1 /* 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 #include "incls/_precompiled.incl" 26 #include "incls/_compile.cpp.incl" 27 28 /// Support for intrinsics. 29 30 // Return the index at which m must be inserted (or already exists). 31 // The sort order is by the address of the ciMethod, with is_virtual as minor key. 32 int Compile::intrinsic_insertion_index(ciMethod* m, bool is_virtual) { 33 #ifdef ASSERT 34 for (int i = 1; i < _intrinsics->length(); i++) { 35 CallGenerator* cg1 = _intrinsics->at(i-1); 36 CallGenerator* cg2 = _intrinsics->at(i); 37 assert(cg1->method() != cg2->method() 38 ? cg1->method() < cg2->method() 39 : cg1->is_virtual() < cg2->is_virtual(), 40 "compiler intrinsics list must stay sorted"); 41 } 42 #endif 43 // Binary search sorted list, in decreasing intervals [lo, hi]. 44 int lo = 0, hi = _intrinsics->length()-1; 45 while (lo <= hi) { 46 int mid = (uint)(hi + lo) / 2; 47 ciMethod* mid_m = _intrinsics->at(mid)->method(); 48 if (m < mid_m) { 49 hi = mid-1; 50 } else if (m > mid_m) { 51 lo = mid+1; 52 } else { 53 // look at minor sort key 54 bool mid_virt = _intrinsics->at(mid)->is_virtual(); 55 if (is_virtual < mid_virt) { 56 hi = mid-1; 57 } else if (is_virtual > mid_virt) { 58 lo = mid+1; 59 } else { 60 return mid; // exact match 61 } 62 } 63 } 64 return lo; // inexact match 65 } 66 67 void Compile::register_intrinsic(CallGenerator* cg) { 68 if (_intrinsics == NULL) { 69 _intrinsics = new GrowableArray<CallGenerator*>(60); 70 } 71 // This code is stolen from ciObjectFactory::insert. 72 // Really, GrowableArray should have methods for 73 // insert_at, remove_at, and binary_search. 74 int len = _intrinsics->length(); 75 int index = intrinsic_insertion_index(cg->method(), cg->is_virtual()); 76 if (index == len) { 77 _intrinsics->append(cg); 78 } else { 79 #ifdef ASSERT 80 CallGenerator* oldcg = _intrinsics->at(index); 81 assert(oldcg->method() != cg->method() || oldcg->is_virtual() != cg->is_virtual(), "don't register twice"); 82 #endif 83 _intrinsics->append(_intrinsics->at(len-1)); 84 int pos; 85 for (pos = len-2; pos >= index; pos--) { 86 _intrinsics->at_put(pos+1,_intrinsics->at(pos)); 87 } 88 _intrinsics->at_put(index, cg); 89 } 90 assert(find_intrinsic(cg->method(), cg->is_virtual()) == cg, "registration worked"); 91 } 92 93 CallGenerator* Compile::find_intrinsic(ciMethod* m, bool is_virtual) { 94 assert(m->is_loaded(), "don't try this on unloaded methods"); 95 if (_intrinsics != NULL) { 96 int index = intrinsic_insertion_index(m, is_virtual); 97 if (index < _intrinsics->length() 98 && _intrinsics->at(index)->method() == m 99 && _intrinsics->at(index)->is_virtual() == is_virtual) { 100 return _intrinsics->at(index); 101 } 102 } 103 // Lazily create intrinsics for intrinsic IDs well-known in the runtime. 104 if (m->intrinsic_id() != vmIntrinsics::_none && 105 m->intrinsic_id() <= vmIntrinsics::LAST_COMPILER_INLINE) { 106 CallGenerator* cg = make_vm_intrinsic(m, is_virtual); 107 if (cg != NULL) { 108 // Save it for next time: 109 register_intrinsic(cg); 110 return cg; 111 } else { 112 gather_intrinsic_statistics(m->intrinsic_id(), is_virtual, _intrinsic_disabled); 113 } 114 } 115 return NULL; 116 } 117 118 // Compile:: register_library_intrinsics and make_vm_intrinsic are defined 119 // in library_call.cpp. 120 121 122 #ifndef PRODUCT 123 // statistics gathering... 124 125 juint Compile::_intrinsic_hist_count[vmIntrinsics::ID_LIMIT] = {0}; 126 jubyte Compile::_intrinsic_hist_flags[vmIntrinsics::ID_LIMIT] = {0}; 127 128 bool Compile::gather_intrinsic_statistics(vmIntrinsics::ID id, bool is_virtual, int flags) { 129 assert(id > vmIntrinsics::_none && id < vmIntrinsics::ID_LIMIT, "oob"); 130 int oflags = _intrinsic_hist_flags[id]; 131 assert(flags != 0, "what happened?"); 132 if (is_virtual) { 133 flags |= _intrinsic_virtual; 134 } 135 bool changed = (flags != oflags); 136 if ((flags & _intrinsic_worked) != 0) { 137 juint count = (_intrinsic_hist_count[id] += 1); 138 if (count == 1) { 139 changed = true; // first time 140 } 141 // increment the overall count also: 142 _intrinsic_hist_count[vmIntrinsics::_none] += 1; 143 } 144 if (changed) { 145 if (((oflags ^ flags) & _intrinsic_virtual) != 0) { 146 // Something changed about the intrinsic's virtuality. 147 if ((flags & _intrinsic_virtual) != 0) { 148 // This is the first use of this intrinsic as a virtual call. 149 if (oflags != 0) { 150 // We already saw it as a non-virtual, so note both cases. 151 flags |= _intrinsic_both; 152 } 153 } else if ((oflags & _intrinsic_both) == 0) { 154 // This is the first use of this intrinsic as a non-virtual 155 flags |= _intrinsic_both; 156 } 157 } 158 _intrinsic_hist_flags[id] = (jubyte) (oflags | flags); 159 } 160 // update the overall flags also: 161 _intrinsic_hist_flags[vmIntrinsics::_none] |= (jubyte) flags; 162 return changed; 163 } 164 165 static char* format_flags(int flags, char* buf) { 166 buf[0] = 0; 167 if ((flags & Compile::_intrinsic_worked) != 0) strcat(buf, ",worked"); 168 if ((flags & Compile::_intrinsic_failed) != 0) strcat(buf, ",failed"); 169 if ((flags & Compile::_intrinsic_disabled) != 0) strcat(buf, ",disabled"); 170 if ((flags & Compile::_intrinsic_virtual) != 0) strcat(buf, ",virtual"); 171 if ((flags & Compile::_intrinsic_both) != 0) strcat(buf, ",nonvirtual"); 172 if (buf[0] == 0) strcat(buf, ","); 173 assert(buf[0] == ',', "must be"); 174 return &buf[1]; 175 } 176 177 void Compile::print_intrinsic_statistics() { 178 char flagsbuf[100]; 179 ttyLocker ttyl; 180 if (xtty != NULL) xtty->head("statistics type='intrinsic'"); 181 tty->print_cr("Compiler intrinsic usage:"); 182 juint total = _intrinsic_hist_count[vmIntrinsics::_none]; 183 if (total == 0) total = 1; // avoid div0 in case of no successes 184 #define PRINT_STAT_LINE(name, c, f) \ 185 tty->print_cr(" %4d (%4.1f%%) %s (%s)", (int)(c), ((c) * 100.0) / total, name, f); 186 for (int index = 1 + (int)vmIntrinsics::_none; index < (int)vmIntrinsics::ID_LIMIT; index++) { 187 vmIntrinsics::ID id = (vmIntrinsics::ID) index; 188 int flags = _intrinsic_hist_flags[id]; 189 juint count = _intrinsic_hist_count[id]; 190 if ((flags | count) != 0) { 191 PRINT_STAT_LINE(vmIntrinsics::name_at(id), count, format_flags(flags, flagsbuf)); 192 } 193 } 194 PRINT_STAT_LINE("total", total, format_flags(_intrinsic_hist_flags[vmIntrinsics::_none], flagsbuf)); 195 if (xtty != NULL) xtty->tail("statistics"); 196 } 197 198 void Compile::print_statistics() { 199 { ttyLocker ttyl; 200 if (xtty != NULL) xtty->head("statistics type='opto'"); 201 Parse::print_statistics(); 202 PhaseCCP::print_statistics(); 203 PhaseRegAlloc::print_statistics(); 204 Scheduling::print_statistics(); 205 PhasePeephole::print_statistics(); 206 PhaseIdealLoop::print_statistics(); 207 if (xtty != NULL) xtty->tail("statistics"); 208 } 209 if (_intrinsic_hist_flags[vmIntrinsics::_none] != 0) { 210 // put this under its own <statistics> element. 211 print_intrinsic_statistics(); 212 } 213 } 214 #endif //PRODUCT 215 216 // Support for bundling info 217 Bundle* Compile::node_bundling(const Node *n) { 218 assert(valid_bundle_info(n), "oob"); 219 return &_node_bundling_base[n->_idx]; 220 } 221 222 bool Compile::valid_bundle_info(const Node *n) { 223 return (_node_bundling_limit > n->_idx); 224 } 225 226 227 void Compile::gvn_replace_by(Node* n, Node* nn) { 228 for (DUIterator_Last imin, i = n->last_outs(imin); i >= imin; ) { 229 Node* use = n->last_out(i); 230 bool is_in_table = initial_gvn()->hash_delete(use); 231 uint uses_found = 0; 232 for (uint j = 0; j < use->len(); j++) { 233 if (use->in(j) == n) { 234 if (j < use->req()) 235 use->set_req(j, nn); 236 else 237 use->set_prec(j, nn); 238 uses_found++; 239 } 240 } 241 if (is_in_table) { 242 // reinsert into table 243 initial_gvn()->hash_find_insert(use); 244 } 245 record_for_igvn(use); 246 i -= uses_found; // we deleted 1 or more copies of this edge 247 } 248 } 249 250 251 252 253 // Identify all nodes that are reachable from below, useful. 254 // Use breadth-first pass that records state in a Unique_Node_List, 255 // recursive traversal is slower. 256 void Compile::identify_useful_nodes(Unique_Node_List &useful) { 257 int estimated_worklist_size = unique(); 258 useful.map( estimated_worklist_size, NULL ); // preallocate space 259 260 // Initialize worklist 261 if (root() != NULL) { useful.push(root()); } 262 // If 'top' is cached, declare it useful to preserve cached node 263 if( cached_top_node() ) { useful.push(cached_top_node()); } 264 265 // Push all useful nodes onto the list, breadthfirst 266 for( uint next = 0; next < useful.size(); ++next ) { 267 assert( next < unique(), "Unique useful nodes < total nodes"); 268 Node *n = useful.at(next); 269 uint max = n->len(); 270 for( uint i = 0; i < max; ++i ) { 271 Node *m = n->in(i); 272 if( m == NULL ) continue; 273 useful.push(m); 274 } 275 } 276 } 277 278 // Disconnect all useless nodes by disconnecting those at the boundary. 279 void Compile::remove_useless_nodes(Unique_Node_List &useful) { 280 uint next = 0; 281 while( next < useful.size() ) { 282 Node *n = useful.at(next++); 283 // Use raw traversal of out edges since this code removes out edges 284 int max = n->outcnt(); 285 for (int j = 0; j < max; ++j ) { 286 Node* child = n->raw_out(j); 287 if( ! useful.member(child) ) { 288 assert( !child->is_top() || child != top(), 289 "If top is cached in Compile object it is in useful list"); 290 // Only need to remove this out-edge to the useless node 291 n->raw_del_out(j); 292 --j; 293 --max; 294 } 295 } 296 if (n->outcnt() == 1 && n->has_special_unique_user()) { 297 record_for_igvn( n->unique_out() ); 298 } 299 } 300 debug_only(verify_graph_edges(true/*check for no_dead_code*/);) 301 } 302 303 //------------------------------frame_size_in_words----------------------------- 304 // frame_slots in units of words 305 int Compile::frame_size_in_words() const { 306 // shift is 0 in LP32 and 1 in LP64 307 const int shift = (LogBytesPerWord - LogBytesPerInt); 308 int words = _frame_slots >> shift; 309 assert( words << shift == _frame_slots, "frame size must be properly aligned in LP64" ); 310 return words; 311 } 312 313 // ============================================================================ 314 //------------------------------CompileWrapper--------------------------------- 315 class CompileWrapper : public StackObj { 316 Compile *const _compile; 317 public: 318 CompileWrapper(Compile* compile); 319 320 ~CompileWrapper(); 321 }; 322 323 CompileWrapper::CompileWrapper(Compile* compile) : _compile(compile) { 324 // the Compile* pointer is stored in the current ciEnv: 325 ciEnv* env = compile->env(); 326 assert(env == ciEnv::current(), "must already be a ciEnv active"); 327 assert(env->compiler_data() == NULL, "compile already active?"); 328 env->set_compiler_data(compile); 329 assert(compile == Compile::current(), "sanity"); 330 331 compile->set_type_dict(NULL); 332 compile->set_type_hwm(NULL); 333 compile->set_type_last_size(0); 334 compile->set_last_tf(NULL, NULL); 335 compile->set_indexSet_arena(NULL); 336 compile->set_indexSet_free_block_list(NULL); 337 compile->init_type_arena(); 338 Type::Initialize(compile); 339 _compile->set_scratch_buffer_blob(NULL); 340 _compile->begin_method(); 341 } 342 CompileWrapper::~CompileWrapper() { 343 _compile->end_method(); 344 if (_compile->scratch_buffer_blob() != NULL) 345 BufferBlob::free(_compile->scratch_buffer_blob()); 346 _compile->env()->set_compiler_data(NULL); 347 } 348 349 350 //----------------------------print_compile_messages--------------------------- 351 void Compile::print_compile_messages() { 352 #ifndef PRODUCT 353 // Check if recompiling 354 if (_subsume_loads == false && PrintOpto) { 355 // Recompiling without allowing machine instructions to subsume loads 356 tty->print_cr("*********************************************************"); 357 tty->print_cr("** Bailout: Recompile without subsuming loads **"); 358 tty->print_cr("*********************************************************"); 359 } 360 if (_do_escape_analysis != DoEscapeAnalysis && PrintOpto) { 361 // Recompiling without escape analysis 362 tty->print_cr("*********************************************************"); 363 tty->print_cr("** Bailout: Recompile without escape analysis **"); 364 tty->print_cr("*********************************************************"); 365 } 366 if (env()->break_at_compile()) { 367 // Open the debugger when compiling this method. 368 tty->print("### Breaking when compiling: "); 369 method()->print_short_name(); 370 tty->cr(); 371 BREAKPOINT; 372 } 373 374 if( PrintOpto ) { 375 if (is_osr_compilation()) { 376 tty->print("[OSR]%3d", _compile_id); 377 } else { 378 tty->print("%3d", _compile_id); 379 } 380 } 381 #endif 382 } 383 384 385 void Compile::init_scratch_buffer_blob() { 386 if( scratch_buffer_blob() != NULL ) return; 387 388 // Construct a temporary CodeBuffer to have it construct a BufferBlob 389 // Cache this BufferBlob for this compile. 390 ResourceMark rm; 391 int size = (MAX_inst_size + MAX_stubs_size + MAX_const_size); 392 BufferBlob* blob = BufferBlob::create("Compile::scratch_buffer", size); 393 // Record the buffer blob for next time. 394 set_scratch_buffer_blob(blob); 395 // Have we run out of code space? 396 if (scratch_buffer_blob() == NULL) { 397 // Let CompilerBroker disable further compilations. 398 record_failure("Not enough space for scratch buffer in CodeCache"); 399 return; 400 } 401 402 // Initialize the relocation buffers 403 relocInfo* locs_buf = (relocInfo*) blob->instructions_end() - MAX_locs_size; 404 set_scratch_locs_memory(locs_buf); 405 } 406 407 408 //-----------------------scratch_emit_size------------------------------------- 409 // Helper function that computes size by emitting code 410 uint Compile::scratch_emit_size(const Node* n) { 411 // Emit into a trash buffer and count bytes emitted. 412 // This is a pretty expensive way to compute a size, 413 // but it works well enough if seldom used. 414 // All common fixed-size instructions are given a size 415 // method by the AD file. 416 // Note that the scratch buffer blob and locs memory are 417 // allocated at the beginning of the compile task, and 418 // may be shared by several calls to scratch_emit_size. 419 // The allocation of the scratch buffer blob is particularly 420 // expensive, since it has to grab the code cache lock. 421 BufferBlob* blob = this->scratch_buffer_blob(); 422 assert(blob != NULL, "Initialize BufferBlob at start"); 423 assert(blob->size() > MAX_inst_size, "sanity"); 424 relocInfo* locs_buf = scratch_locs_memory(); 425 address blob_begin = blob->instructions_begin(); 426 address blob_end = (address)locs_buf; 427 assert(blob->instructions_contains(blob_end), "sanity"); 428 CodeBuffer buf(blob_begin, blob_end - blob_begin); 429 buf.initialize_consts_size(MAX_const_size); 430 buf.initialize_stubs_size(MAX_stubs_size); 431 assert(locs_buf != NULL, "sanity"); 432 int lsize = MAX_locs_size / 2; 433 buf.insts()->initialize_shared_locs(&locs_buf[0], lsize); 434 buf.stubs()->initialize_shared_locs(&locs_buf[lsize], lsize); 435 n->emit(buf, this->regalloc()); 436 return buf.code_size(); 437 } 438 439 440 // ============================================================================ 441 //------------------------------Compile standard------------------------------- 442 debug_only( int Compile::_debug_idx = 100000; ) 443 444 // Compile a method. entry_bci is -1 for normal compilations and indicates 445 // the continuation bci for on stack replacement. 446 447 448 Compile::Compile( ciEnv* ci_env, C2Compiler* compiler, ciMethod* target, int osr_bci, bool subsume_loads, bool do_escape_analysis ) 449 : Phase(Compiler), 450 _env(ci_env), 451 _log(ci_env->log()), 452 _compile_id(ci_env->compile_id()), 453 _save_argument_registers(false), 454 _stub_name(NULL), 455 _stub_function(NULL), 456 _stub_entry_point(NULL), 457 _method(target), 458 _entry_bci(osr_bci), 459 _initial_gvn(NULL), 460 _for_igvn(NULL), 461 _warm_calls(NULL), 462 _subsume_loads(subsume_loads), 463 _do_escape_analysis(do_escape_analysis), 464 _failure_reason(NULL), 465 _code_buffer("Compile::Fill_buffer"), 466 _orig_pc_slot(0), 467 _orig_pc_slot_offset_in_bytes(0), 468 _node_bundling_limit(0), 469 _node_bundling_base(NULL), 470 _java_calls(0), 471 _inner_loops(0), 472 #ifndef PRODUCT 473 _trace_opto_output(TraceOptoOutput || method()->has_option("TraceOptoOutput")), 474 _printer(IdealGraphPrinter::printer()), 475 #endif 476 _congraph(NULL) { 477 C = this; 478 479 CompileWrapper cw(this); 480 #ifndef PRODUCT 481 if (TimeCompiler2) { 482 tty->print(" "); 483 target->holder()->name()->print(); 484 tty->print("."); 485 target->print_short_name(); 486 tty->print(" "); 487 } 488 TraceTime t1("Total compilation time", &_t_totalCompilation, TimeCompiler, TimeCompiler2); 489 TraceTime t2(NULL, &_t_methodCompilation, TimeCompiler, false); 490 bool print_opto_assembly = PrintOptoAssembly || _method->has_option("PrintOptoAssembly"); 491 if (!print_opto_assembly) { 492 bool print_assembly = (PrintAssembly || _method->should_print_assembly()); 493 if (print_assembly && !Disassembler::can_decode()) { 494 tty->print_cr("PrintAssembly request changed to PrintOptoAssembly"); 495 print_opto_assembly = true; 496 } 497 } 498 set_print_assembly(print_opto_assembly); 499 set_parsed_irreducible_loop(false); 500 #endif 501 502 if (ProfileTraps) { 503 // Make sure the method being compiled gets its own MDO, 504 // so we can at least track the decompile_count(). 505 method()->build_method_data(); 506 } 507 508 Init(::AliasLevel); 509 510 511 print_compile_messages(); 512 513 if (UseOldInlining || PrintCompilation NOT_PRODUCT( || PrintOpto) ) 514 _ilt = InlineTree::build_inline_tree_root(); 515 else 516 _ilt = NULL; 517 518 // Even if NO memory addresses are used, MergeMem nodes must have at least 1 slice 519 assert(num_alias_types() >= AliasIdxRaw, ""); 520 521 #define MINIMUM_NODE_HASH 1023 522 // Node list that Iterative GVN will start with 523 Unique_Node_List for_igvn(comp_arena()); 524 set_for_igvn(&for_igvn); 525 526 // GVN that will be run immediately on new nodes 527 uint estimated_size = method()->code_size()*4+64; 528 estimated_size = (estimated_size < MINIMUM_NODE_HASH ? MINIMUM_NODE_HASH : estimated_size); 529 PhaseGVN gvn(node_arena(), estimated_size); 530 set_initial_gvn(&gvn); 531 532 { // Scope for timing the parser 533 TracePhase t3("parse", &_t_parser, true); 534 535 // Put top into the hash table ASAP. 536 initial_gvn()->transform_no_reclaim(top()); 537 538 // Set up tf(), start(), and find a CallGenerator. 539 CallGenerator* cg; 540 if (is_osr_compilation()) { 541 const TypeTuple *domain = StartOSRNode::osr_domain(); 542 const TypeTuple *range = TypeTuple::make_range(method()->signature()); 543 init_tf(TypeFunc::make(domain, range)); 544 StartNode* s = new (this, 2) StartOSRNode(root(), domain); 545 initial_gvn()->set_type_bottom(s); 546 init_start(s); 547 cg = CallGenerator::for_osr(method(), entry_bci()); 548 } else { 549 // Normal case. 550 init_tf(TypeFunc::make(method())); 551 StartNode* s = new (this, 2) StartNode(root(), tf()->domain()); 552 initial_gvn()->set_type_bottom(s); 553 init_start(s); 554 float past_uses = method()->interpreter_invocation_count(); 555 float expected_uses = past_uses; 556 cg = CallGenerator::for_inline(method(), expected_uses); 557 } 558 if (failing()) return; 559 if (cg == NULL) { 560 record_method_not_compilable_all_tiers("cannot parse method"); 561 return; 562 } 563 JVMState* jvms = build_start_state(start(), tf()); 564 if ((jvms = cg->generate(jvms)) == NULL) { 565 record_method_not_compilable("method parse failed"); 566 return; 567 } 568 GraphKit kit(jvms); 569 570 if (!kit.stopped()) { 571 // Accept return values, and transfer control we know not where. 572 // This is done by a special, unique ReturnNode bound to root. 573 return_values(kit.jvms()); 574 } 575 576 if (kit.has_exceptions()) { 577 // Any exceptions that escape from this call must be rethrown 578 // to whatever caller is dynamically above us on the stack. 579 // This is done by a special, unique RethrowNode bound to root. 580 rethrow_exceptions(kit.transfer_exceptions_into_jvms()); 581 } 582 583 if (!failing() && has_stringbuilder()) { 584 { 585 // remove useless nodes to make the usage analysis simpler 586 ResourceMark rm; 587 PhaseRemoveUseless pru(initial_gvn(), &for_igvn); 588 } 589 590 { 591 ResourceMark rm; 592 print_method("Before StringOpts", 3); 593 PhaseStringOpts pso(initial_gvn(), &for_igvn); 594 print_method("After StringOpts", 3); 595 } 596 597 // now inline anything that we skipped the first time around 598 while (_late_inlines.length() > 0) { 599 CallGenerator* cg = _late_inlines.pop(); 600 cg->do_late_inline(); 601 } 602 } 603 assert(_late_inlines.length() == 0, "should have been processed"); 604 605 print_method("Before RemoveUseless", 3); 606 607 // Remove clutter produced by parsing. 608 if (!failing()) { 609 ResourceMark rm; 610 PhaseRemoveUseless pru(initial_gvn(), &for_igvn); 611 } 612 } 613 614 // Note: Large methods are capped off in do_one_bytecode(). 615 if (failing()) return; 616 617 // After parsing, node notes are no longer automagic. 618 // They must be propagated by register_new_node_with_optimizer(), 619 // clone(), or the like. 620 set_default_node_notes(NULL); 621 622 for (;;) { 623 int successes = Inline_Warm(); 624 if (failing()) return; 625 if (successes == 0) break; 626 } 627 628 // Drain the list. 629 Finish_Warm(); 630 #ifndef PRODUCT 631 if (_printer) { 632 _printer->print_inlining(this); 633 } 634 #endif 635 636 if (failing()) return; 637 NOT_PRODUCT( verify_graph_edges(); ) 638 639 // Perform escape analysis 640 if (_do_escape_analysis && ConnectionGraph::has_candidates(this)) { 641 TracePhase t2("escapeAnalysis", &_t_escapeAnalysis, true); 642 // Add ConP#NULL and ConN#NULL nodes before ConnectionGraph construction. 643 PhaseGVN* igvn = initial_gvn(); 644 Node* oop_null = igvn->zerocon(T_OBJECT); 645 Node* noop_null = igvn->zerocon(T_NARROWOOP); 646 647 _congraph = new(comp_arena()) ConnectionGraph(this); 648 bool has_non_escaping_obj = _congraph->compute_escape(); 649 650 #ifndef PRODUCT 651 if (PrintEscapeAnalysis) { 652 _congraph->dump(); 653 } 654 #endif 655 // Cleanup. 656 if (oop_null->outcnt() == 0) 657 igvn->hash_delete(oop_null); 658 if (noop_null->outcnt() == 0) 659 igvn->hash_delete(noop_null); 660 661 if (!has_non_escaping_obj) { 662 _congraph = NULL; 663 } 664 665 if (failing()) return; 666 } 667 // Now optimize 668 Optimize(); 669 if (failing()) return; 670 NOT_PRODUCT( verify_graph_edges(); ) 671 672 #ifndef PRODUCT 673 if (PrintIdeal) { 674 ttyLocker ttyl; // keep the following output all in one block 675 // This output goes directly to the tty, not the compiler log. 676 // To enable tools to match it up with the compilation activity, 677 // be sure to tag this tty output with the compile ID. 678 if (xtty != NULL) { 679 xtty->head("ideal compile_id='%d'%s", compile_id(), 680 is_osr_compilation() ? " compile_kind='osr'" : 681 ""); 682 } 683 root()->dump(9999); 684 if (xtty != NULL) { 685 xtty->tail("ideal"); 686 } 687 } 688 #endif 689 690 // Now that we know the size of all the monitors we can add a fixed slot 691 // for the original deopt pc. 692 693 _orig_pc_slot = fixed_slots(); 694 int next_slot = _orig_pc_slot + (sizeof(address) / VMRegImpl::stack_slot_size); 695 set_fixed_slots(next_slot); 696 697 // Now generate code 698 Code_Gen(); 699 if (failing()) return; 700 701 // Check if we want to skip execution of all compiled code. 702 { 703 #ifndef PRODUCT 704 if (OptoNoExecute) { 705 record_method_not_compilable("+OptoNoExecute"); // Flag as failed 706 return; 707 } 708 TracePhase t2("install_code", &_t_registerMethod, TimeCompiler); 709 #endif 710 711 if (is_osr_compilation()) { 712 _code_offsets.set_value(CodeOffsets::Verified_Entry, 0); 713 _code_offsets.set_value(CodeOffsets::OSR_Entry, _first_block_size); 714 } else { 715 _code_offsets.set_value(CodeOffsets::Verified_Entry, _first_block_size); 716 _code_offsets.set_value(CodeOffsets::OSR_Entry, 0); 717 } 718 719 env()->register_method(_method, _entry_bci, 720 &_code_offsets, 721 _orig_pc_slot_offset_in_bytes, 722 code_buffer(), 723 frame_size_in_words(), _oop_map_set, 724 &_handler_table, &_inc_table, 725 compiler, 726 env()->comp_level(), 727 true, /*has_debug_info*/ 728 has_unsafe_access() 729 ); 730 } 731 } 732 733 //------------------------------Compile---------------------------------------- 734 // Compile a runtime stub 735 Compile::Compile( ciEnv* ci_env, 736 TypeFunc_generator generator, 737 address stub_function, 738 const char *stub_name, 739 int is_fancy_jump, 740 bool pass_tls, 741 bool save_arg_registers, 742 bool return_pc ) 743 : Phase(Compiler), 744 _env(ci_env), 745 _log(ci_env->log()), 746 _compile_id(-1), 747 _save_argument_registers(save_arg_registers), 748 _method(NULL), 749 _stub_name(stub_name), 750 _stub_function(stub_function), 751 _stub_entry_point(NULL), 752 _entry_bci(InvocationEntryBci), 753 _initial_gvn(NULL), 754 _for_igvn(NULL), 755 _warm_calls(NULL), 756 _orig_pc_slot(0), 757 _orig_pc_slot_offset_in_bytes(0), 758 _subsume_loads(true), 759 _do_escape_analysis(false), 760 _failure_reason(NULL), 761 _code_buffer("Compile::Fill_buffer"), 762 _node_bundling_limit(0), 763 _node_bundling_base(NULL), 764 _java_calls(0), 765 _inner_loops(0), 766 #ifndef PRODUCT 767 _trace_opto_output(TraceOptoOutput), 768 _printer(NULL), 769 #endif 770 _congraph(NULL) { 771 C = this; 772 773 #ifndef PRODUCT 774 TraceTime t1(NULL, &_t_totalCompilation, TimeCompiler, false); 775 TraceTime t2(NULL, &_t_stubCompilation, TimeCompiler, false); 776 set_print_assembly(PrintFrameConverterAssembly); 777 set_parsed_irreducible_loop(false); 778 #endif 779 CompileWrapper cw(this); 780 Init(/*AliasLevel=*/ 0); 781 init_tf((*generator)()); 782 783 { 784 // The following is a dummy for the sake of GraphKit::gen_stub 785 Unique_Node_List for_igvn(comp_arena()); 786 set_for_igvn(&for_igvn); // not used, but some GraphKit guys push on this 787 PhaseGVN gvn(Thread::current()->resource_area(),255); 788 set_initial_gvn(&gvn); // not significant, but GraphKit guys use it pervasively 789 gvn.transform_no_reclaim(top()); 790 791 GraphKit kit; 792 kit.gen_stub(stub_function, stub_name, is_fancy_jump, pass_tls, return_pc); 793 } 794 795 NOT_PRODUCT( verify_graph_edges(); ) 796 Code_Gen(); 797 if (failing()) return; 798 799 800 // Entry point will be accessed using compile->stub_entry_point(); 801 if (code_buffer() == NULL) { 802 Matcher::soft_match_failure(); 803 } else { 804 if (PrintAssembly && (WizardMode || Verbose)) 805 tty->print_cr("### Stub::%s", stub_name); 806 807 if (!failing()) { 808 assert(_fixed_slots == 0, "no fixed slots used for runtime stubs"); 809 810 // Make the NMethod 811 // For now we mark the frame as never safe for profile stackwalking 812 RuntimeStub *rs = RuntimeStub::new_runtime_stub(stub_name, 813 code_buffer(), 814 CodeOffsets::frame_never_safe, 815 // _code_offsets.value(CodeOffsets::Frame_Complete), 816 frame_size_in_words(), 817 _oop_map_set, 818 save_arg_registers); 819 assert(rs != NULL && rs->is_runtime_stub(), "sanity check"); 820 821 _stub_entry_point = rs->entry_point(); 822 } 823 } 824 } 825 826 #ifndef PRODUCT 827 void print_opto_verbose_signature( const TypeFunc *j_sig, const char *stub_name ) { 828 if(PrintOpto && Verbose) { 829 tty->print("%s ", stub_name); j_sig->print_flattened(); tty->cr(); 830 } 831 } 832 #endif 833 834 void Compile::print_codes() { 835 } 836 837 //------------------------------Init------------------------------------------- 838 // Prepare for a single compilation 839 void Compile::Init(int aliaslevel) { 840 _unique = 0; 841 _regalloc = NULL; 842 843 _tf = NULL; // filled in later 844 _top = NULL; // cached later 845 _matcher = NULL; // filled in later 846 _cfg = NULL; // filled in later 847 848 set_24_bit_selection_and_mode(Use24BitFP, false); 849 850 _node_note_array = NULL; 851 _default_node_notes = NULL; 852 853 _immutable_memory = NULL; // filled in at first inquiry 854 855 // Globally visible Nodes 856 // First set TOP to NULL to give safe behavior during creation of RootNode 857 set_cached_top_node(NULL); 858 set_root(new (this, 3) RootNode()); 859 // Now that you have a Root to point to, create the real TOP 860 set_cached_top_node( new (this, 1) ConNode(Type::TOP) ); 861 set_recent_alloc(NULL, NULL); 862 863 // Create Debug Information Recorder to record scopes, oopmaps, etc. 864 env()->set_oop_recorder(new OopRecorder(comp_arena())); 865 env()->set_debug_info(new DebugInformationRecorder(env()->oop_recorder())); 866 env()->set_dependencies(new Dependencies(env())); 867 868 _fixed_slots = 0; 869 set_has_split_ifs(false); 870 set_has_loops(has_method() && method()->has_loops()); // first approximation 871 set_has_stringbuilder(false); 872 _deopt_happens = true; // start out assuming the worst 873 _trap_can_recompile = false; // no traps emitted yet 874 _major_progress = true; // start out assuming good things will happen 875 set_has_unsafe_access(false); 876 Copy::zero_to_bytes(_trap_hist, sizeof(_trap_hist)); 877 set_decompile_count(0); 878 879 set_do_freq_based_layout(BlockLayoutByFrequency || method_has_option("BlockLayoutByFrequency")); 880 // Compilation level related initialization 881 if (env()->comp_level() == CompLevel_fast_compile) { 882 set_num_loop_opts(Tier1LoopOptsCount); 883 set_do_inlining(Tier1Inline != 0); 884 set_max_inline_size(Tier1MaxInlineSize); 885 set_freq_inline_size(Tier1FreqInlineSize); 886 set_do_scheduling(false); 887 set_do_count_invocations(Tier1CountInvocations); 888 set_do_method_data_update(Tier1UpdateMethodData); 889 } else { 890 assert(env()->comp_level() == CompLevel_full_optimization, "unknown comp level"); 891 set_num_loop_opts(LoopOptsCount); 892 set_do_inlining(Inline); 893 set_max_inline_size(MaxInlineSize); 894 set_freq_inline_size(FreqInlineSize); 895 set_do_scheduling(OptoScheduling); 896 set_do_count_invocations(false); 897 set_do_method_data_update(false); 898 } 899 900 if (debug_info()->recording_non_safepoints()) { 901 set_node_note_array(new(comp_arena()) GrowableArray<Node_Notes*> 902 (comp_arena(), 8, 0, NULL)); 903 set_default_node_notes(Node_Notes::make(this)); 904 } 905 906 // // -- Initialize types before each compile -- 907 // // Update cached type information 908 // if( _method && _method->constants() ) 909 // Type::update_loaded_types(_method, _method->constants()); 910 911 // Init alias_type map. 912 if (!_do_escape_analysis && aliaslevel == 3) 913 aliaslevel = 2; // No unique types without escape analysis 914 _AliasLevel = aliaslevel; 915 const int grow_ats = 16; 916 _max_alias_types = grow_ats; 917 _alias_types = NEW_ARENA_ARRAY(comp_arena(), AliasType*, grow_ats); 918 AliasType* ats = NEW_ARENA_ARRAY(comp_arena(), AliasType, grow_ats); 919 Copy::zero_to_bytes(ats, sizeof(AliasType)*grow_ats); 920 { 921 for (int i = 0; i < grow_ats; i++) _alias_types[i] = &ats[i]; 922 } 923 // Initialize the first few types. 924 _alias_types[AliasIdxTop]->Init(AliasIdxTop, NULL); 925 _alias_types[AliasIdxBot]->Init(AliasIdxBot, TypePtr::BOTTOM); 926 _alias_types[AliasIdxRaw]->Init(AliasIdxRaw, TypeRawPtr::BOTTOM); 927 _num_alias_types = AliasIdxRaw+1; 928 // Zero out the alias type cache. 929 Copy::zero_to_bytes(_alias_cache, sizeof(_alias_cache)); 930 // A NULL adr_type hits in the cache right away. Preload the right answer. 931 probe_alias_cache(NULL)->_index = AliasIdxTop; 932 933 _intrinsics = NULL; 934 _macro_nodes = new GrowableArray<Node*>(comp_arena(), 8, 0, NULL); 935 register_library_intrinsics(); 936 } 937 938 //---------------------------init_start---------------------------------------- 939 // Install the StartNode on this compile object. 940 void Compile::init_start(StartNode* s) { 941 if (failing()) 942 return; // already failing 943 assert(s == start(), ""); 944 } 945 946 StartNode* Compile::start() const { 947 assert(!failing(), ""); 948 for (DUIterator_Fast imax, i = root()->fast_outs(imax); i < imax; i++) { 949 Node* start = root()->fast_out(i); 950 if( start->is_Start() ) 951 return start->as_Start(); 952 } 953 ShouldNotReachHere(); 954 return NULL; 955 } 956 957 //-------------------------------immutable_memory------------------------------------- 958 // Access immutable memory 959 Node* Compile::immutable_memory() { 960 if (_immutable_memory != NULL) { 961 return _immutable_memory; 962 } 963 StartNode* s = start(); 964 for (DUIterator_Fast imax, i = s->fast_outs(imax); true; i++) { 965 Node *p = s->fast_out(i); 966 if (p != s && p->as_Proj()->_con == TypeFunc::Memory) { 967 _immutable_memory = p; 968 return _immutable_memory; 969 } 970 } 971 ShouldNotReachHere(); 972 return NULL; 973 } 974 975 //----------------------set_cached_top_node------------------------------------ 976 // Install the cached top node, and make sure Node::is_top works correctly. 977 void Compile::set_cached_top_node(Node* tn) { 978 if (tn != NULL) verify_top(tn); 979 Node* old_top = _top; 980 _top = tn; 981 // Calling Node::setup_is_top allows the nodes the chance to adjust 982 // their _out arrays. 983 if (_top != NULL) _top->setup_is_top(); 984 if (old_top != NULL) old_top->setup_is_top(); 985 assert(_top == NULL || top()->is_top(), ""); 986 } 987 988 #ifndef PRODUCT 989 void Compile::verify_top(Node* tn) const { 990 if (tn != NULL) { 991 assert(tn->is_Con(), "top node must be a constant"); 992 assert(((ConNode*)tn)->type() == Type::TOP, "top node must have correct type"); 993 assert(tn->in(0) != NULL, "must have live top node"); 994 } 995 } 996 #endif 997 998 999 ///-------------------Managing Per-Node Debug & Profile Info------------------- 1000 1001 void Compile::grow_node_notes(GrowableArray<Node_Notes*>* arr, int grow_by) { 1002 guarantee(arr != NULL, ""); 1003 int num_blocks = arr->length(); 1004 if (grow_by < num_blocks) grow_by = num_blocks; 1005 int num_notes = grow_by * _node_notes_block_size; 1006 Node_Notes* notes = NEW_ARENA_ARRAY(node_arena(), Node_Notes, num_notes); 1007 Copy::zero_to_bytes(notes, num_notes * sizeof(Node_Notes)); 1008 while (num_notes > 0) { 1009 arr->append(notes); 1010 notes += _node_notes_block_size; 1011 num_notes -= _node_notes_block_size; 1012 } 1013 assert(num_notes == 0, "exact multiple, please"); 1014 } 1015 1016 bool Compile::copy_node_notes_to(Node* dest, Node* source) { 1017 if (source == NULL || dest == NULL) return false; 1018 1019 if (dest->is_Con()) 1020 return false; // Do not push debug info onto constants. 1021 1022 #ifdef ASSERT 1023 // Leave a bread crumb trail pointing to the original node: 1024 if (dest != NULL && dest != source && dest->debug_orig() == NULL) { 1025 dest->set_debug_orig(source); 1026 } 1027 #endif 1028 1029 if (node_note_array() == NULL) 1030 return false; // Not collecting any notes now. 1031 1032 // This is a copy onto a pre-existing node, which may already have notes. 1033 // If both nodes have notes, do not overwrite any pre-existing notes. 1034 Node_Notes* source_notes = node_notes_at(source->_idx); 1035 if (source_notes == NULL || source_notes->is_clear()) return false; 1036 Node_Notes* dest_notes = node_notes_at(dest->_idx); 1037 if (dest_notes == NULL || dest_notes->is_clear()) { 1038 return set_node_notes_at(dest->_idx, source_notes); 1039 } 1040 1041 Node_Notes merged_notes = (*source_notes); 1042 // The order of operations here ensures that dest notes will win... 1043 merged_notes.update_from(dest_notes); 1044 return set_node_notes_at(dest->_idx, &merged_notes); 1045 } 1046 1047 1048 //--------------------------allow_range_check_smearing------------------------- 1049 // Gating condition for coalescing similar range checks. 1050 // Sometimes we try 'speculatively' replacing a series of a range checks by a 1051 // single covering check that is at least as strong as any of them. 1052 // If the optimization succeeds, the simplified (strengthened) range check 1053 // will always succeed. If it fails, we will deopt, and then give up 1054 // on the optimization. 1055 bool Compile::allow_range_check_smearing() const { 1056 // If this method has already thrown a range-check, 1057 // assume it was because we already tried range smearing 1058 // and it failed. 1059 uint already_trapped = trap_count(Deoptimization::Reason_range_check); 1060 return !already_trapped; 1061 } 1062 1063 1064 //------------------------------flatten_alias_type----------------------------- 1065 const TypePtr *Compile::flatten_alias_type( const TypePtr *tj ) const { 1066 int offset = tj->offset(); 1067 TypePtr::PTR ptr = tj->ptr(); 1068 1069 // Known instance (scalarizable allocation) alias only with itself. 1070 bool is_known_inst = tj->isa_oopptr() != NULL && 1071 tj->is_oopptr()->is_known_instance(); 1072 1073 // Process weird unsafe references. 1074 if (offset == Type::OffsetBot && (tj->isa_instptr() /*|| tj->isa_klassptr()*/)) { 1075 assert(InlineUnsafeOps, "indeterminate pointers come only from unsafe ops"); 1076 assert(!is_known_inst, "scalarizable allocation should not have unsafe references"); 1077 tj = TypeOopPtr::BOTTOM; 1078 ptr = tj->ptr(); 1079 offset = tj->offset(); 1080 } 1081 1082 // Array pointers need some flattening 1083 const TypeAryPtr *ta = tj->isa_aryptr(); 1084 if( ta && is_known_inst ) { 1085 if ( offset != Type::OffsetBot && 1086 offset > arrayOopDesc::length_offset_in_bytes() ) { 1087 offset = Type::OffsetBot; // Flatten constant access into array body only 1088 tj = ta = TypeAryPtr::make(ptr, ta->ary(), ta->klass(), true, offset, ta->instance_id()); 1089 } 1090 } else if( ta && _AliasLevel >= 2 ) { 1091 // For arrays indexed by constant indices, we flatten the alias 1092 // space to include all of the array body. Only the header, klass 1093 // and array length can be accessed un-aliased. 1094 if( offset != Type::OffsetBot ) { 1095 if( ta->const_oop() ) { // methodDataOop or methodOop 1096 offset = Type::OffsetBot; // Flatten constant access into array body 1097 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),ta->ary(),ta->klass(),false,offset); 1098 } else if( offset == arrayOopDesc::length_offset_in_bytes() ) { 1099 // range is OK as-is. 1100 tj = ta = TypeAryPtr::RANGE; 1101 } else if( offset == oopDesc::klass_offset_in_bytes() ) { 1102 tj = TypeInstPtr::KLASS; // all klass loads look alike 1103 ta = TypeAryPtr::RANGE; // generic ignored junk 1104 ptr = TypePtr::BotPTR; 1105 } else if( offset == oopDesc::mark_offset_in_bytes() ) { 1106 tj = TypeInstPtr::MARK; 1107 ta = TypeAryPtr::RANGE; // generic ignored junk 1108 ptr = TypePtr::BotPTR; 1109 } else { // Random constant offset into array body 1110 offset = Type::OffsetBot; // Flatten constant access into array body 1111 tj = ta = TypeAryPtr::make(ptr,ta->ary(),ta->klass(),false,offset); 1112 } 1113 } 1114 // Arrays of fixed size alias with arrays of unknown size. 1115 if (ta->size() != TypeInt::POS) { 1116 const TypeAry *tary = TypeAry::make(ta->elem(), TypeInt::POS); 1117 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,ta->klass(),false,offset); 1118 } 1119 // Arrays of known objects become arrays of unknown objects. 1120 if (ta->elem()->isa_narrowoop() && ta->elem() != TypeNarrowOop::BOTTOM) { 1121 const TypeAry *tary = TypeAry::make(TypeNarrowOop::BOTTOM, ta->size()); 1122 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,NULL,false,offset); 1123 } 1124 if (ta->elem()->isa_oopptr() && ta->elem() != TypeInstPtr::BOTTOM) { 1125 const TypeAry *tary = TypeAry::make(TypeInstPtr::BOTTOM, ta->size()); 1126 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,NULL,false,offset); 1127 } 1128 // Arrays of bytes and of booleans both use 'bastore' and 'baload' so 1129 // cannot be distinguished by bytecode alone. 1130 if (ta->elem() == TypeInt::BOOL) { 1131 const TypeAry *tary = TypeAry::make(TypeInt::BYTE, ta->size()); 1132 ciKlass* aklass = ciTypeArrayKlass::make(T_BYTE); 1133 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,aklass,false,offset); 1134 } 1135 // During the 2nd round of IterGVN, NotNull castings are removed. 1136 // Make sure the Bottom and NotNull variants alias the same. 1137 // Also, make sure exact and non-exact variants alias the same. 1138 if( ptr == TypePtr::NotNull || ta->klass_is_exact() ) { 1139 if (ta->const_oop()) { 1140 tj = ta = TypeAryPtr::make(TypePtr::Constant,ta->const_oop(),ta->ary(),ta->klass(),false,offset); 1141 } else { 1142 tj = ta = TypeAryPtr::make(TypePtr::BotPTR,ta->ary(),ta->klass(),false,offset); 1143 } 1144 } 1145 } 1146 1147 // Oop pointers need some flattening 1148 const TypeInstPtr *to = tj->isa_instptr(); 1149 if( to && _AliasLevel >= 2 && to != TypeOopPtr::BOTTOM ) { 1150 if( ptr == TypePtr::Constant ) { 1151 // No constant oop pointers (such as Strings); they alias with 1152 // unknown strings. 1153 assert(!is_known_inst, "not scalarizable allocation"); 1154 tj = to = TypeInstPtr::make(TypePtr::BotPTR,to->klass(),false,0,offset); 1155 } else if( is_known_inst ) { 1156 tj = to; // Keep NotNull and klass_is_exact for instance type 1157 } else if( ptr == TypePtr::NotNull || to->klass_is_exact() ) { 1158 // During the 2nd round of IterGVN, NotNull castings are removed. 1159 // Make sure the Bottom and NotNull variants alias the same. 1160 // Also, make sure exact and non-exact variants alias the same. 1161 tj = to = TypeInstPtr::make(TypePtr::BotPTR,to->klass(),false,0,offset); 1162 } 1163 // Canonicalize the holder of this field 1164 ciInstanceKlass *k = to->klass()->as_instance_klass(); 1165 if (offset >= 0 && offset < instanceOopDesc::base_offset_in_bytes()) { 1166 // First handle header references such as a LoadKlassNode, even if the 1167 // object's klass is unloaded at compile time (4965979). 1168 if (!is_known_inst) { // Do it only for non-instance types 1169 tj = to = TypeInstPtr::make(TypePtr::BotPTR, env()->Object_klass(), false, NULL, offset); 1170 } 1171 } else if (offset < 0 || offset >= k->size_helper() * wordSize) { 1172 to = NULL; 1173 tj = TypeOopPtr::BOTTOM; 1174 offset = tj->offset(); 1175 } else { 1176 ciInstanceKlass *canonical_holder = k->get_canonical_holder(offset); 1177 if (!k->equals(canonical_holder) || tj->offset() != offset) { 1178 if( is_known_inst ) { 1179 tj = to = TypeInstPtr::make(to->ptr(), canonical_holder, true, NULL, offset, to->instance_id()); 1180 } else { 1181 tj = to = TypeInstPtr::make(to->ptr(), canonical_holder, false, NULL, offset); 1182 } 1183 } 1184 } 1185 } 1186 1187 // Klass pointers to object array klasses need some flattening 1188 const TypeKlassPtr *tk = tj->isa_klassptr(); 1189 if( tk ) { 1190 // If we are referencing a field within a Klass, we need 1191 // to assume the worst case of an Object. Both exact and 1192 // inexact types must flatten to the same alias class. 1193 // Since the flattened result for a klass is defined to be 1194 // precisely java.lang.Object, use a constant ptr. 1195 if ( offset == Type::OffsetBot || (offset >= 0 && (size_t)offset < sizeof(Klass)) ) { 1196 1197 tj = tk = TypeKlassPtr::make(TypePtr::Constant, 1198 TypeKlassPtr::OBJECT->klass(), 1199 offset); 1200 } 1201 1202 ciKlass* klass = tk->klass(); 1203 if( klass->is_obj_array_klass() ) { 1204 ciKlass* k = TypeAryPtr::OOPS->klass(); 1205 if( !k || !k->is_loaded() ) // Only fails for some -Xcomp runs 1206 k = TypeInstPtr::BOTTOM->klass(); 1207 tj = tk = TypeKlassPtr::make( TypePtr::NotNull, k, offset ); 1208 } 1209 1210 // Check for precise loads from the primary supertype array and force them 1211 // to the supertype cache alias index. Check for generic array loads from 1212 // the primary supertype array and also force them to the supertype cache 1213 // alias index. Since the same load can reach both, we need to merge 1214 // these 2 disparate memories into the same alias class. Since the 1215 // primary supertype array is read-only, there's no chance of confusion 1216 // where we bypass an array load and an array store. 1217 uint off2 = offset - Klass::primary_supers_offset_in_bytes(); 1218 if( offset == Type::OffsetBot || 1219 off2 < Klass::primary_super_limit()*wordSize ) { 1220 offset = sizeof(oopDesc) +Klass::secondary_super_cache_offset_in_bytes(); 1221 tj = tk = TypeKlassPtr::make( TypePtr::NotNull, tk->klass(), offset ); 1222 } 1223 } 1224 1225 // Flatten all Raw pointers together. 1226 if (tj->base() == Type::RawPtr) 1227 tj = TypeRawPtr::BOTTOM; 1228 1229 if (tj->base() == Type::AnyPtr) 1230 tj = TypePtr::BOTTOM; // An error, which the caller must check for. 1231 1232 // Flatten all to bottom for now 1233 switch( _AliasLevel ) { 1234 case 0: 1235 tj = TypePtr::BOTTOM; 1236 break; 1237 case 1: // Flatten to: oop, static, field or array 1238 switch (tj->base()) { 1239 //case Type::AryPtr: tj = TypeAryPtr::RANGE; break; 1240 case Type::RawPtr: tj = TypeRawPtr::BOTTOM; break; 1241 case Type::AryPtr: // do not distinguish arrays at all 1242 case Type::InstPtr: tj = TypeInstPtr::BOTTOM; break; 1243 case Type::KlassPtr: tj = TypeKlassPtr::OBJECT; break; 1244 case Type::AnyPtr: tj = TypePtr::BOTTOM; break; // caller checks it 1245 default: ShouldNotReachHere(); 1246 } 1247 break; 1248 case 2: // No collapsing at level 2; keep all splits 1249 case 3: // No collapsing at level 3; keep all splits 1250 break; 1251 default: 1252 Unimplemented(); 1253 } 1254 1255 offset = tj->offset(); 1256 assert( offset != Type::OffsetTop, "Offset has fallen from constant" ); 1257 1258 assert( (offset != Type::OffsetBot && tj->base() != Type::AryPtr) || 1259 (offset == Type::OffsetBot && tj->base() == Type::AryPtr) || 1260 (offset == Type::OffsetBot && tj == TypeOopPtr::BOTTOM) || 1261 (offset == Type::OffsetBot && tj == TypePtr::BOTTOM) || 1262 (offset == oopDesc::mark_offset_in_bytes() && tj->base() == Type::AryPtr) || 1263 (offset == oopDesc::klass_offset_in_bytes() && tj->base() == Type::AryPtr) || 1264 (offset == arrayOopDesc::length_offset_in_bytes() && tj->base() == Type::AryPtr) , 1265 "For oops, klasses, raw offset must be constant; for arrays the offset is never known" ); 1266 assert( tj->ptr() != TypePtr::TopPTR && 1267 tj->ptr() != TypePtr::AnyNull && 1268 tj->ptr() != TypePtr::Null, "No imprecise addresses" ); 1269 // assert( tj->ptr() != TypePtr::Constant || 1270 // tj->base() == Type::RawPtr || 1271 // tj->base() == Type::KlassPtr, "No constant oop addresses" ); 1272 1273 return tj; 1274 } 1275 1276 void Compile::AliasType::Init(int i, const TypePtr* at) { 1277 _index = i; 1278 _adr_type = at; 1279 _field = NULL; 1280 _is_rewritable = true; // default 1281 const TypeOopPtr *atoop = (at != NULL) ? at->isa_oopptr() : NULL; 1282 if (atoop != NULL && atoop->is_known_instance()) { 1283 const TypeOopPtr *gt = atoop->cast_to_instance_id(TypeOopPtr::InstanceBot); 1284 _general_index = Compile::current()->get_alias_index(gt); 1285 } else { 1286 _general_index = 0; 1287 } 1288 } 1289 1290 //---------------------------------print_on------------------------------------ 1291 #ifndef PRODUCT 1292 void Compile::AliasType::print_on(outputStream* st) { 1293 if (index() < 10) 1294 st->print("@ <%d> ", index()); 1295 else st->print("@ <%d>", index()); 1296 st->print(is_rewritable() ? " " : " RO"); 1297 int offset = adr_type()->offset(); 1298 if (offset == Type::OffsetBot) 1299 st->print(" +any"); 1300 else st->print(" +%-3d", offset); 1301 st->print(" in "); 1302 adr_type()->dump_on(st); 1303 const TypeOopPtr* tjp = adr_type()->isa_oopptr(); 1304 if (field() != NULL && tjp) { 1305 if (tjp->klass() != field()->holder() || 1306 tjp->offset() != field()->offset_in_bytes()) { 1307 st->print(" != "); 1308 field()->print(); 1309 st->print(" ***"); 1310 } 1311 } 1312 } 1313 1314 void print_alias_types() { 1315 Compile* C = Compile::current(); 1316 tty->print_cr("--- Alias types, AliasIdxBot .. %d", C->num_alias_types()-1); 1317 for (int idx = Compile::AliasIdxBot; idx < C->num_alias_types(); idx++) { 1318 C->alias_type(idx)->print_on(tty); 1319 tty->cr(); 1320 } 1321 } 1322 #endif 1323 1324 1325 //----------------------------probe_alias_cache-------------------------------- 1326 Compile::AliasCacheEntry* Compile::probe_alias_cache(const TypePtr* adr_type) { 1327 intptr_t key = (intptr_t) adr_type; 1328 key ^= key >> logAliasCacheSize; 1329 return &_alias_cache[key & right_n_bits(logAliasCacheSize)]; 1330 } 1331 1332 1333 //-----------------------------grow_alias_types-------------------------------- 1334 void Compile::grow_alias_types() { 1335 const int old_ats = _max_alias_types; // how many before? 1336 const int new_ats = old_ats; // how many more? 1337 const int grow_ats = old_ats+new_ats; // how many now? 1338 _max_alias_types = grow_ats; 1339 _alias_types = REALLOC_ARENA_ARRAY(comp_arena(), AliasType*, _alias_types, old_ats, grow_ats); 1340 AliasType* ats = NEW_ARENA_ARRAY(comp_arena(), AliasType, new_ats); 1341 Copy::zero_to_bytes(ats, sizeof(AliasType)*new_ats); 1342 for (int i = 0; i < new_ats; i++) _alias_types[old_ats+i] = &ats[i]; 1343 } 1344 1345 1346 //--------------------------------find_alias_type------------------------------ 1347 Compile::AliasType* Compile::find_alias_type(const TypePtr* adr_type, bool no_create) { 1348 if (_AliasLevel == 0) 1349 return alias_type(AliasIdxBot); 1350 1351 AliasCacheEntry* ace = probe_alias_cache(adr_type); 1352 if (ace->_adr_type == adr_type) { 1353 return alias_type(ace->_index); 1354 } 1355 1356 // Handle special cases. 1357 if (adr_type == NULL) return alias_type(AliasIdxTop); 1358 if (adr_type == TypePtr::BOTTOM) return alias_type(AliasIdxBot); 1359 1360 // Do it the slow way. 1361 const TypePtr* flat = flatten_alias_type(adr_type); 1362 1363 #ifdef ASSERT 1364 assert(flat == flatten_alias_type(flat), "idempotent"); 1365 assert(flat != TypePtr::BOTTOM, "cannot alias-analyze an untyped ptr"); 1366 if (flat->isa_oopptr() && !flat->isa_klassptr()) { 1367 const TypeOopPtr* foop = flat->is_oopptr(); 1368 // Scalarizable allocations have exact klass always. 1369 bool exact = !foop->klass_is_exact() || foop->is_known_instance(); 1370 const TypePtr* xoop = foop->cast_to_exactness(exact)->is_ptr(); 1371 assert(foop == flatten_alias_type(xoop), "exactness must not affect alias type"); 1372 } 1373 assert(flat == flatten_alias_type(flat), "exact bit doesn't matter"); 1374 #endif 1375 1376 int idx = AliasIdxTop; 1377 for (int i = 0; i < num_alias_types(); i++) { 1378 if (alias_type(i)->adr_type() == flat) { 1379 idx = i; 1380 break; 1381 } 1382 } 1383 1384 if (idx == AliasIdxTop) { 1385 if (no_create) return NULL; 1386 // Grow the array if necessary. 1387 if (_num_alias_types == _max_alias_types) grow_alias_types(); 1388 // Add a new alias type. 1389 idx = _num_alias_types++; 1390 _alias_types[idx]->Init(idx, flat); 1391 if (flat == TypeInstPtr::KLASS) alias_type(idx)->set_rewritable(false); 1392 if (flat == TypeAryPtr::RANGE) alias_type(idx)->set_rewritable(false); 1393 if (flat->isa_instptr()) { 1394 if (flat->offset() == java_lang_Class::klass_offset_in_bytes() 1395 && flat->is_instptr()->klass() == env()->Class_klass()) 1396 alias_type(idx)->set_rewritable(false); 1397 } 1398 if (flat->isa_klassptr()) { 1399 if (flat->offset() == Klass::super_check_offset_offset_in_bytes() + (int)sizeof(oopDesc)) 1400 alias_type(idx)->set_rewritable(false); 1401 if (flat->offset() == Klass::modifier_flags_offset_in_bytes() + (int)sizeof(oopDesc)) 1402 alias_type(idx)->set_rewritable(false); 1403 if (flat->offset() == Klass::access_flags_offset_in_bytes() + (int)sizeof(oopDesc)) 1404 alias_type(idx)->set_rewritable(false); 1405 if (flat->offset() == Klass::java_mirror_offset_in_bytes() + (int)sizeof(oopDesc)) 1406 alias_type(idx)->set_rewritable(false); 1407 } 1408 // %%% (We would like to finalize JavaThread::threadObj_offset(), 1409 // but the base pointer type is not distinctive enough to identify 1410 // references into JavaThread.) 1411 1412 // Check for final instance fields. 1413 const TypeInstPtr* tinst = flat->isa_instptr(); 1414 if (tinst && tinst->offset() >= instanceOopDesc::base_offset_in_bytes()) { 1415 ciInstanceKlass *k = tinst->klass()->as_instance_klass(); 1416 ciField* field = k->get_field_by_offset(tinst->offset(), false); 1417 // Set field() and is_rewritable() attributes. 1418 if (field != NULL) alias_type(idx)->set_field(field); 1419 } 1420 const TypeKlassPtr* tklass = flat->isa_klassptr(); 1421 // Check for final static fields. 1422 if (tklass && tklass->klass()->is_instance_klass()) { 1423 ciInstanceKlass *k = tklass->klass()->as_instance_klass(); 1424 ciField* field = k->get_field_by_offset(tklass->offset(), true); 1425 // Set field() and is_rewritable() attributes. 1426 if (field != NULL) alias_type(idx)->set_field(field); 1427 } 1428 } 1429 1430 // Fill the cache for next time. 1431 ace->_adr_type = adr_type; 1432 ace->_index = idx; 1433 assert(alias_type(adr_type) == alias_type(idx), "type must be installed"); 1434 1435 // Might as well try to fill the cache for the flattened version, too. 1436 AliasCacheEntry* face = probe_alias_cache(flat); 1437 if (face->_adr_type == NULL) { 1438 face->_adr_type = flat; 1439 face->_index = idx; 1440 assert(alias_type(flat) == alias_type(idx), "flat type must work too"); 1441 } 1442 1443 return alias_type(idx); 1444 } 1445 1446 1447 Compile::AliasType* Compile::alias_type(ciField* field) { 1448 const TypeOopPtr* t; 1449 if (field->is_static()) 1450 t = TypeKlassPtr::make(field->holder()); 1451 else 1452 t = TypeOopPtr::make_from_klass_raw(field->holder()); 1453 AliasType* atp = alias_type(t->add_offset(field->offset_in_bytes())); 1454 assert(field->is_final() == !atp->is_rewritable(), "must get the rewritable bits correct"); 1455 return atp; 1456 } 1457 1458 1459 //------------------------------have_alias_type-------------------------------- 1460 bool Compile::have_alias_type(const TypePtr* adr_type) { 1461 AliasCacheEntry* ace = probe_alias_cache(adr_type); 1462 if (ace->_adr_type == adr_type) { 1463 return true; 1464 } 1465 1466 // Handle special cases. 1467 if (adr_type == NULL) return true; 1468 if (adr_type == TypePtr::BOTTOM) return true; 1469 1470 return find_alias_type(adr_type, true) != NULL; 1471 } 1472 1473 //-----------------------------must_alias-------------------------------------- 1474 // True if all values of the given address type are in the given alias category. 1475 bool Compile::must_alias(const TypePtr* adr_type, int alias_idx) { 1476 if (alias_idx == AliasIdxBot) return true; // the universal category 1477 if (adr_type == NULL) return true; // NULL serves as TypePtr::TOP 1478 if (alias_idx == AliasIdxTop) return false; // the empty category 1479 if (adr_type->base() == Type::AnyPtr) return false; // TypePtr::BOTTOM or its twins 1480 1481 // the only remaining possible overlap is identity 1482 int adr_idx = get_alias_index(adr_type); 1483 assert(adr_idx != AliasIdxBot && adr_idx != AliasIdxTop, ""); 1484 assert(adr_idx == alias_idx || 1485 (alias_type(alias_idx)->adr_type() != TypeOopPtr::BOTTOM 1486 && adr_type != TypeOopPtr::BOTTOM), 1487 "should not be testing for overlap with an unsafe pointer"); 1488 return adr_idx == alias_idx; 1489 } 1490 1491 //------------------------------can_alias-------------------------------------- 1492 // True if any values of the given address type are in the given alias category. 1493 bool Compile::can_alias(const TypePtr* adr_type, int alias_idx) { 1494 if (alias_idx == AliasIdxTop) return false; // the empty category 1495 if (adr_type == NULL) return false; // NULL serves as TypePtr::TOP 1496 if (alias_idx == AliasIdxBot) return true; // the universal category 1497 if (adr_type->base() == Type::AnyPtr) return true; // TypePtr::BOTTOM or its twins 1498 1499 // the only remaining possible overlap is identity 1500 int adr_idx = get_alias_index(adr_type); 1501 assert(adr_idx != AliasIdxBot && adr_idx != AliasIdxTop, ""); 1502 return adr_idx == alias_idx; 1503 } 1504 1505 1506 1507 //---------------------------pop_warm_call------------------------------------- 1508 WarmCallInfo* Compile::pop_warm_call() { 1509 WarmCallInfo* wci = _warm_calls; 1510 if (wci != NULL) _warm_calls = wci->remove_from(wci); 1511 return wci; 1512 } 1513 1514 //----------------------------Inline_Warm-------------------------------------- 1515 int Compile::Inline_Warm() { 1516 // If there is room, try to inline some more warm call sites. 1517 // %%% Do a graph index compaction pass when we think we're out of space? 1518 if (!InlineWarmCalls) return 0; 1519 1520 int calls_made_hot = 0; 1521 int room_to_grow = NodeCountInliningCutoff - unique(); 1522 int amount_to_grow = MIN2(room_to_grow, (int)NodeCountInliningStep); 1523 int amount_grown = 0; 1524 WarmCallInfo* call; 1525 while (amount_to_grow > 0 && (call = pop_warm_call()) != NULL) { 1526 int est_size = (int)call->size(); 1527 if (est_size > (room_to_grow - amount_grown)) { 1528 // This one won't fit anyway. Get rid of it. 1529 call->make_cold(); 1530 continue; 1531 } 1532 call->make_hot(); 1533 calls_made_hot++; 1534 amount_grown += est_size; 1535 amount_to_grow -= est_size; 1536 } 1537 1538 if (calls_made_hot > 0) set_major_progress(); 1539 return calls_made_hot; 1540 } 1541 1542 1543 //----------------------------Finish_Warm-------------------------------------- 1544 void Compile::Finish_Warm() { 1545 if (!InlineWarmCalls) return; 1546 if (failing()) return; 1547 if (warm_calls() == NULL) return; 1548 1549 // Clean up loose ends, if we are out of space for inlining. 1550 WarmCallInfo* call; 1551 while ((call = pop_warm_call()) != NULL) { 1552 call->make_cold(); 1553 } 1554 } 1555 1556 1557 //------------------------------Optimize--------------------------------------- 1558 // Given a graph, optimize it. 1559 void Compile::Optimize() { 1560 TracePhase t1("optimizer", &_t_optimizer, true); 1561 1562 #ifndef PRODUCT 1563 if (env()->break_at_compile()) { 1564 BREAKPOINT; 1565 } 1566 1567 #endif 1568 1569 ResourceMark rm; 1570 int loop_opts_cnt; 1571 1572 NOT_PRODUCT( verify_graph_edges(); ) 1573 1574 print_method("After Parsing"); 1575 1576 { 1577 // Iterative Global Value Numbering, including ideal transforms 1578 // Initialize IterGVN with types and values from parse-time GVN 1579 PhaseIterGVN igvn(initial_gvn()); 1580 { 1581 NOT_PRODUCT( TracePhase t2("iterGVN", &_t_iterGVN, TimeCompiler); ) 1582 igvn.optimize(); 1583 } 1584 1585 print_method("Iter GVN 1", 2); 1586 1587 if (failing()) return; 1588 1589 // Loop transforms on the ideal graph. Range Check Elimination, 1590 // peeling, unrolling, etc. 1591 1592 // Set loop opts counter 1593 loop_opts_cnt = num_loop_opts(); 1594 if((loop_opts_cnt > 0) && (has_loops() || has_split_ifs())) { 1595 { 1596 TracePhase t2("idealLoop", &_t_idealLoop, true); 1597 PhaseIdealLoop ideal_loop( igvn, true ); 1598 loop_opts_cnt--; 1599 if (major_progress()) print_method("PhaseIdealLoop 1", 2); 1600 if (failing()) return; 1601 } 1602 // Loop opts pass if partial peeling occurred in previous pass 1603 if(PartialPeelLoop && major_progress() && (loop_opts_cnt > 0)) { 1604 TracePhase t3("idealLoop", &_t_idealLoop, true); 1605 PhaseIdealLoop ideal_loop( igvn, false ); 1606 loop_opts_cnt--; 1607 if (major_progress()) print_method("PhaseIdealLoop 2", 2); 1608 if (failing()) return; 1609 } 1610 // Loop opts pass for loop-unrolling before CCP 1611 if(major_progress() && (loop_opts_cnt > 0)) { 1612 TracePhase t4("idealLoop", &_t_idealLoop, true); 1613 PhaseIdealLoop ideal_loop( igvn, false ); 1614 loop_opts_cnt--; 1615 if (major_progress()) print_method("PhaseIdealLoop 3", 2); 1616 } 1617 if (!failing()) { 1618 // Verify that last round of loop opts produced a valid graph 1619 NOT_PRODUCT( TracePhase t2("idealLoopVerify", &_t_idealLoopVerify, TimeCompiler); ) 1620 PhaseIdealLoop::verify(igvn); 1621 } 1622 } 1623 if (failing()) return; 1624 1625 // Conditional Constant Propagation; 1626 PhaseCCP ccp( &igvn ); 1627 assert( true, "Break here to ccp.dump_nodes_and_types(_root,999,1)"); 1628 { 1629 TracePhase t2("ccp", &_t_ccp, true); 1630 ccp.do_transform(); 1631 } 1632 print_method("PhaseCPP 1", 2); 1633 1634 assert( true, "Break here to ccp.dump_old2new_map()"); 1635 1636 // Iterative Global Value Numbering, including ideal transforms 1637 { 1638 NOT_PRODUCT( TracePhase t2("iterGVN2", &_t_iterGVN2, TimeCompiler); ) 1639 igvn = ccp; 1640 igvn.optimize(); 1641 } 1642 1643 print_method("Iter GVN 2", 2); 1644 1645 if (failing()) return; 1646 1647 // Loop transforms on the ideal graph. Range Check Elimination, 1648 // peeling, unrolling, etc. 1649 if(loop_opts_cnt > 0) { 1650 debug_only( int cnt = 0; ); 1651 while(major_progress() && (loop_opts_cnt > 0)) { 1652 TracePhase t2("idealLoop", &_t_idealLoop, true); 1653 assert( cnt++ < 40, "infinite cycle in loop optimization" ); 1654 PhaseIdealLoop ideal_loop( igvn, true ); 1655 loop_opts_cnt--; 1656 if (major_progress()) print_method("PhaseIdealLoop iterations", 2); 1657 if (failing()) return; 1658 } 1659 } 1660 1661 { 1662 // Verify that all previous optimizations produced a valid graph 1663 // at least to this point, even if no loop optimizations were done. 1664 NOT_PRODUCT( TracePhase t2("idealLoopVerify", &_t_idealLoopVerify, TimeCompiler); ) 1665 PhaseIdealLoop::verify(igvn); 1666 } 1667 1668 { 1669 NOT_PRODUCT( TracePhase t2("macroExpand", &_t_macroExpand, TimeCompiler); ) 1670 PhaseMacroExpand mex(igvn); 1671 if (mex.expand_macro_nodes()) { 1672 assert(failing(), "must bail out w/ explicit message"); 1673 return; 1674 } 1675 } 1676 1677 } // (End scope of igvn; run destructor if necessary for asserts.) 1678 1679 // A method with only infinite loops has no edges entering loops from root 1680 { 1681 NOT_PRODUCT( TracePhase t2("graphReshape", &_t_graphReshaping, TimeCompiler); ) 1682 if (final_graph_reshaping()) { 1683 assert(failing(), "must bail out w/ explicit message"); 1684 return; 1685 } 1686 } 1687 1688 print_method("Optimize finished", 2); 1689 } 1690 1691 1692 //------------------------------Code_Gen--------------------------------------- 1693 // Given a graph, generate code for it 1694 void Compile::Code_Gen() { 1695 if (failing()) return; 1696 1697 // Perform instruction selection. You might think we could reclaim Matcher 1698 // memory PDQ, but actually the Matcher is used in generating spill code. 1699 // Internals of the Matcher (including some VectorSets) must remain live 1700 // for awhile - thus I cannot reclaim Matcher memory lest a VectorSet usage 1701 // set a bit in reclaimed memory. 1702 1703 // In debug mode can dump m._nodes.dump() for mapping of ideal to machine 1704 // nodes. Mapping is only valid at the root of each matched subtree. 1705 NOT_PRODUCT( verify_graph_edges(); ) 1706 1707 Node_List proj_list; 1708 Matcher m(proj_list); 1709 _matcher = &m; 1710 { 1711 TracePhase t2("matcher", &_t_matcher, true); 1712 m.match(); 1713 } 1714 // In debug mode can dump m._nodes.dump() for mapping of ideal to machine 1715 // nodes. Mapping is only valid at the root of each matched subtree. 1716 NOT_PRODUCT( verify_graph_edges(); ) 1717 1718 // If you have too many nodes, or if matching has failed, bail out 1719 check_node_count(0, "out of nodes matching instructions"); 1720 if (failing()) return; 1721 1722 // Build a proper-looking CFG 1723 PhaseCFG cfg(node_arena(), root(), m); 1724 _cfg = &cfg; 1725 { 1726 NOT_PRODUCT( TracePhase t2("scheduler", &_t_scheduler, TimeCompiler); ) 1727 cfg.Dominators(); 1728 if (failing()) return; 1729 1730 NOT_PRODUCT( verify_graph_edges(); ) 1731 1732 cfg.Estimate_Block_Frequency(); 1733 cfg.GlobalCodeMotion(m,unique(),proj_list); 1734 1735 print_method("Global code motion", 2); 1736 1737 if (failing()) return; 1738 NOT_PRODUCT( verify_graph_edges(); ) 1739 1740 debug_only( cfg.verify(); ) 1741 } 1742 NOT_PRODUCT( verify_graph_edges(); ) 1743 1744 PhaseChaitin regalloc(unique(),cfg,m); 1745 _regalloc = ®alloc; 1746 { 1747 TracePhase t2("regalloc", &_t_registerAllocation, true); 1748 // Perform any platform dependent preallocation actions. This is used, 1749 // for example, to avoid taking an implicit null pointer exception 1750 // using the frame pointer on win95. 1751 _regalloc->pd_preallocate_hook(); 1752 1753 // Perform register allocation. After Chaitin, use-def chains are 1754 // no longer accurate (at spill code) and so must be ignored. 1755 // Node->LRG->reg mappings are still accurate. 1756 _regalloc->Register_Allocate(); 1757 1758 // Bail out if the allocator builds too many nodes 1759 if (failing()) return; 1760 } 1761 1762 // Prior to register allocation we kept empty basic blocks in case the 1763 // the allocator needed a place to spill. After register allocation we 1764 // are not adding any new instructions. If any basic block is empty, we 1765 // can now safely remove it. 1766 { 1767 NOT_PRODUCT( TracePhase t2("blockOrdering", &_t_blockOrdering, TimeCompiler); ) 1768 cfg.remove_empty(); 1769 if (do_freq_based_layout()) { 1770 PhaseBlockLayout layout(cfg); 1771 } else { 1772 cfg.set_loop_alignment(); 1773 } 1774 cfg.fixup_flow(); 1775 } 1776 1777 // Perform any platform dependent postallocation verifications. 1778 debug_only( _regalloc->pd_postallocate_verify_hook(); ) 1779 1780 // Apply peephole optimizations 1781 if( OptoPeephole ) { 1782 NOT_PRODUCT( TracePhase t2("peephole", &_t_peephole, TimeCompiler); ) 1783 PhasePeephole peep( _regalloc, cfg); 1784 peep.do_transform(); 1785 } 1786 1787 // Convert Nodes to instruction bits in a buffer 1788 { 1789 // %%%% workspace merge brought two timers together for one job 1790 TracePhase t2a("output", &_t_output, true); 1791 NOT_PRODUCT( TraceTime t2b(NULL, &_t_codeGeneration, TimeCompiler, false); ) 1792 Output(); 1793 } 1794 1795 print_method("Final Code"); 1796 1797 // He's dead, Jim. 1798 _cfg = (PhaseCFG*)0xdeadbeef; 1799 _regalloc = (PhaseChaitin*)0xdeadbeef; 1800 } 1801 1802 1803 //------------------------------dump_asm--------------------------------------- 1804 // Dump formatted assembly 1805 #ifndef PRODUCT 1806 void Compile::dump_asm(int *pcs, uint pc_limit) { 1807 bool cut_short = false; 1808 tty->print_cr("#"); 1809 tty->print("# "); _tf->dump(); tty->cr(); 1810 tty->print_cr("#"); 1811 1812 // For all blocks 1813 int pc = 0x0; // Program counter 1814 char starts_bundle = ' '; 1815 _regalloc->dump_frame(); 1816 1817 Node *n = NULL; 1818 for( uint i=0; i<_cfg->_num_blocks; i++ ) { 1819 if (VMThread::should_terminate()) { cut_short = true; break; } 1820 Block *b = _cfg->_blocks[i]; 1821 if (b->is_connector() && !Verbose) continue; 1822 n = b->_nodes[0]; 1823 if (pcs && n->_idx < pc_limit) 1824 tty->print("%3.3x ", pcs[n->_idx]); 1825 else 1826 tty->print(" "); 1827 b->dump_head( &_cfg->_bbs ); 1828 if (b->is_connector()) { 1829 tty->print_cr(" # Empty connector block"); 1830 } else if (b->num_preds() == 2 && b->pred(1)->is_CatchProj() && b->pred(1)->as_CatchProj()->_con == CatchProjNode::fall_through_index) { 1831 tty->print_cr(" # Block is sole successor of call"); 1832 } 1833 1834 // For all instructions 1835 Node *delay = NULL; 1836 for( uint j = 0; j<b->_nodes.size(); j++ ) { 1837 if (VMThread::should_terminate()) { cut_short = true; break; } 1838 n = b->_nodes[j]; 1839 if (valid_bundle_info(n)) { 1840 Bundle *bundle = node_bundling(n); 1841 if (bundle->used_in_unconditional_delay()) { 1842 delay = n; 1843 continue; 1844 } 1845 if (bundle->starts_bundle()) 1846 starts_bundle = '+'; 1847 } 1848 1849 if (WizardMode) n->dump(); 1850 1851 if( !n->is_Region() && // Dont print in the Assembly 1852 !n->is_Phi() && // a few noisely useless nodes 1853 !n->is_Proj() && 1854 !n->is_MachTemp() && 1855 !n->is_SafePointScalarObject() && 1856 !n->is_Catch() && // Would be nice to print exception table targets 1857 !n->is_MergeMem() && // Not very interesting 1858 !n->is_top() && // Debug info table constants 1859 !(n->is_Con() && !n->is_Mach())// Debug info table constants 1860 ) { 1861 if (pcs && n->_idx < pc_limit) 1862 tty->print("%3.3x", pcs[n->_idx]); 1863 else 1864 tty->print(" "); 1865 tty->print(" %c ", starts_bundle); 1866 starts_bundle = ' '; 1867 tty->print("\t"); 1868 n->format(_regalloc, tty); 1869 tty->cr(); 1870 } 1871 1872 // If we have an instruction with a delay slot, and have seen a delay, 1873 // then back up and print it 1874 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) { 1875 assert(delay != NULL, "no unconditional delay instruction"); 1876 if (WizardMode) delay->dump(); 1877 1878 if (node_bundling(delay)->starts_bundle()) 1879 starts_bundle = '+'; 1880 if (pcs && n->_idx < pc_limit) 1881 tty->print("%3.3x", pcs[n->_idx]); 1882 else 1883 tty->print(" "); 1884 tty->print(" %c ", starts_bundle); 1885 starts_bundle = ' '; 1886 tty->print("\t"); 1887 delay->format(_regalloc, tty); 1888 tty->print_cr(""); 1889 delay = NULL; 1890 } 1891 1892 // Dump the exception table as well 1893 if( n->is_Catch() && (Verbose || WizardMode) ) { 1894 // Print the exception table for this offset 1895 _handler_table.print_subtable_for(pc); 1896 } 1897 } 1898 1899 if (pcs && n->_idx < pc_limit) 1900 tty->print_cr("%3.3x", pcs[n->_idx]); 1901 else 1902 tty->print_cr(""); 1903 1904 assert(cut_short || delay == NULL, "no unconditional delay branch"); 1905 1906 } // End of per-block dump 1907 tty->print_cr(""); 1908 1909 if (cut_short) tty->print_cr("*** disassembly is cut short ***"); 1910 } 1911 #endif 1912 1913 //------------------------------Final_Reshape_Counts--------------------------- 1914 // This class defines counters to help identify when a method 1915 // may/must be executed using hardware with only 24-bit precision. 1916 struct Final_Reshape_Counts : public StackObj { 1917 int _call_count; // count non-inlined 'common' calls 1918 int _float_count; // count float ops requiring 24-bit precision 1919 int _double_count; // count double ops requiring more precision 1920 int _java_call_count; // count non-inlined 'java' calls 1921 int _inner_loop_count; // count loops which need alignment 1922 VectorSet _visited; // Visitation flags 1923 Node_List _tests; // Set of IfNodes & PCTableNodes 1924 1925 Final_Reshape_Counts() : 1926 _call_count(0), _float_count(0), _double_count(0), 1927 _java_call_count(0), _inner_loop_count(0), 1928 _visited( Thread::current()->resource_area() ) { } 1929 1930 void inc_call_count () { _call_count ++; } 1931 void inc_float_count () { _float_count ++; } 1932 void inc_double_count() { _double_count++; } 1933 void inc_java_call_count() { _java_call_count++; } 1934 void inc_inner_loop_count() { _inner_loop_count++; } 1935 1936 int get_call_count () const { return _call_count ; } 1937 int get_float_count () const { return _float_count ; } 1938 int get_double_count() const { return _double_count; } 1939 int get_java_call_count() const { return _java_call_count; } 1940 int get_inner_loop_count() const { return _inner_loop_count; } 1941 }; 1942 1943 static bool oop_offset_is_sane(const TypeInstPtr* tp) { 1944 ciInstanceKlass *k = tp->klass()->as_instance_klass(); 1945 // Make sure the offset goes inside the instance layout. 1946 return k->contains_field_offset(tp->offset()); 1947 // Note that OffsetBot and OffsetTop are very negative. 1948 } 1949 1950 //------------------------------final_graph_reshaping_impl---------------------- 1951 // Implement items 1-5 from final_graph_reshaping below. 1952 static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) { 1953 1954 if ( n->outcnt() == 0 ) return; // dead node 1955 uint nop = n->Opcode(); 1956 1957 // Check for 2-input instruction with "last use" on right input. 1958 // Swap to left input. Implements item (2). 1959 if( n->req() == 3 && // two-input instruction 1960 n->in(1)->outcnt() > 1 && // left use is NOT a last use 1961 (!n->in(1)->is_Phi() || n->in(1)->in(2) != n) && // it is not data loop 1962 n->in(2)->outcnt() == 1 &&// right use IS a last use 1963 !n->in(2)->is_Con() ) { // right use is not a constant 1964 // Check for commutative opcode 1965 switch( nop ) { 1966 case Op_AddI: case Op_AddF: case Op_AddD: case Op_AddL: 1967 case Op_MaxI: case Op_MinI: 1968 case Op_MulI: case Op_MulF: case Op_MulD: case Op_MulL: 1969 case Op_AndL: case Op_XorL: case Op_OrL: 1970 case Op_AndI: case Op_XorI: case Op_OrI: { 1971 // Move "last use" input to left by swapping inputs 1972 n->swap_edges(1, 2); 1973 break; 1974 } 1975 default: 1976 break; 1977 } 1978 } 1979 1980 // Count FPU ops and common calls, implements item (3) 1981 switch( nop ) { 1982 // Count all float operations that may use FPU 1983 case Op_AddF: 1984 case Op_SubF: 1985 case Op_MulF: 1986 case Op_DivF: 1987 case Op_NegF: 1988 case Op_ModF: 1989 case Op_ConvI2F: 1990 case Op_ConF: 1991 case Op_CmpF: 1992 case Op_CmpF3: 1993 // case Op_ConvL2F: // longs are split into 32-bit halves 1994 frc.inc_float_count(); 1995 break; 1996 1997 case Op_ConvF2D: 1998 case Op_ConvD2F: 1999 frc.inc_float_count(); 2000 frc.inc_double_count(); 2001 break; 2002 2003 // Count all double operations that may use FPU 2004 case Op_AddD: 2005 case Op_SubD: 2006 case Op_MulD: 2007 case Op_DivD: 2008 case Op_NegD: 2009 case Op_ModD: 2010 case Op_ConvI2D: 2011 case Op_ConvD2I: 2012 // case Op_ConvL2D: // handled by leaf call 2013 // case Op_ConvD2L: // handled by leaf call 2014 case Op_ConD: 2015 case Op_CmpD: 2016 case Op_CmpD3: 2017 frc.inc_double_count(); 2018 break; 2019 case Op_Opaque1: // Remove Opaque Nodes before matching 2020 case Op_Opaque2: // Remove Opaque Nodes before matching 2021 n->subsume_by(n->in(1)); 2022 break; 2023 case Op_CallStaticJava: 2024 case Op_CallJava: 2025 case Op_CallDynamicJava: 2026 frc.inc_java_call_count(); // Count java call site; 2027 case Op_CallRuntime: 2028 case Op_CallLeaf: 2029 case Op_CallLeafNoFP: { 2030 assert( n->is_Call(), "" ); 2031 CallNode *call = n->as_Call(); 2032 // Count call sites where the FP mode bit would have to be flipped. 2033 // Do not count uncommon runtime calls: 2034 // uncommon_trap, _complete_monitor_locking, _complete_monitor_unlocking, 2035 // _new_Java, _new_typeArray, _new_objArray, _rethrow_Java, ... 2036 if( !call->is_CallStaticJava() || !call->as_CallStaticJava()->_name ) { 2037 frc.inc_call_count(); // Count the call site 2038 } else { // See if uncommon argument is shared 2039 Node *n = call->in(TypeFunc::Parms); 2040 int nop = n->Opcode(); 2041 // Clone shared simple arguments to uncommon calls, item (1). 2042 if( n->outcnt() > 1 && 2043 !n->is_Proj() && 2044 nop != Op_CreateEx && 2045 nop != Op_CheckCastPP && 2046 nop != Op_DecodeN && 2047 !n->is_Mem() ) { 2048 Node *x = n->clone(); 2049 call->set_req( TypeFunc::Parms, x ); 2050 } 2051 } 2052 break; 2053 } 2054 2055 case Op_StoreD: 2056 case Op_LoadD: 2057 case Op_LoadD_unaligned: 2058 frc.inc_double_count(); 2059 goto handle_mem; 2060 case Op_StoreF: 2061 case Op_LoadF: 2062 frc.inc_float_count(); 2063 goto handle_mem; 2064 2065 case Op_StoreB: 2066 case Op_StoreC: 2067 case Op_StoreCM: 2068 case Op_StorePConditional: 2069 case Op_StoreI: 2070 case Op_StoreL: 2071 case Op_StoreIConditional: 2072 case Op_StoreLConditional: 2073 case Op_CompareAndSwapI: 2074 case Op_CompareAndSwapL: 2075 case Op_CompareAndSwapP: 2076 case Op_CompareAndSwapN: 2077 case Op_StoreP: 2078 case Op_StoreN: 2079 case Op_LoadB: 2080 case Op_LoadUB: 2081 case Op_LoadUS: 2082 case Op_LoadI: 2083 case Op_LoadUI2L: 2084 case Op_LoadKlass: 2085 case Op_LoadNKlass: 2086 case Op_LoadL: 2087 case Op_LoadL_unaligned: 2088 case Op_LoadPLocked: 2089 case Op_LoadLLocked: 2090 case Op_LoadP: 2091 case Op_LoadN: 2092 case Op_LoadRange: 2093 case Op_LoadS: { 2094 handle_mem: 2095 #ifdef ASSERT 2096 if( VerifyOptoOopOffsets ) { 2097 assert( n->is_Mem(), "" ); 2098 MemNode *mem = (MemNode*)n; 2099 // Check to see if address types have grounded out somehow. 2100 const TypeInstPtr *tp = mem->in(MemNode::Address)->bottom_type()->isa_instptr(); 2101 assert( !tp || oop_offset_is_sane(tp), "" ); 2102 } 2103 #endif 2104 break; 2105 } 2106 2107 case Op_AddP: { // Assert sane base pointers 2108 Node *addp = n->in(AddPNode::Address); 2109 assert( !addp->is_AddP() || 2110 addp->in(AddPNode::Base)->is_top() || // Top OK for allocation 2111 addp->in(AddPNode::Base) == n->in(AddPNode::Base), 2112 "Base pointers must match" ); 2113 #ifdef _LP64 2114 if (UseCompressedOops && 2115 addp->Opcode() == Op_ConP && 2116 addp == n->in(AddPNode::Base) && 2117 n->in(AddPNode::Offset)->is_Con()) { 2118 // Use addressing with narrow klass to load with offset on x86. 2119 // On sparc loading 32-bits constant and decoding it have less 2120 // instructions (4) then load 64-bits constant (7). 2121 // Do this transformation here since IGVN will convert ConN back to ConP. 2122 const Type* t = addp->bottom_type(); 2123 if (t->isa_oopptr()) { 2124 Node* nn = NULL; 2125 2126 // Look for existing ConN node of the same exact type. 2127 Compile* C = Compile::current(); 2128 Node* r = C->root(); 2129 uint cnt = r->outcnt(); 2130 for (uint i = 0; i < cnt; i++) { 2131 Node* m = r->raw_out(i); 2132 if (m!= NULL && m->Opcode() == Op_ConN && 2133 m->bottom_type()->make_ptr() == t) { 2134 nn = m; 2135 break; 2136 } 2137 } 2138 if (nn != NULL) { 2139 // Decode a narrow oop to match address 2140 // [R12 + narrow_oop_reg<<3 + offset] 2141 nn = new (C, 2) DecodeNNode(nn, t); 2142 n->set_req(AddPNode::Base, nn); 2143 n->set_req(AddPNode::Address, nn); 2144 if (addp->outcnt() == 0) { 2145 addp->disconnect_inputs(NULL); 2146 } 2147 } 2148 } 2149 } 2150 #endif 2151 break; 2152 } 2153 2154 #ifdef _LP64 2155 case Op_CastPP: 2156 if (n->in(1)->is_DecodeN() && Universe::narrow_oop_use_implicit_null_checks()) { 2157 Compile* C = Compile::current(); 2158 Node* in1 = n->in(1); 2159 const Type* t = n->bottom_type(); 2160 Node* new_in1 = in1->clone(); 2161 new_in1->as_DecodeN()->set_type(t); 2162 2163 if (!Matcher::clone_shift_expressions) { 2164 // 2165 // x86, ARM and friends can handle 2 adds in addressing mode 2166 // and Matcher can fold a DecodeN node into address by using 2167 // a narrow oop directly and do implicit NULL check in address: 2168 // 2169 // [R12 + narrow_oop_reg<<3 + offset] 2170 // NullCheck narrow_oop_reg 2171 // 2172 // On other platforms (Sparc) we have to keep new DecodeN node and 2173 // use it to do implicit NULL check in address: 2174 // 2175 // decode_not_null narrow_oop_reg, base_reg 2176 // [base_reg + offset] 2177 // NullCheck base_reg 2178 // 2179 // Pin the new DecodeN node to non-null path on these platform (Sparc) 2180 // to keep the information to which NULL check the new DecodeN node 2181 // corresponds to use it as value in implicit_null_check(). 2182 // 2183 new_in1->set_req(0, n->in(0)); 2184 } 2185 2186 n->subsume_by(new_in1); 2187 if (in1->outcnt() == 0) { 2188 in1->disconnect_inputs(NULL); 2189 } 2190 } 2191 break; 2192 2193 case Op_CmpP: 2194 // Do this transformation here to preserve CmpPNode::sub() and 2195 // other TypePtr related Ideal optimizations (for example, ptr nullness). 2196 if (n->in(1)->is_DecodeN() || n->in(2)->is_DecodeN()) { 2197 Node* in1 = n->in(1); 2198 Node* in2 = n->in(2); 2199 if (!in1->is_DecodeN()) { 2200 in2 = in1; 2201 in1 = n->in(2); 2202 } 2203 assert(in1->is_DecodeN(), "sanity"); 2204 2205 Compile* C = Compile::current(); 2206 Node* new_in2 = NULL; 2207 if (in2->is_DecodeN()) { 2208 new_in2 = in2->in(1); 2209 } else if (in2->Opcode() == Op_ConP) { 2210 const Type* t = in2->bottom_type(); 2211 if (t == TypePtr::NULL_PTR && Universe::narrow_oop_use_implicit_null_checks()) { 2212 new_in2 = ConNode::make(C, TypeNarrowOop::NULL_PTR); 2213 // 2214 // This transformation together with CastPP transformation above 2215 // will generated code for implicit NULL checks for compressed oops. 2216 // 2217 // The original code after Optimize() 2218 // 2219 // LoadN memory, narrow_oop_reg 2220 // decode narrow_oop_reg, base_reg 2221 // CmpP base_reg, NULL 2222 // CastPP base_reg // NotNull 2223 // Load [base_reg + offset], val_reg 2224 // 2225 // after these transformations will be 2226 // 2227 // LoadN memory, narrow_oop_reg 2228 // CmpN narrow_oop_reg, NULL 2229 // decode_not_null narrow_oop_reg, base_reg 2230 // Load [base_reg + offset], val_reg 2231 // 2232 // and the uncommon path (== NULL) will use narrow_oop_reg directly 2233 // since narrow oops can be used in debug info now (see the code in 2234 // final_graph_reshaping_walk()). 2235 // 2236 // At the end the code will be matched to 2237 // on x86: 2238 // 2239 // Load_narrow_oop memory, narrow_oop_reg 2240 // Load [R12 + narrow_oop_reg<<3 + offset], val_reg 2241 // NullCheck narrow_oop_reg 2242 // 2243 // and on sparc: 2244 // 2245 // Load_narrow_oop memory, narrow_oop_reg 2246 // decode_not_null narrow_oop_reg, base_reg 2247 // Load [base_reg + offset], val_reg 2248 // NullCheck base_reg 2249 // 2250 } else if (t->isa_oopptr()) { 2251 new_in2 = ConNode::make(C, t->make_narrowoop()); 2252 } 2253 } 2254 if (new_in2 != NULL) { 2255 Node* cmpN = new (C, 3) CmpNNode(in1->in(1), new_in2); 2256 n->subsume_by( cmpN ); 2257 if (in1->outcnt() == 0) { 2258 in1->disconnect_inputs(NULL); 2259 } 2260 if (in2->outcnt() == 0) { 2261 in2->disconnect_inputs(NULL); 2262 } 2263 } 2264 } 2265 break; 2266 2267 case Op_DecodeN: 2268 assert(!n->in(1)->is_EncodeP(), "should be optimized out"); 2269 // DecodeN could be pinned on Sparc where it can't be fold into 2270 // an address expression, see the code for Op_CastPP above. 2271 assert(n->in(0) == NULL || !Matcher::clone_shift_expressions, "no control except on sparc"); 2272 break; 2273 2274 case Op_EncodeP: { 2275 Node* in1 = n->in(1); 2276 if (in1->is_DecodeN()) { 2277 n->subsume_by(in1->in(1)); 2278 } else if (in1->Opcode() == Op_ConP) { 2279 Compile* C = Compile::current(); 2280 const Type* t = in1->bottom_type(); 2281 if (t == TypePtr::NULL_PTR) { 2282 n->subsume_by(ConNode::make(C, TypeNarrowOop::NULL_PTR)); 2283 } else if (t->isa_oopptr()) { 2284 n->subsume_by(ConNode::make(C, t->make_narrowoop())); 2285 } 2286 } 2287 if (in1->outcnt() == 0) { 2288 in1->disconnect_inputs(NULL); 2289 } 2290 break; 2291 } 2292 2293 case Op_Proj: { 2294 if (OptimizeStringConcat) { 2295 ProjNode* p = n->as_Proj(); 2296 if (p->_is_io_use) { 2297 // Separate projections were used for the exception path which 2298 // are normally removed by a late inline. If it wasn't inlined 2299 // then they will hang around and should just be replaced with 2300 // the original one. 2301 Node* proj = NULL; 2302 // Replace with just one 2303 for (SimpleDUIterator i(p->in(0)); i.has_next(); i.next()) { 2304 Node *use = i.get(); 2305 if (use->is_Proj() && p != use && use->as_Proj()->_con == p->_con) { 2306 proj = use; 2307 break; 2308 } 2309 } 2310 assert(p != NULL, "must be found"); 2311 p->subsume_by(proj); 2312 } 2313 } 2314 break; 2315 } 2316 2317 case Op_Phi: 2318 if (n->as_Phi()->bottom_type()->isa_narrowoop()) { 2319 // The EncodeP optimization may create Phi with the same edges 2320 // for all paths. It is not handled well by Register Allocator. 2321 Node* unique_in = n->in(1); 2322 assert(unique_in != NULL, ""); 2323 uint cnt = n->req(); 2324 for (uint i = 2; i < cnt; i++) { 2325 Node* m = n->in(i); 2326 assert(m != NULL, ""); 2327 if (unique_in != m) 2328 unique_in = NULL; 2329 } 2330 if (unique_in != NULL) { 2331 n->subsume_by(unique_in); 2332 } 2333 } 2334 break; 2335 2336 #endif 2337 2338 case Op_ModI: 2339 if (UseDivMod) { 2340 // Check if a%b and a/b both exist 2341 Node* d = n->find_similar(Op_DivI); 2342 if (d) { 2343 // Replace them with a fused divmod if supported 2344 Compile* C = Compile::current(); 2345 if (Matcher::has_match_rule(Op_DivModI)) { 2346 DivModINode* divmod = DivModINode::make(C, n); 2347 d->subsume_by(divmod->div_proj()); 2348 n->subsume_by(divmod->mod_proj()); 2349 } else { 2350 // replace a%b with a-((a/b)*b) 2351 Node* mult = new (C, 3) MulINode(d, d->in(2)); 2352 Node* sub = new (C, 3) SubINode(d->in(1), mult); 2353 n->subsume_by( sub ); 2354 } 2355 } 2356 } 2357 break; 2358 2359 case Op_ModL: 2360 if (UseDivMod) { 2361 // Check if a%b and a/b both exist 2362 Node* d = n->find_similar(Op_DivL); 2363 if (d) { 2364 // Replace them with a fused divmod if supported 2365 Compile* C = Compile::current(); 2366 if (Matcher::has_match_rule(Op_DivModL)) { 2367 DivModLNode* divmod = DivModLNode::make(C, n); 2368 d->subsume_by(divmod->div_proj()); 2369 n->subsume_by(divmod->mod_proj()); 2370 } else { 2371 // replace a%b with a-((a/b)*b) 2372 Node* mult = new (C, 3) MulLNode(d, d->in(2)); 2373 Node* sub = new (C, 3) SubLNode(d->in(1), mult); 2374 n->subsume_by( sub ); 2375 } 2376 } 2377 } 2378 break; 2379 2380 case Op_Load16B: 2381 case Op_Load8B: 2382 case Op_Load4B: 2383 case Op_Load8S: 2384 case Op_Load4S: 2385 case Op_Load2S: 2386 case Op_Load8C: 2387 case Op_Load4C: 2388 case Op_Load2C: 2389 case Op_Load4I: 2390 case Op_Load2I: 2391 case Op_Load2L: 2392 case Op_Load4F: 2393 case Op_Load2F: 2394 case Op_Load2D: 2395 case Op_Store16B: 2396 case Op_Store8B: 2397 case Op_Store4B: 2398 case Op_Store8C: 2399 case Op_Store4C: 2400 case Op_Store2C: 2401 case Op_Store4I: 2402 case Op_Store2I: 2403 case Op_Store2L: 2404 case Op_Store4F: 2405 case Op_Store2F: 2406 case Op_Store2D: 2407 break; 2408 2409 case Op_PackB: 2410 case Op_PackS: 2411 case Op_PackC: 2412 case Op_PackI: 2413 case Op_PackF: 2414 case Op_PackL: 2415 case Op_PackD: 2416 if (n->req()-1 > 2) { 2417 // Replace many operand PackNodes with a binary tree for matching 2418 PackNode* p = (PackNode*) n; 2419 Node* btp = p->binaryTreePack(Compile::current(), 1, n->req()); 2420 n->subsume_by(btp); 2421 } 2422 break; 2423 case Op_Loop: 2424 case Op_CountedLoop: 2425 if (n->as_Loop()->is_inner_loop()) { 2426 frc.inc_inner_loop_count(); 2427 } 2428 break; 2429 default: 2430 assert( !n->is_Call(), "" ); 2431 assert( !n->is_Mem(), "" ); 2432 break; 2433 } 2434 2435 // Collect CFG split points 2436 if (n->is_MultiBranch()) 2437 frc._tests.push(n); 2438 } 2439 2440 //------------------------------final_graph_reshaping_walk--------------------- 2441 // Replacing Opaque nodes with their input in final_graph_reshaping_impl(), 2442 // requires that the walk visits a node's inputs before visiting the node. 2443 static void final_graph_reshaping_walk( Node_Stack &nstack, Node *root, Final_Reshape_Counts &frc ) { 2444 ResourceArea *area = Thread::current()->resource_area(); 2445 Unique_Node_List sfpt(area); 2446 2447 frc._visited.set(root->_idx); // first, mark node as visited 2448 uint cnt = root->req(); 2449 Node *n = root; 2450 uint i = 0; 2451 while (true) { 2452 if (i < cnt) { 2453 // Place all non-visited non-null inputs onto stack 2454 Node* m = n->in(i); 2455 ++i; 2456 if (m != NULL && !frc._visited.test_set(m->_idx)) { 2457 if (m->is_SafePoint() && m->as_SafePoint()->jvms() != NULL) 2458 sfpt.push(m); 2459 cnt = m->req(); 2460 nstack.push(n, i); // put on stack parent and next input's index 2461 n = m; 2462 i = 0; 2463 } 2464 } else { 2465 // Now do post-visit work 2466 final_graph_reshaping_impl( n, frc ); 2467 if (nstack.is_empty()) 2468 break; // finished 2469 n = nstack.node(); // Get node from stack 2470 cnt = n->req(); 2471 i = nstack.index(); 2472 nstack.pop(); // Shift to the next node on stack 2473 } 2474 } 2475 2476 // Go over safepoints nodes to skip DecodeN nodes for debug edges. 2477 // It could be done for an uncommon traps or any safepoints/calls 2478 // if the DecodeN node is referenced only in a debug info. 2479 while (sfpt.size() > 0) { 2480 n = sfpt.pop(); 2481 JVMState *jvms = n->as_SafePoint()->jvms(); 2482 assert(jvms != NULL, "sanity"); 2483 int start = jvms->debug_start(); 2484 int end = n->req(); 2485 bool is_uncommon = (n->is_CallStaticJava() && 2486 n->as_CallStaticJava()->uncommon_trap_request() != 0); 2487 for (int j = start; j < end; j++) { 2488 Node* in = n->in(j); 2489 if (in->is_DecodeN()) { 2490 bool safe_to_skip = true; 2491 if (!is_uncommon ) { 2492 // Is it safe to skip? 2493 for (uint i = 0; i < in->outcnt(); i++) { 2494 Node* u = in->raw_out(i); 2495 if (!u->is_SafePoint() || 2496 u->is_Call() && u->as_Call()->has_non_debug_use(n)) { 2497 safe_to_skip = false; 2498 } 2499 } 2500 } 2501 if (safe_to_skip) { 2502 n->set_req(j, in->in(1)); 2503 } 2504 if (in->outcnt() == 0) { 2505 in->disconnect_inputs(NULL); 2506 } 2507 } 2508 } 2509 } 2510 } 2511 2512 //------------------------------final_graph_reshaping-------------------------- 2513 // Final Graph Reshaping. 2514 // 2515 // (1) Clone simple inputs to uncommon calls, so they can be scheduled late 2516 // and not commoned up and forced early. Must come after regular 2517 // optimizations to avoid GVN undoing the cloning. Clone constant 2518 // inputs to Loop Phis; these will be split by the allocator anyways. 2519 // Remove Opaque nodes. 2520 // (2) Move last-uses by commutative operations to the left input to encourage 2521 // Intel update-in-place two-address operations and better register usage 2522 // on RISCs. Must come after regular optimizations to avoid GVN Ideal 2523 // calls canonicalizing them back. 2524 // (3) Count the number of double-precision FP ops, single-precision FP ops 2525 // and call sites. On Intel, we can get correct rounding either by 2526 // forcing singles to memory (requires extra stores and loads after each 2527 // FP bytecode) or we can set a rounding mode bit (requires setting and 2528 // clearing the mode bit around call sites). The mode bit is only used 2529 // if the relative frequency of single FP ops to calls is low enough. 2530 // This is a key transform for SPEC mpeg_audio. 2531 // (4) Detect infinite loops; blobs of code reachable from above but not 2532 // below. Several of the Code_Gen algorithms fail on such code shapes, 2533 // so we simply bail out. Happens a lot in ZKM.jar, but also happens 2534 // from time to time in other codes (such as -Xcomp finalizer loops, etc). 2535 // Detection is by looking for IfNodes where only 1 projection is 2536 // reachable from below or CatchNodes missing some targets. 2537 // (5) Assert for insane oop offsets in debug mode. 2538 2539 bool Compile::final_graph_reshaping() { 2540 // an infinite loop may have been eliminated by the optimizer, 2541 // in which case the graph will be empty. 2542 if (root()->req() == 1) { 2543 record_method_not_compilable("trivial infinite loop"); 2544 return true; 2545 } 2546 2547 Final_Reshape_Counts frc; 2548 2549 // Visit everybody reachable! 2550 // Allocate stack of size C->unique()/2 to avoid frequent realloc 2551 Node_Stack nstack(unique() >> 1); 2552 final_graph_reshaping_walk(nstack, root(), frc); 2553 2554 // Check for unreachable (from below) code (i.e., infinite loops). 2555 for( uint i = 0; i < frc._tests.size(); i++ ) { 2556 MultiBranchNode *n = frc._tests[i]->as_MultiBranch(); 2557 // Get number of CFG targets. 2558 // Note that PCTables include exception targets after calls. 2559 uint required_outcnt = n->required_outcnt(); 2560 if (n->outcnt() != required_outcnt) { 2561 // Check for a few special cases. Rethrow Nodes never take the 2562 // 'fall-thru' path, so expected kids is 1 less. 2563 if (n->is_PCTable() && n->in(0) && n->in(0)->in(0)) { 2564 if (n->in(0)->in(0)->is_Call()) { 2565 CallNode *call = n->in(0)->in(0)->as_Call(); 2566 if (call->entry_point() == OptoRuntime::rethrow_stub()) { 2567 required_outcnt--; // Rethrow always has 1 less kid 2568 } else if (call->req() > TypeFunc::Parms && 2569 call->is_CallDynamicJava()) { 2570 // Check for null receiver. In such case, the optimizer has 2571 // detected that the virtual call will always result in a null 2572 // pointer exception. The fall-through projection of this CatchNode 2573 // will not be populated. 2574 Node *arg0 = call->in(TypeFunc::Parms); 2575 if (arg0->is_Type() && 2576 arg0->as_Type()->type()->higher_equal(TypePtr::NULL_PTR)) { 2577 required_outcnt--; 2578 } 2579 } else if (call->entry_point() == OptoRuntime::new_array_Java() && 2580 call->req() > TypeFunc::Parms+1 && 2581 call->is_CallStaticJava()) { 2582 // Check for negative array length. In such case, the optimizer has 2583 // detected that the allocation attempt will always result in an 2584 // exception. There is no fall-through projection of this CatchNode . 2585 Node *arg1 = call->in(TypeFunc::Parms+1); 2586 if (arg1->is_Type() && 2587 arg1->as_Type()->type()->join(TypeInt::POS)->empty()) { 2588 required_outcnt--; 2589 } 2590 } 2591 } 2592 } 2593 // Recheck with a better notion of 'required_outcnt' 2594 if (n->outcnt() != required_outcnt) { 2595 record_method_not_compilable("malformed control flow"); 2596 return true; // Not all targets reachable! 2597 } 2598 } 2599 // Check that I actually visited all kids. Unreached kids 2600 // must be infinite loops. 2601 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) 2602 if (!frc._visited.test(n->fast_out(j)->_idx)) { 2603 record_method_not_compilable("infinite loop"); 2604 return true; // Found unvisited kid; must be unreach 2605 } 2606 } 2607 2608 // If original bytecodes contained a mixture of floats and doubles 2609 // check if the optimizer has made it homogenous, item (3). 2610 if( Use24BitFPMode && Use24BitFP && UseSSE == 0 && 2611 frc.get_float_count() > 32 && 2612 frc.get_double_count() == 0 && 2613 (10 * frc.get_call_count() < frc.get_float_count()) ) { 2614 set_24_bit_selection_and_mode( false, true ); 2615 } 2616 2617 set_java_calls(frc.get_java_call_count()); 2618 set_inner_loops(frc.get_inner_loop_count()); 2619 2620 // No infinite loops, no reason to bail out. 2621 return false; 2622 } 2623 2624 //-----------------------------too_many_traps---------------------------------- 2625 // Report if there are too many traps at the current method and bci. 2626 // Return true if there was a trap, and/or PerMethodTrapLimit is exceeded. 2627 bool Compile::too_many_traps(ciMethod* method, 2628 int bci, 2629 Deoptimization::DeoptReason reason) { 2630 ciMethodData* md = method->method_data(); 2631 if (md->is_empty()) { 2632 // Assume the trap has not occurred, or that it occurred only 2633 // because of a transient condition during start-up in the interpreter. 2634 return false; 2635 } 2636 if (md->has_trap_at(bci, reason) != 0) { 2637 // Assume PerBytecodeTrapLimit==0, for a more conservative heuristic. 2638 // Also, if there are multiple reasons, or if there is no per-BCI record, 2639 // assume the worst. 2640 if (log()) 2641 log()->elem("observe trap='%s' count='%d'", 2642 Deoptimization::trap_reason_name(reason), 2643 md->trap_count(reason)); 2644 return true; 2645 } else { 2646 // Ignore method/bci and see if there have been too many globally. 2647 return too_many_traps(reason, md); 2648 } 2649 } 2650 2651 // Less-accurate variant which does not require a method and bci. 2652 bool Compile::too_many_traps(Deoptimization::DeoptReason reason, 2653 ciMethodData* logmd) { 2654 if (trap_count(reason) >= (uint)PerMethodTrapLimit) { 2655 // Too many traps globally. 2656 // Note that we use cumulative trap_count, not just md->trap_count. 2657 if (log()) { 2658 int mcount = (logmd == NULL)? -1: (int)logmd->trap_count(reason); 2659 log()->elem("observe trap='%s' count='0' mcount='%d' ccount='%d'", 2660 Deoptimization::trap_reason_name(reason), 2661 mcount, trap_count(reason)); 2662 } 2663 return true; 2664 } else { 2665 // The coast is clear. 2666 return false; 2667 } 2668 } 2669 2670 //--------------------------too_many_recompiles-------------------------------- 2671 // Report if there are too many recompiles at the current method and bci. 2672 // Consults PerBytecodeRecompilationCutoff and PerMethodRecompilationCutoff. 2673 // Is not eager to return true, since this will cause the compiler to use 2674 // Action_none for a trap point, to avoid too many recompilations. 2675 bool Compile::too_many_recompiles(ciMethod* method, 2676 int bci, 2677 Deoptimization::DeoptReason reason) { 2678 ciMethodData* md = method->method_data(); 2679 if (md->is_empty()) { 2680 // Assume the trap has not occurred, or that it occurred only 2681 // because of a transient condition during start-up in the interpreter. 2682 return false; 2683 } 2684 // Pick a cutoff point well within PerBytecodeRecompilationCutoff. 2685 uint bc_cutoff = (uint) PerBytecodeRecompilationCutoff / 8; 2686 uint m_cutoff = (uint) PerMethodRecompilationCutoff / 2 + 1; // not zero 2687 Deoptimization::DeoptReason per_bc_reason 2688 = Deoptimization::reason_recorded_per_bytecode_if_any(reason); 2689 if ((per_bc_reason == Deoptimization::Reason_none 2690 || md->has_trap_at(bci, reason) != 0) 2691 // The trap frequency measure we care about is the recompile count: 2692 && md->trap_recompiled_at(bci) 2693 && md->overflow_recompile_count() >= bc_cutoff) { 2694 // Do not emit a trap here if it has already caused recompilations. 2695 // Also, if there are multiple reasons, or if there is no per-BCI record, 2696 // assume the worst. 2697 if (log()) 2698 log()->elem("observe trap='%s recompiled' count='%d' recompiles2='%d'", 2699 Deoptimization::trap_reason_name(reason), 2700 md->trap_count(reason), 2701 md->overflow_recompile_count()); 2702 return true; 2703 } else if (trap_count(reason) != 0 2704 && decompile_count() >= m_cutoff) { 2705 // Too many recompiles globally, and we have seen this sort of trap. 2706 // Use cumulative decompile_count, not just md->decompile_count. 2707 if (log()) 2708 log()->elem("observe trap='%s' count='%d' mcount='%d' decompiles='%d' mdecompiles='%d'", 2709 Deoptimization::trap_reason_name(reason), 2710 md->trap_count(reason), trap_count(reason), 2711 md->decompile_count(), decompile_count()); 2712 return true; 2713 } else { 2714 // The coast is clear. 2715 return false; 2716 } 2717 } 2718 2719 2720 #ifndef PRODUCT 2721 //------------------------------verify_graph_edges--------------------------- 2722 // Walk the Graph and verify that there is a one-to-one correspondence 2723 // between Use-Def edges and Def-Use edges in the graph. 2724 void Compile::verify_graph_edges(bool no_dead_code) { 2725 if (VerifyGraphEdges) { 2726 ResourceArea *area = Thread::current()->resource_area(); 2727 Unique_Node_List visited(area); 2728 // Call recursive graph walk to check edges 2729 _root->verify_edges(visited); 2730 if (no_dead_code) { 2731 // Now make sure that no visited node is used by an unvisited node. 2732 bool dead_nodes = 0; 2733 Unique_Node_List checked(area); 2734 while (visited.size() > 0) { 2735 Node* n = visited.pop(); 2736 checked.push(n); 2737 for (uint i = 0; i < n->outcnt(); i++) { 2738 Node* use = n->raw_out(i); 2739 if (checked.member(use)) continue; // already checked 2740 if (visited.member(use)) continue; // already in the graph 2741 if (use->is_Con()) continue; // a dead ConNode is OK 2742 // At this point, we have found a dead node which is DU-reachable. 2743 if (dead_nodes++ == 0) 2744 tty->print_cr("*** Dead nodes reachable via DU edges:"); 2745 use->dump(2); 2746 tty->print_cr("---"); 2747 checked.push(use); // No repeats; pretend it is now checked. 2748 } 2749 } 2750 assert(dead_nodes == 0, "using nodes must be reachable from root"); 2751 } 2752 } 2753 } 2754 #endif 2755 2756 // The Compile object keeps track of failure reasons separately from the ciEnv. 2757 // This is required because there is not quite a 1-1 relation between the 2758 // ciEnv and its compilation task and the Compile object. Note that one 2759 // ciEnv might use two Compile objects, if C2Compiler::compile_method decides 2760 // to backtrack and retry without subsuming loads. Other than this backtracking 2761 // behavior, the Compile's failure reason is quietly copied up to the ciEnv 2762 // by the logic in C2Compiler. 2763 void Compile::record_failure(const char* reason) { 2764 if (log() != NULL) { 2765 log()->elem("failure reason='%s' phase='compile'", reason); 2766 } 2767 if (_failure_reason == NULL) { 2768 // Record the first failure reason. 2769 _failure_reason = reason; 2770 } 2771 if (!C->failure_reason_is(C2Compiler::retry_no_subsuming_loads())) { 2772 C->print_method(_failure_reason); 2773 } 2774 _root = NULL; // flush the graph, too 2775 } 2776 2777 Compile::TracePhase::TracePhase(const char* name, elapsedTimer* accumulator, bool dolog) 2778 : TraceTime(NULL, accumulator, false NOT_PRODUCT( || TimeCompiler ), false) 2779 { 2780 if (dolog) { 2781 C = Compile::current(); 2782 _log = C->log(); 2783 } else { 2784 C = NULL; 2785 _log = NULL; 2786 } 2787 if (_log != NULL) { 2788 _log->begin_head("phase name='%s' nodes='%d'", name, C->unique()); 2789 _log->stamp(); 2790 _log->end_head(); 2791 } 2792 } 2793 2794 Compile::TracePhase::~TracePhase() { 2795 if (_log != NULL) { 2796 _log->done("phase nodes='%d'", C->unique()); 2797 } 2798 }