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 "gc/shared/barrierSet.hpp" 27 #include "gc/shared/c2/barrierSetC2.hpp" 28 #include "libadt/vectset.hpp" 29 #include "memory/allocation.inline.hpp" 30 #include "memory/resourceArea.hpp" 31 #include "opto/castnode.hpp" 32 #include "opto/cfgnode.hpp" 33 #include "opto/connode.hpp" 34 #include "opto/loopnode.hpp" 35 #include "opto/machnode.hpp" 36 #include "opto/matcher.hpp" 37 #include "opto/node.hpp" 38 #include "opto/opcodes.hpp" 39 #include "opto/regmask.hpp" 40 #include "opto/rootnode.hpp" 41 #include "opto/type.hpp" 42 #include "utilities/copy.hpp" 43 #include "utilities/macros.hpp" 44 45 class RegMask; 46 // #include "phase.hpp" 47 class PhaseTransform; 48 class PhaseGVN; 49 50 // Arena we are currently building Nodes in 51 const uint Node::NotAMachineReg = 0xffff0000; 52 53 #ifndef PRODUCT 54 extern int nodes_created; 55 #endif 56 #ifdef __clang__ 57 #pragma clang diagnostic push 58 #pragma GCC diagnostic ignored "-Wuninitialized" 59 #endif 60 61 #ifdef ASSERT 62 63 //-------------------------- construct_node------------------------------------ 64 // Set a breakpoint here to identify where a particular node index is built. 65 void Node::verify_construction() { 66 _debug_orig = NULL; 67 int old_debug_idx = Compile::debug_idx(); 68 int new_debug_idx = old_debug_idx+1; 69 if (new_debug_idx > 0) { 70 // Arrange that the lowest five decimal digits of _debug_idx 71 // will repeat those of _idx. In case this is somehow pathological, 72 // we continue to assign negative numbers (!) consecutively. 73 const int mod = 100000; 74 int bump = (int)(_idx - new_debug_idx) % mod; 75 if (bump < 0) bump += mod; 76 assert(bump >= 0 && bump < mod, ""); 77 new_debug_idx += bump; 78 } 79 Compile::set_debug_idx(new_debug_idx); 80 set_debug_idx( new_debug_idx ); 81 assert(Compile::current()->unique() < (INT_MAX - 1), "Node limit exceeded INT_MAX"); 82 assert(Compile::current()->live_nodes() < Compile::current()->max_node_limit(), "Live Node limit exceeded limit"); 83 if (BreakAtNode != 0 && (_debug_idx == BreakAtNode || (int)_idx == BreakAtNode)) { 84 tty->print_cr("BreakAtNode: _idx=%d _debug_idx=%d", _idx, _debug_idx); 85 BREAKPOINT; 86 } 87 #if OPTO_DU_ITERATOR_ASSERT 88 _last_del = NULL; 89 _del_tick = 0; 90 #endif 91 _hash_lock = 0; 92 } 93 94 95 // #ifdef ASSERT ... 96 97 #if OPTO_DU_ITERATOR_ASSERT 98 void DUIterator_Common::sample(const Node* node) { 99 _vdui = VerifyDUIterators; 100 _node = node; 101 _outcnt = node->_outcnt; 102 _del_tick = node->_del_tick; 103 _last = NULL; 104 } 105 106 void DUIterator_Common::verify(const Node* node, bool at_end_ok) { 107 assert(_node == node, "consistent iterator source"); 108 assert(_del_tick == node->_del_tick, "no unexpected deletions allowed"); 109 } 110 111 void DUIterator_Common::verify_resync() { 112 // Ensure that the loop body has just deleted the last guy produced. 113 const Node* node = _node; 114 // Ensure that at least one copy of the last-seen edge was deleted. 115 // Note: It is OK to delete multiple copies of the last-seen edge. 116 // Unfortunately, we have no way to verify that all the deletions delete 117 // that same edge. On this point we must use the Honor System. 118 assert(node->_del_tick >= _del_tick+1, "must have deleted an edge"); 119 assert(node->_last_del == _last, "must have deleted the edge just produced"); 120 // We liked this deletion, so accept the resulting outcnt and tick. 121 _outcnt = node->_outcnt; 122 _del_tick = node->_del_tick; 123 } 124 125 void DUIterator_Common::reset(const DUIterator_Common& that) { 126 if (this == &that) return; // ignore assignment to self 127 if (!_vdui) { 128 // We need to initialize everything, overwriting garbage values. 129 _last = that._last; 130 _vdui = that._vdui; 131 } 132 // Note: It is legal (though odd) for an iterator over some node x 133 // to be reassigned to iterate over another node y. Some doubly-nested 134 // progress loops depend on being able to do this. 135 const Node* node = that._node; 136 // Re-initialize everything, except _last. 137 _node = node; 138 _outcnt = node->_outcnt; 139 _del_tick = node->_del_tick; 140 } 141 142 void DUIterator::sample(const Node* node) { 143 DUIterator_Common::sample(node); // Initialize the assertion data. 144 _refresh_tick = 0; // No refreshes have happened, as yet. 145 } 146 147 void DUIterator::verify(const Node* node, bool at_end_ok) { 148 DUIterator_Common::verify(node, at_end_ok); 149 assert(_idx < node->_outcnt + (uint)at_end_ok, "idx in range"); 150 } 151 152 void DUIterator::verify_increment() { 153 if (_refresh_tick & 1) { 154 // We have refreshed the index during this loop. 155 // Fix up _idx to meet asserts. 156 if (_idx > _outcnt) _idx = _outcnt; 157 } 158 verify(_node, true); 159 } 160 161 void DUIterator::verify_resync() { 162 // Note: We do not assert on _outcnt, because insertions are OK here. 163 DUIterator_Common::verify_resync(); 164 // Make sure we are still in sync, possibly with no more out-edges: 165 verify(_node, true); 166 } 167 168 void DUIterator::reset(const DUIterator& that) { 169 if (this == &that) return; // self assignment is always a no-op 170 assert(that._refresh_tick == 0, "assign only the result of Node::outs()"); 171 assert(that._idx == 0, "assign only the result of Node::outs()"); 172 assert(_idx == that._idx, "already assigned _idx"); 173 if (!_vdui) { 174 // We need to initialize everything, overwriting garbage values. 175 sample(that._node); 176 } else { 177 DUIterator_Common::reset(that); 178 if (_refresh_tick & 1) { 179 _refresh_tick++; // Clear the "was refreshed" flag. 180 } 181 assert(_refresh_tick < 2*100000, "DU iteration must converge quickly"); 182 } 183 } 184 185 void DUIterator::refresh() { 186 DUIterator_Common::sample(_node); // Re-fetch assertion data. 187 _refresh_tick |= 1; // Set the "was refreshed" flag. 188 } 189 190 void DUIterator::verify_finish() { 191 // If the loop has killed the node, do not require it to re-run. 192 if (_node->_outcnt == 0) _refresh_tick &= ~1; 193 // If this assert triggers, it means that a loop used refresh_out_pos 194 // to re-synch an iteration index, but the loop did not correctly 195 // re-run itself, using a "while (progress)" construct. 196 // This iterator enforces the rule that you must keep trying the loop 197 // until it "runs clean" without any need for refreshing. 198 assert(!(_refresh_tick & 1), "the loop must run once with no refreshing"); 199 } 200 201 202 void DUIterator_Fast::verify(const Node* node, bool at_end_ok) { 203 DUIterator_Common::verify(node, at_end_ok); 204 Node** out = node->_out; 205 uint cnt = node->_outcnt; 206 assert(cnt == _outcnt, "no insertions allowed"); 207 assert(_outp >= out && _outp <= out + cnt - !at_end_ok, "outp in range"); 208 // This last check is carefully designed to work for NO_OUT_ARRAY. 209 } 210 211 void DUIterator_Fast::verify_limit() { 212 const Node* node = _node; 213 verify(node, true); 214 assert(_outp == node->_out + node->_outcnt, "limit still correct"); 215 } 216 217 void DUIterator_Fast::verify_resync() { 218 const Node* node = _node; 219 if (_outp == node->_out + _outcnt) { 220 // Note that the limit imax, not the pointer i, gets updated with the 221 // exact count of deletions. (For the pointer it's always "--i".) 222 assert(node->_outcnt+node->_del_tick == _outcnt+_del_tick, "no insertions allowed with deletion(s)"); 223 // This is a limit pointer, with a name like "imax". 224 // Fudge the _last field so that the common assert will be happy. 225 _last = (Node*) node->_last_del; 226 DUIterator_Common::verify_resync(); 227 } else { 228 assert(node->_outcnt < _outcnt, "no insertions allowed with deletion(s)"); 229 // A normal internal pointer. 230 DUIterator_Common::verify_resync(); 231 // Make sure we are still in sync, possibly with no more out-edges: 232 verify(node, true); 233 } 234 } 235 236 void DUIterator_Fast::verify_relimit(uint n) { 237 const Node* node = _node; 238 assert((int)n > 0, "use imax -= n only with a positive count"); 239 // This must be a limit pointer, with a name like "imax". 240 assert(_outp == node->_out + node->_outcnt, "apply -= only to a limit (imax)"); 241 // The reported number of deletions must match what the node saw. 242 assert(node->_del_tick == _del_tick + n, "must have deleted n edges"); 243 // Fudge the _last field so that the common assert will be happy. 244 _last = (Node*) node->_last_del; 245 DUIterator_Common::verify_resync(); 246 } 247 248 void DUIterator_Fast::reset(const DUIterator_Fast& that) { 249 assert(_outp == that._outp, "already assigned _outp"); 250 DUIterator_Common::reset(that); 251 } 252 253 void DUIterator_Last::verify(const Node* node, bool at_end_ok) { 254 // at_end_ok means the _outp is allowed to underflow by 1 255 _outp += at_end_ok; 256 DUIterator_Fast::verify(node, at_end_ok); // check _del_tick, etc. 257 _outp -= at_end_ok; 258 assert(_outp == (node->_out + node->_outcnt) - 1, "pointer must point to end of nodes"); 259 } 260 261 void DUIterator_Last::verify_limit() { 262 // Do not require the limit address to be resynched. 263 //verify(node, true); 264 assert(_outp == _node->_out, "limit still correct"); 265 } 266 267 void DUIterator_Last::verify_step(uint num_edges) { 268 assert((int)num_edges > 0, "need non-zero edge count for loop progress"); 269 _outcnt -= num_edges; 270 _del_tick += num_edges; 271 // Make sure we are still in sync, possibly with no more out-edges: 272 const Node* node = _node; 273 verify(node, true); 274 assert(node->_last_del == _last, "must have deleted the edge just produced"); 275 } 276 277 #endif //OPTO_DU_ITERATOR_ASSERT 278 279 280 #endif //ASSERT 281 282 283 // This constant used to initialize _out may be any non-null value. 284 // The value NULL is reserved for the top node only. 285 #define NO_OUT_ARRAY ((Node**)-1) 286 287 // Out-of-line code from node constructors. 288 // Executed only when extra debug info. is being passed around. 289 static void init_node_notes(Compile* C, int idx, Node_Notes* nn) { 290 C->set_node_notes_at(idx, nn); 291 } 292 293 // Shared initialization code. 294 inline int Node::Init(int req) { 295 Compile* C = Compile::current(); 296 int idx = C->next_unique(); 297 298 // Allocate memory for the necessary number of edges. 299 if (req > 0) { 300 // Allocate space for _in array to have double alignment. 301 _in = (Node **) ((char *) (C->node_arena()->Amalloc_D(req * sizeof(void*)))); 302 } 303 // If there are default notes floating around, capture them: 304 Node_Notes* nn = C->default_node_notes(); 305 if (nn != NULL) init_node_notes(C, idx, nn); 306 307 // Note: At this point, C is dead, 308 // and we begin to initialize the new Node. 309 310 _cnt = _max = req; 311 _outcnt = _outmax = 0; 312 _class_id = Class_Node; 313 _flags = 0; 314 _out = NO_OUT_ARRAY; 315 return idx; 316 } 317 318 //------------------------------Node------------------------------------------- 319 // Create a Node, with a given number of required edges. 320 Node::Node(uint req) 321 : _idx(Init(req)) 322 #ifdef ASSERT 323 , _parse_idx(_idx) 324 #endif 325 { 326 assert( req < Compile::current()->max_node_limit() - NodeLimitFudgeFactor, "Input limit exceeded" ); 327 debug_only( verify_construction() ); 328 NOT_PRODUCT(nodes_created++); 329 if (req == 0) { 330 _in = NULL; 331 } else { 332 Node** to = _in; 333 for(uint i = 0; i < req; i++) { 334 to[i] = NULL; 335 } 336 } 337 } 338 339 //------------------------------Node------------------------------------------- 340 Node::Node(Node *n0) 341 : _idx(Init(1)) 342 #ifdef ASSERT 343 , _parse_idx(_idx) 344 #endif 345 { 346 debug_only( verify_construction() ); 347 NOT_PRODUCT(nodes_created++); 348 assert( is_not_dead(n0), "can not use dead node"); 349 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); 350 } 351 352 //------------------------------Node------------------------------------------- 353 Node::Node(Node *n0, Node *n1) 354 : _idx(Init(2)) 355 #ifdef ASSERT 356 , _parse_idx(_idx) 357 #endif 358 { 359 debug_only( verify_construction() ); 360 NOT_PRODUCT(nodes_created++); 361 assert( is_not_dead(n0), "can not use dead node"); 362 assert( is_not_dead(n1), "can not use dead node"); 363 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); 364 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); 365 } 366 367 //------------------------------Node------------------------------------------- 368 Node::Node(Node *n0, Node *n1, Node *n2) 369 : _idx(Init(3)) 370 #ifdef ASSERT 371 , _parse_idx(_idx) 372 #endif 373 { 374 debug_only( verify_construction() ); 375 NOT_PRODUCT(nodes_created++); 376 assert( is_not_dead(n0), "can not use dead node"); 377 assert( is_not_dead(n1), "can not use dead node"); 378 assert( is_not_dead(n2), "can not use dead node"); 379 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); 380 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); 381 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); 382 } 383 384 //------------------------------Node------------------------------------------- 385 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3) 386 : _idx(Init(4)) 387 #ifdef ASSERT 388 , _parse_idx(_idx) 389 #endif 390 { 391 debug_only( verify_construction() ); 392 NOT_PRODUCT(nodes_created++); 393 assert( is_not_dead(n0), "can not use dead node"); 394 assert( is_not_dead(n1), "can not use dead node"); 395 assert( is_not_dead(n2), "can not use dead node"); 396 assert( is_not_dead(n3), "can not use dead node"); 397 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); 398 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); 399 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); 400 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); 401 } 402 403 //------------------------------Node------------------------------------------- 404 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3, Node *n4) 405 : _idx(Init(5)) 406 #ifdef ASSERT 407 , _parse_idx(_idx) 408 #endif 409 { 410 debug_only( verify_construction() ); 411 NOT_PRODUCT(nodes_created++); 412 assert( is_not_dead(n0), "can not use dead node"); 413 assert( is_not_dead(n1), "can not use dead node"); 414 assert( is_not_dead(n2), "can not use dead node"); 415 assert( is_not_dead(n3), "can not use dead node"); 416 assert( is_not_dead(n4), "can not use dead node"); 417 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); 418 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); 419 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); 420 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); 421 _in[4] = n4; if (n4 != NULL) n4->add_out((Node *)this); 422 } 423 424 //------------------------------Node------------------------------------------- 425 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3, 426 Node *n4, Node *n5) 427 : _idx(Init(6)) 428 #ifdef ASSERT 429 , _parse_idx(_idx) 430 #endif 431 { 432 debug_only( verify_construction() ); 433 NOT_PRODUCT(nodes_created++); 434 assert( is_not_dead(n0), "can not use dead node"); 435 assert( is_not_dead(n1), "can not use dead node"); 436 assert( is_not_dead(n2), "can not use dead node"); 437 assert( is_not_dead(n3), "can not use dead node"); 438 assert( is_not_dead(n4), "can not use dead node"); 439 assert( is_not_dead(n5), "can not use dead node"); 440 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); 441 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); 442 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); 443 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); 444 _in[4] = n4; if (n4 != NULL) n4->add_out((Node *)this); 445 _in[5] = n5; if (n5 != NULL) n5->add_out((Node *)this); 446 } 447 448 //------------------------------Node------------------------------------------- 449 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3, 450 Node *n4, Node *n5, Node *n6) 451 : _idx(Init(7)) 452 #ifdef ASSERT 453 , _parse_idx(_idx) 454 #endif 455 { 456 debug_only( verify_construction() ); 457 NOT_PRODUCT(nodes_created++); 458 assert( is_not_dead(n0), "can not use dead node"); 459 assert( is_not_dead(n1), "can not use dead node"); 460 assert( is_not_dead(n2), "can not use dead node"); 461 assert( is_not_dead(n3), "can not use dead node"); 462 assert( is_not_dead(n4), "can not use dead node"); 463 assert( is_not_dead(n5), "can not use dead node"); 464 assert( is_not_dead(n6), "can not use dead node"); 465 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); 466 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); 467 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); 468 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); 469 _in[4] = n4; if (n4 != NULL) n4->add_out((Node *)this); 470 _in[5] = n5; if (n5 != NULL) n5->add_out((Node *)this); 471 _in[6] = n6; if (n6 != NULL) n6->add_out((Node *)this); 472 } 473 474 #ifdef __clang__ 475 #pragma clang diagnostic pop 476 #endif 477 478 479 //------------------------------clone------------------------------------------ 480 // Clone a Node. 481 Node *Node::clone() const { 482 Compile* C = Compile::current(); 483 uint s = size_of(); // Size of inherited Node 484 Node *n = (Node*)C->node_arena()->Amalloc_D(size_of() + _max*sizeof(Node*)); 485 Copy::conjoint_words_to_lower((HeapWord*)this, (HeapWord*)n, s); 486 // Set the new input pointer array 487 n->_in = (Node**)(((char*)n)+s); 488 // Cannot share the old output pointer array, so kill it 489 n->_out = NO_OUT_ARRAY; 490 // And reset the counters to 0 491 n->_outcnt = 0; 492 n->_outmax = 0; 493 // Unlock this guy, since he is not in any hash table. 494 debug_only(n->_hash_lock = 0); 495 // Walk the old node's input list to duplicate its edges 496 uint i; 497 for( i = 0; i < len(); i++ ) { 498 Node *x = in(i); 499 n->_in[i] = x; 500 if (x != NULL) x->add_out(n); 501 } 502 if (is_macro()) 503 C->add_macro_node(n); 504 if (is_expensive()) 505 C->add_expensive_node(n); 506 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2(); 507 bs->register_potential_barrier_node(n); 508 // If the cloned node is a range check dependent CastII, add it to the list. 509 CastIINode* cast = n->isa_CastII(); 510 if (cast != NULL && cast->has_range_check()) { 511 C->add_range_check_cast(cast); 512 } 513 if (n->Opcode() == Op_Opaque4) { 514 C->add_opaque4_node(n); 515 } 516 517 n->set_idx(C->next_unique()); // Get new unique index as well 518 debug_only( n->verify_construction() ); 519 NOT_PRODUCT(nodes_created++); 520 // Do not patch over the debug_idx of a clone, because it makes it 521 // impossible to break on the clone's moment of creation. 522 //debug_only( n->set_debug_idx( debug_idx() ) ); 523 524 C->copy_node_notes_to(n, (Node*) this); 525 526 // MachNode clone 527 uint nopnds; 528 if (this->is_Mach() && (nopnds = this->as_Mach()->num_opnds()) > 0) { 529 MachNode *mach = n->as_Mach(); 530 MachNode *mthis = this->as_Mach(); 531 // Get address of _opnd_array. 532 // It should be the same offset since it is the clone of this node. 533 MachOper **from = mthis->_opnds; 534 MachOper **to = (MachOper **)((size_t)(&mach->_opnds) + 535 pointer_delta((const void*)from, 536 (const void*)(&mthis->_opnds), 1)); 537 mach->_opnds = to; 538 for ( uint i = 0; i < nopnds; ++i ) { 539 to[i] = from[i]->clone(); 540 } 541 } 542 // cloning CallNode may need to clone JVMState 543 if (n->is_Call()) { 544 n->as_Call()->clone_jvms(C); 545 } 546 if (n->is_SafePoint()) { 547 n->as_SafePoint()->clone_replaced_nodes(); 548 } 549 if (n->is_Load()) { 550 n->as_Load()->copy_barrier_info(this); 551 } 552 return n; // Return the clone 553 } 554 555 //---------------------------setup_is_top-------------------------------------- 556 // Call this when changing the top node, to reassert the invariants 557 // required by Node::is_top. See Compile::set_cached_top_node. 558 void Node::setup_is_top() { 559 if (this == (Node*)Compile::current()->top()) { 560 // This node has just become top. Kill its out array. 561 _outcnt = _outmax = 0; 562 _out = NULL; // marker value for top 563 assert(is_top(), "must be top"); 564 } else { 565 if (_out == NULL) _out = NO_OUT_ARRAY; 566 assert(!is_top(), "must not be top"); 567 } 568 } 569 570 //------------------------------~Node------------------------------------------ 571 // Fancy destructor; eagerly attempt to reclaim Node numberings and storage 572 void Node::destruct() { 573 // Eagerly reclaim unique Node numberings 574 Compile* compile = Compile::current(); 575 if ((uint)_idx+1 == compile->unique()) { 576 compile->set_unique(compile->unique()-1); 577 } 578 // Clear debug info: 579 Node_Notes* nn = compile->node_notes_at(_idx); 580 if (nn != NULL) nn->clear(); 581 // Walk the input array, freeing the corresponding output edges 582 _cnt = _max; // forget req/prec distinction 583 uint i; 584 for( i = 0; i < _max; i++ ) { 585 set_req(i, NULL); 586 //assert(def->out(def->outcnt()-1) == (Node *)this,"bad def-use hacking in reclaim"); 587 } 588 assert(outcnt() == 0, "deleting a node must not leave a dangling use"); 589 // See if the input array was allocated just prior to the object 590 int edge_size = _max*sizeof(void*); 591 int out_edge_size = _outmax*sizeof(void*); 592 char *edge_end = ((char*)_in) + edge_size; 593 char *out_array = (char*)(_out == NO_OUT_ARRAY? NULL: _out); 594 int node_size = size_of(); 595 596 // Free the output edge array 597 if (out_edge_size > 0) { 598 compile->node_arena()->Afree(out_array, out_edge_size); 599 } 600 601 // Free the input edge array and the node itself 602 if( edge_end == (char*)this ) { 603 // It was; free the input array and object all in one hit 604 #ifndef ASSERT 605 compile->node_arena()->Afree(_in,edge_size+node_size); 606 #endif 607 } else { 608 // Free just the input array 609 compile->node_arena()->Afree(_in,edge_size); 610 611 // Free just the object 612 #ifndef ASSERT 613 compile->node_arena()->Afree(this,node_size); 614 #endif 615 } 616 if (is_macro()) { 617 compile->remove_macro_node(this); 618 } 619 if (is_expensive()) { 620 compile->remove_expensive_node(this); 621 } 622 CastIINode* cast = isa_CastII(); 623 if (cast != NULL && cast->has_range_check()) { 624 compile->remove_range_check_cast(cast); 625 } 626 if (Opcode() == Op_Opaque4) { 627 compile->remove_opaque4_node(this); 628 } 629 630 if (is_SafePoint()) { 631 as_SafePoint()->delete_replaced_nodes(); 632 } 633 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2(); 634 bs->unregister_potential_barrier_node(this); 635 #ifdef ASSERT 636 // We will not actually delete the storage, but we'll make the node unusable. 637 *(address*)this = badAddress; // smash the C++ vtbl, probably 638 _in = _out = (Node**) badAddress; 639 _max = _cnt = _outmax = _outcnt = 0; 640 compile->remove_modified_node(this); 641 #endif 642 } 643 644 //------------------------------grow------------------------------------------- 645 // Grow the input array, making space for more edges 646 void Node::grow( uint len ) { 647 Arena* arena = Compile::current()->node_arena(); 648 uint new_max = _max; 649 if( new_max == 0 ) { 650 _max = 4; 651 _in = (Node**)arena->Amalloc(4*sizeof(Node*)); 652 Node** to = _in; 653 to[0] = NULL; 654 to[1] = NULL; 655 to[2] = NULL; 656 to[3] = NULL; 657 return; 658 } 659 while( new_max <= len ) new_max <<= 1; // Find next power-of-2 660 // Trimming to limit allows a uint8 to handle up to 255 edges. 661 // Previously I was using only powers-of-2 which peaked at 128 edges. 662 //if( new_max >= limit ) new_max = limit-1; 663 _in = (Node**)arena->Arealloc(_in, _max*sizeof(Node*), new_max*sizeof(Node*)); 664 Copy::zero_to_bytes(&_in[_max], (new_max-_max)*sizeof(Node*)); // NULL all new space 665 _max = new_max; // Record new max length 666 // This assertion makes sure that Node::_max is wide enough to 667 // represent the numerical value of new_max. 668 assert(_max == new_max && _max > len, "int width of _max is too small"); 669 } 670 671 //-----------------------------out_grow---------------------------------------- 672 // Grow the input array, making space for more edges 673 void Node::out_grow( uint len ) { 674 assert(!is_top(), "cannot grow a top node's out array"); 675 Arena* arena = Compile::current()->node_arena(); 676 uint new_max = _outmax; 677 if( new_max == 0 ) { 678 _outmax = 4; 679 _out = (Node **)arena->Amalloc(4*sizeof(Node*)); 680 return; 681 } 682 while( new_max <= len ) new_max <<= 1; // Find next power-of-2 683 // Trimming to limit allows a uint8 to handle up to 255 edges. 684 // Previously I was using only powers-of-2 which peaked at 128 edges. 685 //if( new_max >= limit ) new_max = limit-1; 686 assert(_out != NULL && _out != NO_OUT_ARRAY, "out must have sensible value"); 687 _out = (Node**)arena->Arealloc(_out,_outmax*sizeof(Node*),new_max*sizeof(Node*)); 688 //Copy::zero_to_bytes(&_out[_outmax], (new_max-_outmax)*sizeof(Node*)); // NULL all new space 689 _outmax = new_max; // Record new max length 690 // This assertion makes sure that Node::_max is wide enough to 691 // represent the numerical value of new_max. 692 assert(_outmax == new_max && _outmax > len, "int width of _outmax is too small"); 693 } 694 695 #ifdef ASSERT 696 //------------------------------is_dead---------------------------------------- 697 bool Node::is_dead() const { 698 // Mach and pinch point nodes may look like dead. 699 if( is_top() || is_Mach() || (Opcode() == Op_Node && _outcnt > 0) ) 700 return false; 701 for( uint i = 0; i < _max; i++ ) 702 if( _in[i] != NULL ) 703 return false; 704 dump(); 705 return true; 706 } 707 #endif 708 709 710 //------------------------------is_unreachable--------------------------------- 711 bool Node::is_unreachable(PhaseIterGVN &igvn) const { 712 assert(!is_Mach(), "doesn't work with MachNodes"); 713 return outcnt() == 0 || igvn.type(this) == Type::TOP || (in(0) != NULL && in(0)->is_top()); 714 } 715 716 //------------------------------add_req---------------------------------------- 717 // Add a new required input at the end 718 void Node::add_req( Node *n ) { 719 assert( is_not_dead(n), "can not use dead node"); 720 721 // Look to see if I can move precedence down one without reallocating 722 if( (_cnt >= _max) || (in(_max-1) != NULL) ) 723 grow( _max+1 ); 724 725 // Find a precedence edge to move 726 if( in(_cnt) != NULL ) { // Next precedence edge is busy? 727 uint i; 728 for( i=_cnt; i<_max; i++ ) 729 if( in(i) == NULL ) // Find the NULL at end of prec edge list 730 break; // There must be one, since we grew the array 731 _in[i] = in(_cnt); // Move prec over, making space for req edge 732 } 733 _in[_cnt++] = n; // Stuff over old prec edge 734 if (n != NULL) n->add_out((Node *)this); 735 } 736 737 //---------------------------add_req_batch------------------------------------- 738 // Add a new required input at the end 739 void Node::add_req_batch( Node *n, uint m ) { 740 assert( is_not_dead(n), "can not use dead node"); 741 // check various edge cases 742 if ((int)m <= 1) { 743 assert((int)m >= 0, "oob"); 744 if (m != 0) add_req(n); 745 return; 746 } 747 748 // Look to see if I can move precedence down one without reallocating 749 if( (_cnt+m) > _max || _in[_max-m] ) 750 grow( _max+m ); 751 752 // Find a precedence edge to move 753 if( _in[_cnt] != NULL ) { // Next precedence edge is busy? 754 uint i; 755 for( i=_cnt; i<_max; i++ ) 756 if( _in[i] == NULL ) // Find the NULL at end of prec edge list 757 break; // There must be one, since we grew the array 758 // Slide all the precs over by m positions (assume #prec << m). 759 Copy::conjoint_words_to_higher((HeapWord*)&_in[_cnt], (HeapWord*)&_in[_cnt+m], ((i-_cnt)*sizeof(Node*))); 760 } 761 762 // Stuff over the old prec edges 763 for(uint i=0; i<m; i++ ) { 764 _in[_cnt++] = n; 765 } 766 767 // Insert multiple out edges on the node. 768 if (n != NULL && !n->is_top()) { 769 for(uint i=0; i<m; i++ ) { 770 n->add_out((Node *)this); 771 } 772 } 773 } 774 775 //------------------------------del_req---------------------------------------- 776 // Delete the required edge and compact the edge array 777 void Node::del_req( uint idx ) { 778 assert( idx < _cnt, "oob"); 779 assert( !VerifyHashTableKeys || _hash_lock == 0, 780 "remove node from hash table before modifying it"); 781 // First remove corresponding def-use edge 782 Node *n = in(idx); 783 if (n != NULL) n->del_out((Node *)this); 784 _in[idx] = in(--_cnt); // Compact the array 785 // Avoid spec violation: Gap in prec edges. 786 close_prec_gap_at(_cnt); 787 Compile::current()->record_modified_node(this); 788 } 789 790 //------------------------------del_req_ordered-------------------------------- 791 // Delete the required edge and compact the edge array with preserved order 792 void Node::del_req_ordered( uint idx ) { 793 assert( idx < _cnt, "oob"); 794 assert( !VerifyHashTableKeys || _hash_lock == 0, 795 "remove node from hash table before modifying it"); 796 // First remove corresponding def-use edge 797 Node *n = in(idx); 798 if (n != NULL) n->del_out((Node *)this); 799 if (idx < --_cnt) { // Not last edge ? 800 Copy::conjoint_words_to_lower((HeapWord*)&_in[idx+1], (HeapWord*)&_in[idx], ((_cnt-idx)*sizeof(Node*))); 801 } 802 // Avoid spec violation: Gap in prec edges. 803 close_prec_gap_at(_cnt); 804 Compile::current()->record_modified_node(this); 805 } 806 807 //------------------------------ins_req---------------------------------------- 808 // Insert a new required input at the end 809 void Node::ins_req( uint idx, Node *n ) { 810 assert( is_not_dead(n), "can not use dead node"); 811 add_req(NULL); // Make space 812 assert( idx < _max, "Must have allocated enough space"); 813 // Slide over 814 if(_cnt-idx-1 > 0) { 815 Copy::conjoint_words_to_higher((HeapWord*)&_in[idx], (HeapWord*)&_in[idx+1], ((_cnt-idx-1)*sizeof(Node*))); 816 } 817 _in[idx] = n; // Stuff over old required edge 818 if (n != NULL) n->add_out((Node *)this); // Add reciprocal def-use edge 819 } 820 821 //-----------------------------find_edge--------------------------------------- 822 int Node::find_edge(Node* n) { 823 for (uint i = 0; i < len(); i++) { 824 if (_in[i] == n) return i; 825 } 826 return -1; 827 } 828 829 //----------------------------replace_edge------------------------------------- 830 int Node::replace_edge(Node* old, Node* neww) { 831 if (old == neww) return 0; // nothing to do 832 uint nrep = 0; 833 for (uint i = 0; i < len(); i++) { 834 if (in(i) == old) { 835 if (i < req()) { 836 set_req(i, neww); 837 } else { 838 assert(find_prec_edge(neww) == -1, "spec violation: duplicated prec edge (node %d -> %d)", _idx, neww->_idx); 839 set_prec(i, neww); 840 } 841 nrep++; 842 } 843 } 844 return nrep; 845 } 846 847 /** 848 * Replace input edges in the range pointing to 'old' node. 849 */ 850 int Node::replace_edges_in_range(Node* old, Node* neww, int start, int end) { 851 if (old == neww) return 0; // nothing to do 852 uint nrep = 0; 853 for (int i = start; i < end; i++) { 854 if (in(i) == old) { 855 set_req(i, neww); 856 nrep++; 857 } 858 } 859 return nrep; 860 } 861 862 //-------------------------disconnect_inputs----------------------------------- 863 // NULL out all inputs to eliminate incoming Def-Use edges. 864 // Return the number of edges between 'n' and 'this' 865 int Node::disconnect_inputs(Node *n, Compile* C) { 866 int edges_to_n = 0; 867 868 uint cnt = req(); 869 for( uint i = 0; i < cnt; ++i ) { 870 if( in(i) == 0 ) continue; 871 if( in(i) == n ) ++edges_to_n; 872 set_req(i, NULL); 873 } 874 // Remove precedence edges if any exist 875 // Note: Safepoints may have precedence edges, even during parsing 876 if( (req() != len()) && (in(req()) != NULL) ) { 877 uint max = len(); 878 for( uint i = 0; i < max; ++i ) { 879 if( in(i) == 0 ) continue; 880 if( in(i) == n ) ++edges_to_n; 881 set_prec(i, NULL); 882 } 883 } 884 885 // Node::destruct requires all out edges be deleted first 886 // debug_only(destruct();) // no reuse benefit expected 887 if (edges_to_n == 0) { 888 C->record_dead_node(_idx); 889 } 890 return edges_to_n; 891 } 892 893 //-----------------------------uncast--------------------------------------- 894 // %%% Temporary, until we sort out CheckCastPP vs. CastPP. 895 // Strip away casting. (It is depth-limited.) 896 // Optionally, keep casts with dependencies. 897 Node* Node::uncast(bool keep_deps) const { 898 // Should be inline: 899 //return is_ConstraintCast() ? uncast_helper(this) : (Node*) this; 900 if (is_ConstraintCast()) { 901 return uncast_helper(this, keep_deps); 902 } else { 903 return (Node*) this; 904 } 905 } 906 907 // Find out of current node that matches opcode. 908 Node* Node::find_out_with(int opcode) { 909 for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) { 910 Node* use = fast_out(i); 911 if (use->Opcode() == opcode) { 912 return use; 913 } 914 } 915 return NULL; 916 } 917 918 // Return true if the current node has an out that matches opcode. 919 bool Node::has_out_with(int opcode) { 920 return (find_out_with(opcode) != NULL); 921 } 922 923 // Return true if the current node has an out that matches any of the opcodes. 924 bool Node::has_out_with(int opcode1, int opcode2, int opcode3, int opcode4) { 925 for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) { 926 int opcode = fast_out(i)->Opcode(); 927 if (opcode == opcode1 || opcode == opcode2 || opcode == opcode3 || opcode == opcode4) { 928 return true; 929 } 930 } 931 return false; 932 } 933 934 935 //---------------------------uncast_helper------------------------------------- 936 Node* Node::uncast_helper(const Node* p, bool keep_deps) { 937 #ifdef ASSERT 938 uint depth_count = 0; 939 const Node* orig_p = p; 940 #endif 941 942 while (true) { 943 #ifdef ASSERT 944 if (depth_count >= K) { 945 orig_p->dump(4); 946 if (p != orig_p) 947 p->dump(1); 948 } 949 assert(depth_count++ < K, "infinite loop in Node::uncast_helper"); 950 #endif 951 if (p == NULL || p->req() != 2) { 952 break; 953 } else if (p->is_ConstraintCast()) { 954 if (keep_deps && p->as_ConstraintCast()->carry_dependency()) { 955 break; // stop at casts with dependencies 956 } 957 p = p->in(1); 958 } else { 959 break; 960 } 961 } 962 return (Node*) p; 963 } 964 965 //------------------------------add_prec--------------------------------------- 966 // Add a new precedence input. Precedence inputs are unordered, with 967 // duplicates removed and NULLs packed down at the end. 968 void Node::add_prec( Node *n ) { 969 assert( is_not_dead(n), "can not use dead node"); 970 971 // Check for NULL at end 972 if( _cnt >= _max || in(_max-1) ) 973 grow( _max+1 ); 974 975 // Find a precedence edge to move 976 uint i = _cnt; 977 while( in(i) != NULL ) { 978 if (in(i) == n) return; // Avoid spec violation: duplicated prec edge. 979 i++; 980 } 981 _in[i] = n; // Stuff prec edge over NULL 982 if ( n != NULL) n->add_out((Node *)this); // Add mirror edge 983 984 #ifdef ASSERT 985 while ((++i)<_max) { assert(_in[i] == NULL, "spec violation: Gap in prec edges (node %d)", _idx); } 986 #endif 987 } 988 989 //------------------------------rm_prec---------------------------------------- 990 // Remove a precedence input. Precedence inputs are unordered, with 991 // duplicates removed and NULLs packed down at the end. 992 void Node::rm_prec( uint j ) { 993 assert(j < _max, "oob: i=%d, _max=%d", j, _max); 994 assert(j >= _cnt, "not a precedence edge"); 995 if (_in[j] == NULL) return; // Avoid spec violation: Gap in prec edges. 996 _in[j]->del_out((Node *)this); 997 close_prec_gap_at(j); 998 } 999 1000 //------------------------------size_of---------------------------------------- 1001 uint Node::size_of() const { return sizeof(*this); } 1002 1003 //------------------------------ideal_reg-------------------------------------- 1004 uint Node::ideal_reg() const { return 0; } 1005 1006 //------------------------------jvms------------------------------------------- 1007 JVMState* Node::jvms() const { return NULL; } 1008 1009 #ifdef ASSERT 1010 //------------------------------jvms------------------------------------------- 1011 bool Node::verify_jvms(const JVMState* using_jvms) const { 1012 for (JVMState* jvms = this->jvms(); jvms != NULL; jvms = jvms->caller()) { 1013 if (jvms == using_jvms) return true; 1014 } 1015 return false; 1016 } 1017 1018 //------------------------------init_NodeProperty------------------------------ 1019 void Node::init_NodeProperty() { 1020 assert(_max_classes <= max_jushort, "too many NodeProperty classes"); 1021 assert(_max_flags <= max_jushort, "too many NodeProperty flags"); 1022 } 1023 #endif 1024 1025 //------------------------------format----------------------------------------- 1026 // Print as assembly 1027 void Node::format( PhaseRegAlloc *, outputStream *st ) const {} 1028 //------------------------------emit------------------------------------------- 1029 // Emit bytes starting at parameter 'ptr'. 1030 void Node::emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const {} 1031 //------------------------------size------------------------------------------- 1032 // Size of instruction in bytes 1033 uint Node::size(PhaseRegAlloc *ra_) const { return 0; } 1034 1035 //------------------------------CFG Construction------------------------------- 1036 // Nodes that end basic blocks, e.g. IfTrue/IfFalse, JumpProjNode, Root, 1037 // Goto and Return. 1038 const Node *Node::is_block_proj() const { return 0; } 1039 1040 // Minimum guaranteed type 1041 const Type *Node::bottom_type() const { return Type::BOTTOM; } 1042 1043 1044 //------------------------------raise_bottom_type------------------------------ 1045 // Get the worst-case Type output for this Node. 1046 void Node::raise_bottom_type(const Type* new_type) { 1047 if (is_Type()) { 1048 TypeNode *n = this->as_Type(); 1049 if (VerifyAliases) { 1050 assert(new_type->higher_equal_speculative(n->type()), "new type must refine old type"); 1051 } 1052 n->set_type(new_type); 1053 } else if (is_Load()) { 1054 LoadNode *n = this->as_Load(); 1055 if (VerifyAliases) { 1056 assert(new_type->higher_equal_speculative(n->type()), "new type must refine old type"); 1057 } 1058 n->set_type(new_type); 1059 } 1060 } 1061 1062 //------------------------------Identity--------------------------------------- 1063 // Return a node that the given node is equivalent to. 1064 Node* Node::Identity(PhaseGVN* phase) { 1065 return this; // Default to no identities 1066 } 1067 1068 //------------------------------Value------------------------------------------ 1069 // Compute a new Type for a node using the Type of the inputs. 1070 const Type* Node::Value(PhaseGVN* phase) const { 1071 return bottom_type(); // Default to worst-case Type 1072 } 1073 1074 //------------------------------Ideal------------------------------------------ 1075 // 1076 // 'Idealize' the graph rooted at this Node. 1077 // 1078 // In order to be efficient and flexible there are some subtle invariants 1079 // these Ideal calls need to hold. Running with '+VerifyIterativeGVN' checks 1080 // these invariants, although its too slow to have on by default. If you are 1081 // hacking an Ideal call, be sure to test with +VerifyIterativeGVN! 1082 // 1083 // The Ideal call almost arbitrarily reshape the graph rooted at the 'this' 1084 // pointer. If ANY change is made, it must return the root of the reshaped 1085 // graph - even if the root is the same Node. Example: swapping the inputs 1086 // to an AddINode gives the same answer and same root, but you still have to 1087 // return the 'this' pointer instead of NULL. 1088 // 1089 // You cannot return an OLD Node, except for the 'this' pointer. Use the 1090 // Identity call to return an old Node; basically if Identity can find 1091 // another Node have the Ideal call make no change and return NULL. 1092 // Example: AddINode::Ideal must check for add of zero; in this case it 1093 // returns NULL instead of doing any graph reshaping. 1094 // 1095 // You cannot modify any old Nodes except for the 'this' pointer. Due to 1096 // sharing there may be other users of the old Nodes relying on their current 1097 // semantics. Modifying them will break the other users. 1098 // Example: when reshape "(X+3)+4" into "X+7" you must leave the Node for 1099 // "X+3" unchanged in case it is shared. 1100 // 1101 // If you modify the 'this' pointer's inputs, you should use 1102 // 'set_req'. If you are making a new Node (either as the new root or 1103 // some new internal piece) you may use 'init_req' to set the initial 1104 // value. You can make a new Node with either 'new' or 'clone'. In 1105 // either case, def-use info is correctly maintained. 1106 // 1107 // Example: reshape "(X+3)+4" into "X+7": 1108 // set_req(1, in(1)->in(1)); 1109 // set_req(2, phase->intcon(7)); 1110 // return this; 1111 // Example: reshape "X*4" into "X<<2" 1112 // return new LShiftINode(in(1), phase->intcon(2)); 1113 // 1114 // You must call 'phase->transform(X)' on any new Nodes X you make, except 1115 // for the returned root node. Example: reshape "X*31" with "(X<<5)-X". 1116 // Node *shift=phase->transform(new LShiftINode(in(1),phase->intcon(5))); 1117 // return new AddINode(shift, in(1)); 1118 // 1119 // When making a Node for a constant use 'phase->makecon' or 'phase->intcon'. 1120 // These forms are faster than 'phase->transform(new ConNode())' and Do 1121 // The Right Thing with def-use info. 1122 // 1123 // You cannot bury the 'this' Node inside of a graph reshape. If the reshaped 1124 // graph uses the 'this' Node it must be the root. If you want a Node with 1125 // the same Opcode as the 'this' pointer use 'clone'. 1126 // 1127 Node *Node::Ideal(PhaseGVN *phase, bool can_reshape) { 1128 return NULL; // Default to being Ideal already 1129 } 1130 1131 // Some nodes have specific Ideal subgraph transformations only if they are 1132 // unique users of specific nodes. Such nodes should be put on IGVN worklist 1133 // for the transformations to happen. 1134 bool Node::has_special_unique_user() const { 1135 assert(outcnt() == 1, "match only for unique out"); 1136 Node* n = unique_out(); 1137 int op = Opcode(); 1138 if (this->is_Store()) { 1139 // Condition for back-to-back stores folding. 1140 return n->Opcode() == op && n->in(MemNode::Memory) == this; 1141 } else if (this->is_Load() || this->is_DecodeN() || this->is_Phi()) { 1142 // Condition for removing an unused LoadNode or DecodeNNode from the MemBarAcquire precedence input 1143 return n->Opcode() == Op_MemBarAcquire; 1144 } else if (op == Op_AddL) { 1145 // Condition for convL2I(addL(x,y)) ==> addI(convL2I(x),convL2I(y)) 1146 return n->Opcode() == Op_ConvL2I && n->in(1) == this; 1147 } else if (op == Op_SubI || op == Op_SubL) { 1148 // Condition for subI(x,subI(y,z)) ==> subI(addI(x,z),y) 1149 return n->Opcode() == op && n->in(2) == this; 1150 } else if (is_If() && (n->is_IfFalse() || n->is_IfTrue())) { 1151 // See IfProjNode::Identity() 1152 return true; 1153 } else { 1154 return BarrierSet::barrier_set()->barrier_set_c2()->has_special_unique_user(this); 1155 } 1156 }; 1157 1158 //--------------------------find_exact_control--------------------------------- 1159 // Skip Proj and CatchProj nodes chains. Check for Null and Top. 1160 Node* Node::find_exact_control(Node* ctrl) { 1161 if (ctrl == NULL && this->is_Region()) 1162 ctrl = this->as_Region()->is_copy(); 1163 1164 if (ctrl != NULL && ctrl->is_CatchProj()) { 1165 if (ctrl->as_CatchProj()->_con == CatchProjNode::fall_through_index) 1166 ctrl = ctrl->in(0); 1167 if (ctrl != NULL && !ctrl->is_top()) 1168 ctrl = ctrl->in(0); 1169 } 1170 1171 if (ctrl != NULL && ctrl->is_Proj()) 1172 ctrl = ctrl->in(0); 1173 1174 return ctrl; 1175 } 1176 1177 //--------------------------dominates------------------------------------------ 1178 // Helper function for MemNode::all_controls_dominate(). 1179 // Check if 'this' control node dominates or equal to 'sub' control node. 1180 // We already know that if any path back to Root or Start reaches 'this', 1181 // then all paths so, so this is a simple search for one example, 1182 // not an exhaustive search for a counterexample. 1183 bool Node::dominates(Node* sub, Node_List &nlist) { 1184 assert(this->is_CFG(), "expecting control"); 1185 assert(sub != NULL && sub->is_CFG(), "expecting control"); 1186 1187 // detect dead cycle without regions 1188 int iterations_without_region_limit = DominatorSearchLimit; 1189 1190 Node* orig_sub = sub; 1191 Node* dom = this; 1192 bool met_dom = false; 1193 nlist.clear(); 1194 1195 // Walk 'sub' backward up the chain to 'dom', watching for regions. 1196 // After seeing 'dom', continue up to Root or Start. 1197 // If we hit a region (backward split point), it may be a loop head. 1198 // Keep going through one of the region's inputs. If we reach the 1199 // same region again, go through a different input. Eventually we 1200 // will either exit through the loop head, or give up. 1201 // (If we get confused, break out and return a conservative 'false'.) 1202 while (sub != NULL) { 1203 if (sub->is_top()) break; // Conservative answer for dead code. 1204 if (sub == dom) { 1205 if (nlist.size() == 0) { 1206 // No Region nodes except loops were visited before and the EntryControl 1207 // path was taken for loops: it did not walk in a cycle. 1208 return true; 1209 } else if (met_dom) { 1210 break; // already met before: walk in a cycle 1211 } else { 1212 // Region nodes were visited. Continue walk up to Start or Root 1213 // to make sure that it did not walk in a cycle. 1214 met_dom = true; // first time meet 1215 iterations_without_region_limit = DominatorSearchLimit; // Reset 1216 } 1217 } 1218 if (sub->is_Start() || sub->is_Root()) { 1219 // Success if we met 'dom' along a path to Start or Root. 1220 // We assume there are no alternative paths that avoid 'dom'. 1221 // (This assumption is up to the caller to ensure!) 1222 return met_dom; 1223 } 1224 Node* up = sub->in(0); 1225 // Normalize simple pass-through regions and projections: 1226 up = sub->find_exact_control(up); 1227 // If sub == up, we found a self-loop. Try to push past it. 1228 if (sub == up && sub->is_Loop()) { 1229 // Take loop entry path on the way up to 'dom'. 1230 up = sub->in(1); // in(LoopNode::EntryControl); 1231 } else if (sub == up && sub->is_Region() && sub->req() != 3) { 1232 // Always take in(1) path on the way up to 'dom' for clone regions 1233 // (with only one input) or regions which merge > 2 paths 1234 // (usually used to merge fast/slow paths). 1235 up = sub->in(1); 1236 } else if (sub == up && sub->is_Region()) { 1237 // Try both paths for Regions with 2 input paths (it may be a loop head). 1238 // It could give conservative 'false' answer without information 1239 // which region's input is the entry path. 1240 iterations_without_region_limit = DominatorSearchLimit; // Reset 1241 1242 bool region_was_visited_before = false; 1243 // Was this Region node visited before? 1244 // If so, we have reached it because we accidentally took a 1245 // loop-back edge from 'sub' back into the body of the loop, 1246 // and worked our way up again to the loop header 'sub'. 1247 // So, take the first unexplored path on the way up to 'dom'. 1248 for (int j = nlist.size() - 1; j >= 0; j--) { 1249 intptr_t ni = (intptr_t)nlist.at(j); 1250 Node* visited = (Node*)(ni & ~1); 1251 bool visited_twice_already = ((ni & 1) != 0); 1252 if (visited == sub) { 1253 if (visited_twice_already) { 1254 // Visited 2 paths, but still stuck in loop body. Give up. 1255 return false; 1256 } 1257 // The Region node was visited before only once. 1258 // (We will repush with the low bit set, below.) 1259 nlist.remove(j); 1260 // We will find a new edge and re-insert. 1261 region_was_visited_before = true; 1262 break; 1263 } 1264 } 1265 1266 // Find an incoming edge which has not been seen yet; walk through it. 1267 assert(up == sub, ""); 1268 uint skip = region_was_visited_before ? 1 : 0; 1269 for (uint i = 1; i < sub->req(); i++) { 1270 Node* in = sub->in(i); 1271 if (in != NULL && !in->is_top() && in != sub) { 1272 if (skip == 0) { 1273 up = in; 1274 break; 1275 } 1276 --skip; // skip this nontrivial input 1277 } 1278 } 1279 1280 // Set 0 bit to indicate that both paths were taken. 1281 nlist.push((Node*)((intptr_t)sub + (region_was_visited_before ? 1 : 0))); 1282 } 1283 1284 if (up == sub) { 1285 break; // some kind of tight cycle 1286 } 1287 if (up == orig_sub && met_dom) { 1288 // returned back after visiting 'dom' 1289 break; // some kind of cycle 1290 } 1291 if (--iterations_without_region_limit < 0) { 1292 break; // dead cycle 1293 } 1294 sub = up; 1295 } 1296 1297 // Did not meet Root or Start node in pred. chain. 1298 // Conservative answer for dead code. 1299 return false; 1300 } 1301 1302 //------------------------------remove_dead_region----------------------------- 1303 // This control node is dead. Follow the subgraph below it making everything 1304 // using it dead as well. This will happen normally via the usual IterGVN 1305 // worklist but this call is more efficient. Do not update use-def info 1306 // inside the dead region, just at the borders. 1307 static void kill_dead_code( Node *dead, PhaseIterGVN *igvn ) { 1308 // Con's are a popular node to re-hit in the hash table again. 1309 if( dead->is_Con() ) return; 1310 1311 ResourceMark rm; 1312 Node_List nstack(Thread::current()->resource_area()); 1313 1314 Node *top = igvn->C->top(); 1315 nstack.push(dead); 1316 bool has_irreducible_loop = igvn->C->has_irreducible_loop(); 1317 1318 while (nstack.size() > 0) { 1319 dead = nstack.pop(); 1320 if (dead->Opcode() == Op_SafePoint) { 1321 dead->as_SafePoint()->disconnect_from_root(igvn); 1322 } 1323 if (dead->outcnt() > 0) { 1324 // Keep dead node on stack until all uses are processed. 1325 nstack.push(dead); 1326 // For all Users of the Dead... ;-) 1327 for (DUIterator_Last kmin, k = dead->last_outs(kmin); k >= kmin; ) { 1328 Node* use = dead->last_out(k); 1329 igvn->hash_delete(use); // Yank from hash table prior to mod 1330 if (use->in(0) == dead) { // Found another dead node 1331 assert (!use->is_Con(), "Control for Con node should be Root node."); 1332 use->set_req(0, top); // Cut dead edge to prevent processing 1333 nstack.push(use); // the dead node again. 1334 } else if (!has_irreducible_loop && // Backedge could be alive in irreducible loop 1335 use->is_Loop() && !use->is_Root() && // Don't kill Root (RootNode extends LoopNode) 1336 use->in(LoopNode::EntryControl) == dead) { // Dead loop if its entry is dead 1337 use->set_req(LoopNode::EntryControl, top); // Cut dead edge to prevent processing 1338 use->set_req(0, top); // Cut self edge 1339 nstack.push(use); 1340 } else { // Else found a not-dead user 1341 // Dead if all inputs are top or null 1342 bool dead_use = !use->is_Root(); // Keep empty graph alive 1343 for (uint j = 1; j < use->req(); j++) { 1344 Node* in = use->in(j); 1345 if (in == dead) { // Turn all dead inputs into TOP 1346 use->set_req(j, top); 1347 } else if (in != NULL && !in->is_top()) { 1348 dead_use = false; 1349 } 1350 } 1351 if (dead_use) { 1352 if (use->is_Region()) { 1353 use->set_req(0, top); // Cut self edge 1354 } 1355 nstack.push(use); 1356 } else { 1357 igvn->_worklist.push(use); 1358 } 1359 } 1360 // Refresh the iterator, since any number of kills might have happened. 1361 k = dead->last_outs(kmin); 1362 } 1363 } else { // (dead->outcnt() == 0) 1364 // Done with outputs. 1365 igvn->hash_delete(dead); 1366 igvn->_worklist.remove(dead); 1367 igvn->C->remove_modified_node(dead); 1368 igvn->set_type(dead, Type::TOP); 1369 if (dead->is_macro()) { 1370 igvn->C->remove_macro_node(dead); 1371 } 1372 if (dead->is_expensive()) { 1373 igvn->C->remove_expensive_node(dead); 1374 } 1375 CastIINode* cast = dead->isa_CastII(); 1376 if (cast != NULL && cast->has_range_check()) { 1377 igvn->C->remove_range_check_cast(cast); 1378 } 1379 if (dead->Opcode() == Op_Opaque4) { 1380 igvn->C->remove_opaque4_node(dead); 1381 } 1382 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2(); 1383 bs->unregister_potential_barrier_node(dead); 1384 igvn->C->record_dead_node(dead->_idx); 1385 // Kill all inputs to the dead guy 1386 for (uint i=0; i < dead->req(); i++) { 1387 Node *n = dead->in(i); // Get input to dead guy 1388 if (n != NULL && !n->is_top()) { // Input is valid? 1389 dead->set_req(i, top); // Smash input away 1390 if (n->outcnt() == 0) { // Input also goes dead? 1391 if (!n->is_Con()) 1392 nstack.push(n); // Clear it out as well 1393 } else if (n->outcnt() == 1 && 1394 n->has_special_unique_user()) { 1395 igvn->add_users_to_worklist( n ); 1396 } else if (n->outcnt() <= 2 && n->is_Store()) { 1397 // Push store's uses on worklist to enable folding optimization for 1398 // store/store and store/load to the same address. 1399 // The restriction (outcnt() <= 2) is the same as in set_req_X() 1400 // and remove_globally_dead_node(). 1401 igvn->add_users_to_worklist( n ); 1402 } else { 1403 BarrierSet::barrier_set()->barrier_set_c2()->enqueue_useful_gc_barrier(igvn, n); 1404 } 1405 } 1406 } 1407 } // (dead->outcnt() == 0) 1408 } // while (nstack.size() > 0) for outputs 1409 return; 1410 } 1411 1412 //------------------------------remove_dead_region----------------------------- 1413 bool Node::remove_dead_region(PhaseGVN *phase, bool can_reshape) { 1414 Node *n = in(0); 1415 if( !n ) return false; 1416 // Lost control into this guy? I.e., it became unreachable? 1417 // Aggressively kill all unreachable code. 1418 if (can_reshape && n->is_top()) { 1419 kill_dead_code(this, phase->is_IterGVN()); 1420 return false; // Node is dead. 1421 } 1422 1423 if( n->is_Region() && n->as_Region()->is_copy() ) { 1424 Node *m = n->nonnull_req(); 1425 set_req(0, m); 1426 return true; 1427 } 1428 return false; 1429 } 1430 1431 //------------------------------hash------------------------------------------- 1432 // Hash function over Nodes. 1433 uint Node::hash() const { 1434 uint sum = 0; 1435 for( uint i=0; i<_cnt; i++ ) // Add in all inputs 1436 sum = (sum<<1)-(uintptr_t)in(i); // Ignore embedded NULLs 1437 return (sum>>2) + _cnt + Opcode(); 1438 } 1439 1440 //------------------------------cmp-------------------------------------------- 1441 // Compare special parts of simple Nodes 1442 bool Node::cmp( const Node &n ) const { 1443 return true; // Must be same 1444 } 1445 1446 //------------------------------rematerialize----------------------------------- 1447 // Should we clone rather than spill this instruction? 1448 bool Node::rematerialize() const { 1449 if ( is_Mach() ) 1450 return this->as_Mach()->rematerialize(); 1451 else 1452 return (_flags & Flag_rematerialize) != 0; 1453 } 1454 1455 //------------------------------needs_anti_dependence_check--------------------- 1456 // Nodes which use memory without consuming it, hence need antidependences. 1457 bool Node::needs_anti_dependence_check() const { 1458 if (req() < 2 || (_flags & Flag_needs_anti_dependence_check) == 0) { 1459 return false; 1460 } 1461 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2(); 1462 if (!bs->needs_anti_dependence_check(this)) { 1463 return false; 1464 } 1465 return in(1)->bottom_type()->has_memory(); 1466 } 1467 1468 // Get an integer constant from a ConNode (or CastIINode). 1469 // Return a default value if there is no apparent constant here. 1470 const TypeInt* Node::find_int_type() const { 1471 if (this->is_Type()) { 1472 return this->as_Type()->type()->isa_int(); 1473 } else if (this->is_Con()) { 1474 assert(is_Mach(), "should be ConNode(TypeNode) or else a MachNode"); 1475 return this->bottom_type()->isa_int(); 1476 } 1477 return NULL; 1478 } 1479 1480 // Get a pointer constant from a ConstNode. 1481 // Returns the constant if it is a pointer ConstNode 1482 intptr_t Node::get_ptr() const { 1483 assert( Opcode() == Op_ConP, "" ); 1484 return ((ConPNode*)this)->type()->is_ptr()->get_con(); 1485 } 1486 1487 // Get a narrow oop constant from a ConNNode. 1488 intptr_t Node::get_narrowcon() const { 1489 assert( Opcode() == Op_ConN, "" ); 1490 return ((ConNNode*)this)->type()->is_narrowoop()->get_con(); 1491 } 1492 1493 // Get a long constant from a ConNode. 1494 // Return a default value if there is no apparent constant here. 1495 const TypeLong* Node::find_long_type() const { 1496 if (this->is_Type()) { 1497 return this->as_Type()->type()->isa_long(); 1498 } else if (this->is_Con()) { 1499 assert(is_Mach(), "should be ConNode(TypeNode) or else a MachNode"); 1500 return this->bottom_type()->isa_long(); 1501 } 1502 return NULL; 1503 } 1504 1505 1506 /** 1507 * Return a ptr type for nodes which should have it. 1508 */ 1509 const TypePtr* Node::get_ptr_type() const { 1510 const TypePtr* tp = this->bottom_type()->make_ptr(); 1511 #ifdef ASSERT 1512 if (tp == NULL) { 1513 this->dump(1); 1514 assert((tp != NULL), "unexpected node type"); 1515 } 1516 #endif 1517 return tp; 1518 } 1519 1520 // Get a double constant from a ConstNode. 1521 // Returns the constant if it is a double ConstNode 1522 jdouble Node::getd() const { 1523 assert( Opcode() == Op_ConD, "" ); 1524 return ((ConDNode*)this)->type()->is_double_constant()->getd(); 1525 } 1526 1527 // Get a float constant from a ConstNode. 1528 // Returns the constant if it is a float ConstNode 1529 jfloat Node::getf() const { 1530 assert( Opcode() == Op_ConF, "" ); 1531 return ((ConFNode*)this)->type()->is_float_constant()->getf(); 1532 } 1533 1534 #ifndef PRODUCT 1535 1536 //------------------------------find------------------------------------------ 1537 // Find a neighbor of this Node with the given _idx 1538 // If idx is negative, find its absolute value, following both _in and _out. 1539 static void find_recur(Compile* C, Node* &result, Node *n, int idx, bool only_ctrl, 1540 VectorSet* old_space, VectorSet* new_space ) { 1541 int node_idx = (idx >= 0) ? idx : -idx; 1542 if (NotANode(n)) return; // Gracefully handle NULL, -1, 0xabababab, etc. 1543 // Contained in new_space or old_space? Check old_arena first since it's mostly empty. 1544 VectorSet *v = C->old_arena()->contains(n) ? old_space : new_space; 1545 if( v->test(n->_idx) ) return; 1546 if( (int)n->_idx == node_idx 1547 debug_only(|| n->debug_idx() == node_idx) ) { 1548 if (result != NULL) 1549 tty->print("find: " INTPTR_FORMAT " and " INTPTR_FORMAT " both have idx==%d\n", 1550 (uintptr_t)result, (uintptr_t)n, node_idx); 1551 result = n; 1552 } 1553 v->set(n->_idx); 1554 for( uint i=0; i<n->len(); i++ ) { 1555 if( only_ctrl && !(n->is_Region()) && (n->Opcode() != Op_Root) && (i != TypeFunc::Control) ) continue; 1556 find_recur(C, result, n->in(i), idx, only_ctrl, old_space, new_space ); 1557 } 1558 // Search along forward edges also: 1559 if (idx < 0 && !only_ctrl) { 1560 for( uint j=0; j<n->outcnt(); j++ ) { 1561 find_recur(C, result, n->raw_out(j), idx, only_ctrl, old_space, new_space ); 1562 } 1563 } 1564 #ifdef ASSERT 1565 // Search along debug_orig edges last, checking for cycles 1566 Node* orig = n->debug_orig(); 1567 if (orig != NULL) { 1568 do { 1569 if (NotANode(orig)) break; 1570 find_recur(C, result, orig, idx, only_ctrl, old_space, new_space ); 1571 orig = orig->debug_orig(); 1572 } while (orig != NULL && orig != n->debug_orig()); 1573 } 1574 #endif //ASSERT 1575 } 1576 1577 // call this from debugger: 1578 Node* find_node(Node* n, int idx) { 1579 return n->find(idx); 1580 } 1581 1582 //------------------------------find------------------------------------------- 1583 Node* Node::find(int idx) const { 1584 ResourceArea *area = Thread::current()->resource_area(); 1585 VectorSet old_space(area), new_space(area); 1586 Node* result = NULL; 1587 find_recur(Compile::current(), result, (Node*) this, idx, false, &old_space, &new_space ); 1588 return result; 1589 } 1590 1591 //------------------------------find_ctrl-------------------------------------- 1592 // Find an ancestor to this node in the control history with given _idx 1593 Node* Node::find_ctrl(int idx) const { 1594 ResourceArea *area = Thread::current()->resource_area(); 1595 VectorSet old_space(area), new_space(area); 1596 Node* result = NULL; 1597 find_recur(Compile::current(), result, (Node*) this, idx, true, &old_space, &new_space ); 1598 return result; 1599 } 1600 #endif 1601 1602 1603 1604 #ifndef PRODUCT 1605 1606 // -----------------------------Name------------------------------------------- 1607 extern const char *NodeClassNames[]; 1608 const char *Node::Name() const { return NodeClassNames[Opcode()]; } 1609 1610 static bool is_disconnected(const Node* n) { 1611 for (uint i = 0; i < n->req(); i++) { 1612 if (n->in(i) != NULL) return false; 1613 } 1614 return true; 1615 } 1616 1617 #ifdef ASSERT 1618 static void dump_orig(Node* orig, outputStream *st) { 1619 Compile* C = Compile::current(); 1620 if (NotANode(orig)) orig = NULL; 1621 if (orig != NULL && !C->node_arena()->contains(orig)) orig = NULL; 1622 if (orig == NULL) return; 1623 st->print(" !orig="); 1624 Node* fast = orig->debug_orig(); // tortoise & hare algorithm to detect loops 1625 if (NotANode(fast)) fast = NULL; 1626 while (orig != NULL) { 1627 bool discon = is_disconnected(orig); // if discon, print [123] else 123 1628 if (discon) st->print("["); 1629 if (!Compile::current()->node_arena()->contains(orig)) 1630 st->print("o"); 1631 st->print("%d", orig->_idx); 1632 if (discon) st->print("]"); 1633 orig = orig->debug_orig(); 1634 if (NotANode(orig)) orig = NULL; 1635 if (orig != NULL && !C->node_arena()->contains(orig)) orig = NULL; 1636 if (orig != NULL) st->print(","); 1637 if (fast != NULL) { 1638 // Step fast twice for each single step of orig: 1639 fast = fast->debug_orig(); 1640 if (NotANode(fast)) fast = NULL; 1641 if (fast != NULL && fast != orig) { 1642 fast = fast->debug_orig(); 1643 if (NotANode(fast)) fast = NULL; 1644 } 1645 if (fast == orig) { 1646 st->print("..."); 1647 break; 1648 } 1649 } 1650 } 1651 } 1652 1653 void Node::set_debug_orig(Node* orig) { 1654 _debug_orig = orig; 1655 if (BreakAtNode == 0) return; 1656 if (NotANode(orig)) orig = NULL; 1657 int trip = 10; 1658 while (orig != NULL) { 1659 if (orig->debug_idx() == BreakAtNode || (int)orig->_idx == BreakAtNode) { 1660 tty->print_cr("BreakAtNode: _idx=%d _debug_idx=%d orig._idx=%d orig._debug_idx=%d", 1661 this->_idx, this->debug_idx(), orig->_idx, orig->debug_idx()); 1662 BREAKPOINT; 1663 } 1664 orig = orig->debug_orig(); 1665 if (NotANode(orig)) orig = NULL; 1666 if (trip-- <= 0) break; 1667 } 1668 } 1669 #endif //ASSERT 1670 1671 //------------------------------dump------------------------------------------ 1672 // Dump a Node 1673 void Node::dump(const char* suffix, bool mark, outputStream *st) const { 1674 Compile* C = Compile::current(); 1675 bool is_new = C->node_arena()->contains(this); 1676 C->_in_dump_cnt++; 1677 st->print("%c%d%s\t%s\t=== ", is_new ? ' ' : 'o', _idx, mark ? " >" : "", Name()); 1678 1679 // Dump the required and precedence inputs 1680 dump_req(st); 1681 dump_prec(st); 1682 // Dump the outputs 1683 dump_out(st); 1684 1685 if (is_disconnected(this)) { 1686 #ifdef ASSERT 1687 st->print(" [%d]",debug_idx()); 1688 dump_orig(debug_orig(), st); 1689 #endif 1690 st->cr(); 1691 C->_in_dump_cnt--; 1692 return; // don't process dead nodes 1693 } 1694 1695 if (C->clone_map().value(_idx) != 0) { 1696 C->clone_map().dump(_idx); 1697 } 1698 // Dump node-specific info 1699 dump_spec(st); 1700 #ifdef ASSERT 1701 // Dump the non-reset _debug_idx 1702 if (Verbose && WizardMode) { 1703 st->print(" [%d]",debug_idx()); 1704 } 1705 #endif 1706 1707 const Type *t = bottom_type(); 1708 1709 if (t != NULL && (t->isa_instptr() || t->isa_klassptr())) { 1710 const TypeInstPtr *toop = t->isa_instptr(); 1711 const TypeKlassPtr *tkls = t->isa_klassptr(); 1712 ciKlass* klass = toop ? toop->klass() : (tkls ? tkls->klass() : NULL ); 1713 if (klass && klass->is_loaded() && klass->is_interface()) { 1714 st->print(" Interface:"); 1715 } else if (toop) { 1716 st->print(" Oop:"); 1717 } else if (tkls) { 1718 st->print(" Klass:"); 1719 } 1720 t->dump_on(st); 1721 } else if (t == Type::MEMORY) { 1722 st->print(" Memory:"); 1723 MemNode::dump_adr_type(this, adr_type(), st); 1724 } else if (Verbose || WizardMode) { 1725 st->print(" Type:"); 1726 if (t) { 1727 t->dump_on(st); 1728 } else { 1729 st->print("no type"); 1730 } 1731 } else if (t->isa_vect() && this->is_MachSpillCopy()) { 1732 // Dump MachSpillcopy vector type. 1733 t->dump_on(st); 1734 } 1735 if (is_new) { 1736 debug_only(dump_orig(debug_orig(), st)); 1737 Node_Notes* nn = C->node_notes_at(_idx); 1738 if (nn != NULL && !nn->is_clear()) { 1739 if (nn->jvms() != NULL) { 1740 st->print(" !jvms:"); 1741 nn->jvms()->dump_spec(st); 1742 } 1743 } 1744 } 1745 if (suffix) st->print("%s", suffix); 1746 C->_in_dump_cnt--; 1747 } 1748 1749 //------------------------------dump_req-------------------------------------- 1750 void Node::dump_req(outputStream *st) const { 1751 // Dump the required input edges 1752 for (uint i = 0; i < req(); i++) { // For all required inputs 1753 Node* d = in(i); 1754 if (d == NULL) { 1755 st->print("_ "); 1756 } else if (NotANode(d)) { 1757 st->print("NotANode "); // uninitialized, sentinel, garbage, etc. 1758 } else { 1759 st->print("%c%d ", Compile::current()->node_arena()->contains(d) ? ' ' : 'o', d->_idx); 1760 } 1761 } 1762 } 1763 1764 1765 //------------------------------dump_prec------------------------------------- 1766 void Node::dump_prec(outputStream *st) const { 1767 // Dump the precedence edges 1768 int any_prec = 0; 1769 for (uint i = req(); i < len(); i++) { // For all precedence inputs 1770 Node* p = in(i); 1771 if (p != NULL) { 1772 if (!any_prec++) st->print(" |"); 1773 if (NotANode(p)) { st->print("NotANode "); continue; } 1774 st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx); 1775 } 1776 } 1777 } 1778 1779 //------------------------------dump_out-------------------------------------- 1780 void Node::dump_out(outputStream *st) const { 1781 // Delimit the output edges 1782 st->print(" [["); 1783 // Dump the output edges 1784 for (uint i = 0; i < _outcnt; i++) { // For all outputs 1785 Node* u = _out[i]; 1786 if (u == NULL) { 1787 st->print("_ "); 1788 } else if (NotANode(u)) { 1789 st->print("NotANode "); 1790 } else { 1791 st->print("%c%d ", Compile::current()->node_arena()->contains(u) ? ' ' : 'o', u->_idx); 1792 } 1793 } 1794 st->print("]] "); 1795 } 1796 1797 //----------------------------collect_nodes_i---------------------------------- 1798 // Collects nodes from an Ideal graph, starting from a given start node and 1799 // moving in a given direction until a certain depth (distance from the start 1800 // node) is reached. Duplicates are ignored. 1801 // Arguments: 1802 // nstack: the nodes are collected into this array. 1803 // start: the node at which to start collecting. 1804 // direction: if this is a positive number, collect input nodes; if it is 1805 // a negative number, collect output nodes. 1806 // depth: collect nodes up to this distance from the start node. 1807 // include_start: whether to include the start node in the result collection. 1808 // only_ctrl: whether to regard control edges only during traversal. 1809 // only_data: whether to regard data edges only during traversal. 1810 static void collect_nodes_i(GrowableArray<Node*> *nstack, const Node* start, int direction, uint depth, bool include_start, bool only_ctrl, bool only_data) { 1811 Node* s = (Node*) start; // remove const 1812 nstack->append(s); 1813 int begin = 0; 1814 int end = 0; 1815 for(uint i = 0; i < depth; i++) { 1816 end = nstack->length(); 1817 for(int j = begin; j < end; j++) { 1818 Node* tp = nstack->at(j); 1819 uint limit = direction > 0 ? tp->len() : tp->outcnt(); 1820 for(uint k = 0; k < limit; k++) { 1821 Node* n = direction > 0 ? tp->in(k) : tp->raw_out(k); 1822 1823 if (NotANode(n)) continue; 1824 // do not recurse through top or the root (would reach unrelated stuff) 1825 if (n->is_Root() || n->is_top()) continue; 1826 if (only_ctrl && !n->is_CFG()) continue; 1827 if (only_data && n->is_CFG()) continue; 1828 1829 bool on_stack = nstack->contains(n); 1830 if (!on_stack) { 1831 nstack->append(n); 1832 } 1833 } 1834 } 1835 begin = end; 1836 } 1837 if (!include_start) { 1838 nstack->remove(s); 1839 } 1840 } 1841 1842 //------------------------------dump_nodes------------------------------------- 1843 static void dump_nodes(const Node* start, int d, bool only_ctrl) { 1844 if (NotANode(start)) return; 1845 1846 GrowableArray <Node *> nstack(Compile::current()->live_nodes()); 1847 collect_nodes_i(&nstack, start, d, (uint) ABS(d), true, only_ctrl, false); 1848 1849 int end = nstack.length(); 1850 if (d > 0) { 1851 for(int j = end-1; j >= 0; j--) { 1852 nstack.at(j)->dump(); 1853 } 1854 } else { 1855 for(int j = 0; j < end; j++) { 1856 nstack.at(j)->dump(); 1857 } 1858 } 1859 } 1860 1861 //------------------------------dump------------------------------------------- 1862 void Node::dump(int d) const { 1863 dump_nodes(this, d, false); 1864 } 1865 1866 //------------------------------dump_ctrl-------------------------------------- 1867 // Dump a Node's control history to depth 1868 void Node::dump_ctrl(int d) const { 1869 dump_nodes(this, d, true); 1870 } 1871 1872 //-----------------------------dump_compact------------------------------------ 1873 void Node::dump_comp() const { 1874 this->dump_comp("\n"); 1875 } 1876 1877 //-----------------------------dump_compact------------------------------------ 1878 // Dump a Node in compact representation, i.e., just print its name and index. 1879 // Nodes can specify additional specifics to print in compact representation by 1880 // implementing dump_compact_spec. 1881 void Node::dump_comp(const char* suffix, outputStream *st) const { 1882 Compile* C = Compile::current(); 1883 C->_in_dump_cnt++; 1884 st->print("%s(%d)", Name(), _idx); 1885 this->dump_compact_spec(st); 1886 if (suffix) { 1887 st->print("%s", suffix); 1888 } 1889 C->_in_dump_cnt--; 1890 } 1891 1892 //----------------------------dump_related------------------------------------- 1893 // Dump a Node's related nodes - the notion of "related" depends on the Node at 1894 // hand and is determined by the implementation of the virtual method rel. 1895 void Node::dump_related() const { 1896 Compile* C = Compile::current(); 1897 GrowableArray <Node *> in_rel(C->unique()); 1898 GrowableArray <Node *> out_rel(C->unique()); 1899 this->related(&in_rel, &out_rel, false); 1900 for (int i = in_rel.length() - 1; i >= 0; i--) { 1901 in_rel.at(i)->dump(); 1902 } 1903 this->dump("\n", true); 1904 for (int i = 0; i < out_rel.length(); i++) { 1905 out_rel.at(i)->dump(); 1906 } 1907 } 1908 1909 //----------------------------dump_related------------------------------------- 1910 // Dump a Node's related nodes up to a given depth (distance from the start 1911 // node). 1912 // Arguments: 1913 // d_in: depth for input nodes. 1914 // d_out: depth for output nodes (note: this also is a positive number). 1915 void Node::dump_related(uint d_in, uint d_out) const { 1916 Compile* C = Compile::current(); 1917 GrowableArray <Node *> in_rel(C->unique()); 1918 GrowableArray <Node *> out_rel(C->unique()); 1919 1920 // call collect_nodes_i directly 1921 collect_nodes_i(&in_rel, this, 1, d_in, false, false, false); 1922 collect_nodes_i(&out_rel, this, -1, d_out, false, false, false); 1923 1924 for (int i = in_rel.length() - 1; i >= 0; i--) { 1925 in_rel.at(i)->dump(); 1926 } 1927 this->dump("\n", true); 1928 for (int i = 0; i < out_rel.length(); i++) { 1929 out_rel.at(i)->dump(); 1930 } 1931 } 1932 1933 //------------------------dump_related_compact--------------------------------- 1934 // Dump a Node's related nodes in compact representation. The notion of 1935 // "related" depends on the Node at hand and is determined by the implementation 1936 // of the virtual method rel. 1937 void Node::dump_related_compact() const { 1938 Compile* C = Compile::current(); 1939 GrowableArray <Node *> in_rel(C->unique()); 1940 GrowableArray <Node *> out_rel(C->unique()); 1941 this->related(&in_rel, &out_rel, true); 1942 int n_in = in_rel.length(); 1943 int n_out = out_rel.length(); 1944 1945 this->dump_comp(n_in == 0 ? "\n" : " "); 1946 for (int i = 0; i < n_in; i++) { 1947 in_rel.at(i)->dump_comp(i == n_in - 1 ? "\n" : " "); 1948 } 1949 for (int i = 0; i < n_out; i++) { 1950 out_rel.at(i)->dump_comp(i == n_out - 1 ? "\n" : " "); 1951 } 1952 } 1953 1954 //------------------------------related---------------------------------------- 1955 // Collect a Node's related nodes. The default behaviour just collects the 1956 // inputs and outputs at depth 1, including both control and data flow edges, 1957 // regardless of whether the presentation is compact or not. For data nodes, 1958 // the default is to collect all data inputs (till level 1 if compact), and 1959 // outputs till level 1. 1960 void Node::related(GrowableArray<Node*> *in_rel, GrowableArray<Node*> *out_rel, bool compact) const { 1961 if (this->is_CFG()) { 1962 collect_nodes_i(in_rel, this, 1, 1, false, false, false); 1963 collect_nodes_i(out_rel, this, -1, 1, false, false, false); 1964 } else { 1965 if (compact) { 1966 this->collect_nodes(in_rel, 1, false, true); 1967 } else { 1968 this->collect_nodes_in_all_data(in_rel, false); 1969 } 1970 this->collect_nodes(out_rel, -1, false, false); 1971 } 1972 } 1973 1974 //---------------------------collect_nodes------------------------------------- 1975 // An entry point to the low-level node collection facility, to start from a 1976 // given node in the graph. The start node is by default not included in the 1977 // result. 1978 // Arguments: 1979 // ns: collect the nodes into this data structure. 1980 // d: the depth (distance from start node) to which nodes should be 1981 // collected. A value >0 indicates input nodes, a value <0, output 1982 // nodes. 1983 // ctrl: include only control nodes. 1984 // data: include only data nodes. 1985 void Node::collect_nodes(GrowableArray<Node*> *ns, int d, bool ctrl, bool data) const { 1986 if (ctrl && data) { 1987 // ignore nonsensical combination 1988 return; 1989 } 1990 collect_nodes_i(ns, this, d, (uint) ABS(d), false, ctrl, data); 1991 } 1992 1993 //--------------------------collect_nodes_in----------------------------------- 1994 static void collect_nodes_in(Node* start, GrowableArray<Node*> *ns, bool primary_is_data, bool collect_secondary) { 1995 // The maximum depth is determined using a BFS that visits all primary (data 1996 // or control) inputs and increments the depth at each level. 1997 uint d_in = 0; 1998 GrowableArray<Node*> nodes(Compile::current()->unique()); 1999 nodes.push(start); 2000 int nodes_at_current_level = 1; 2001 int n_idx = 0; 2002 while (nodes_at_current_level > 0) { 2003 // Add all primary inputs reachable from the current level to the list, and 2004 // increase the depth if there were any. 2005 int nodes_at_next_level = 0; 2006 bool nodes_added = false; 2007 while (nodes_at_current_level > 0) { 2008 nodes_at_current_level--; 2009 Node* current = nodes.at(n_idx++); 2010 for (uint i = 0; i < current->len(); i++) { 2011 Node* n = current->in(i); 2012 if (NotANode(n)) { 2013 continue; 2014 } 2015 if ((primary_is_data && n->is_CFG()) || (!primary_is_data && !n->is_CFG())) { 2016 continue; 2017 } 2018 if (!nodes.contains(n)) { 2019 nodes.push(n); 2020 nodes_added = true; 2021 nodes_at_next_level++; 2022 } 2023 } 2024 } 2025 if (nodes_added) { 2026 d_in++; 2027 } 2028 nodes_at_current_level = nodes_at_next_level; 2029 } 2030 start->collect_nodes(ns, d_in, !primary_is_data, primary_is_data); 2031 if (collect_secondary) { 2032 // Now, iterate over the secondary nodes in ns and add the respective 2033 // boundary reachable from them. 2034 GrowableArray<Node*> sns(Compile::current()->unique()); 2035 for (GrowableArrayIterator<Node*> it = ns->begin(); it != ns->end(); ++it) { 2036 Node* n = *it; 2037 n->collect_nodes(&sns, 1, primary_is_data, !primary_is_data); 2038 for (GrowableArrayIterator<Node*> d = sns.begin(); d != sns.end(); ++d) { 2039 ns->append_if_missing(*d); 2040 } 2041 sns.clear(); 2042 } 2043 } 2044 } 2045 2046 //---------------------collect_nodes_in_all_data------------------------------- 2047 // Collect the entire data input graph. Include the control boundary if 2048 // requested. 2049 // Arguments: 2050 // ns: collect the nodes into this data structure. 2051 // ctrl: if true, include the control boundary. 2052 void Node::collect_nodes_in_all_data(GrowableArray<Node*> *ns, bool ctrl) const { 2053 collect_nodes_in((Node*) this, ns, true, ctrl); 2054 } 2055 2056 //--------------------------collect_nodes_in_all_ctrl-------------------------- 2057 // Collect the entire control input graph. Include the data boundary if 2058 // requested. 2059 // ns: collect the nodes into this data structure. 2060 // data: if true, include the control boundary. 2061 void Node::collect_nodes_in_all_ctrl(GrowableArray<Node*> *ns, bool data) const { 2062 collect_nodes_in((Node*) this, ns, false, data); 2063 } 2064 2065 //------------------collect_nodes_out_all_ctrl_boundary------------------------ 2066 // Collect the entire output graph until hitting control node boundaries, and 2067 // include those. 2068 void Node::collect_nodes_out_all_ctrl_boundary(GrowableArray<Node*> *ns) const { 2069 // Perform a BFS and stop at control nodes. 2070 GrowableArray<Node*> nodes(Compile::current()->unique()); 2071 nodes.push((Node*) this); 2072 while (nodes.length() > 0) { 2073 Node* current = nodes.pop(); 2074 if (NotANode(current)) { 2075 continue; 2076 } 2077 ns->append_if_missing(current); 2078 if (!current->is_CFG()) { 2079 for (DUIterator i = current->outs(); current->has_out(i); i++) { 2080 nodes.push(current->out(i)); 2081 } 2082 } 2083 } 2084 ns->remove((Node*) this); 2085 } 2086 2087 // VERIFICATION CODE 2088 // For each input edge to a node (ie - for each Use-Def edge), verify that 2089 // there is a corresponding Def-Use edge. 2090 //------------------------------verify_edges----------------------------------- 2091 void Node::verify_edges(Unique_Node_List &visited) { 2092 uint i, j, idx; 2093 int cnt; 2094 Node *n; 2095 2096 // Recursive termination test 2097 if (visited.member(this)) return; 2098 visited.push(this); 2099 2100 // Walk over all input edges, checking for correspondence 2101 for( i = 0; i < len(); i++ ) { 2102 n = in(i); 2103 if (n != NULL && !n->is_top()) { 2104 // Count instances of (Node *)this 2105 cnt = 0; 2106 for (idx = 0; idx < n->_outcnt; idx++ ) { 2107 if (n->_out[idx] == (Node *)this) cnt++; 2108 } 2109 assert( cnt > 0,"Failed to find Def-Use edge." ); 2110 // Check for duplicate edges 2111 // walk the input array downcounting the input edges to n 2112 for( j = 0; j < len(); j++ ) { 2113 if( in(j) == n ) cnt--; 2114 } 2115 assert( cnt == 0,"Mismatched edge count."); 2116 } else if (n == NULL) { 2117 assert(i >= req() || i == 0 || is_Region() || is_Phi(), "only regions or phis have null data edges"); 2118 } else { 2119 assert(n->is_top(), "sanity"); 2120 // Nothing to check. 2121 } 2122 } 2123 // Recursive walk over all input edges 2124 for( i = 0; i < len(); i++ ) { 2125 n = in(i); 2126 if( n != NULL ) 2127 in(i)->verify_edges(visited); 2128 } 2129 } 2130 2131 //------------------------------verify_recur----------------------------------- 2132 static const Node *unique_top = NULL; 2133 2134 void Node::verify_recur(const Node *n, int verify_depth, 2135 VectorSet &old_space, VectorSet &new_space) { 2136 if ( verify_depth == 0 ) return; 2137 if (verify_depth > 0) --verify_depth; 2138 2139 Compile* C = Compile::current(); 2140 2141 // Contained in new_space or old_space? 2142 VectorSet *v = C->node_arena()->contains(n) ? &new_space : &old_space; 2143 // Check for visited in the proper space. Numberings are not unique 2144 // across spaces so we need a separate VectorSet for each space. 2145 if( v->test_set(n->_idx) ) return; 2146 2147 if (n->is_Con() && n->bottom_type() == Type::TOP) { 2148 if (C->cached_top_node() == NULL) 2149 C->set_cached_top_node((Node*)n); 2150 assert(C->cached_top_node() == n, "TOP node must be unique"); 2151 } 2152 2153 for( uint i = 0; i < n->len(); i++ ) { 2154 Node *x = n->in(i); 2155 if (!x || x->is_top()) continue; 2156 2157 // Verify my input has a def-use edge to me 2158 if (true /*VerifyDefUse*/) { 2159 // Count use-def edges from n to x 2160 int cnt = 0; 2161 for( uint j = 0; j < n->len(); j++ ) 2162 if( n->in(j) == x ) 2163 cnt++; 2164 // Count def-use edges from x to n 2165 uint max = x->_outcnt; 2166 for( uint k = 0; k < max; k++ ) 2167 if (x->_out[k] == n) 2168 cnt--; 2169 assert( cnt == 0, "mismatched def-use edge counts" ); 2170 } 2171 2172 verify_recur(x, verify_depth, old_space, new_space); 2173 } 2174 2175 } 2176 2177 //------------------------------verify----------------------------------------- 2178 // Check Def-Use info for my subgraph 2179 void Node::verify() const { 2180 Compile* C = Compile::current(); 2181 Node* old_top = C->cached_top_node(); 2182 ResourceMark rm; 2183 ResourceArea *area = Thread::current()->resource_area(); 2184 VectorSet old_space(area), new_space(area); 2185 verify_recur(this, -1, old_space, new_space); 2186 C->set_cached_top_node(old_top); 2187 } 2188 #endif 2189 2190 2191 //------------------------------walk------------------------------------------- 2192 // Graph walk, with both pre-order and post-order functions 2193 void Node::walk(NFunc pre, NFunc post, void *env) { 2194 VectorSet visited(Thread::current()->resource_area()); // Setup for local walk 2195 walk_(pre, post, env, visited); 2196 } 2197 2198 void Node::walk_(NFunc pre, NFunc post, void *env, VectorSet &visited) { 2199 if( visited.test_set(_idx) ) return; 2200 pre(*this,env); // Call the pre-order walk function 2201 for( uint i=0; i<_max; i++ ) 2202 if( in(i) ) // Input exists and is not walked? 2203 in(i)->walk_(pre,post,env,visited); // Walk it with pre & post functions 2204 post(*this,env); // Call the post-order walk function 2205 } 2206 2207 void Node::nop(Node &, void*) {} 2208 2209 //------------------------------Registers-------------------------------------- 2210 // Do we Match on this edge index or not? Generally false for Control 2211 // and true for everything else. Weird for calls & returns. 2212 uint Node::match_edge(uint idx) const { 2213 return idx; // True for other than index 0 (control) 2214 } 2215 2216 static RegMask _not_used_at_all; 2217 // Register classes are defined for specific machines 2218 const RegMask &Node::out_RegMask() const { 2219 ShouldNotCallThis(); 2220 return _not_used_at_all; 2221 } 2222 2223 const RegMask &Node::in_RegMask(uint) const { 2224 ShouldNotCallThis(); 2225 return _not_used_at_all; 2226 } 2227 2228 //============================================================================= 2229 //----------------------------------------------------------------------------- 2230 void Node_Array::reset( Arena *new_arena ) { 2231 _a->Afree(_nodes,_max*sizeof(Node*)); 2232 _max = 0; 2233 _nodes = NULL; 2234 _a = new_arena; 2235 } 2236 2237 //------------------------------clear------------------------------------------ 2238 // Clear all entries in _nodes to NULL but keep storage 2239 void Node_Array::clear() { 2240 Copy::zero_to_bytes( _nodes, _max*sizeof(Node*) ); 2241 } 2242 2243 //----------------------------------------------------------------------------- 2244 void Node_Array::grow( uint i ) { 2245 if( !_max ) { 2246 _max = 1; 2247 _nodes = (Node**)_a->Amalloc( _max * sizeof(Node*) ); 2248 _nodes[0] = NULL; 2249 } 2250 uint old = _max; 2251 while( i >= _max ) _max <<= 1; // Double to fit 2252 _nodes = (Node**)_a->Arealloc( _nodes, old*sizeof(Node*),_max*sizeof(Node*)); 2253 Copy::zero_to_bytes( &_nodes[old], (_max-old)*sizeof(Node*) ); 2254 } 2255 2256 //----------------------------------------------------------------------------- 2257 void Node_Array::insert( uint i, Node *n ) { 2258 if( _nodes[_max-1] ) grow(_max); // Get more space if full 2259 Copy::conjoint_words_to_higher((HeapWord*)&_nodes[i], (HeapWord*)&_nodes[i+1], ((_max-i-1)*sizeof(Node*))); 2260 _nodes[i] = n; 2261 } 2262 2263 //----------------------------------------------------------------------------- 2264 void Node_Array::remove( uint i ) { 2265 Copy::conjoint_words_to_lower((HeapWord*)&_nodes[i+1], (HeapWord*)&_nodes[i], ((_max-i-1)*sizeof(Node*))); 2266 _nodes[_max-1] = NULL; 2267 } 2268 2269 //----------------------------------------------------------------------------- 2270 void Node_Array::sort( C_sort_func_t func) { 2271 qsort( _nodes, _max, sizeof( Node* ), func ); 2272 } 2273 2274 //----------------------------------------------------------------------------- 2275 void Node_Array::dump() const { 2276 #ifndef PRODUCT 2277 for( uint i = 0; i < _max; i++ ) { 2278 Node *nn = _nodes[i]; 2279 if( nn != NULL ) { 2280 tty->print("%5d--> ",i); nn->dump(); 2281 } 2282 } 2283 #endif 2284 } 2285 2286 //--------------------------is_iteratively_computed------------------------------ 2287 // Operation appears to be iteratively computed (such as an induction variable) 2288 // It is possible for this operation to return false for a loop-varying 2289 // value, if it appears (by local graph inspection) to be computed by a simple conditional. 2290 bool Node::is_iteratively_computed() { 2291 if (ideal_reg()) { // does operation have a result register? 2292 for (uint i = 1; i < req(); i++) { 2293 Node* n = in(i); 2294 if (n != NULL && n->is_Phi()) { 2295 for (uint j = 1; j < n->req(); j++) { 2296 if (n->in(j) == this) { 2297 return true; 2298 } 2299 } 2300 } 2301 } 2302 } 2303 return false; 2304 } 2305 2306 //--------------------------find_similar------------------------------ 2307 // Return a node with opcode "opc" and same inputs as "this" if one can 2308 // be found; Otherwise return NULL; 2309 Node* Node::find_similar(int opc) { 2310 if (req() >= 2) { 2311 Node* def = in(1); 2312 if (def && def->outcnt() >= 2) { 2313 for (DUIterator_Fast dmax, i = def->fast_outs(dmax); i < dmax; i++) { 2314 Node* use = def->fast_out(i); 2315 if (use != this && 2316 use->Opcode() == opc && 2317 use->req() == req()) { 2318 uint j; 2319 for (j = 0; j < use->req(); j++) { 2320 if (use->in(j) != in(j)) { 2321 break; 2322 } 2323 } 2324 if (j == use->req()) { 2325 return use; 2326 } 2327 } 2328 } 2329 } 2330 } 2331 return NULL; 2332 } 2333 2334 2335 //--------------------------unique_ctrl_out------------------------------ 2336 // Return the unique control out if only one. Null if none or more than one. 2337 Node* Node::unique_ctrl_out() const { 2338 Node* found = NULL; 2339 for (uint i = 0; i < outcnt(); i++) { 2340 Node* use = raw_out(i); 2341 if (use->is_CFG() && use != this) { 2342 if (found != NULL) return NULL; 2343 found = use; 2344 } 2345 } 2346 return found; 2347 } 2348 2349 void Node::ensure_control_or_add_prec(Node* c) { 2350 if (in(0) == NULL) { 2351 set_req(0, c); 2352 } else if (in(0) != c) { 2353 add_prec(c); 2354 } 2355 } 2356 2357 //============================================================================= 2358 //------------------------------yank------------------------------------------- 2359 // Find and remove 2360 void Node_List::yank( Node *n ) { 2361 uint i; 2362 for( i = 0; i < _cnt; i++ ) 2363 if( _nodes[i] == n ) 2364 break; 2365 2366 if( i < _cnt ) 2367 _nodes[i] = _nodes[--_cnt]; 2368 } 2369 2370 //------------------------------dump------------------------------------------- 2371 void Node_List::dump() const { 2372 #ifndef PRODUCT 2373 for( uint i = 0; i < _cnt; i++ ) 2374 if( _nodes[i] ) { 2375 tty->print("%5d--> ",i); 2376 _nodes[i]->dump(); 2377 } 2378 #endif 2379 } 2380 2381 void Node_List::dump_simple() const { 2382 #ifndef PRODUCT 2383 for( uint i = 0; i < _cnt; i++ ) 2384 if( _nodes[i] ) { 2385 tty->print(" %d", _nodes[i]->_idx); 2386 } else { 2387 tty->print(" NULL"); 2388 } 2389 #endif 2390 } 2391 2392 //============================================================================= 2393 //------------------------------remove----------------------------------------- 2394 void Unique_Node_List::remove( Node *n ) { 2395 if( _in_worklist[n->_idx] ) { 2396 for( uint i = 0; i < size(); i++ ) 2397 if( _nodes[i] == n ) { 2398 map(i,Node_List::pop()); 2399 _in_worklist >>= n->_idx; 2400 return; 2401 } 2402 ShouldNotReachHere(); 2403 } 2404 } 2405 2406 //-----------------------remove_useless_nodes---------------------------------- 2407 // Remove useless nodes from worklist 2408 void Unique_Node_List::remove_useless_nodes(VectorSet &useful) { 2409 2410 for( uint i = 0; i < size(); ++i ) { 2411 Node *n = at(i); 2412 assert( n != NULL, "Did not expect null entries in worklist"); 2413 if( ! useful.test(n->_idx) ) { 2414 _in_worklist >>= n->_idx; 2415 map(i,Node_List::pop()); 2416 // Node *replacement = Node_List::pop(); 2417 // if( i != size() ) { // Check if removing last entry 2418 // _nodes[i] = replacement; 2419 // } 2420 --i; // Visit popped node 2421 // If it was last entry, loop terminates since size() was also reduced 2422 } 2423 } 2424 } 2425 2426 //============================================================================= 2427 void Node_Stack::grow() { 2428 size_t old_top = pointer_delta(_inode_top,_inodes,sizeof(INode)); // save _top 2429 size_t old_max = pointer_delta(_inode_max,_inodes,sizeof(INode)); 2430 size_t max = old_max << 1; // max * 2 2431 _inodes = REALLOC_ARENA_ARRAY(_a, INode, _inodes, old_max, max); 2432 _inode_max = _inodes + max; 2433 _inode_top = _inodes + old_top; // restore _top 2434 } 2435 2436 // Node_Stack is used to map nodes. 2437 Node* Node_Stack::find(uint idx) const { 2438 uint sz = size(); 2439 for (uint i=0; i < sz; i++) { 2440 if (idx == index_at(i) ) 2441 return node_at(i); 2442 } 2443 return NULL; 2444 } 2445 2446 //============================================================================= 2447 uint TypeNode::size_of() const { return sizeof(*this); } 2448 #ifndef PRODUCT 2449 void TypeNode::dump_spec(outputStream *st) const { 2450 if( !Verbose && !WizardMode ) { 2451 // standard dump does this in Verbose and WizardMode 2452 st->print(" #"); _type->dump_on(st); 2453 } 2454 } 2455 2456 void TypeNode::dump_compact_spec(outputStream *st) const { 2457 st->print("#"); 2458 _type->dump_on(st); 2459 } 2460 #endif 2461 uint TypeNode::hash() const { 2462 return Node::hash() + _type->hash(); 2463 } 2464 bool TypeNode::cmp( const Node &n ) const 2465 { return !Type::cmp( _type, ((TypeNode&)n)._type ); } 2466 const Type *TypeNode::bottom_type() const { return _type; } 2467 const Type* TypeNode::Value(PhaseGVN* phase) const { return _type; } 2468 2469 //------------------------------ideal_reg-------------------------------------- 2470 uint TypeNode::ideal_reg() const { 2471 return _type->ideal_reg(); 2472 }