1 /* 2 * Copyright (c) 1997, 2015, 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 CatchNode; 55 class CatchProjNode; 56 class CheckCastPPNode; 57 class ClearArrayNode; 58 class CmpNode; 59 class CodeBuffer; 60 class ConstraintCastNode; 61 class ConNode; 62 class CountedLoopNode; 63 class CountedLoopEndNode; 64 class DecodeNarrowPtrNode; 65 class DecodeNNode; 66 class DecodeNKlassNode; 67 class EncodeNarrowPtrNode; 68 class EncodePNode; 69 class EncodePKlassNode; 70 class FastLockNode; 71 class FastUnlockNode; 72 class IfNode; 73 class IfFalseNode; 74 class IfTrueNode; 75 class InitializeNode; 76 class JVMState; 77 class JumpNode; 78 class JumpProjNode; 79 class LoadNode; 80 class LoadStoreNode; 81 class LockNode; 82 class LoopNode; 83 class MachBranchNode; 84 class MachCallDynamicJavaNode; 85 class MachCallJavaNode; 86 class MachCallLeafNode; 87 class MachCallNode; 88 class MachCallRuntimeNode; 89 class MachCallStaticJavaNode; 90 class MachConstantBaseNode; 91 class MachConstantNode; 92 class MachGotoNode; 93 class MachIfNode; 94 class MachNode; 95 class MachNullCheckNode; 96 class MachProjNode; 97 class MachReturnNode; 98 class MachSafePointNode; 99 class MachSpillCopyNode; 100 class MachTempNode; 101 class MachMergeNode; 102 class Matcher; 103 class MemBarNode; 104 class MemBarStoreStoreNode; 105 class MemNode; 106 class MergeMemNode; 107 class MulNode; 108 class MultiNode; 109 class MultiBranchNode; 110 class NeverBranchNode; 111 class Node; 112 class Node_Array; 113 class Node_List; 114 class Node_Stack; 115 class NullCheckNode; 116 class OopMap; 117 class ParmNode; 118 class PCTableNode; 119 class PhaseCCP; 120 class PhaseGVN; 121 class PhaseIterGVN; 122 class PhaseRegAlloc; 123 class PhaseTransform; 124 class PhaseValues; 125 class PhiNode; 126 class Pipeline; 127 class ProjNode; 128 class RangeCheckNode; 129 class RegMask; 130 class RegionNode; 131 class RootNode; 132 class SafePointNode; 133 class SafePointScalarObjectNode; 134 class StartNode; 135 class State; 136 class StoreNode; 137 class SubNode; 138 class Type; 139 class TypeNode; 140 class UnlockNode; 141 class VectorNode; 142 class LoadVectorNode; 143 class StoreVectorNode; 144 class VectorSet; 145 typedef void (*NFunc)(Node&,void*); 146 extern "C" { 147 typedef int (*C_sort_func_t)(const void *, const void *); 148 } 149 150 // The type of all node counts and indexes. 151 // It must hold at least 16 bits, but must also be fast to load and store. 152 // This type, if less than 32 bits, could limit the number of possible nodes. 153 // (To make this type platform-specific, move to globalDefinitions_xxx.hpp.) 154 typedef unsigned int node_idx_t; 155 156 157 #ifndef OPTO_DU_ITERATOR_ASSERT 158 #ifdef ASSERT 159 #define OPTO_DU_ITERATOR_ASSERT 1 160 #else 161 #define OPTO_DU_ITERATOR_ASSERT 0 162 #endif 163 #endif //OPTO_DU_ITERATOR_ASSERT 164 165 #if OPTO_DU_ITERATOR_ASSERT 166 class DUIterator; 167 class DUIterator_Fast; 168 class DUIterator_Last; 169 #else 170 typedef uint DUIterator; 171 typedef Node** DUIterator_Fast; 172 typedef Node** DUIterator_Last; 173 #endif 174 175 // Node Sentinel 176 #define NodeSentinel (Node*)-1 177 178 // Unknown count frequency 179 #define COUNT_UNKNOWN (-1.0f) 180 181 //------------------------------Node------------------------------------------- 182 // Nodes define actions in the program. They create values, which have types. 183 // They are both vertices in a directed graph and program primitives. Nodes 184 // are labeled; the label is the "opcode", the primitive function in the lambda 185 // calculus sense that gives meaning to the Node. Node inputs are ordered (so 186 // that "a-b" is different from "b-a"). The inputs to a Node are the inputs to 187 // the Node's function. These inputs also define a Type equation for the Node. 188 // Solving these Type equations amounts to doing dataflow analysis. 189 // Control and data are uniformly represented in the graph. Finally, Nodes 190 // have a unique dense integer index which is used to index into side arrays 191 // whenever I have phase-specific information. 192 193 class Node { 194 friend class VMStructs; 195 196 // Lots of restrictions on cloning Nodes 197 Node(const Node&); // not defined; linker error to use these 198 Node &operator=(const Node &rhs); 199 200 public: 201 friend class Compile; 202 #if OPTO_DU_ITERATOR_ASSERT 203 friend class DUIterator_Common; 204 friend class DUIterator; 205 friend class DUIterator_Fast; 206 friend class DUIterator_Last; 207 #endif 208 209 // Because Nodes come and go, I define an Arena of Node structures to pull 210 // from. This should allow fast access to node creation & deletion. This 211 // field is a local cache of a value defined in some "program fragment" for 212 // which these Nodes are just a part of. 213 214 inline void* operator new(size_t x) throw() { 215 Compile* C = Compile::current(); 216 Node* n = (Node*)C->node_arena()->Amalloc_D(x); 217 #ifdef ASSERT 218 n->_in = (Node**)n; // magic cookie for assertion check 219 #endif 220 return (void*)n; 221 } 222 223 // Delete is a NOP 224 void operator delete( void *ptr ) {} 225 // Fancy destructor; eagerly attempt to reclaim Node numberings and storage 226 void destruct(); 227 228 // Create a new Node. Required is the number is of inputs required for 229 // semantic correctness. 230 Node( uint required ); 231 232 // Create a new Node with given input edges. 233 // This version requires use of the "edge-count" new. 234 // E.g. new (C,3) FooNode( C, NULL, left, right ); 235 Node( Node *n0 ); 236 Node( Node *n0, Node *n1 ); 237 Node( Node *n0, Node *n1, Node *n2 ); 238 Node( Node *n0, Node *n1, Node *n2, Node *n3 ); 239 Node( Node *n0, Node *n1, Node *n2, Node *n3, Node *n4 ); 240 Node( Node *n0, Node *n1, Node *n2, Node *n3, Node *n4, Node *n5 ); 241 Node( Node *n0, Node *n1, Node *n2, Node *n3, 242 Node *n4, Node *n5, Node *n6 ); 243 244 // Clone an inherited Node given only the base Node type. 245 Node* clone() const; 246 247 // Clone a Node, immediately supplying one or two new edges. 248 // The first and second arguments, if non-null, replace in(1) and in(2), 249 // respectively. 250 Node* clone_with_data_edge(Node* in1, Node* in2 = NULL) const { 251 Node* nn = clone(); 252 if (in1 != NULL) nn->set_req(1, in1); 253 if (in2 != NULL) nn->set_req(2, in2); 254 return nn; 255 } 256 257 private: 258 // Shared setup for the above constructors. 259 // Handles all interactions with Compile::current. 260 // Puts initial values in all Node fields except _idx. 261 // Returns the initial value for _idx, which cannot 262 // be initialized by assignment. 263 inline int Init(int req); 264 265 //----------------- input edge handling 266 protected: 267 friend class PhaseCFG; // Access to address of _in array elements 268 Node **_in; // Array of use-def references to Nodes 269 Node **_out; // Array of def-use references to Nodes 270 271 // Input edges are split into two categories. Required edges are required 272 // for semantic correctness; order is important and NULLs are allowed. 273 // Precedence edges are used to help determine execution order and are 274 // added, e.g., for scheduling purposes. They are unordered and not 275 // duplicated; they have no embedded NULLs. Edges from 0 to _cnt-1 276 // are required, from _cnt to _max-1 are precedence edges. 277 node_idx_t _cnt; // Total number of required Node inputs. 278 279 node_idx_t _max; // Actual length of input array. 280 281 // Output edges are an unordered list of def-use edges which exactly 282 // correspond to required input edges which point from other nodes 283 // to this one. Thus the count of the output edges is the number of 284 // users of this node. 285 node_idx_t _outcnt; // Total number of Node outputs. 286 287 node_idx_t _outmax; // Actual length of output array. 288 289 // Grow the actual input array to the next larger power-of-2 bigger than len. 290 void grow( uint len ); 291 // Grow the output array to the next larger power-of-2 bigger than len. 292 void out_grow( uint len ); 293 294 public: 295 // Each Node is assigned a unique small/dense number. This number is used 296 // to index into auxiliary arrays of data and bit vectors. 297 // The field _idx is declared constant to defend against inadvertent assignments, 298 // since it is used by clients as a naked field. However, the field's value can be 299 // changed using the set_idx() method. 300 // 301 // The PhaseRenumberLive phase renumbers nodes based on liveness information. 302 // Therefore, it updates the value of the _idx field. The parse-time _idx is 303 // preserved in _parse_idx. 304 const node_idx_t _idx; 305 DEBUG_ONLY(const node_idx_t _parse_idx;) 306 307 // Get the (read-only) number of input edges 308 uint req() const { return _cnt; } 309 uint len() const { return _max; } 310 // Get the (read-only) number of output edges 311 uint outcnt() const { return _outcnt; } 312 313 #if OPTO_DU_ITERATOR_ASSERT 314 // Iterate over the out-edges of this node. Deletions are illegal. 315 inline DUIterator outs() const; 316 // Use this when the out array might have changed to suppress asserts. 317 inline DUIterator& refresh_out_pos(DUIterator& i) const; 318 // Does the node have an out at this position? (Used for iteration.) 319 inline bool has_out(DUIterator& i) const; 320 inline Node* out(DUIterator& i) const; 321 // Iterate over the out-edges of this node. All changes are illegal. 322 inline DUIterator_Fast fast_outs(DUIterator_Fast& max) const; 323 inline Node* fast_out(DUIterator_Fast& i) const; 324 // Iterate over the out-edges of this node, deleting one at a time. 325 inline DUIterator_Last last_outs(DUIterator_Last& min) const; 326 inline Node* last_out(DUIterator_Last& i) const; 327 // The inline bodies of all these methods are after the iterator definitions. 328 #else 329 // Iterate over the out-edges of this node. Deletions are illegal. 330 // This iteration uses integral indexes, to decouple from array reallocations. 331 DUIterator outs() const { return 0; } 332 // Use this when the out array might have changed to suppress asserts. 333 DUIterator refresh_out_pos(DUIterator i) const { return i; } 334 335 // Reference to the i'th output Node. Error if out of bounds. 336 Node* out(DUIterator i) const { assert(i < _outcnt, "oob"); return _out[i]; } 337 // Does the node have an out at this position? (Used for iteration.) 338 bool has_out(DUIterator i) const { return i < _outcnt; } 339 340 // Iterate over the out-edges of this node. All changes are illegal. 341 // This iteration uses a pointer internal to the out array. 342 DUIterator_Fast fast_outs(DUIterator_Fast& max) const { 343 Node** out = _out; 344 // Assign a limit pointer to the reference argument: 345 max = out + (ptrdiff_t)_outcnt; 346 // Return the base pointer: 347 return out; 348 } 349 Node* fast_out(DUIterator_Fast i) const { return *i; } 350 // Iterate over the out-edges of this node, deleting one at a time. 351 // This iteration uses a pointer internal to the out array. 352 DUIterator_Last last_outs(DUIterator_Last& min) const { 353 Node** out = _out; 354 // Assign a limit pointer to the reference argument: 355 min = out; 356 // Return the pointer to the start of the iteration: 357 return out + (ptrdiff_t)_outcnt - 1; 358 } 359 Node* last_out(DUIterator_Last i) const { return *i; } 360 #endif 361 362 // Reference to the i'th input Node. Error if out of bounds. 363 Node* in(uint i) const { assert(i < _max, "oob: i=%d, _max=%d", i, _max); return _in[i]; } 364 // Reference to the i'th input Node. NULL if out of bounds. 365 Node* lookup(uint i) const { return ((i < _max) ? _in[i] : NULL); } 366 // Reference to the i'th output Node. Error if out of bounds. 367 // Use this accessor sparingly. We are going trying to use iterators instead. 368 Node* raw_out(uint i) const { assert(i < _outcnt,"oob"); return _out[i]; } 369 // Return the unique out edge. 370 Node* unique_out() const { assert(_outcnt==1,"not unique"); return _out[0]; } 371 // Delete out edge at position 'i' by moving last out edge to position 'i' 372 void raw_del_out(uint i) { 373 assert(i < _outcnt,"oob"); 374 assert(_outcnt > 0,"oob"); 375 #if OPTO_DU_ITERATOR_ASSERT 376 // Record that a change happened here. 377 debug_only(_last_del = _out[i]; ++_del_tick); 378 #endif 379 _out[i] = _out[--_outcnt]; 380 // Smash the old edge so it can't be used accidentally. 381 debug_only(_out[_outcnt] = (Node *)(uintptr_t)0xdeadbeef); 382 } 383 384 #ifdef ASSERT 385 bool is_dead() const; 386 #define is_not_dead(n) ((n) == NULL || !VerifyIterativeGVN || !((n)->is_dead())) 387 #endif 388 // Check whether node has become unreachable 389 bool is_unreachable(PhaseIterGVN &igvn) const; 390 391 // Set a required input edge, also updates corresponding output edge 392 void add_req( Node *n ); // Append a NEW required input 393 void add_req( Node *n0, Node *n1 ) { 394 add_req(n0); add_req(n1); } 395 void add_req( Node *n0, Node *n1, Node *n2 ) { 396 add_req(n0); add_req(n1); add_req(n2); } 397 void add_req_batch( Node* n, uint m ); // Append m NEW required inputs (all n). 398 void del_req( uint idx ); // Delete required edge & compact 399 void del_req_ordered( uint idx ); // Delete required edge & compact with preserved order 400 void ins_req( uint i, Node *n ); // Insert a NEW required input 401 void set_req( uint i, Node *n ) { 402 assert( is_not_dead(n), "can not use dead node"); 403 assert( i < _cnt, "oob: i=%d, _cnt=%d", i, _cnt); 404 assert( !VerifyHashTableKeys || _hash_lock == 0, 405 "remove node from hash table before modifying it"); 406 Node** p = &_in[i]; // cache this._in, across the del_out call 407 if (*p != NULL) (*p)->del_out((Node *)this); 408 (*p) = n; 409 if (n != NULL) n->add_out((Node *)this); 410 Compile::current()->record_modified_node(this); 411 } 412 // Light version of set_req() to init inputs after node creation. 413 void init_req( uint i, Node *n ) { 414 assert( i == 0 && this == n || 415 is_not_dead(n), "can not use dead node"); 416 assert( i < _cnt, "oob"); 417 assert( !VerifyHashTableKeys || _hash_lock == 0, 418 "remove node from hash table before modifying it"); 419 assert( _in[i] == NULL, "sanity"); 420 _in[i] = n; 421 if (n != NULL) n->add_out((Node *)this); 422 Compile::current()->record_modified_node(this); 423 } 424 // Find first occurrence of n among my edges: 425 int find_edge(Node* n); 426 int replace_edge(Node* old, Node* neww); 427 int replace_edges_in_range(Node* old, Node* neww, int start, int end); 428 // NULL out all inputs to eliminate incoming Def-Use edges. 429 // Return the number of edges between 'n' and 'this' 430 int disconnect_inputs(Node *n, Compile *c); 431 432 // Quickly, return true if and only if I am Compile::current()->top(). 433 bool is_top() const { 434 assert((this == (Node*) Compile::current()->top()) == (_out == NULL), ""); 435 return (_out == NULL); 436 } 437 // Reaffirm invariants for is_top. (Only from Compile::set_cached_top_node.) 438 void setup_is_top(); 439 440 // Strip away casting. (It is depth-limited.) 441 Node* uncast() const; 442 // Return whether two Nodes are equivalent, after stripping casting. 443 bool eqv_uncast(const Node* n) const { 444 return (this->uncast() == n->uncast()); 445 } 446 447 // Find out of current node that matches opcode. 448 Node* find_out_with(int opcode); 449 // Return true if the current node has an out that matches opcode. 450 bool has_out_with(int opcode); 451 // Return true if the current node has an out that matches any of the opcodes. 452 bool has_out_with(int opcode1, int opcode2, int opcode3, int opcode4); 453 454 private: 455 static Node* uncast_helper(const Node* n); 456 457 // Add an output edge to the end of the list 458 void add_out( Node *n ) { 459 if (is_top()) return; 460 if( _outcnt == _outmax ) out_grow(_outcnt); 461 _out[_outcnt++] = n; 462 } 463 // Delete an output edge 464 void del_out( Node *n ) { 465 if (is_top()) return; 466 Node** outp = &_out[_outcnt]; 467 // Find and remove n 468 do { 469 assert(outp > _out, "Missing Def-Use edge"); 470 } while (*--outp != n); 471 *outp = _out[--_outcnt]; 472 // Smash the old edge so it can't be used accidentally. 473 debug_only(_out[_outcnt] = (Node *)(uintptr_t)0xdeadbeef); 474 // Record that a change happened here. 475 #if OPTO_DU_ITERATOR_ASSERT 476 debug_only(_last_del = n; ++_del_tick); 477 #endif 478 } 479 480 public: 481 // Globally replace this node by a given new node, updating all uses. 482 void replace_by(Node* new_node); 483 // Globally replace this node by a given new node, updating all uses 484 // and cutting input edges of old node. 485 void subsume_by(Node* new_node, Compile* c) { 486 replace_by(new_node); 487 disconnect_inputs(NULL, c); 488 } 489 void set_req_X( uint i, Node *n, PhaseIterGVN *igvn ); 490 // Find the one non-null required input. RegionNode only 491 Node *nonnull_req() const; 492 // Add or remove precedence edges 493 void add_prec( Node *n ); 494 void rm_prec( uint i ); 495 void set_prec( uint i, Node *n ) { 496 assert( is_not_dead(n), "can not use dead node"); 497 assert( i >= _cnt, "not a precedence edge"); 498 if (_in[i] != NULL) _in[i]->del_out((Node *)this); 499 _in[i] = n; 500 if (n != NULL) n->add_out((Node *)this); 501 } 502 // Set this node's index, used by cisc_version to replace current node 503 void set_idx(uint new_idx) { 504 const node_idx_t* ref = &_idx; 505 *(node_idx_t*)ref = new_idx; 506 } 507 // Swap input edge order. (Edge indexes i1 and i2 are usually 1 and 2.) 508 void swap_edges(uint i1, uint i2) { 509 debug_only(uint check_hash = (VerifyHashTableKeys && _hash_lock) ? hash() : NO_HASH); 510 // Def-Use info is unchanged 511 Node* n1 = in(i1); 512 Node* n2 = in(i2); 513 _in[i1] = n2; 514 _in[i2] = n1; 515 // If this node is in the hash table, make sure it doesn't need a rehash. 516 assert(check_hash == NO_HASH || check_hash == hash(), "edge swap must preserve hash code"); 517 } 518 519 // Iterators over input Nodes for a Node X are written as: 520 // for( i = 0; i < X.req(); i++ ) ... X[i] ... 521 // NOTE: Required edges can contain embedded NULL pointers. 522 523 //----------------- Other Node Properties 524 525 // Generate class IDs for (some) ideal nodes so that it is possible to determine 526 // the type of a node using a non-virtual method call (the method is_<Node>() below). 527 // 528 // A class ID of an ideal node is a set of bits. In a class ID, a single bit determines 529 // the type of the node the ID represents; another subset of an ID's bits are reserved 530 // for the superclasses of the node represented by the ID. 531 // 532 // By design, if A is a supertype of B, A.is_B() returns true and B.is_A() 533 // returns false. A.is_A() returns true. 534 // 535 // If two classes, A and B, have the same superclass, a different bit of A's class id 536 // is reserved for A's type than for B's type. That bit is specified by the third 537 // parameter in the macro DEFINE_CLASS_ID. 538 // 539 // By convention, classes with deeper hierarchy are declared first. Moreover, 540 // classes with the same hierarchy depth are sorted by usage frequency. 541 // 542 // The query method masks the bits to cut off bits of subclasses and then compares 543 // the result with the class id (see the macro DEFINE_CLASS_QUERY below). 544 // 545 // Class_MachCall=30, ClassMask_MachCall=31 546 // 12 8 4 0 547 // 0 0 0 0 0 0 0 0 1 1 1 1 0 548 // | | | | 549 // | | | Bit_Mach=2 550 // | | Bit_MachReturn=4 551 // | Bit_MachSafePoint=8 552 // Bit_MachCall=16 553 // 554 // Class_CountedLoop=56, ClassMask_CountedLoop=63 555 // 12 8 4 0 556 // 0 0 0 0 0 0 0 1 1 1 0 0 0 557 // | | | 558 // | | Bit_Region=8 559 // | Bit_Loop=16 560 // Bit_CountedLoop=32 561 562 #define DEFINE_CLASS_ID(cl, supcl, subn) \ 563 Bit_##cl = (Class_##supcl == 0) ? 1 << subn : (Bit_##supcl) << (1 + subn) , \ 564 Class_##cl = Class_##supcl + Bit_##cl , \ 565 ClassMask_##cl = ((Bit_##cl << 1) - 1) , 566 567 // This enum is used only for C2 ideal and mach nodes with is_<node>() methods 568 // so that it's values fits into 16 bits. 569 enum NodeClasses { 570 Bit_Node = 0x0000, 571 Class_Node = 0x0000, 572 ClassMask_Node = 0xFFFF, 573 574 DEFINE_CLASS_ID(Multi, Node, 0) 575 DEFINE_CLASS_ID(SafePoint, Multi, 0) 576 DEFINE_CLASS_ID(Call, SafePoint, 0) 577 DEFINE_CLASS_ID(CallJava, Call, 0) 578 DEFINE_CLASS_ID(CallStaticJava, CallJava, 0) 579 DEFINE_CLASS_ID(CallDynamicJava, CallJava, 1) 580 DEFINE_CLASS_ID(CallRuntime, Call, 1) 581 DEFINE_CLASS_ID(CallLeaf, CallRuntime, 0) 582 DEFINE_CLASS_ID(Allocate, Call, 2) 583 DEFINE_CLASS_ID(AllocateArray, Allocate, 0) 584 DEFINE_CLASS_ID(AbstractLock, Call, 3) 585 DEFINE_CLASS_ID(Lock, AbstractLock, 0) 586 DEFINE_CLASS_ID(Unlock, AbstractLock, 1) 587 DEFINE_CLASS_ID(ArrayCopy, Call, 4) 588 DEFINE_CLASS_ID(MultiBranch, Multi, 1) 589 DEFINE_CLASS_ID(PCTable, MultiBranch, 0) 590 DEFINE_CLASS_ID(Catch, PCTable, 0) 591 DEFINE_CLASS_ID(Jump, PCTable, 1) 592 DEFINE_CLASS_ID(If, MultiBranch, 1) 593 DEFINE_CLASS_ID(CountedLoopEnd, If, 0) 594 DEFINE_CLASS_ID(RangeCheck, If, 1) 595 DEFINE_CLASS_ID(NeverBranch, MultiBranch, 2) 596 DEFINE_CLASS_ID(Start, Multi, 2) 597 DEFINE_CLASS_ID(MemBar, Multi, 3) 598 DEFINE_CLASS_ID(Initialize, MemBar, 0) 599 DEFINE_CLASS_ID(MemBarStoreStore, MemBar, 1) 600 601 DEFINE_CLASS_ID(Mach, Node, 1) 602 DEFINE_CLASS_ID(MachReturn, Mach, 0) 603 DEFINE_CLASS_ID(MachSafePoint, MachReturn, 0) 604 DEFINE_CLASS_ID(MachCall, MachSafePoint, 0) 605 DEFINE_CLASS_ID(MachCallJava, MachCall, 0) 606 DEFINE_CLASS_ID(MachCallStaticJava, MachCallJava, 0) 607 DEFINE_CLASS_ID(MachCallDynamicJava, MachCallJava, 1) 608 DEFINE_CLASS_ID(MachCallRuntime, MachCall, 1) 609 DEFINE_CLASS_ID(MachCallLeaf, MachCallRuntime, 0) 610 DEFINE_CLASS_ID(MachBranch, Mach, 1) 611 DEFINE_CLASS_ID(MachIf, MachBranch, 0) 612 DEFINE_CLASS_ID(MachGoto, MachBranch, 1) 613 DEFINE_CLASS_ID(MachNullCheck, MachBranch, 2) 614 DEFINE_CLASS_ID(MachSpillCopy, Mach, 2) 615 DEFINE_CLASS_ID(MachTemp, Mach, 3) 616 DEFINE_CLASS_ID(MachConstantBase, Mach, 4) 617 DEFINE_CLASS_ID(MachConstant, Mach, 5) 618 DEFINE_CLASS_ID(MachMerge, Mach, 6) 619 620 DEFINE_CLASS_ID(Type, Node, 2) 621 DEFINE_CLASS_ID(Phi, Type, 0) 622 DEFINE_CLASS_ID(ConstraintCast, Type, 1) 623 DEFINE_CLASS_ID(CheckCastPP, Type, 2) 624 DEFINE_CLASS_ID(CMove, Type, 3) 625 DEFINE_CLASS_ID(SafePointScalarObject, Type, 4) 626 DEFINE_CLASS_ID(DecodeNarrowPtr, Type, 5) 627 DEFINE_CLASS_ID(DecodeN, DecodeNarrowPtr, 0) 628 DEFINE_CLASS_ID(DecodeNKlass, DecodeNarrowPtr, 1) 629 DEFINE_CLASS_ID(EncodeNarrowPtr, Type, 6) 630 DEFINE_CLASS_ID(EncodeP, EncodeNarrowPtr, 0) 631 DEFINE_CLASS_ID(EncodePKlass, EncodeNarrowPtr, 1) 632 633 DEFINE_CLASS_ID(Proj, Node, 3) 634 DEFINE_CLASS_ID(CatchProj, Proj, 0) 635 DEFINE_CLASS_ID(JumpProj, Proj, 1) 636 DEFINE_CLASS_ID(IfTrue, Proj, 2) 637 DEFINE_CLASS_ID(IfFalse, Proj, 3) 638 DEFINE_CLASS_ID(Parm, Proj, 4) 639 DEFINE_CLASS_ID(MachProj, Proj, 5) 640 641 DEFINE_CLASS_ID(Mem, Node, 4) 642 DEFINE_CLASS_ID(Load, Mem, 0) 643 DEFINE_CLASS_ID(LoadVector, Load, 0) 644 DEFINE_CLASS_ID(Store, Mem, 1) 645 DEFINE_CLASS_ID(StoreVector, Store, 0) 646 DEFINE_CLASS_ID(LoadStore, Mem, 2) 647 648 DEFINE_CLASS_ID(Region, Node, 5) 649 DEFINE_CLASS_ID(Loop, Region, 0) 650 DEFINE_CLASS_ID(Root, Loop, 0) 651 DEFINE_CLASS_ID(CountedLoop, Loop, 1) 652 653 DEFINE_CLASS_ID(Sub, Node, 6) 654 DEFINE_CLASS_ID(Cmp, Sub, 0) 655 DEFINE_CLASS_ID(FastLock, Cmp, 0) 656 DEFINE_CLASS_ID(FastUnlock, Cmp, 1) 657 658 DEFINE_CLASS_ID(MergeMem, Node, 7) 659 DEFINE_CLASS_ID(Bool, Node, 8) 660 DEFINE_CLASS_ID(AddP, Node, 9) 661 DEFINE_CLASS_ID(BoxLock, Node, 10) 662 DEFINE_CLASS_ID(Add, Node, 11) 663 DEFINE_CLASS_ID(Mul, Node, 12) 664 DEFINE_CLASS_ID(Vector, Node, 13) 665 DEFINE_CLASS_ID(ClearArray, Node, 14) 666 667 _max_classes = ClassMask_ClearArray 668 }; 669 #undef DEFINE_CLASS_ID 670 671 // Flags are sorted by usage frequency. 672 enum NodeFlags { 673 Flag_is_Copy = 0x01, // should be first bit to avoid shift 674 Flag_rematerialize = Flag_is_Copy << 1, 675 Flag_needs_anti_dependence_check = Flag_rematerialize << 1, 676 Flag_is_macro = Flag_needs_anti_dependence_check << 1, 677 Flag_is_Con = Flag_is_macro << 1, 678 Flag_is_cisc_alternate = Flag_is_Con << 1, 679 Flag_is_dead_loop_safe = Flag_is_cisc_alternate << 1, 680 Flag_may_be_short_branch = Flag_is_dead_loop_safe << 1, 681 Flag_avoid_back_to_back_before = Flag_may_be_short_branch << 1, 682 Flag_avoid_back_to_back_after = Flag_avoid_back_to_back_before << 1, 683 Flag_has_call = Flag_avoid_back_to_back_after << 1, 684 Flag_is_reduction = Flag_has_call << 1, 685 Flag_is_scheduled = Flag_is_reduction, 686 Flag_is_expensive = Flag_is_scheduled << 1, 687 _max_flags = (Flag_is_expensive << 1) - 1 // allow flags combination 688 }; 689 690 private: 691 jushort _class_id; 692 jushort _flags; 693 694 protected: 695 // These methods should be called from constructors only. 696 void init_class_id(jushort c) { 697 assert(c <= _max_classes, "invalid node class"); 698 _class_id = c; // cast out const 699 } 700 void init_flags(jushort fl) { 701 assert(fl <= _max_flags, "invalid node flag"); 702 _flags |= fl; 703 } 704 void clear_flag(jushort fl) { 705 assert(fl <= _max_flags, "invalid node flag"); 706 _flags &= ~fl; 707 } 708 709 public: 710 const jushort class_id() const { return _class_id; } 711 712 const jushort flags() const { return _flags; } 713 714 void add_flag(jushort fl) { init_flags(fl); } 715 716 void remove_flag(jushort fl) { clear_flag(fl); } 717 718 // Return a dense integer opcode number 719 virtual int Opcode() const; 720 721 // Virtual inherited Node size 722 virtual uint size_of() const; 723 724 // Other interesting Node properties 725 #define DEFINE_CLASS_QUERY(type) \ 726 bool is_##type() const { \ 727 return ((_class_id & ClassMask_##type) == Class_##type); \ 728 } \ 729 type##Node *as_##type() const { \ 730 assert(is_##type(), "invalid node class"); \ 731 return (type##Node*)this; \ 732 } \ 733 type##Node* isa_##type() const { \ 734 return (is_##type()) ? as_##type() : NULL; \ 735 } 736 737 DEFINE_CLASS_QUERY(AbstractLock) 738 DEFINE_CLASS_QUERY(Add) 739 DEFINE_CLASS_QUERY(AddP) 740 DEFINE_CLASS_QUERY(Allocate) 741 DEFINE_CLASS_QUERY(AllocateArray) 742 DEFINE_CLASS_QUERY(ArrayCopy) 743 DEFINE_CLASS_QUERY(Bool) 744 DEFINE_CLASS_QUERY(BoxLock) 745 DEFINE_CLASS_QUERY(Call) 746 DEFINE_CLASS_QUERY(CallDynamicJava) 747 DEFINE_CLASS_QUERY(CallJava) 748 DEFINE_CLASS_QUERY(CallLeaf) 749 DEFINE_CLASS_QUERY(CallRuntime) 750 DEFINE_CLASS_QUERY(CallStaticJava) 751 DEFINE_CLASS_QUERY(Catch) 752 DEFINE_CLASS_QUERY(CatchProj) 753 DEFINE_CLASS_QUERY(CheckCastPP) 754 DEFINE_CLASS_QUERY(ConstraintCast) 755 DEFINE_CLASS_QUERY(ClearArray) 756 DEFINE_CLASS_QUERY(CMove) 757 DEFINE_CLASS_QUERY(Cmp) 758 DEFINE_CLASS_QUERY(CountedLoop) 759 DEFINE_CLASS_QUERY(CountedLoopEnd) 760 DEFINE_CLASS_QUERY(DecodeNarrowPtr) 761 DEFINE_CLASS_QUERY(DecodeN) 762 DEFINE_CLASS_QUERY(DecodeNKlass) 763 DEFINE_CLASS_QUERY(EncodeNarrowPtr) 764 DEFINE_CLASS_QUERY(EncodeP) 765 DEFINE_CLASS_QUERY(EncodePKlass) 766 DEFINE_CLASS_QUERY(FastLock) 767 DEFINE_CLASS_QUERY(FastUnlock) 768 DEFINE_CLASS_QUERY(If) 769 DEFINE_CLASS_QUERY(RangeCheck) 770 DEFINE_CLASS_QUERY(IfFalse) 771 DEFINE_CLASS_QUERY(IfTrue) 772 DEFINE_CLASS_QUERY(Initialize) 773 DEFINE_CLASS_QUERY(Jump) 774 DEFINE_CLASS_QUERY(JumpProj) 775 DEFINE_CLASS_QUERY(Load) 776 DEFINE_CLASS_QUERY(LoadStore) 777 DEFINE_CLASS_QUERY(Lock) 778 DEFINE_CLASS_QUERY(Loop) 779 DEFINE_CLASS_QUERY(Mach) 780 DEFINE_CLASS_QUERY(MachBranch) 781 DEFINE_CLASS_QUERY(MachCall) 782 DEFINE_CLASS_QUERY(MachCallDynamicJava) 783 DEFINE_CLASS_QUERY(MachCallJava) 784 DEFINE_CLASS_QUERY(MachCallLeaf) 785 DEFINE_CLASS_QUERY(MachCallRuntime) 786 DEFINE_CLASS_QUERY(MachCallStaticJava) 787 DEFINE_CLASS_QUERY(MachConstantBase) 788 DEFINE_CLASS_QUERY(MachConstant) 789 DEFINE_CLASS_QUERY(MachGoto) 790 DEFINE_CLASS_QUERY(MachIf) 791 DEFINE_CLASS_QUERY(MachNullCheck) 792 DEFINE_CLASS_QUERY(MachProj) 793 DEFINE_CLASS_QUERY(MachReturn) 794 DEFINE_CLASS_QUERY(MachSafePoint) 795 DEFINE_CLASS_QUERY(MachSpillCopy) 796 DEFINE_CLASS_QUERY(MachTemp) 797 DEFINE_CLASS_QUERY(MachMerge) 798 DEFINE_CLASS_QUERY(Mem) 799 DEFINE_CLASS_QUERY(MemBar) 800 DEFINE_CLASS_QUERY(MemBarStoreStore) 801 DEFINE_CLASS_QUERY(MergeMem) 802 DEFINE_CLASS_QUERY(Mul) 803 DEFINE_CLASS_QUERY(Multi) 804 DEFINE_CLASS_QUERY(MultiBranch) 805 DEFINE_CLASS_QUERY(Parm) 806 DEFINE_CLASS_QUERY(PCTable) 807 DEFINE_CLASS_QUERY(Phi) 808 DEFINE_CLASS_QUERY(Proj) 809 DEFINE_CLASS_QUERY(Region) 810 DEFINE_CLASS_QUERY(Root) 811 DEFINE_CLASS_QUERY(SafePoint) 812 DEFINE_CLASS_QUERY(SafePointScalarObject) 813 DEFINE_CLASS_QUERY(Start) 814 DEFINE_CLASS_QUERY(Store) 815 DEFINE_CLASS_QUERY(Sub) 816 DEFINE_CLASS_QUERY(Type) 817 DEFINE_CLASS_QUERY(Vector) 818 DEFINE_CLASS_QUERY(LoadVector) 819 DEFINE_CLASS_QUERY(StoreVector) 820 DEFINE_CLASS_QUERY(Unlock) 821 822 #undef DEFINE_CLASS_QUERY 823 824 // duplicate of is_MachSpillCopy() 825 bool is_SpillCopy () const { 826 return ((_class_id & ClassMask_MachSpillCopy) == Class_MachSpillCopy); 827 } 828 829 bool is_Con () const { return (_flags & Flag_is_Con) != 0; } 830 // The data node which is safe to leave in dead loop during IGVN optimization. 831 bool is_dead_loop_safe() const { 832 return is_Phi() || (is_Proj() && in(0) == NULL) || 833 ((_flags & (Flag_is_dead_loop_safe | Flag_is_Con)) != 0 && 834 (!is_Proj() || !in(0)->is_Allocate())); 835 } 836 837 // is_Copy() returns copied edge index (0 or 1) 838 uint is_Copy() const { return (_flags & Flag_is_Copy); } 839 840 virtual bool is_CFG() const { return false; } 841 842 // If this node is control-dependent on a test, can it be 843 // rerouted to a dominating equivalent test? This is usually 844 // true of non-CFG nodes, but can be false for operations which 845 // depend for their correct sequencing on more than one test. 846 // (In that case, hoisting to a dominating test may silently 847 // skip some other important test.) 848 virtual bool depends_only_on_test() const { assert(!is_CFG(), ""); return true; }; 849 850 // When building basic blocks, I need to have a notion of block beginning 851 // Nodes, next block selector Nodes (block enders), and next block 852 // projections. These calls need to work on their machine equivalents. The 853 // Ideal beginning Nodes are RootNode, RegionNode and StartNode. 854 bool is_block_start() const { 855 if ( is_Region() ) 856 return this == (const Node*)in(0); 857 else 858 return is_Start(); 859 } 860 861 // The Ideal control projection Nodes are IfTrue/IfFalse, JumpProjNode, Root, 862 // Goto and Return. This call also returns the block ending Node. 863 virtual const Node *is_block_proj() const; 864 865 // The node is a "macro" node which needs to be expanded before matching 866 bool is_macro() const { return (_flags & Flag_is_macro) != 0; } 867 // The node is expensive: the best control is set during loop opts 868 bool is_expensive() const { return (_flags & Flag_is_expensive) != 0 && in(0) != NULL; } 869 870 // An arithmetic node which accumulates a data in a loop. 871 // It must have the loop's phi as input and provide a def to the phi. 872 bool is_reduction() const { return (_flags & Flag_is_reduction) != 0; } 873 874 // Used in lcm to mark nodes that have scheduled 875 bool is_scheduled() const { return (_flags & Flag_is_scheduled) != 0; } 876 877 //----------------- Optimization 878 879 // Get the worst-case Type output for this Node. 880 virtual const class Type *bottom_type() const; 881 882 // If we find a better type for a node, try to record it permanently. 883 // Return true if this node actually changed. 884 // Be sure to do the hash_delete game in the "rehash" variant. 885 void raise_bottom_type(const Type* new_type); 886 887 // Get the address type with which this node uses and/or defs memory, 888 // or NULL if none. The address type is conservatively wide. 889 // Returns non-null for calls, membars, loads, stores, etc. 890 // Returns TypePtr::BOTTOM if the node touches memory "broadly". 891 virtual const class TypePtr *adr_type() const { return NULL; } 892 893 // Return an existing node which computes the same function as this node. 894 // The optimistic combined algorithm requires this to return a Node which 895 // is a small number of steps away (e.g., one of my inputs). 896 virtual Node *Identity( PhaseTransform *phase ); 897 898 // Return the set of values this Node can take on at runtime. 899 virtual const Type *Value( PhaseTransform *phase ) const; 900 901 // Return a node which is more "ideal" than the current node. 902 // The invariants on this call are subtle. If in doubt, read the 903 // treatise in node.cpp above the default implemention AND TEST WITH 904 // +VerifyIterativeGVN! 905 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 906 907 // Some nodes have specific Ideal subgraph transformations only if they are 908 // unique users of specific nodes. Such nodes should be put on IGVN worklist 909 // for the transformations to happen. 910 bool has_special_unique_user() const; 911 912 // Skip Proj and CatchProj nodes chains. Check for Null and Top. 913 Node* find_exact_control(Node* ctrl); 914 915 // Check if 'this' node dominates or equal to 'sub'. 916 bool dominates(Node* sub, Node_List &nlist); 917 918 protected: 919 bool remove_dead_region(PhaseGVN *phase, bool can_reshape); 920 public: 921 922 // See if there is valid pipeline info 923 static const Pipeline *pipeline_class(); 924 virtual const Pipeline *pipeline() const; 925 926 // Compute the latency from the def to this instruction of the ith input node 927 uint latency(uint i); 928 929 // Hash & compare functions, for pessimistic value numbering 930 931 // If the hash function returns the special sentinel value NO_HASH, 932 // the node is guaranteed never to compare equal to any other node. 933 // If we accidentally generate a hash with value NO_HASH the node 934 // won't go into the table and we'll lose a little optimization. 935 enum { NO_HASH = 0 }; 936 virtual uint hash() const; 937 virtual uint cmp( const Node &n ) const; 938 939 // Operation appears to be iteratively computed (such as an induction variable) 940 // It is possible for this operation to return false for a loop-varying 941 // value, if it appears (by local graph inspection) to be computed by a simple conditional. 942 bool is_iteratively_computed(); 943 944 // Determine if a node is Counted loop induction variable. 945 // The method is defined in loopnode.cpp. 946 const Node* is_loop_iv() const; 947 948 // Return a node with opcode "opc" and same inputs as "this" if one can 949 // be found; Otherwise return NULL; 950 Node* find_similar(int opc); 951 952 // Return the unique control out if only one. Null if none or more than one. 953 Node* unique_ctrl_out() const; 954 955 // Set control or add control as precedence edge 956 void ensure_control_or_add_prec(Node* c); 957 958 //----------------- Code Generation 959 960 // Ideal register class for Matching. Zero means unmatched instruction 961 // (these are cloned instead of converted to machine nodes). 962 virtual uint ideal_reg() const; 963 964 static const uint NotAMachineReg; // must be > max. machine register 965 966 // Do we Match on this edge index or not? Generally false for Control 967 // and true for everything else. Weird for calls & returns. 968 virtual uint match_edge(uint idx) const; 969 970 // Register class output is returned in 971 virtual const RegMask &out_RegMask() const; 972 // Register class input is expected in 973 virtual const RegMask &in_RegMask(uint) const; 974 // Should we clone rather than spill this instruction? 975 bool rematerialize() const; 976 977 // Return JVM State Object if this Node carries debug info, or NULL otherwise 978 virtual JVMState* jvms() const; 979 980 // Print as assembly 981 virtual void format( PhaseRegAlloc *, outputStream* st = tty ) const; 982 // Emit bytes starting at parameter 'ptr' 983 // Bump 'ptr' by the number of output bytes 984 virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const; 985 // Size of instruction in bytes 986 virtual uint size(PhaseRegAlloc *ra_) const; 987 988 // Convenience function to extract an integer constant from a node. 989 // If it is not an integer constant (either Con, CastII, or Mach), 990 // return value_if_unknown. 991 jint find_int_con(jint value_if_unknown) const { 992 const TypeInt* t = find_int_type(); 993 return (t != NULL && t->is_con()) ? t->get_con() : value_if_unknown; 994 } 995 // Return the constant, knowing it is an integer constant already 996 jint get_int() const { 997 const TypeInt* t = find_int_type(); 998 guarantee(t != NULL, "must be con"); 999 return t->get_con(); 1000 } 1001 // Here's where the work is done. Can produce non-constant int types too. 1002 const TypeInt* find_int_type() const; 1003 1004 // Same thing for long (and intptr_t, via type.hpp): 1005 jlong get_long() const { 1006 const TypeLong* t = find_long_type(); 1007 guarantee(t != NULL, "must be con"); 1008 return t->get_con(); 1009 } 1010 jlong find_long_con(jint value_if_unknown) const { 1011 const TypeLong* t = find_long_type(); 1012 return (t != NULL && t->is_con()) ? t->get_con() : value_if_unknown; 1013 } 1014 const TypeLong* find_long_type() const; 1015 1016 const TypePtr* get_ptr_type() const; 1017 1018 // These guys are called by code generated by ADLC: 1019 intptr_t get_ptr() const; 1020 intptr_t get_narrowcon() const; 1021 jdouble getd() const; 1022 jfloat getf() const; 1023 1024 // Nodes which are pinned into basic blocks 1025 virtual bool pinned() const { return false; } 1026 1027 // Nodes which use memory without consuming it, hence need antidependences 1028 // More specifically, needs_anti_dependence_check returns true iff the node 1029 // (a) does a load, and (b) does not perform a store (except perhaps to a 1030 // stack slot or some other unaliased location). 1031 bool needs_anti_dependence_check() const; 1032 1033 // Return which operand this instruction may cisc-spill. In other words, 1034 // return operand position that can convert from reg to memory access 1035 virtual int cisc_operand() const { return AdlcVMDeps::Not_cisc_spillable; } 1036 bool is_cisc_alternate() const { return (_flags & Flag_is_cisc_alternate) != 0; } 1037 1038 //----------------- Graph walking 1039 public: 1040 // Walk and apply member functions recursively. 1041 // Supplied (this) pointer is root. 1042 void walk(NFunc pre, NFunc post, void *env); 1043 static void nop(Node &, void*); // Dummy empty function 1044 static void packregion( Node &n, void* ); 1045 private: 1046 void walk_(NFunc pre, NFunc post, void *env, VectorSet &visited); 1047 1048 //----------------- Printing, etc 1049 public: 1050 #ifndef PRODUCT 1051 Node* find(int idx) const; // Search the graph for the given idx. 1052 Node* find_ctrl(int idx) const; // Search control ancestors for the given idx. 1053 void dump() const { dump("\n"); } // Print this node. 1054 void dump(const char* suffix, bool mark = false, outputStream *st = tty) const; // Print this node. 1055 void dump(int depth) const; // Print this node, recursively to depth d 1056 void dump_ctrl(int depth) const; // Print control nodes, to depth d 1057 void dump_comp() const; // Print this node in compact representation. 1058 // Print this node in compact representation. 1059 void dump_comp(const char* suffix, outputStream *st = tty) const; 1060 virtual void dump_req(outputStream *st = tty) const; // Print required-edge info 1061 virtual void dump_prec(outputStream *st = tty) const; // Print precedence-edge info 1062 virtual void dump_out(outputStream *st = tty) const; // Print the output edge info 1063 virtual void dump_spec(outputStream *st) const {}; // Print per-node info 1064 // Print compact per-node info 1065 virtual void dump_compact_spec(outputStream *st) const { dump_spec(st); } 1066 void dump_related() const; // Print related nodes (depends on node at hand). 1067 // Print related nodes up to given depths for input and output nodes. 1068 void dump_related(uint d_in, uint d_out) const; 1069 void dump_related_compact() const; // Print related nodes in compact representation. 1070 // Collect related nodes. 1071 virtual void related(GrowableArray<Node*> *in_rel, GrowableArray<Node*> *out_rel, bool compact) const; 1072 // Collect nodes starting from this node, explicitly including/excluding control and data links. 1073 void collect_nodes(GrowableArray<Node*> *ns, int d, bool ctrl, bool data) const; 1074 1075 // Node collectors, to be used in implementations of Node::rel(). 1076 // Collect the entire data input graph. Include control inputs if requested. 1077 void collect_nodes_in_all_data(GrowableArray<Node*> *ns, bool ctrl) const; 1078 // Collect the entire control input graph. Include data inputs if requested. 1079 void collect_nodes_in_all_ctrl(GrowableArray<Node*> *ns, bool data) const; 1080 // Collect the entire output graph until hitting and including control nodes. 1081 void collect_nodes_out_all_ctrl_boundary(GrowableArray<Node*> *ns) const; 1082 1083 void verify_edges(Unique_Node_List &visited); // Verify bi-directional edges 1084 void verify() const; // Check Def-Use info for my subgraph 1085 static void verify_recur(const Node *n, int verify_depth, VectorSet &old_space, VectorSet &new_space); 1086 1087 // This call defines a class-unique string used to identify class instances 1088 virtual const char *Name() const; 1089 1090 void dump_format(PhaseRegAlloc *ra) const; // debug access to MachNode::format(...) 1091 // RegMask Print Functions 1092 void dump_in_regmask(int idx) { in_RegMask(idx).dump(); } 1093 void dump_out_regmask() { out_RegMask().dump(); } 1094 static bool in_dump() { return Compile::current()->_in_dump_cnt > 0; } 1095 void fast_dump() const { 1096 tty->print("%4d: %-17s", _idx, Name()); 1097 for (uint i = 0; i < len(); i++) 1098 if (in(i)) 1099 tty->print(" %4d", in(i)->_idx); 1100 else 1101 tty->print(" NULL"); 1102 tty->print("\n"); 1103 } 1104 #endif 1105 #ifdef ASSERT 1106 void verify_construction(); 1107 bool verify_jvms(const JVMState* jvms) const; 1108 int _debug_idx; // Unique value assigned to every node. 1109 int debug_idx() const { return _debug_idx; } 1110 void set_debug_idx( int debug_idx ) { _debug_idx = debug_idx; } 1111 1112 Node* _debug_orig; // Original version of this, if any. 1113 Node* debug_orig() const { return _debug_orig; } 1114 void set_debug_orig(Node* orig); // _debug_orig = orig 1115 1116 int _hash_lock; // Barrier to modifications of nodes in the hash table 1117 void enter_hash_lock() { ++_hash_lock; assert(_hash_lock < 99, "in too many hash tables?"); } 1118 void exit_hash_lock() { --_hash_lock; assert(_hash_lock >= 0, "mispaired hash locks"); } 1119 1120 static void init_NodeProperty(); 1121 1122 #if OPTO_DU_ITERATOR_ASSERT 1123 const Node* _last_del; // The last deleted node. 1124 uint _del_tick; // Bumped when a deletion happens.. 1125 #endif 1126 #endif 1127 }; 1128 1129 1130 #ifndef PRODUCT 1131 1132 // Used in debugging code to avoid walking across dead or uninitialized edges. 1133 inline bool NotANode(const Node* n) { 1134 if (n == NULL) return true; 1135 if (((intptr_t)n & 1) != 0) return true; // uninitialized, etc. 1136 if (*(address*)n == badAddress) return true; // kill by Node::destruct 1137 return false; 1138 } 1139 1140 #endif 1141 1142 1143 //----------------------------------------------------------------------------- 1144 // Iterators over DU info, and associated Node functions. 1145 1146 #if OPTO_DU_ITERATOR_ASSERT 1147 1148 // Common code for assertion checking on DU iterators. 1149 class DUIterator_Common VALUE_OBJ_CLASS_SPEC { 1150 #ifdef ASSERT 1151 protected: 1152 bool _vdui; // cached value of VerifyDUIterators 1153 const Node* _node; // the node containing the _out array 1154 uint _outcnt; // cached node->_outcnt 1155 uint _del_tick; // cached node->_del_tick 1156 Node* _last; // last value produced by the iterator 1157 1158 void sample(const Node* node); // used by c'tor to set up for verifies 1159 void verify(const Node* node, bool at_end_ok = false); 1160 void verify_resync(); 1161 void reset(const DUIterator_Common& that); 1162 1163 // The VDUI_ONLY macro protects code conditionalized on VerifyDUIterators 1164 #define I_VDUI_ONLY(i,x) { if ((i)._vdui) { x; } } 1165 #else 1166 #define I_VDUI_ONLY(i,x) { } 1167 #endif //ASSERT 1168 }; 1169 1170 #define VDUI_ONLY(x) I_VDUI_ONLY(*this, x) 1171 1172 // Default DU iterator. Allows appends onto the out array. 1173 // Allows deletion from the out array only at the current point. 1174 // Usage: 1175 // for (DUIterator i = x->outs(); x->has_out(i); i++) { 1176 // Node* y = x->out(i); 1177 // ... 1178 // } 1179 // Compiles in product mode to a unsigned integer index, which indexes 1180 // onto a repeatedly reloaded base pointer of x->_out. The loop predicate 1181 // also reloads x->_outcnt. If you delete, you must perform "--i" just 1182 // before continuing the loop. You must delete only the last-produced 1183 // edge. You must delete only a single copy of the last-produced edge, 1184 // or else you must delete all copies at once (the first time the edge 1185 // is produced by the iterator). 1186 class DUIterator : public DUIterator_Common { 1187 friend class Node; 1188 1189 // This is the index which provides the product-mode behavior. 1190 // Whatever the product-mode version of the system does to the 1191 // DUI index is done to this index. All other fields in 1192 // this class are used only for assertion checking. 1193 uint _idx; 1194 1195 #ifdef ASSERT 1196 uint _refresh_tick; // Records the refresh activity. 1197 1198 void sample(const Node* node); // Initialize _refresh_tick etc. 1199 void verify(const Node* node, bool at_end_ok = false); 1200 void verify_increment(); // Verify an increment operation. 1201 void verify_resync(); // Verify that we can back up over a deletion. 1202 void verify_finish(); // Verify that the loop terminated properly. 1203 void refresh(); // Resample verification info. 1204 void reset(const DUIterator& that); // Resample after assignment. 1205 #endif 1206 1207 DUIterator(const Node* node, int dummy_to_avoid_conversion) 1208 { _idx = 0; debug_only(sample(node)); } 1209 1210 public: 1211 // initialize to garbage; clear _vdui to disable asserts 1212 DUIterator() 1213 { /*initialize to garbage*/ debug_only(_vdui = false); } 1214 1215 void operator++(int dummy_to_specify_postfix_op) 1216 { _idx++; VDUI_ONLY(verify_increment()); } 1217 1218 void operator--() 1219 { VDUI_ONLY(verify_resync()); --_idx; } 1220 1221 ~DUIterator() 1222 { VDUI_ONLY(verify_finish()); } 1223 1224 void operator=(const DUIterator& that) 1225 { _idx = that._idx; debug_only(reset(that)); } 1226 }; 1227 1228 DUIterator Node::outs() const 1229 { return DUIterator(this, 0); } 1230 DUIterator& Node::refresh_out_pos(DUIterator& i) const 1231 { I_VDUI_ONLY(i, i.refresh()); return i; } 1232 bool Node::has_out(DUIterator& i) const 1233 { I_VDUI_ONLY(i, i.verify(this,true));return i._idx < _outcnt; } 1234 Node* Node::out(DUIterator& i) const 1235 { I_VDUI_ONLY(i, i.verify(this)); return debug_only(i._last=) _out[i._idx]; } 1236 1237 1238 // Faster DU iterator. Disallows insertions into the out array. 1239 // Allows deletion from the out array only at the current point. 1240 // Usage: 1241 // for (DUIterator_Fast imax, i = x->fast_outs(imax); i < imax; i++) { 1242 // Node* y = x->fast_out(i); 1243 // ... 1244 // } 1245 // Compiles in product mode to raw Node** pointer arithmetic, with 1246 // no reloading of pointers from the original node x. If you delete, 1247 // you must perform "--i; --imax" just before continuing the loop. 1248 // If you delete multiple copies of the same edge, you must decrement 1249 // imax, but not i, multiple times: "--i, imax -= num_edges". 1250 class DUIterator_Fast : public DUIterator_Common { 1251 friend class Node; 1252 friend class DUIterator_Last; 1253 1254 // This is the pointer which provides the product-mode behavior. 1255 // Whatever the product-mode version of the system does to the 1256 // DUI pointer is done to this pointer. All other fields in 1257 // this class are used only for assertion checking. 1258 Node** _outp; 1259 1260 #ifdef ASSERT 1261 void verify(const Node* node, bool at_end_ok = false); 1262 void verify_limit(); 1263 void verify_resync(); 1264 void verify_relimit(uint n); 1265 void reset(const DUIterator_Fast& that); 1266 #endif 1267 1268 // Note: offset must be signed, since -1 is sometimes passed 1269 DUIterator_Fast(const Node* node, ptrdiff_t offset) 1270 { _outp = node->_out + offset; debug_only(sample(node)); } 1271 1272 public: 1273 // initialize to garbage; clear _vdui to disable asserts 1274 DUIterator_Fast() 1275 { /*initialize to garbage*/ debug_only(_vdui = false); } 1276 1277 void operator++(int dummy_to_specify_postfix_op) 1278 { _outp++; VDUI_ONLY(verify(_node, true)); } 1279 1280 void operator--() 1281 { VDUI_ONLY(verify_resync()); --_outp; } 1282 1283 void operator-=(uint n) // applied to the limit only 1284 { _outp -= n; VDUI_ONLY(verify_relimit(n)); } 1285 1286 bool operator<(DUIterator_Fast& limit) { 1287 I_VDUI_ONLY(*this, this->verify(_node, true)); 1288 I_VDUI_ONLY(limit, limit.verify_limit()); 1289 return _outp < limit._outp; 1290 } 1291 1292 void operator=(const DUIterator_Fast& that) 1293 { _outp = that._outp; debug_only(reset(that)); } 1294 }; 1295 1296 DUIterator_Fast Node::fast_outs(DUIterator_Fast& imax) const { 1297 // Assign a limit pointer to the reference argument: 1298 imax = DUIterator_Fast(this, (ptrdiff_t)_outcnt); 1299 // Return the base pointer: 1300 return DUIterator_Fast(this, 0); 1301 } 1302 Node* Node::fast_out(DUIterator_Fast& i) const { 1303 I_VDUI_ONLY(i, i.verify(this)); 1304 return debug_only(i._last=) *i._outp; 1305 } 1306 1307 1308 // Faster DU iterator. Requires each successive edge to be removed. 1309 // Does not allow insertion of any edges. 1310 // Usage: 1311 // for (DUIterator_Last imin, i = x->last_outs(imin); i >= imin; i -= num_edges) { 1312 // Node* y = x->last_out(i); 1313 // ... 1314 // } 1315 // Compiles in product mode to raw Node** pointer arithmetic, with 1316 // no reloading of pointers from the original node x. 1317 class DUIterator_Last : private DUIterator_Fast { 1318 friend class Node; 1319 1320 #ifdef ASSERT 1321 void verify(const Node* node, bool at_end_ok = false); 1322 void verify_limit(); 1323 void verify_step(uint num_edges); 1324 #endif 1325 1326 // Note: offset must be signed, since -1 is sometimes passed 1327 DUIterator_Last(const Node* node, ptrdiff_t offset) 1328 : DUIterator_Fast(node, offset) { } 1329 1330 void operator++(int dummy_to_specify_postfix_op) {} // do not use 1331 void operator<(int) {} // do not use 1332 1333 public: 1334 DUIterator_Last() { } 1335 // initialize to garbage 1336 1337 void operator--() 1338 { _outp--; VDUI_ONLY(verify_step(1)); } 1339 1340 void operator-=(uint n) 1341 { _outp -= n; VDUI_ONLY(verify_step(n)); } 1342 1343 bool operator>=(DUIterator_Last& limit) { 1344 I_VDUI_ONLY(*this, this->verify(_node, true)); 1345 I_VDUI_ONLY(limit, limit.verify_limit()); 1346 return _outp >= limit._outp; 1347 } 1348 1349 void operator=(const DUIterator_Last& that) 1350 { DUIterator_Fast::operator=(that); } 1351 }; 1352 1353 DUIterator_Last Node::last_outs(DUIterator_Last& imin) const { 1354 // Assign a limit pointer to the reference argument: 1355 imin = DUIterator_Last(this, 0); 1356 // Return the initial pointer: 1357 return DUIterator_Last(this, (ptrdiff_t)_outcnt - 1); 1358 } 1359 Node* Node::last_out(DUIterator_Last& i) const { 1360 I_VDUI_ONLY(i, i.verify(this)); 1361 return debug_only(i._last=) *i._outp; 1362 } 1363 1364 #endif //OPTO_DU_ITERATOR_ASSERT 1365 1366 #undef I_VDUI_ONLY 1367 #undef VDUI_ONLY 1368 1369 // An Iterator that truly follows the iterator pattern. Doesn't 1370 // support deletion but could be made to. 1371 // 1372 // for (SimpleDUIterator i(n); i.has_next(); i.next()) { 1373 // Node* m = i.get(); 1374 // 1375 class SimpleDUIterator : public StackObj { 1376 private: 1377 Node* node; 1378 DUIterator_Fast i; 1379 DUIterator_Fast imax; 1380 public: 1381 SimpleDUIterator(Node* n): node(n), i(n->fast_outs(imax)) {} 1382 bool has_next() { return i < imax; } 1383 void next() { i++; } 1384 Node* get() { return node->fast_out(i); } 1385 }; 1386 1387 1388 //----------------------------------------------------------------------------- 1389 // Map dense integer indices to Nodes. Uses classic doubling-array trick. 1390 // Abstractly provides an infinite array of Node*'s, initialized to NULL. 1391 // Note that the constructor just zeros things, and since I use Arena 1392 // allocation I do not need a destructor to reclaim storage. 1393 class Node_Array : public ResourceObj { 1394 friend class VMStructs; 1395 protected: 1396 Arena *_a; // Arena to allocate in 1397 uint _max; 1398 Node **_nodes; 1399 void grow( uint i ); // Grow array node to fit 1400 public: 1401 Node_Array(Arena *a) : _a(a), _max(OptoNodeListSize) { 1402 _nodes = NEW_ARENA_ARRAY( a, Node *, OptoNodeListSize ); 1403 for( int i = 0; i < OptoNodeListSize; i++ ) { 1404 _nodes[i] = NULL; 1405 } 1406 } 1407 1408 Node_Array(Node_Array *na) : _a(na->_a), _max(na->_max), _nodes(na->_nodes) {} 1409 Node *operator[] ( uint i ) const // Lookup, or NULL for not mapped 1410 { return (i<_max) ? _nodes[i] : (Node*)NULL; } 1411 Node *at( uint i ) const { assert(i<_max,"oob"); return _nodes[i]; } 1412 Node **adr() { return _nodes; } 1413 // Extend the mapping: index i maps to Node *n. 1414 void map( uint i, Node *n ) { if( i>=_max ) grow(i); _nodes[i] = n; } 1415 void insert( uint i, Node *n ); 1416 void remove( uint i ); // Remove, preserving order 1417 void sort( C_sort_func_t func); 1418 void reset( Arena *new_a ); // Zap mapping to empty; reclaim storage 1419 void clear(); // Set all entries to NULL, keep storage 1420 uint Size() const { return _max; } 1421 void dump() const; 1422 }; 1423 1424 class Node_List : public Node_Array { 1425 friend class VMStructs; 1426 uint _cnt; 1427 public: 1428 Node_List() : Node_Array(Thread::current()->resource_area()), _cnt(0) {} 1429 Node_List(Arena *a) : Node_Array(a), _cnt(0) {} 1430 bool contains(const Node* n) const { 1431 for (uint e = 0; e < size(); e++) { 1432 if (at(e) == n) return true; 1433 } 1434 return false; 1435 } 1436 void insert( uint i, Node *n ) { Node_Array::insert(i,n); _cnt++; } 1437 void remove( uint i ) { Node_Array::remove(i); _cnt--; } 1438 void push( Node *b ) { map(_cnt++,b); } 1439 void yank( Node *n ); // Find and remove 1440 Node *pop() { return _nodes[--_cnt]; } 1441 Node *rpop() { Node *b = _nodes[0]; _nodes[0]=_nodes[--_cnt]; return b;} 1442 void clear() { _cnt = 0; Node_Array::clear(); } // retain storage 1443 uint size() const { return _cnt; } 1444 void dump() const; 1445 void dump_simple() const; 1446 }; 1447 1448 //------------------------------Unique_Node_List------------------------------- 1449 class Unique_Node_List : public Node_List { 1450 friend class VMStructs; 1451 VectorSet _in_worklist; 1452 uint _clock_index; // Index in list where to pop from next 1453 public: 1454 Unique_Node_List() : Node_List(), _in_worklist(Thread::current()->resource_area()), _clock_index(0) {} 1455 Unique_Node_List(Arena *a) : Node_List(a), _in_worklist(a), _clock_index(0) {} 1456 1457 void remove( Node *n ); 1458 bool member( Node *n ) { return _in_worklist.test(n->_idx) != 0; } 1459 VectorSet &member_set(){ return _in_worklist; } 1460 1461 void push( Node *b ) { 1462 if( !_in_worklist.test_set(b->_idx) ) 1463 Node_List::push(b); 1464 } 1465 Node *pop() { 1466 if( _clock_index >= size() ) _clock_index = 0; 1467 Node *b = at(_clock_index); 1468 map( _clock_index, Node_List::pop()); 1469 if (size() != 0) _clock_index++; // Always start from 0 1470 _in_worklist >>= b->_idx; 1471 return b; 1472 } 1473 Node *remove( uint i ) { 1474 Node *b = Node_List::at(i); 1475 _in_worklist >>= b->_idx; 1476 map(i,Node_List::pop()); 1477 return b; 1478 } 1479 void yank( Node *n ) { _in_worklist >>= n->_idx; Node_List::yank(n); } 1480 void clear() { 1481 _in_worklist.Clear(); // Discards storage but grows automatically 1482 Node_List::clear(); 1483 _clock_index = 0; 1484 } 1485 1486 // Used after parsing to remove useless nodes before Iterative GVN 1487 void remove_useless_nodes(VectorSet &useful); 1488 1489 #ifndef PRODUCT 1490 void print_set() const { _in_worklist.print(); } 1491 #endif 1492 }; 1493 1494 // Inline definition of Compile::record_for_igvn must be deferred to this point. 1495 inline void Compile::record_for_igvn(Node* n) { 1496 _for_igvn->push(n); 1497 } 1498 1499 //------------------------------Node_Stack------------------------------------- 1500 class Node_Stack { 1501 friend class VMStructs; 1502 protected: 1503 struct INode { 1504 Node *node; // Processed node 1505 uint indx; // Index of next node's child 1506 }; 1507 INode *_inode_top; // tos, stack grows up 1508 INode *_inode_max; // End of _inodes == _inodes + _max 1509 INode *_inodes; // Array storage for the stack 1510 Arena *_a; // Arena to allocate in 1511 void grow(); 1512 public: 1513 Node_Stack(int size) { 1514 size_t max = (size > OptoNodeListSize) ? size : OptoNodeListSize; 1515 _a = Thread::current()->resource_area(); 1516 _inodes = NEW_ARENA_ARRAY( _a, INode, max ); 1517 _inode_max = _inodes + max; 1518 _inode_top = _inodes - 1; // stack is empty 1519 } 1520 1521 Node_Stack(Arena *a, int size) : _a(a) { 1522 size_t max = (size > OptoNodeListSize) ? size : OptoNodeListSize; 1523 _inodes = NEW_ARENA_ARRAY( _a, INode, max ); 1524 _inode_max = _inodes + max; 1525 _inode_top = _inodes - 1; // stack is empty 1526 } 1527 1528 void pop() { 1529 assert(_inode_top >= _inodes, "node stack underflow"); 1530 --_inode_top; 1531 } 1532 void push(Node *n, uint i) { 1533 ++_inode_top; 1534 if (_inode_top >= _inode_max) grow(); 1535 INode *top = _inode_top; // optimization 1536 top->node = n; 1537 top->indx = i; 1538 } 1539 Node *node() const { 1540 return _inode_top->node; 1541 } 1542 Node* node_at(uint i) const { 1543 assert(_inodes + i <= _inode_top, "in range"); 1544 return _inodes[i].node; 1545 } 1546 uint index() const { 1547 return _inode_top->indx; 1548 } 1549 uint index_at(uint i) const { 1550 assert(_inodes + i <= _inode_top, "in range"); 1551 return _inodes[i].indx; 1552 } 1553 void set_node(Node *n) { 1554 _inode_top->node = n; 1555 } 1556 void set_index(uint i) { 1557 _inode_top->indx = i; 1558 } 1559 uint size_max() const { return (uint)pointer_delta(_inode_max, _inodes, sizeof(INode)); } // Max size 1560 uint size() const { return (uint)pointer_delta((_inode_top+1), _inodes, sizeof(INode)); } // Current size 1561 bool is_nonempty() const { return (_inode_top >= _inodes); } 1562 bool is_empty() const { return (_inode_top < _inodes); } 1563 void clear() { _inode_top = _inodes - 1; } // retain storage 1564 1565 // Node_Stack is used to map nodes. 1566 Node* find(uint idx) const; 1567 }; 1568 1569 1570 //-----------------------------Node_Notes-------------------------------------- 1571 // Debugging or profiling annotations loosely and sparsely associated 1572 // with some nodes. See Compile::node_notes_at for the accessor. 1573 class Node_Notes VALUE_OBJ_CLASS_SPEC { 1574 friend class VMStructs; 1575 JVMState* _jvms; 1576 1577 public: 1578 Node_Notes(JVMState* jvms = NULL) { 1579 _jvms = jvms; 1580 } 1581 1582 JVMState* jvms() { return _jvms; } 1583 void set_jvms(JVMState* x) { _jvms = x; } 1584 1585 // True if there is nothing here. 1586 bool is_clear() { 1587 return (_jvms == NULL); 1588 } 1589 1590 // Make there be nothing here. 1591 void clear() { 1592 _jvms = NULL; 1593 } 1594 1595 // Make a new, clean node notes. 1596 static Node_Notes* make(Compile* C) { 1597 Node_Notes* nn = NEW_ARENA_ARRAY(C->comp_arena(), Node_Notes, 1); 1598 nn->clear(); 1599 return nn; 1600 } 1601 1602 Node_Notes* clone(Compile* C) { 1603 Node_Notes* nn = NEW_ARENA_ARRAY(C->comp_arena(), Node_Notes, 1); 1604 (*nn) = (*this); 1605 return nn; 1606 } 1607 1608 // Absorb any information from source. 1609 bool update_from(Node_Notes* source) { 1610 bool changed = false; 1611 if (source != NULL) { 1612 if (source->jvms() != NULL) { 1613 set_jvms(source->jvms()); 1614 changed = true; 1615 } 1616 } 1617 return changed; 1618 } 1619 }; 1620 1621 // Inlined accessors for Compile::node_nodes that require the preceding class: 1622 inline Node_Notes* 1623 Compile::locate_node_notes(GrowableArray<Node_Notes*>* arr, 1624 int idx, bool can_grow) { 1625 assert(idx >= 0, "oob"); 1626 int block_idx = (idx >> _log2_node_notes_block_size); 1627 int grow_by = (block_idx - (arr == NULL? 0: arr->length())); 1628 if (grow_by >= 0) { 1629 if (!can_grow) return NULL; 1630 grow_node_notes(arr, grow_by + 1); 1631 } 1632 // (Every element of arr is a sub-array of length _node_notes_block_size.) 1633 return arr->at(block_idx) + (idx & (_node_notes_block_size-1)); 1634 } 1635 1636 inline bool 1637 Compile::set_node_notes_at(int idx, Node_Notes* value) { 1638 if (value == NULL || value->is_clear()) 1639 return false; // nothing to write => write nothing 1640 Node_Notes* loc = locate_node_notes(_node_note_array, idx, true); 1641 assert(loc != NULL, ""); 1642 return loc->update_from(value); 1643 } 1644 1645 1646 //------------------------------TypeNode--------------------------------------- 1647 // Node with a Type constant. 1648 class TypeNode : public Node { 1649 protected: 1650 virtual uint hash() const; // Check the type 1651 virtual uint cmp( const Node &n ) const; 1652 virtual uint size_of() const; // Size is bigger 1653 const Type* const _type; 1654 public: 1655 void set_type(const Type* t) { 1656 assert(t != NULL, "sanity"); 1657 debug_only(uint check_hash = (VerifyHashTableKeys && _hash_lock) ? hash() : NO_HASH); 1658 *(const Type**)&_type = t; // cast away const-ness 1659 // If this node is in the hash table, make sure it doesn't need a rehash. 1660 assert(check_hash == NO_HASH || check_hash == hash(), "type change must preserve hash code"); 1661 } 1662 const Type* type() const { assert(_type != NULL, "sanity"); return _type; }; 1663 TypeNode( const Type *t, uint required ) : Node(required), _type(t) { 1664 init_class_id(Class_Type); 1665 } 1666 virtual const Type *Value( PhaseTransform *phase ) const; 1667 virtual const Type *bottom_type() const; 1668 virtual uint ideal_reg() const; 1669 #ifndef PRODUCT 1670 virtual void dump_spec(outputStream *st) const; 1671 virtual void dump_compact_spec(outputStream *st) const; 1672 #endif 1673 }; 1674 1675 #endif // SHARE_VM_OPTO_NODE_HPP