1 /* 2 * Copyright (c) 1997, 2019, 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 "compiler/compileLog.hpp" 27 #include "interpreter/linkResolver.hpp" 28 #include "memory/resourceArea.hpp" 29 #include "oops/method.hpp" 30 #include "opto/addnode.hpp" 31 #include "opto/c2compiler.hpp" 32 #include "opto/castnode.hpp" 33 #include "opto/idealGraphPrinter.hpp" 34 #include "opto/locknode.hpp" 35 #include "opto/memnode.hpp" 36 #include "opto/opaquenode.hpp" 37 #include "opto/parse.hpp" 38 #include "opto/rootnode.hpp" 39 #include "opto/runtime.hpp" 40 #include "runtime/arguments.hpp" 41 #include "runtime/handles.inline.hpp" 42 #include "runtime/safepointMechanism.hpp" 43 #include "runtime/sharedRuntime.hpp" 44 #include "utilities/copy.hpp" 45 46 // Static array so we can figure out which bytecodes stop us from compiling 47 // the most. Some of the non-static variables are needed in bytecodeInfo.cpp 48 // and eventually should be encapsulated in a proper class (gri 8/18/98). 49 50 #ifndef PRODUCT 51 int nodes_created = 0; 52 int methods_parsed = 0; 53 int methods_seen = 0; 54 int blocks_parsed = 0; 55 int blocks_seen = 0; 56 57 int explicit_null_checks_inserted = 0; 58 int explicit_null_checks_elided = 0; 59 int all_null_checks_found = 0; 60 int implicit_null_checks = 0; 61 62 bool Parse::BytecodeParseHistogram::_initialized = false; 63 uint Parse::BytecodeParseHistogram::_bytecodes_parsed [Bytecodes::number_of_codes]; 64 uint Parse::BytecodeParseHistogram::_nodes_constructed[Bytecodes::number_of_codes]; 65 uint Parse::BytecodeParseHistogram::_nodes_transformed[Bytecodes::number_of_codes]; 66 uint Parse::BytecodeParseHistogram::_new_values [Bytecodes::number_of_codes]; 67 68 //------------------------------print_statistics------------------------------- 69 void Parse::print_statistics() { 70 tty->print_cr("--- Compiler Statistics ---"); 71 tty->print("Methods seen: %d Methods parsed: %d", methods_seen, methods_parsed); 72 tty->print(" Nodes created: %d", nodes_created); 73 tty->cr(); 74 if (methods_seen != methods_parsed) { 75 tty->print_cr("Reasons for parse failures (NOT cumulative):"); 76 } 77 tty->print_cr("Blocks parsed: %d Blocks seen: %d", blocks_parsed, blocks_seen); 78 79 if (explicit_null_checks_inserted) { 80 tty->print_cr("%d original NULL checks - %d elided (%2d%%); optimizer leaves %d,", 81 explicit_null_checks_inserted, explicit_null_checks_elided, 82 (100*explicit_null_checks_elided)/explicit_null_checks_inserted, 83 all_null_checks_found); 84 } 85 if (all_null_checks_found) { 86 tty->print_cr("%d made implicit (%2d%%)", implicit_null_checks, 87 (100*implicit_null_checks)/all_null_checks_found); 88 } 89 if (SharedRuntime::_implicit_null_throws) { 90 tty->print_cr("%d implicit null exceptions at runtime", 91 SharedRuntime::_implicit_null_throws); 92 } 93 94 if (PrintParseStatistics && BytecodeParseHistogram::initialized()) { 95 BytecodeParseHistogram::print(); 96 } 97 } 98 #endif 99 100 //------------------------------ON STACK REPLACEMENT--------------------------- 101 102 // Construct a node which can be used to get incoming state for 103 // on stack replacement. 104 Node *Parse::fetch_interpreter_state(int index, 105 BasicType bt, 106 Node *local_addrs, 107 Node *local_addrs_base) { 108 Node *mem = memory(Compile::AliasIdxRaw); 109 Node *adr = basic_plus_adr( local_addrs_base, local_addrs, -index*wordSize ); 110 Node *ctl = control(); 111 112 // Very similar to LoadNode::make, except we handle un-aligned longs and 113 // doubles on Sparc. Intel can handle them just fine directly. 114 Node *l = NULL; 115 switch (bt) { // Signature is flattened 116 case T_INT: l = new LoadINode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeInt::INT, MemNode::unordered); break; 117 case T_FLOAT: l = new LoadFNode(ctl, mem, adr, TypeRawPtr::BOTTOM, Type::FLOAT, MemNode::unordered); break; 118 case T_ADDRESS: l = new LoadPNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM, MemNode::unordered); break; 119 case T_OBJECT: l = new LoadPNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeInstPtr::BOTTOM, MemNode::unordered); break; 120 case T_LONG: 121 case T_DOUBLE: { 122 // Since arguments are in reverse order, the argument address 'adr' 123 // refers to the back half of the long/double. Recompute adr. 124 adr = basic_plus_adr(local_addrs_base, local_addrs, -(index+1)*wordSize); 125 if (Matcher::misaligned_doubles_ok) { 126 l = (bt == T_DOUBLE) 127 ? (Node*)new LoadDNode(ctl, mem, adr, TypeRawPtr::BOTTOM, Type::DOUBLE, MemNode::unordered) 128 : (Node*)new LoadLNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeLong::LONG, MemNode::unordered); 129 } else { 130 l = (bt == T_DOUBLE) 131 ? (Node*)new LoadD_unalignedNode(ctl, mem, adr, TypeRawPtr::BOTTOM, MemNode::unordered) 132 : (Node*)new LoadL_unalignedNode(ctl, mem, adr, TypeRawPtr::BOTTOM, MemNode::unordered); 133 } 134 break; 135 } 136 default: ShouldNotReachHere(); 137 } 138 return _gvn.transform(l); 139 } 140 141 // Helper routine to prevent the interpreter from handing 142 // unexpected typestate to an OSR method. 143 // The Node l is a value newly dug out of the interpreter frame. 144 // The type is the type predicted by ciTypeFlow. Note that it is 145 // not a general type, but can only come from Type::get_typeflow_type. 146 // The safepoint is a map which will feed an uncommon trap. 147 Node* Parse::check_interpreter_type(Node* l, const Type* type, 148 SafePointNode* &bad_type_exit) { 149 150 const TypeOopPtr* tp = type->isa_oopptr(); 151 152 // TypeFlow may assert null-ness if a type appears unloaded. 153 if (type == TypePtr::NULL_PTR || 154 (tp != NULL && !tp->klass()->is_loaded())) { 155 // Value must be null, not a real oop. 156 Node* chk = _gvn.transform( new CmpPNode(l, null()) ); 157 Node* tst = _gvn.transform( new BoolNode(chk, BoolTest::eq) ); 158 IfNode* iff = create_and_map_if(control(), tst, PROB_MAX, COUNT_UNKNOWN); 159 set_control(_gvn.transform( new IfTrueNode(iff) )); 160 Node* bad_type = _gvn.transform( new IfFalseNode(iff) ); 161 bad_type_exit->control()->add_req(bad_type); 162 l = null(); 163 } 164 165 // Typeflow can also cut off paths from the CFG, based on 166 // types which appear unloaded, or call sites which appear unlinked. 167 // When paths are cut off, values at later merge points can rise 168 // toward more specific classes. Make sure these specific classes 169 // are still in effect. 170 if (tp != NULL && tp->klass() != C->env()->Object_klass()) { 171 // TypeFlow asserted a specific object type. Value must have that type. 172 Node* bad_type_ctrl = NULL; 173 l = gen_checkcast(l, makecon(TypeKlassPtr::make(tp->klass())), &bad_type_ctrl); 174 bad_type_exit->control()->add_req(bad_type_ctrl); 175 } 176 177 BasicType bt_l = _gvn.type(l)->basic_type(); 178 BasicType bt_t = type->basic_type(); 179 assert(_gvn.type(l)->higher_equal(type), "must constrain OSR typestate"); 180 return l; 181 } 182 183 // Helper routine which sets up elements of the initial parser map when 184 // performing a parse for on stack replacement. Add values into map. 185 // The only parameter contains the address of a interpreter arguments. 186 void Parse::load_interpreter_state(Node* osr_buf) { 187 int index; 188 int max_locals = jvms()->loc_size(); 189 int max_stack = jvms()->stk_size(); 190 191 192 // Mismatch between method and jvms can occur since map briefly held 193 // an OSR entry state (which takes up one RawPtr word). 194 assert(max_locals == method()->max_locals(), "sanity"); 195 assert(max_stack >= method()->max_stack(), "sanity"); 196 assert((int)jvms()->endoff() == TypeFunc::Parms + max_locals + max_stack, "sanity"); 197 assert((int)jvms()->endoff() == (int)map()->req(), "sanity"); 198 199 // Find the start block. 200 Block* osr_block = start_block(); 201 assert(osr_block->start() == osr_bci(), "sanity"); 202 203 // Set initial BCI. 204 set_parse_bci(osr_block->start()); 205 206 // Set initial stack depth. 207 set_sp(osr_block->start_sp()); 208 209 // Check bailouts. We currently do not perform on stack replacement 210 // of loops in catch blocks or loops which branch with a non-empty stack. 211 if (sp() != 0) { 212 C->record_method_not_compilable("OSR starts with non-empty stack"); 213 return; 214 } 215 // Do not OSR inside finally clauses: 216 if (osr_block->has_trap_at(osr_block->start())) { 217 C->record_method_not_compilable("OSR starts with an immediate trap"); 218 return; 219 } 220 221 // Commute monitors from interpreter frame to compiler frame. 222 assert(jvms()->monitor_depth() == 0, "should be no active locks at beginning of osr"); 223 int mcnt = osr_block->flow()->monitor_count(); 224 Node *monitors_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals+mcnt*2-1)*wordSize); 225 for (index = 0; index < mcnt; index++) { 226 // Make a BoxLockNode for the monitor. 227 Node *box = _gvn.transform(new BoxLockNode(next_monitor())); 228 229 230 // Displaced headers and locked objects are interleaved in the 231 // temp OSR buffer. We only copy the locked objects out here. 232 // Fetch the locked object from the OSR temp buffer and copy to our fastlock node. 233 Node *lock_object = fetch_interpreter_state(index*2, T_OBJECT, monitors_addr, osr_buf); 234 // Try and copy the displaced header to the BoxNode 235 Node *displaced_hdr = fetch_interpreter_state((index*2) + 1, T_ADDRESS, monitors_addr, osr_buf); 236 237 238 store_to_memory(control(), box, displaced_hdr, T_ADDRESS, Compile::AliasIdxRaw, MemNode::unordered); 239 240 // Build a bogus FastLockNode (no code will be generated) and push the 241 // monitor into our debug info. 242 const FastLockNode *flock = _gvn.transform(new FastLockNode( 0, lock_object, box ))->as_FastLock(); 243 map()->push_monitor(flock); 244 245 // If the lock is our method synchronization lock, tuck it away in 246 // _sync_lock for return and rethrow exit paths. 247 if (index == 0 && method()->is_synchronized()) { 248 _synch_lock = flock; 249 } 250 } 251 252 // Use the raw liveness computation to make sure that unexpected 253 // values don't propagate into the OSR frame. 254 MethodLivenessResult live_locals = method()->liveness_at_bci(osr_bci()); 255 if (!live_locals.is_valid()) { 256 // Degenerate or breakpointed method. 257 C->record_method_not_compilable("OSR in empty or breakpointed method"); 258 return; 259 } 260 261 // Extract the needed locals from the interpreter frame. 262 Node *locals_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals-1)*wordSize); 263 264 // find all the locals that the interpreter thinks contain live oops 265 const ResourceBitMap live_oops = method()->live_local_oops_at_bci(osr_bci()); 266 for (index = 0; index < max_locals; index++) { 267 268 if (!live_locals.at(index)) { 269 continue; 270 } 271 272 const Type *type = osr_block->local_type_at(index); 273 274 if (type->isa_oopptr() != NULL) { 275 276 // 6403625: Verify that the interpreter oopMap thinks that the oop is live 277 // else we might load a stale oop if the MethodLiveness disagrees with the 278 // result of the interpreter. If the interpreter says it is dead we agree 279 // by making the value go to top. 280 // 281 282 if (!live_oops.at(index)) { 283 if (C->log() != NULL) { 284 C->log()->elem("OSR_mismatch local_index='%d'",index); 285 } 286 set_local(index, null()); 287 // and ignore it for the loads 288 continue; 289 } 290 } 291 292 // Filter out TOP, HALF, and BOTTOM. (Cf. ensure_phi.) 293 if (type == Type::TOP || type == Type::HALF) { 294 continue; 295 } 296 // If the type falls to bottom, then this must be a local that 297 // is mixing ints and oops or some such. Forcing it to top 298 // makes it go dead. 299 if (type == Type::BOTTOM) { 300 continue; 301 } 302 // Construct code to access the appropriate local. 303 BasicType bt = type->basic_type(); 304 if (type == TypePtr::NULL_PTR) { 305 // Ptr types are mixed together with T_ADDRESS but NULL is 306 // really for T_OBJECT types so correct it. 307 bt = T_OBJECT; 308 } 309 Node *value = fetch_interpreter_state(index, bt, locals_addr, osr_buf); 310 set_local(index, value); 311 } 312 313 // Extract the needed stack entries from the interpreter frame. 314 for (index = 0; index < sp(); index++) { 315 const Type *type = osr_block->stack_type_at(index); 316 if (type != Type::TOP) { 317 // Currently the compiler bails out when attempting to on stack replace 318 // at a bci with a non-empty stack. We should not reach here. 319 ShouldNotReachHere(); 320 } 321 } 322 323 // End the OSR migration 324 make_runtime_call(RC_LEAF, OptoRuntime::osr_end_Type(), 325 CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end), 326 "OSR_migration_end", TypeRawPtr::BOTTOM, 327 osr_buf); 328 329 // Now that the interpreter state is loaded, make sure it will match 330 // at execution time what the compiler is expecting now: 331 SafePointNode* bad_type_exit = clone_map(); 332 bad_type_exit->set_control(new RegionNode(1)); 333 334 assert(osr_block->flow()->jsrs()->size() == 0, "should be no jsrs live at osr point"); 335 for (index = 0; index < max_locals; index++) { 336 if (stopped()) break; 337 Node* l = local(index); 338 if (l->is_top()) continue; // nothing here 339 const Type *type = osr_block->local_type_at(index); 340 if (type->isa_oopptr() != NULL) { 341 if (!live_oops.at(index)) { 342 // skip type check for dead oops 343 continue; 344 } 345 } 346 if (osr_block->flow()->local_type_at(index)->is_return_address()) { 347 // In our current system it's illegal for jsr addresses to be 348 // live into an OSR entry point because the compiler performs 349 // inlining of jsrs. ciTypeFlow has a bailout that detect this 350 // case and aborts the compile if addresses are live into an OSR 351 // entry point. Because of that we can assume that any address 352 // locals at the OSR entry point are dead. Method liveness 353 // isn't precise enought to figure out that they are dead in all 354 // cases so simply skip checking address locals all 355 // together. Any type check is guaranteed to fail since the 356 // interpreter type is the result of a load which might have any 357 // value and the expected type is a constant. 358 continue; 359 } 360 set_local(index, check_interpreter_type(l, type, bad_type_exit)); 361 } 362 363 for (index = 0; index < sp(); index++) { 364 if (stopped()) break; 365 Node* l = stack(index); 366 if (l->is_top()) continue; // nothing here 367 const Type *type = osr_block->stack_type_at(index); 368 set_stack(index, check_interpreter_type(l, type, bad_type_exit)); 369 } 370 371 if (bad_type_exit->control()->req() > 1) { 372 // Build an uncommon trap here, if any inputs can be unexpected. 373 bad_type_exit->set_control(_gvn.transform( bad_type_exit->control() )); 374 record_for_igvn(bad_type_exit->control()); 375 SafePointNode* types_are_good = map(); 376 set_map(bad_type_exit); 377 // The unexpected type happens because a new edge is active 378 // in the CFG, which typeflow had previously ignored. 379 // E.g., Object x = coldAtFirst() && notReached()? "str": new Integer(123). 380 // This x will be typed as Integer if notReached is not yet linked. 381 // It could also happen due to a problem in ciTypeFlow analysis. 382 uncommon_trap(Deoptimization::Reason_constraint, 383 Deoptimization::Action_reinterpret); 384 set_map(types_are_good); 385 } 386 } 387 388 //------------------------------Parse------------------------------------------ 389 // Main parser constructor. 390 Parse::Parse(JVMState* caller, ciMethod* parse_method, float expected_uses) 391 : _exits(caller) 392 { 393 // Init some variables 394 _caller = caller; 395 _method = parse_method; 396 _expected_uses = expected_uses; 397 _depth = 1 + (caller->has_method() ? caller->depth() : 0); 398 _wrote_final = false; 399 _wrote_volatile = false; 400 _wrote_stable = false; 401 _wrote_fields = false; 402 _alloc_with_final = NULL; 403 _entry_bci = InvocationEntryBci; 404 _tf = NULL; 405 _block = NULL; 406 _first_return = true; 407 _replaced_nodes_for_exceptions = false; 408 _new_idx = C->unique(); 409 debug_only(_block_count = -1); 410 debug_only(_blocks = (Block*)-1); 411 #ifndef PRODUCT 412 if (PrintCompilation || PrintOpto) { 413 // Make sure I have an inline tree, so I can print messages about it. 414 JVMState* ilt_caller = is_osr_parse() ? caller->caller() : caller; 415 InlineTree::find_subtree_from_root(C->ilt(), ilt_caller, parse_method); 416 } 417 _max_switch_depth = 0; 418 _est_switch_depth = 0; 419 #endif 420 421 if (parse_method->has_reserved_stack_access()) { 422 C->set_has_reserved_stack_access(true); 423 } 424 425 _tf = TypeFunc::make(method()); 426 _iter.reset_to_method(method()); 427 _flow = method()->get_flow_analysis(); 428 if (_flow->failing()) { 429 C->record_method_not_compilable(_flow->failure_reason()); 430 } 431 432 #ifndef PRODUCT 433 if (_flow->has_irreducible_entry()) { 434 C->set_parsed_irreducible_loop(true); 435 } 436 #endif 437 438 if (_expected_uses <= 0) { 439 _prof_factor = 1; 440 } else { 441 float prof_total = parse_method->interpreter_invocation_count(); 442 if (prof_total <= _expected_uses) { 443 _prof_factor = 1; 444 } else { 445 _prof_factor = _expected_uses / prof_total; 446 } 447 } 448 449 CompileLog* log = C->log(); 450 if (log != NULL) { 451 log->begin_head("parse method='%d' uses='%f'", 452 log->identify(parse_method), expected_uses); 453 if (depth() == 1 && C->is_osr_compilation()) { 454 log->print(" osr_bci='%d'", C->entry_bci()); 455 } 456 log->stamp(); 457 log->end_head(); 458 } 459 460 // Accumulate deoptimization counts. 461 // (The range_check and store_check counts are checked elsewhere.) 462 ciMethodData* md = method()->method_data(); 463 for (uint reason = 0; reason < md->trap_reason_limit(); reason++) { 464 uint md_count = md->trap_count(reason); 465 if (md_count != 0) { 466 if (md_count == md->trap_count_limit()) 467 md_count += md->overflow_trap_count(); 468 uint total_count = C->trap_count(reason); 469 uint old_count = total_count; 470 total_count += md_count; 471 // Saturate the add if it overflows. 472 if (total_count < old_count || total_count < md_count) 473 total_count = (uint)-1; 474 C->set_trap_count(reason, total_count); 475 if (log != NULL) 476 log->elem("observe trap='%s' count='%d' total='%d'", 477 Deoptimization::trap_reason_name(reason), 478 md_count, total_count); 479 } 480 } 481 // Accumulate total sum of decompilations, also. 482 C->set_decompile_count(C->decompile_count() + md->decompile_count()); 483 484 _count_invocations = C->do_count_invocations(); 485 _method_data_update = C->do_method_data_update(); 486 487 if (log != NULL && method()->has_exception_handlers()) { 488 log->elem("observe that='has_exception_handlers'"); 489 } 490 491 assert(InlineTree::check_can_parse(method()) == NULL, "Can not parse this method, cutout earlier"); 492 assert(method()->has_balanced_monitors(), "Can not parse unbalanced monitors, cutout earlier"); 493 494 // Always register dependence if JVMTI is enabled, because 495 // either breakpoint setting or hotswapping of methods may 496 // cause deoptimization. 497 if (C->env()->jvmti_can_hotswap_or_post_breakpoint()) { 498 C->dependencies()->assert_evol_method(method()); 499 } 500 501 NOT_PRODUCT(methods_seen++); 502 503 // Do some special top-level things. 504 if (depth() == 1 && C->is_osr_compilation()) { 505 _entry_bci = C->entry_bci(); 506 _flow = method()->get_osr_flow_analysis(osr_bci()); 507 if (_flow->failing()) { 508 C->record_method_not_compilable(_flow->failure_reason()); 509 #ifndef PRODUCT 510 if (PrintOpto && (Verbose || WizardMode)) { 511 tty->print_cr("OSR @%d type flow bailout: %s", _entry_bci, _flow->failure_reason()); 512 if (Verbose) { 513 method()->print(); 514 method()->print_codes(); 515 _flow->print(); 516 } 517 } 518 #endif 519 } 520 _tf = C->tf(); // the OSR entry type is different 521 } 522 523 #ifdef ASSERT 524 if (depth() == 1) { 525 assert(C->is_osr_compilation() == this->is_osr_parse(), "OSR in sync"); 526 if (C->tf() != tf()) { 527 assert(C->env()->system_dictionary_modification_counter_changed(), 528 "Must invalidate if TypeFuncs differ"); 529 } 530 } else { 531 assert(!this->is_osr_parse(), "no recursive OSR"); 532 } 533 #endif 534 535 #ifndef PRODUCT 536 methods_parsed++; 537 // add method size here to guarantee that inlined methods are added too 538 if (CITime) 539 _total_bytes_compiled += method()->code_size(); 540 541 show_parse_info(); 542 #endif 543 544 if (failing()) { 545 if (log) log->done("parse"); 546 return; 547 } 548 549 gvn().set_type(root(), root()->bottom_type()); 550 gvn().transform(top()); 551 552 // Import the results of the ciTypeFlow. 553 init_blocks(); 554 555 // Merge point for all normal exits 556 build_exits(); 557 558 // Setup the initial JVM state map. 559 SafePointNode* entry_map = create_entry_map(); 560 561 // Check for bailouts during map initialization 562 if (failing() || entry_map == NULL) { 563 if (log) log->done("parse"); 564 return; 565 } 566 567 Node_Notes* caller_nn = C->default_node_notes(); 568 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls. 569 if (DebugInlinedCalls || depth() == 1) { 570 C->set_default_node_notes(make_node_notes(caller_nn)); 571 } 572 573 if (is_osr_parse()) { 574 Node* osr_buf = entry_map->in(TypeFunc::Parms+0); 575 entry_map->set_req(TypeFunc::Parms+0, top()); 576 set_map(entry_map); 577 load_interpreter_state(osr_buf); 578 } else { 579 set_map(entry_map); 580 do_method_entry(); 581 if (depth() == 1 && C->age_code()) { 582 decrement_age(); 583 } 584 } 585 586 if (depth() == 1 && !failing()) { 587 // Add check to deoptimize the nmethod if RTM state was changed 588 rtm_deopt(); 589 } 590 591 // Check for bailouts during method entry or RTM state check setup. 592 if (failing()) { 593 if (log) log->done("parse"); 594 C->set_default_node_notes(caller_nn); 595 return; 596 } 597 598 entry_map = map(); // capture any changes performed by method setup code 599 assert(jvms()->endoff() == map()->req(), "map matches JVMS layout"); 600 601 // We begin parsing as if we have just encountered a jump to the 602 // method entry. 603 Block* entry_block = start_block(); 604 assert(entry_block->start() == (is_osr_parse() ? osr_bci() : 0), ""); 605 set_map_clone(entry_map); 606 merge_common(entry_block, entry_block->next_path_num()); 607 608 #ifndef PRODUCT 609 BytecodeParseHistogram *parse_histogram_obj = new (C->env()->arena()) BytecodeParseHistogram(this, C); 610 set_parse_histogram( parse_histogram_obj ); 611 #endif 612 613 // Parse all the basic blocks. 614 do_all_blocks(); 615 616 C->set_default_node_notes(caller_nn); 617 618 // Check for bailouts during conversion to graph 619 if (failing()) { 620 if (log) log->done("parse"); 621 return; 622 } 623 624 // Fix up all exiting control flow. 625 set_map(entry_map); 626 do_exits(); 627 628 if (log) log->done("parse nodes='%d' live='%d' memory='" SIZE_FORMAT "'", 629 C->unique(), C->live_nodes(), C->node_arena()->used()); 630 } 631 632 //---------------------------do_all_blocks------------------------------------- 633 void Parse::do_all_blocks() { 634 bool has_irreducible = flow()->has_irreducible_entry(); 635 636 // Walk over all blocks in Reverse Post-Order. 637 while (true) { 638 bool progress = false; 639 for (int rpo = 0; rpo < block_count(); rpo++) { 640 Block* block = rpo_at(rpo); 641 642 if (block->is_parsed()) continue; 643 644 if (!block->is_merged()) { 645 // Dead block, no state reaches this block 646 continue; 647 } 648 649 // Prepare to parse this block. 650 load_state_from(block); 651 652 if (stopped()) { 653 // Block is dead. 654 continue; 655 } 656 657 NOT_PRODUCT(blocks_parsed++); 658 659 progress = true; 660 if (block->is_loop_head() || block->is_handler() || (has_irreducible && !block->is_ready())) { 661 // Not all preds have been parsed. We must build phis everywhere. 662 // (Note that dead locals do not get phis built, ever.) 663 ensure_phis_everywhere(); 664 665 if (block->is_SEL_head()) { 666 // Add predicate to single entry (not irreducible) loop head. 667 assert(!block->has_merged_backedge(), "only entry paths should be merged for now"); 668 // Predicates may have been added after a dominating if 669 if (!block->has_predicates()) { 670 // Need correct bci for predicate. 671 // It is fine to set it here since do_one_block() will set it anyway. 672 set_parse_bci(block->start()); 673 add_predicate(); 674 } 675 // Add new region for back branches. 676 int edges = block->pred_count() - block->preds_parsed() + 1; // +1 for original region 677 RegionNode *r = new RegionNode(edges+1); 678 _gvn.set_type(r, Type::CONTROL); 679 record_for_igvn(r); 680 r->init_req(edges, control()); 681 set_control(r); 682 // Add new phis. 683 ensure_phis_everywhere(); 684 } 685 686 // Leave behind an undisturbed copy of the map, for future merges. 687 set_map(clone_map()); 688 } 689 690 if (control()->is_Region() && !block->is_loop_head() && !has_irreducible && !block->is_handler()) { 691 // In the absence of irreducible loops, the Region and Phis 692 // associated with a merge that doesn't involve a backedge can 693 // be simplified now since the RPO parsing order guarantees 694 // that any path which was supposed to reach here has already 695 // been parsed or must be dead. 696 Node* c = control(); 697 Node* result = _gvn.transform_no_reclaim(control()); 698 if (c != result && TraceOptoParse) { 699 tty->print_cr("Block #%d replace %d with %d", block->rpo(), c->_idx, result->_idx); 700 } 701 if (result != top()) { 702 record_for_igvn(result); 703 } 704 } 705 706 // Parse the block. 707 do_one_block(); 708 709 // Check for bailouts. 710 if (failing()) return; 711 } 712 713 // with irreducible loops multiple passes might be necessary to parse everything 714 if (!has_irreducible || !progress) { 715 break; 716 } 717 } 718 719 #ifndef PRODUCT 720 blocks_seen += block_count(); 721 722 // Make sure there are no half-processed blocks remaining. 723 // Every remaining unprocessed block is dead and may be ignored now. 724 for (int rpo = 0; rpo < block_count(); rpo++) { 725 Block* block = rpo_at(rpo); 726 if (!block->is_parsed()) { 727 if (TraceOptoParse) { 728 tty->print_cr("Skipped dead block %d at bci:%d", rpo, block->start()); 729 } 730 assert(!block->is_merged(), "no half-processed blocks"); 731 } 732 } 733 #endif 734 } 735 736 static Node* mask_int_value(Node* v, BasicType bt, PhaseGVN* gvn) { 737 switch (bt) { 738 case T_BYTE: 739 v = gvn->transform(new LShiftINode(v, gvn->intcon(24))); 740 v = gvn->transform(new RShiftINode(v, gvn->intcon(24))); 741 break; 742 case T_SHORT: 743 v = gvn->transform(new LShiftINode(v, gvn->intcon(16))); 744 v = gvn->transform(new RShiftINode(v, gvn->intcon(16))); 745 break; 746 case T_CHAR: 747 v = gvn->transform(new AndINode(v, gvn->intcon(0xFFFF))); 748 break; 749 case T_BOOLEAN: 750 v = gvn->transform(new AndINode(v, gvn->intcon(0x1))); 751 break; 752 default: 753 break; 754 } 755 return v; 756 } 757 758 //-------------------------------build_exits---------------------------------- 759 // Build normal and exceptional exit merge points. 760 void Parse::build_exits() { 761 // make a clone of caller to prevent sharing of side-effects 762 _exits.set_map(_exits.clone_map()); 763 _exits.clean_stack(_exits.sp()); 764 _exits.sync_jvms(); 765 766 RegionNode* region = new RegionNode(1); 767 record_for_igvn(region); 768 gvn().set_type_bottom(region); 769 _exits.set_control(region); 770 771 // Note: iophi and memphi are not transformed until do_exits. 772 Node* iophi = new PhiNode(region, Type::ABIO); 773 Node* memphi = new PhiNode(region, Type::MEMORY, TypePtr::BOTTOM); 774 gvn().set_type_bottom(iophi); 775 gvn().set_type_bottom(memphi); 776 _exits.set_i_o(iophi); 777 _exits.set_all_memory(memphi); 778 779 // Add a return value to the exit state. (Do not push it yet.) 780 if (tf()->range()->cnt() > TypeFunc::Parms) { 781 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms); 782 if (ret_type->isa_int()) { 783 BasicType ret_bt = method()->return_type()->basic_type(); 784 if (ret_bt == T_BOOLEAN || 785 ret_bt == T_CHAR || 786 ret_bt == T_BYTE || 787 ret_bt == T_SHORT) { 788 ret_type = TypeInt::INT; 789 } 790 } 791 792 // Don't "bind" an unloaded return klass to the ret_phi. If the klass 793 // becomes loaded during the subsequent parsing, the loaded and unloaded 794 // types will not join when we transform and push in do_exits(). 795 const TypeOopPtr* ret_oop_type = ret_type->isa_oopptr(); 796 if (ret_oop_type && !ret_oop_type->klass()->is_loaded()) { 797 ret_type = TypeOopPtr::BOTTOM; 798 } 799 int ret_size = type2size[ret_type->basic_type()]; 800 Node* ret_phi = new PhiNode(region, ret_type); 801 gvn().set_type_bottom(ret_phi); 802 _exits.ensure_stack(ret_size); 803 assert((int)(tf()->range()->cnt() - TypeFunc::Parms) == ret_size, "good tf range"); 804 assert(method()->return_type()->size() == ret_size, "tf agrees w/ method"); 805 _exits.set_argument(0, ret_phi); // here is where the parser finds it 806 // Note: ret_phi is not yet pushed, until do_exits. 807 } 808 } 809 810 811 //----------------------------build_start_state------------------------------- 812 // Construct a state which contains only the incoming arguments from an 813 // unknown caller. The method & bci will be NULL & InvocationEntryBci. 814 JVMState* Compile::build_start_state(StartNode* start, const TypeFunc* tf) { 815 int arg_size = tf->domain()->cnt(); 816 int max_size = MAX2(arg_size, (int)tf->range()->cnt()); 817 JVMState* jvms = new (this) JVMState(max_size - TypeFunc::Parms); 818 SafePointNode* map = new SafePointNode(max_size, NULL); 819 record_for_igvn(map); 820 assert(arg_size == TypeFunc::Parms + (is_osr_compilation() ? 1 : method()->arg_size()), "correct arg_size"); 821 Node_Notes* old_nn = default_node_notes(); 822 if (old_nn != NULL && has_method()) { 823 Node_Notes* entry_nn = old_nn->clone(this); 824 JVMState* entry_jvms = new(this) JVMState(method(), old_nn->jvms()); 825 entry_jvms->set_offsets(0); 826 entry_jvms->set_bci(entry_bci()); 827 entry_nn->set_jvms(entry_jvms); 828 set_default_node_notes(entry_nn); 829 } 830 uint i; 831 for (i = 0; i < (uint)arg_size; i++) { 832 Node* parm = initial_gvn()->transform(new ParmNode(start, i)); 833 map->init_req(i, parm); 834 // Record all these guys for later GVN. 835 record_for_igvn(parm); 836 } 837 for (; i < map->req(); i++) { 838 map->init_req(i, top()); 839 } 840 assert(jvms->argoff() == TypeFunc::Parms, "parser gets arguments here"); 841 set_default_node_notes(old_nn); 842 map->set_jvms(jvms); 843 jvms->set_map(map); 844 return jvms; 845 } 846 847 //-----------------------------make_node_notes--------------------------------- 848 Node_Notes* Parse::make_node_notes(Node_Notes* caller_nn) { 849 if (caller_nn == NULL) return NULL; 850 Node_Notes* nn = caller_nn->clone(C); 851 JVMState* caller_jvms = nn->jvms(); 852 JVMState* jvms = new (C) JVMState(method(), caller_jvms); 853 jvms->set_offsets(0); 854 jvms->set_bci(_entry_bci); 855 nn->set_jvms(jvms); 856 return nn; 857 } 858 859 860 //--------------------------return_values-------------------------------------- 861 void Compile::return_values(JVMState* jvms) { 862 GraphKit kit(jvms); 863 Node* ret = new ReturnNode(TypeFunc::Parms, 864 kit.control(), 865 kit.i_o(), 866 kit.reset_memory(), 867 kit.frameptr(), 868 kit.returnadr()); 869 // Add zero or 1 return values 870 int ret_size = tf()->range()->cnt() - TypeFunc::Parms; 871 if (ret_size > 0) { 872 kit.inc_sp(-ret_size); // pop the return value(s) 873 kit.sync_jvms(); 874 ret->add_req(kit.argument(0)); 875 // Note: The second dummy edge is not needed by a ReturnNode. 876 } 877 // bind it to root 878 root()->add_req(ret); 879 record_for_igvn(ret); 880 initial_gvn()->transform_no_reclaim(ret); 881 } 882 883 //------------------------rethrow_exceptions----------------------------------- 884 // Bind all exception states in the list into a single RethrowNode. 885 void Compile::rethrow_exceptions(JVMState* jvms) { 886 GraphKit kit(jvms); 887 if (!kit.has_exceptions()) return; // nothing to generate 888 // Load my combined exception state into the kit, with all phis transformed: 889 SafePointNode* ex_map = kit.combine_and_pop_all_exception_states(); 890 Node* ex_oop = kit.use_exception_state(ex_map); 891 RethrowNode* exit = new RethrowNode(kit.control(), 892 kit.i_o(), kit.reset_memory(), 893 kit.frameptr(), kit.returnadr(), 894 // like a return but with exception input 895 ex_oop); 896 // bind to root 897 root()->add_req(exit); 898 record_for_igvn(exit); 899 initial_gvn()->transform_no_reclaim(exit); 900 } 901 902 //---------------------------do_exceptions------------------------------------- 903 // Process exceptions arising from the current bytecode. 904 // Send caught exceptions to the proper handler within this method. 905 // Unhandled exceptions feed into _exit. 906 void Parse::do_exceptions() { 907 if (!has_exceptions()) return; 908 909 if (failing()) { 910 // Pop them all off and throw them away. 911 while (pop_exception_state() != NULL) ; 912 return; 913 } 914 915 PreserveJVMState pjvms(this, false); 916 917 SafePointNode* ex_map; 918 while ((ex_map = pop_exception_state()) != NULL) { 919 if (!method()->has_exception_handlers()) { 920 // Common case: Transfer control outward. 921 // Doing it this early allows the exceptions to common up 922 // even between adjacent method calls. 923 throw_to_exit(ex_map); 924 } else { 925 // Have to look at the exception first. 926 assert(stopped(), "catch_inline_exceptions trashes the map"); 927 catch_inline_exceptions(ex_map); 928 stop_and_kill_map(); // we used up this exception state; kill it 929 } 930 } 931 932 // We now return to our regularly scheduled program: 933 } 934 935 //---------------------------throw_to_exit------------------------------------- 936 // Merge the given map into an exception exit from this method. 937 // The exception exit will handle any unlocking of receiver. 938 // The ex_oop must be saved within the ex_map, unlike merge_exception. 939 void Parse::throw_to_exit(SafePointNode* ex_map) { 940 // Pop the JVMS to (a copy of) the caller. 941 GraphKit caller; 942 caller.set_map_clone(_caller->map()); 943 caller.set_bci(_caller->bci()); 944 caller.set_sp(_caller->sp()); 945 // Copy out the standard machine state: 946 for (uint i = 0; i < TypeFunc::Parms; i++) { 947 caller.map()->set_req(i, ex_map->in(i)); 948 } 949 if (ex_map->has_replaced_nodes()) { 950 _replaced_nodes_for_exceptions = true; 951 } 952 caller.map()->transfer_replaced_nodes_from(ex_map, _new_idx); 953 // ...and the exception: 954 Node* ex_oop = saved_ex_oop(ex_map); 955 SafePointNode* caller_ex_map = caller.make_exception_state(ex_oop); 956 // Finally, collect the new exception state in my exits: 957 _exits.add_exception_state(caller_ex_map); 958 } 959 960 //------------------------------do_exits--------------------------------------- 961 void Parse::do_exits() { 962 set_parse_bci(InvocationEntryBci); 963 964 // Now peephole on the return bits 965 Node* region = _exits.control(); 966 _exits.set_control(gvn().transform(region)); 967 968 Node* iophi = _exits.i_o(); 969 _exits.set_i_o(gvn().transform(iophi)); 970 971 // Figure out if we need to emit the trailing barrier. The barrier is only 972 // needed in the constructors, and only in three cases: 973 // 974 // 1. The constructor wrote a final. The effects of all initializations 975 // must be committed to memory before any code after the constructor 976 // publishes the reference to the newly constructed object. Rather 977 // than wait for the publication, we simply block the writes here. 978 // Rather than put a barrier on only those writes which are required 979 // to complete, we force all writes to complete. 980 // 981 // 2. On PPC64, also add MemBarRelease for constructors which write 982 // volatile fields. As support_IRIW_for_not_multiple_copy_atomic_cpu 983 // is set on PPC64, no sync instruction is issued after volatile 984 // stores. We want to guarantee the same behavior as on platforms 985 // with total store order, although this is not required by the Java 986 // memory model. So as with finals, we add a barrier here. 987 // 988 // 3. Experimental VM option is used to force the barrier if any field 989 // was written out in the constructor. 990 // 991 // "All bets are off" unless the first publication occurs after a 992 // normal return from the constructor. We do not attempt to detect 993 // such unusual early publications. But no barrier is needed on 994 // exceptional returns, since they cannot publish normally. 995 // 996 if (method()->is_initializer() && 997 (wrote_final() || 998 PPC64_ONLY(wrote_volatile() ||) 999 (AlwaysSafeConstructors && wrote_fields()))) { 1000 _exits.insert_mem_bar(Op_MemBarRelease, alloc_with_final()); 1001 1002 // If Memory barrier is created for final fields write 1003 // and allocation node does not escape the initialize method, 1004 // then barrier introduced by allocation node can be removed. 1005 if (DoEscapeAnalysis && alloc_with_final()) { 1006 AllocateNode *alloc = AllocateNode::Ideal_allocation(alloc_with_final(), &_gvn); 1007 alloc->compute_MemBar_redundancy(method()); 1008 } 1009 if (PrintOpto && (Verbose || WizardMode)) { 1010 method()->print_name(); 1011 tty->print_cr(" writes finals and needs a memory barrier"); 1012 } 1013 } 1014 1015 // Any method can write a @Stable field; insert memory barriers 1016 // after those also. Can't bind predecessor allocation node (if any) 1017 // with barrier because allocation doesn't always dominate 1018 // MemBarRelease. 1019 if (wrote_stable()) { 1020 _exits.insert_mem_bar(Op_MemBarRelease); 1021 if (PrintOpto && (Verbose || WizardMode)) { 1022 method()->print_name(); 1023 tty->print_cr(" writes @Stable and needs a memory barrier"); 1024 } 1025 } 1026 1027 for (MergeMemStream mms(_exits.merged_memory()); mms.next_non_empty(); ) { 1028 // transform each slice of the original memphi: 1029 mms.set_memory(_gvn.transform(mms.memory())); 1030 } 1031 1032 if (tf()->range()->cnt() > TypeFunc::Parms) { 1033 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms); 1034 Node* ret_phi = _gvn.transform( _exits.argument(0) ); 1035 if (!_exits.control()->is_top() && _gvn.type(ret_phi)->empty()) { 1036 // In case of concurrent class loading, the type we set for the 1037 // ret_phi in build_exits() may have been too optimistic and the 1038 // ret_phi may be top now. 1039 // Otherwise, we've encountered an error and have to mark the method as 1040 // not compilable. Just using an assertion instead would be dangerous 1041 // as this could lead to an infinite compile loop in non-debug builds. 1042 { 1043 if (C->env()->system_dictionary_modification_counter_changed()) { 1044 C->record_failure(C2Compiler::retry_class_loading_during_parsing()); 1045 } else { 1046 C->record_method_not_compilable("Can't determine return type."); 1047 } 1048 } 1049 return; 1050 } 1051 if (ret_type->isa_int()) { 1052 BasicType ret_bt = method()->return_type()->basic_type(); 1053 ret_phi = mask_int_value(ret_phi, ret_bt, &_gvn); 1054 } 1055 _exits.push_node(ret_type->basic_type(), ret_phi); 1056 } 1057 1058 // Note: Logic for creating and optimizing the ReturnNode is in Compile. 1059 1060 // Unlock along the exceptional paths. 1061 // This is done late so that we can common up equivalent exceptions 1062 // (e.g., null checks) arising from multiple points within this method. 1063 // See GraphKit::add_exception_state, which performs the commoning. 1064 bool do_synch = method()->is_synchronized() && GenerateSynchronizationCode; 1065 1066 // record exit from a method if compiled while Dtrace is turned on. 1067 if (do_synch || C->env()->dtrace_method_probes() || _replaced_nodes_for_exceptions) { 1068 // First move the exception list out of _exits: 1069 GraphKit kit(_exits.transfer_exceptions_into_jvms()); 1070 SafePointNode* normal_map = kit.map(); // keep this guy safe 1071 // Now re-collect the exceptions into _exits: 1072 SafePointNode* ex_map; 1073 while ((ex_map = kit.pop_exception_state()) != NULL) { 1074 Node* ex_oop = kit.use_exception_state(ex_map); 1075 // Force the exiting JVM state to have this method at InvocationEntryBci. 1076 // The exiting JVM state is otherwise a copy of the calling JVMS. 1077 JVMState* caller = kit.jvms(); 1078 JVMState* ex_jvms = caller->clone_shallow(C); 1079 ex_jvms->set_map(kit.clone_map()); 1080 ex_jvms->map()->set_jvms(ex_jvms); 1081 ex_jvms->set_bci( InvocationEntryBci); 1082 kit.set_jvms(ex_jvms); 1083 if (do_synch) { 1084 // Add on the synchronized-method box/object combo 1085 kit.map()->push_monitor(_synch_lock); 1086 // Unlock! 1087 kit.shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node()); 1088 } 1089 if (C->env()->dtrace_method_probes()) { 1090 kit.make_dtrace_method_exit(method()); 1091 } 1092 if (_replaced_nodes_for_exceptions) { 1093 kit.map()->apply_replaced_nodes(_new_idx); 1094 } 1095 // Done with exception-path processing. 1096 ex_map = kit.make_exception_state(ex_oop); 1097 assert(ex_jvms->same_calls_as(ex_map->jvms()), "sanity"); 1098 // Pop the last vestige of this method: 1099 ex_map->set_jvms(caller->clone_shallow(C)); 1100 ex_map->jvms()->set_map(ex_map); 1101 _exits.push_exception_state(ex_map); 1102 } 1103 assert(_exits.map() == normal_map, "keep the same return state"); 1104 } 1105 1106 { 1107 // Capture very early exceptions (receiver null checks) from caller JVMS 1108 GraphKit caller(_caller); 1109 SafePointNode* ex_map; 1110 while ((ex_map = caller.pop_exception_state()) != NULL) { 1111 _exits.add_exception_state(ex_map); 1112 } 1113 } 1114 _exits.map()->apply_replaced_nodes(_new_idx); 1115 } 1116 1117 //-----------------------------create_entry_map------------------------------- 1118 // Initialize our parser map to contain the types at method entry. 1119 // For OSR, the map contains a single RawPtr parameter. 1120 // Initial monitor locking for sync. methods is performed by do_method_entry. 1121 SafePointNode* Parse::create_entry_map() { 1122 // Check for really stupid bail-out cases. 1123 uint len = TypeFunc::Parms + method()->max_locals() + method()->max_stack(); 1124 if (len >= 32760) { 1125 C->record_method_not_compilable("too many local variables"); 1126 return NULL; 1127 } 1128 1129 // clear current replaced nodes that are of no use from here on (map was cloned in build_exits). 1130 _caller->map()->delete_replaced_nodes(); 1131 1132 // If this is an inlined method, we may have to do a receiver null check. 1133 if (_caller->has_method() && is_normal_parse() && !method()->is_static()) { 1134 GraphKit kit(_caller); 1135 kit.null_check_receiver_before_call(method()); 1136 _caller = kit.transfer_exceptions_into_jvms(); 1137 if (kit.stopped()) { 1138 _exits.add_exception_states_from(_caller); 1139 _exits.set_jvms(_caller); 1140 return NULL; 1141 } 1142 } 1143 1144 assert(method() != NULL, "parser must have a method"); 1145 1146 // Create an initial safepoint to hold JVM state during parsing 1147 JVMState* jvms = new (C) JVMState(method(), _caller->has_method() ? _caller : NULL); 1148 set_map(new SafePointNode(len, jvms)); 1149 jvms->set_map(map()); 1150 record_for_igvn(map()); 1151 assert(jvms->endoff() == len, "correct jvms sizing"); 1152 1153 SafePointNode* inmap = _caller->map(); 1154 assert(inmap != NULL, "must have inmap"); 1155 // In case of null check on receiver above 1156 map()->transfer_replaced_nodes_from(inmap, _new_idx); 1157 1158 uint i; 1159 1160 // Pass thru the predefined input parameters. 1161 for (i = 0; i < TypeFunc::Parms; i++) { 1162 map()->init_req(i, inmap->in(i)); 1163 } 1164 1165 if (depth() == 1) { 1166 assert(map()->memory()->Opcode() == Op_Parm, ""); 1167 // Insert the memory aliasing node 1168 set_all_memory(reset_memory()); 1169 } 1170 assert(merged_memory(), ""); 1171 1172 // Now add the locals which are initially bound to arguments: 1173 uint arg_size = tf()->domain()->cnt(); 1174 ensure_stack(arg_size - TypeFunc::Parms); // OSR methods have funny args 1175 for (i = TypeFunc::Parms; i < arg_size; i++) { 1176 map()->init_req(i, inmap->argument(_caller, i - TypeFunc::Parms)); 1177 } 1178 1179 // Clear out the rest of the map (locals and stack) 1180 for (i = arg_size; i < len; i++) { 1181 map()->init_req(i, top()); 1182 } 1183 1184 SafePointNode* entry_map = stop(); 1185 return entry_map; 1186 } 1187 1188 //-----------------------------do_method_entry-------------------------------- 1189 // Emit any code needed in the pseudo-block before BCI zero. 1190 // The main thing to do is lock the receiver of a synchronized method. 1191 void Parse::do_method_entry() { 1192 set_parse_bci(InvocationEntryBci); // Pseudo-BCP 1193 set_sp(0); // Java Stack Pointer 1194 1195 NOT_PRODUCT( count_compiled_calls(true/*at_method_entry*/, false/*is_inline*/); ) 1196 1197 if (C->env()->dtrace_method_probes()) { 1198 make_dtrace_method_entry(method()); 1199 } 1200 1201 // If the method is synchronized, we need to construct a lock node, attach 1202 // it to the Start node, and pin it there. 1203 if (method()->is_synchronized()) { 1204 // Insert a FastLockNode right after the Start which takes as arguments 1205 // the current thread pointer, the "this" pointer & the address of the 1206 // stack slot pair used for the lock. The "this" pointer is a projection 1207 // off the start node, but the locking spot has to be constructed by 1208 // creating a ConLNode of 0, and boxing it with a BoxLockNode. The BoxLockNode 1209 // becomes the second argument to the FastLockNode call. The 1210 // FastLockNode becomes the new control parent to pin it to the start. 1211 1212 // Setup Object Pointer 1213 Node *lock_obj = NULL; 1214 if(method()->is_static()) { 1215 ciInstance* mirror = _method->holder()->java_mirror(); 1216 const TypeInstPtr *t_lock = TypeInstPtr::make(mirror); 1217 lock_obj = makecon(t_lock); 1218 } else { // Else pass the "this" pointer, 1219 lock_obj = local(0); // which is Parm0 from StartNode 1220 } 1221 // Clear out dead values from the debug info. 1222 kill_dead_locals(); 1223 // Build the FastLockNode 1224 _synch_lock = shared_lock(lock_obj); 1225 } 1226 1227 // Feed profiling data for parameters to the type system so it can 1228 // propagate it as speculative types 1229 record_profiled_parameters_for_speculation(); 1230 1231 if (depth() == 1) { 1232 increment_and_test_invocation_counter(Tier2CompileThreshold); 1233 } 1234 } 1235 1236 //------------------------------init_blocks------------------------------------ 1237 // Initialize our parser map to contain the types/monitors at method entry. 1238 void Parse::init_blocks() { 1239 // Create the blocks. 1240 _block_count = flow()->block_count(); 1241 _blocks = NEW_RESOURCE_ARRAY(Block, _block_count); 1242 1243 // Initialize the structs. 1244 for (int rpo = 0; rpo < block_count(); rpo++) { 1245 Block* block = rpo_at(rpo); 1246 new(block) Block(this, rpo); 1247 } 1248 1249 // Collect predecessor and successor information. 1250 for (int rpo = 0; rpo < block_count(); rpo++) { 1251 Block* block = rpo_at(rpo); 1252 block->init_graph(this); 1253 } 1254 } 1255 1256 //-------------------------------init_node------------------------------------- 1257 Parse::Block::Block(Parse* outer, int rpo) : _live_locals() { 1258 _flow = outer->flow()->rpo_at(rpo); 1259 _pred_count = 0; 1260 _preds_parsed = 0; 1261 _count = 0; 1262 _is_parsed = false; 1263 _is_handler = false; 1264 _has_merged_backedge = false; 1265 _start_map = NULL; 1266 _has_predicates = false; 1267 _num_successors = 0; 1268 _all_successors = 0; 1269 _successors = NULL; 1270 assert(pred_count() == 0 && preds_parsed() == 0, "sanity"); 1271 assert(!(is_merged() || is_parsed() || is_handler() || has_merged_backedge()), "sanity"); 1272 assert(_live_locals.size() == 0, "sanity"); 1273 1274 // entry point has additional predecessor 1275 if (flow()->is_start()) _pred_count++; 1276 assert(flow()->is_start() == (this == outer->start_block()), ""); 1277 } 1278 1279 //-------------------------------init_graph------------------------------------ 1280 void Parse::Block::init_graph(Parse* outer) { 1281 // Create the successor list for this parser block. 1282 GrowableArray<ciTypeFlow::Block*>* tfs = flow()->successors(); 1283 GrowableArray<ciTypeFlow::Block*>* tfe = flow()->exceptions(); 1284 int ns = tfs->length(); 1285 int ne = tfe->length(); 1286 _num_successors = ns; 1287 _all_successors = ns+ne; 1288 _successors = (ns+ne == 0) ? NULL : NEW_RESOURCE_ARRAY(Block*, ns+ne); 1289 int p = 0; 1290 for (int i = 0; i < ns+ne; i++) { 1291 ciTypeFlow::Block* tf2 = (i < ns) ? tfs->at(i) : tfe->at(i-ns); 1292 Block* block2 = outer->rpo_at(tf2->rpo()); 1293 _successors[i] = block2; 1294 1295 // Accumulate pred info for the other block, too. 1296 if (i < ns) { 1297 block2->_pred_count++; 1298 } else { 1299 block2->_is_handler = true; 1300 } 1301 1302 #ifdef ASSERT 1303 // A block's successors must be distinguishable by BCI. 1304 // That is, no bytecode is allowed to branch to two different 1305 // clones of the same code location. 1306 for (int j = 0; j < i; j++) { 1307 Block* block1 = _successors[j]; 1308 if (block1 == block2) continue; // duplicates are OK 1309 assert(block1->start() != block2->start(), "successors have unique bcis"); 1310 } 1311 #endif 1312 } 1313 1314 // Note: We never call next_path_num along exception paths, so they 1315 // never get processed as "ready". Also, the input phis of exception 1316 // handlers get specially processed, so that 1317 } 1318 1319 //---------------------------successor_for_bci--------------------------------- 1320 Parse::Block* Parse::Block::successor_for_bci(int bci) { 1321 for (int i = 0; i < all_successors(); i++) { 1322 Block* block2 = successor_at(i); 1323 if (block2->start() == bci) return block2; 1324 } 1325 // We can actually reach here if ciTypeFlow traps out a block 1326 // due to an unloaded class, and concurrently with compilation the 1327 // class is then loaded, so that a later phase of the parser is 1328 // able to see more of the bytecode CFG. Or, the flow pass and 1329 // the parser can have a minor difference of opinion about executability 1330 // of bytecodes. For example, "obj.field = null" is executable even 1331 // if the field's type is an unloaded class; the flow pass used to 1332 // make a trap for such code. 1333 return NULL; 1334 } 1335 1336 1337 //-----------------------------stack_type_at----------------------------------- 1338 const Type* Parse::Block::stack_type_at(int i) const { 1339 return get_type(flow()->stack_type_at(i)); 1340 } 1341 1342 1343 //-----------------------------local_type_at----------------------------------- 1344 const Type* Parse::Block::local_type_at(int i) const { 1345 // Make dead locals fall to bottom. 1346 if (_live_locals.size() == 0) { 1347 MethodLivenessResult live_locals = flow()->outer()->method()->liveness_at_bci(start()); 1348 // This bitmap can be zero length if we saw a breakpoint. 1349 // In such cases, pretend they are all live. 1350 ((Block*)this)->_live_locals = live_locals; 1351 } 1352 if (_live_locals.size() > 0 && !_live_locals.at(i)) 1353 return Type::BOTTOM; 1354 1355 return get_type(flow()->local_type_at(i)); 1356 } 1357 1358 1359 #ifndef PRODUCT 1360 1361 //----------------------------name_for_bc-------------------------------------- 1362 // helper method for BytecodeParseHistogram 1363 static const char* name_for_bc(int i) { 1364 return Bytecodes::is_defined(i) ? Bytecodes::name(Bytecodes::cast(i)) : "xxxunusedxxx"; 1365 } 1366 1367 //----------------------------BytecodeParseHistogram------------------------------------ 1368 Parse::BytecodeParseHistogram::BytecodeParseHistogram(Parse *p, Compile *c) { 1369 _parser = p; 1370 _compiler = c; 1371 if( ! _initialized ) { _initialized = true; reset(); } 1372 } 1373 1374 //----------------------------current_count------------------------------------ 1375 int Parse::BytecodeParseHistogram::current_count(BPHType bph_type) { 1376 switch( bph_type ) { 1377 case BPH_transforms: { return _parser->gvn().made_progress(); } 1378 case BPH_values: { return _parser->gvn().made_new_values(); } 1379 default: { ShouldNotReachHere(); return 0; } 1380 } 1381 } 1382 1383 //----------------------------initialized-------------------------------------- 1384 bool Parse::BytecodeParseHistogram::initialized() { return _initialized; } 1385 1386 //----------------------------reset-------------------------------------------- 1387 void Parse::BytecodeParseHistogram::reset() { 1388 int i = Bytecodes::number_of_codes; 1389 while (i-- > 0) { _bytecodes_parsed[i] = 0; _nodes_constructed[i] = 0; _nodes_transformed[i] = 0; _new_values[i] = 0; } 1390 } 1391 1392 //----------------------------set_initial_state-------------------------------- 1393 // Record info when starting to parse one bytecode 1394 void Parse::BytecodeParseHistogram::set_initial_state( Bytecodes::Code bc ) { 1395 if( PrintParseStatistics && !_parser->is_osr_parse() ) { 1396 _initial_bytecode = bc; 1397 _initial_node_count = _compiler->unique(); 1398 _initial_transforms = current_count(BPH_transforms); 1399 _initial_values = current_count(BPH_values); 1400 } 1401 } 1402 1403 //----------------------------record_change-------------------------------- 1404 // Record results of parsing one bytecode 1405 void Parse::BytecodeParseHistogram::record_change() { 1406 if( PrintParseStatistics && !_parser->is_osr_parse() ) { 1407 ++_bytecodes_parsed[_initial_bytecode]; 1408 _nodes_constructed [_initial_bytecode] += (_compiler->unique() - _initial_node_count); 1409 _nodes_transformed [_initial_bytecode] += (current_count(BPH_transforms) - _initial_transforms); 1410 _new_values [_initial_bytecode] += (current_count(BPH_values) - _initial_values); 1411 } 1412 } 1413 1414 1415 //----------------------------print-------------------------------------------- 1416 void Parse::BytecodeParseHistogram::print(float cutoff) { 1417 ResourceMark rm; 1418 // print profile 1419 int total = 0; 1420 int i = 0; 1421 for( i = 0; i < Bytecodes::number_of_codes; ++i ) { total += _bytecodes_parsed[i]; } 1422 int abs_sum = 0; 1423 tty->cr(); //0123456789012345678901234567890123456789012345678901234567890123456789 1424 tty->print_cr("Histogram of %d parsed bytecodes:", total); 1425 if( total == 0 ) { return; } 1426 tty->cr(); 1427 tty->print_cr("absolute: count of compiled bytecodes of this type"); 1428 tty->print_cr("relative: percentage contribution to compiled nodes"); 1429 tty->print_cr("nodes : Average number of nodes constructed per bytecode"); 1430 tty->print_cr("rnodes : Significance towards total nodes constructed, (nodes*relative)"); 1431 tty->print_cr("transforms: Average amount of tranform progress per bytecode compiled"); 1432 tty->print_cr("values : Average number of node values improved per bytecode"); 1433 tty->print_cr("name : Bytecode name"); 1434 tty->cr(); 1435 tty->print_cr(" absolute relative nodes rnodes transforms values name"); 1436 tty->print_cr("----------------------------------------------------------------------"); 1437 while (--i > 0) { 1438 int abs = _bytecodes_parsed[i]; 1439 float rel = abs * 100.0F / total; 1440 float nodes = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_constructed[i])/_bytecodes_parsed[i]; 1441 float rnodes = _bytecodes_parsed[i] == 0 ? 0 : rel * nodes; 1442 float xforms = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_transformed[i])/_bytecodes_parsed[i]; 1443 float values = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _new_values [i])/_bytecodes_parsed[i]; 1444 if (cutoff <= rel) { 1445 tty->print_cr("%10d %7.2f%% %6.1f %6.2f %6.1f %6.1f %s", abs, rel, nodes, rnodes, xforms, values, name_for_bc(i)); 1446 abs_sum += abs; 1447 } 1448 } 1449 tty->print_cr("----------------------------------------------------------------------"); 1450 float rel_sum = abs_sum * 100.0F / total; 1451 tty->print_cr("%10d %7.2f%% (cutoff = %.2f%%)", abs_sum, rel_sum, cutoff); 1452 tty->print_cr("----------------------------------------------------------------------"); 1453 tty->cr(); 1454 } 1455 #endif 1456 1457 //----------------------------load_state_from---------------------------------- 1458 // Load block/map/sp. But not do not touch iter/bci. 1459 void Parse::load_state_from(Block* block) { 1460 set_block(block); 1461 // load the block's JVM state: 1462 set_map(block->start_map()); 1463 set_sp( block->start_sp()); 1464 } 1465 1466 1467 //-----------------------------record_state------------------------------------ 1468 void Parse::Block::record_state(Parse* p) { 1469 assert(!is_merged(), "can only record state once, on 1st inflow"); 1470 assert(start_sp() == p->sp(), "stack pointer must agree with ciTypeFlow"); 1471 set_start_map(p->stop()); 1472 } 1473 1474 1475 //------------------------------do_one_block----------------------------------- 1476 void Parse::do_one_block() { 1477 if (TraceOptoParse) { 1478 Block *b = block(); 1479 int ns = b->num_successors(); 1480 int nt = b->all_successors(); 1481 1482 tty->print("Parsing block #%d at bci [%d,%d), successors: ", 1483 block()->rpo(), block()->start(), block()->limit()); 1484 for (int i = 0; i < nt; i++) { 1485 tty->print((( i < ns) ? " %d" : " %d(e)"), b->successor_at(i)->rpo()); 1486 } 1487 if (b->is_loop_head()) tty->print(" lphd"); 1488 tty->cr(); 1489 } 1490 1491 assert(block()->is_merged(), "must be merged before being parsed"); 1492 block()->mark_parsed(); 1493 1494 // Set iterator to start of block. 1495 iter().reset_to_bci(block()->start()); 1496 1497 CompileLog* log = C->log(); 1498 1499 // Parse bytecodes 1500 while (!stopped() && !failing()) { 1501 iter().next(); 1502 1503 // Learn the current bci from the iterator: 1504 set_parse_bci(iter().cur_bci()); 1505 1506 if (bci() == block()->limit()) { 1507 // Do not walk into the next block until directed by do_all_blocks. 1508 merge(bci()); 1509 break; 1510 } 1511 assert(bci() < block()->limit(), "bci still in block"); 1512 1513 if (log != NULL) { 1514 // Output an optional context marker, to help place actions 1515 // that occur during parsing of this BC. If there is no log 1516 // output until the next context string, this context string 1517 // will be silently ignored. 1518 log->set_context("bc code='%d' bci='%d'", (int)bc(), bci()); 1519 } 1520 1521 if (block()->has_trap_at(bci())) { 1522 // We must respect the flow pass's traps, because it will refuse 1523 // to produce successors for trapping blocks. 1524 int trap_index = block()->flow()->trap_index(); 1525 assert(trap_index != 0, "trap index must be valid"); 1526 uncommon_trap(trap_index); 1527 break; 1528 } 1529 1530 NOT_PRODUCT( parse_histogram()->set_initial_state(bc()); ); 1531 1532 #ifdef ASSERT 1533 int pre_bc_sp = sp(); 1534 int inputs, depth; 1535 bool have_se = !stopped() && compute_stack_effects(inputs, depth); 1536 assert(!have_se || pre_bc_sp >= inputs, "have enough stack to execute this BC: pre_bc_sp=%d, inputs=%d", pre_bc_sp, inputs); 1537 #endif //ASSERT 1538 1539 do_one_bytecode(); 1540 1541 assert(!have_se || stopped() || failing() || (sp() - pre_bc_sp) == depth, 1542 "incorrect depth prediction: sp=%d, pre_bc_sp=%d, depth=%d", sp(), pre_bc_sp, depth); 1543 1544 do_exceptions(); 1545 1546 NOT_PRODUCT( parse_histogram()->record_change(); ); 1547 1548 if (log != NULL) 1549 log->clear_context(); // skip marker if nothing was printed 1550 1551 // Fall into next bytecode. Each bytecode normally has 1 sequential 1552 // successor which is typically made ready by visiting this bytecode. 1553 // If the successor has several predecessors, then it is a merge 1554 // point, starts a new basic block, and is handled like other basic blocks. 1555 } 1556 } 1557 1558 1559 //------------------------------merge------------------------------------------ 1560 void Parse::set_parse_bci(int bci) { 1561 set_bci(bci); 1562 Node_Notes* nn = C->default_node_notes(); 1563 if (nn == NULL) return; 1564 1565 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls. 1566 if (!DebugInlinedCalls && depth() > 1) { 1567 return; 1568 } 1569 1570 // Update the JVMS annotation, if present. 1571 JVMState* jvms = nn->jvms(); 1572 if (jvms != NULL && jvms->bci() != bci) { 1573 // Update the JVMS. 1574 jvms = jvms->clone_shallow(C); 1575 jvms->set_bci(bci); 1576 nn->set_jvms(jvms); 1577 } 1578 } 1579 1580 //------------------------------merge------------------------------------------ 1581 // Merge the current mapping into the basic block starting at bci 1582 void Parse::merge(int target_bci) { 1583 Block* target = successor_for_bci(target_bci); 1584 if (target == NULL) { handle_missing_successor(target_bci); return; } 1585 assert(!target->is_ready(), "our arrival must be expected"); 1586 int pnum = target->next_path_num(); 1587 merge_common(target, pnum); 1588 } 1589 1590 //-------------------------merge_new_path-------------------------------------- 1591 // Merge the current mapping into the basic block, using a new path 1592 void Parse::merge_new_path(int target_bci) { 1593 Block* target = successor_for_bci(target_bci); 1594 if (target == NULL) { handle_missing_successor(target_bci); return; } 1595 assert(!target->is_ready(), "new path into frozen graph"); 1596 int pnum = target->add_new_path(); 1597 merge_common(target, pnum); 1598 } 1599 1600 //-------------------------merge_exception------------------------------------- 1601 // Merge the current mapping into the basic block starting at bci 1602 // The ex_oop must be pushed on the stack, unlike throw_to_exit. 1603 void Parse::merge_exception(int target_bci) { 1604 assert(sp() == 1, "must have only the throw exception on the stack"); 1605 Block* target = successor_for_bci(target_bci); 1606 if (target == NULL) { handle_missing_successor(target_bci); return; } 1607 assert(target->is_handler(), "exceptions are handled by special blocks"); 1608 int pnum = target->add_new_path(); 1609 merge_common(target, pnum); 1610 } 1611 1612 //--------------------handle_missing_successor--------------------------------- 1613 void Parse::handle_missing_successor(int target_bci) { 1614 #ifndef PRODUCT 1615 Block* b = block(); 1616 int trap_bci = b->flow()->has_trap()? b->flow()->trap_bci(): -1; 1617 tty->print_cr("### Missing successor at bci:%d for block #%d (trap_bci:%d)", target_bci, b->rpo(), trap_bci); 1618 #endif 1619 ShouldNotReachHere(); 1620 } 1621 1622 //--------------------------merge_common--------------------------------------- 1623 void Parse::merge_common(Parse::Block* target, int pnum) { 1624 if (TraceOptoParse) { 1625 tty->print("Merging state at block #%d bci:%d", target->rpo(), target->start()); 1626 } 1627 1628 // Zap extra stack slots to top 1629 assert(sp() == target->start_sp(), ""); 1630 clean_stack(sp()); 1631 1632 if (!target->is_merged()) { // No prior mapping at this bci 1633 if (TraceOptoParse) { tty->print(" with empty state"); } 1634 1635 // If this path is dead, do not bother capturing it as a merge. 1636 // It is "as if" we had 1 fewer predecessors from the beginning. 1637 if (stopped()) { 1638 if (TraceOptoParse) tty->print_cr(", but path is dead and doesn't count"); 1639 return; 1640 } 1641 1642 // Make a region if we know there are multiple or unpredictable inputs. 1643 // (Also, if this is a plain fall-through, we might see another region, 1644 // which must not be allowed into this block's map.) 1645 if (pnum > PhiNode::Input // Known multiple inputs. 1646 || target->is_handler() // These have unpredictable inputs. 1647 || target->is_loop_head() // Known multiple inputs 1648 || control()->is_Region()) { // We must hide this guy. 1649 1650 int current_bci = bci(); 1651 set_parse_bci(target->start()); // Set target bci 1652 if (target->is_SEL_head()) { 1653 DEBUG_ONLY( target->mark_merged_backedge(block()); ) 1654 if (target->start() == 0) { 1655 // Add loop predicate for the special case when 1656 // there are backbranches to the method entry. 1657 add_predicate(); 1658 } 1659 } 1660 // Add a Region to start the new basic block. Phis will be added 1661 // later lazily. 1662 int edges = target->pred_count(); 1663 if (edges < pnum) edges = pnum; // might be a new path! 1664 RegionNode *r = new RegionNode(edges+1); 1665 gvn().set_type(r, Type::CONTROL); 1666 record_for_igvn(r); 1667 // zap all inputs to NULL for debugging (done in Node(uint) constructor) 1668 // for (int j = 1; j < edges+1; j++) { r->init_req(j, NULL); } 1669 r->init_req(pnum, control()); 1670 set_control(r); 1671 set_parse_bci(current_bci); // Restore bci 1672 } 1673 1674 // Convert the existing Parser mapping into a mapping at this bci. 1675 store_state_to(target); 1676 assert(target->is_merged(), "do not come here twice"); 1677 1678 } else { // Prior mapping at this bci 1679 if (TraceOptoParse) { tty->print(" with previous state"); } 1680 #ifdef ASSERT 1681 if (target->is_SEL_head()) { 1682 target->mark_merged_backedge(block()); 1683 } 1684 #endif 1685 // We must not manufacture more phis if the target is already parsed. 1686 bool nophi = target->is_parsed(); 1687 1688 SafePointNode* newin = map();// Hang on to incoming mapping 1689 Block* save_block = block(); // Hang on to incoming block; 1690 load_state_from(target); // Get prior mapping 1691 1692 assert(newin->jvms()->locoff() == jvms()->locoff(), "JVMS layouts agree"); 1693 assert(newin->jvms()->stkoff() == jvms()->stkoff(), "JVMS layouts agree"); 1694 assert(newin->jvms()->monoff() == jvms()->monoff(), "JVMS layouts agree"); 1695 assert(newin->jvms()->endoff() == jvms()->endoff(), "JVMS layouts agree"); 1696 1697 // Iterate over my current mapping and the old mapping. 1698 // Where different, insert Phi functions. 1699 // Use any existing Phi functions. 1700 assert(control()->is_Region(), "must be merging to a region"); 1701 RegionNode* r = control()->as_Region(); 1702 1703 // Compute where to merge into 1704 // Merge incoming control path 1705 r->init_req(pnum, newin->control()); 1706 1707 if (pnum == 1) { // Last merge for this Region? 1708 if (!block()->flow()->is_irreducible_entry()) { 1709 Node* result = _gvn.transform_no_reclaim(r); 1710 if (r != result && TraceOptoParse) { 1711 tty->print_cr("Block #%d replace %d with %d", block()->rpo(), r->_idx, result->_idx); 1712 } 1713 } 1714 record_for_igvn(r); 1715 } 1716 1717 // Update all the non-control inputs to map: 1718 assert(TypeFunc::Parms == newin->jvms()->locoff(), "parser map should contain only youngest jvms"); 1719 bool check_elide_phi = target->is_SEL_backedge(save_block); 1720 for (uint j = 1; j < newin->req(); j++) { 1721 Node* m = map()->in(j); // Current state of target. 1722 Node* n = newin->in(j); // Incoming change to target state. 1723 PhiNode* phi; 1724 if (m->is_Phi() && m->as_Phi()->region() == r) 1725 phi = m->as_Phi(); 1726 else 1727 phi = NULL; 1728 if (m != n) { // Different; must merge 1729 switch (j) { 1730 // Frame pointer and Return Address never changes 1731 case TypeFunc::FramePtr:// Drop m, use the original value 1732 case TypeFunc::ReturnAdr: 1733 break; 1734 case TypeFunc::Memory: // Merge inputs to the MergeMem node 1735 assert(phi == NULL, "the merge contains phis, not vice versa"); 1736 merge_memory_edges(n->as_MergeMem(), pnum, nophi); 1737 continue; 1738 default: // All normal stuff 1739 if (phi == NULL) { 1740 const JVMState* jvms = map()->jvms(); 1741 if (EliminateNestedLocks && 1742 jvms->is_mon(j) && jvms->is_monitor_box(j)) { 1743 // BoxLock nodes are not commoning. 1744 // Use old BoxLock node as merged box. 1745 assert(newin->jvms()->is_monitor_box(j), "sanity"); 1746 // This assert also tests that nodes are BoxLock. 1747 assert(BoxLockNode::same_slot(n, m), "sanity"); 1748 C->gvn_replace_by(n, m); 1749 } else if (!check_elide_phi || !target->can_elide_SEL_phi(j)) { 1750 phi = ensure_phi(j, nophi); 1751 } 1752 } 1753 break; 1754 } 1755 } 1756 // At this point, n might be top if: 1757 // - there is no phi (because TypeFlow detected a conflict), or 1758 // - the corresponding control edges is top (a dead incoming path) 1759 // It is a bug if we create a phi which sees a garbage value on a live path. 1760 1761 if (phi != NULL) { 1762 assert(n != top() || r->in(pnum) == top(), "live value must not be garbage"); 1763 assert(phi->region() == r, ""); 1764 phi->set_req(pnum, n); // Then add 'n' to the merge 1765 if (pnum == PhiNode::Input) { 1766 // Last merge for this Phi. 1767 // So far, Phis have had a reasonable type from ciTypeFlow. 1768 // Now _gvn will join that with the meet of current inputs. 1769 // BOTTOM is never permissible here, 'cause pessimistically 1770 // Phis of pointers cannot lose the basic pointer type. 1771 debug_only(const Type* bt1 = phi->bottom_type()); 1772 assert(bt1 != Type::BOTTOM, "should not be building conflict phis"); 1773 map()->set_req(j, _gvn.transform_no_reclaim(phi)); 1774 debug_only(const Type* bt2 = phi->bottom_type()); 1775 assert(bt2->higher_equal_speculative(bt1), "must be consistent with type-flow"); 1776 record_for_igvn(phi); 1777 } 1778 } 1779 } // End of for all values to be merged 1780 1781 if (pnum == PhiNode::Input && 1782 !r->in(0)) { // The occasional useless Region 1783 assert(control() == r, ""); 1784 set_control(r->nonnull_req()); 1785 } 1786 1787 map()->merge_replaced_nodes_with(newin); 1788 1789 // newin has been subsumed into the lazy merge, and is now dead. 1790 set_block(save_block); 1791 1792 stop(); // done with this guy, for now 1793 } 1794 1795 if (TraceOptoParse) { 1796 tty->print_cr(" on path %d", pnum); 1797 } 1798 1799 // Done with this parser state. 1800 assert(stopped(), ""); 1801 } 1802 1803 1804 //--------------------------merge_memory_edges--------------------------------- 1805 void Parse::merge_memory_edges(MergeMemNode* n, int pnum, bool nophi) { 1806 // (nophi means we must not create phis, because we already parsed here) 1807 assert(n != NULL, ""); 1808 // Merge the inputs to the MergeMems 1809 MergeMemNode* m = merged_memory(); 1810 1811 assert(control()->is_Region(), "must be merging to a region"); 1812 RegionNode* r = control()->as_Region(); 1813 1814 PhiNode* base = NULL; 1815 MergeMemNode* remerge = NULL; 1816 for (MergeMemStream mms(m, n); mms.next_non_empty2(); ) { 1817 Node *p = mms.force_memory(); 1818 Node *q = mms.memory2(); 1819 if (mms.is_empty() && nophi) { 1820 // Trouble: No new splits allowed after a loop body is parsed. 1821 // Instead, wire the new split into a MergeMem on the backedge. 1822 // The optimizer will sort it out, slicing the phi. 1823 if (remerge == NULL) { 1824 guarantee(base != NULL, ""); 1825 assert(base->in(0) != NULL, "should not be xformed away"); 1826 remerge = MergeMemNode::make(base->in(pnum)); 1827 gvn().set_type(remerge, Type::MEMORY); 1828 base->set_req(pnum, remerge); 1829 } 1830 remerge->set_memory_at(mms.alias_idx(), q); 1831 continue; 1832 } 1833 assert(!q->is_MergeMem(), ""); 1834 PhiNode* phi; 1835 if (p != q) { 1836 phi = ensure_memory_phi(mms.alias_idx(), nophi); 1837 } else { 1838 if (p->is_Phi() && p->as_Phi()->region() == r) 1839 phi = p->as_Phi(); 1840 else 1841 phi = NULL; 1842 } 1843 // Insert q into local phi 1844 if (phi != NULL) { 1845 assert(phi->region() == r, ""); 1846 p = phi; 1847 phi->set_req(pnum, q); 1848 if (mms.at_base_memory()) { 1849 base = phi; // delay transforming it 1850 } else if (pnum == 1) { 1851 record_for_igvn(phi); 1852 p = _gvn.transform_no_reclaim(phi); 1853 } 1854 mms.set_memory(p);// store back through the iterator 1855 } 1856 } 1857 // Transform base last, in case we must fiddle with remerging. 1858 if (base != NULL && pnum == 1) { 1859 record_for_igvn(base); 1860 m->set_base_memory( _gvn.transform_no_reclaim(base) ); 1861 } 1862 } 1863 1864 1865 //------------------------ensure_phis_everywhere------------------------------- 1866 void Parse::ensure_phis_everywhere() { 1867 ensure_phi(TypeFunc::I_O); 1868 1869 // Ensure a phi on all currently known memories. 1870 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) { 1871 ensure_memory_phi(mms.alias_idx()); 1872 debug_only(mms.set_memory()); // keep the iterator happy 1873 } 1874 1875 // Note: This is our only chance to create phis for memory slices. 1876 // If we miss a slice that crops up later, it will have to be 1877 // merged into the base-memory phi that we are building here. 1878 // Later, the optimizer will comb out the knot, and build separate 1879 // phi-loops for each memory slice that matters. 1880 1881 // Monitors must nest nicely and not get confused amongst themselves. 1882 // Phi-ify everything up to the monitors, though. 1883 uint monoff = map()->jvms()->monoff(); 1884 uint nof_monitors = map()->jvms()->nof_monitors(); 1885 1886 assert(TypeFunc::Parms == map()->jvms()->locoff(), "parser map should contain only youngest jvms"); 1887 bool check_elide_phi = block()->is_SEL_head(); 1888 for (uint i = TypeFunc::Parms; i < monoff; i++) { 1889 if (!check_elide_phi || !block()->can_elide_SEL_phi(i)) { 1890 ensure_phi(i); 1891 } 1892 } 1893 1894 // Even monitors need Phis, though they are well-structured. 1895 // This is true for OSR methods, and also for the rare cases where 1896 // a monitor object is the subject of a replace_in_map operation. 1897 // See bugs 4426707 and 5043395. 1898 for (uint m = 0; m < nof_monitors; m++) { 1899 ensure_phi(map()->jvms()->monitor_obj_offset(m)); 1900 } 1901 } 1902 1903 1904 //-----------------------------add_new_path------------------------------------ 1905 // Add a previously unaccounted predecessor to this block. 1906 int Parse::Block::add_new_path() { 1907 // If there is no map, return the lowest unused path number. 1908 if (!is_merged()) return pred_count()+1; // there will be a map shortly 1909 1910 SafePointNode* map = start_map(); 1911 if (!map->control()->is_Region()) 1912 return pred_count()+1; // there may be a region some day 1913 RegionNode* r = map->control()->as_Region(); 1914 1915 // Add new path to the region. 1916 uint pnum = r->req(); 1917 r->add_req(NULL); 1918 1919 for (uint i = 1; i < map->req(); i++) { 1920 Node* n = map->in(i); 1921 if (i == TypeFunc::Memory) { 1922 // Ensure a phi on all currently known memories. 1923 for (MergeMemStream mms(n->as_MergeMem()); mms.next_non_empty(); ) { 1924 Node* phi = mms.memory(); 1925 if (phi->is_Phi() && phi->as_Phi()->region() == r) { 1926 assert(phi->req() == pnum, "must be same size as region"); 1927 phi->add_req(NULL); 1928 } 1929 } 1930 } else { 1931 if (n->is_Phi() && n->as_Phi()->region() == r) { 1932 assert(n->req() == pnum, "must be same size as region"); 1933 n->add_req(NULL); 1934 } 1935 } 1936 } 1937 1938 return pnum; 1939 } 1940 1941 //------------------------------ensure_phi------------------------------------- 1942 // Turn the idx'th entry of the current map into a Phi 1943 PhiNode *Parse::ensure_phi(int idx, bool nocreate) { 1944 SafePointNode* map = this->map(); 1945 Node* region = map->control(); 1946 assert(region->is_Region(), ""); 1947 1948 Node* o = map->in(idx); 1949 assert(o != NULL, ""); 1950 1951 if (o == top()) return NULL; // TOP always merges into TOP 1952 1953 if (o->is_Phi() && o->as_Phi()->region() == region) { 1954 return o->as_Phi(); 1955 } 1956 1957 // Now use a Phi here for merging 1958 assert(!nocreate, "Cannot build a phi for a block already parsed."); 1959 const JVMState* jvms = map->jvms(); 1960 const Type* t = NULL; 1961 if (jvms->is_loc(idx)) { 1962 t = block()->local_type_at(idx - jvms->locoff()); 1963 } else if (jvms->is_stk(idx)) { 1964 t = block()->stack_type_at(idx - jvms->stkoff()); 1965 } else if (jvms->is_mon(idx)) { 1966 assert(!jvms->is_monitor_box(idx), "no phis for boxes"); 1967 t = TypeInstPtr::BOTTOM; // this is sufficient for a lock object 1968 } else if ((uint)idx < TypeFunc::Parms) { 1969 t = o->bottom_type(); // Type::RETURN_ADDRESS or such-like. 1970 } else { 1971 assert(false, "no type information for this phi"); 1972 } 1973 1974 // If the type falls to bottom, then this must be a local that 1975 // is mixing ints and oops or some such. Forcing it to top 1976 // makes it go dead. 1977 if (t == Type::BOTTOM) { 1978 map->set_req(idx, top()); 1979 return NULL; 1980 } 1981 1982 // Do not create phis for top either. 1983 // A top on a non-null control flow must be an unused even after the.phi. 1984 if (t == Type::TOP || t == Type::HALF) { 1985 map->set_req(idx, top()); 1986 return NULL; 1987 } 1988 1989 PhiNode* phi = PhiNode::make(region, o, t); 1990 gvn().set_type(phi, t); 1991 if (C->do_escape_analysis()) record_for_igvn(phi); 1992 map->set_req(idx, phi); 1993 return phi; 1994 } 1995 1996 //--------------------------ensure_memory_phi---------------------------------- 1997 // Turn the idx'th slice of the current memory into a Phi 1998 PhiNode *Parse::ensure_memory_phi(int idx, bool nocreate) { 1999 MergeMemNode* mem = merged_memory(); 2000 Node* region = control(); 2001 assert(region->is_Region(), ""); 2002 2003 Node *o = (idx == Compile::AliasIdxBot)? mem->base_memory(): mem->memory_at(idx); 2004 assert(o != NULL && o != top(), ""); 2005 2006 PhiNode* phi; 2007 if (o->is_Phi() && o->as_Phi()->region() == region) { 2008 phi = o->as_Phi(); 2009 if (phi == mem->base_memory() && idx >= Compile::AliasIdxRaw) { 2010 // clone the shared base memory phi to make a new memory split 2011 assert(!nocreate, "Cannot build a phi for a block already parsed."); 2012 const Type* t = phi->bottom_type(); 2013 const TypePtr* adr_type = C->get_adr_type(idx); 2014 phi = phi->slice_memory(adr_type); 2015 gvn().set_type(phi, t); 2016 } 2017 return phi; 2018 } 2019 2020 // Now use a Phi here for merging 2021 assert(!nocreate, "Cannot build a phi for a block already parsed."); 2022 const Type* t = o->bottom_type(); 2023 const TypePtr* adr_type = C->get_adr_type(idx); 2024 phi = PhiNode::make(region, o, t, adr_type); 2025 gvn().set_type(phi, t); 2026 if (idx == Compile::AliasIdxBot) 2027 mem->set_base_memory(phi); 2028 else 2029 mem->set_memory_at(idx, phi); 2030 return phi; 2031 } 2032 2033 //------------------------------call_register_finalizer----------------------- 2034 // Check the klass of the receiver and call register_finalizer if the 2035 // class need finalization. 2036 void Parse::call_register_finalizer() { 2037 Node* receiver = local(0); 2038 assert(receiver != NULL && receiver->bottom_type()->isa_instptr() != NULL, 2039 "must have non-null instance type"); 2040 2041 const TypeInstPtr *tinst = receiver->bottom_type()->isa_instptr(); 2042 if (tinst != NULL && tinst->klass()->is_loaded() && !tinst->klass_is_exact()) { 2043 // The type isn't known exactly so see if CHA tells us anything. 2044 ciInstanceKlass* ik = tinst->klass()->as_instance_klass(); 2045 if (!Dependencies::has_finalizable_subclass(ik)) { 2046 // No finalizable subclasses so skip the dynamic check. 2047 C->dependencies()->assert_has_no_finalizable_subclasses(ik); 2048 return; 2049 } 2050 } 2051 2052 // Insert a dynamic test for whether the instance needs 2053 // finalization. In general this will fold up since the concrete 2054 // class is often visible so the access flags are constant. 2055 Node* klass_addr = basic_plus_adr( receiver, receiver, oopDesc::klass_offset_in_bytes() ); 2056 Node* klass = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), klass_addr, TypeInstPtr::KLASS)); 2057 2058 Node* access_flags_addr = basic_plus_adr(klass, klass, in_bytes(Klass::access_flags_offset())); 2059 Node* access_flags = make_load(NULL, access_flags_addr, TypeInt::INT, T_INT, MemNode::unordered); 2060 2061 Node* mask = _gvn.transform(new AndINode(access_flags, intcon(JVM_ACC_HAS_FINALIZER))); 2062 Node* check = _gvn.transform(new CmpINode(mask, intcon(0))); 2063 Node* test = _gvn.transform(new BoolNode(check, BoolTest::ne)); 2064 2065 IfNode* iff = create_and_map_if(control(), test, PROB_MAX, COUNT_UNKNOWN); 2066 2067 RegionNode* result_rgn = new RegionNode(3); 2068 record_for_igvn(result_rgn); 2069 2070 Node *skip_register = _gvn.transform(new IfFalseNode(iff)); 2071 result_rgn->init_req(1, skip_register); 2072 2073 Node *needs_register = _gvn.transform(new IfTrueNode(iff)); 2074 set_control(needs_register); 2075 if (stopped()) { 2076 // There is no slow path. 2077 result_rgn->init_req(2, top()); 2078 } else { 2079 Node *call = make_runtime_call(RC_NO_LEAF, 2080 OptoRuntime::register_finalizer_Type(), 2081 OptoRuntime::register_finalizer_Java(), 2082 NULL, TypePtr::BOTTOM, 2083 receiver); 2084 make_slow_call_ex(call, env()->Throwable_klass(), true); 2085 2086 Node* fast_io = call->in(TypeFunc::I_O); 2087 Node* fast_mem = call->in(TypeFunc::Memory); 2088 // These two phis are pre-filled with copies of of the fast IO and Memory 2089 Node* io_phi = PhiNode::make(result_rgn, fast_io, Type::ABIO); 2090 Node* mem_phi = PhiNode::make(result_rgn, fast_mem, Type::MEMORY, TypePtr::BOTTOM); 2091 2092 result_rgn->init_req(2, control()); 2093 io_phi ->init_req(2, i_o()); 2094 mem_phi ->init_req(2, reset_memory()); 2095 2096 set_all_memory( _gvn.transform(mem_phi) ); 2097 set_i_o( _gvn.transform(io_phi) ); 2098 } 2099 2100 set_control( _gvn.transform(result_rgn) ); 2101 } 2102 2103 // Add check to deoptimize if RTM state is not ProfileRTM 2104 void Parse::rtm_deopt() { 2105 #if INCLUDE_RTM_OPT 2106 if (C->profile_rtm()) { 2107 assert(C->method() != NULL, "only for normal compilations"); 2108 assert(!C->method()->method_data()->is_empty(), "MDO is needed to record RTM state"); 2109 assert(depth() == 1, "generate check only for main compiled method"); 2110 2111 // Set starting bci for uncommon trap. 2112 set_parse_bci(is_osr_parse() ? osr_bci() : 0); 2113 2114 // Load the rtm_state from the MethodData. 2115 const TypePtr* adr_type = TypeMetadataPtr::make(C->method()->method_data()); 2116 Node* mdo = makecon(adr_type); 2117 int offset = MethodData::rtm_state_offset_in_bytes(); 2118 Node* adr_node = basic_plus_adr(mdo, mdo, offset); 2119 Node* rtm_state = make_load(control(), adr_node, TypeInt::INT, T_INT, adr_type, MemNode::unordered); 2120 2121 // Separate Load from Cmp by Opaque. 2122 // In expand_macro_nodes() it will be replaced either 2123 // with this load when there are locks in the code 2124 // or with ProfileRTM (cmp->in(2)) otherwise so that 2125 // the check will fold. 2126 Node* profile_state = makecon(TypeInt::make(ProfileRTM)); 2127 Node* opq = _gvn.transform( new Opaque3Node(C, rtm_state, Opaque3Node::RTM_OPT) ); 2128 Node* chk = _gvn.transform( new CmpINode(opq, profile_state) ); 2129 Node* tst = _gvn.transform( new BoolNode(chk, BoolTest::eq) ); 2130 // Branch to failure if state was changed 2131 { BuildCutout unless(this, tst, PROB_ALWAYS); 2132 uncommon_trap(Deoptimization::Reason_rtm_state_change, 2133 Deoptimization::Action_make_not_entrant); 2134 } 2135 } 2136 #endif 2137 } 2138 2139 void Parse::decrement_age() { 2140 MethodCounters* mc = method()->ensure_method_counters(); 2141 if (mc == NULL) { 2142 C->record_failure("Must have MCs"); 2143 return; 2144 } 2145 assert(!is_osr_parse(), "Not doing this for OSRs"); 2146 2147 // Set starting bci for uncommon trap. 2148 set_parse_bci(0); 2149 2150 const TypePtr* adr_type = TypeRawPtr::make((address)mc); 2151 Node* mc_adr = makecon(adr_type); 2152 Node* cnt_adr = basic_plus_adr(mc_adr, mc_adr, in_bytes(MethodCounters::nmethod_age_offset())); 2153 Node* cnt = make_load(control(), cnt_adr, TypeInt::INT, T_INT, adr_type, MemNode::unordered); 2154 Node* decr = _gvn.transform(new SubINode(cnt, makecon(TypeInt::ONE))); 2155 store_to_memory(control(), cnt_adr, decr, T_INT, adr_type, MemNode::unordered); 2156 Node *chk = _gvn.transform(new CmpINode(decr, makecon(TypeInt::ZERO))); 2157 Node* tst = _gvn.transform(new BoolNode(chk, BoolTest::gt)); 2158 { BuildCutout unless(this, tst, PROB_ALWAYS); 2159 uncommon_trap(Deoptimization::Reason_tenured, 2160 Deoptimization::Action_make_not_entrant); 2161 } 2162 } 2163 2164 //------------------------------return_current--------------------------------- 2165 // Append current _map to _exit_return 2166 void Parse::return_current(Node* value) { 2167 if (RegisterFinalizersAtInit && 2168 method()->intrinsic_id() == vmIntrinsics::_Object_init) { 2169 call_register_finalizer(); 2170 } 2171 2172 // Do not set_parse_bci, so that return goo is credited to the return insn. 2173 set_bci(InvocationEntryBci); 2174 if (method()->is_synchronized() && GenerateSynchronizationCode) { 2175 shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node()); 2176 } 2177 if (C->env()->dtrace_method_probes()) { 2178 make_dtrace_method_exit(method()); 2179 } 2180 SafePointNode* exit_return = _exits.map(); 2181 exit_return->in( TypeFunc::Control )->add_req( control() ); 2182 exit_return->in( TypeFunc::I_O )->add_req( i_o () ); 2183 Node *mem = exit_return->in( TypeFunc::Memory ); 2184 for (MergeMemStream mms(mem->as_MergeMem(), merged_memory()); mms.next_non_empty2(); ) { 2185 if (mms.is_empty()) { 2186 // get a copy of the base memory, and patch just this one input 2187 const TypePtr* adr_type = mms.adr_type(C); 2188 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type); 2189 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), ""); 2190 gvn().set_type_bottom(phi); 2191 phi->del_req(phi->req()-1); // prepare to re-patch 2192 mms.set_memory(phi); 2193 } 2194 mms.memory()->add_req(mms.memory2()); 2195 } 2196 2197 // frame pointer is always same, already captured 2198 if (value != NULL) { 2199 // If returning oops to an interface-return, there is a silent free 2200 // cast from oop to interface allowed by the Verifier. Make it explicit 2201 // here. 2202 Node* phi = _exits.argument(0); 2203 const TypeInstPtr *tr = phi->bottom_type()->isa_instptr(); 2204 if (tr && tr->klass()->is_loaded() && 2205 tr->klass()->is_interface()) { 2206 const TypeInstPtr *tp = value->bottom_type()->isa_instptr(); 2207 if (tp && tp->klass()->is_loaded() && 2208 !tp->klass()->is_interface()) { 2209 // sharpen the type eagerly; this eases certain assert checking 2210 if (tp->higher_equal(TypeInstPtr::NOTNULL)) 2211 tr = tr->join_speculative(TypeInstPtr::NOTNULL)->is_instptr(); 2212 value = _gvn.transform(new CheckCastPPNode(0, value, tr)); 2213 } 2214 } else { 2215 // Also handle returns of oop-arrays to an arrays-of-interface return 2216 const TypeInstPtr* phi_tip; 2217 const TypeInstPtr* val_tip; 2218 Type::get_arrays_base_elements(phi->bottom_type(), value->bottom_type(), &phi_tip, &val_tip); 2219 if (phi_tip != NULL && phi_tip->is_loaded() && phi_tip->klass()->is_interface() && 2220 val_tip != NULL && val_tip->is_loaded() && !val_tip->klass()->is_interface()) { 2221 value = _gvn.transform(new CheckCastPPNode(0, value, phi->bottom_type())); 2222 } 2223 } 2224 phi->add_req(value); 2225 } 2226 2227 if (_first_return) { 2228 _exits.map()->transfer_replaced_nodes_from(map(), _new_idx); 2229 _first_return = false; 2230 } else { 2231 _exits.map()->merge_replaced_nodes_with(map()); 2232 } 2233 2234 stop_and_kill_map(); // This CFG path dies here 2235 } 2236 2237 2238 //------------------------------add_safepoint---------------------------------- 2239 void Parse::add_safepoint() { 2240 // See if we can avoid this safepoint. No need for a SafePoint immediately 2241 // after a Call (except Leaf Call) or another SafePoint. 2242 Node *proj = control(); 2243 bool add_poll_param = SafePointNode::needs_polling_address_input(); 2244 uint parms = add_poll_param ? TypeFunc::Parms+1 : TypeFunc::Parms; 2245 if( proj->is_Proj() ) { 2246 Node *n0 = proj->in(0); 2247 if( n0->is_Catch() ) { 2248 n0 = n0->in(0)->in(0); 2249 assert( n0->is_Call(), "expect a call here" ); 2250 } 2251 if( n0->is_Call() ) { 2252 if( n0->as_Call()->guaranteed_safepoint() ) 2253 return; 2254 } else if( n0->is_SafePoint() && n0->req() >= parms ) { 2255 return; 2256 } 2257 } 2258 2259 // Clear out dead values from the debug info. 2260 kill_dead_locals(); 2261 2262 // Clone the JVM State 2263 SafePointNode *sfpnt = new SafePointNode(parms, NULL); 2264 2265 // Capture memory state BEFORE a SafePoint. Since we can block at a 2266 // SafePoint we need our GC state to be safe; i.e. we need all our current 2267 // write barriers (card marks) to not float down after the SafePoint so we 2268 // must read raw memory. Likewise we need all oop stores to match the card 2269 // marks. If deopt can happen, we need ALL stores (we need the correct JVM 2270 // state on a deopt). 2271 2272 // We do not need to WRITE the memory state after a SafePoint. The control 2273 // edge will keep card-marks and oop-stores from floating up from below a 2274 // SafePoint and our true dependency added here will keep them from floating 2275 // down below a SafePoint. 2276 2277 // Clone the current memory state 2278 Node* mem = MergeMemNode::make(map()->memory()); 2279 2280 mem = _gvn.transform(mem); 2281 2282 // Pass control through the safepoint 2283 sfpnt->init_req(TypeFunc::Control , control()); 2284 // Fix edges normally used by a call 2285 sfpnt->init_req(TypeFunc::I_O , top() ); 2286 sfpnt->init_req(TypeFunc::Memory , mem ); 2287 sfpnt->init_req(TypeFunc::ReturnAdr, top() ); 2288 sfpnt->init_req(TypeFunc::FramePtr , top() ); 2289 2290 // Create a node for the polling address 2291 if( add_poll_param ) { 2292 Node *polladr; 2293 if (SafepointMechanism::uses_thread_local_poll()) { 2294 Node *thread = _gvn.transform(new ThreadLocalNode()); 2295 Node *polling_page_load_addr = _gvn.transform(basic_plus_adr(top(), thread, in_bytes(Thread::polling_page_offset()))); 2296 polladr = make_load(control(), polling_page_load_addr, TypeRawPtr::BOTTOM, T_ADDRESS, Compile::AliasIdxRaw, MemNode::unordered); 2297 } else { 2298 polladr = ConPNode::make((address)os::get_polling_page()); 2299 } 2300 sfpnt->init_req(TypeFunc::Parms+0, _gvn.transform(polladr)); 2301 } 2302 2303 // Fix up the JVM State edges 2304 add_safepoint_edges(sfpnt); 2305 Node *transformed_sfpnt = _gvn.transform(sfpnt); 2306 set_control(transformed_sfpnt); 2307 2308 // Provide an edge from root to safepoint. This makes the safepoint 2309 // appear useful until the parse has completed. 2310 if( OptoRemoveUseless && transformed_sfpnt->is_SafePoint() ) { 2311 assert(C->root() != NULL, "Expect parse is still valid"); 2312 C->root()->add_prec(transformed_sfpnt); 2313 } 2314 } 2315 2316 #ifndef PRODUCT 2317 //------------------------show_parse_info-------------------------------------- 2318 void Parse::show_parse_info() { 2319 InlineTree* ilt = NULL; 2320 if (C->ilt() != NULL) { 2321 JVMState* caller_jvms = is_osr_parse() ? caller()->caller() : caller(); 2322 ilt = InlineTree::find_subtree_from_root(C->ilt(), caller_jvms, method()); 2323 } 2324 if (PrintCompilation && Verbose) { 2325 if (depth() == 1) { 2326 if( ilt->count_inlines() ) { 2327 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(), 2328 ilt->count_inline_bcs()); 2329 tty->cr(); 2330 } 2331 } else { 2332 if (method()->is_synchronized()) tty->print("s"); 2333 if (method()->has_exception_handlers()) tty->print("!"); 2334 // Check this is not the final compiled version 2335 if (C->trap_can_recompile()) { 2336 tty->print("-"); 2337 } else { 2338 tty->print(" "); 2339 } 2340 method()->print_short_name(); 2341 if (is_osr_parse()) { 2342 tty->print(" @ %d", osr_bci()); 2343 } 2344 tty->print(" (%d bytes)",method()->code_size()); 2345 if (ilt->count_inlines()) { 2346 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(), 2347 ilt->count_inline_bcs()); 2348 } 2349 tty->cr(); 2350 } 2351 } 2352 if (PrintOpto && (depth() == 1 || PrintOptoInlining)) { 2353 // Print that we succeeded; suppress this message on the first osr parse. 2354 2355 if (method()->is_synchronized()) tty->print("s"); 2356 if (method()->has_exception_handlers()) tty->print("!"); 2357 // Check this is not the final compiled version 2358 if (C->trap_can_recompile() && depth() == 1) { 2359 tty->print("-"); 2360 } else { 2361 tty->print(" "); 2362 } 2363 if( depth() != 1 ) { tty->print(" "); } // missing compile count 2364 for (int i = 1; i < depth(); ++i) { tty->print(" "); } 2365 method()->print_short_name(); 2366 if (is_osr_parse()) { 2367 tty->print(" @ %d", osr_bci()); 2368 } 2369 if (ilt->caller_bci() != -1) { 2370 tty->print(" @ %d", ilt->caller_bci()); 2371 } 2372 tty->print(" (%d bytes)",method()->code_size()); 2373 if (ilt->count_inlines()) { 2374 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(), 2375 ilt->count_inline_bcs()); 2376 } 2377 tty->cr(); 2378 } 2379 } 2380 2381 2382 //------------------------------dump------------------------------------------- 2383 // Dump information associated with the bytecodes of current _method 2384 void Parse::dump() { 2385 if( method() != NULL ) { 2386 // Iterate over bytecodes 2387 ciBytecodeStream iter(method()); 2388 for( Bytecodes::Code bc = iter.next(); bc != ciBytecodeStream::EOBC() ; bc = iter.next() ) { 2389 dump_bci( iter.cur_bci() ); 2390 tty->cr(); 2391 } 2392 } 2393 } 2394 2395 // Dump information associated with a byte code index, 'bci' 2396 void Parse::dump_bci(int bci) { 2397 // Output info on merge-points, cloning, and within _jsr..._ret 2398 // NYI 2399 tty->print(" bci:%d", bci); 2400 } 2401 2402 #endif