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