switch (bc()) { 926 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break; 927 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break; 928 case Bytecodes::_invokestatic: 929 case Bytecodes::_invokedynamic: 930 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break; 931 default: fatal("unexpected call bytecode"); 932 } 933 } else { 934 switch (bc()) { 935 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break; 936 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break; 937 case Bytecodes::_invokestatic: 938 case Bytecodes::_invokedynamic: 939 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break; 940 default: fatal("unexpected call bytecode"); 941 } 942 } 943 } 944 } 945 #endif //PRODUCT 946 947 948 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, int bci, ciInstanceKlass* klass, 949 ciKlass* holder, ciMethod* callee, 950 const TypeOopPtr* receiver_type, bool is_virtual, 951 bool& call_does_dispatch, int& vtable_index) { 952 // Set default values for out-parameters. 953 call_does_dispatch = true; 954 vtable_index = Method::invalid_vtable_index; 955 956 // Choose call strategy. 957 ciMethod* optimized_virtual_method = optimize_inlining(caller, bci, klass, callee, receiver_type); 958 959 // Have the call been sufficiently improved such that it is no longer a virtual? 960 if (optimized_virtual_method != NULL) { 961 callee = optimized_virtual_method; 962 call_does_dispatch = false; 963 } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) { 964 // We can make a vtable call at this site 965 vtable_index = callee->resolve_vtable_index(caller->holder(), holder); 966 } 967 return callee; 968 } 969 970 // Identify possible target method and inlining style 971 ciMethod* Compile::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass, 972 ciMethod* callee, const TypeOopPtr* receiver_type) { 973 // only use for virtual or interface calls 974 975 // If it is obviously final, do not bother to call find_monomorphic_target, 976 // because the class hierarchy checks are not needed, and may fail due to 977 // incompletely loaded classes. Since we do our own class loading checks 978 // in this module, we may confidently bind to any method. 979 if (callee->can_be_statically_bound()) { 980 return callee; 981 } 982 983 // Attempt to improve the receiver 984 bool actual_receiver_is_exact = false; 985 ciInstanceKlass* actual_receiver = klass; 986 if (receiver_type != NULL) { 987 // Array methods are all inherited from Object, and are monomorphic. 988 // finalize() call on array is not allowed. 989 if (receiver_type->isa_aryptr() && 990 callee->holder() == env()->Object_klass() && 991 callee->name() != ciSymbol::finalize_method_name()) { 992 return callee; 993 } 994 995 // All other interesting cases are instance klasses. 996 if (!receiver_type->isa_instptr()) { 997 return NULL; 998 } 999 1000 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass(); 1001 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() && 1002 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) { 1003 // ikl is a same or better type than the original actual_receiver, 1004 // e.g. static receiver from bytecodes. 1005 actual_receiver = ikl; 1006 // Is the actual_receiver exact? 1007 actual_receiver_is_exact = receiver_type->klass_is_exact(); 1008 } 1009 } 1010 1011 ciInstanceKlass* calling_klass = caller->holder(); 1012 ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver); 1013 if (cha_monomorphic_target != NULL) { 1014 assert(!cha_monomorphic_target->is_abstract(), ""); 1015 // Look at the method-receiver type. Does it add "too much information"? 1016 ciKlass* mr_klass = cha_monomorphic_target->holder(); 1017 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass); 1018 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) { 1019 // Calling this method would include an implicit cast to its holder. 1020 // %%% Not yet implemented. Would throw minor asserts at present. 1021 // %%% The most common wins are already gained by +UseUniqueSubclasses. 1022 // To fix, put the higher_equal check at the call of this routine, 1023 // and add a CheckCastPP to the receiver. 1024 if (TraceDependencies) { 1025 tty->print_cr("found unique CHA method, but could not cast up"); 1026 tty->print(" method = "); 1027 cha_monomorphic_target->print(); 1028 tty->cr(); 1029 } 1030 if (log() != NULL) { 1031 log()->elem("missed_CHA_opportunity klass='%d' method='%d'", 1032 log()->identify(klass), 1033 log()->identify(cha_monomorphic_target)); 1034 } 1035 cha_monomorphic_target = NULL; 1036 } 1037 } 1038 if (cha_monomorphic_target != NULL) { 1039 // Hardwiring a virtual. 1040 // If we inlined because CHA revealed only a single target method, 1041 // then we are dependent on that target method not getting overridden 1042 // by dynamic class loading. Be sure to test the "static" receiver 1043 // dest_method here, as opposed to the actual receiver, which may 1044 // falsely lead us to believe that the receiver is final or private. 1045 dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target); 1046 return cha_monomorphic_target; 1047 } 1048 1049 // If the type is exact, we can still bind the method w/o a vcall. 1050 // (This case comes after CHA so we can see how much extra work it does.) 1051 if (actual_receiver_is_exact) { 1052 // In case of evolution, there is a dependence on every inlined method, since each 1053 // such method can be changed when its class is redefined. 1054 ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver); 1055 if (exact_method != NULL) { 1056 #ifndef PRODUCT 1057 if (PrintOpto) { 1058 tty->print(" Calling method via exact type @%d --- ", bci); 1059 exact_method->print_name(); 1060 tty->cr(); 1061 } 1062 #endif 1063 return exact_method; 1064 } 1065 } 1066 1067 return NULL; 1068 }