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