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