1 /* 2 * Copyright (c) 1997, 2018, 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 #ifndef SHARE_VM_OPTO_NODE_HPP 26 #define SHARE_VM_OPTO_NODE_HPP 27 28 #include "libadt/vectset.hpp" 29 #include "opto/compile.hpp" 30 #include "opto/type.hpp" 31 32 // Portions of code courtesy of Clifford Click 33 34 // Optimization - Graph Style 35 36 37 class AbstractLockNode; 38 class AddNode; 39 class AddPNode; 40 class AliasInfo; 41 class AllocateArrayNode; 42 class AllocateNode; 43 class ArrayCopyNode; 44 class Block; 45 class BoolNode; 46 class BoxLockNode; 47 class CMoveNode; 48 class CallDynamicJavaNode; 49 class CallJavaNode; 50 class CallLeafNode; 51 class CallNode; 52 class CallRuntimeNode; 53 class CallStaticJavaNode; 54 class CastIINode; 55 class CatchNode; 56 class CatchProjNode; 57 class CheckCastPPNode; 58 class ClearArrayNode; 59 class CmpNode; 60 class CodeBuffer; 61 class ConstraintCastNode; 62 class ConNode; 63 class CompareAndSwapNode; 64 class CompareAndExchangeNode; 65 class CountedLoopNode; 66 class CountedLoopEndNode; 67 class DecodeNarrowPtrNode; 68 class DecodeNNode; 69 class DecodeNKlassNode; 70 class EncodeNarrowPtrNode; 71 class EncodePNode; 72 class EncodePKlassNode; 73 class FastLockNode; 74 class FastUnlockNode; 75 class IfNode; 76 class IfProjNode; 77 class IfFalseNode; 78 class IfTrueNode; 79 class InitializeNode; 80 class JVMState; 81 class JumpNode; 82 class JumpProjNode; 83 class LoadNode; 84 class LoadBarrierNode; 85 class LoadBarrierSlowRegNode; 86 class LoadBarrierWeakSlowRegNode; 87 class LoadStoreNode; 88 class LockNode; 89 class LoopNode; 90 class MachBranchNode; 91 class MachCallDynamicJavaNode; 92 class MachCallJavaNode; 93 class MachCallLeafNode; 94 class MachCallNode; 95 class MachCallRuntimeNode; 96 class MachCallStaticJavaNode; 97 class MachConstantBaseNode; 98 class MachConstantNode; 99 class MachGotoNode; 100 class MachIfNode; 101 class MachJumpNode; 102 class MachNode; 103 class MachNullCheckNode; 104 class MachProjNode; 105 class MachReturnNode; 106 class MachSafePointNode; 107 class MachSpillCopyNode; 108 class MachTempNode; 109 class MachMergeNode; 110 class MachMemBarNode; 111 class Matcher; 112 class MemBarNode; 113 class MemBarStoreStoreNode; 114 class MemNode; 115 class MergeMemNode; 116 class MulNode; 117 class MultiNode; 118 class MultiBranchNode; 119 class NeverBranchNode; 120 class OuterStripMinedLoopNode; 121 class OuterStripMinedLoopEndNode; 122 class Node; 123 class Node_Array; 124 class Node_List; 125 class Node_Stack; 126 class NullCheckNode; 127 class OopMap; 128 class ParmNode; 129 class PCTableNode; 130 class PhaseCCP; 131 class PhaseGVN; 132 class PhaseIterGVN; 133 class PhaseRegAlloc; 134 class PhaseTransform; 135 class PhaseValues; 136 class PhiNode; 137 class Pipeline; 138 class ProjNode; 139 class RangeCheckNode; 140 class RegMask; 141 class RegionNode; 142 class RootNode; 143 class SafePointNode; 144 class SafePointScalarObjectNode; 145 class ShenandoahBarrierNode; 146 class ShenandoahWriteBarrierNode; 147 class ShenandoahReadBarrierNode; 148 class StartNode; 149 class State; 150 class StoreNode; 151 class SubNode; 152 class Type; 153 class TypeNode; 154 class UnlockNode; 155 class VectorNode; 156 class LoadVectorNode; 157 class StoreVectorNode; 158 class VectorSet; 159 typedef void (*NFunc)(Node&,void*); 160 extern "C" { 161 typedef int (*C_sort_func_t)(const void *, const void *); 162 } 163 164 // The type of all node counts and indexes. 165 // It must hold at least 16 bits, but must also be fast to load and store. 166 // This type, if less than 32 bits, could limit the number of possible nodes. 167 // (To make this type platform-specific, move to globalDefinitions_xxx.hpp.) 168 typedef unsigned int node_idx_t; 169 170 171 #ifndef OPTO_DU_ITERATOR_ASSERT 172 #ifdef ASSERT 173 #define OPTO_DU_ITERATOR_ASSERT 1 174 #else 175 #define OPTO_DU_ITERATOR_ASSERT 0 176 #endif 177 #endif //OPTO_DU_ITERATOR_ASSERT 178 179 #if OPTO_DU_ITERATOR_ASSERT 180 class DUIterator; 181 class DUIterator_Fast; 182 class DUIterator_Last; 183 #else 184 typedef uint DUIterator; 185 typedef Node** DUIterator_Fast; 186 typedef Node** DUIterator_Last; 187 #endif 188 189 // Node Sentinel 190 #define NodeSentinel (Node*)-1 191 192 // Unknown count frequency 193 #define COUNT_UNKNOWN (-1.0f) 194 195 //------------------------------Node------------------------------------------- 196 // Nodes define actions in the program. They create values, which have types. 197 // They are both vertices in a directed graph and program primitives. Nodes 198 // are labeled; the label is the "opcode", the primitive function in the lambda 199 // calculus sense that gives meaning to the Node. Node inputs are ordered (so 200 // that "a-b" is different from "b-a"). The inputs to a Node are the inputs to 201 // the Node's function. These inputs also define a Type equation for the Node. 202 // Solving these Type equations amounts to doing dataflow analysis. 203 // Control and data are uniformly represented in the graph. Finally, Nodes 204 // have a unique dense integer index which is used to index into side arrays 205 // whenever I have phase-specific information. 206 207 class Node { 208 friend class VMStructs; 209 210 // Lots of restrictions on cloning Nodes 211 Node(const Node&); // not defined; linker error to use these 212 Node &operator=(const Node &rhs); 213 214 public: 215 friend class Compile; 216 #if OPTO_DU_ITERATOR_ASSERT 217 friend class DUIterator_Common; 218 friend class DUIterator; 219 friend class DUIterator_Fast; 220 friend class DUIterator_Last; 221 #endif 222 223 // Because Nodes come and go, I define an Arena of Node structures to pull 224 // from. This should allow fast access to node creation & deletion. This 225 // field is a local cache of a value defined in some "program fragment" for 226 // which these Nodes are just a part of. 227 228 inline void* operator new(size_t x) throw() { 229 Compile* C = Compile::current(); 230 Node* n = (Node*)C->node_arena()->Amalloc_D(x); 231 return (void*)n; 232 } 233 234 // Delete is a NOP 235 void operator delete( void *ptr ) {} 236 // Fancy destructor; eagerly attempt to reclaim Node numberings and storage 237 void destruct(); 238 239 // Create a new Node. Required is the number is of inputs required for 240 // semantic correctness. 241 Node( uint required ); 242 243 // Create a new Node with given input edges. 244 // This version requires use of the "edge-count" new. 245 // E.g. new (C,3) FooNode( C, NULL, left, right ); 246 Node( Node *n0 ); 247 Node( Node *n0, Node *n1 ); 248 Node( Node *n0, Node *n1, Node *n2 ); 249 Node( Node *n0, Node *n1, Node *n2, Node *n3 ); 250 Node( Node *n0, Node *n1, Node *n2, Node *n3, Node *n4 ); 251 Node( Node *n0, Node *n1, Node *n2, Node *n3, Node *n4, Node *n5 ); 252 Node( Node *n0, Node *n1, Node *n2, Node *n3, 253 Node *n4, Node *n5, Node *n6 ); 254 255 // Clone an inherited Node given only the base Node type. 256 Node* clone() const; 257 258 // Clone a Node, immediately supplying one or two new edges. 259 // The first and second arguments, if non-null, replace in(1) and in(2), 260 // respectively. 261 Node* clone_with_data_edge(Node* in1, Node* in2 = NULL) const { 262 Node* nn = clone(); 263 if (in1 != NULL) nn->set_req(1, in1); 264 if (in2 != NULL) nn->set_req(2, in2); 265 return nn; 266 } 267 268 private: 269 // Shared setup for the above constructors. 270 // Handles all interactions with Compile::current. 271 // Puts initial values in all Node fields except _idx. 272 // Returns the initial value for _idx, which cannot 273 // be initialized by assignment. 274 inline int Init(int req); 275 276 //----------------- input edge handling 277 protected: 278 friend class PhaseCFG; // Access to address of _in array elements 279 Node **_in; // Array of use-def references to Nodes 280 Node **_out; // Array of def-use references to Nodes 281 282 // Input edges are split into two categories. Required edges are required 283 // for semantic correctness; order is important and NULLs are allowed. 284 // Precedence edges are used to help determine execution order and are 285 // added, e.g., for scheduling purposes. They are unordered and not 286 // duplicated; they have no embedded NULLs. Edges from 0 to _cnt-1 287 // are required, from _cnt to _max-1 are precedence edges. 288 node_idx_t _cnt; // Total number of required Node inputs. 289 290 node_idx_t _max; // Actual length of input array. 291 292 // Output edges are an unordered list of def-use edges which exactly 293 // correspond to required input edges which point from other nodes 294 // to this one. Thus the count of the output edges is the number of 295 // users of this node. 296 node_idx_t _outcnt; // Total number of Node outputs. 297 298 node_idx_t _outmax; // Actual length of output array. 299 300 // Grow the actual input array to the next larger power-of-2 bigger than len. 301 void grow( uint len ); 302 // Grow the output array to the next larger power-of-2 bigger than len. 303 void out_grow( uint len ); 304 305 public: 306 // Each Node is assigned a unique small/dense number. This number is used 307 // to index into auxiliary arrays of data and bit vectors. 308 // The field _idx is declared constant to defend against inadvertent assignments, 309 // since it is used by clients as a naked field. However, the field's value can be 310 // changed using the set_idx() method. 311 // 312 // The PhaseRenumberLive phase renumbers nodes based on liveness information. 313 // Therefore, it updates the value of the _idx field. The parse-time _idx is 314 // preserved in _parse_idx. 315 const node_idx_t _idx; 316 DEBUG_ONLY(const node_idx_t _parse_idx;) 317 318 // Get the (read-only) number of input edges 319 uint req() const { return _cnt; } 320 uint len() const { return _max; } 321 // Get the (read-only) number of output edges 322 uint outcnt() const { return _outcnt; } 323 324 #if OPTO_DU_ITERATOR_ASSERT 325 // Iterate over the out-edges of this node. Deletions are illegal. 326 inline DUIterator outs() const; 327 // Use this when the out array might have changed to suppress asserts. 328 inline DUIterator& refresh_out_pos(DUIterator& i) const; 329 // Does the node have an out at this position? (Used for iteration.) 330 inline bool has_out(DUIterator& i) const; 331 inline Node* out(DUIterator& i) const; 332 // Iterate over the out-edges of this node. All changes are illegal. 333 inline DUIterator_Fast fast_outs(DUIterator_Fast& max) const; 334 inline Node* fast_out(DUIterator_Fast& i) const; 335 // Iterate over the out-edges of this node, deleting one at a time. 336 inline DUIterator_Last last_outs(DUIterator_Last& min) const; 337 inline Node* last_out(DUIterator_Last& i) const; 338 // The inline bodies of all these methods are after the iterator definitions. 339 #else 340 // Iterate over the out-edges of this node. Deletions are illegal. 341 // This iteration uses integral indexes, to decouple from array reallocations. 342 DUIterator outs() const { return 0; } 343 // Use this when the out array might have changed to suppress asserts. 344 DUIterator refresh_out_pos(DUIterator i) const { return i; } 345 346 // Reference to the i'th output Node. Error if out of bounds. 347 Node* out(DUIterator i) const { assert(i < _outcnt, "oob"); return _out[i]; } 348 // Does the node have an out at this position? (Used for iteration.) 349 bool has_out(DUIterator i) const { return i < _outcnt; } 350 351 // Iterate over the out-edges of this node. All changes are illegal. 352 // This iteration uses a pointer internal to the out array. 353 DUIterator_Fast fast_outs(DUIterator_Fast& max) const { 354 Node** out = _out; 355 // Assign a limit pointer to the reference argument: 356 max = out + (ptrdiff_t)_outcnt; 357 // Return the base pointer: 358 return out; 359 } 360 Node* fast_out(DUIterator_Fast i) const { return *i; } 361 // Iterate over the out-edges of this node, deleting one at a time. 362 // This iteration uses a pointer internal to the out array. 363 DUIterator_Last last_outs(DUIterator_Last& min) const { 364 Node** out = _out; 365 // Assign a limit pointer to the reference argument: 366 min = out; 367 // Return the pointer to the start of the iteration: 368 return out + (ptrdiff_t)_outcnt - 1; 369 } 370 Node* last_out(DUIterator_Last i) const { return *i; } 371 #endif 372 373 // Reference to the i'th input Node. Error if out of bounds. 374 Node* in(uint i) const { assert(i < _max, "oob: i=%d, _max=%d", i, _max); return _in[i]; } 375 // Reference to the i'th input Node. NULL if out of bounds. 376 Node* lookup(uint i) const { return ((i < _max) ? _in[i] : NULL); } 377 // Reference to the i'th output Node. Error if out of bounds. 378 // Use this accessor sparingly. We are going trying to use iterators instead. 379 Node* raw_out(uint i) const { assert(i < _outcnt,"oob"); return _out[i]; } 380 // Return the unique out edge. 381 Node* unique_out() const { assert(_outcnt==1,"not unique"); return _out[0]; } 382 // Delete out edge at position 'i' by moving last out edge to position 'i' 383 void raw_del_out(uint i) { 384 assert(i < _outcnt,"oob"); 385 assert(_outcnt > 0,"oob"); 386 #if OPTO_DU_ITERATOR_ASSERT 387 // Record that a change happened here. 388 debug_only(_last_del = _out[i]; ++_del_tick); 389 #endif 390 _out[i] = _out[--_outcnt]; 391 // Smash the old edge so it can't be used accidentally. 392 debug_only(_out[_outcnt] = (Node *)(uintptr_t)0xdeadbeef); 393 } 394 395 #ifdef ASSERT 396 bool is_dead() const; 397 #define is_not_dead(n) ((n) == NULL || !VerifyIterativeGVN || !((n)->is_dead())) 398 #endif 399 // Check whether node has become unreachable 400 bool is_unreachable(PhaseIterGVN &igvn) const; 401 402 // Set a required input edge, also updates corresponding output edge 403 void add_req( Node *n ); // Append a NEW required input 404 void add_req( Node *n0, Node *n1 ) { 405 add_req(n0); add_req(n1); } 406 void add_req( Node *n0, Node *n1, Node *n2 ) { 407 add_req(n0); add_req(n1); add_req(n2); } 408 void add_req_batch( Node* n, uint m ); // Append m NEW required inputs (all n). 409 void del_req( uint idx ); // Delete required edge & compact 410 void del_req_ordered( uint idx ); // Delete required edge & compact with preserved order 411 void ins_req( uint i, Node *n ); // Insert a NEW required input 412 void set_req( uint i, Node *n ) { 413 assert( is_not_dead(n), "can not use dead node"); 414 assert( i < _cnt, "oob: i=%d, _cnt=%d", i, _cnt); 415 assert( !VerifyHashTableKeys || _hash_lock == 0, 416 "remove node from hash table before modifying it"); 417 Node** p = &_in[i]; // cache this._in, across the del_out call 418 if (*p != NULL) (*p)->del_out((Node *)this); 419 (*p) = n; 420 if (n != NULL) n->add_out((Node *)this); 421 Compile::current()->record_modified_node(this); 422 } 423 // Light version of set_req() to init inputs after node creation. 424 void init_req( uint i, Node *n ) { 425 assert( i == 0 && this == n || 426 is_not_dead(n), "can not use dead node"); 427 assert( i < _cnt, "oob"); 428 assert( !VerifyHashTableKeys || _hash_lock == 0, 429 "remove node from hash table before modifying it"); 430 assert( _in[i] == NULL, "sanity"); 431 _in[i] = n; 432 if (n != NULL) n->add_out((Node *)this); 433 Compile::current()->record_modified_node(this); 434 } 435 // Find first occurrence of n among my edges: 436 int find_edge(Node* n); 437 int find_prec_edge(Node* n) { 438 for (uint i = req(); i < len(); i++) { 439 if (_in[i] == n) return i; 440 if (_in[i] == NULL) { 441 DEBUG_ONLY( while ((++i) < len()) assert(_in[i] == NULL, "Gap in prec edges!"); ) 442 break; 443 } 444 } 445 return -1; 446 } 447 int replace_edge(Node* old, Node* neww); 448 int replace_edges_in_range(Node* old, Node* neww, int start, int end); 449 // NULL out all inputs to eliminate incoming Def-Use edges. 450 // Return the number of edges between 'n' and 'this' 451 int disconnect_inputs(Node *n, Compile *c); 452 453 // Quickly, return true if and only if I am Compile::current()->top(). 454 bool is_top() const { 455 assert((this == (Node*) Compile::current()->top()) == (_out == NULL), ""); 456 return (_out == NULL); 457 } 458 // Reaffirm invariants for is_top. (Only from Compile::set_cached_top_node.) 459 void setup_is_top(); 460 461 // Strip away casting. (It is depth-limited.) 462 Node* uncast() const; 463 // Return whether two Nodes are equivalent, after stripping casting. 464 bool eqv_uncast(const Node* n) const { 465 return (this->uncast() == n->uncast()); 466 } 467 468 // Find out of current node that matches opcode. 469 Node* find_out_with(int opcode); 470 // Return true if the current node has an out that matches opcode. 471 bool has_out_with(int opcode); 472 // Return true if the current node has an out that matches any of the opcodes. 473 bool has_out_with(int opcode1, int opcode2, int opcode3, int opcode4); 474 475 private: 476 static Node* uncast_helper(const Node* n); 477 478 // Add an output edge to the end of the list 479 void add_out( Node *n ) { 480 if (is_top()) return; 481 if( _outcnt == _outmax ) out_grow(_outcnt); 482 _out[_outcnt++] = n; 483 } 484 // Delete an output edge 485 void del_out( Node *n ) { 486 if (is_top()) return; 487 Node** outp = &_out[_outcnt]; 488 // Find and remove n 489 do { 490 assert(outp > _out, "Missing Def-Use edge"); 491 } while (*--outp != n); 492 *outp = _out[--_outcnt]; 493 // Smash the old edge so it can't be used accidentally. 494 debug_only(_out[_outcnt] = (Node *)(uintptr_t)0xdeadbeef); 495 // Record that a change happened here. 496 #if OPTO_DU_ITERATOR_ASSERT 497 debug_only(_last_del = n; ++_del_tick); 498 #endif 499 } 500 // Close gap after removing edge. 501 void close_prec_gap_at(uint gap) { 502 assert(_cnt <= gap && gap < _max, "no valid prec edge"); 503 uint i = gap; 504 Node *last = NULL; 505 for (; i < _max-1; ++i) { 506 Node *next = _in[i+1]; 507 if (next == NULL) break; 508 last = next; 509 } 510 _in[gap] = last; // Move last slot to empty one. 511 _in[i] = NULL; // NULL out last slot. 512 } 513 514 public: 515 // Globally replace this node by a given new node, updating all uses. 516 void replace_by(Node* new_node); 517 // Globally replace this node by a given new node, updating all uses 518 // and cutting input edges of old node. 519 void subsume_by(Node* new_node, Compile* c) { 520 replace_by(new_node); 521 disconnect_inputs(NULL, c); 522 } 523 void set_req_X( uint i, Node *n, PhaseIterGVN *igvn ); 524 // Find the one non-null required input. RegionNode only 525 Node *nonnull_req() const; 526 // Add or remove precedence edges 527 void add_prec( Node *n ); 528 void rm_prec( uint i ); 529 530 // Note: prec(i) will not necessarily point to n if edge already exists. 531 void set_prec( uint i, Node *n ) { 532 assert(i < _max, "oob: i=%d, _max=%d", i, _max); 533 assert(is_not_dead(n), "can not use dead node"); 534 assert(i >= _cnt, "not a precedence edge"); 535 // Avoid spec violation: duplicated prec edge. 536 if (_in[i] == n) return; 537 if (n == NULL || find_prec_edge(n) != -1) { 538 rm_prec(i); 539 return; 540 } 541 if (_in[i] != NULL) _in[i]->del_out((Node *)this); 542 _in[i] = n; 543 if (n != NULL) n->add_out((Node *)this); 544 } 545 546 // Set this node's index, used by cisc_version to replace current node 547 void set_idx(uint new_idx) { 548 const node_idx_t* ref = &_idx; 549 *(node_idx_t*)ref = new_idx; 550 } 551 // Swap input edge order. (Edge indexes i1 and i2 are usually 1 and 2.) 552 void swap_edges(uint i1, uint i2) { 553 debug_only(uint check_hash = (VerifyHashTableKeys && _hash_lock) ? hash() : NO_HASH); 554 // Def-Use info is unchanged 555 Node* n1 = in(i1); 556 Node* n2 = in(i2); 557 _in[i1] = n2; 558 _in[i2] = n1; 559 // If this node is in the hash table, make sure it doesn't need a rehash. 560 assert(check_hash == NO_HASH || check_hash == hash(), "edge swap must preserve hash code"); 561 } 562 563 // Iterators over input Nodes for a Node X are written as: 564 // for( i = 0; i < X.req(); i++ ) ... X[i] ... 565 // NOTE: Required edges can contain embedded NULL pointers. 566 567 //----------------- Other Node Properties 568 569 // Generate class IDs for (some) ideal nodes so that it is possible to determine 570 // the type of a node using a non-virtual method call (the method is_<Node>() below). 571 // 572 // A class ID of an ideal node is a set of bits. In a class ID, a single bit determines 573 // the type of the node the ID represents; another subset of an ID's bits are reserved 574 // for the superclasses of the node represented by the ID. 575 // 576 // By design, if A is a supertype of B, A.is_B() returns true and B.is_A() 577 // returns false. A.is_A() returns true. 578 // 579 // If two classes, A and B, have the same superclass, a different bit of A's class id 580 // is reserved for A's type than for B's type. That bit is specified by the third 581 // parameter in the macro DEFINE_CLASS_ID. 582 // 583 // By convention, classes with deeper hierarchy are declared first. Moreover, 584 // classes with the same hierarchy depth are sorted by usage frequency. 585 // 586 // The query method masks the bits to cut off bits of subclasses and then compares 587 // the result with the class id (see the macro DEFINE_CLASS_QUERY below). 588 // 589 // Class_MachCall=30, ClassMask_MachCall=31 590 // 12 8 4 0 591 // 0 0 0 0 0 0 0 0 1 1 1 1 0 592 // | | | | 593 // | | | Bit_Mach=2 594 // | | Bit_MachReturn=4 595 // | Bit_MachSafePoint=8 596 // Bit_MachCall=16 597 // 598 // Class_CountedLoop=56, ClassMask_CountedLoop=63 599 // 12 8 4 0 600 // 0 0 0 0 0 0 0 1 1 1 0 0 0 601 // | | | 602 // | | Bit_Region=8 603 // | Bit_Loop=16 604 // Bit_CountedLoop=32 605 606 #define DEFINE_CLASS_ID(cl, supcl, subn) \ 607 Bit_##cl = (Class_##supcl == 0) ? 1 << subn : (Bit_##supcl) << (1 + subn) , \ 608 Class_##cl = Class_##supcl + Bit_##cl , \ 609 ClassMask_##cl = ((Bit_##cl << 1) - 1) , 610 611 // This enum is used only for C2 ideal and mach nodes with is_<node>() methods 612 // so that it's values fits into 16 bits. 613 enum NodeClasses { 614 Bit_Node = 0x0000, 615 Class_Node = 0x0000, 616 ClassMask_Node = 0xFFFF, 617 618 DEFINE_CLASS_ID(Multi, Node, 0) 619 DEFINE_CLASS_ID(SafePoint, Multi, 0) 620 DEFINE_CLASS_ID(Call, SafePoint, 0) 621 DEFINE_CLASS_ID(CallJava, Call, 0) 622 DEFINE_CLASS_ID(CallStaticJava, CallJava, 0) 623 DEFINE_CLASS_ID(CallDynamicJava, CallJava, 1) 624 DEFINE_CLASS_ID(CallRuntime, Call, 1) 625 DEFINE_CLASS_ID(CallLeaf, CallRuntime, 0) 626 DEFINE_CLASS_ID(Allocate, Call, 2) 627 DEFINE_CLASS_ID(AllocateArray, Allocate, 0) 628 DEFINE_CLASS_ID(AbstractLock, Call, 3) 629 DEFINE_CLASS_ID(Lock, AbstractLock, 0) 630 DEFINE_CLASS_ID(Unlock, AbstractLock, 1) 631 DEFINE_CLASS_ID(ArrayCopy, Call, 4) 632 DEFINE_CLASS_ID(MultiBranch, Multi, 1) 633 DEFINE_CLASS_ID(PCTable, MultiBranch, 0) 634 DEFINE_CLASS_ID(Catch, PCTable, 0) 635 DEFINE_CLASS_ID(Jump, PCTable, 1) 636 DEFINE_CLASS_ID(If, MultiBranch, 1) 637 DEFINE_CLASS_ID(CountedLoopEnd, If, 0) 638 DEFINE_CLASS_ID(RangeCheck, If, 1) 639 DEFINE_CLASS_ID(OuterStripMinedLoopEnd, If, 2) 640 DEFINE_CLASS_ID(NeverBranch, MultiBranch, 2) 641 DEFINE_CLASS_ID(Start, Multi, 2) 642 DEFINE_CLASS_ID(MemBar, Multi, 3) 643 DEFINE_CLASS_ID(Initialize, MemBar, 0) 644 DEFINE_CLASS_ID(MemBarStoreStore, MemBar, 1) 645 DEFINE_CLASS_ID(LoadBarrier, Multi, 4) 646 647 DEFINE_CLASS_ID(Mach, Node, 1) 648 DEFINE_CLASS_ID(MachReturn, Mach, 0) 649 DEFINE_CLASS_ID(MachSafePoint, MachReturn, 0) 650 DEFINE_CLASS_ID(MachCall, MachSafePoint, 0) 651 DEFINE_CLASS_ID(MachCallJava, MachCall, 0) 652 DEFINE_CLASS_ID(MachCallStaticJava, MachCallJava, 0) 653 DEFINE_CLASS_ID(MachCallDynamicJava, MachCallJava, 1) 654 DEFINE_CLASS_ID(MachCallRuntime, MachCall, 1) 655 DEFINE_CLASS_ID(MachCallLeaf, MachCallRuntime, 0) 656 DEFINE_CLASS_ID(MachBranch, Mach, 1) 657 DEFINE_CLASS_ID(MachIf, MachBranch, 0) 658 DEFINE_CLASS_ID(MachGoto, MachBranch, 1) 659 DEFINE_CLASS_ID(MachNullCheck, MachBranch, 2) 660 DEFINE_CLASS_ID(MachSpillCopy, Mach, 2) 661 DEFINE_CLASS_ID(MachTemp, Mach, 3) 662 DEFINE_CLASS_ID(MachConstantBase, Mach, 4) 663 DEFINE_CLASS_ID(MachConstant, Mach, 5) 664 DEFINE_CLASS_ID(MachJump, MachConstant, 0) 665 DEFINE_CLASS_ID(MachMerge, Mach, 6) 666 DEFINE_CLASS_ID(MachMemBar, Mach, 7) 667 668 DEFINE_CLASS_ID(Type, Node, 2) 669 DEFINE_CLASS_ID(Phi, Type, 0) 670 DEFINE_CLASS_ID(ConstraintCast, Type, 1) 671 DEFINE_CLASS_ID(CastII, ConstraintCast, 0) 672 DEFINE_CLASS_ID(CheckCastPP, ConstraintCast, 1) 673 DEFINE_CLASS_ID(CMove, Type, 3) 674 DEFINE_CLASS_ID(SafePointScalarObject, Type, 4) 675 DEFINE_CLASS_ID(DecodeNarrowPtr, Type, 5) 676 DEFINE_CLASS_ID(DecodeN, DecodeNarrowPtr, 0) 677 DEFINE_CLASS_ID(DecodeNKlass, DecodeNarrowPtr, 1) 678 DEFINE_CLASS_ID(EncodeNarrowPtr, Type, 6) 679 DEFINE_CLASS_ID(EncodeP, EncodeNarrowPtr, 0) 680 DEFINE_CLASS_ID(EncodePKlass, EncodeNarrowPtr, 1) 681 DEFINE_CLASS_ID(ShenandoahBarrier, Type, 7) 682 683 DEFINE_CLASS_ID(Proj, Node, 3) 684 DEFINE_CLASS_ID(CatchProj, Proj, 0) 685 DEFINE_CLASS_ID(JumpProj, Proj, 1) 686 DEFINE_CLASS_ID(IfProj, Proj, 2) 687 DEFINE_CLASS_ID(IfTrue, IfProj, 0) 688 DEFINE_CLASS_ID(IfFalse, IfProj, 1) 689 DEFINE_CLASS_ID(Parm, Proj, 4) 690 DEFINE_CLASS_ID(MachProj, Proj, 5) 691 692 DEFINE_CLASS_ID(Mem, Node, 4) 693 DEFINE_CLASS_ID(Load, Mem, 0) 694 DEFINE_CLASS_ID(LoadVector, Load, 0) 695 DEFINE_CLASS_ID(LoadBarrierSlowReg, Load, 1) 696 DEFINE_CLASS_ID(LoadBarrierWeakSlowReg, Load, 2) 697 DEFINE_CLASS_ID(Store, Mem, 1) 698 DEFINE_CLASS_ID(StoreVector, Store, 0) 699 DEFINE_CLASS_ID(LoadStore, Mem, 2) 700 DEFINE_CLASS_ID(LoadStoreConditional, LoadStore, 0) 701 DEFINE_CLASS_ID(CompareAndSwap, LoadStoreConditional, 0) 702 DEFINE_CLASS_ID(CompareAndExchangeNode, LoadStore, 1) 703 704 DEFINE_CLASS_ID(Region, Node, 5) 705 DEFINE_CLASS_ID(Loop, Region, 0) 706 DEFINE_CLASS_ID(Root, Loop, 0) 707 DEFINE_CLASS_ID(CountedLoop, Loop, 1) 708 DEFINE_CLASS_ID(OuterStripMinedLoop, Loop, 2) 709 710 DEFINE_CLASS_ID(Sub, Node, 6) 711 DEFINE_CLASS_ID(Cmp, Sub, 0) 712 DEFINE_CLASS_ID(FastLock, Cmp, 0) 713 DEFINE_CLASS_ID(FastUnlock, Cmp, 1) 714 715 DEFINE_CLASS_ID(MergeMem, Node, 7) 716 DEFINE_CLASS_ID(Bool, Node, 8) 717 DEFINE_CLASS_ID(AddP, Node, 9) 718 DEFINE_CLASS_ID(BoxLock, Node, 10) 719 DEFINE_CLASS_ID(Add, Node, 11) 720 DEFINE_CLASS_ID(Mul, Node, 12) 721 DEFINE_CLASS_ID(Vector, Node, 13) 722 DEFINE_CLASS_ID(ClearArray, Node, 14) 723 724 _max_classes = ClassMask_ClearArray 725 }; 726 #undef DEFINE_CLASS_ID 727 728 // Flags are sorted by usage frequency. 729 enum NodeFlags { 730 Flag_is_Copy = 0x01, // should be first bit to avoid shift 731 Flag_rematerialize = Flag_is_Copy << 1, 732 Flag_needs_anti_dependence_check = Flag_rematerialize << 1, 733 Flag_is_macro = Flag_needs_anti_dependence_check << 1, 734 Flag_is_Con = Flag_is_macro << 1, 735 Flag_is_cisc_alternate = Flag_is_Con << 1, 736 Flag_is_dead_loop_safe = Flag_is_cisc_alternate << 1, 737 Flag_may_be_short_branch = Flag_is_dead_loop_safe << 1, 738 Flag_avoid_back_to_back_before = Flag_may_be_short_branch << 1, 739 Flag_avoid_back_to_back_after = Flag_avoid_back_to_back_before << 1, 740 Flag_has_call = Flag_avoid_back_to_back_after << 1, 741 Flag_is_reduction = Flag_has_call << 1, 742 Flag_is_scheduled = Flag_is_reduction << 1, 743 Flag_has_vector_mask_set = Flag_is_scheduled << 1, 744 Flag_is_expensive = Flag_has_vector_mask_set << 1, 745 _max_flags = (Flag_is_expensive << 1) - 1 // allow flags combination 746 }; 747 748 private: 749 jushort _class_id; 750 jushort _flags; 751 752 protected: 753 // These methods should be called from constructors only. 754 void init_class_id(jushort c) { 755 assert(c <= _max_classes, "invalid node class"); 756 _class_id = c; // cast out const 757 } 758 void init_flags(jushort fl) { 759 assert(fl <= _max_flags, "invalid node flag"); 760 _flags |= fl; 761 } 762 void clear_flag(jushort fl) { 763 assert(fl <= _max_flags, "invalid node flag"); 764 _flags &= ~fl; 765 } 766 767 public: 768 const jushort class_id() const { return _class_id; } 769 770 const jushort flags() const { return _flags; } 771 772 void add_flag(jushort fl) { init_flags(fl); } 773 774 void remove_flag(jushort fl) { clear_flag(fl); } 775 776 // Return a dense integer opcode number 777 virtual int Opcode() const; 778 779 // Virtual inherited Node size 780 virtual uint size_of() const; 781 782 // Other interesting Node properties 783 #define DEFINE_CLASS_QUERY(type) \ 784 bool is_##type() const { \ 785 return ((_class_id & ClassMask_##type) == Class_##type); \ 786 } \ 787 type##Node *as_##type() const { \ 788 assert(is_##type(), "invalid node class"); \ 789 return (type##Node*)this; \ 790 } \ 791 type##Node* isa_##type() const { \ 792 return (is_##type()) ? as_##type() : NULL; \ 793 } 794 795 DEFINE_CLASS_QUERY(AbstractLock) 796 DEFINE_CLASS_QUERY(Add) 797 DEFINE_CLASS_QUERY(AddP) 798 DEFINE_CLASS_QUERY(Allocate) 799 DEFINE_CLASS_QUERY(AllocateArray) 800 DEFINE_CLASS_QUERY(ArrayCopy) 801 DEFINE_CLASS_QUERY(Bool) 802 DEFINE_CLASS_QUERY(BoxLock) 803 DEFINE_CLASS_QUERY(Call) 804 DEFINE_CLASS_QUERY(CallDynamicJava) 805 DEFINE_CLASS_QUERY(CallJava) 806 DEFINE_CLASS_QUERY(CallLeaf) 807 DEFINE_CLASS_QUERY(CallRuntime) 808 DEFINE_CLASS_QUERY(CallStaticJava) 809 DEFINE_CLASS_QUERY(Catch) 810 DEFINE_CLASS_QUERY(CatchProj) 811 DEFINE_CLASS_QUERY(CheckCastPP) 812 DEFINE_CLASS_QUERY(CastII) 813 DEFINE_CLASS_QUERY(ConstraintCast) 814 DEFINE_CLASS_QUERY(ClearArray) 815 DEFINE_CLASS_QUERY(CMove) 816 DEFINE_CLASS_QUERY(Cmp) 817 DEFINE_CLASS_QUERY(CountedLoop) 818 DEFINE_CLASS_QUERY(CountedLoopEnd) 819 DEFINE_CLASS_QUERY(DecodeNarrowPtr) 820 DEFINE_CLASS_QUERY(DecodeN) 821 DEFINE_CLASS_QUERY(DecodeNKlass) 822 DEFINE_CLASS_QUERY(EncodeNarrowPtr) 823 DEFINE_CLASS_QUERY(EncodeP) 824 DEFINE_CLASS_QUERY(EncodePKlass) 825 DEFINE_CLASS_QUERY(FastLock) 826 DEFINE_CLASS_QUERY(FastUnlock) 827 DEFINE_CLASS_QUERY(If) 828 DEFINE_CLASS_QUERY(RangeCheck) 829 DEFINE_CLASS_QUERY(IfProj) 830 DEFINE_CLASS_QUERY(IfFalse) 831 DEFINE_CLASS_QUERY(IfTrue) 832 DEFINE_CLASS_QUERY(Initialize) 833 DEFINE_CLASS_QUERY(Jump) 834 DEFINE_CLASS_QUERY(JumpProj) 835 DEFINE_CLASS_QUERY(Load) 836 DEFINE_CLASS_QUERY(LoadStore) 837 DEFINE_CLASS_QUERY(LoadBarrier) 838 DEFINE_CLASS_QUERY(LoadBarrierSlowReg) 839 DEFINE_CLASS_QUERY(LoadBarrierWeakSlowReg) 840 DEFINE_CLASS_QUERY(Lock) 841 DEFINE_CLASS_QUERY(Loop) 842 DEFINE_CLASS_QUERY(Mach) 843 DEFINE_CLASS_QUERY(MachBranch) 844 DEFINE_CLASS_QUERY(MachCall) 845 DEFINE_CLASS_QUERY(MachCallDynamicJava) 846 DEFINE_CLASS_QUERY(MachCallJava) 847 DEFINE_CLASS_QUERY(MachCallLeaf) 848 DEFINE_CLASS_QUERY(MachCallRuntime) 849 DEFINE_CLASS_QUERY(MachCallStaticJava) 850 DEFINE_CLASS_QUERY(MachConstantBase) 851 DEFINE_CLASS_QUERY(MachConstant) 852 DEFINE_CLASS_QUERY(MachGoto) 853 DEFINE_CLASS_QUERY(MachIf) 854 DEFINE_CLASS_QUERY(MachJump) 855 DEFINE_CLASS_QUERY(MachNullCheck) 856 DEFINE_CLASS_QUERY(MachProj) 857 DEFINE_CLASS_QUERY(MachReturn) 858 DEFINE_CLASS_QUERY(MachSafePoint) 859 DEFINE_CLASS_QUERY(MachSpillCopy) 860 DEFINE_CLASS_QUERY(MachTemp) 861 DEFINE_CLASS_QUERY(MachMemBar) 862 DEFINE_CLASS_QUERY(MachMerge) 863 DEFINE_CLASS_QUERY(Mem) 864 DEFINE_CLASS_QUERY(MemBar) 865 DEFINE_CLASS_QUERY(MemBarStoreStore) 866 DEFINE_CLASS_QUERY(MergeMem) 867 DEFINE_CLASS_QUERY(Mul) 868 DEFINE_CLASS_QUERY(Multi) 869 DEFINE_CLASS_QUERY(MultiBranch) 870 DEFINE_CLASS_QUERY(OuterStripMinedLoop) 871 DEFINE_CLASS_QUERY(OuterStripMinedLoopEnd) 872 DEFINE_CLASS_QUERY(Parm) 873 DEFINE_CLASS_QUERY(PCTable) 874 DEFINE_CLASS_QUERY(Phi) 875 DEFINE_CLASS_QUERY(Proj) 876 DEFINE_CLASS_QUERY(Region) 877 DEFINE_CLASS_QUERY(Root) 878 DEFINE_CLASS_QUERY(SafePoint) 879 DEFINE_CLASS_QUERY(SafePointScalarObject) 880 DEFINE_CLASS_QUERY(ShenandoahBarrier) 881 DEFINE_CLASS_QUERY(Start) 882 DEFINE_CLASS_QUERY(Store) 883 DEFINE_CLASS_QUERY(Sub) 884 DEFINE_CLASS_QUERY(Type) 885 DEFINE_CLASS_QUERY(Vector) 886 DEFINE_CLASS_QUERY(LoadVector) 887 DEFINE_CLASS_QUERY(StoreVector) 888 DEFINE_CLASS_QUERY(Unlock) 889 890 #undef DEFINE_CLASS_QUERY 891 892 // duplicate of is_MachSpillCopy() 893 bool is_SpillCopy () const { 894 return ((_class_id & ClassMask_MachSpillCopy) == Class_MachSpillCopy); 895 } 896 897 bool is_Con () const { return (_flags & Flag_is_Con) != 0; } 898 // The data node which is safe to leave in dead loop during IGVN optimization. 899 bool is_dead_loop_safe() const { 900 return is_Phi() || (is_Proj() && in(0) == NULL) || 901 ((_flags & (Flag_is_dead_loop_safe | Flag_is_Con)) != 0 && 902 (!is_Proj() || !in(0)->is_Allocate())); 903 } 904 905 // is_Copy() returns copied edge index (0 or 1) 906 uint is_Copy() const { return (_flags & Flag_is_Copy); } 907 908 virtual bool is_CFG() const { return false; } 909 910 // If this node is control-dependent on a test, can it be 911 // rerouted to a dominating equivalent test? This is usually 912 // true of non-CFG nodes, but can be false for operations which 913 // depend for their correct sequencing on more than one test. 914 // (In that case, hoisting to a dominating test may silently 915 // skip some other important test.) 916 virtual bool depends_only_on_test() const { assert(!is_CFG(), ""); return true; }; 917 918 // When building basic blocks, I need to have a notion of block beginning 919 // Nodes, next block selector Nodes (block enders), and next block 920 // projections. These calls need to work on their machine equivalents. The 921 // Ideal beginning Nodes are RootNode, RegionNode and StartNode. 922 bool is_block_start() const { 923 if ( is_Region() ) 924 return this == (const Node*)in(0); 925 else 926 return is_Start(); 927 } 928 929 // The Ideal control projection Nodes are IfTrue/IfFalse, JumpProjNode, Root, 930 // Goto and Return. This call also returns the block ending Node. 931 virtual const Node *is_block_proj() const; 932 933 // The node is a "macro" node which needs to be expanded before matching 934 bool is_macro() const { return (_flags & Flag_is_macro) != 0; } 935 // The node is expensive: the best control is set during loop opts 936 bool is_expensive() const { return (_flags & Flag_is_expensive) != 0 && in(0) != NULL; } 937 938 // An arithmetic node which accumulates a data in a loop. 939 // It must have the loop's phi as input and provide a def to the phi. 940 bool is_reduction() const { return (_flags & Flag_is_reduction) != 0; } 941 942 // The node is a CountedLoopEnd with a mask annotation so as to emit a restore context 943 bool has_vector_mask_set() const { return (_flags & Flag_has_vector_mask_set) != 0; } 944 945 // Used in lcm to mark nodes that have scheduled 946 bool is_scheduled() const { return (_flags & Flag_is_scheduled) != 0; } 947 948 //----------------- Optimization 949 950 // Get the worst-case Type output for this Node. 951 virtual const class Type *bottom_type() const; 952 953 // If we find a better type for a node, try to record it permanently. 954 // Return true if this node actually changed. 955 // Be sure to do the hash_delete game in the "rehash" variant. 956 void raise_bottom_type(const Type* new_type); 957 958 // Get the address type with which this node uses and/or defs memory, 959 // or NULL if none. The address type is conservatively wide. 960 // Returns non-null for calls, membars, loads, stores, etc. 961 // Returns TypePtr::BOTTOM if the node touches memory "broadly". 962 virtual const class TypePtr *adr_type() const { return NULL; } 963 964 // Return an existing node which computes the same function as this node. 965 // The optimistic combined algorithm requires this to return a Node which 966 // is a small number of steps away (e.g., one of my inputs). 967 virtual Node* Identity(PhaseGVN* phase); 968 969 // Return the set of values this Node can take on at runtime. 970 virtual const Type* Value(PhaseGVN* phase) const; 971 972 // Return a node which is more "ideal" than the current node. 973 // The invariants on this call are subtle. If in doubt, read the 974 // treatise in node.cpp above the default implemention AND TEST WITH 975 // +VerifyIterativeGVN! 976 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 977 978 // Some nodes have specific Ideal subgraph transformations only if they are 979 // unique users of specific nodes. Such nodes should be put on IGVN worklist 980 // for the transformations to happen. 981 bool has_special_unique_user() const; 982 983 // Skip Proj and CatchProj nodes chains. Check for Null and Top. 984 Node* find_exact_control(Node* ctrl); 985 986 // Check if 'this' node dominates or equal to 'sub'. 987 bool dominates(Node* sub, Node_List &nlist); 988 989 virtual bool is_g1_marking_load() const { return false; } 990 virtual bool is_g1_marking_if(PhaseTransform *phase) const { return false; } 991 virtual bool is_shenandoah_wb_pre_call() const { return false; } 992 virtual bool is_shenandoah_state_load() const { return false; } 993 virtual bool is_shenandoah_marking_if(PhaseTransform *phase) const { return false; } 994 995 protected: 996 bool remove_dead_region(PhaseGVN *phase, bool can_reshape); 997 public: 998 999 // See if there is valid pipeline info 1000 static const Pipeline *pipeline_class(); 1001 virtual const Pipeline *pipeline() const; 1002 1003 // Compute the latency from the def to this instruction of the ith input node 1004 uint latency(uint i); 1005 1006 // Hash & compare functions, for pessimistic value numbering 1007 1008 // If the hash function returns the special sentinel value NO_HASH, 1009 // the node is guaranteed never to compare equal to any other node. 1010 // If we accidentally generate a hash with value NO_HASH the node 1011 // won't go into the table and we'll lose a little optimization. 1012 enum { NO_HASH = 0 }; 1013 virtual uint hash() const; 1014 virtual uint cmp( const Node &n ) const; 1015 1016 // Operation appears to be iteratively computed (such as an induction variable) 1017 // It is possible for this operation to return false for a loop-varying 1018 // value, if it appears (by local graph inspection) to be computed by a simple conditional. 1019 bool is_iteratively_computed(); 1020 1021 // Determine if a node is Counted loop induction variable. 1022 // The method is defined in loopnode.cpp. 1023 const Node* is_loop_iv() const; 1024 1025 // Return a node with opcode "opc" and same inputs as "this" if one can 1026 // be found; Otherwise return NULL; 1027 Node* find_similar(int opc); 1028 1029 // Return the unique control out if only one. Null if none or more than one. 1030 Node* unique_ctrl_out() const; 1031 1032 // Set control or add control as precedence edge 1033 void ensure_control_or_add_prec(Node* c); 1034 1035 //----------------- Code Generation 1036 1037 // Ideal register class for Matching. Zero means unmatched instruction 1038 // (these are cloned instead of converted to machine nodes). 1039 virtual uint ideal_reg() const; 1040 1041 static const uint NotAMachineReg; // must be > max. machine register 1042 1043 // Do we Match on this edge index or not? Generally false for Control 1044 // and true for everything else. Weird for calls & returns. 1045 virtual uint match_edge(uint idx) const; 1046 1047 // Register class output is returned in 1048 virtual const RegMask &out_RegMask() const; 1049 // Register class input is expected in 1050 virtual const RegMask &in_RegMask(uint) const; 1051 // Should we clone rather than spill this instruction? 1052 bool rematerialize() const; 1053 1054 // Return JVM State Object if this Node carries debug info, or NULL otherwise 1055 virtual JVMState* jvms() const; 1056 1057 // Print as assembly 1058 virtual void format( PhaseRegAlloc *, outputStream* st = tty ) const; 1059 // Emit bytes starting at parameter 'ptr' 1060 // Bump 'ptr' by the number of output bytes 1061 virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const; 1062 // Size of instruction in bytes 1063 virtual uint size(PhaseRegAlloc *ra_) const; 1064 1065 // Convenience function to extract an integer constant from a node. 1066 // If it is not an integer constant (either Con, CastII, or Mach), 1067 // return value_if_unknown. 1068 jint find_int_con(jint value_if_unknown) const { 1069 const TypeInt* t = find_int_type(); 1070 return (t != NULL && t->is_con()) ? t->get_con() : value_if_unknown; 1071 } 1072 // Return the constant, knowing it is an integer constant already 1073 jint get_int() const { 1074 const TypeInt* t = find_int_type(); 1075 guarantee(t != NULL, "must be con"); 1076 return t->get_con(); 1077 } 1078 // Here's where the work is done. Can produce non-constant int types too. 1079 const TypeInt* find_int_type() const; 1080 1081 // Same thing for long (and intptr_t, via type.hpp): 1082 jlong get_long() const { 1083 const TypeLong* t = find_long_type(); 1084 guarantee(t != NULL, "must be con"); 1085 return t->get_con(); 1086 } 1087 jlong find_long_con(jint value_if_unknown) const { 1088 const TypeLong* t = find_long_type(); 1089 return (t != NULL && t->is_con()) ? t->get_con() : value_if_unknown; 1090 } 1091 const TypeLong* find_long_type() const; 1092 1093 const TypePtr* get_ptr_type() const; 1094 1095 // These guys are called by code generated by ADLC: 1096 intptr_t get_ptr() const; 1097 intptr_t get_narrowcon() const; 1098 jdouble getd() const; 1099 jfloat getf() const; 1100 1101 // Nodes which are pinned into basic blocks 1102 virtual bool pinned() const { return false; } 1103 1104 // Nodes which use memory without consuming it, hence need antidependences 1105 // More specifically, needs_anti_dependence_check returns true iff the node 1106 // (a) does a load, and (b) does not perform a store (except perhaps to a 1107 // stack slot or some other unaliased location). 1108 bool needs_anti_dependence_check() const; 1109 1110 // Return which operand this instruction may cisc-spill. In other words, 1111 // return operand position that can convert from reg to memory access 1112 virtual int cisc_operand() const { return AdlcVMDeps::Not_cisc_spillable; } 1113 bool is_cisc_alternate() const { return (_flags & Flag_is_cisc_alternate) != 0; } 1114 1115 //----------------- Graph walking 1116 public: 1117 // Walk and apply member functions recursively. 1118 // Supplied (this) pointer is root. 1119 void walk(NFunc pre, NFunc post, void *env); 1120 static void nop(Node &, void*); // Dummy empty function 1121 static void packregion( Node &n, void* ); 1122 private: 1123 void walk_(NFunc pre, NFunc post, void *env, VectorSet &visited); 1124 1125 //----------------- Printing, etc 1126 public: 1127 #ifndef PRODUCT 1128 Node* find(int idx) const; // Search the graph for the given idx. 1129 Node* find_ctrl(int idx) const; // Search control ancestors for the given idx. 1130 void dump() const { dump("\n"); } // Print this node. 1131 void dump(const char* suffix, bool mark = false, outputStream *st = tty) const; // Print this node. 1132 void dump(int depth) const; // Print this node, recursively to depth d 1133 void dump_ctrl(int depth) const; // Print control nodes, to depth d 1134 void dump_comp() const; // Print this node in compact representation. 1135 // Print this node in compact representation. 1136 void dump_comp(const char* suffix, outputStream *st = tty) const; 1137 virtual void dump_req(outputStream *st = tty) const; // Print required-edge info 1138 virtual void dump_prec(outputStream *st = tty) const; // Print precedence-edge info 1139 virtual void dump_out(outputStream *st = tty) const; // Print the output edge info 1140 virtual void dump_spec(outputStream *st) const {}; // Print per-node info 1141 // Print compact per-node info 1142 virtual void dump_compact_spec(outputStream *st) const { dump_spec(st); } 1143 void dump_related() const; // Print related nodes (depends on node at hand). 1144 // Print related nodes up to given depths for input and output nodes. 1145 void dump_related(uint d_in, uint d_out) const; 1146 void dump_related_compact() const; // Print related nodes in compact representation. 1147 // Collect related nodes. 1148 virtual void related(GrowableArray<Node*> *in_rel, GrowableArray<Node*> *out_rel, bool compact) const; 1149 // Collect nodes starting from this node, explicitly including/excluding control and data links. 1150 void collect_nodes(GrowableArray<Node*> *ns, int d, bool ctrl, bool data) const; 1151 1152 // Node collectors, to be used in implementations of Node::rel(). 1153 // Collect the entire data input graph. Include control inputs if requested. 1154 void collect_nodes_in_all_data(GrowableArray<Node*> *ns, bool ctrl) const; 1155 // Collect the entire control input graph. Include data inputs if requested. 1156 void collect_nodes_in_all_ctrl(GrowableArray<Node*> *ns, bool data) const; 1157 // Collect the entire output graph until hitting and including control nodes. 1158 void collect_nodes_out_all_ctrl_boundary(GrowableArray<Node*> *ns) const; 1159 1160 void verify_edges(Unique_Node_List &visited); // Verify bi-directional edges 1161 void verify() const; // Check Def-Use info for my subgraph 1162 static void verify_recur(const Node *n, int verify_depth, VectorSet &old_space, VectorSet &new_space); 1163 1164 // This call defines a class-unique string used to identify class instances 1165 virtual const char *Name() const; 1166 1167 void dump_format(PhaseRegAlloc *ra) const; // debug access to MachNode::format(...) 1168 // RegMask Print Functions 1169 void dump_in_regmask(int idx) { in_RegMask(idx).dump(); } 1170 void dump_out_regmask() { out_RegMask().dump(); } 1171 static bool in_dump() { return Compile::current()->_in_dump_cnt > 0; } 1172 void fast_dump() const { 1173 tty->print("%4d: %-17s", _idx, Name()); 1174 for (uint i = 0; i < len(); i++) 1175 if (in(i)) 1176 tty->print(" %4d", in(i)->_idx); 1177 else 1178 tty->print(" NULL"); 1179 tty->print("\n"); 1180 } 1181 #endif 1182 #ifdef ASSERT 1183 void verify_construction(); 1184 bool verify_jvms(const JVMState* jvms) const; 1185 int _debug_idx; // Unique value assigned to every node. 1186 int debug_idx() const { return _debug_idx; } 1187 void set_debug_idx( int debug_idx ) { _debug_idx = debug_idx; } 1188 1189 Node* _debug_orig; // Original version of this, if any. 1190 Node* debug_orig() const { return _debug_orig; } 1191 void set_debug_orig(Node* orig); // _debug_orig = orig 1192 1193 int _hash_lock; // Barrier to modifications of nodes in the hash table 1194 void enter_hash_lock() { ++_hash_lock; assert(_hash_lock < 99, "in too many hash tables?"); } 1195 void exit_hash_lock() { --_hash_lock; assert(_hash_lock >= 0, "mispaired hash locks"); } 1196 1197 static void init_NodeProperty(); 1198 1199 #if OPTO_DU_ITERATOR_ASSERT 1200 const Node* _last_del; // The last deleted node. 1201 uint _del_tick; // Bumped when a deletion happens.. 1202 #endif 1203 #endif 1204 }; 1205 1206 1207 #ifndef PRODUCT 1208 1209 // Used in debugging code to avoid walking across dead or uninitialized edges. 1210 inline bool NotANode(const Node* n) { 1211 if (n == NULL) return true; 1212 if (((intptr_t)n & 1) != 0) return true; // uninitialized, etc. 1213 if (*(address*)n == badAddress) return true; // kill by Node::destruct 1214 return false; 1215 } 1216 1217 #endif 1218 1219 1220 //----------------------------------------------------------------------------- 1221 // Iterators over DU info, and associated Node functions. 1222 1223 #if OPTO_DU_ITERATOR_ASSERT 1224 1225 // Common code for assertion checking on DU iterators. 1226 class DUIterator_Common { 1227 #ifdef ASSERT 1228 protected: 1229 bool _vdui; // cached value of VerifyDUIterators 1230 const Node* _node; // the node containing the _out array 1231 uint _outcnt; // cached node->_outcnt 1232 uint _del_tick; // cached node->_del_tick 1233 Node* _last; // last value produced by the iterator 1234 1235 void sample(const Node* node); // used by c'tor to set up for verifies 1236 void verify(const Node* node, bool at_end_ok = false); 1237 void verify_resync(); 1238 void reset(const DUIterator_Common& that); 1239 1240 // The VDUI_ONLY macro protects code conditionalized on VerifyDUIterators 1241 #define I_VDUI_ONLY(i,x) { if ((i)._vdui) { x; } } 1242 #else 1243 #define I_VDUI_ONLY(i,x) { } 1244 #endif //ASSERT 1245 }; 1246 1247 #define VDUI_ONLY(x) I_VDUI_ONLY(*this, x) 1248 1249 // Default DU iterator. Allows appends onto the out array. 1250 // Allows deletion from the out array only at the current point. 1251 // Usage: 1252 // for (DUIterator i = x->outs(); x->has_out(i); i++) { 1253 // Node* y = x->out(i); 1254 // ... 1255 // } 1256 // Compiles in product mode to a unsigned integer index, which indexes 1257 // onto a repeatedly reloaded base pointer of x->_out. The loop predicate 1258 // also reloads x->_outcnt. If you delete, you must perform "--i" just 1259 // before continuing the loop. You must delete only the last-produced 1260 // edge. You must delete only a single copy of the last-produced edge, 1261 // or else you must delete all copies at once (the first time the edge 1262 // is produced by the iterator). 1263 class DUIterator : public DUIterator_Common { 1264 friend class Node; 1265 1266 // This is the index which provides the product-mode behavior. 1267 // Whatever the product-mode version of the system does to the 1268 // DUI index is done to this index. All other fields in 1269 // this class are used only for assertion checking. 1270 uint _idx; 1271 1272 #ifdef ASSERT 1273 uint _refresh_tick; // Records the refresh activity. 1274 1275 void sample(const Node* node); // Initialize _refresh_tick etc. 1276 void verify(const Node* node, bool at_end_ok = false); 1277 void verify_increment(); // Verify an increment operation. 1278 void verify_resync(); // Verify that we can back up over a deletion. 1279 void verify_finish(); // Verify that the loop terminated properly. 1280 void refresh(); // Resample verification info. 1281 void reset(const DUIterator& that); // Resample after assignment. 1282 #endif 1283 1284 DUIterator(const Node* node, int dummy_to_avoid_conversion) 1285 { _idx = 0; debug_only(sample(node)); } 1286 1287 public: 1288 // initialize to garbage; clear _vdui to disable asserts 1289 DUIterator() 1290 { /*initialize to garbage*/ debug_only(_vdui = false); } 1291 1292 void operator++(int dummy_to_specify_postfix_op) 1293 { _idx++; VDUI_ONLY(verify_increment()); } 1294 1295 void operator--() 1296 { VDUI_ONLY(verify_resync()); --_idx; } 1297 1298 ~DUIterator() 1299 { VDUI_ONLY(verify_finish()); } 1300 1301 void operator=(const DUIterator& that) 1302 { _idx = that._idx; debug_only(reset(that)); } 1303 }; 1304 1305 DUIterator Node::outs() const 1306 { return DUIterator(this, 0); } 1307 DUIterator& Node::refresh_out_pos(DUIterator& i) const 1308 { I_VDUI_ONLY(i, i.refresh()); return i; } 1309 bool Node::has_out(DUIterator& i) const 1310 { I_VDUI_ONLY(i, i.verify(this,true));return i._idx < _outcnt; } 1311 Node* Node::out(DUIterator& i) const 1312 { I_VDUI_ONLY(i, i.verify(this)); return debug_only(i._last=) _out[i._idx]; } 1313 1314 1315 // Faster DU iterator. Disallows insertions into the out array. 1316 // Allows deletion from the out array only at the current point. 1317 // Usage: 1318 // for (DUIterator_Fast imax, i = x->fast_outs(imax); i < imax; i++) { 1319 // Node* y = x->fast_out(i); 1320 // ... 1321 // } 1322 // Compiles in product mode to raw Node** pointer arithmetic, with 1323 // no reloading of pointers from the original node x. If you delete, 1324 // you must perform "--i; --imax" just before continuing the loop. 1325 // If you delete multiple copies of the same edge, you must decrement 1326 // imax, but not i, multiple times: "--i, imax -= num_edges". 1327 class DUIterator_Fast : public DUIterator_Common { 1328 friend class Node; 1329 friend class DUIterator_Last; 1330 1331 // This is the pointer which provides the product-mode behavior. 1332 // Whatever the product-mode version of the system does to the 1333 // DUI pointer is done to this pointer. All other fields in 1334 // this class are used only for assertion checking. 1335 Node** _outp; 1336 1337 #ifdef ASSERT 1338 void verify(const Node* node, bool at_end_ok = false); 1339 void verify_limit(); 1340 void verify_resync(); 1341 void verify_relimit(uint n); 1342 void reset(const DUIterator_Fast& that); 1343 #endif 1344 1345 // Note: offset must be signed, since -1 is sometimes passed 1346 DUIterator_Fast(const Node* node, ptrdiff_t offset) 1347 { _outp = node->_out + offset; debug_only(sample(node)); } 1348 1349 public: 1350 // initialize to garbage; clear _vdui to disable asserts 1351 DUIterator_Fast() 1352 { /*initialize to garbage*/ debug_only(_vdui = false); } 1353 1354 void operator++(int dummy_to_specify_postfix_op) 1355 { _outp++; VDUI_ONLY(verify(_node, true)); } 1356 1357 void operator--() 1358 { VDUI_ONLY(verify_resync()); --_outp; } 1359 1360 void operator-=(uint n) // applied to the limit only 1361 { _outp -= n; VDUI_ONLY(verify_relimit(n)); } 1362 1363 bool operator<(DUIterator_Fast& limit) { 1364 I_VDUI_ONLY(*this, this->verify(_node, true)); 1365 I_VDUI_ONLY(limit, limit.verify_limit()); 1366 return _outp < limit._outp; 1367 } 1368 1369 void operator=(const DUIterator_Fast& that) 1370 { _outp = that._outp; debug_only(reset(that)); } 1371 }; 1372 1373 DUIterator_Fast Node::fast_outs(DUIterator_Fast& imax) const { 1374 // Assign a limit pointer to the reference argument: 1375 imax = DUIterator_Fast(this, (ptrdiff_t)_outcnt); 1376 // Return the base pointer: 1377 return DUIterator_Fast(this, 0); 1378 } 1379 Node* Node::fast_out(DUIterator_Fast& i) const { 1380 I_VDUI_ONLY(i, i.verify(this)); 1381 return debug_only(i._last=) *i._outp; 1382 } 1383 1384 1385 // Faster DU iterator. Requires each successive edge to be removed. 1386 // Does not allow insertion of any edges. 1387 // Usage: 1388 // for (DUIterator_Last imin, i = x->last_outs(imin); i >= imin; i -= num_edges) { 1389 // Node* y = x->last_out(i); 1390 // ... 1391 // } 1392 // Compiles in product mode to raw Node** pointer arithmetic, with 1393 // no reloading of pointers from the original node x. 1394 class DUIterator_Last : private DUIterator_Fast { 1395 friend class Node; 1396 1397 #ifdef ASSERT 1398 void verify(const Node* node, bool at_end_ok = false); 1399 void verify_limit(); 1400 void verify_step(uint num_edges); 1401 #endif 1402 1403 // Note: offset must be signed, since -1 is sometimes passed 1404 DUIterator_Last(const Node* node, ptrdiff_t offset) 1405 : DUIterator_Fast(node, offset) { } 1406 1407 void operator++(int dummy_to_specify_postfix_op) {} // do not use 1408 void operator<(int) {} // do not use 1409 1410 public: 1411 DUIterator_Last() { } 1412 // initialize to garbage 1413 1414 void operator--() 1415 { _outp--; VDUI_ONLY(verify_step(1)); } 1416 1417 void operator-=(uint n) 1418 { _outp -= n; VDUI_ONLY(verify_step(n)); } 1419 1420 bool operator>=(DUIterator_Last& limit) { 1421 I_VDUI_ONLY(*this, this->verify(_node, true)); 1422 I_VDUI_ONLY(limit, limit.verify_limit()); 1423 return _outp >= limit._outp; 1424 } 1425 1426 void operator=(const DUIterator_Last& that) 1427 { DUIterator_Fast::operator=(that); } 1428 }; 1429 1430 DUIterator_Last Node::last_outs(DUIterator_Last& imin) const { 1431 // Assign a limit pointer to the reference argument: 1432 imin = DUIterator_Last(this, 0); 1433 // Return the initial pointer: 1434 return DUIterator_Last(this, (ptrdiff_t)_outcnt - 1); 1435 } 1436 Node* Node::last_out(DUIterator_Last& i) const { 1437 I_VDUI_ONLY(i, i.verify(this)); 1438 return debug_only(i._last=) *i._outp; 1439 } 1440 1441 #endif //OPTO_DU_ITERATOR_ASSERT 1442 1443 #undef I_VDUI_ONLY 1444 #undef VDUI_ONLY 1445 1446 // An Iterator that truly follows the iterator pattern. Doesn't 1447 // support deletion but could be made to. 1448 // 1449 // for (SimpleDUIterator i(n); i.has_next(); i.next()) { 1450 // Node* m = i.get(); 1451 // 1452 class SimpleDUIterator : public StackObj { 1453 private: 1454 Node* node; 1455 DUIterator_Fast i; 1456 DUIterator_Fast imax; 1457 public: 1458 SimpleDUIterator(Node* n): node(n), i(n->fast_outs(imax)) {} 1459 bool has_next() { return i < imax; } 1460 void next() { i++; } 1461 Node* get() { return node->fast_out(i); } 1462 }; 1463 1464 1465 //----------------------------------------------------------------------------- 1466 // Map dense integer indices to Nodes. Uses classic doubling-array trick. 1467 // Abstractly provides an infinite array of Node*'s, initialized to NULL. 1468 // Note that the constructor just zeros things, and since I use Arena 1469 // allocation I do not need a destructor to reclaim storage. 1470 class Node_Array : public ResourceObj { 1471 friend class VMStructs; 1472 protected: 1473 Arena *_a; // Arena to allocate in 1474 uint _max; 1475 Node **_nodes; 1476 void grow( uint i ); // Grow array node to fit 1477 public: 1478 Node_Array(Arena *a) : _a(a), _max(OptoNodeListSize) { 1479 _nodes = NEW_ARENA_ARRAY( a, Node *, OptoNodeListSize ); 1480 for( int i = 0; i < OptoNodeListSize; i++ ) { 1481 _nodes[i] = NULL; 1482 } 1483 } 1484 1485 Node_Array(Node_Array *na) : _a(na->_a), _max(na->_max), _nodes(na->_nodes) {} 1486 Node *operator[] ( uint i ) const // Lookup, or NULL for not mapped 1487 { return (i<_max) ? _nodes[i] : (Node*)NULL; } 1488 Node *at( uint i ) const { assert(i<_max,"oob"); return _nodes[i]; } 1489 Node **adr() { return _nodes; } 1490 // Extend the mapping: index i maps to Node *n. 1491 void map( uint i, Node *n ) { if( i>=_max ) grow(i); _nodes[i] = n; } 1492 void insert( uint i, Node *n ); 1493 void remove( uint i ); // Remove, preserving order 1494 void sort( C_sort_func_t func); 1495 void reset( Arena *new_a ); // Zap mapping to empty; reclaim storage 1496 void clear(); // Set all entries to NULL, keep storage 1497 uint Size() const { return _max; } 1498 void dump() const; 1499 }; 1500 1501 class Node_List : public Node_Array { 1502 friend class VMStructs; 1503 uint _cnt; 1504 public: 1505 Node_List() : Node_Array(Thread::current()->resource_area()), _cnt(0) {} 1506 Node_List(Arena *a) : Node_Array(a), _cnt(0) {} 1507 bool contains(const Node* n) const { 1508 for (uint e = 0; e < size(); e++) { 1509 if (at(e) == n) return true; 1510 } 1511 return false; 1512 } 1513 void insert( uint i, Node *n ) { Node_Array::insert(i,n); _cnt++; } 1514 void remove( uint i ) { Node_Array::remove(i); _cnt--; } 1515 void push( Node *b ) { map(_cnt++,b); } 1516 void yank( Node *n ); // Find and remove 1517 Node *pop() { return _nodes[--_cnt]; } 1518 Node *rpop() { Node *b = _nodes[0]; _nodes[0]=_nodes[--_cnt]; return b;} 1519 void clear() { _cnt = 0; Node_Array::clear(); } // retain storage 1520 uint size() const { return _cnt; } 1521 void dump() const; 1522 void dump_simple() const; 1523 }; 1524 1525 //------------------------------Unique_Node_List------------------------------- 1526 class Unique_Node_List : public Node_List { 1527 friend class VMStructs; 1528 VectorSet _in_worklist; 1529 uint _clock_index; // Index in list where to pop from next 1530 public: 1531 Unique_Node_List() : Node_List(), _in_worklist(Thread::current()->resource_area()), _clock_index(0) {} 1532 Unique_Node_List(Arena *a) : Node_List(a), _in_worklist(a), _clock_index(0) {} 1533 1534 void remove( Node *n ); 1535 bool member( Node *n ) { return _in_worklist.test(n->_idx) != 0; } 1536 VectorSet &member_set(){ return _in_worklist; } 1537 1538 void push( Node *b ) { 1539 if( !_in_worklist.test_set(b->_idx) ) 1540 Node_List::push(b); 1541 } 1542 Node *pop() { 1543 if( _clock_index >= size() ) _clock_index = 0; 1544 Node *b = at(_clock_index); 1545 map( _clock_index, Node_List::pop()); 1546 if (size() != 0) _clock_index++; // Always start from 0 1547 _in_worklist >>= b->_idx; 1548 return b; 1549 } 1550 Node *remove( uint i ) { 1551 Node *b = Node_List::at(i); 1552 _in_worklist >>= b->_idx; 1553 map(i,Node_List::pop()); 1554 return b; 1555 } 1556 void yank( Node *n ) { _in_worklist >>= n->_idx; Node_List::yank(n); } 1557 void clear() { 1558 _in_worklist.Clear(); // Discards storage but grows automatically 1559 Node_List::clear(); 1560 _clock_index = 0; 1561 } 1562 1563 // Used after parsing to remove useless nodes before Iterative GVN 1564 void remove_useless_nodes(VectorSet &useful); 1565 1566 #ifndef PRODUCT 1567 void print_set() const { _in_worklist.print(); } 1568 #endif 1569 }; 1570 1571 // Inline definition of Compile::record_for_igvn must be deferred to this point. 1572 inline void Compile::record_for_igvn(Node* n) { 1573 _for_igvn->push(n); 1574 } 1575 1576 //------------------------------Node_Stack------------------------------------- 1577 class Node_Stack { 1578 friend class VMStructs; 1579 protected: 1580 struct INode { 1581 Node *node; // Processed node 1582 uint indx; // Index of next node's child 1583 }; 1584 INode *_inode_top; // tos, stack grows up 1585 INode *_inode_max; // End of _inodes == _inodes + _max 1586 INode *_inodes; // Array storage for the stack 1587 Arena *_a; // Arena to allocate in 1588 void grow(); 1589 public: 1590 Node_Stack(int size) { 1591 size_t max = (size > OptoNodeListSize) ? size : OptoNodeListSize; 1592 _a = Thread::current()->resource_area(); 1593 _inodes = NEW_ARENA_ARRAY( _a, INode, max ); 1594 _inode_max = _inodes + max; 1595 _inode_top = _inodes - 1; // stack is empty 1596 } 1597 1598 Node_Stack(Arena *a, int size) : _a(a) { 1599 size_t max = (size > OptoNodeListSize) ? size : OptoNodeListSize; 1600 _inodes = NEW_ARENA_ARRAY( _a, INode, max ); 1601 _inode_max = _inodes + max; 1602 _inode_top = _inodes - 1; // stack is empty 1603 } 1604 1605 void pop() { 1606 assert(_inode_top >= _inodes, "node stack underflow"); 1607 --_inode_top; 1608 } 1609 void push(Node *n, uint i) { 1610 ++_inode_top; 1611 if (_inode_top >= _inode_max) grow(); 1612 INode *top = _inode_top; // optimization 1613 top->node = n; 1614 top->indx = i; 1615 } 1616 Node *node() const { 1617 return _inode_top->node; 1618 } 1619 Node* node_at(uint i) const { 1620 assert(_inodes + i <= _inode_top, "in range"); 1621 return _inodes[i].node; 1622 } 1623 uint index() const { 1624 return _inode_top->indx; 1625 } 1626 uint index_at(uint i) const { 1627 assert(_inodes + i <= _inode_top, "in range"); 1628 return _inodes[i].indx; 1629 } 1630 void set_node(Node *n) { 1631 _inode_top->node = n; 1632 } 1633 void set_index(uint i) { 1634 _inode_top->indx = i; 1635 } 1636 uint size_max() const { return (uint)pointer_delta(_inode_max, _inodes, sizeof(INode)); } // Max size 1637 uint size() const { return (uint)pointer_delta((_inode_top+1), _inodes, sizeof(INode)); } // Current size 1638 bool is_nonempty() const { return (_inode_top >= _inodes); } 1639 bool is_empty() const { return (_inode_top < _inodes); } 1640 void clear() { _inode_top = _inodes - 1; } // retain storage 1641 1642 // Node_Stack is used to map nodes. 1643 Node* find(uint idx) const; 1644 }; 1645 1646 1647 //-----------------------------Node_Notes-------------------------------------- 1648 // Debugging or profiling annotations loosely and sparsely associated 1649 // with some nodes. See Compile::node_notes_at for the accessor. 1650 class Node_Notes { 1651 friend class VMStructs; 1652 JVMState* _jvms; 1653 1654 public: 1655 Node_Notes(JVMState* jvms = NULL) { 1656 _jvms = jvms; 1657 } 1658 1659 JVMState* jvms() { return _jvms; } 1660 void set_jvms(JVMState* x) { _jvms = x; } 1661 1662 // True if there is nothing here. 1663 bool is_clear() { 1664 return (_jvms == NULL); 1665 } 1666 1667 // Make there be nothing here. 1668 void clear() { 1669 _jvms = NULL; 1670 } 1671 1672 // Make a new, clean node notes. 1673 static Node_Notes* make(Compile* C) { 1674 Node_Notes* nn = NEW_ARENA_ARRAY(C->comp_arena(), Node_Notes, 1); 1675 nn->clear(); 1676 return nn; 1677 } 1678 1679 Node_Notes* clone(Compile* C) { 1680 Node_Notes* nn = NEW_ARENA_ARRAY(C->comp_arena(), Node_Notes, 1); 1681 (*nn) = (*this); 1682 return nn; 1683 } 1684 1685 // Absorb any information from source. 1686 bool update_from(Node_Notes* source) { 1687 bool changed = false; 1688 if (source != NULL) { 1689 if (source->jvms() != NULL) { 1690 set_jvms(source->jvms()); 1691 changed = true; 1692 } 1693 } 1694 return changed; 1695 } 1696 }; 1697 1698 // Inlined accessors for Compile::node_nodes that require the preceding class: 1699 inline Node_Notes* 1700 Compile::locate_node_notes(GrowableArray<Node_Notes*>* arr, 1701 int idx, bool can_grow) { 1702 assert(idx >= 0, "oob"); 1703 int block_idx = (idx >> _log2_node_notes_block_size); 1704 int grow_by = (block_idx - (arr == NULL? 0: arr->length())); 1705 if (grow_by >= 0) { 1706 if (!can_grow) return NULL; 1707 grow_node_notes(arr, grow_by + 1); 1708 } 1709 if (arr == NULL) return NULL; 1710 // (Every element of arr is a sub-array of length _node_notes_block_size.) 1711 return arr->at(block_idx) + (idx & (_node_notes_block_size-1)); 1712 } 1713 1714 inline bool 1715 Compile::set_node_notes_at(int idx, Node_Notes* value) { 1716 if (value == NULL || value->is_clear()) 1717 return false; // nothing to write => write nothing 1718 Node_Notes* loc = locate_node_notes(_node_note_array, idx, true); 1719 assert(loc != NULL, ""); 1720 return loc->update_from(value); 1721 } 1722 1723 1724 //------------------------------TypeNode--------------------------------------- 1725 // Node with a Type constant. 1726 class TypeNode : public Node { 1727 protected: 1728 virtual uint hash() const; // Check the type 1729 virtual uint cmp( const Node &n ) const; 1730 virtual uint size_of() const; // Size is bigger 1731 const Type* const _type; 1732 public: 1733 void set_type(const Type* t) { 1734 assert(t != NULL, "sanity"); 1735 debug_only(uint check_hash = (VerifyHashTableKeys && _hash_lock) ? hash() : NO_HASH); 1736 *(const Type**)&_type = t; // cast away const-ness 1737 // If this node is in the hash table, make sure it doesn't need a rehash. 1738 assert(check_hash == NO_HASH || check_hash == hash(), "type change must preserve hash code"); 1739 } 1740 const Type* type() const { assert(_type != NULL, "sanity"); return _type; }; 1741 TypeNode( const Type *t, uint required ) : Node(required), _type(t) { 1742 init_class_id(Class_Type); 1743 } 1744 virtual const Type* Value(PhaseGVN* phase) const; 1745 virtual const Type *bottom_type() const; 1746 virtual uint ideal_reg() const; 1747 #ifndef PRODUCT 1748 virtual void dump_spec(outputStream *st) const; 1749 virtual void dump_compact_spec(outputStream *st) const; 1750 #endif 1751 }; 1752 1753 #endif // SHARE_VM_OPTO_NODE_HPP