1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "asm/macroAssembler.hpp" 27 #include "asm/macroAssembler.inline.hpp" 28 #include "ci/ciReplay.hpp" 29 #include "classfile/systemDictionary.hpp" 30 #include "code/exceptionHandlerTable.hpp" 31 #include "code/nmethod.hpp" 32 #include "compiler/compileBroker.hpp" 33 #include "compiler/compileLog.hpp" 34 #include "compiler/disassembler.hpp" 35 #include "compiler/oopMap.hpp" 36 #include "memory/resourceArea.hpp" 37 #include "opto/addnode.hpp" 38 #include "opto/block.hpp" 39 #include "opto/c2compiler.hpp" 40 #include "opto/callGenerator.hpp" 41 #include "opto/callnode.hpp" 42 #include "opto/castnode.hpp" 43 #include "opto/cfgnode.hpp" 44 #include "opto/chaitin.hpp" 45 #include "opto/compile.hpp" 46 #include "opto/connode.hpp" 47 #include "opto/convertnode.hpp" 48 #include "opto/divnode.hpp" 49 #include "opto/escape.hpp" 50 #include "opto/idealGraphPrinter.hpp" 51 #include "opto/loopnode.hpp" 52 #include "opto/machnode.hpp" 53 #include "opto/macro.hpp" 54 #include "opto/matcher.hpp" 55 #include "opto/mathexactnode.hpp" 56 #include "opto/memnode.hpp" 57 #include "opto/mulnode.hpp" 58 #include "opto/narrowptrnode.hpp" 59 #include "opto/node.hpp" 60 #include "opto/opcodes.hpp" 61 #include "opto/output.hpp" 62 #include "opto/parse.hpp" 63 #include "opto/phaseX.hpp" 64 #include "opto/rootnode.hpp" 65 #include "opto/runtime.hpp" 66 #include "opto/stringopts.hpp" 67 #include "opto/type.hpp" 68 #include "opto/valuetypenode.hpp" 69 #include "opto/vectornode.hpp" 70 #include "runtime/arguments.hpp" 71 #include "runtime/sharedRuntime.hpp" 72 #include "runtime/signature.hpp" 73 #include "runtime/stubRoutines.hpp" 74 #include "runtime/timer.hpp" 75 #include "utilities/copy.hpp" 76 77 78 // -------------------- Compile::mach_constant_base_node ----------------------- 79 // Constant table base node singleton. 80 MachConstantBaseNode* Compile::mach_constant_base_node() { 81 if (_mach_constant_base_node == NULL) { 82 _mach_constant_base_node = new MachConstantBaseNode(); 83 _mach_constant_base_node->add_req(C->root()); 84 } 85 return _mach_constant_base_node; 86 } 87 88 89 /// Support for intrinsics. 90 91 // Return the index at which m must be inserted (or already exists). 92 // The sort order is by the address of the ciMethod, with is_virtual as minor key. 93 class IntrinsicDescPair { 94 private: 95 ciMethod* _m; 96 bool _is_virtual; 97 public: 98 IntrinsicDescPair(ciMethod* m, bool is_virtual) : _m(m), _is_virtual(is_virtual) {} 99 static int compare(IntrinsicDescPair* const& key, CallGenerator* const& elt) { 100 ciMethod* m= elt->method(); 101 ciMethod* key_m = key->_m; 102 if (key_m < m) return -1; 103 else if (key_m > m) return 1; 104 else { 105 bool is_virtual = elt->is_virtual(); 106 bool key_virtual = key->_is_virtual; 107 if (key_virtual < is_virtual) return -1; 108 else if (key_virtual > is_virtual) return 1; 109 else return 0; 110 } 111 } 112 }; 113 int Compile::intrinsic_insertion_index(ciMethod* m, bool is_virtual, bool& found) { 114 #ifdef ASSERT 115 for (int i = 1; i < _intrinsics->length(); i++) { 116 CallGenerator* cg1 = _intrinsics->at(i-1); 117 CallGenerator* cg2 = _intrinsics->at(i); 118 assert(cg1->method() != cg2->method() 119 ? cg1->method() < cg2->method() 120 : cg1->is_virtual() < cg2->is_virtual(), 121 "compiler intrinsics list must stay sorted"); 122 } 123 #endif 124 IntrinsicDescPair pair(m, is_virtual); 125 return _intrinsics->find_sorted<IntrinsicDescPair*, IntrinsicDescPair::compare>(&pair, found); 126 } 127 128 void Compile::register_intrinsic(CallGenerator* cg) { 129 if (_intrinsics == NULL) { 130 _intrinsics = new (comp_arena())GrowableArray<CallGenerator*>(comp_arena(), 60, 0, NULL); 131 } 132 int len = _intrinsics->length(); 133 bool found = false; 134 int index = intrinsic_insertion_index(cg->method(), cg->is_virtual(), found); 135 assert(!found, "registering twice"); 136 _intrinsics->insert_before(index, cg); 137 assert(find_intrinsic(cg->method(), cg->is_virtual()) == cg, "registration worked"); 138 } 139 140 CallGenerator* Compile::find_intrinsic(ciMethod* m, bool is_virtual) { 141 assert(m->is_loaded(), "don't try this on unloaded methods"); 142 if (_intrinsics != NULL) { 143 bool found = false; 144 int index = intrinsic_insertion_index(m, is_virtual, found); 145 if (found) { 146 return _intrinsics->at(index); 147 } 148 } 149 // Lazily create intrinsics for intrinsic IDs well-known in the runtime. 150 if (m->intrinsic_id() != vmIntrinsics::_none && 151 m->intrinsic_id() <= vmIntrinsics::LAST_COMPILER_INLINE) { 152 CallGenerator* cg = make_vm_intrinsic(m, is_virtual); 153 if (cg != NULL) { 154 // Save it for next time: 155 register_intrinsic(cg); 156 return cg; 157 } else { 158 gather_intrinsic_statistics(m->intrinsic_id(), is_virtual, _intrinsic_disabled); 159 } 160 } 161 return NULL; 162 } 163 164 // Compile:: register_library_intrinsics and make_vm_intrinsic are defined 165 // in library_call.cpp. 166 167 168 #ifndef PRODUCT 169 // statistics gathering... 170 171 juint Compile::_intrinsic_hist_count[vmIntrinsics::ID_LIMIT] = {0}; 172 jubyte Compile::_intrinsic_hist_flags[vmIntrinsics::ID_LIMIT] = {0}; 173 174 bool Compile::gather_intrinsic_statistics(vmIntrinsics::ID id, bool is_virtual, int flags) { 175 assert(id > vmIntrinsics::_none && id < vmIntrinsics::ID_LIMIT, "oob"); 176 int oflags = _intrinsic_hist_flags[id]; 177 assert(flags != 0, "what happened?"); 178 if (is_virtual) { 179 flags |= _intrinsic_virtual; 180 } 181 bool changed = (flags != oflags); 182 if ((flags & _intrinsic_worked) != 0) { 183 juint count = (_intrinsic_hist_count[id] += 1); 184 if (count == 1) { 185 changed = true; // first time 186 } 187 // increment the overall count also: 188 _intrinsic_hist_count[vmIntrinsics::_none] += 1; 189 } 190 if (changed) { 191 if (((oflags ^ flags) & _intrinsic_virtual) != 0) { 192 // Something changed about the intrinsic's virtuality. 193 if ((flags & _intrinsic_virtual) != 0) { 194 // This is the first use of this intrinsic as a virtual call. 195 if (oflags != 0) { 196 // We already saw it as a non-virtual, so note both cases. 197 flags |= _intrinsic_both; 198 } 199 } else if ((oflags & _intrinsic_both) == 0) { 200 // This is the first use of this intrinsic as a non-virtual 201 flags |= _intrinsic_both; 202 } 203 } 204 _intrinsic_hist_flags[id] = (jubyte) (oflags | flags); 205 } 206 // update the overall flags also: 207 _intrinsic_hist_flags[vmIntrinsics::_none] |= (jubyte) flags; 208 return changed; 209 } 210 211 static char* format_flags(int flags, char* buf) { 212 buf[0] = 0; 213 if ((flags & Compile::_intrinsic_worked) != 0) strcat(buf, ",worked"); 214 if ((flags & Compile::_intrinsic_failed) != 0) strcat(buf, ",failed"); 215 if ((flags & Compile::_intrinsic_disabled) != 0) strcat(buf, ",disabled"); 216 if ((flags & Compile::_intrinsic_virtual) != 0) strcat(buf, ",virtual"); 217 if ((flags & Compile::_intrinsic_both) != 0) strcat(buf, ",nonvirtual"); 218 if (buf[0] == 0) strcat(buf, ","); 219 assert(buf[0] == ',', "must be"); 220 return &buf[1]; 221 } 222 223 void Compile::print_intrinsic_statistics() { 224 char flagsbuf[100]; 225 ttyLocker ttyl; 226 if (xtty != NULL) xtty->head("statistics type='intrinsic'"); 227 tty->print_cr("Compiler intrinsic usage:"); 228 juint total = _intrinsic_hist_count[vmIntrinsics::_none]; 229 if (total == 0) total = 1; // avoid div0 in case of no successes 230 #define PRINT_STAT_LINE(name, c, f) \ 231 tty->print_cr(" %4d (%4.1f%%) %s (%s)", (int)(c), ((c) * 100.0) / total, name, f); 232 for (int index = 1 + (int)vmIntrinsics::_none; index < (int)vmIntrinsics::ID_LIMIT; index++) { 233 vmIntrinsics::ID id = (vmIntrinsics::ID) index; 234 int flags = _intrinsic_hist_flags[id]; 235 juint count = _intrinsic_hist_count[id]; 236 if ((flags | count) != 0) { 237 PRINT_STAT_LINE(vmIntrinsics::name_at(id), count, format_flags(flags, flagsbuf)); 238 } 239 } 240 PRINT_STAT_LINE("total", total, format_flags(_intrinsic_hist_flags[vmIntrinsics::_none], flagsbuf)); 241 if (xtty != NULL) xtty->tail("statistics"); 242 } 243 244 void Compile::print_statistics() { 245 { ttyLocker ttyl; 246 if (xtty != NULL) xtty->head("statistics type='opto'"); 247 Parse::print_statistics(); 248 PhaseCCP::print_statistics(); 249 PhaseRegAlloc::print_statistics(); 250 Scheduling::print_statistics(); 251 PhasePeephole::print_statistics(); 252 PhaseIdealLoop::print_statistics(); 253 if (xtty != NULL) xtty->tail("statistics"); 254 } 255 if (_intrinsic_hist_flags[vmIntrinsics::_none] != 0) { 256 // put this under its own <statistics> element. 257 print_intrinsic_statistics(); 258 } 259 } 260 #endif //PRODUCT 261 262 // Support for bundling info 263 Bundle* Compile::node_bundling(const Node *n) { 264 assert(valid_bundle_info(n), "oob"); 265 return &_node_bundling_base[n->_idx]; 266 } 267 268 bool Compile::valid_bundle_info(const Node *n) { 269 return (_node_bundling_limit > n->_idx); 270 } 271 272 273 void Compile::gvn_replace_by(Node* n, Node* nn) { 274 for (DUIterator_Last imin, i = n->last_outs(imin); i >= imin; ) { 275 Node* use = n->last_out(i); 276 bool is_in_table = initial_gvn()->hash_delete(use); 277 uint uses_found = 0; 278 for (uint j = 0; j < use->len(); j++) { 279 if (use->in(j) == n) { 280 if (j < use->req()) 281 use->set_req(j, nn); 282 else 283 use->set_prec(j, nn); 284 uses_found++; 285 } 286 } 287 if (is_in_table) { 288 // reinsert into table 289 initial_gvn()->hash_find_insert(use); 290 } 291 record_for_igvn(use); 292 i -= uses_found; // we deleted 1 or more copies of this edge 293 } 294 } 295 296 297 static inline bool not_a_node(const Node* n) { 298 if (n == NULL) return true; 299 if (((intptr_t)n & 1) != 0) return true; // uninitialized, etc. 300 if (*(address*)n == badAddress) return true; // kill by Node::destruct 301 return false; 302 } 303 304 // Identify all nodes that are reachable from below, useful. 305 // Use breadth-first pass that records state in a Unique_Node_List, 306 // recursive traversal is slower. 307 void Compile::identify_useful_nodes(Unique_Node_List &useful) { 308 int estimated_worklist_size = live_nodes(); 309 useful.map( estimated_worklist_size, NULL ); // preallocate space 310 311 // Initialize worklist 312 if (root() != NULL) { useful.push(root()); } 313 // If 'top' is cached, declare it useful to preserve cached node 314 if( cached_top_node() ) { useful.push(cached_top_node()); } 315 316 // Push all useful nodes onto the list, breadthfirst 317 for( uint next = 0; next < useful.size(); ++next ) { 318 assert( next < unique(), "Unique useful nodes < total nodes"); 319 Node *n = useful.at(next); 320 uint max = n->len(); 321 for( uint i = 0; i < max; ++i ) { 322 Node *m = n->in(i); 323 if (not_a_node(m)) continue; 324 useful.push(m); 325 } 326 } 327 } 328 329 // Update dead_node_list with any missing dead nodes using useful 330 // list. Consider all non-useful nodes to be useless i.e., dead nodes. 331 void Compile::update_dead_node_list(Unique_Node_List &useful) { 332 uint max_idx = unique(); 333 VectorSet& useful_node_set = useful.member_set(); 334 335 for (uint node_idx = 0; node_idx < max_idx; node_idx++) { 336 // If node with index node_idx is not in useful set, 337 // mark it as dead in dead node list. 338 if (! useful_node_set.test(node_idx) ) { 339 record_dead_node(node_idx); 340 } 341 } 342 } 343 344 void Compile::remove_useless_late_inlines(GrowableArray<CallGenerator*>* inlines, Unique_Node_List &useful) { 345 int shift = 0; 346 for (int i = 0; i < inlines->length(); i++) { 347 CallGenerator* cg = inlines->at(i); 348 CallNode* call = cg->call_node(); 349 if (shift > 0) { 350 inlines->at_put(i-shift, cg); 351 } 352 if (!useful.member(call)) { 353 shift++; 354 } 355 } 356 inlines->trunc_to(inlines->length()-shift); 357 } 358 359 // Disconnect all useless nodes by disconnecting those at the boundary. 360 void Compile::remove_useless_nodes(Unique_Node_List &useful) { 361 uint next = 0; 362 while (next < useful.size()) { 363 Node *n = useful.at(next++); 364 if (n->is_SafePoint()) { 365 // We're done with a parsing phase. Replaced nodes are not valid 366 // beyond that point. 367 n->as_SafePoint()->delete_replaced_nodes(); 368 } 369 // Use raw traversal of out edges since this code removes out edges 370 int max = n->outcnt(); 371 for (int j = 0; j < max; ++j) { 372 Node* child = n->raw_out(j); 373 if (! useful.member(child)) { 374 assert(!child->is_top() || child != top(), 375 "If top is cached in Compile object it is in useful list"); 376 // Only need to remove this out-edge to the useless node 377 n->raw_del_out(j); 378 --j; 379 --max; 380 } 381 } 382 if (n->outcnt() == 1 && n->has_special_unique_user()) { 383 record_for_igvn(n->unique_out()); 384 } 385 } 386 // Remove useless macro and predicate opaq nodes 387 for (int i = C->macro_count()-1; i >= 0; i--) { 388 Node* n = C->macro_node(i); 389 if (!useful.member(n)) { 390 remove_macro_node(n); 391 } 392 } 393 // Remove useless CastII nodes with range check dependency 394 for (int i = range_check_cast_count() - 1; i >= 0; i--) { 395 Node* cast = range_check_cast_node(i); 396 if (!useful.member(cast)) { 397 remove_range_check_cast(cast); 398 } 399 } 400 // Remove useless expensive node 401 for (int i = C->expensive_count()-1; i >= 0; i--) { 402 Node* n = C->expensive_node(i); 403 if (!useful.member(n)) { 404 remove_expensive_node(n); 405 } 406 } 407 for (int i = value_type_ptr_count() - 1; i >= 0; i--) { 408 ValueTypePtrNode* vtptr = value_type_ptr(i); 409 if (!useful.member(vtptr)) { 410 remove_value_type_ptr(vtptr); 411 } 412 } 413 // clean up the late inline lists 414 remove_useless_late_inlines(&_string_late_inlines, useful); 415 remove_useless_late_inlines(&_boxing_late_inlines, useful); 416 remove_useless_late_inlines(&_late_inlines, useful); 417 debug_only(verify_graph_edges(true/*check for no_dead_code*/);) 418 } 419 420 //------------------------------frame_size_in_words----------------------------- 421 // frame_slots in units of words 422 int Compile::frame_size_in_words() const { 423 // shift is 0 in LP32 and 1 in LP64 424 const int shift = (LogBytesPerWord - LogBytesPerInt); 425 int words = _frame_slots >> shift; 426 assert( words << shift == _frame_slots, "frame size must be properly aligned in LP64" ); 427 return words; 428 } 429 430 // To bang the stack of this compiled method we use the stack size 431 // that the interpreter would need in case of a deoptimization. This 432 // removes the need to bang the stack in the deoptimization blob which 433 // in turn simplifies stack overflow handling. 434 int Compile::bang_size_in_bytes() const { 435 return MAX2(frame_size_in_bytes() + os::extra_bang_size_in_bytes(), _interpreter_frame_size); 436 } 437 438 // ============================================================================ 439 //------------------------------CompileWrapper--------------------------------- 440 class CompileWrapper : public StackObj { 441 Compile *const _compile; 442 public: 443 CompileWrapper(Compile* compile); 444 445 ~CompileWrapper(); 446 }; 447 448 CompileWrapper::CompileWrapper(Compile* compile) : _compile(compile) { 449 // the Compile* pointer is stored in the current ciEnv: 450 ciEnv* env = compile->env(); 451 assert(env == ciEnv::current(), "must already be a ciEnv active"); 452 assert(env->compiler_data() == NULL, "compile already active?"); 453 env->set_compiler_data(compile); 454 assert(compile == Compile::current(), "sanity"); 455 456 compile->set_type_dict(NULL); 457 compile->set_clone_map(new Dict(cmpkey, hashkey, _compile->comp_arena())); 458 compile->clone_map().set_clone_idx(0); 459 compile->set_type_hwm(NULL); 460 compile->set_type_last_size(0); 461 compile->set_last_tf(NULL, NULL); 462 compile->set_indexSet_arena(NULL); 463 compile->set_indexSet_free_block_list(NULL); 464 compile->init_type_arena(); 465 Type::Initialize(compile); 466 _compile->set_scratch_buffer_blob(NULL); 467 _compile->begin_method(); 468 _compile->clone_map().set_debug(_compile->has_method() && _compile->directive()->CloneMapDebugOption); 469 } 470 CompileWrapper::~CompileWrapper() { 471 _compile->end_method(); 472 if (_compile->scratch_buffer_blob() != NULL) 473 BufferBlob::free(_compile->scratch_buffer_blob()); 474 _compile->env()->set_compiler_data(NULL); 475 } 476 477 478 //----------------------------print_compile_messages--------------------------- 479 void Compile::print_compile_messages() { 480 #ifndef PRODUCT 481 // Check if recompiling 482 if (_subsume_loads == false && PrintOpto) { 483 // Recompiling without allowing machine instructions to subsume loads 484 tty->print_cr("*********************************************************"); 485 tty->print_cr("** Bailout: Recompile without subsuming loads **"); 486 tty->print_cr("*********************************************************"); 487 } 488 if (_do_escape_analysis != DoEscapeAnalysis && PrintOpto) { 489 // Recompiling without escape analysis 490 tty->print_cr("*********************************************************"); 491 tty->print_cr("** Bailout: Recompile without escape analysis **"); 492 tty->print_cr("*********************************************************"); 493 } 494 if (_eliminate_boxing != EliminateAutoBox && PrintOpto) { 495 // Recompiling without boxing elimination 496 tty->print_cr("*********************************************************"); 497 tty->print_cr("** Bailout: Recompile without boxing elimination **"); 498 tty->print_cr("*********************************************************"); 499 } 500 if (C->directive()->BreakAtCompileOption) { 501 // Open the debugger when compiling this method. 502 tty->print("### Breaking when compiling: "); 503 method()->print_short_name(); 504 tty->cr(); 505 BREAKPOINT; 506 } 507 508 if( PrintOpto ) { 509 if (is_osr_compilation()) { 510 tty->print("[OSR]%3d", _compile_id); 511 } else { 512 tty->print("%3d", _compile_id); 513 } 514 } 515 #endif 516 } 517 518 519 //-----------------------init_scratch_buffer_blob------------------------------ 520 // Construct a temporary BufferBlob and cache it for this compile. 521 void Compile::init_scratch_buffer_blob(int const_size) { 522 // If there is already a scratch buffer blob allocated and the 523 // constant section is big enough, use it. Otherwise free the 524 // current and allocate a new one. 525 BufferBlob* blob = scratch_buffer_blob(); 526 if ((blob != NULL) && (const_size <= _scratch_const_size)) { 527 // Use the current blob. 528 } else { 529 if (blob != NULL) { 530 BufferBlob::free(blob); 531 } 532 533 ResourceMark rm; 534 _scratch_const_size = const_size; 535 int size = (MAX_inst_size + MAX_stubs_size + _scratch_const_size); 536 blob = BufferBlob::create("Compile::scratch_buffer", size); 537 // Record the buffer blob for next time. 538 set_scratch_buffer_blob(blob); 539 // Have we run out of code space? 540 if (scratch_buffer_blob() == NULL) { 541 // Let CompilerBroker disable further compilations. 542 record_failure("Not enough space for scratch buffer in CodeCache"); 543 return; 544 } 545 } 546 547 // Initialize the relocation buffers 548 relocInfo* locs_buf = (relocInfo*) blob->content_end() - MAX_locs_size; 549 set_scratch_locs_memory(locs_buf); 550 } 551 552 553 //-----------------------scratch_emit_size------------------------------------- 554 // Helper function that computes size by emitting code 555 uint Compile::scratch_emit_size(const Node* n) { 556 // Start scratch_emit_size section. 557 set_in_scratch_emit_size(true); 558 559 // Emit into a trash buffer and count bytes emitted. 560 // This is a pretty expensive way to compute a size, 561 // but it works well enough if seldom used. 562 // All common fixed-size instructions are given a size 563 // method by the AD file. 564 // Note that the scratch buffer blob and locs memory are 565 // allocated at the beginning of the compile task, and 566 // may be shared by several calls to scratch_emit_size. 567 // The allocation of the scratch buffer blob is particularly 568 // expensive, since it has to grab the code cache lock. 569 BufferBlob* blob = this->scratch_buffer_blob(); 570 assert(blob != NULL, "Initialize BufferBlob at start"); 571 assert(blob->size() > MAX_inst_size, "sanity"); 572 relocInfo* locs_buf = scratch_locs_memory(); 573 address blob_begin = blob->content_begin(); 574 address blob_end = (address)locs_buf; 575 assert(blob->contains(blob_end), "sanity"); 576 CodeBuffer buf(blob_begin, blob_end - blob_begin); 577 buf.initialize_consts_size(_scratch_const_size); 578 buf.initialize_stubs_size(MAX_stubs_size); 579 assert(locs_buf != NULL, "sanity"); 580 int lsize = MAX_locs_size / 3; 581 buf.consts()->initialize_shared_locs(&locs_buf[lsize * 0], lsize); 582 buf.insts()->initialize_shared_locs( &locs_buf[lsize * 1], lsize); 583 buf.stubs()->initialize_shared_locs( &locs_buf[lsize * 2], lsize); 584 // Mark as scratch buffer. 585 buf.consts()->set_scratch_emit(); 586 buf.insts()->set_scratch_emit(); 587 buf.stubs()->set_scratch_emit(); 588 589 // Do the emission. 590 591 Label fakeL; // Fake label for branch instructions. 592 Label* saveL = NULL; 593 uint save_bnum = 0; 594 bool is_branch = n->is_MachBranch(); 595 if (is_branch) { 596 MacroAssembler masm(&buf); 597 masm.bind(fakeL); 598 n->as_MachBranch()->save_label(&saveL, &save_bnum); 599 n->as_MachBranch()->label_set(&fakeL, 0); 600 } 601 n->emit(buf, this->regalloc()); 602 603 // Emitting into the scratch buffer should not fail 604 assert (!failing(), "Must not have pending failure. Reason is: %s", failure_reason()); 605 606 if (is_branch) // Restore label. 607 n->as_MachBranch()->label_set(saveL, save_bnum); 608 609 // End scratch_emit_size section. 610 set_in_scratch_emit_size(false); 611 612 return buf.insts_size(); 613 } 614 615 616 // ============================================================================ 617 //------------------------------Compile standard------------------------------- 618 debug_only( int Compile::_debug_idx = 100000; ) 619 620 // Compile a method. entry_bci is -1 for normal compilations and indicates 621 // the continuation bci for on stack replacement. 622 623 624 Compile::Compile( ciEnv* ci_env, C2Compiler* compiler, ciMethod* target, int osr_bci, 625 bool subsume_loads, bool do_escape_analysis, bool eliminate_boxing, DirectiveSet* directive) 626 : Phase(Compiler), 627 _env(ci_env), 628 _directive(directive), 629 _log(ci_env->log()), 630 _compile_id(ci_env->compile_id()), 631 _save_argument_registers(false), 632 _stub_name(NULL), 633 _stub_function(NULL), 634 _stub_entry_point(NULL), 635 _method(target), 636 _entry_bci(osr_bci), 637 _initial_gvn(NULL), 638 _for_igvn(NULL), 639 _warm_calls(NULL), 640 _subsume_loads(subsume_loads), 641 _do_escape_analysis(do_escape_analysis), 642 _eliminate_boxing(eliminate_boxing), 643 _failure_reason(NULL), 644 _code_buffer("Compile::Fill_buffer"), 645 _orig_pc_slot(0), 646 _orig_pc_slot_offset_in_bytes(0), 647 _has_method_handle_invokes(false), 648 _mach_constant_base_node(NULL), 649 _node_bundling_limit(0), 650 _node_bundling_base(NULL), 651 _java_calls(0), 652 _inner_loops(0), 653 _scratch_const_size(-1), 654 _in_scratch_emit_size(false), 655 _dead_node_list(comp_arena()), 656 _dead_node_count(0), 657 #ifndef PRODUCT 658 _trace_opto_output(directive->TraceOptoOutputOption), 659 _in_dump_cnt(0), 660 _printer(IdealGraphPrinter::printer()), 661 #endif 662 _congraph(NULL), 663 _comp_arena(mtCompiler), 664 _node_arena(mtCompiler), 665 _old_arena(mtCompiler), 666 _Compile_types(mtCompiler), 667 _replay_inline_data(NULL), 668 _late_inlines(comp_arena(), 2, 0, NULL), 669 _string_late_inlines(comp_arena(), 2, 0, NULL), 670 _boxing_late_inlines(comp_arena(), 2, 0, NULL), 671 _late_inlines_pos(0), 672 _number_of_mh_late_inlines(0), 673 _inlining_progress(false), 674 _inlining_incrementally(false), 675 _print_inlining_list(NULL), 676 _print_inlining_stream(NULL), 677 _print_inlining_idx(0), 678 _print_inlining_output(NULL), 679 _interpreter_frame_size(0), 680 _max_node_limit(MaxNodeLimit), 681 _has_reserved_stack_access(target->has_reserved_stack_access()) { 682 C = this; 683 #ifndef PRODUCT 684 if (_printer != NULL) { 685 _printer->set_compile(this); 686 } 687 #endif 688 CompileWrapper cw(this); 689 690 if (CITimeVerbose) { 691 tty->print(" "); 692 target->holder()->name()->print(); 693 tty->print("."); 694 target->print_short_name(); 695 tty->print(" "); 696 } 697 TraceTime t1("Total compilation time", &_t_totalCompilation, CITime, CITimeVerbose); 698 TraceTime t2(NULL, &_t_methodCompilation, CITime, false); 699 700 #ifndef PRODUCT 701 bool print_opto_assembly = directive->PrintOptoAssemblyOption; 702 if (!print_opto_assembly) { 703 bool print_assembly = directive->PrintAssemblyOption; 704 if (print_assembly && !Disassembler::can_decode()) { 705 tty->print_cr("PrintAssembly request changed to PrintOptoAssembly"); 706 print_opto_assembly = true; 707 } 708 } 709 set_print_assembly(print_opto_assembly); 710 set_parsed_irreducible_loop(false); 711 712 if (directive->ReplayInlineOption) { 713 _replay_inline_data = ciReplay::load_inline_data(method(), entry_bci(), ci_env->comp_level()); 714 } 715 #endif 716 set_print_inlining(directive->PrintInliningOption || PrintOptoInlining); 717 set_print_intrinsics(directive->PrintIntrinsicsOption); 718 set_has_irreducible_loop(true); // conservative until build_loop_tree() reset it 719 720 if (ProfileTraps RTM_OPT_ONLY( || UseRTMLocking )) { 721 // Make sure the method being compiled gets its own MDO, 722 // so we can at least track the decompile_count(). 723 // Need MDO to record RTM code generation state. 724 method()->ensure_method_data(); 725 } 726 727 Init(::AliasLevel); 728 729 730 print_compile_messages(); 731 732 _ilt = InlineTree::build_inline_tree_root(); 733 734 // Even if NO memory addresses are used, MergeMem nodes must have at least 1 slice 735 assert(num_alias_types() >= AliasIdxRaw, ""); 736 737 #define MINIMUM_NODE_HASH 1023 738 // Node list that Iterative GVN will start with 739 Unique_Node_List for_igvn(comp_arena()); 740 set_for_igvn(&for_igvn); 741 742 // GVN that will be run immediately on new nodes 743 uint estimated_size = method()->code_size()*4+64; 744 estimated_size = (estimated_size < MINIMUM_NODE_HASH ? MINIMUM_NODE_HASH : estimated_size); 745 PhaseGVN gvn(node_arena(), estimated_size); 746 set_initial_gvn(&gvn); 747 748 print_inlining_init(); 749 { // Scope for timing the parser 750 TracePhase tp("parse", &timers[_t_parser]); 751 752 // Put top into the hash table ASAP. 753 initial_gvn()->transform_no_reclaim(top()); 754 755 // Set up tf(), start(), and find a CallGenerator. 756 CallGenerator* cg = NULL; 757 if (is_osr_compilation()) { 758 const TypeTuple *domain = StartOSRNode::osr_domain(); 759 const TypeTuple *range = TypeTuple::make_range(method()->signature()); 760 init_tf(TypeFunc::make(domain, range)); 761 StartNode* s = new StartOSRNode(root(), domain); 762 initial_gvn()->set_type_bottom(s); 763 init_start(s); 764 cg = CallGenerator::for_osr(method(), entry_bci()); 765 } else { 766 // Normal case. 767 init_tf(TypeFunc::make(method())); 768 StartNode* s = new StartNode(root(), tf()->domain_cc()); 769 initial_gvn()->set_type_bottom(s); 770 init_start(s); 771 if (method()->intrinsic_id() == vmIntrinsics::_Reference_get && UseG1GC) { 772 // With java.lang.ref.reference.get() we must go through the 773 // intrinsic when G1 is enabled - even when get() is the root 774 // method of the compile - so that, if necessary, the value in 775 // the referent field of the reference object gets recorded by 776 // the pre-barrier code. 777 // Specifically, if G1 is enabled, the value in the referent 778 // field is recorded by the G1 SATB pre barrier. This will 779 // result in the referent being marked live and the reference 780 // object removed from the list of discovered references during 781 // reference processing. 782 cg = find_intrinsic(method(), false); 783 } 784 if (cg == NULL) { 785 float past_uses = method()->interpreter_invocation_count(); 786 float expected_uses = past_uses; 787 cg = CallGenerator::for_inline(method(), expected_uses); 788 } 789 } 790 if (failing()) return; 791 if (cg == NULL) { 792 record_method_not_compilable("cannot parse method"); 793 return; 794 } 795 JVMState* jvms = build_start_state(start(), tf()); 796 if ((jvms = cg->generate(jvms)) == NULL) { 797 if (!failure_reason_is(C2Compiler::retry_class_loading_during_parsing())) { 798 record_method_not_compilable("method parse failed"); 799 } 800 return; 801 } 802 GraphKit kit(jvms); 803 804 if (!kit.stopped()) { 805 // Accept return values, and transfer control we know not where. 806 // This is done by a special, unique ReturnNode bound to root. 807 return_values(kit.jvms()); 808 } 809 810 if (kit.has_exceptions()) { 811 // Any exceptions that escape from this call must be rethrown 812 // to whatever caller is dynamically above us on the stack. 813 // This is done by a special, unique RethrowNode bound to root. 814 rethrow_exceptions(kit.transfer_exceptions_into_jvms()); 815 } 816 817 assert(IncrementalInline || (_late_inlines.length() == 0 && !has_mh_late_inlines()), "incremental inlining is off"); 818 819 if (_late_inlines.length() == 0 && !has_mh_late_inlines() && !failing() && has_stringbuilder()) { 820 inline_string_calls(true); 821 } 822 823 if (failing()) return; 824 825 print_method(PHASE_BEFORE_REMOVEUSELESS, 3); 826 827 // Remove clutter produced by parsing. 828 if (!failing()) { 829 ResourceMark rm; 830 PhaseRemoveUseless pru(initial_gvn(), &for_igvn); 831 } 832 } 833 834 // Note: Large methods are capped off in do_one_bytecode(). 835 if (failing()) return; 836 837 // After parsing, node notes are no longer automagic. 838 // They must be propagated by register_new_node_with_optimizer(), 839 // clone(), or the like. 840 set_default_node_notes(NULL); 841 842 for (;;) { 843 int successes = Inline_Warm(); 844 if (failing()) return; 845 if (successes == 0) break; 846 } 847 848 // Drain the list. 849 Finish_Warm(); 850 #ifndef PRODUCT 851 if (_printer && _printer->should_print(1)) { 852 _printer->print_inlining(); 853 } 854 #endif 855 856 if (failing()) return; 857 NOT_PRODUCT( verify_graph_edges(); ) 858 859 // Now optimize 860 Optimize(); 861 if (failing()) return; 862 NOT_PRODUCT( verify_graph_edges(); ) 863 864 #ifndef PRODUCT 865 if (PrintIdeal) { 866 ttyLocker ttyl; // keep the following output all in one block 867 // This output goes directly to the tty, not the compiler log. 868 // To enable tools to match it up with the compilation activity, 869 // be sure to tag this tty output with the compile ID. 870 if (xtty != NULL) { 871 xtty->head("ideal compile_id='%d'%s", compile_id(), 872 is_osr_compilation() ? " compile_kind='osr'" : 873 ""); 874 } 875 root()->dump(9999); 876 if (xtty != NULL) { 877 xtty->tail("ideal"); 878 } 879 } 880 #endif 881 882 NOT_PRODUCT( verify_barriers(); ) 883 884 // Dump compilation data to replay it. 885 if (directive->DumpReplayOption) { 886 env()->dump_replay_data(_compile_id); 887 } 888 if (directive->DumpInlineOption && (ilt() != NULL)) { 889 env()->dump_inline_data(_compile_id); 890 } 891 892 // Now that we know the size of all the monitors we can add a fixed slot 893 // for the original deopt pc. 894 895 _orig_pc_slot = fixed_slots(); 896 int next_slot = _orig_pc_slot + (sizeof(address) / VMRegImpl::stack_slot_size); 897 set_fixed_slots(next_slot); 898 899 // Compute when to use implicit null checks. Used by matching trap based 900 // nodes and NullCheck optimization. 901 set_allowed_deopt_reasons(); 902 903 // Now generate code 904 Code_Gen(); 905 if (failing()) return; 906 907 // Check if we want to skip execution of all compiled code. 908 { 909 #ifndef PRODUCT 910 if (OptoNoExecute) { 911 record_method_not_compilable("+OptoNoExecute"); // Flag as failed 912 return; 913 } 914 #endif 915 TracePhase tp("install_code", &timers[_t_registerMethod]); 916 917 if (is_osr_compilation()) { 918 _code_offsets.set_value(CodeOffsets::Verified_Entry, 0); 919 _code_offsets.set_value(CodeOffsets::OSR_Entry, _first_block_size); 920 } else { 921 _code_offsets.set_value(CodeOffsets::Verified_Entry, _first_block_size); 922 _code_offsets.set_value(CodeOffsets::OSR_Entry, 0); 923 } 924 925 env()->register_method(_method, _entry_bci, 926 &_code_offsets, 927 _orig_pc_slot_offset_in_bytes, 928 code_buffer(), 929 frame_size_in_words(), _oop_map_set, 930 &_handler_table, &_inc_table, 931 compiler, 932 has_unsafe_access(), 933 SharedRuntime::is_wide_vector(max_vector_size()), 934 rtm_state() 935 ); 936 937 if (log() != NULL) // Print code cache state into compiler log 938 log()->code_cache_state(); 939 } 940 } 941 942 //------------------------------Compile---------------------------------------- 943 // Compile a runtime stub 944 Compile::Compile( ciEnv* ci_env, 945 TypeFunc_generator generator, 946 address stub_function, 947 const char *stub_name, 948 int is_fancy_jump, 949 bool pass_tls, 950 bool save_arg_registers, 951 bool return_pc, 952 DirectiveSet* directive) 953 : Phase(Compiler), 954 _env(ci_env), 955 _directive(directive), 956 _log(ci_env->log()), 957 _compile_id(0), 958 _save_argument_registers(save_arg_registers), 959 _method(NULL), 960 _stub_name(stub_name), 961 _stub_function(stub_function), 962 _stub_entry_point(NULL), 963 _entry_bci(InvocationEntryBci), 964 _initial_gvn(NULL), 965 _for_igvn(NULL), 966 _warm_calls(NULL), 967 _orig_pc_slot(0), 968 _orig_pc_slot_offset_in_bytes(0), 969 _subsume_loads(true), 970 _do_escape_analysis(false), 971 _eliminate_boxing(false), 972 _failure_reason(NULL), 973 _code_buffer("Compile::Fill_buffer"), 974 _has_method_handle_invokes(false), 975 _mach_constant_base_node(NULL), 976 _node_bundling_limit(0), 977 _node_bundling_base(NULL), 978 _java_calls(0), 979 _inner_loops(0), 980 #ifndef PRODUCT 981 _trace_opto_output(directive->TraceOptoOutputOption), 982 _in_dump_cnt(0), 983 _printer(NULL), 984 #endif 985 _comp_arena(mtCompiler), 986 _node_arena(mtCompiler), 987 _old_arena(mtCompiler), 988 _Compile_types(mtCompiler), 989 _dead_node_list(comp_arena()), 990 _dead_node_count(0), 991 _congraph(NULL), 992 _replay_inline_data(NULL), 993 _number_of_mh_late_inlines(0), 994 _inlining_progress(false), 995 _inlining_incrementally(false), 996 _print_inlining_list(NULL), 997 _print_inlining_stream(NULL), 998 _print_inlining_idx(0), 999 _print_inlining_output(NULL), 1000 _allowed_reasons(0), 1001 _interpreter_frame_size(0), 1002 _max_node_limit(MaxNodeLimit) { 1003 C = this; 1004 1005 TraceTime t1(NULL, &_t_totalCompilation, CITime, false); 1006 TraceTime t2(NULL, &_t_stubCompilation, CITime, false); 1007 1008 #ifndef PRODUCT 1009 set_print_assembly(PrintFrameConverterAssembly); 1010 set_parsed_irreducible_loop(false); 1011 #endif 1012 set_has_irreducible_loop(false); // no loops 1013 1014 CompileWrapper cw(this); 1015 Init(/*AliasLevel=*/ 0); 1016 init_tf((*generator)()); 1017 1018 { 1019 // The following is a dummy for the sake of GraphKit::gen_stub 1020 Unique_Node_List for_igvn(comp_arena()); 1021 set_for_igvn(&for_igvn); // not used, but some GraphKit guys push on this 1022 PhaseGVN gvn(Thread::current()->resource_area(),255); 1023 set_initial_gvn(&gvn); // not significant, but GraphKit guys use it pervasively 1024 gvn.transform_no_reclaim(top()); 1025 1026 GraphKit kit; 1027 kit.gen_stub(stub_function, stub_name, is_fancy_jump, pass_tls, return_pc); 1028 } 1029 1030 NOT_PRODUCT( verify_graph_edges(); ) 1031 Code_Gen(); 1032 if (failing()) return; 1033 1034 1035 // Entry point will be accessed using compile->stub_entry_point(); 1036 if (code_buffer() == NULL) { 1037 Matcher::soft_match_failure(); 1038 } else { 1039 if (PrintAssembly && (WizardMode || Verbose)) 1040 tty->print_cr("### Stub::%s", stub_name); 1041 1042 if (!failing()) { 1043 assert(_fixed_slots == 0, "no fixed slots used for runtime stubs"); 1044 1045 // Make the NMethod 1046 // For now we mark the frame as never safe for profile stackwalking 1047 RuntimeStub *rs = RuntimeStub::new_runtime_stub(stub_name, 1048 code_buffer(), 1049 CodeOffsets::frame_never_safe, 1050 // _code_offsets.value(CodeOffsets::Frame_Complete), 1051 frame_size_in_words(), 1052 _oop_map_set, 1053 save_arg_registers); 1054 assert(rs != NULL && rs->is_runtime_stub(), "sanity check"); 1055 1056 _stub_entry_point = rs->entry_point(); 1057 } 1058 } 1059 } 1060 1061 //------------------------------Init------------------------------------------- 1062 // Prepare for a single compilation 1063 void Compile::Init(int aliaslevel) { 1064 _unique = 0; 1065 _regalloc = NULL; 1066 1067 _tf = NULL; // filled in later 1068 _top = NULL; // cached later 1069 _matcher = NULL; // filled in later 1070 _cfg = NULL; // filled in later 1071 1072 set_24_bit_selection_and_mode(Use24BitFP, false); 1073 1074 _node_note_array = NULL; 1075 _default_node_notes = NULL; 1076 DEBUG_ONLY( _modified_nodes = NULL; ) // Used in Optimize() 1077 1078 _immutable_memory = NULL; // filled in at first inquiry 1079 1080 // Globally visible Nodes 1081 // First set TOP to NULL to give safe behavior during creation of RootNode 1082 set_cached_top_node(NULL); 1083 set_root(new RootNode()); 1084 // Now that you have a Root to point to, create the real TOP 1085 set_cached_top_node( new ConNode(Type::TOP) ); 1086 set_recent_alloc(NULL, NULL); 1087 1088 // Create Debug Information Recorder to record scopes, oopmaps, etc. 1089 env()->set_oop_recorder(new OopRecorder(env()->arena())); 1090 env()->set_debug_info(new DebugInformationRecorder(env()->oop_recorder())); 1091 env()->set_dependencies(new Dependencies(env())); 1092 1093 _fixed_slots = 0; 1094 set_has_split_ifs(false); 1095 set_has_loops(has_method() && method()->has_loops()); // first approximation 1096 set_has_stringbuilder(false); 1097 set_has_boxed_value(false); 1098 _trap_can_recompile = false; // no traps emitted yet 1099 _major_progress = true; // start out assuming good things will happen 1100 set_has_unsafe_access(false); 1101 set_max_vector_size(0); 1102 Copy::zero_to_bytes(_trap_hist, sizeof(_trap_hist)); 1103 set_decompile_count(0); 1104 1105 set_do_freq_based_layout(_directive->BlockLayoutByFrequencyOption); 1106 set_num_loop_opts(LoopOptsCount); 1107 set_do_inlining(Inline); 1108 set_max_inline_size(MaxInlineSize); 1109 set_freq_inline_size(FreqInlineSize); 1110 set_do_scheduling(OptoScheduling); 1111 set_do_count_invocations(false); 1112 set_do_method_data_update(false); 1113 1114 set_do_vector_loop(false); 1115 1116 if (AllowVectorizeOnDemand) { 1117 if (has_method() && (_directive->VectorizeOption || _directive->VectorizeDebugOption)) { 1118 set_do_vector_loop(true); 1119 NOT_PRODUCT(if (do_vector_loop() && Verbose) {tty->print("Compile::Init: do vectorized loops (SIMD like) for method %s\n", method()->name()->as_quoted_ascii());}) 1120 } else if (has_method() && method()->name() != 0 && 1121 method()->intrinsic_id() == vmIntrinsics::_forEachRemaining) { 1122 set_do_vector_loop(true); 1123 } 1124 } 1125 set_use_cmove(UseCMoveUnconditionally /* || do_vector_loop()*/); //TODO: consider do_vector_loop() mandate use_cmove unconditionally 1126 NOT_PRODUCT(if (use_cmove() && Verbose && has_method()) {tty->print("Compile::Init: use CMove without profitability tests for method %s\n", method()->name()->as_quoted_ascii());}) 1127 1128 set_age_code(has_method() && method()->profile_aging()); 1129 set_rtm_state(NoRTM); // No RTM lock eliding by default 1130 _max_node_limit = _directive->MaxNodeLimitOption; 1131 1132 #if INCLUDE_RTM_OPT 1133 if (UseRTMLocking && has_method() && (method()->method_data_or_null() != NULL)) { 1134 int rtm_state = method()->method_data()->rtm_state(); 1135 if (method_has_option("NoRTMLockEliding") || ((rtm_state & NoRTM) != 0)) { 1136 // Don't generate RTM lock eliding code. 1137 set_rtm_state(NoRTM); 1138 } else if (method_has_option("UseRTMLockEliding") || ((rtm_state & UseRTM) != 0) || !UseRTMDeopt) { 1139 // Generate RTM lock eliding code without abort ratio calculation code. 1140 set_rtm_state(UseRTM); 1141 } else if (UseRTMDeopt) { 1142 // Generate RTM lock eliding code and include abort ratio calculation 1143 // code if UseRTMDeopt is on. 1144 set_rtm_state(ProfileRTM); 1145 } 1146 } 1147 #endif 1148 if (debug_info()->recording_non_safepoints()) { 1149 set_node_note_array(new(comp_arena()) GrowableArray<Node_Notes*> 1150 (comp_arena(), 8, 0, NULL)); 1151 set_default_node_notes(Node_Notes::make(this)); 1152 } 1153 1154 // // -- Initialize types before each compile -- 1155 // // Update cached type information 1156 // if( _method && _method->constants() ) 1157 // Type::update_loaded_types(_method, _method->constants()); 1158 1159 // Init alias_type map. 1160 if (!_do_escape_analysis && aliaslevel == 3) 1161 aliaslevel = 2; // No unique types without escape analysis 1162 _AliasLevel = aliaslevel; 1163 const int grow_ats = 16; 1164 _max_alias_types = grow_ats; 1165 _alias_types = NEW_ARENA_ARRAY(comp_arena(), AliasType*, grow_ats); 1166 AliasType* ats = NEW_ARENA_ARRAY(comp_arena(), AliasType, grow_ats); 1167 Copy::zero_to_bytes(ats, sizeof(AliasType)*grow_ats); 1168 { 1169 for (int i = 0; i < grow_ats; i++) _alias_types[i] = &ats[i]; 1170 } 1171 // Initialize the first few types. 1172 _alias_types[AliasIdxTop]->Init(AliasIdxTop, NULL); 1173 _alias_types[AliasIdxBot]->Init(AliasIdxBot, TypePtr::BOTTOM); 1174 _alias_types[AliasIdxRaw]->Init(AliasIdxRaw, TypeRawPtr::BOTTOM); 1175 _num_alias_types = AliasIdxRaw+1; 1176 // Zero out the alias type cache. 1177 Copy::zero_to_bytes(_alias_cache, sizeof(_alias_cache)); 1178 // A NULL adr_type hits in the cache right away. Preload the right answer. 1179 probe_alias_cache(NULL)->_index = AliasIdxTop; 1180 1181 _intrinsics = NULL; 1182 _macro_nodes = new(comp_arena()) GrowableArray<Node*>(comp_arena(), 8, 0, NULL); 1183 _predicate_opaqs = new(comp_arena()) GrowableArray<Node*>(comp_arena(), 8, 0, NULL); 1184 _expensive_nodes = new(comp_arena()) GrowableArray<Node*>(comp_arena(), 8, 0, NULL); 1185 _range_check_casts = new(comp_arena()) GrowableArray<Node*>(comp_arena(), 8, 0, NULL); 1186 _value_type_ptr_nodes = new(comp_arena()) GrowableArray<ValueTypePtrNode*>(comp_arena(), 8, 0, NULL); 1187 register_library_intrinsics(); 1188 } 1189 1190 //---------------------------init_start---------------------------------------- 1191 // Install the StartNode on this compile object. 1192 void Compile::init_start(StartNode* s) { 1193 if (failing()) 1194 return; // already failing 1195 assert(s == start(), ""); 1196 } 1197 1198 /** 1199 * Return the 'StartNode'. We must not have a pending failure, since the ideal graph 1200 * can be in an inconsistent state, i.e., we can get segmentation faults when traversing 1201 * the ideal graph. 1202 */ 1203 StartNode* Compile::start() const { 1204 assert (!failing(), "Must not have pending failure. Reason is: %s", failure_reason()); 1205 for (DUIterator_Fast imax, i = root()->fast_outs(imax); i < imax; i++) { 1206 Node* start = root()->fast_out(i); 1207 if (start->is_Start()) { 1208 return start->as_Start(); 1209 } 1210 } 1211 fatal("Did not find Start node!"); 1212 return NULL; 1213 } 1214 1215 //-------------------------------immutable_memory------------------------------------- 1216 // Access immutable memory 1217 Node* Compile::immutable_memory() { 1218 if (_immutable_memory != NULL) { 1219 return _immutable_memory; 1220 } 1221 StartNode* s = start(); 1222 for (DUIterator_Fast imax, i = s->fast_outs(imax); true; i++) { 1223 Node *p = s->fast_out(i); 1224 if (p != s && p->as_Proj()->_con == TypeFunc::Memory) { 1225 _immutable_memory = p; 1226 return _immutable_memory; 1227 } 1228 } 1229 ShouldNotReachHere(); 1230 return NULL; 1231 } 1232 1233 //----------------------set_cached_top_node------------------------------------ 1234 // Install the cached top node, and make sure Node::is_top works correctly. 1235 void Compile::set_cached_top_node(Node* tn) { 1236 if (tn != NULL) verify_top(tn); 1237 Node* old_top = _top; 1238 _top = tn; 1239 // Calling Node::setup_is_top allows the nodes the chance to adjust 1240 // their _out arrays. 1241 if (_top != NULL) _top->setup_is_top(); 1242 if (old_top != NULL) old_top->setup_is_top(); 1243 assert(_top == NULL || top()->is_top(), ""); 1244 } 1245 1246 #ifdef ASSERT 1247 uint Compile::count_live_nodes_by_graph_walk() { 1248 Unique_Node_List useful(comp_arena()); 1249 // Get useful node list by walking the graph. 1250 identify_useful_nodes(useful); 1251 return useful.size(); 1252 } 1253 1254 void Compile::print_missing_nodes() { 1255 1256 // Return if CompileLog is NULL and PrintIdealNodeCount is false. 1257 if ((_log == NULL) && (! PrintIdealNodeCount)) { 1258 return; 1259 } 1260 1261 // This is an expensive function. It is executed only when the user 1262 // specifies VerifyIdealNodeCount option or otherwise knows the 1263 // additional work that needs to be done to identify reachable nodes 1264 // by walking the flow graph and find the missing ones using 1265 // _dead_node_list. 1266 1267 Unique_Node_List useful(comp_arena()); 1268 // Get useful node list by walking the graph. 1269 identify_useful_nodes(useful); 1270 1271 uint l_nodes = C->live_nodes(); 1272 uint l_nodes_by_walk = useful.size(); 1273 1274 if (l_nodes != l_nodes_by_walk) { 1275 if (_log != NULL) { 1276 _log->begin_head("mismatched_nodes count='%d'", abs((int) (l_nodes - l_nodes_by_walk))); 1277 _log->stamp(); 1278 _log->end_head(); 1279 } 1280 VectorSet& useful_member_set = useful.member_set(); 1281 int last_idx = l_nodes_by_walk; 1282 for (int i = 0; i < last_idx; i++) { 1283 if (useful_member_set.test(i)) { 1284 if (_dead_node_list.test(i)) { 1285 if (_log != NULL) { 1286 _log->elem("mismatched_node_info node_idx='%d' type='both live and dead'", i); 1287 } 1288 if (PrintIdealNodeCount) { 1289 // Print the log message to tty 1290 tty->print_cr("mismatched_node idx='%d' both live and dead'", i); 1291 useful.at(i)->dump(); 1292 } 1293 } 1294 } 1295 else if (! _dead_node_list.test(i)) { 1296 if (_log != NULL) { 1297 _log->elem("mismatched_node_info node_idx='%d' type='neither live nor dead'", i); 1298 } 1299 if (PrintIdealNodeCount) { 1300 // Print the log message to tty 1301 tty->print_cr("mismatched_node idx='%d' type='neither live nor dead'", i); 1302 } 1303 } 1304 } 1305 if (_log != NULL) { 1306 _log->tail("mismatched_nodes"); 1307 } 1308 } 1309 } 1310 void Compile::record_modified_node(Node* n) { 1311 if (_modified_nodes != NULL && !_inlining_incrementally && 1312 n->outcnt() != 0 && !n->is_Con()) { 1313 _modified_nodes->push(n); 1314 } 1315 } 1316 1317 void Compile::remove_modified_node(Node* n) { 1318 if (_modified_nodes != NULL) { 1319 _modified_nodes->remove(n); 1320 } 1321 } 1322 #endif 1323 1324 #ifndef PRODUCT 1325 void Compile::verify_top(Node* tn) const { 1326 if (tn != NULL) { 1327 assert(tn->is_Con(), "top node must be a constant"); 1328 assert(((ConNode*)tn)->type() == Type::TOP, "top node must have correct type"); 1329 assert(tn->in(0) != NULL, "must have live top node"); 1330 } 1331 } 1332 #endif 1333 1334 1335 ///-------------------Managing Per-Node Debug & Profile Info------------------- 1336 1337 void Compile::grow_node_notes(GrowableArray<Node_Notes*>* arr, int grow_by) { 1338 guarantee(arr != NULL, ""); 1339 int num_blocks = arr->length(); 1340 if (grow_by < num_blocks) grow_by = num_blocks; 1341 int num_notes = grow_by * _node_notes_block_size; 1342 Node_Notes* notes = NEW_ARENA_ARRAY(node_arena(), Node_Notes, num_notes); 1343 Copy::zero_to_bytes(notes, num_notes * sizeof(Node_Notes)); 1344 while (num_notes > 0) { 1345 arr->append(notes); 1346 notes += _node_notes_block_size; 1347 num_notes -= _node_notes_block_size; 1348 } 1349 assert(num_notes == 0, "exact multiple, please"); 1350 } 1351 1352 bool Compile::copy_node_notes_to(Node* dest, Node* source) { 1353 if (source == NULL || dest == NULL) return false; 1354 1355 if (dest->is_Con()) 1356 return false; // Do not push debug info onto constants. 1357 1358 #ifdef ASSERT 1359 // Leave a bread crumb trail pointing to the original node: 1360 if (dest != NULL && dest != source && dest->debug_orig() == NULL) { 1361 dest->set_debug_orig(source); 1362 } 1363 #endif 1364 1365 if (node_note_array() == NULL) 1366 return false; // Not collecting any notes now. 1367 1368 // This is a copy onto a pre-existing node, which may already have notes. 1369 // If both nodes have notes, do not overwrite any pre-existing notes. 1370 Node_Notes* source_notes = node_notes_at(source->_idx); 1371 if (source_notes == NULL || source_notes->is_clear()) return false; 1372 Node_Notes* dest_notes = node_notes_at(dest->_idx); 1373 if (dest_notes == NULL || dest_notes->is_clear()) { 1374 return set_node_notes_at(dest->_idx, source_notes); 1375 } 1376 1377 Node_Notes merged_notes = (*source_notes); 1378 // The order of operations here ensures that dest notes will win... 1379 merged_notes.update_from(dest_notes); 1380 return set_node_notes_at(dest->_idx, &merged_notes); 1381 } 1382 1383 1384 //--------------------------allow_range_check_smearing------------------------- 1385 // Gating condition for coalescing similar range checks. 1386 // Sometimes we try 'speculatively' replacing a series of a range checks by a 1387 // single covering check that is at least as strong as any of them. 1388 // If the optimization succeeds, the simplified (strengthened) range check 1389 // will always succeed. If it fails, we will deopt, and then give up 1390 // on the optimization. 1391 bool Compile::allow_range_check_smearing() const { 1392 // If this method has already thrown a range-check, 1393 // assume it was because we already tried range smearing 1394 // and it failed. 1395 uint already_trapped = trap_count(Deoptimization::Reason_range_check); 1396 return !already_trapped; 1397 } 1398 1399 1400 //------------------------------flatten_alias_type----------------------------- 1401 const TypePtr *Compile::flatten_alias_type( const TypePtr *tj ) const { 1402 int offset = tj->offset(); 1403 TypePtr::PTR ptr = tj->ptr(); 1404 1405 // Known instance (scalarizable allocation) alias only with itself. 1406 bool is_known_inst = tj->isa_oopptr() != NULL && 1407 tj->is_oopptr()->is_known_instance(); 1408 1409 // Process weird unsafe references. 1410 if (offset == Type::OffsetBot && (tj->isa_instptr() /*|| tj->isa_klassptr()*/)) { 1411 assert(InlineUnsafeOps, "indeterminate pointers come only from unsafe ops"); 1412 assert(!is_known_inst, "scalarizable allocation should not have unsafe references"); 1413 tj = TypeOopPtr::BOTTOM; 1414 ptr = tj->ptr(); 1415 offset = tj->offset(); 1416 } 1417 1418 // Array pointers need some flattening 1419 const TypeAryPtr *ta = tj->isa_aryptr(); 1420 if (ta && ta->is_stable()) { 1421 // Erase stability property for alias analysis. 1422 tj = ta = ta->cast_to_stable(false); 1423 } 1424 if( ta && is_known_inst ) { 1425 if ( offset != Type::OffsetBot && 1426 offset > arrayOopDesc::length_offset_in_bytes() ) { 1427 offset = Type::OffsetBot; // Flatten constant access into array body only 1428 tj = ta = TypeAryPtr::make(ptr, ta->ary(), ta->klass(), true, Type::Offset(offset), ta->field_offset(), ta->instance_id()); 1429 } 1430 } else if( ta && _AliasLevel >= 2 ) { 1431 // For arrays indexed by constant indices, we flatten the alias 1432 // space to include all of the array body. Only the header, klass 1433 // and array length can be accessed un-aliased. 1434 // For flattened value type array, each field has its own slice so 1435 // we must include the field offset. 1436 if( offset != Type::OffsetBot ) { 1437 if( ta->const_oop() ) { // MethodData* or Method* 1438 offset = Type::OffsetBot; // Flatten constant access into array body 1439 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),ta->ary(),ta->klass(),false,Type::Offset(offset), ta->field_offset()); 1440 } else if( offset == arrayOopDesc::length_offset_in_bytes() ) { 1441 // range is OK as-is. 1442 tj = ta = TypeAryPtr::RANGE; 1443 } else if( offset == oopDesc::klass_offset_in_bytes() ) { 1444 tj = TypeInstPtr::KLASS; // all klass loads look alike 1445 ta = TypeAryPtr::RANGE; // generic ignored junk 1446 ptr = TypePtr::BotPTR; 1447 } else if( offset == oopDesc::mark_offset_in_bytes() ) { 1448 tj = TypeInstPtr::MARK; 1449 ta = TypeAryPtr::RANGE; // generic ignored junk 1450 ptr = TypePtr::BotPTR; 1451 } else { // Random constant offset into array body 1452 offset = Type::OffsetBot; // Flatten constant access into array body 1453 tj = ta = TypeAryPtr::make(ptr,ta->ary(),ta->klass(),false,Type::Offset(offset), ta->field_offset()); 1454 } 1455 } 1456 // Arrays of fixed size alias with arrays of unknown size. 1457 if (ta->size() != TypeInt::POS) { 1458 const TypeAry *tary = TypeAry::make(ta->elem(), TypeInt::POS); 1459 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,ta->klass(),false,Type::Offset(offset), ta->field_offset()); 1460 } 1461 // Arrays of known objects become arrays of unknown objects. 1462 if (ta->elem()->isa_narrowoop() && ta->elem() != TypeNarrowOop::BOTTOM) { 1463 const TypeAry *tary = TypeAry::make(TypeNarrowOop::BOTTOM, ta->size()); 1464 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,NULL,false,Type::Offset(offset), ta->field_offset()); 1465 } 1466 if (ta->elem()->isa_oopptr() && ta->elem() != TypeInstPtr::BOTTOM) { 1467 const TypeAry *tary = TypeAry::make(TypeInstPtr::BOTTOM, ta->size()); 1468 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,NULL,false,Type::Offset(offset), ta->field_offset()); 1469 } 1470 // Arrays of bytes and of booleans both use 'bastore' and 'baload' so 1471 // cannot be distinguished by bytecode alone. 1472 if (ta->elem() == TypeInt::BOOL) { 1473 const TypeAry *tary = TypeAry::make(TypeInt::BYTE, ta->size()); 1474 ciKlass* aklass = ciTypeArrayKlass::make(T_BYTE); 1475 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,aklass,false,Type::Offset(offset), ta->field_offset()); 1476 } 1477 // During the 2nd round of IterGVN, NotNull castings are removed. 1478 // Make sure the Bottom and NotNull variants alias the same. 1479 // Also, make sure exact and non-exact variants alias the same. 1480 if (ptr == TypePtr::NotNull || ta->klass_is_exact() || ta->speculative() != NULL) { 1481 tj = ta = TypeAryPtr::make(TypePtr::BotPTR,ta->ary(),ta->klass(),false,Type::Offset(offset), ta->field_offset()); 1482 } 1483 } 1484 1485 // Oop pointers need some flattening 1486 const TypeInstPtr *to = tj->isa_instptr(); 1487 if( to && _AliasLevel >= 2 && to != TypeOopPtr::BOTTOM ) { 1488 ciInstanceKlass *k = to->klass()->as_instance_klass(); 1489 if( ptr == TypePtr::Constant ) { 1490 if (to->klass() != ciEnv::current()->Class_klass() || 1491 offset < k->size_helper() * wordSize) { 1492 // No constant oop pointers (such as Strings); they alias with 1493 // unknown strings. 1494 assert(!is_known_inst, "not scalarizable allocation"); 1495 tj = to = TypeInstPtr::make(TypePtr::BotPTR,to->klass(),false,0,Type::Offset(offset)); 1496 } 1497 } else if( is_known_inst ) { 1498 tj = to; // Keep NotNull and klass_is_exact for instance type 1499 } else if( ptr == TypePtr::NotNull || to->klass_is_exact() ) { 1500 // During the 2nd round of IterGVN, NotNull castings are removed. 1501 // Make sure the Bottom and NotNull variants alias the same. 1502 // Also, make sure exact and non-exact variants alias the same. 1503 tj = to = TypeInstPtr::make(TypePtr::BotPTR,to->klass(),false,0,Type::Offset(offset)); 1504 } 1505 if (to->speculative() != NULL) { 1506 tj = to = TypeInstPtr::make(to->ptr(),to->klass(),to->klass_is_exact(),to->const_oop(),Type::Offset(to->offset()), to->instance_id()); 1507 } 1508 // Canonicalize the holder of this field 1509 if (offset >= 0 && offset < instanceOopDesc::base_offset_in_bytes()) { 1510 // First handle header references such as a LoadKlassNode, even if the 1511 // object's klass is unloaded at compile time (4965979). 1512 if (!is_known_inst) { // Do it only for non-instance types 1513 tj = to = TypeInstPtr::make(TypePtr::BotPTR, env()->Object_klass(), false, NULL, Type::Offset(offset)); 1514 } 1515 } else if (offset < 0 || offset >= k->size_helper() * wordSize) { 1516 // Static fields are in the space above the normal instance 1517 // fields in the java.lang.Class instance. 1518 if (to->klass() != ciEnv::current()->Class_klass()) { 1519 to = NULL; 1520 tj = TypeOopPtr::BOTTOM; 1521 offset = tj->offset(); 1522 } 1523 } else { 1524 ciInstanceKlass *canonical_holder = k->get_canonical_holder(offset); 1525 if (!k->equals(canonical_holder) || tj->offset() != offset) { 1526 if( is_known_inst ) { 1527 tj = to = TypeInstPtr::make(to->ptr(), canonical_holder, true, NULL, Type::Offset(offset), to->instance_id()); 1528 } else { 1529 tj = to = TypeInstPtr::make(to->ptr(), canonical_holder, false, NULL, Type::Offset(offset)); 1530 } 1531 } 1532 } 1533 } 1534 1535 // Klass pointers to object array klasses need some flattening 1536 const TypeKlassPtr *tk = tj->isa_klassptr(); 1537 if( tk ) { 1538 // If we are referencing a field within a Klass, we need 1539 // to assume the worst case of an Object. Both exact and 1540 // inexact types must flatten to the same alias class so 1541 // use NotNull as the PTR. 1542 if ( offset == Type::OffsetBot || (offset >= 0 && (size_t)offset < sizeof(Klass)) ) { 1543 1544 tj = tk = TypeKlassPtr::make(TypePtr::NotNull, 1545 TypeKlassPtr::OBJECT->klass(), 1546 Type::Offset(offset)); 1547 } 1548 1549 ciKlass* klass = tk->klass(); 1550 if (klass != NULL && klass->is_obj_array_klass()) { 1551 ciKlass* k = TypeAryPtr::OOPS->klass(); 1552 if( !k || !k->is_loaded() ) // Only fails for some -Xcomp runs 1553 k = TypeInstPtr::BOTTOM->klass(); 1554 tj = tk = TypeKlassPtr::make(TypePtr::NotNull, k, Type::Offset(offset)); 1555 } 1556 1557 // Check for precise loads from the primary supertype array and force them 1558 // to the supertype cache alias index. Check for generic array loads from 1559 // the primary supertype array and also force them to the supertype cache 1560 // alias index. Since the same load can reach both, we need to merge 1561 // these 2 disparate memories into the same alias class. Since the 1562 // primary supertype array is read-only, there's no chance of confusion 1563 // where we bypass an array load and an array store. 1564 int primary_supers_offset = in_bytes(Klass::primary_supers_offset()); 1565 if (offset == Type::OffsetBot || 1566 (offset >= primary_supers_offset && 1567 offset < (int)(primary_supers_offset + Klass::primary_super_limit() * wordSize)) || 1568 offset == (int)in_bytes(Klass::secondary_super_cache_offset())) { 1569 offset = in_bytes(Klass::secondary_super_cache_offset()); 1570 tj = tk = TypeKlassPtr::make(TypePtr::NotNull, tk->klass(), Type::Offset(offset)); 1571 } 1572 } 1573 1574 // Flatten all Raw pointers together. 1575 if (tj->base() == Type::RawPtr) 1576 tj = TypeRawPtr::BOTTOM; 1577 1578 if (tj->base() == Type::AnyPtr) 1579 tj = TypePtr::BOTTOM; // An error, which the caller must check for. 1580 1581 // Flatten all to bottom for now 1582 switch( _AliasLevel ) { 1583 case 0: 1584 tj = TypePtr::BOTTOM; 1585 break; 1586 case 1: // Flatten to: oop, static, field or array 1587 switch (tj->base()) { 1588 //case Type::AryPtr: tj = TypeAryPtr::RANGE; break; 1589 case Type::RawPtr: tj = TypeRawPtr::BOTTOM; break; 1590 case Type::AryPtr: // do not distinguish arrays at all 1591 case Type::InstPtr: tj = TypeInstPtr::BOTTOM; break; 1592 case Type::KlassPtr: tj = TypeKlassPtr::OBJECT; break; 1593 case Type::AnyPtr: tj = TypePtr::BOTTOM; break; // caller checks it 1594 default: ShouldNotReachHere(); 1595 } 1596 break; 1597 case 2: // No collapsing at level 2; keep all splits 1598 case 3: // No collapsing at level 3; keep all splits 1599 break; 1600 default: 1601 Unimplemented(); 1602 } 1603 1604 offset = tj->offset(); 1605 assert( offset != Type::OffsetTop, "Offset has fallen from constant" ); 1606 1607 assert( (offset != Type::OffsetBot && tj->base() != Type::AryPtr) || 1608 (offset == Type::OffsetBot && tj->base() == Type::AryPtr) || 1609 (offset == Type::OffsetBot && tj == TypeOopPtr::BOTTOM) || 1610 (offset == Type::OffsetBot && tj == TypePtr::BOTTOM) || 1611 (offset == oopDesc::mark_offset_in_bytes() && tj->base() == Type::AryPtr) || 1612 (offset == oopDesc::klass_offset_in_bytes() && tj->base() == Type::AryPtr) || 1613 (offset == arrayOopDesc::length_offset_in_bytes() && tj->base() == Type::AryPtr) , 1614 "For oops, klasses, raw offset must be constant; for arrays the offset is never known" ); 1615 assert( tj->ptr() != TypePtr::TopPTR && 1616 tj->ptr() != TypePtr::AnyNull && 1617 tj->ptr() != TypePtr::Null, "No imprecise addresses" ); 1618 // assert( tj->ptr() != TypePtr::Constant || 1619 // tj->base() == Type::RawPtr || 1620 // tj->base() == Type::KlassPtr, "No constant oop addresses" ); 1621 1622 return tj; 1623 } 1624 1625 void Compile::AliasType::Init(int i, const TypePtr* at) { 1626 _index = i; 1627 _adr_type = at; 1628 _field = NULL; 1629 _element = NULL; 1630 _is_rewritable = true; // default 1631 const TypeOopPtr *atoop = (at != NULL) ? at->isa_oopptr() : NULL; 1632 if (atoop != NULL && atoop->is_known_instance()) { 1633 const TypeOopPtr *gt = atoop->cast_to_instance_id(TypeOopPtr::InstanceBot); 1634 _general_index = Compile::current()->get_alias_index(gt); 1635 } else { 1636 _general_index = 0; 1637 } 1638 } 1639 1640 BasicType Compile::AliasType::basic_type() const { 1641 if (element() != NULL) { 1642 const Type* element = adr_type()->is_aryptr()->elem(); 1643 return element->isa_narrowoop() ? T_OBJECT : element->array_element_basic_type(); 1644 } if (field() != NULL) { 1645 return field()->layout_type(); 1646 } else { 1647 return T_ILLEGAL; // unknown 1648 } 1649 } 1650 1651 //---------------------------------print_on------------------------------------ 1652 #ifndef PRODUCT 1653 void Compile::AliasType::print_on(outputStream* st) { 1654 if (index() < 10) 1655 st->print("@ <%d> ", index()); 1656 else st->print("@ <%d>", index()); 1657 st->print(is_rewritable() ? " " : " RO"); 1658 int offset = adr_type()->offset(); 1659 if (offset == Type::OffsetBot) 1660 st->print(" +any"); 1661 else st->print(" +%-3d", offset); 1662 st->print(" in "); 1663 adr_type()->dump_on(st); 1664 const TypeOopPtr* tjp = adr_type()->isa_oopptr(); 1665 if (field() != NULL && tjp) { 1666 if (tjp->klass() != field()->holder() || 1667 tjp->offset() != field()->offset_in_bytes()) { 1668 st->print(" != "); 1669 field()->print(); 1670 st->print(" ***"); 1671 } 1672 } 1673 } 1674 1675 void print_alias_types() { 1676 Compile* C = Compile::current(); 1677 tty->print_cr("--- Alias types, AliasIdxBot .. %d", C->num_alias_types()-1); 1678 for (int idx = Compile::AliasIdxBot; idx < C->num_alias_types(); idx++) { 1679 C->alias_type(idx)->print_on(tty); 1680 tty->cr(); 1681 } 1682 } 1683 #endif 1684 1685 1686 //----------------------------probe_alias_cache-------------------------------- 1687 Compile::AliasCacheEntry* Compile::probe_alias_cache(const TypePtr* adr_type) { 1688 intptr_t key = (intptr_t) adr_type; 1689 key ^= key >> logAliasCacheSize; 1690 return &_alias_cache[key & right_n_bits(logAliasCacheSize)]; 1691 } 1692 1693 1694 //-----------------------------grow_alias_types-------------------------------- 1695 void Compile::grow_alias_types() { 1696 const int old_ats = _max_alias_types; // how many before? 1697 const int new_ats = old_ats; // how many more? 1698 const int grow_ats = old_ats+new_ats; // how many now? 1699 _max_alias_types = grow_ats; 1700 _alias_types = REALLOC_ARENA_ARRAY(comp_arena(), AliasType*, _alias_types, old_ats, grow_ats); 1701 AliasType* ats = NEW_ARENA_ARRAY(comp_arena(), AliasType, new_ats); 1702 Copy::zero_to_bytes(ats, sizeof(AliasType)*new_ats); 1703 for (int i = 0; i < new_ats; i++) _alias_types[old_ats+i] = &ats[i]; 1704 } 1705 1706 1707 //--------------------------------find_alias_type------------------------------ 1708 Compile::AliasType* Compile::find_alias_type(const TypePtr* adr_type, bool no_create, ciField* original_field) { 1709 if (_AliasLevel == 0) 1710 return alias_type(AliasIdxBot); 1711 1712 AliasCacheEntry* ace = probe_alias_cache(adr_type); 1713 if (ace->_adr_type == adr_type) { 1714 return alias_type(ace->_index); 1715 } 1716 1717 // Handle special cases. 1718 if (adr_type == NULL) return alias_type(AliasIdxTop); 1719 if (adr_type == TypePtr::BOTTOM) return alias_type(AliasIdxBot); 1720 1721 // Do it the slow way. 1722 const TypePtr* flat = flatten_alias_type(adr_type); 1723 1724 #ifdef ASSERT 1725 { 1726 ResourceMark rm; 1727 assert(flat == flatten_alias_type(flat), "not idempotent: adr_type = %s; flat = %s => %s", 1728 Type::str(adr_type), Type::str(flat), Type::str(flatten_alias_type(flat))); 1729 assert(flat != TypePtr::BOTTOM, "cannot alias-analyze an untyped ptr: adr_type = %s", 1730 Type::str(adr_type)); 1731 if (flat->isa_oopptr() && !flat->isa_klassptr()) { 1732 const TypeOopPtr* foop = flat->is_oopptr(); 1733 // Scalarizable allocations have exact klass always. 1734 bool exact = !foop->klass_is_exact() || foop->is_known_instance(); 1735 const TypePtr* xoop = foop->cast_to_exactness(exact)->is_ptr(); 1736 assert(foop == flatten_alias_type(xoop), "exactness must not affect alias type: foop = %s; xoop = %s", 1737 Type::str(foop), Type::str(xoop)); 1738 } 1739 } 1740 #endif 1741 1742 int idx = AliasIdxTop; 1743 for (int i = 0; i < num_alias_types(); i++) { 1744 if (alias_type(i)->adr_type() == flat) { 1745 idx = i; 1746 break; 1747 } 1748 } 1749 1750 if (idx == AliasIdxTop) { 1751 if (no_create) return NULL; 1752 // Grow the array if necessary. 1753 if (_num_alias_types == _max_alias_types) grow_alias_types(); 1754 // Add a new alias type. 1755 idx = _num_alias_types++; 1756 _alias_types[idx]->Init(idx, flat); 1757 if (flat == TypeInstPtr::KLASS) alias_type(idx)->set_rewritable(false); 1758 if (flat == TypeAryPtr::RANGE) alias_type(idx)->set_rewritable(false); 1759 if (flat->isa_instptr()) { 1760 if (flat->offset() == java_lang_Class::klass_offset_in_bytes() 1761 && flat->is_instptr()->klass() == env()->Class_klass()) 1762 alias_type(idx)->set_rewritable(false); 1763 } 1764 if (flat->isa_aryptr()) { 1765 #ifdef ASSERT 1766 const int header_size_min = arrayOopDesc::base_offset_in_bytes(T_BYTE); 1767 // (T_BYTE has the weakest alignment and size restrictions...) 1768 assert(flat->offset() < header_size_min, "array body reference must be OffsetBot"); 1769 #endif 1770 if (flat->offset() == TypePtr::OffsetBot) { 1771 alias_type(idx)->set_element(flat->is_aryptr()->elem()); 1772 } 1773 } 1774 if (flat->isa_klassptr()) { 1775 if (flat->offset() == in_bytes(Klass::super_check_offset_offset())) 1776 alias_type(idx)->set_rewritable(false); 1777 if (flat->offset() == in_bytes(Klass::modifier_flags_offset())) 1778 alias_type(idx)->set_rewritable(false); 1779 if (flat->offset() == in_bytes(Klass::access_flags_offset())) 1780 alias_type(idx)->set_rewritable(false); 1781 if (flat->offset() == in_bytes(Klass::java_mirror_offset())) 1782 alias_type(idx)->set_rewritable(false); 1783 } 1784 // %%% (We would like to finalize JavaThread::threadObj_offset(), 1785 // but the base pointer type is not distinctive enough to identify 1786 // references into JavaThread.) 1787 1788 // Check for final fields. 1789 const TypeInstPtr* tinst = flat->isa_instptr(); 1790 const TypeValueTypePtr* vtptr = flat->isa_valuetypeptr(); 1791 ciField* field = NULL; 1792 if (tinst && tinst->offset() >= instanceOopDesc::base_offset_in_bytes()) { 1793 if (tinst->const_oop() != NULL && 1794 tinst->klass() == ciEnv::current()->Class_klass() && 1795 tinst->offset() >= (tinst->klass()->as_instance_klass()->size_helper() * wordSize)) { 1796 // static field 1797 ciInstanceKlass* k = tinst->const_oop()->as_instance()->java_lang_Class_klass()->as_instance_klass(); 1798 field = k->get_field_by_offset(tinst->offset(), true); 1799 } else { 1800 ciInstanceKlass *k = tinst->klass()->as_instance_klass(); 1801 field = k->get_field_by_offset(tinst->offset(), false); 1802 } 1803 } else if (vtptr) { 1804 // Value type field 1805 ciValueKlass* vk = vtptr->klass()->as_value_klass(); 1806 field = vk->get_field_by_offset(vtptr->offset(), false); 1807 } 1808 assert(field == NULL || 1809 original_field == NULL || 1810 (field->holder() == original_field->holder() && 1811 field->offset() == original_field->offset() && 1812 field->is_static() == original_field->is_static()), "wrong field?"); 1813 // Set field() and is_rewritable() attributes. 1814 if (field != NULL) alias_type(idx)->set_field(field); 1815 } 1816 1817 // Fill the cache for next time. 1818 ace->_adr_type = adr_type; 1819 ace->_index = idx; 1820 assert(alias_type(adr_type) == alias_type(idx), "type must be installed"); 1821 1822 // Might as well try to fill the cache for the flattened version, too. 1823 AliasCacheEntry* face = probe_alias_cache(flat); 1824 if (face->_adr_type == NULL) { 1825 face->_adr_type = flat; 1826 face->_index = idx; 1827 assert(alias_type(flat) == alias_type(idx), "flat type must work too"); 1828 } 1829 1830 return alias_type(idx); 1831 } 1832 1833 1834 Compile::AliasType* Compile::alias_type(ciField* field) { 1835 const TypeOopPtr* t; 1836 if (field->is_static()) 1837 t = TypeInstPtr::make(field->holder()->java_mirror()); 1838 else 1839 t = TypeOopPtr::make_from_klass_raw(field->holder()); 1840 AliasType* atp = alias_type(t->add_offset(field->offset_in_bytes()), field); 1841 assert((field->is_final() || field->is_stable()) == !atp->is_rewritable(), "must get the rewritable bits correct"); 1842 return atp; 1843 } 1844 1845 1846 //------------------------------have_alias_type-------------------------------- 1847 bool Compile::have_alias_type(const TypePtr* adr_type) { 1848 AliasCacheEntry* ace = probe_alias_cache(adr_type); 1849 if (ace->_adr_type == adr_type) { 1850 return true; 1851 } 1852 1853 // Handle special cases. 1854 if (adr_type == NULL) return true; 1855 if (adr_type == TypePtr::BOTTOM) return true; 1856 1857 return find_alias_type(adr_type, true, NULL) != NULL; 1858 } 1859 1860 //-----------------------------must_alias-------------------------------------- 1861 // True if all values of the given address type are in the given alias category. 1862 bool Compile::must_alias(const TypePtr* adr_type, int alias_idx) { 1863 if (alias_idx == AliasIdxBot) return true; // the universal category 1864 if (adr_type == NULL) return true; // NULL serves as TypePtr::TOP 1865 if (alias_idx == AliasIdxTop) return false; // the empty category 1866 if (adr_type->base() == Type::AnyPtr) return false; // TypePtr::BOTTOM or its twins 1867 1868 // the only remaining possible overlap is identity 1869 int adr_idx = get_alias_index(adr_type); 1870 assert(adr_idx != AliasIdxBot && adr_idx != AliasIdxTop, ""); 1871 assert(adr_idx == alias_idx || 1872 (alias_type(alias_idx)->adr_type() != TypeOopPtr::BOTTOM 1873 && adr_type != TypeOopPtr::BOTTOM), 1874 "should not be testing for overlap with an unsafe pointer"); 1875 return adr_idx == alias_idx; 1876 } 1877 1878 //------------------------------can_alias-------------------------------------- 1879 // True if any values of the given address type are in the given alias category. 1880 bool Compile::can_alias(const TypePtr* adr_type, int alias_idx) { 1881 if (alias_idx == AliasIdxTop) return false; // the empty category 1882 if (adr_type == NULL) return false; // NULL serves as TypePtr::TOP 1883 if (alias_idx == AliasIdxBot) return true; // the universal category 1884 if (adr_type->base() == Type::AnyPtr) return true; // TypePtr::BOTTOM or its twins 1885 1886 // the only remaining possible overlap is identity 1887 int adr_idx = get_alias_index(adr_type); 1888 assert(adr_idx != AliasIdxBot && adr_idx != AliasIdxTop, ""); 1889 return adr_idx == alias_idx; 1890 } 1891 1892 1893 1894 //---------------------------pop_warm_call------------------------------------- 1895 WarmCallInfo* Compile::pop_warm_call() { 1896 WarmCallInfo* wci = _warm_calls; 1897 if (wci != NULL) _warm_calls = wci->remove_from(wci); 1898 return wci; 1899 } 1900 1901 //----------------------------Inline_Warm-------------------------------------- 1902 int Compile::Inline_Warm() { 1903 // If there is room, try to inline some more warm call sites. 1904 // %%% Do a graph index compaction pass when we think we're out of space? 1905 if (!InlineWarmCalls) return 0; 1906 1907 int calls_made_hot = 0; 1908 int room_to_grow = NodeCountInliningCutoff - unique(); 1909 int amount_to_grow = MIN2(room_to_grow, (int)NodeCountInliningStep); 1910 int amount_grown = 0; 1911 WarmCallInfo* call; 1912 while (amount_to_grow > 0 && (call = pop_warm_call()) != NULL) { 1913 int est_size = (int)call->size(); 1914 if (est_size > (room_to_grow - amount_grown)) { 1915 // This one won't fit anyway. Get rid of it. 1916 call->make_cold(); 1917 continue; 1918 } 1919 call->make_hot(); 1920 calls_made_hot++; 1921 amount_grown += est_size; 1922 amount_to_grow -= est_size; 1923 } 1924 1925 if (calls_made_hot > 0) set_major_progress(); 1926 return calls_made_hot; 1927 } 1928 1929 1930 //----------------------------Finish_Warm-------------------------------------- 1931 void Compile::Finish_Warm() { 1932 if (!InlineWarmCalls) return; 1933 if (failing()) return; 1934 if (warm_calls() == NULL) return; 1935 1936 // Clean up loose ends, if we are out of space for inlining. 1937 WarmCallInfo* call; 1938 while ((call = pop_warm_call()) != NULL) { 1939 call->make_cold(); 1940 } 1941 } 1942 1943 //---------------------cleanup_loop_predicates----------------------- 1944 // Remove the opaque nodes that protect the predicates so that all unused 1945 // checks and uncommon_traps will be eliminated from the ideal graph 1946 void Compile::cleanup_loop_predicates(PhaseIterGVN &igvn) { 1947 if (predicate_count()==0) return; 1948 for (int i = predicate_count(); i > 0; i--) { 1949 Node * n = predicate_opaque1_node(i-1); 1950 assert(n->Opcode() == Op_Opaque1, "must be"); 1951 igvn.replace_node(n, n->in(1)); 1952 } 1953 assert(predicate_count()==0, "should be clean!"); 1954 } 1955 1956 void Compile::add_range_check_cast(Node* n) { 1957 assert(n->isa_CastII()->has_range_check(), "CastII should have range check dependency"); 1958 assert(!_range_check_casts->contains(n), "duplicate entry in range check casts"); 1959 _range_check_casts->append(n); 1960 } 1961 1962 // Remove all range check dependent CastIINodes. 1963 void Compile::remove_range_check_casts(PhaseIterGVN &igvn) { 1964 for (int i = range_check_cast_count(); i > 0; i--) { 1965 Node* cast = range_check_cast_node(i-1); 1966 assert(cast->isa_CastII()->has_range_check(), "CastII should have range check dependency"); 1967 igvn.replace_node(cast, cast->in(1)); 1968 } 1969 assert(range_check_cast_count() == 0, "should be empty"); 1970 } 1971 1972 void Compile::add_value_type_ptr(ValueTypePtrNode* n) { 1973 assert(can_add_value_type_ptr(), "too late"); 1974 assert(!_value_type_ptr_nodes->contains(n), "duplicate entry"); 1975 _value_type_ptr_nodes->append(n); 1976 } 1977 1978 void Compile::process_value_type_ptr_nodes(PhaseIterGVN &igvn) { 1979 for (int i = value_type_ptr_count(); i > 0; i--) { 1980 ValueTypePtrNode* vtptr = value_type_ptr(i-1); 1981 // once all inlining is over otherwise debug info can get 1982 // inconsistent 1983 vtptr->make_scalar_in_safepoints(igvn.C->root(), &igvn); 1984 igvn.replace_node(vtptr, vtptr->get_oop()); 1985 } 1986 assert(value_type_ptr_count() == 0, "should be empty"); 1987 _value_type_ptr_nodes = NULL; 1988 igvn.optimize(); 1989 } 1990 1991 // StringOpts and late inlining of string methods 1992 void Compile::inline_string_calls(bool parse_time) { 1993 { 1994 // remove useless nodes to make the usage analysis simpler 1995 ResourceMark rm; 1996 PhaseRemoveUseless pru(initial_gvn(), for_igvn()); 1997 } 1998 1999 { 2000 ResourceMark rm; 2001 print_method(PHASE_BEFORE_STRINGOPTS, 3); 2002 PhaseStringOpts pso(initial_gvn(), for_igvn()); 2003 print_method(PHASE_AFTER_STRINGOPTS, 3); 2004 } 2005 2006 // now inline anything that we skipped the first time around 2007 if (!parse_time) { 2008 _late_inlines_pos = _late_inlines.length(); 2009 } 2010 2011 while (_string_late_inlines.length() > 0) { 2012 CallGenerator* cg = _string_late_inlines.pop(); 2013 cg->do_late_inline(); 2014 if (failing()) return; 2015 } 2016 _string_late_inlines.trunc_to(0); 2017 } 2018 2019 // Late inlining of boxing methods 2020 void Compile::inline_boxing_calls(PhaseIterGVN& igvn) { 2021 if (_boxing_late_inlines.length() > 0) { 2022 assert(has_boxed_value(), "inconsistent"); 2023 2024 PhaseGVN* gvn = initial_gvn(); 2025 set_inlining_incrementally(true); 2026 2027 assert( igvn._worklist.size() == 0, "should be done with igvn" ); 2028 for_igvn()->clear(); 2029 gvn->replace_with(&igvn); 2030 2031 _late_inlines_pos = _late_inlines.length(); 2032 2033 while (_boxing_late_inlines.length() > 0) { 2034 CallGenerator* cg = _boxing_late_inlines.pop(); 2035 cg->do_late_inline(); 2036 if (failing()) return; 2037 } 2038 _boxing_late_inlines.trunc_to(0); 2039 2040 { 2041 ResourceMark rm; 2042 PhaseRemoveUseless pru(gvn, for_igvn()); 2043 } 2044 2045 igvn = PhaseIterGVN(gvn); 2046 igvn.optimize(); 2047 2048 set_inlining_progress(false); 2049 set_inlining_incrementally(false); 2050 } 2051 } 2052 2053 void Compile::inline_incrementally_one(PhaseIterGVN& igvn) { 2054 assert(IncrementalInline, "incremental inlining should be on"); 2055 PhaseGVN* gvn = initial_gvn(); 2056 2057 set_inlining_progress(false); 2058 for_igvn()->clear(); 2059 gvn->replace_with(&igvn); 2060 2061 { 2062 TracePhase tp("incrementalInline_inline", &timers[_t_incrInline_inline]); 2063 int i = 0; 2064 for (; i <_late_inlines.length() && !inlining_progress(); i++) { 2065 CallGenerator* cg = _late_inlines.at(i); 2066 _late_inlines_pos = i+1; 2067 cg->do_late_inline(); 2068 if (failing()) return; 2069 } 2070 int j = 0; 2071 for (; i < _late_inlines.length(); i++, j++) { 2072 _late_inlines.at_put(j, _late_inlines.at(i)); 2073 } 2074 _late_inlines.trunc_to(j); 2075 } 2076 2077 { 2078 TracePhase tp("incrementalInline_pru", &timers[_t_incrInline_pru]); 2079 ResourceMark rm; 2080 PhaseRemoveUseless pru(gvn, for_igvn()); 2081 } 2082 2083 { 2084 TracePhase tp("incrementalInline_igvn", &timers[_t_incrInline_igvn]); 2085 igvn = PhaseIterGVN(gvn); 2086 } 2087 } 2088 2089 // Perform incremental inlining until bound on number of live nodes is reached 2090 void Compile::inline_incrementally(PhaseIterGVN& igvn) { 2091 TracePhase tp("incrementalInline", &timers[_t_incrInline]); 2092 2093 PhaseGVN* gvn = initial_gvn(); 2094 2095 set_inlining_incrementally(true); 2096 set_inlining_progress(true); 2097 uint low_live_nodes = 0; 2098 2099 while(inlining_progress() && _late_inlines.length() > 0) { 2100 2101 if (live_nodes() > (uint)LiveNodeCountInliningCutoff) { 2102 if (low_live_nodes < (uint)LiveNodeCountInliningCutoff * 8 / 10) { 2103 TracePhase tp("incrementalInline_ideal", &timers[_t_incrInline_ideal]); 2104 // PhaseIdealLoop is expensive so we only try it once we are 2105 // out of live nodes and we only try it again if the previous 2106 // helped got the number of nodes down significantly 2107 PhaseIdealLoop ideal_loop( igvn, false, true ); 2108 if (failing()) return; 2109 low_live_nodes = live_nodes(); 2110 _major_progress = true; 2111 } 2112 2113 if (live_nodes() > (uint)LiveNodeCountInliningCutoff) { 2114 break; 2115 } 2116 } 2117 2118 inline_incrementally_one(igvn); 2119 2120 if (failing()) return; 2121 2122 { 2123 TracePhase tp("incrementalInline_igvn", &timers[_t_incrInline_igvn]); 2124 igvn.optimize(); 2125 } 2126 2127 if (failing()) return; 2128 } 2129 2130 assert( igvn._worklist.size() == 0, "should be done with igvn" ); 2131 2132 if (_string_late_inlines.length() > 0) { 2133 assert(has_stringbuilder(), "inconsistent"); 2134 for_igvn()->clear(); 2135 initial_gvn()->replace_with(&igvn); 2136 2137 inline_string_calls(false); 2138 2139 if (failing()) return; 2140 2141 { 2142 TracePhase tp("incrementalInline_pru", &timers[_t_incrInline_pru]); 2143 ResourceMark rm; 2144 PhaseRemoveUseless pru(initial_gvn(), for_igvn()); 2145 } 2146 2147 { 2148 TracePhase tp("incrementalInline_igvn", &timers[_t_incrInline_igvn]); 2149 igvn = PhaseIterGVN(gvn); 2150 igvn.optimize(); 2151 } 2152 } 2153 2154 set_inlining_incrementally(false); 2155 } 2156 2157 2158 //------------------------------Optimize--------------------------------------- 2159 // Given a graph, optimize it. 2160 void Compile::Optimize() { 2161 TracePhase tp("optimizer", &timers[_t_optimizer]); 2162 2163 #ifndef PRODUCT 2164 if (_directive->BreakAtCompileOption) { 2165 BREAKPOINT; 2166 } 2167 2168 #endif 2169 2170 ResourceMark rm; 2171 int loop_opts_cnt; 2172 2173 print_inlining_reinit(); 2174 2175 NOT_PRODUCT( verify_graph_edges(); ) 2176 2177 print_method(PHASE_AFTER_PARSING); 2178 2179 { 2180 // Iterative Global Value Numbering, including ideal transforms 2181 // Initialize IterGVN with types and values from parse-time GVN 2182 PhaseIterGVN igvn(initial_gvn()); 2183 #ifdef ASSERT 2184 _modified_nodes = new (comp_arena()) Unique_Node_List(comp_arena()); 2185 #endif 2186 { 2187 TracePhase tp("iterGVN", &timers[_t_iterGVN]); 2188 igvn.optimize(); 2189 } 2190 2191 print_method(PHASE_ITER_GVN1, 2); 2192 2193 if (failing()) return; 2194 2195 inline_incrementally(igvn); 2196 2197 print_method(PHASE_INCREMENTAL_INLINE, 2); 2198 2199 if (failing()) return; 2200 2201 if (eliminate_boxing()) { 2202 // Inline valueOf() methods now. 2203 inline_boxing_calls(igvn); 2204 2205 if (AlwaysIncrementalInline) { 2206 inline_incrementally(igvn); 2207 } 2208 2209 print_method(PHASE_INCREMENTAL_BOXING_INLINE, 2); 2210 2211 if (failing()) return; 2212 } 2213 2214 // Remove the speculative part of types and clean up the graph from 2215 // the extra CastPP nodes whose only purpose is to carry them. Do 2216 // that early so that optimizations are not disrupted by the extra 2217 // CastPP nodes. 2218 remove_speculative_types(igvn); 2219 2220 // No more new expensive nodes will be added to the list from here 2221 // so keep only the actual candidates for optimizations. 2222 cleanup_expensive_nodes(igvn); 2223 2224 if (!failing() && RenumberLiveNodes && live_nodes() + NodeLimitFudgeFactor < unique()) { 2225 Compile::TracePhase tp("", &timers[_t_renumberLive]); 2226 initial_gvn()->replace_with(&igvn); 2227 for_igvn()->clear(); 2228 Unique_Node_List new_worklist(C->comp_arena()); 2229 { 2230 ResourceMark rm; 2231 PhaseRenumberLive prl = PhaseRenumberLive(initial_gvn(), for_igvn(), &new_worklist); 2232 } 2233 set_for_igvn(&new_worklist); 2234 igvn = PhaseIterGVN(initial_gvn()); 2235 igvn.optimize(); 2236 } 2237 2238 if (value_type_ptr_count() > 0) { 2239 process_value_type_ptr_nodes(igvn); 2240 } 2241 2242 // Perform escape analysis 2243 if (_do_escape_analysis && ConnectionGraph::has_candidates(this)) { 2244 if (has_loops()) { 2245 // Cleanup graph (remove dead nodes). 2246 TracePhase tp("idealLoop", &timers[_t_idealLoop]); 2247 PhaseIdealLoop ideal_loop( igvn, false, true ); 2248 if (major_progress()) print_method(PHASE_PHASEIDEAL_BEFORE_EA, 2); 2249 if (failing()) return; 2250 } 2251 ConnectionGraph::do_analysis(this, &igvn); 2252 2253 if (failing()) return; 2254 2255 // Optimize out fields loads from scalar replaceable allocations. 2256 igvn.optimize(); 2257 print_method(PHASE_ITER_GVN_AFTER_EA, 2); 2258 2259 if (failing()) return; 2260 2261 if (congraph() != NULL && macro_count() > 0) { 2262 TracePhase tp("macroEliminate", &timers[_t_macroEliminate]); 2263 PhaseMacroExpand mexp(igvn); 2264 mexp.eliminate_macro_nodes(); 2265 igvn.set_delay_transform(false); 2266 2267 igvn.optimize(); 2268 print_method(PHASE_ITER_GVN_AFTER_ELIMINATION, 2); 2269 2270 if (failing()) return; 2271 } 2272 } 2273 2274 // Loop transforms on the ideal graph. Range Check Elimination, 2275 // peeling, unrolling, etc. 2276 2277 // Set loop opts counter 2278 loop_opts_cnt = num_loop_opts(); 2279 if((loop_opts_cnt > 0) && (has_loops() || has_split_ifs())) { 2280 { 2281 TracePhase tp("idealLoop", &timers[_t_idealLoop]); 2282 PhaseIdealLoop ideal_loop( igvn, true ); 2283 loop_opts_cnt--; 2284 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP1, 2); 2285 if (failing()) return; 2286 } 2287 // Loop opts pass if partial peeling occurred in previous pass 2288 if(PartialPeelLoop && major_progress() && (loop_opts_cnt > 0)) { 2289 TracePhase tp("idealLoop", &timers[_t_idealLoop]); 2290 PhaseIdealLoop ideal_loop( igvn, false ); 2291 loop_opts_cnt--; 2292 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP2, 2); 2293 if (failing()) return; 2294 } 2295 // Loop opts pass for loop-unrolling before CCP 2296 if(major_progress() && (loop_opts_cnt > 0)) { 2297 TracePhase tp("idealLoop", &timers[_t_idealLoop]); 2298 PhaseIdealLoop ideal_loop( igvn, false ); 2299 loop_opts_cnt--; 2300 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP3, 2); 2301 } 2302 if (!failing()) { 2303 // Verify that last round of loop opts produced a valid graph 2304 TracePhase tp("idealLoopVerify", &timers[_t_idealLoopVerify]); 2305 PhaseIdealLoop::verify(igvn); 2306 } 2307 } 2308 if (failing()) return; 2309 2310 // Conditional Constant Propagation; 2311 PhaseCCP ccp( &igvn ); 2312 assert( true, "Break here to ccp.dump_nodes_and_types(_root,999,1)"); 2313 { 2314 TracePhase tp("ccp", &timers[_t_ccp]); 2315 ccp.do_transform(); 2316 } 2317 print_method(PHASE_CPP1, 2); 2318 2319 assert( true, "Break here to ccp.dump_old2new_map()"); 2320 2321 // Iterative Global Value Numbering, including ideal transforms 2322 { 2323 TracePhase tp("iterGVN2", &timers[_t_iterGVN2]); 2324 igvn = ccp; 2325 igvn.optimize(); 2326 } 2327 2328 print_method(PHASE_ITER_GVN2, 2); 2329 2330 if (failing()) return; 2331 2332 // Loop transforms on the ideal graph. Range Check Elimination, 2333 // peeling, unrolling, etc. 2334 if(loop_opts_cnt > 0) { 2335 debug_only( int cnt = 0; ); 2336 while(major_progress() && (loop_opts_cnt > 0)) { 2337 TracePhase tp("idealLoop", &timers[_t_idealLoop]); 2338 assert( cnt++ < 40, "infinite cycle in loop optimization" ); 2339 PhaseIdealLoop ideal_loop( igvn, true); 2340 loop_opts_cnt--; 2341 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP_ITERATIONS, 2); 2342 if (failing()) return; 2343 } 2344 } 2345 // Ensure that major progress is now clear 2346 C->clear_major_progress(); 2347 2348 { 2349 // Verify that all previous optimizations produced a valid graph 2350 // at least to this point, even if no loop optimizations were done. 2351 TracePhase tp("idealLoopVerify", &timers[_t_idealLoopVerify]); 2352 PhaseIdealLoop::verify(igvn); 2353 } 2354 2355 if (range_check_cast_count() > 0) { 2356 // No more loop optimizations. Remove all range check dependent CastIINodes. 2357 C->remove_range_check_casts(igvn); 2358 igvn.optimize(); 2359 } 2360 2361 { 2362 TracePhase tp("macroExpand", &timers[_t_macroExpand]); 2363 PhaseMacroExpand mex(igvn); 2364 if (mex.expand_macro_nodes()) { 2365 assert(failing(), "must bail out w/ explicit message"); 2366 return; 2367 } 2368 } 2369 2370 DEBUG_ONLY( _modified_nodes = NULL; ) 2371 } // (End scope of igvn; run destructor if necessary for asserts.) 2372 2373 process_print_inlining(); 2374 // A method with only infinite loops has no edges entering loops from root 2375 { 2376 TracePhase tp("graphReshape", &timers[_t_graphReshaping]); 2377 if (final_graph_reshaping()) { 2378 assert(failing(), "must bail out w/ explicit message"); 2379 return; 2380 } 2381 } 2382 2383 print_method(PHASE_OPTIMIZE_FINISHED, 2); 2384 } 2385 2386 // Fixme remove 2387 static void check_for_value_node(Node &n, void* C) { 2388 if (n.is_ValueType()) { 2389 #ifdef ASSERT 2390 ((Compile*)C)->method()->print_short_name(); 2391 tty->print_cr(""); 2392 n.dump(-1); 2393 assert(false, "Unable to match ValueTypeNode"); 2394 #endif 2395 ((Compile*)C)->record_failure("Unable to match ValueTypeNode"); 2396 } 2397 } 2398 2399 //------------------------------Code_Gen--------------------------------------- 2400 // Given a graph, generate code for it 2401 void Compile::Code_Gen() { 2402 // FIXME remove 2403 root()->walk(Node::nop, check_for_value_node, this); 2404 2405 if (failing()) { 2406 return; 2407 } 2408 2409 // Perform instruction selection. You might think we could reclaim Matcher 2410 // memory PDQ, but actually the Matcher is used in generating spill code. 2411 // Internals of the Matcher (including some VectorSets) must remain live 2412 // for awhile - thus I cannot reclaim Matcher memory lest a VectorSet usage 2413 // set a bit in reclaimed memory. 2414 2415 // In debug mode can dump m._nodes.dump() for mapping of ideal to machine 2416 // nodes. Mapping is only valid at the root of each matched subtree. 2417 NOT_PRODUCT( verify_graph_edges(); ) 2418 2419 Matcher matcher; 2420 _matcher = &matcher; 2421 { 2422 TracePhase tp("matcher", &timers[_t_matcher]); 2423 matcher.match(); 2424 } 2425 // In debug mode can dump m._nodes.dump() for mapping of ideal to machine 2426 // nodes. Mapping is only valid at the root of each matched subtree. 2427 NOT_PRODUCT( verify_graph_edges(); ) 2428 2429 // If you have too many nodes, or if matching has failed, bail out 2430 check_node_count(0, "out of nodes matching instructions"); 2431 if (failing()) { 2432 return; 2433 } 2434 2435 // Build a proper-looking CFG 2436 PhaseCFG cfg(node_arena(), root(), matcher); 2437 _cfg = &cfg; 2438 { 2439 TracePhase tp("scheduler", &timers[_t_scheduler]); 2440 bool success = cfg.do_global_code_motion(); 2441 if (!success) { 2442 return; 2443 } 2444 2445 print_method(PHASE_GLOBAL_CODE_MOTION, 2); 2446 NOT_PRODUCT( verify_graph_edges(); ) 2447 debug_only( cfg.verify(); ) 2448 } 2449 2450 PhaseChaitin regalloc(unique(), cfg, matcher, false); 2451 _regalloc = ®alloc; 2452 { 2453 TracePhase tp("regalloc", &timers[_t_registerAllocation]); 2454 // Perform register allocation. After Chaitin, use-def chains are 2455 // no longer accurate (at spill code) and so must be ignored. 2456 // Node->LRG->reg mappings are still accurate. 2457 _regalloc->Register_Allocate(); 2458 2459 // Bail out if the allocator builds too many nodes 2460 if (failing()) { 2461 return; 2462 } 2463 } 2464 2465 // Prior to register allocation we kept empty basic blocks in case the 2466 // the allocator needed a place to spill. After register allocation we 2467 // are not adding any new instructions. If any basic block is empty, we 2468 // can now safely remove it. 2469 { 2470 TracePhase tp("blockOrdering", &timers[_t_blockOrdering]); 2471 cfg.remove_empty_blocks(); 2472 if (do_freq_based_layout()) { 2473 PhaseBlockLayout layout(cfg); 2474 } else { 2475 cfg.set_loop_alignment(); 2476 } 2477 cfg.fixup_flow(); 2478 } 2479 2480 // Apply peephole optimizations 2481 if( OptoPeephole ) { 2482 TracePhase tp("peephole", &timers[_t_peephole]); 2483 PhasePeephole peep( _regalloc, cfg); 2484 peep.do_transform(); 2485 } 2486 2487 // Do late expand if CPU requires this. 2488 if (Matcher::require_postalloc_expand) { 2489 TracePhase tp("postalloc_expand", &timers[_t_postalloc_expand]); 2490 cfg.postalloc_expand(_regalloc); 2491 } 2492 2493 // Convert Nodes to instruction bits in a buffer 2494 { 2495 TraceTime tp("output", &timers[_t_output], CITime); 2496 Output(); 2497 } 2498 2499 print_method(PHASE_FINAL_CODE); 2500 2501 // He's dead, Jim. 2502 _cfg = (PhaseCFG*)0xdeadbeef; 2503 _regalloc = (PhaseChaitin*)0xdeadbeef; 2504 } 2505 2506 2507 //------------------------------dump_asm--------------------------------------- 2508 // Dump formatted assembly 2509 #ifndef PRODUCT 2510 void Compile::dump_asm(int *pcs, uint pc_limit) { 2511 bool cut_short = false; 2512 tty->print_cr("#"); 2513 tty->print("# "); _tf->dump(); tty->cr(); 2514 tty->print_cr("#"); 2515 2516 // For all blocks 2517 int pc = 0x0; // Program counter 2518 char starts_bundle = ' '; 2519 _regalloc->dump_frame(); 2520 2521 Node *n = NULL; 2522 for (uint i = 0; i < _cfg->number_of_blocks(); i++) { 2523 if (VMThread::should_terminate()) { 2524 cut_short = true; 2525 break; 2526 } 2527 Block* block = _cfg->get_block(i); 2528 if (block->is_connector() && !Verbose) { 2529 continue; 2530 } 2531 n = block->head(); 2532 if (pcs && n->_idx < pc_limit) { 2533 tty->print("%3.3x ", pcs[n->_idx]); 2534 } else { 2535 tty->print(" "); 2536 } 2537 block->dump_head(_cfg); 2538 if (block->is_connector()) { 2539 tty->print_cr(" # Empty connector block"); 2540 } else if (block->num_preds() == 2 && block->pred(1)->is_CatchProj() && block->pred(1)->as_CatchProj()->_con == CatchProjNode::fall_through_index) { 2541 tty->print_cr(" # Block is sole successor of call"); 2542 } 2543 2544 // For all instructions 2545 Node *delay = NULL; 2546 for (uint j = 0; j < block->number_of_nodes(); j++) { 2547 if (VMThread::should_terminate()) { 2548 cut_short = true; 2549 break; 2550 } 2551 n = block->get_node(j); 2552 if (valid_bundle_info(n)) { 2553 Bundle* bundle = node_bundling(n); 2554 if (bundle->used_in_unconditional_delay()) { 2555 delay = n; 2556 continue; 2557 } 2558 if (bundle->starts_bundle()) { 2559 starts_bundle = '+'; 2560 } 2561 } 2562 2563 if (WizardMode) { 2564 n->dump(); 2565 } 2566 2567 if( !n->is_Region() && // Dont print in the Assembly 2568 !n->is_Phi() && // a few noisely useless nodes 2569 !n->is_Proj() && 2570 !n->is_MachTemp() && 2571 !n->is_SafePointScalarObject() && 2572 !n->is_Catch() && // Would be nice to print exception table targets 2573 !n->is_MergeMem() && // Not very interesting 2574 !n->is_top() && // Debug info table constants 2575 !(n->is_Con() && !n->is_Mach())// Debug info table constants 2576 ) { 2577 if (pcs && n->_idx < pc_limit) 2578 tty->print("%3.3x", pcs[n->_idx]); 2579 else 2580 tty->print(" "); 2581 tty->print(" %c ", starts_bundle); 2582 starts_bundle = ' '; 2583 tty->print("\t"); 2584 n->format(_regalloc, tty); 2585 tty->cr(); 2586 } 2587 2588 // If we have an instruction with a delay slot, and have seen a delay, 2589 // then back up and print it 2590 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) { 2591 assert(delay != NULL, "no unconditional delay instruction"); 2592 if (WizardMode) delay->dump(); 2593 2594 if (node_bundling(delay)->starts_bundle()) 2595 starts_bundle = '+'; 2596 if (pcs && n->_idx < pc_limit) 2597 tty->print("%3.3x", pcs[n->_idx]); 2598 else 2599 tty->print(" "); 2600 tty->print(" %c ", starts_bundle); 2601 starts_bundle = ' '; 2602 tty->print("\t"); 2603 delay->format(_regalloc, tty); 2604 tty->cr(); 2605 delay = NULL; 2606 } 2607 2608 // Dump the exception table as well 2609 if( n->is_Catch() && (Verbose || WizardMode) ) { 2610 // Print the exception table for this offset 2611 _handler_table.print_subtable_for(pc); 2612 } 2613 } 2614 2615 if (pcs && n->_idx < pc_limit) 2616 tty->print_cr("%3.3x", pcs[n->_idx]); 2617 else 2618 tty->cr(); 2619 2620 assert(cut_short || delay == NULL, "no unconditional delay branch"); 2621 2622 } // End of per-block dump 2623 tty->cr(); 2624 2625 if (cut_short) tty->print_cr("*** disassembly is cut short ***"); 2626 } 2627 #endif 2628 2629 //------------------------------Final_Reshape_Counts--------------------------- 2630 // This class defines counters to help identify when a method 2631 // may/must be executed using hardware with only 24-bit precision. 2632 struct Final_Reshape_Counts : public StackObj { 2633 int _call_count; // count non-inlined 'common' calls 2634 int _float_count; // count float ops requiring 24-bit precision 2635 int _double_count; // count double ops requiring more precision 2636 int _java_call_count; // count non-inlined 'java' calls 2637 int _inner_loop_count; // count loops which need alignment 2638 VectorSet _visited; // Visitation flags 2639 Node_List _tests; // Set of IfNodes & PCTableNodes 2640 2641 Final_Reshape_Counts() : 2642 _call_count(0), _float_count(0), _double_count(0), 2643 _java_call_count(0), _inner_loop_count(0), 2644 _visited( Thread::current()->resource_area() ) { } 2645 2646 void inc_call_count () { _call_count ++; } 2647 void inc_float_count () { _float_count ++; } 2648 void inc_double_count() { _double_count++; } 2649 void inc_java_call_count() { _java_call_count++; } 2650 void inc_inner_loop_count() { _inner_loop_count++; } 2651 2652 int get_call_count () const { return _call_count ; } 2653 int get_float_count () const { return _float_count ; } 2654 int get_double_count() const { return _double_count; } 2655 int get_java_call_count() const { return _java_call_count; } 2656 int get_inner_loop_count() const { return _inner_loop_count; } 2657 }; 2658 2659 #ifdef ASSERT 2660 static bool oop_offset_is_sane(const TypeInstPtr* tp) { 2661 ciInstanceKlass *k = tp->klass()->as_instance_klass(); 2662 // Make sure the offset goes inside the instance layout. 2663 return k->contains_field_offset(tp->offset()); 2664 // Note that OffsetBot and OffsetTop are very negative. 2665 } 2666 #endif 2667 2668 // Eliminate trivially redundant StoreCMs and accumulate their 2669 // precedence edges. 2670 void Compile::eliminate_redundant_card_marks(Node* n) { 2671 assert(n->Opcode() == Op_StoreCM, "expected StoreCM"); 2672 if (n->in(MemNode::Address)->outcnt() > 1) { 2673 // There are multiple users of the same address so it might be 2674 // possible to eliminate some of the StoreCMs 2675 Node* mem = n->in(MemNode::Memory); 2676 Node* adr = n->in(MemNode::Address); 2677 Node* val = n->in(MemNode::ValueIn); 2678 Node* prev = n; 2679 bool done = false; 2680 // Walk the chain of StoreCMs eliminating ones that match. As 2681 // long as it's a chain of single users then the optimization is 2682 // safe. Eliminating partially redundant StoreCMs would require 2683 // cloning copies down the other paths. 2684 while (mem->Opcode() == Op_StoreCM && mem->outcnt() == 1 && !done) { 2685 if (adr == mem->in(MemNode::Address) && 2686 val == mem->in(MemNode::ValueIn)) { 2687 // redundant StoreCM 2688 if (mem->req() > MemNode::OopStore) { 2689 // Hasn't been processed by this code yet. 2690 n->add_prec(mem->in(MemNode::OopStore)); 2691 } else { 2692 // Already converted to precedence edge 2693 for (uint i = mem->req(); i < mem->len(); i++) { 2694 // Accumulate any precedence edges 2695 if (mem->in(i) != NULL) { 2696 n->add_prec(mem->in(i)); 2697 } 2698 } 2699 // Everything above this point has been processed. 2700 done = true; 2701 } 2702 // Eliminate the previous StoreCM 2703 prev->set_req(MemNode::Memory, mem->in(MemNode::Memory)); 2704 assert(mem->outcnt() == 0, "should be dead"); 2705 mem->disconnect_inputs(NULL, this); 2706 } else { 2707 prev = mem; 2708 } 2709 mem = prev->in(MemNode::Memory); 2710 } 2711 } 2712 } 2713 2714 2715 //------------------------------final_graph_reshaping_impl---------------------- 2716 // Implement items 1-5 from final_graph_reshaping below. 2717 void Compile::final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc) { 2718 2719 if ( n->outcnt() == 0 ) return; // dead node 2720 uint nop = n->Opcode(); 2721 2722 // Check for 2-input instruction with "last use" on right input. 2723 // Swap to left input. Implements item (2). 2724 if( n->req() == 3 && // two-input instruction 2725 n->in(1)->outcnt() > 1 && // left use is NOT a last use 2726 (!n->in(1)->is_Phi() || n->in(1)->in(2) != n) && // it is not data loop 2727 n->in(2)->outcnt() == 1 &&// right use IS a last use 2728 !n->in(2)->is_Con() ) { // right use is not a constant 2729 // Check for commutative opcode 2730 switch( nop ) { 2731 case Op_AddI: case Op_AddF: case Op_AddD: case Op_AddL: 2732 case Op_MaxI: case Op_MinI: 2733 case Op_MulI: case Op_MulF: case Op_MulD: case Op_MulL: 2734 case Op_AndL: case Op_XorL: case Op_OrL: 2735 case Op_AndI: case Op_XorI: case Op_OrI: { 2736 // Move "last use" input to left by swapping inputs 2737 n->swap_edges(1, 2); 2738 break; 2739 } 2740 default: 2741 break; 2742 } 2743 } 2744 2745 #ifdef ASSERT 2746 if( n->is_Mem() ) { 2747 int alias_idx = get_alias_index(n->as_Mem()->adr_type()); 2748 assert( n->in(0) != NULL || alias_idx != Compile::AliasIdxRaw || 2749 // oop will be recorded in oop map if load crosses safepoint 2750 n->is_Load() && (n->as_Load()->bottom_type()->isa_oopptr() || 2751 LoadNode::is_immutable_value(n->in(MemNode::Address))), 2752 "raw memory operations should have control edge"); 2753 } 2754 #endif 2755 // Count FPU ops and common calls, implements item (3) 2756 switch( nop ) { 2757 // Count all float operations that may use FPU 2758 case Op_AddF: 2759 case Op_SubF: 2760 case Op_MulF: 2761 case Op_DivF: 2762 case Op_NegF: 2763 case Op_ModF: 2764 case Op_ConvI2F: 2765 case Op_ConF: 2766 case Op_CmpF: 2767 case Op_CmpF3: 2768 // case Op_ConvL2F: // longs are split into 32-bit halves 2769 frc.inc_float_count(); 2770 break; 2771 2772 case Op_ConvF2D: 2773 case Op_ConvD2F: 2774 frc.inc_float_count(); 2775 frc.inc_double_count(); 2776 break; 2777 2778 // Count all double operations that may use FPU 2779 case Op_AddD: 2780 case Op_SubD: 2781 case Op_MulD: 2782 case Op_DivD: 2783 case Op_NegD: 2784 case Op_ModD: 2785 case Op_ConvI2D: 2786 case Op_ConvD2I: 2787 // case Op_ConvL2D: // handled by leaf call 2788 // case Op_ConvD2L: // handled by leaf call 2789 case Op_ConD: 2790 case Op_CmpD: 2791 case Op_CmpD3: 2792 frc.inc_double_count(); 2793 break; 2794 case Op_Opaque1: // Remove Opaque Nodes before matching 2795 case Op_Opaque2: // Remove Opaque Nodes before matching 2796 case Op_Opaque3: 2797 n->subsume_by(n->in(1), this); 2798 break; 2799 case Op_CallStaticJava: 2800 case Op_CallJava: 2801 case Op_CallDynamicJava: 2802 frc.inc_java_call_count(); // Count java call site; 2803 case Op_CallRuntime: 2804 case Op_CallLeaf: 2805 case Op_CallLeafNoFP: { 2806 assert( n->is_Call(), "" ); 2807 CallNode *call = n->as_Call(); 2808 // Count call sites where the FP mode bit would have to be flipped. 2809 // Do not count uncommon runtime calls: 2810 // uncommon_trap, _complete_monitor_locking, _complete_monitor_unlocking, 2811 // _new_Java, _new_typeArray, _new_objArray, _rethrow_Java, ... 2812 if( !call->is_CallStaticJava() || !call->as_CallStaticJava()->_name ) { 2813 frc.inc_call_count(); // Count the call site 2814 } else { // See if uncommon argument is shared 2815 Node *n = call->in(TypeFunc::Parms); 2816 int nop = n->Opcode(); 2817 // Clone shared simple arguments to uncommon calls, item (1). 2818 if( n->outcnt() > 1 && 2819 !n->is_Proj() && 2820 nop != Op_CreateEx && 2821 nop != Op_CheckCastPP && 2822 nop != Op_DecodeN && 2823 nop != Op_DecodeNKlass && 2824 !n->is_Mem() ) { 2825 Node *x = n->clone(); 2826 call->set_req( TypeFunc::Parms, x ); 2827 } 2828 } 2829 break; 2830 } 2831 2832 case Op_StoreD: 2833 case Op_LoadD: 2834 case Op_LoadD_unaligned: 2835 frc.inc_double_count(); 2836 goto handle_mem; 2837 case Op_StoreF: 2838 case Op_LoadF: 2839 frc.inc_float_count(); 2840 goto handle_mem; 2841 2842 case Op_StoreCM: 2843 { 2844 // Convert OopStore dependence into precedence edge 2845 Node* prec = n->in(MemNode::OopStore); 2846 n->del_req(MemNode::OopStore); 2847 n->add_prec(prec); 2848 eliminate_redundant_card_marks(n); 2849 } 2850 2851 // fall through 2852 2853 case Op_StoreB: 2854 case Op_StoreC: 2855 case Op_StorePConditional: 2856 case Op_StoreI: 2857 case Op_StoreL: 2858 case Op_StoreIConditional: 2859 case Op_StoreLConditional: 2860 case Op_CompareAndSwapB: 2861 case Op_CompareAndSwapS: 2862 case Op_CompareAndSwapI: 2863 case Op_CompareAndSwapL: 2864 case Op_CompareAndSwapP: 2865 case Op_CompareAndSwapN: 2866 case Op_WeakCompareAndSwapB: 2867 case Op_WeakCompareAndSwapS: 2868 case Op_WeakCompareAndSwapI: 2869 case Op_WeakCompareAndSwapL: 2870 case Op_WeakCompareAndSwapP: 2871 case Op_WeakCompareAndSwapN: 2872 case Op_CompareAndExchangeB: 2873 case Op_CompareAndExchangeS: 2874 case Op_CompareAndExchangeI: 2875 case Op_CompareAndExchangeL: 2876 case Op_CompareAndExchangeP: 2877 case Op_CompareAndExchangeN: 2878 case Op_GetAndAddS: 2879 case Op_GetAndAddB: 2880 case Op_GetAndAddI: 2881 case Op_GetAndAddL: 2882 case Op_GetAndSetS: 2883 case Op_GetAndSetB: 2884 case Op_GetAndSetI: 2885 case Op_GetAndSetL: 2886 case Op_GetAndSetP: 2887 case Op_GetAndSetN: 2888 case Op_StoreP: 2889 case Op_StoreN: 2890 case Op_StoreNKlass: 2891 case Op_LoadB: 2892 case Op_LoadUB: 2893 case Op_LoadUS: 2894 case Op_LoadI: 2895 case Op_LoadKlass: 2896 case Op_LoadNKlass: 2897 case Op_LoadL: 2898 case Op_LoadL_unaligned: 2899 case Op_LoadPLocked: 2900 case Op_LoadP: 2901 case Op_LoadN: 2902 case Op_LoadRange: 2903 case Op_LoadS: { 2904 handle_mem: 2905 #ifdef ASSERT 2906 if( VerifyOptoOopOffsets ) { 2907 assert( n->is_Mem(), "" ); 2908 MemNode *mem = (MemNode*)n; 2909 // Check to see if address types have grounded out somehow. 2910 const TypeInstPtr *tp = mem->in(MemNode::Address)->bottom_type()->isa_instptr(); 2911 assert( !tp || oop_offset_is_sane(tp), "" ); 2912 } 2913 #endif 2914 break; 2915 } 2916 2917 case Op_AddP: { // Assert sane base pointers 2918 Node *addp = n->in(AddPNode::Address); 2919 assert( !addp->is_AddP() || 2920 addp->in(AddPNode::Base)->is_top() || // Top OK for allocation 2921 addp->in(AddPNode::Base) == n->in(AddPNode::Base), 2922 "Base pointers must match (addp %u)", addp->_idx ); 2923 #ifdef _LP64 2924 if ((UseCompressedOops || UseCompressedClassPointers) && 2925 addp->Opcode() == Op_ConP && 2926 addp == n->in(AddPNode::Base) && 2927 n->in(AddPNode::Offset)->is_Con()) { 2928 // If the transformation of ConP to ConN+DecodeN is beneficial depends 2929 // on the platform and on the compressed oops mode. 2930 // Use addressing with narrow klass to load with offset on x86. 2931 // Some platforms can use the constant pool to load ConP. 2932 // Do this transformation here since IGVN will convert ConN back to ConP. 2933 const Type* t = addp->bottom_type(); 2934 bool is_oop = t->isa_oopptr() != NULL; 2935 bool is_klass = t->isa_klassptr() != NULL; 2936 2937 if ((is_oop && Matcher::const_oop_prefer_decode() ) || 2938 (is_klass && Matcher::const_klass_prefer_decode())) { 2939 Node* nn = NULL; 2940 2941 int op = is_oop ? Op_ConN : Op_ConNKlass; 2942 2943 // Look for existing ConN node of the same exact type. 2944 Node* r = root(); 2945 uint cnt = r->outcnt(); 2946 for (uint i = 0; i < cnt; i++) { 2947 Node* m = r->raw_out(i); 2948 if (m!= NULL && m->Opcode() == op && 2949 m->bottom_type()->make_ptr() == t) { 2950 nn = m; 2951 break; 2952 } 2953 } 2954 if (nn != NULL) { 2955 // Decode a narrow oop to match address 2956 // [R12 + narrow_oop_reg<<3 + offset] 2957 if (is_oop) { 2958 nn = new DecodeNNode(nn, t); 2959 } else { 2960 nn = new DecodeNKlassNode(nn, t); 2961 } 2962 // Check for succeeding AddP which uses the same Base. 2963 // Otherwise we will run into the assertion above when visiting that guy. 2964 for (uint i = 0; i < n->outcnt(); ++i) { 2965 Node *out_i = n->raw_out(i); 2966 if (out_i && out_i->is_AddP() && out_i->in(AddPNode::Base) == addp) { 2967 out_i->set_req(AddPNode::Base, nn); 2968 #ifdef ASSERT 2969 for (uint j = 0; j < out_i->outcnt(); ++j) { 2970 Node *out_j = out_i->raw_out(j); 2971 assert(out_j == NULL || !out_j->is_AddP() || out_j->in(AddPNode::Base) != addp, 2972 "more than 2 AddP nodes in a chain (out_j %u)", out_j->_idx); 2973 } 2974 #endif 2975 } 2976 } 2977 n->set_req(AddPNode::Base, nn); 2978 n->set_req(AddPNode::Address, nn); 2979 if (addp->outcnt() == 0) { 2980 addp->disconnect_inputs(NULL, this); 2981 } 2982 } 2983 } 2984 } 2985 #endif 2986 // platform dependent reshaping of the address expression 2987 reshape_address(n->as_AddP()); 2988 break; 2989 } 2990 2991 case Op_CastPP: { 2992 // Remove CastPP nodes to gain more freedom during scheduling but 2993 // keep the dependency they encode as control or precedence edges 2994 // (if control is set already) on memory operations. Some CastPP 2995 // nodes don't have a control (don't carry a dependency): skip 2996 // those. 2997 if (n->in(0) != NULL) { 2998 ResourceMark rm; 2999 Unique_Node_List wq; 3000 wq.push(n); 3001 for (uint next = 0; next < wq.size(); ++next) { 3002 Node *m = wq.at(next); 3003 for (DUIterator_Fast imax, i = m->fast_outs(imax); i < imax; i++) { 3004 Node* use = m->fast_out(i); 3005 if (use->is_Mem() || use->is_EncodeNarrowPtr()) { 3006 use->ensure_control_or_add_prec(n->in(0)); 3007 } else { 3008 switch(use->Opcode()) { 3009 case Op_AddP: 3010 case Op_DecodeN: 3011 case Op_DecodeNKlass: 3012 case Op_CheckCastPP: 3013 case Op_CastPP: 3014 wq.push(use); 3015 break; 3016 } 3017 } 3018 } 3019 } 3020 } 3021 const bool is_LP64 = LP64_ONLY(true) NOT_LP64(false); 3022 if (is_LP64 && n->in(1)->is_DecodeN() && Matcher::gen_narrow_oop_implicit_null_checks()) { 3023 Node* in1 = n->in(1); 3024 const Type* t = n->bottom_type(); 3025 Node* new_in1 = in1->clone(); 3026 new_in1->as_DecodeN()->set_type(t); 3027 3028 if (!Matcher::narrow_oop_use_complex_address()) { 3029 // 3030 // x86, ARM and friends can handle 2 adds in addressing mode 3031 // and Matcher can fold a DecodeN node into address by using 3032 // a narrow oop directly and do implicit NULL check in address: 3033 // 3034 // [R12 + narrow_oop_reg<<3 + offset] 3035 // NullCheck narrow_oop_reg 3036 // 3037 // On other platforms (Sparc) we have to keep new DecodeN node and 3038 // use it to do implicit NULL check in address: 3039 // 3040 // decode_not_null narrow_oop_reg, base_reg 3041 // [base_reg + offset] 3042 // NullCheck base_reg 3043 // 3044 // Pin the new DecodeN node to non-null path on these platform (Sparc) 3045 // to keep the information to which NULL check the new DecodeN node 3046 // corresponds to use it as value in implicit_null_check(). 3047 // 3048 new_in1->set_req(0, n->in(0)); 3049 } 3050 3051 n->subsume_by(new_in1, this); 3052 if (in1->outcnt() == 0) { 3053 in1->disconnect_inputs(NULL, this); 3054 } 3055 } else { 3056 n->subsume_by(n->in(1), this); 3057 if (n->outcnt() == 0) { 3058 n->disconnect_inputs(NULL, this); 3059 } 3060 } 3061 break; 3062 } 3063 #ifdef _LP64 3064 case Op_CmpP: 3065 // Do this transformation here to preserve CmpPNode::sub() and 3066 // other TypePtr related Ideal optimizations (for example, ptr nullness). 3067 if (n->in(1)->is_DecodeNarrowPtr() || n->in(2)->is_DecodeNarrowPtr()) { 3068 Node* in1 = n->in(1); 3069 Node* in2 = n->in(2); 3070 if (!in1->is_DecodeNarrowPtr()) { 3071 in2 = in1; 3072 in1 = n->in(2); 3073 } 3074 assert(in1->is_DecodeNarrowPtr(), "sanity"); 3075 3076 Node* new_in2 = NULL; 3077 if (in2->is_DecodeNarrowPtr()) { 3078 assert(in2->Opcode() == in1->Opcode(), "must be same node type"); 3079 new_in2 = in2->in(1); 3080 } else if (in2->Opcode() == Op_ConP) { 3081 const Type* t = in2->bottom_type(); 3082 if (t == TypePtr::NULL_PTR) { 3083 assert(in1->is_DecodeN(), "compare klass to null?"); 3084 // Don't convert CmpP null check into CmpN if compressed 3085 // oops implicit null check is not generated. 3086 // This will allow to generate normal oop implicit null check. 3087 if (Matcher::gen_narrow_oop_implicit_null_checks()) 3088 new_in2 = ConNode::make(TypeNarrowOop::NULL_PTR); 3089 // 3090 // This transformation together with CastPP transformation above 3091 // will generated code for implicit NULL checks for compressed oops. 3092 // 3093 // The original code after Optimize() 3094 // 3095 // LoadN memory, narrow_oop_reg 3096 // decode narrow_oop_reg, base_reg 3097 // CmpP base_reg, NULL 3098 // CastPP base_reg // NotNull 3099 // Load [base_reg + offset], val_reg 3100 // 3101 // after these transformations will be 3102 // 3103 // LoadN memory, narrow_oop_reg 3104 // CmpN narrow_oop_reg, NULL 3105 // decode_not_null narrow_oop_reg, base_reg 3106 // Load [base_reg + offset], val_reg 3107 // 3108 // and the uncommon path (== NULL) will use narrow_oop_reg directly 3109 // since narrow oops can be used in debug info now (see the code in 3110 // final_graph_reshaping_walk()). 3111 // 3112 // At the end the code will be matched to 3113 // on x86: 3114 // 3115 // Load_narrow_oop memory, narrow_oop_reg 3116 // Load [R12 + narrow_oop_reg<<3 + offset], val_reg 3117 // NullCheck narrow_oop_reg 3118 // 3119 // and on sparc: 3120 // 3121 // Load_narrow_oop memory, narrow_oop_reg 3122 // decode_not_null narrow_oop_reg, base_reg 3123 // Load [base_reg + offset], val_reg 3124 // NullCheck base_reg 3125 // 3126 } else if (t->isa_oopptr()) { 3127 new_in2 = ConNode::make(t->make_narrowoop()); 3128 } else if (t->isa_klassptr()) { 3129 new_in2 = ConNode::make(t->make_narrowklass()); 3130 } 3131 } 3132 if (new_in2 != NULL) { 3133 Node* cmpN = new CmpNNode(in1->in(1), new_in2); 3134 n->subsume_by(cmpN, this); 3135 if (in1->outcnt() == 0) { 3136 in1->disconnect_inputs(NULL, this); 3137 } 3138 if (in2->outcnt() == 0) { 3139 in2->disconnect_inputs(NULL, this); 3140 } 3141 } 3142 } 3143 break; 3144 3145 case Op_DecodeN: 3146 case Op_DecodeNKlass: 3147 assert(!n->in(1)->is_EncodeNarrowPtr(), "should be optimized out"); 3148 // DecodeN could be pinned when it can't be fold into 3149 // an address expression, see the code for Op_CastPP above. 3150 assert(n->in(0) == NULL || (UseCompressedOops && !Matcher::narrow_oop_use_complex_address()), "no control"); 3151 break; 3152 3153 case Op_EncodeP: 3154 case Op_EncodePKlass: { 3155 Node* in1 = n->in(1); 3156 if (in1->is_DecodeNarrowPtr()) { 3157 n->subsume_by(in1->in(1), this); 3158 } else if (in1->Opcode() == Op_ConP) { 3159 const Type* t = in1->bottom_type(); 3160 if (t == TypePtr::NULL_PTR) { 3161 assert(t->isa_oopptr(), "null klass?"); 3162 n->subsume_by(ConNode::make(TypeNarrowOop::NULL_PTR), this); 3163 } else if (t->isa_oopptr()) { 3164 n->subsume_by(ConNode::make(t->make_narrowoop()), this); 3165 } else if (t->isa_klassptr()) { 3166 n->subsume_by(ConNode::make(t->make_narrowklass()), this); 3167 } 3168 } 3169 if (in1->outcnt() == 0) { 3170 in1->disconnect_inputs(NULL, this); 3171 } 3172 break; 3173 } 3174 3175 case Op_Proj: { 3176 if (OptimizeStringConcat) { 3177 ProjNode* p = n->as_Proj(); 3178 if (p->_is_io_use) { 3179 // Separate projections were used for the exception path which 3180 // are normally removed by a late inline. If it wasn't inlined 3181 // then they will hang around and should just be replaced with 3182 // the original one. 3183 Node* proj = NULL; 3184 // Replace with just one 3185 for (SimpleDUIterator i(p->in(0)); i.has_next(); i.next()) { 3186 Node *use = i.get(); 3187 if (use->is_Proj() && p != use && use->as_Proj()->_con == p->_con) { 3188 proj = use; 3189 break; 3190 } 3191 } 3192 assert(proj != NULL, "must be found"); 3193 p->subsume_by(proj, this); 3194 } 3195 } 3196 break; 3197 } 3198 3199 case Op_Phi: 3200 if (n->as_Phi()->bottom_type()->isa_narrowoop() || n->as_Phi()->bottom_type()->isa_narrowklass()) { 3201 // The EncodeP optimization may create Phi with the same edges 3202 // for all paths. It is not handled well by Register Allocator. 3203 Node* unique_in = n->in(1); 3204 assert(unique_in != NULL, ""); 3205 uint cnt = n->req(); 3206 for (uint i = 2; i < cnt; i++) { 3207 Node* m = n->in(i); 3208 assert(m != NULL, ""); 3209 if (unique_in != m) 3210 unique_in = NULL; 3211 } 3212 if (unique_in != NULL) { 3213 n->subsume_by(unique_in, this); 3214 } 3215 } 3216 break; 3217 3218 #endif 3219 3220 #ifdef ASSERT 3221 case Op_CastII: 3222 // Verify that all range check dependent CastII nodes were removed. 3223 if (n->isa_CastII()->has_range_check()) { 3224 n->dump(3); 3225 assert(false, "Range check dependent CastII node was not removed"); 3226 } 3227 break; 3228 #endif 3229 3230 case Op_ModI: 3231 if (UseDivMod) { 3232 // Check if a%b and a/b both exist 3233 Node* d = n->find_similar(Op_DivI); 3234 if (d) { 3235 // Replace them with a fused divmod if supported 3236 if (Matcher::has_match_rule(Op_DivModI)) { 3237 DivModINode* divmod = DivModINode::make(n); 3238 d->subsume_by(divmod->div_proj(), this); 3239 n->subsume_by(divmod->mod_proj(), this); 3240 } else { 3241 // replace a%b with a-((a/b)*b) 3242 Node* mult = new MulINode(d, d->in(2)); 3243 Node* sub = new SubINode(d->in(1), mult); 3244 n->subsume_by(sub, this); 3245 } 3246 } 3247 } 3248 break; 3249 3250 case Op_ModL: 3251 if (UseDivMod) { 3252 // Check if a%b and a/b both exist 3253 Node* d = n->find_similar(Op_DivL); 3254 if (d) { 3255 // Replace them with a fused divmod if supported 3256 if (Matcher::has_match_rule(Op_DivModL)) { 3257 DivModLNode* divmod = DivModLNode::make(n); 3258 d->subsume_by(divmod->div_proj(), this); 3259 n->subsume_by(divmod->mod_proj(), this); 3260 } else { 3261 // replace a%b with a-((a/b)*b) 3262 Node* mult = new MulLNode(d, d->in(2)); 3263 Node* sub = new SubLNode(d->in(1), mult); 3264 n->subsume_by(sub, this); 3265 } 3266 } 3267 } 3268 break; 3269 3270 case Op_LoadVector: 3271 case Op_StoreVector: 3272 break; 3273 3274 case Op_AddReductionVI: 3275 case Op_AddReductionVL: 3276 case Op_AddReductionVF: 3277 case Op_AddReductionVD: 3278 case Op_MulReductionVI: 3279 case Op_MulReductionVL: 3280 case Op_MulReductionVF: 3281 case Op_MulReductionVD: 3282 break; 3283 3284 case Op_PackB: 3285 case Op_PackS: 3286 case Op_PackI: 3287 case Op_PackF: 3288 case Op_PackL: 3289 case Op_PackD: 3290 if (n->req()-1 > 2) { 3291 // Replace many operand PackNodes with a binary tree for matching 3292 PackNode* p = (PackNode*) n; 3293 Node* btp = p->binary_tree_pack(1, n->req()); 3294 n->subsume_by(btp, this); 3295 } 3296 break; 3297 case Op_Loop: 3298 case Op_CountedLoop: 3299 if (n->as_Loop()->is_inner_loop()) { 3300 frc.inc_inner_loop_count(); 3301 } 3302 break; 3303 case Op_LShiftI: 3304 case Op_RShiftI: 3305 case Op_URShiftI: 3306 case Op_LShiftL: 3307 case Op_RShiftL: 3308 case Op_URShiftL: 3309 if (Matcher::need_masked_shift_count) { 3310 // The cpu's shift instructions don't restrict the count to the 3311 // lower 5/6 bits. We need to do the masking ourselves. 3312 Node* in2 = n->in(2); 3313 juint mask = (n->bottom_type() == TypeInt::INT) ? (BitsPerInt - 1) : (BitsPerLong - 1); 3314 const TypeInt* t = in2->find_int_type(); 3315 if (t != NULL && t->is_con()) { 3316 juint shift = t->get_con(); 3317 if (shift > mask) { // Unsigned cmp 3318 n->set_req(2, ConNode::make(TypeInt::make(shift & mask))); 3319 } 3320 } else { 3321 if (t == NULL || t->_lo < 0 || t->_hi > (int)mask) { 3322 Node* shift = new AndINode(in2, ConNode::make(TypeInt::make(mask))); 3323 n->set_req(2, shift); 3324 } 3325 } 3326 if (in2->outcnt() == 0) { // Remove dead node 3327 in2->disconnect_inputs(NULL, this); 3328 } 3329 } 3330 break; 3331 case Op_MemBarStoreStore: 3332 case Op_MemBarRelease: 3333 // Break the link with AllocateNode: it is no longer useful and 3334 // confuses register allocation. 3335 if (n->req() > MemBarNode::Precedent) { 3336 n->set_req(MemBarNode::Precedent, top()); 3337 } 3338 break; 3339 case Op_RangeCheck: { 3340 RangeCheckNode* rc = n->as_RangeCheck(); 3341 Node* iff = new IfNode(rc->in(0), rc->in(1), rc->_prob, rc->_fcnt); 3342 n->subsume_by(iff, this); 3343 frc._tests.push(iff); 3344 break; 3345 } 3346 case Op_ConvI2L: { 3347 if (!Matcher::convi2l_type_required) { 3348 // Code generation on some platforms doesn't need accurate 3349 // ConvI2L types. Widening the type can help remove redundant 3350 // address computations. 3351 n->as_Type()->set_type(TypeLong::INT); 3352 ResourceMark rm; 3353 Node_List wq; 3354 wq.push(n); 3355 for (uint next = 0; next < wq.size(); next++) { 3356 Node *m = wq.at(next); 3357 3358 for(;;) { 3359 // Loop over all nodes with identical inputs edges as m 3360 Node* k = m->find_similar(m->Opcode()); 3361 if (k == NULL) { 3362 break; 3363 } 3364 // Push their uses so we get a chance to remove node made 3365 // redundant 3366 for (DUIterator_Fast imax, i = k->fast_outs(imax); i < imax; i++) { 3367 Node* u = k->fast_out(i); 3368 assert(!wq.contains(u), "shouldn't process one node several times"); 3369 if (u->Opcode() == Op_LShiftL || 3370 u->Opcode() == Op_AddL || 3371 u->Opcode() == Op_SubL || 3372 u->Opcode() == Op_AddP) { 3373 wq.push(u); 3374 } 3375 } 3376 // Replace all nodes with identical edges as m with m 3377 k->subsume_by(m, this); 3378 } 3379 } 3380 } 3381 break; 3382 } 3383 case Op_ValueType: { 3384 ValueTypeNode* vt = n->as_ValueType(); 3385 vt->make_scalar_in_safepoints(root(), NULL); 3386 if (vt->outcnt() == 0) { 3387 vt->disconnect_inputs(NULL, this); 3388 } 3389 break; 3390 } 3391 case Op_ValueTypePtr: { 3392 ShouldNotReachHere(); 3393 break; 3394 } 3395 default: 3396 assert( !n->is_Call(), "" ); 3397 assert( !n->is_Mem(), "" ); 3398 assert( nop != Op_ProfileBoolean, "should be eliminated during IGVN"); 3399 break; 3400 } 3401 3402 // Collect CFG split points 3403 if (n->is_MultiBranch() && !n->is_RangeCheck()) { 3404 frc._tests.push(n); 3405 } 3406 } 3407 3408 //------------------------------final_graph_reshaping_walk--------------------- 3409 // Replacing Opaque nodes with their input in final_graph_reshaping_impl(), 3410 // requires that the walk visits a node's inputs before visiting the node. 3411 void Compile::final_graph_reshaping_walk( Node_Stack &nstack, Node *root, Final_Reshape_Counts &frc ) { 3412 ResourceArea *area = Thread::current()->resource_area(); 3413 Unique_Node_List sfpt(area); 3414 3415 frc._visited.set(root->_idx); // first, mark node as visited 3416 uint cnt = root->req(); 3417 Node *n = root; 3418 uint i = 0; 3419 while (true) { 3420 if (i < cnt) { 3421 // Place all non-visited non-null inputs onto stack 3422 Node* m = n->in(i); 3423 ++i; 3424 if (m != NULL && !frc._visited.test_set(m->_idx)) { 3425 if (m->is_SafePoint() && m->as_SafePoint()->jvms() != NULL) { 3426 // compute worst case interpreter size in case of a deoptimization 3427 update_interpreter_frame_size(m->as_SafePoint()->jvms()->interpreter_frame_size()); 3428 3429 sfpt.push(m); 3430 } 3431 cnt = m->req(); 3432 nstack.push(n, i); // put on stack parent and next input's index 3433 n = m; 3434 i = 0; 3435 } 3436 } else { 3437 // Now do post-visit work 3438 final_graph_reshaping_impl( n, frc ); 3439 if (nstack.is_empty()) 3440 break; // finished 3441 n = nstack.node(); // Get node from stack 3442 cnt = n->req(); 3443 i = nstack.index(); 3444 nstack.pop(); // Shift to the next node on stack 3445 } 3446 } 3447 3448 // Skip next transformation if compressed oops are not used. 3449 if ((UseCompressedOops && !Matcher::gen_narrow_oop_implicit_null_checks()) || 3450 (!UseCompressedOops && !UseCompressedClassPointers)) 3451 return; 3452 3453 // Go over safepoints nodes to skip DecodeN/DecodeNKlass nodes for debug edges. 3454 // It could be done for an uncommon traps or any safepoints/calls 3455 // if the DecodeN/DecodeNKlass node is referenced only in a debug info. 3456 while (sfpt.size() > 0) { 3457 n = sfpt.pop(); 3458 JVMState *jvms = n->as_SafePoint()->jvms(); 3459 assert(jvms != NULL, "sanity"); 3460 int start = jvms->debug_start(); 3461 int end = n->req(); 3462 bool is_uncommon = (n->is_CallStaticJava() && 3463 n->as_CallStaticJava()->uncommon_trap_request() != 0); 3464 for (int j = start; j < end; j++) { 3465 Node* in = n->in(j); 3466 if (in->is_DecodeNarrowPtr()) { 3467 bool safe_to_skip = true; 3468 if (!is_uncommon ) { 3469 // Is it safe to skip? 3470 for (uint i = 0; i < in->outcnt(); i++) { 3471 Node* u = in->raw_out(i); 3472 if (!u->is_SafePoint() || 3473 u->is_Call() && u->as_Call()->has_non_debug_use(n)) { 3474 safe_to_skip = false; 3475 } 3476 } 3477 } 3478 if (safe_to_skip) { 3479 n->set_req(j, in->in(1)); 3480 } 3481 if (in->outcnt() == 0) { 3482 in->disconnect_inputs(NULL, this); 3483 } 3484 } 3485 } 3486 } 3487 } 3488 3489 //------------------------------final_graph_reshaping-------------------------- 3490 // Final Graph Reshaping. 3491 // 3492 // (1) Clone simple inputs to uncommon calls, so they can be scheduled late 3493 // and not commoned up and forced early. Must come after regular 3494 // optimizations to avoid GVN undoing the cloning. Clone constant 3495 // inputs to Loop Phis; these will be split by the allocator anyways. 3496 // Remove Opaque nodes. 3497 // (2) Move last-uses by commutative operations to the left input to encourage 3498 // Intel update-in-place two-address operations and better register usage 3499 // on RISCs. Must come after regular optimizations to avoid GVN Ideal 3500 // calls canonicalizing them back. 3501 // (3) Count the number of double-precision FP ops, single-precision FP ops 3502 // and call sites. On Intel, we can get correct rounding either by 3503 // forcing singles to memory (requires extra stores and loads after each 3504 // FP bytecode) or we can set a rounding mode bit (requires setting and 3505 // clearing the mode bit around call sites). The mode bit is only used 3506 // if the relative frequency of single FP ops to calls is low enough. 3507 // This is a key transform for SPEC mpeg_audio. 3508 // (4) Detect infinite loops; blobs of code reachable from above but not 3509 // below. Several of the Code_Gen algorithms fail on such code shapes, 3510 // so we simply bail out. Happens a lot in ZKM.jar, but also happens 3511 // from time to time in other codes (such as -Xcomp finalizer loops, etc). 3512 // Detection is by looking for IfNodes where only 1 projection is 3513 // reachable from below or CatchNodes missing some targets. 3514 // (5) Assert for insane oop offsets in debug mode. 3515 3516 bool Compile::final_graph_reshaping() { 3517 // an infinite loop may have been eliminated by the optimizer, 3518 // in which case the graph will be empty. 3519 if (root()->req() == 1) { 3520 record_method_not_compilable("trivial infinite loop"); 3521 return true; 3522 } 3523 3524 // Expensive nodes have their control input set to prevent the GVN 3525 // from freely commoning them. There's no GVN beyond this point so 3526 // no need to keep the control input. We want the expensive nodes to 3527 // be freely moved to the least frequent code path by gcm. 3528 assert(OptimizeExpensiveOps || expensive_count() == 0, "optimization off but list non empty?"); 3529 for (int i = 0; i < expensive_count(); i++) { 3530 _expensive_nodes->at(i)->set_req(0, NULL); 3531 } 3532 3533 Final_Reshape_Counts frc; 3534 3535 // Visit everybody reachable! 3536 // Allocate stack of size C->live_nodes()/2 to avoid frequent realloc 3537 Node_Stack nstack(live_nodes() >> 1); 3538 final_graph_reshaping_walk(nstack, root(), frc); 3539 3540 // Check for unreachable (from below) code (i.e., infinite loops). 3541 for( uint i = 0; i < frc._tests.size(); i++ ) { 3542 MultiBranchNode *n = frc._tests[i]->as_MultiBranch(); 3543 // Get number of CFG targets. 3544 // Note that PCTables include exception targets after calls. 3545 uint required_outcnt = n->required_outcnt(); 3546 if (n->outcnt() != required_outcnt) { 3547 // Check for a few special cases. Rethrow Nodes never take the 3548 // 'fall-thru' path, so expected kids is 1 less. 3549 if (n->is_PCTable() && n->in(0) && n->in(0)->in(0)) { 3550 if (n->in(0)->in(0)->is_Call()) { 3551 CallNode *call = n->in(0)->in(0)->as_Call(); 3552 if (call->entry_point() == OptoRuntime::rethrow_stub()) { 3553 required_outcnt--; // Rethrow always has 1 less kid 3554 } else if (call->req() > TypeFunc::Parms && 3555 call->is_CallDynamicJava()) { 3556 // Check for null receiver. In such case, the optimizer has 3557 // detected that the virtual call will always result in a null 3558 // pointer exception. The fall-through projection of this CatchNode 3559 // will not be populated. 3560 Node *arg0 = call->in(TypeFunc::Parms); 3561 if (arg0->is_Type() && 3562 arg0->as_Type()->type()->higher_equal(TypePtr::NULL_PTR)) { 3563 required_outcnt--; 3564 } 3565 } else if (call->entry_point() == OptoRuntime::new_array_Java() && 3566 call->req() > TypeFunc::Parms+1 && 3567 call->is_CallStaticJava()) { 3568 // Check for negative array length. In such case, the optimizer has 3569 // detected that the allocation attempt will always result in an 3570 // exception. There is no fall-through projection of this CatchNode . 3571 Node *arg1 = call->in(TypeFunc::Parms+1); 3572 if (arg1->is_Type() && 3573 arg1->as_Type()->type()->join(TypeInt::POS)->empty()) { 3574 required_outcnt--; 3575 } 3576 } 3577 } 3578 } 3579 // Recheck with a better notion of 'required_outcnt' 3580 if (n->outcnt() != required_outcnt) { 3581 assert(false, "malformed control flow"); 3582 record_method_not_compilable("malformed control flow"); 3583 return true; // Not all targets reachable! 3584 } 3585 } 3586 // Check that I actually visited all kids. Unreached kids 3587 // must be infinite loops. 3588 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) 3589 if (!frc._visited.test(n->fast_out(j)->_idx)) { 3590 record_method_not_compilable("infinite loop"); 3591 assert(false, "infinite loop"); 3592 return true; // Found unvisited kid; must be unreach 3593 } 3594 } 3595 3596 // If original bytecodes contained a mixture of floats and doubles 3597 // check if the optimizer has made it homogenous, item (3). 3598 if( Use24BitFPMode && Use24BitFP && UseSSE == 0 && 3599 frc.get_float_count() > 32 && 3600 frc.get_double_count() == 0 && 3601 (10 * frc.get_call_count() < frc.get_float_count()) ) { 3602 set_24_bit_selection_and_mode( false, true ); 3603 } 3604 3605 set_java_calls(frc.get_java_call_count()); 3606 set_inner_loops(frc.get_inner_loop_count()); 3607 3608 // No infinite loops, no reason to bail out. 3609 return false; 3610 } 3611 3612 //-----------------------------too_many_traps---------------------------------- 3613 // Report if there are too many traps at the current method and bci. 3614 // Return true if there was a trap, and/or PerMethodTrapLimit is exceeded. 3615 bool Compile::too_many_traps(ciMethod* method, 3616 int bci, 3617 Deoptimization::DeoptReason reason) { 3618 ciMethodData* md = method->method_data(); 3619 if (md->is_empty()) { 3620 // Assume the trap has not occurred, or that it occurred only 3621 // because of a transient condition during start-up in the interpreter. 3622 return false; 3623 } 3624 ciMethod* m = Deoptimization::reason_is_speculate(reason) ? this->method() : NULL; 3625 if (md->has_trap_at(bci, m, reason) != 0) { 3626 // Assume PerBytecodeTrapLimit==0, for a more conservative heuristic. 3627 // Also, if there are multiple reasons, or if there is no per-BCI record, 3628 // assume the worst. 3629 if (log()) 3630 log()->elem("observe trap='%s' count='%d'", 3631 Deoptimization::trap_reason_name(reason), 3632 md->trap_count(reason)); 3633 return true; 3634 } else { 3635 // Ignore method/bci and see if there have been too many globally. 3636 return too_many_traps(reason, md); 3637 } 3638 } 3639 3640 // Less-accurate variant which does not require a method and bci. 3641 bool Compile::too_many_traps(Deoptimization::DeoptReason reason, 3642 ciMethodData* logmd) { 3643 if (trap_count(reason) >= Deoptimization::per_method_trap_limit(reason)) { 3644 // Too many traps globally. 3645 // Note that we use cumulative trap_count, not just md->trap_count. 3646 if (log()) { 3647 int mcount = (logmd == NULL)? -1: (int)logmd->trap_count(reason); 3648 log()->elem("observe trap='%s' count='0' mcount='%d' ccount='%d'", 3649 Deoptimization::trap_reason_name(reason), 3650 mcount, trap_count(reason)); 3651 } 3652 return true; 3653 } else { 3654 // The coast is clear. 3655 return false; 3656 } 3657 } 3658 3659 //--------------------------too_many_recompiles-------------------------------- 3660 // Report if there are too many recompiles at the current method and bci. 3661 // Consults PerBytecodeRecompilationCutoff and PerMethodRecompilationCutoff. 3662 // Is not eager to return true, since this will cause the compiler to use 3663 // Action_none for a trap point, to avoid too many recompilations. 3664 bool Compile::too_many_recompiles(ciMethod* method, 3665 int bci, 3666 Deoptimization::DeoptReason reason) { 3667 ciMethodData* md = method->method_data(); 3668 if (md->is_empty()) { 3669 // Assume the trap has not occurred, or that it occurred only 3670 // because of a transient condition during start-up in the interpreter. 3671 return false; 3672 } 3673 // Pick a cutoff point well within PerBytecodeRecompilationCutoff. 3674 uint bc_cutoff = (uint) PerBytecodeRecompilationCutoff / 8; 3675 uint m_cutoff = (uint) PerMethodRecompilationCutoff / 2 + 1; // not zero 3676 Deoptimization::DeoptReason per_bc_reason 3677 = Deoptimization::reason_recorded_per_bytecode_if_any(reason); 3678 ciMethod* m = Deoptimization::reason_is_speculate(reason) ? this->method() : NULL; 3679 if ((per_bc_reason == Deoptimization::Reason_none 3680 || md->has_trap_at(bci, m, reason) != 0) 3681 // The trap frequency measure we care about is the recompile count: 3682 && md->trap_recompiled_at(bci, m) 3683 && md->overflow_recompile_count() >= bc_cutoff) { 3684 // Do not emit a trap here if it has already caused recompilations. 3685 // Also, if there are multiple reasons, or if there is no per-BCI record, 3686 // assume the worst. 3687 if (log()) 3688 log()->elem("observe trap='%s recompiled' count='%d' recompiles2='%d'", 3689 Deoptimization::trap_reason_name(reason), 3690 md->trap_count(reason), 3691 md->overflow_recompile_count()); 3692 return true; 3693 } else if (trap_count(reason) != 0 3694 && decompile_count() >= m_cutoff) { 3695 // Too many recompiles globally, and we have seen this sort of trap. 3696 // Use cumulative decompile_count, not just md->decompile_count. 3697 if (log()) 3698 log()->elem("observe trap='%s' count='%d' mcount='%d' decompiles='%d' mdecompiles='%d'", 3699 Deoptimization::trap_reason_name(reason), 3700 md->trap_count(reason), trap_count(reason), 3701 md->decompile_count(), decompile_count()); 3702 return true; 3703 } else { 3704 // The coast is clear. 3705 return false; 3706 } 3707 } 3708 3709 // Compute when not to trap. Used by matching trap based nodes and 3710 // NullCheck optimization. 3711 void Compile::set_allowed_deopt_reasons() { 3712 _allowed_reasons = 0; 3713 if (is_method_compilation()) { 3714 for (int rs = (int)Deoptimization::Reason_none+1; rs < Compile::trapHistLength; rs++) { 3715 assert(rs < BitsPerInt, "recode bit map"); 3716 if (!too_many_traps((Deoptimization::DeoptReason) rs)) { 3717 _allowed_reasons |= nth_bit(rs); 3718 } 3719 } 3720 } 3721 } 3722 3723 #ifndef PRODUCT 3724 //------------------------------verify_graph_edges--------------------------- 3725 // Walk the Graph and verify that there is a one-to-one correspondence 3726 // between Use-Def edges and Def-Use edges in the graph. 3727 void Compile::verify_graph_edges(bool no_dead_code) { 3728 if (VerifyGraphEdges) { 3729 ResourceArea *area = Thread::current()->resource_area(); 3730 Unique_Node_List visited(area); 3731 // Call recursive graph walk to check edges 3732 _root->verify_edges(visited); 3733 if (no_dead_code) { 3734 // Now make sure that no visited node is used by an unvisited node. 3735 bool dead_nodes = false; 3736 Unique_Node_List checked(area); 3737 while (visited.size() > 0) { 3738 Node* n = visited.pop(); 3739 checked.push(n); 3740 for (uint i = 0; i < n->outcnt(); i++) { 3741 Node* use = n->raw_out(i); 3742 if (checked.member(use)) continue; // already checked 3743 if (visited.member(use)) continue; // already in the graph 3744 if (use->is_Con()) continue; // a dead ConNode is OK 3745 // At this point, we have found a dead node which is DU-reachable. 3746 if (!dead_nodes) { 3747 tty->print_cr("*** Dead nodes reachable via DU edges:"); 3748 dead_nodes = true; 3749 } 3750 use->dump(2); 3751 tty->print_cr("---"); 3752 checked.push(use); // No repeats; pretend it is now checked. 3753 } 3754 } 3755 assert(!dead_nodes, "using nodes must be reachable from root"); 3756 } 3757 } 3758 } 3759 3760 // Verify GC barriers consistency 3761 // Currently supported: 3762 // - G1 pre-barriers (see GraphKit::g1_write_barrier_pre()) 3763 void Compile::verify_barriers() { 3764 if (UseG1GC) { 3765 // Verify G1 pre-barriers 3766 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + SATBMarkQueue::byte_offset_of_active()); 3767 3768 ResourceArea *area = Thread::current()->resource_area(); 3769 Unique_Node_List visited(area); 3770 Node_List worklist(area); 3771 // We're going to walk control flow backwards starting from the Root 3772 worklist.push(_root); 3773 while (worklist.size() > 0) { 3774 Node* x = worklist.pop(); 3775 if (x == NULL || x == top()) continue; 3776 if (visited.member(x)) { 3777 continue; 3778 } else { 3779 visited.push(x); 3780 } 3781 3782 if (x->is_Region()) { 3783 for (uint i = 1; i < x->req(); i++) { 3784 worklist.push(x->in(i)); 3785 } 3786 } else { 3787 worklist.push(x->in(0)); 3788 // We are looking for the pattern: 3789 // /->ThreadLocal 3790 // If->Bool->CmpI->LoadB->AddP->ConL(marking_offset) 3791 // \->ConI(0) 3792 // We want to verify that the If and the LoadB have the same control 3793 // See GraphKit::g1_write_barrier_pre() 3794 if (x->is_If()) { 3795 IfNode *iff = x->as_If(); 3796 if (iff->in(1)->is_Bool() && iff->in(1)->in(1)->is_Cmp()) { 3797 CmpNode *cmp = iff->in(1)->in(1)->as_Cmp(); 3798 if (cmp->Opcode() == Op_CmpI && cmp->in(2)->is_Con() && cmp->in(2)->bottom_type()->is_int()->get_con() == 0 3799 && cmp->in(1)->is_Load()) { 3800 LoadNode* load = cmp->in(1)->as_Load(); 3801 if (load->Opcode() == Op_LoadB && load->in(2)->is_AddP() && load->in(2)->in(2)->Opcode() == Op_ThreadLocal 3802 && load->in(2)->in(3)->is_Con() 3803 && load->in(2)->in(3)->bottom_type()->is_intptr_t()->get_con() == marking_offset) { 3804 3805 Node* if_ctrl = iff->in(0); 3806 Node* load_ctrl = load->in(0); 3807 3808 if (if_ctrl != load_ctrl) { 3809 // Skip possible CProj->NeverBranch in infinite loops 3810 if ((if_ctrl->is_Proj() && if_ctrl->Opcode() == Op_CProj) 3811 && (if_ctrl->in(0)->is_MultiBranch() && if_ctrl->in(0)->Opcode() == Op_NeverBranch)) { 3812 if_ctrl = if_ctrl->in(0)->in(0); 3813 } 3814 } 3815 assert(load_ctrl != NULL && if_ctrl == load_ctrl, "controls must match"); 3816 } 3817 } 3818 } 3819 } 3820 } 3821 } 3822 } 3823 } 3824 3825 #endif 3826 3827 // The Compile object keeps track of failure reasons separately from the ciEnv. 3828 // This is required because there is not quite a 1-1 relation between the 3829 // ciEnv and its compilation task and the Compile object. Note that one 3830 // ciEnv might use two Compile objects, if C2Compiler::compile_method decides 3831 // to backtrack and retry without subsuming loads. Other than this backtracking 3832 // behavior, the Compile's failure reason is quietly copied up to the ciEnv 3833 // by the logic in C2Compiler. 3834 void Compile::record_failure(const char* reason) { 3835 if (log() != NULL) { 3836 log()->elem("failure reason='%s' phase='compile'", reason); 3837 } 3838 if (_failure_reason == NULL) { 3839 // Record the first failure reason. 3840 _failure_reason = reason; 3841 } 3842 3843 if (!C->failure_reason_is(C2Compiler::retry_no_subsuming_loads())) { 3844 C->print_method(PHASE_FAILURE); 3845 } 3846 _root = NULL; // flush the graph, too 3847 } 3848 3849 Compile::TracePhase::TracePhase(const char* name, elapsedTimer* accumulator) 3850 : TraceTime(name, accumulator, CITime, CITimeVerbose), 3851 _phase_name(name), _dolog(CITimeVerbose) 3852 { 3853 if (_dolog) { 3854 C = Compile::current(); 3855 _log = C->log(); 3856 } else { 3857 C = NULL; 3858 _log = NULL; 3859 } 3860 if (_log != NULL) { 3861 _log->begin_head("phase name='%s' nodes='%d' live='%d'", _phase_name, C->unique(), C->live_nodes()); 3862 _log->stamp(); 3863 _log->end_head(); 3864 } 3865 } 3866 3867 Compile::TracePhase::~TracePhase() { 3868 3869 C = Compile::current(); 3870 if (_dolog) { 3871 _log = C->log(); 3872 } else { 3873 _log = NULL; 3874 } 3875 3876 #ifdef ASSERT 3877 if (PrintIdealNodeCount) { 3878 tty->print_cr("phase name='%s' nodes='%d' live='%d' live_graph_walk='%d'", 3879 _phase_name, C->unique(), C->live_nodes(), C->count_live_nodes_by_graph_walk()); 3880 } 3881 3882 if (VerifyIdealNodeCount) { 3883 Compile::current()->print_missing_nodes(); 3884 } 3885 #endif 3886 3887 if (_log != NULL) { 3888 _log->done("phase name='%s' nodes='%d' live='%d'", _phase_name, C->unique(), C->live_nodes()); 3889 } 3890 } 3891 3892 //============================================================================= 3893 // Two Constant's are equal when the type and the value are equal. 3894 bool Compile::Constant::operator==(const Constant& other) { 3895 if (type() != other.type() ) return false; 3896 if (can_be_reused() != other.can_be_reused()) return false; 3897 // For floating point values we compare the bit pattern. 3898 switch (type()) { 3899 case T_INT: 3900 case T_FLOAT: return (_v._value.i == other._v._value.i); 3901 case T_LONG: 3902 case T_DOUBLE: return (_v._value.j == other._v._value.j); 3903 case T_OBJECT: 3904 case T_ADDRESS: return (_v._value.l == other._v._value.l); 3905 case T_VOID: return (_v._value.l == other._v._value.l); // jump-table entries 3906 case T_METADATA: return (_v._metadata == other._v._metadata); 3907 default: ShouldNotReachHere(); 3908 } 3909 return false; 3910 } 3911 3912 static int type_to_size_in_bytes(BasicType t) { 3913 switch (t) { 3914 case T_INT: return sizeof(jint ); 3915 case T_LONG: return sizeof(jlong ); 3916 case T_FLOAT: return sizeof(jfloat ); 3917 case T_DOUBLE: return sizeof(jdouble); 3918 case T_METADATA: return sizeof(Metadata*); 3919 // We use T_VOID as marker for jump-table entries (labels) which 3920 // need an internal word relocation. 3921 case T_VOID: 3922 case T_ADDRESS: 3923 case T_OBJECT: return sizeof(jobject); 3924 } 3925 3926 ShouldNotReachHere(); 3927 return -1; 3928 } 3929 3930 int Compile::ConstantTable::qsort_comparator(Constant* a, Constant* b) { 3931 // sort descending 3932 if (a->freq() > b->freq()) return -1; 3933 if (a->freq() < b->freq()) return 1; 3934 return 0; 3935 } 3936 3937 void Compile::ConstantTable::calculate_offsets_and_size() { 3938 // First, sort the array by frequencies. 3939 _constants.sort(qsort_comparator); 3940 3941 #ifdef ASSERT 3942 // Make sure all jump-table entries were sorted to the end of the 3943 // array (they have a negative frequency). 3944 bool found_void = false; 3945 for (int i = 0; i < _constants.length(); i++) { 3946 Constant con = _constants.at(i); 3947 if (con.type() == T_VOID) 3948 found_void = true; // jump-tables 3949 else 3950 assert(!found_void, "wrong sorting"); 3951 } 3952 #endif 3953 3954 int offset = 0; 3955 for (int i = 0; i < _constants.length(); i++) { 3956 Constant* con = _constants.adr_at(i); 3957 3958 // Align offset for type. 3959 int typesize = type_to_size_in_bytes(con->type()); 3960 offset = align_size_up(offset, typesize); 3961 con->set_offset(offset); // set constant's offset 3962 3963 if (con->type() == T_VOID) { 3964 MachConstantNode* n = (MachConstantNode*) con->get_jobject(); 3965 offset = offset + typesize * n->outcnt(); // expand jump-table 3966 } else { 3967 offset = offset + typesize; 3968 } 3969 } 3970 3971 // Align size up to the next section start (which is insts; see 3972 // CodeBuffer::align_at_start). 3973 assert(_size == -1, "already set?"); 3974 _size = align_size_up(offset, CodeEntryAlignment); 3975 } 3976 3977 void Compile::ConstantTable::emit(CodeBuffer& cb) { 3978 MacroAssembler _masm(&cb); 3979 for (int i = 0; i < _constants.length(); i++) { 3980 Constant con = _constants.at(i); 3981 address constant_addr = NULL; 3982 switch (con.type()) { 3983 case T_INT: constant_addr = _masm.int_constant( con.get_jint() ); break; 3984 case T_LONG: constant_addr = _masm.long_constant( con.get_jlong() ); break; 3985 case T_FLOAT: constant_addr = _masm.float_constant( con.get_jfloat() ); break; 3986 case T_DOUBLE: constant_addr = _masm.double_constant(con.get_jdouble()); break; 3987 case T_OBJECT: { 3988 jobject obj = con.get_jobject(); 3989 int oop_index = _masm.oop_recorder()->find_index(obj); 3990 constant_addr = _masm.address_constant((address) obj, oop_Relocation::spec(oop_index)); 3991 break; 3992 } 3993 case T_ADDRESS: { 3994 address addr = (address) con.get_jobject(); 3995 constant_addr = _masm.address_constant(addr); 3996 break; 3997 } 3998 // We use T_VOID as marker for jump-table entries (labels) which 3999 // need an internal word relocation. 4000 case T_VOID: { 4001 MachConstantNode* n = (MachConstantNode*) con.get_jobject(); 4002 // Fill the jump-table with a dummy word. The real value is 4003 // filled in later in fill_jump_table. 4004 address dummy = (address) n; 4005 constant_addr = _masm.address_constant(dummy); 4006 // Expand jump-table 4007 for (uint i = 1; i < n->outcnt(); i++) { 4008 address temp_addr = _masm.address_constant(dummy + i); 4009 assert(temp_addr, "consts section too small"); 4010 } 4011 break; 4012 } 4013 case T_METADATA: { 4014 Metadata* obj = con.get_metadata(); 4015 int metadata_index = _masm.oop_recorder()->find_index(obj); 4016 constant_addr = _masm.address_constant((address) obj, metadata_Relocation::spec(metadata_index)); 4017 break; 4018 } 4019 default: ShouldNotReachHere(); 4020 } 4021 assert(constant_addr, "consts section too small"); 4022 assert((constant_addr - _masm.code()->consts()->start()) == con.offset(), 4023 "must be: %d == %d", (int) (constant_addr - _masm.code()->consts()->start()), (int)(con.offset())); 4024 } 4025 } 4026 4027 int Compile::ConstantTable::find_offset(Constant& con) const { 4028 int idx = _constants.find(con); 4029 assert(idx != -1, "constant must be in constant table"); 4030 int offset = _constants.at(idx).offset(); 4031 assert(offset != -1, "constant table not emitted yet?"); 4032 return offset; 4033 } 4034 4035 void Compile::ConstantTable::add(Constant& con) { 4036 if (con.can_be_reused()) { 4037 int idx = _constants.find(con); 4038 if (idx != -1 && _constants.at(idx).can_be_reused()) { 4039 _constants.adr_at(idx)->inc_freq(con.freq()); // increase the frequency by the current value 4040 return; 4041 } 4042 } 4043 (void) _constants.append(con); 4044 } 4045 4046 Compile::Constant Compile::ConstantTable::add(MachConstantNode* n, BasicType type, jvalue value) { 4047 Block* b = Compile::current()->cfg()->get_block_for_node(n); 4048 Constant con(type, value, b->_freq); 4049 add(con); 4050 return con; 4051 } 4052 4053 Compile::Constant Compile::ConstantTable::add(Metadata* metadata) { 4054 Constant con(metadata); 4055 add(con); 4056 return con; 4057 } 4058 4059 Compile::Constant Compile::ConstantTable::add(MachConstantNode* n, MachOper* oper) { 4060 jvalue value; 4061 BasicType type = oper->type()->basic_type(); 4062 switch (type) { 4063 case T_LONG: value.j = oper->constantL(); break; 4064 case T_FLOAT: value.f = oper->constantF(); break; 4065 case T_DOUBLE: value.d = oper->constantD(); break; 4066 case T_OBJECT: 4067 case T_ADDRESS: value.l = (jobject) oper->constant(); break; 4068 case T_METADATA: return add((Metadata*)oper->constant()); break; 4069 default: guarantee(false, "unhandled type: %s", type2name(type)); 4070 } 4071 return add(n, type, value); 4072 } 4073 4074 Compile::Constant Compile::ConstantTable::add_jump_table(MachConstantNode* n) { 4075 jvalue value; 4076 // We can use the node pointer here to identify the right jump-table 4077 // as this method is called from Compile::Fill_buffer right before 4078 // the MachNodes are emitted and the jump-table is filled (means the 4079 // MachNode pointers do not change anymore). 4080 value.l = (jobject) n; 4081 Constant con(T_VOID, value, next_jump_table_freq(), false); // Labels of a jump-table cannot be reused. 4082 add(con); 4083 return con; 4084 } 4085 4086 void Compile::ConstantTable::fill_jump_table(CodeBuffer& cb, MachConstantNode* n, GrowableArray<Label*> labels) const { 4087 // If called from Compile::scratch_emit_size do nothing. 4088 if (Compile::current()->in_scratch_emit_size()) return; 4089 4090 assert(labels.is_nonempty(), "must be"); 4091 assert((uint) labels.length() == n->outcnt(), "must be equal: %d == %d", labels.length(), n->outcnt()); 4092 4093 // Since MachConstantNode::constant_offset() also contains 4094 // table_base_offset() we need to subtract the table_base_offset() 4095 // to get the plain offset into the constant table. 4096 int offset = n->constant_offset() - table_base_offset(); 4097 4098 MacroAssembler _masm(&cb); 4099 address* jump_table_base = (address*) (_masm.code()->consts()->start() + offset); 4100 4101 for (uint i = 0; i < n->outcnt(); i++) { 4102 address* constant_addr = &jump_table_base[i]; 4103 assert(*constant_addr == (((address) n) + i), "all jump-table entries must contain adjusted node pointer: " INTPTR_FORMAT " == " INTPTR_FORMAT, p2i(*constant_addr), p2i(((address) n) + i)); 4104 *constant_addr = cb.consts()->target(*labels.at(i), (address) constant_addr); 4105 cb.consts()->relocate((address) constant_addr, relocInfo::internal_word_type); 4106 } 4107 } 4108 4109 //----------------------------static_subtype_check----------------------------- 4110 // Shortcut important common cases when superklass is exact: 4111 // (0) superklass is java.lang.Object (can occur in reflective code) 4112 // (1) subklass is already limited to a subtype of superklass => always ok 4113 // (2) subklass does not overlap with superklass => always fail 4114 // (3) superklass has NO subtypes and we can check with a simple compare. 4115 int Compile::static_subtype_check(ciKlass* superk, ciKlass* subk) { 4116 if (StressReflectiveCode || superk == NULL || subk == NULL) { 4117 return SSC_full_test; // Let caller generate the general case. 4118 } 4119 4120 if (!EnableMVT && !EnableValhalla && superk == env()->Object_klass()) { 4121 return SSC_always_true; // (0) this test cannot fail 4122 } 4123 4124 ciType* superelem = superk; 4125 if (superelem->is_array_klass()) 4126 superelem = superelem->as_array_klass()->base_element_type(); 4127 4128 if (!subk->is_interface()) { // cannot trust static interface types yet 4129 if (subk->is_subtype_of(superk)) { 4130 return SSC_always_true; // (1) false path dead; no dynamic test needed 4131 } 4132 if (!(superelem->is_klass() && superelem->as_klass()->is_interface()) && 4133 !superk->is_subtype_of(subk)) { 4134 return SSC_always_false; 4135 } 4136 } 4137 4138 // If casting to an instance klass, it must have no subtypes 4139 if (superk->is_interface()) { 4140 // Cannot trust interfaces yet. 4141 // %%% S.B. superk->nof_implementors() == 1 4142 } else if (superelem->is_instance_klass()) { 4143 ciInstanceKlass* ik = superelem->as_instance_klass(); 4144 if (!ik->has_subklass() && !ik->is_interface()) { 4145 if (!ik->is_final()) { 4146 // Add a dependency if there is a chance of a later subclass. 4147 dependencies()->assert_leaf_type(ik); 4148 } 4149 return SSC_easy_test; // (3) caller can do a simple ptr comparison 4150 } 4151 } else { 4152 // A primitive array type has no subtypes. 4153 return SSC_easy_test; // (3) caller can do a simple ptr comparison 4154 } 4155 4156 return SSC_full_test; 4157 } 4158 4159 Node* Compile::conv_I2X_index(PhaseGVN* phase, Node* idx, const TypeInt* sizetype, Node* ctrl) { 4160 #ifdef _LP64 4161 // The scaled index operand to AddP must be a clean 64-bit value. 4162 // Java allows a 32-bit int to be incremented to a negative 4163 // value, which appears in a 64-bit register as a large 4164 // positive number. Using that large positive number as an 4165 // operand in pointer arithmetic has bad consequences. 4166 // On the other hand, 32-bit overflow is rare, and the possibility 4167 // can often be excluded, if we annotate the ConvI2L node with 4168 // a type assertion that its value is known to be a small positive 4169 // number. (The prior range check has ensured this.) 4170 // This assertion is used by ConvI2LNode::Ideal. 4171 int index_max = max_jint - 1; // array size is max_jint, index is one less 4172 if (sizetype != NULL) index_max = sizetype->_hi - 1; 4173 const TypeInt* iidxtype = TypeInt::make(0, index_max, Type::WidenMax); 4174 idx = constrained_convI2L(phase, idx, iidxtype, ctrl); 4175 #endif 4176 return idx; 4177 } 4178 4179 // Convert integer value to a narrowed long type dependent on ctrl (for example, a range check) 4180 Node* Compile::constrained_convI2L(PhaseGVN* phase, Node* value, const TypeInt* itype, Node* ctrl) { 4181 if (ctrl != NULL) { 4182 // Express control dependency by a CastII node with a narrow type. 4183 value = new CastIINode(value, itype, false, true /* range check dependency */); 4184 // Make the CastII node dependent on the control input to prevent the narrowed ConvI2L 4185 // node from floating above the range check during loop optimizations. Otherwise, the 4186 // ConvI2L node may be eliminated independently of the range check, causing the data path 4187 // to become TOP while the control path is still there (although it's unreachable). 4188 value->set_req(0, ctrl); 4189 // Save CastII node to remove it after loop optimizations. 4190 phase->C->add_range_check_cast(value); 4191 value = phase->transform(value); 4192 } 4193 const TypeLong* ltype = TypeLong::make(itype->_lo, itype->_hi, itype->_widen); 4194 return phase->transform(new ConvI2LNode(value, ltype)); 4195 } 4196 4197 // The message about the current inlining is accumulated in 4198 // _print_inlining_stream and transfered into the _print_inlining_list 4199 // once we know whether inlining succeeds or not. For regular 4200 // inlining, messages are appended to the buffer pointed by 4201 // _print_inlining_idx in the _print_inlining_list. For late inlining, 4202 // a new buffer is added after _print_inlining_idx in the list. This 4203 // way we can update the inlining message for late inlining call site 4204 // when the inlining is attempted again. 4205 void Compile::print_inlining_init() { 4206 if (print_inlining() || print_intrinsics()) { 4207 _print_inlining_stream = new stringStream(); 4208 _print_inlining_list = new (comp_arena())GrowableArray<PrintInliningBuffer>(comp_arena(), 1, 1, PrintInliningBuffer()); 4209 } 4210 } 4211 4212 void Compile::print_inlining_reinit() { 4213 if (print_inlining() || print_intrinsics()) { 4214 // Re allocate buffer when we change ResourceMark 4215 _print_inlining_stream = new stringStream(); 4216 } 4217 } 4218 4219 void Compile::print_inlining_reset() { 4220 _print_inlining_stream->reset(); 4221 } 4222 4223 void Compile::print_inlining_commit() { 4224 assert(print_inlining() || print_intrinsics(), "PrintInlining off?"); 4225 // Transfer the message from _print_inlining_stream to the current 4226 // _print_inlining_list buffer and clear _print_inlining_stream. 4227 _print_inlining_list->at(_print_inlining_idx).ss()->write(_print_inlining_stream->as_string(), _print_inlining_stream->size()); 4228 print_inlining_reset(); 4229 } 4230 4231 void Compile::print_inlining_push() { 4232 // Add new buffer to the _print_inlining_list at current position 4233 _print_inlining_idx++; 4234 _print_inlining_list->insert_before(_print_inlining_idx, PrintInliningBuffer()); 4235 } 4236 4237 Compile::PrintInliningBuffer& Compile::print_inlining_current() { 4238 return _print_inlining_list->at(_print_inlining_idx); 4239 } 4240 4241 void Compile::print_inlining_update(CallGenerator* cg) { 4242 if (print_inlining() || print_intrinsics()) { 4243 if (!cg->is_late_inline()) { 4244 if (print_inlining_current().cg() != NULL) { 4245 print_inlining_push(); 4246 } 4247 print_inlining_commit(); 4248 } else { 4249 if (print_inlining_current().cg() != cg && 4250 (print_inlining_current().cg() != NULL || 4251 print_inlining_current().ss()->size() != 0)) { 4252 print_inlining_push(); 4253 } 4254 print_inlining_commit(); 4255 print_inlining_current().set_cg(cg); 4256 } 4257 } 4258 } 4259 4260 void Compile::print_inlining_move_to(CallGenerator* cg) { 4261 // We resume inlining at a late inlining call site. Locate the 4262 // corresponding inlining buffer so that we can update it. 4263 if (print_inlining()) { 4264 for (int i = 0; i < _print_inlining_list->length(); i++) { 4265 if (_print_inlining_list->adr_at(i)->cg() == cg) { 4266 _print_inlining_idx = i; 4267 return; 4268 } 4269 } 4270 ShouldNotReachHere(); 4271 } 4272 } 4273 4274 void Compile::print_inlining_update_delayed(CallGenerator* cg) { 4275 if (print_inlining()) { 4276 assert(_print_inlining_stream->size() > 0, "missing inlining msg"); 4277 assert(print_inlining_current().cg() == cg, "wrong entry"); 4278 // replace message with new message 4279 _print_inlining_list->at_put(_print_inlining_idx, PrintInliningBuffer()); 4280 print_inlining_commit(); 4281 print_inlining_current().set_cg(cg); 4282 } 4283 } 4284 4285 void Compile::print_inlining_assert_ready() { 4286 assert(!_print_inlining || _print_inlining_stream->size() == 0, "loosing data"); 4287 } 4288 4289 void Compile::process_print_inlining() { 4290 bool do_print_inlining = print_inlining() || print_intrinsics(); 4291 if (do_print_inlining || log() != NULL) { 4292 // Print inlining message for candidates that we couldn't inline 4293 // for lack of space 4294 for (int i = 0; i < _late_inlines.length(); i++) { 4295 CallGenerator* cg = _late_inlines.at(i); 4296 if (!cg->is_mh_late_inline()) { 4297 const char* msg = "live nodes > LiveNodeCountInliningCutoff"; 4298 if (do_print_inlining) { 4299 cg->print_inlining_late(msg); 4300 } 4301 log_late_inline_failure(cg, msg); 4302 } 4303 } 4304 } 4305 if (do_print_inlining) { 4306 ResourceMark rm; 4307 stringStream ss; 4308 for (int i = 0; i < _print_inlining_list->length(); i++) { 4309 ss.print("%s", _print_inlining_list->adr_at(i)->ss()->as_string()); 4310 } 4311 size_t end = ss.size(); 4312 _print_inlining_output = NEW_ARENA_ARRAY(comp_arena(), char, end+1); 4313 strncpy(_print_inlining_output, ss.base(), end+1); 4314 _print_inlining_output[end] = 0; 4315 } 4316 } 4317 4318 void Compile::dump_print_inlining() { 4319 if (_print_inlining_output != NULL) { 4320 tty->print_raw(_print_inlining_output); 4321 } 4322 } 4323 4324 void Compile::log_late_inline(CallGenerator* cg) { 4325 if (log() != NULL) { 4326 log()->head("late_inline method='%d' inline_id='" JLONG_FORMAT "'", log()->identify(cg->method()), 4327 cg->unique_id()); 4328 JVMState* p = cg->call_node()->jvms(); 4329 while (p != NULL) { 4330 log()->elem("jvms bci='%d' method='%d'", p->bci(), log()->identify(p->method())); 4331 p = p->caller(); 4332 } 4333 log()->tail("late_inline"); 4334 } 4335 } 4336 4337 void Compile::log_late_inline_failure(CallGenerator* cg, const char* msg) { 4338 log_late_inline(cg); 4339 if (log() != NULL) { 4340 log()->inline_fail(msg); 4341 } 4342 } 4343 4344 void Compile::log_inline_id(CallGenerator* cg) { 4345 if (log() != NULL) { 4346 // The LogCompilation tool needs a unique way to identify late 4347 // inline call sites. This id must be unique for this call site in 4348 // this compilation. Try to have it unique across compilations as 4349 // well because it can be convenient when grepping through the log 4350 // file. 4351 // Distinguish OSR compilations from others in case CICountOSR is 4352 // on. 4353 jlong id = ((jlong)unique()) + (((jlong)compile_id()) << 33) + (CICountOSR && is_osr_compilation() ? ((jlong)1) << 32 : 0); 4354 cg->set_unique_id(id); 4355 log()->elem("inline_id id='" JLONG_FORMAT "'", id); 4356 } 4357 } 4358 4359 void Compile::log_inline_failure(const char* msg) { 4360 if (C->log() != NULL) { 4361 C->log()->inline_fail(msg); 4362 } 4363 } 4364 4365 4366 // Dump inlining replay data to the stream. 4367 // Don't change thread state and acquire any locks. 4368 void Compile::dump_inline_data(outputStream* out) { 4369 InlineTree* inl_tree = ilt(); 4370 if (inl_tree != NULL) { 4371 out->print(" inline %d", inl_tree->count()); 4372 inl_tree->dump_replay_data(out); 4373 } 4374 } 4375 4376 int Compile::cmp_expensive_nodes(Node* n1, Node* n2) { 4377 if (n1->Opcode() < n2->Opcode()) return -1; 4378 else if (n1->Opcode() > n2->Opcode()) return 1; 4379 4380 assert(n1->req() == n2->req(), "can't compare %s nodes: n1->req() = %d, n2->req() = %d", NodeClassNames[n1->Opcode()], n1->req(), n2->req()); 4381 for (uint i = 1; i < n1->req(); i++) { 4382 if (n1->in(i) < n2->in(i)) return -1; 4383 else if (n1->in(i) > n2->in(i)) return 1; 4384 } 4385 4386 return 0; 4387 } 4388 4389 int Compile::cmp_expensive_nodes(Node** n1p, Node** n2p) { 4390 Node* n1 = *n1p; 4391 Node* n2 = *n2p; 4392 4393 return cmp_expensive_nodes(n1, n2); 4394 } 4395 4396 void Compile::sort_expensive_nodes() { 4397 if (!expensive_nodes_sorted()) { 4398 _expensive_nodes->sort(cmp_expensive_nodes); 4399 } 4400 } 4401 4402 bool Compile::expensive_nodes_sorted() const { 4403 for (int i = 1; i < _expensive_nodes->length(); i++) { 4404 if (cmp_expensive_nodes(_expensive_nodes->adr_at(i), _expensive_nodes->adr_at(i-1)) < 0) { 4405 return false; 4406 } 4407 } 4408 return true; 4409 } 4410 4411 bool Compile::should_optimize_expensive_nodes(PhaseIterGVN &igvn) { 4412 if (_expensive_nodes->length() == 0) { 4413 return false; 4414 } 4415 4416 assert(OptimizeExpensiveOps, "optimization off?"); 4417 4418 // Take this opportunity to remove dead nodes from the list 4419 int j = 0; 4420 for (int i = 0; i < _expensive_nodes->length(); i++) { 4421 Node* n = _expensive_nodes->at(i); 4422 if (!n->is_unreachable(igvn)) { 4423 assert(n->is_expensive(), "should be expensive"); 4424 _expensive_nodes->at_put(j, n); 4425 j++; 4426 } 4427 } 4428 _expensive_nodes->trunc_to(j); 4429 4430 // Then sort the list so that similar nodes are next to each other 4431 // and check for at least two nodes of identical kind with same data 4432 // inputs. 4433 sort_expensive_nodes(); 4434 4435 for (int i = 0; i < _expensive_nodes->length()-1; i++) { 4436 if (cmp_expensive_nodes(_expensive_nodes->adr_at(i), _expensive_nodes->adr_at(i+1)) == 0) { 4437 return true; 4438 } 4439 } 4440 4441 return false; 4442 } 4443 4444 void Compile::cleanup_expensive_nodes(PhaseIterGVN &igvn) { 4445 if (_expensive_nodes->length() == 0) { 4446 return; 4447 } 4448 4449 assert(OptimizeExpensiveOps, "optimization off?"); 4450 4451 // Sort to bring similar nodes next to each other and clear the 4452 // control input of nodes for which there's only a single copy. 4453 sort_expensive_nodes(); 4454 4455 int j = 0; 4456 int identical = 0; 4457 int i = 0; 4458 bool modified = false; 4459 for (; i < _expensive_nodes->length()-1; i++) { 4460 assert(j <= i, "can't write beyond current index"); 4461 if (_expensive_nodes->at(i)->Opcode() == _expensive_nodes->at(i+1)->Opcode()) { 4462 identical++; 4463 _expensive_nodes->at_put(j++, _expensive_nodes->at(i)); 4464 continue; 4465 } 4466 if (identical > 0) { 4467 _expensive_nodes->at_put(j++, _expensive_nodes->at(i)); 4468 identical = 0; 4469 } else { 4470 Node* n = _expensive_nodes->at(i); 4471 igvn.replace_input_of(n, 0, NULL); 4472 igvn.hash_insert(n); 4473 modified = true; 4474 } 4475 } 4476 if (identical > 0) { 4477 _expensive_nodes->at_put(j++, _expensive_nodes->at(i)); 4478 } else if (_expensive_nodes->length() >= 1) { 4479 Node* n = _expensive_nodes->at(i); 4480 igvn.replace_input_of(n, 0, NULL); 4481 igvn.hash_insert(n); 4482 modified = true; 4483 } 4484 _expensive_nodes->trunc_to(j); 4485 if (modified) { 4486 igvn.optimize(); 4487 } 4488 } 4489 4490 void Compile::add_expensive_node(Node * n) { 4491 assert(!_expensive_nodes->contains(n), "duplicate entry in expensive list"); 4492 assert(n->is_expensive(), "expensive nodes with non-null control here only"); 4493 assert(!n->is_CFG() && !n->is_Mem(), "no cfg or memory nodes here"); 4494 if (OptimizeExpensiveOps) { 4495 _expensive_nodes->append(n); 4496 } else { 4497 // Clear control input and let IGVN optimize expensive nodes if 4498 // OptimizeExpensiveOps is off. 4499 n->set_req(0, NULL); 4500 } 4501 } 4502 4503 /** 4504 * Remove the speculative part of types and clean up the graph 4505 */ 4506 void Compile::remove_speculative_types(PhaseIterGVN &igvn) { 4507 if (UseTypeSpeculation) { 4508 Unique_Node_List worklist; 4509 worklist.push(root()); 4510 int modified = 0; 4511 // Go over all type nodes that carry a speculative type, drop the 4512 // speculative part of the type and enqueue the node for an igvn 4513 // which may optimize it out. 4514 for (uint next = 0; next < worklist.size(); ++next) { 4515 Node *n = worklist.at(next); 4516 if (n->is_Type()) { 4517 TypeNode* tn = n->as_Type(); 4518 const Type* t = tn->type(); 4519 const Type* t_no_spec = t->remove_speculative(); 4520 if (t_no_spec != t) { 4521 bool in_hash = igvn.hash_delete(n); 4522 assert(in_hash, "node should be in igvn hash table"); 4523 tn->set_type(t_no_spec); 4524 igvn.hash_insert(n); 4525 igvn._worklist.push(n); // give it a chance to go away 4526 modified++; 4527 } 4528 } 4529 uint max = n->len(); 4530 for( uint i = 0; i < max; ++i ) { 4531 Node *m = n->in(i); 4532 if (not_a_node(m)) continue; 4533 worklist.push(m); 4534 } 4535 } 4536 // Drop the speculative part of all types in the igvn's type table 4537 igvn.remove_speculative_types(); 4538 if (modified > 0) { 4539 igvn.optimize(); 4540 } 4541 #ifdef ASSERT 4542 // Verify that after the IGVN is over no speculative type has resurfaced 4543 worklist.clear(); 4544 worklist.push(root()); 4545 for (uint next = 0; next < worklist.size(); ++next) { 4546 Node *n = worklist.at(next); 4547 const Type* t = igvn.type_or_null(n); 4548 assert((t == NULL) || (t == t->remove_speculative()), "no more speculative types"); 4549 if (n->is_Type()) { 4550 t = n->as_Type()->type(); 4551 assert(t == t->remove_speculative(), "no more speculative types"); 4552 } 4553 uint max = n->len(); 4554 for( uint i = 0; i < max; ++i ) { 4555 Node *m = n->in(i); 4556 if (not_a_node(m)) continue; 4557 worklist.push(m); 4558 } 4559 } 4560 igvn.check_no_speculative_types(); 4561 #endif 4562 } 4563 } 4564 4565 // Auxiliary method to support randomized stressing/fuzzing. 4566 // 4567 // This method can be called the arbitrary number of times, with current count 4568 // as the argument. The logic allows selecting a single candidate from the 4569 // running list of candidates as follows: 4570 // int count = 0; 4571 // Cand* selected = null; 4572 // while(cand = cand->next()) { 4573 // if (randomized_select(++count)) { 4574 // selected = cand; 4575 // } 4576 // } 4577 // 4578 // Including count equalizes the chances any candidate is "selected". 4579 // This is useful when we don't have the complete list of candidates to choose 4580 // from uniformly. In this case, we need to adjust the randomicity of the 4581 // selection, or else we will end up biasing the selection towards the latter 4582 // candidates. 4583 // 4584 // Quick back-envelope calculation shows that for the list of n candidates 4585 // the equal probability for the candidate to persist as "best" can be 4586 // achieved by replacing it with "next" k-th candidate with the probability 4587 // of 1/k. It can be easily shown that by the end of the run, the 4588 // probability for any candidate is converged to 1/n, thus giving the 4589 // uniform distribution among all the candidates. 4590 // 4591 // We don't care about the domain size as long as (RANDOMIZED_DOMAIN / count) is large. 4592 #define RANDOMIZED_DOMAIN_POW 29 4593 #define RANDOMIZED_DOMAIN (1 << RANDOMIZED_DOMAIN_POW) 4594 #define RANDOMIZED_DOMAIN_MASK ((1 << (RANDOMIZED_DOMAIN_POW + 1)) - 1) 4595 bool Compile::randomized_select(int count) { 4596 assert(count > 0, "only positive"); 4597 return (os::random() & RANDOMIZED_DOMAIN_MASK) < (RANDOMIZED_DOMAIN / count); 4598 } 4599 4600 CloneMap& Compile::clone_map() { return _clone_map; } 4601 void Compile::set_clone_map(Dict* d) { _clone_map._dict = d; } 4602 4603 void NodeCloneInfo::dump() const { 4604 tty->print(" {%d:%d} ", idx(), gen()); 4605 } 4606 4607 void CloneMap::clone(Node* old, Node* nnn, int gen) { 4608 uint64_t val = value(old->_idx); 4609 NodeCloneInfo cio(val); 4610 assert(val != 0, "old node should be in the map"); 4611 NodeCloneInfo cin(cio.idx(), gen + cio.gen()); 4612 insert(nnn->_idx, cin.get()); 4613 #ifndef PRODUCT 4614 if (is_debug()) { 4615 tty->print_cr("CloneMap::clone inserted node %d info {%d:%d} into CloneMap", nnn->_idx, cin.idx(), cin.gen()); 4616 } 4617 #endif 4618 } 4619 4620 void CloneMap::verify_insert_and_clone(Node* old, Node* nnn, int gen) { 4621 NodeCloneInfo cio(value(old->_idx)); 4622 if (cio.get() == 0) { 4623 cio.set(old->_idx, 0); 4624 insert(old->_idx, cio.get()); 4625 #ifndef PRODUCT 4626 if (is_debug()) { 4627 tty->print_cr("CloneMap::verify_insert_and_clone inserted node %d info {%d:%d} into CloneMap", old->_idx, cio.idx(), cio.gen()); 4628 } 4629 #endif 4630 } 4631 clone(old, nnn, gen); 4632 } 4633 4634 int CloneMap::max_gen() const { 4635 int g = 0; 4636 DictI di(_dict); 4637 for(; di.test(); ++di) { 4638 int t = gen(di._key); 4639 if (g < t) { 4640 g = t; 4641 #ifndef PRODUCT 4642 if (is_debug()) { 4643 tty->print_cr("CloneMap::max_gen() update max=%d from %d", g, _2_node_idx_t(di._key)); 4644 } 4645 #endif 4646 } 4647 } 4648 return g; 4649 } 4650 4651 void CloneMap::dump(node_idx_t key) const { 4652 uint64_t val = value(key); 4653 if (val != 0) { 4654 NodeCloneInfo ni(val); 4655 ni.dump(); 4656 } 4657 } 4658 4659 // Helper function for enforcing certain bytecodes to reexecute if 4660 // deoptimization happens 4661 static bool should_reexecute_implied_by_bytecode(JVMState *jvms, bool is_anewarray) { 4662 ciMethod* cur_method = jvms->method(); 4663 int cur_bci = jvms->bci(); 4664 if (cur_method != NULL && cur_bci != InvocationEntryBci) { 4665 Bytecodes::Code code = cur_method->java_code_at_bci(cur_bci); 4666 return Interpreter::bytecode_should_reexecute(code) || 4667 is_anewarray && code == Bytecodes::_multianewarray; 4668 // Reexecute _multianewarray bytecode which was replaced with 4669 // sequence of [a]newarray. See Parse::do_multianewarray(). 4670 // 4671 // Note: interpreter should not have it set since this optimization 4672 // is limited by dimensions and guarded by flag so in some cases 4673 // multianewarray() runtime calls will be generated and 4674 // the bytecode should not be reexecutes (stack will not be reset). 4675 } else 4676 return false; 4677 } 4678 4679 void Compile::add_safepoint_edges(SafePointNode* call, JVMState* youngest_jvms, bool can_prune_locals, uint stack_slots_not_pruned) { 4680 // do not scribble on the input jvms 4681 JVMState* out_jvms = youngest_jvms->clone_deep(C); 4682 call->set_jvms(out_jvms); // Start jvms list for call node 4683 4684 // For a known set of bytecodes, the interpreter should reexecute them if 4685 // deoptimization happens. We set the reexecute state for them here 4686 if (out_jvms->is_reexecute_undefined() && //don't change if already specified 4687 should_reexecute_implied_by_bytecode(out_jvms, call->is_AllocateArray())) { 4688 out_jvms->set_should_reexecute(true); //NOTE: youngest_jvms not changed 4689 } 4690 4691 // Presize the call: 4692 DEBUG_ONLY(uint non_debug_edges = call->req()); 4693 call->add_req_batch(top(), youngest_jvms->debug_depth()); 4694 assert(call->req() == non_debug_edges + youngest_jvms->debug_depth(), ""); 4695 4696 // Set up edges so that the call looks like this: 4697 // Call [state:] ctl io mem fptr retadr 4698 // [parms:] parm0 ... parmN 4699 // [root:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN 4700 // [...mid:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN [...] 4701 // [young:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN 4702 // Note that caller debug info precedes callee debug info. 4703 4704 // Fill pointer walks backwards from "young:" to "root:" in the diagram above: 4705 uint debug_ptr = call->req(); 4706 4707 // Loop over the map input edges associated with jvms, add them 4708 // to the call node, & reset all offsets to match call node array. 4709 for (JVMState* in_jvms = youngest_jvms; in_jvms != NULL; ) { 4710 uint debug_end = debug_ptr; 4711 uint debug_start = debug_ptr - in_jvms->debug_size(); 4712 debug_ptr = debug_start; // back up the ptr 4713 4714 uint p = debug_start; // walks forward in [debug_start, debug_end) 4715 uint j, k, l; 4716 SafePointNode* in_map = in_jvms->map(); 4717 out_jvms->set_map(call); 4718 4719 if (can_prune_locals) { 4720 assert(in_jvms->method() == out_jvms->method(), "sanity"); 4721 // If the current throw can reach an exception handler in this JVMS, 4722 // then we must keep everything live that can reach that handler. 4723 // As a quick and dirty approximation, we look for any handlers at all. 4724 if (in_jvms->method()->has_exception_handlers()) { 4725 can_prune_locals = false; 4726 } 4727 } 4728 4729 // Add the Locals 4730 k = in_jvms->locoff(); 4731 l = in_jvms->loc_size(); 4732 out_jvms->set_locoff(p); 4733 if (!can_prune_locals) { 4734 for (j = 0; j < l; j++) 4735 call->set_req(p++, in_map->in(k+j)); 4736 } else { 4737 p += l; // already set to top above by add_req_batch 4738 } 4739 4740 // Add the Expression Stack 4741 k = in_jvms->stkoff(); 4742 l = in_jvms->sp(); 4743 out_jvms->set_stkoff(p); 4744 if (!can_prune_locals) { 4745 for (j = 0; j < l; j++) 4746 call->set_req(p++, in_map->in(k+j)); 4747 } else if (can_prune_locals && stack_slots_not_pruned != 0) { 4748 // Divide stack into {S0,...,S1}, where S0 is set to top. 4749 uint s1 = stack_slots_not_pruned; 4750 stack_slots_not_pruned = 0; // for next iteration 4751 if (s1 > l) s1 = l; 4752 uint s0 = l - s1; 4753 p += s0; // skip the tops preinstalled by add_req_batch 4754 for (j = s0; j < l; j++) 4755 call->set_req(p++, in_map->in(k+j)); 4756 } else { 4757 p += l; // already set to top above by add_req_batch 4758 } 4759 4760 // Add the Monitors 4761 k = in_jvms->monoff(); 4762 l = in_jvms->mon_size(); 4763 out_jvms->set_monoff(p); 4764 for (j = 0; j < l; j++) 4765 call->set_req(p++, in_map->in(k+j)); 4766 4767 // Copy any scalar object fields. 4768 k = in_jvms->scloff(); 4769 l = in_jvms->scl_size(); 4770 out_jvms->set_scloff(p); 4771 for (j = 0; j < l; j++) 4772 call->set_req(p++, in_map->in(k+j)); 4773 4774 // Finish the new jvms. 4775 out_jvms->set_endoff(p); 4776 4777 assert(out_jvms->endoff() == debug_end, "fill ptr must match"); 4778 assert(out_jvms->depth() == in_jvms->depth(), "depth must match"); 4779 assert(out_jvms->loc_size() == in_jvms->loc_size(), "size must match"); 4780 assert(out_jvms->mon_size() == in_jvms->mon_size(), "size must match"); 4781 assert(out_jvms->scl_size() == in_jvms->scl_size(), "size must match"); 4782 assert(out_jvms->debug_size() == in_jvms->debug_size(), "size must match"); 4783 4784 // Update the two tail pointers in parallel. 4785 out_jvms = out_jvms->caller(); 4786 in_jvms = in_jvms->caller(); 4787 } 4788 4789 assert(debug_ptr == non_debug_edges, "debug info must fit exactly"); 4790 4791 // Test the correctness of JVMState::debug_xxx accessors: 4792 assert(call->jvms()->debug_start() == non_debug_edges, ""); 4793 assert(call->jvms()->debug_end() == call->req(), ""); 4794 assert(call->jvms()->debug_depth() == call->req() - non_debug_edges, ""); 4795 }