1 /* 2 * Copyright (c) 1997, 2010, 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_MEMNODE_HPP 26 #define SHARE_VM_OPTO_MEMNODE_HPP 27 28 #include "opto/multnode.hpp" 29 #include "opto/node.hpp" 30 #include "opto/opcodes.hpp" 31 #include "opto/type.hpp" 32 33 // Portions of code courtesy of Clifford Click 34 35 class MultiNode; 36 class PhaseCCP; 37 class PhaseTransform; 38 39 //------------------------------MemNode---------------------------------------- 40 // Load or Store, possibly throwing a NULL pointer exception 41 class MemNode : public Node { 42 protected: 43 #ifdef ASSERT 44 const TypePtr* _adr_type; // What kind of memory is being addressed? 45 #endif 46 virtual uint size_of() const; // Size is bigger (ASSERT only) 47 public: 48 enum { Control, // When is it safe to do this load? 49 Memory, // Chunk of memory is being loaded from 50 Address, // Actually address, derived from base 51 ValueIn, // Value to store 52 OopStore // Preceeding oop store, only in StoreCM 53 }; 54 protected: 55 MemNode( Node *c0, Node *c1, Node *c2, const TypePtr* at ) 56 : Node(c0,c1,c2 ) { 57 init_class_id(Class_Mem); 58 debug_only(_adr_type=at; adr_type();) 59 } 60 MemNode( Node *c0, Node *c1, Node *c2, const TypePtr* at, Node *c3 ) 61 : Node(c0,c1,c2,c3) { 62 init_class_id(Class_Mem); 63 debug_only(_adr_type=at; adr_type();) 64 } 65 MemNode( Node *c0, Node *c1, Node *c2, const TypePtr* at, Node *c3, Node *c4) 66 : Node(c0,c1,c2,c3,c4) { 67 init_class_id(Class_Mem); 68 debug_only(_adr_type=at; adr_type();) 69 } 70 71 public: 72 // Helpers for the optimizer. Documented in memnode.cpp. 73 static bool detect_ptr_independence(Node* p1, AllocateNode* a1, 74 Node* p2, AllocateNode* a2, 75 PhaseTransform* phase); 76 static bool adr_phi_is_loop_invariant(Node* adr_phi, Node* cast); 77 78 static Node *optimize_simple_memory_chain(Node *mchain, const TypePtr *t_adr, PhaseGVN *phase); 79 static Node *optimize_memory_chain(Node *mchain, const TypePtr *t_adr, PhaseGVN *phase); 80 // This one should probably be a phase-specific function: 81 static bool all_controls_dominate(Node* dom, Node* sub); 82 83 // Find any cast-away of null-ness and keep its control. 84 static Node *Ideal_common_DU_postCCP( PhaseCCP *ccp, Node* n, Node* adr ); 85 virtual Node *Ideal_DU_postCCP( PhaseCCP *ccp ); 86 87 virtual const class TypePtr *adr_type() const; // returns bottom_type of address 88 89 // Shared code for Ideal methods: 90 Node *Ideal_common(PhaseGVN *phase, bool can_reshape); // Return -1 for short-circuit NULL. 91 92 // Helper function for adr_type() implementations. 93 static const TypePtr* calculate_adr_type(const Type* t, const TypePtr* cross_check = NULL); 94 95 // Raw access function, to allow copying of adr_type efficiently in 96 // product builds and retain the debug info for debug builds. 97 const TypePtr *raw_adr_type() const { 98 #ifdef ASSERT 99 return _adr_type; 100 #else 101 return 0; 102 #endif 103 } 104 105 // Map a load or store opcode to its corresponding store opcode. 106 // (Return -1 if unknown.) 107 virtual int store_Opcode() const { return -1; } 108 109 // What is the type of the value in memory? (T_VOID mean "unspecified".) 110 virtual BasicType memory_type() const = 0; 111 virtual int memory_size() const { 112 #ifdef ASSERT 113 return type2aelembytes(memory_type(), true); 114 #else 115 return type2aelembytes(memory_type()); 116 #endif 117 } 118 119 // Search through memory states which precede this node (load or store). 120 // Look for an exact match for the address, with no intervening 121 // aliased stores. 122 Node* find_previous_store(PhaseTransform* phase); 123 124 // Can this node (load or store) accurately see a stored value in 125 // the given memory state? (The state may or may not be in(Memory).) 126 Node* can_see_stored_value(Node* st, PhaseTransform* phase) const; 127 128 #ifndef PRODUCT 129 static void dump_adr_type(const Node* mem, const TypePtr* adr_type, outputStream *st); 130 virtual void dump_spec(outputStream *st) const; 131 #endif 132 }; 133 134 //------------------------------LoadNode--------------------------------------- 135 // Load value; requires Memory and Address 136 class LoadNode : public MemNode { 137 protected: 138 virtual uint cmp( const Node &n ) const; 139 virtual uint size_of() const; // Size is bigger 140 const Type* const _type; // What kind of value is loaded? 141 public: 142 143 LoadNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const Type *rt ) 144 : MemNode(c,mem,adr,at), _type(rt) { 145 init_class_id(Class_Load); 146 } 147 148 // Polymorphic factory method: 149 static Node* make( PhaseGVN& gvn, Node *c, Node *mem, Node *adr, 150 const TypePtr* at, const Type *rt, BasicType bt ); 151 152 virtual uint hash() const; // Check the type 153 154 // Handle algebraic identities here. If we have an identity, return the Node 155 // we are equivalent to. We look for Load of a Store. 156 virtual Node *Identity( PhaseTransform *phase ); 157 158 // If the load is from Field memory and the pointer is non-null, we can 159 // zero out the control input. 160 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 161 162 // Split instance field load through Phi. 163 Node* split_through_phi(PhaseGVN *phase); 164 165 // Recover original value from boxed values 166 Node *eliminate_autobox(PhaseGVN *phase); 167 168 // Compute a new Type for this node. Basically we just do the pre-check, 169 // then call the virtual add() to set the type. 170 virtual const Type *Value( PhaseTransform *phase ) const; 171 172 // Common methods for LoadKlass and LoadNKlass nodes. 173 const Type *klass_value_common( PhaseTransform *phase ) const; 174 Node *klass_identity_common( PhaseTransform *phase ); 175 176 virtual uint ideal_reg() const; 177 virtual const Type *bottom_type() const; 178 // Following method is copied from TypeNode: 179 void set_type(const Type* t) { 180 assert(t != NULL, "sanity"); 181 debug_only(uint check_hash = (VerifyHashTableKeys && _hash_lock) ? hash() : NO_HASH); 182 *(const Type**)&_type = t; // cast away const-ness 183 // If this node is in the hash table, make sure it doesn't need a rehash. 184 assert(check_hash == NO_HASH || check_hash == hash(), "type change must preserve hash code"); 185 } 186 const Type* type() const { assert(_type != NULL, "sanity"); return _type; }; 187 188 // Do not match memory edge 189 virtual uint match_edge(uint idx) const; 190 191 // Map a load opcode to its corresponding store opcode. 192 virtual int store_Opcode() const = 0; 193 194 // Check if the load's memory input is a Phi node with the same control. 195 bool is_instance_field_load_with_local_phi(Node* ctrl); 196 197 #ifndef PRODUCT 198 virtual void dump_spec(outputStream *st) const; 199 #endif 200 #ifdef ASSERT 201 // Helper function to allow a raw load without control edge for some cases 202 static bool is_immutable_value(Node* adr); 203 #endif 204 protected: 205 const Type* load_array_final_field(const TypeKlassPtr *tkls, 206 ciKlass* klass) const; 207 }; 208 209 //------------------------------LoadBNode-------------------------------------- 210 // Load a byte (8bits signed) from memory 211 class LoadBNode : public LoadNode { 212 public: 213 LoadBNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeInt *ti = TypeInt::BYTE ) 214 : LoadNode(c,mem,adr,at,ti) {} 215 virtual int Opcode() const; 216 virtual uint ideal_reg() const { return Op_RegI; } 217 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 218 virtual int store_Opcode() const { return Op_StoreB; } 219 virtual BasicType memory_type() const { return T_BYTE; } 220 }; 221 222 //------------------------------LoadUBNode------------------------------------- 223 // Load a unsigned byte (8bits unsigned) from memory 224 class LoadUBNode : public LoadNode { 225 public: 226 LoadUBNode(Node* c, Node* mem, Node* adr, const TypePtr* at, const TypeInt* ti = TypeInt::UBYTE ) 227 : LoadNode(c, mem, adr, at, ti) {} 228 virtual int Opcode() const; 229 virtual uint ideal_reg() const { return Op_RegI; } 230 virtual Node* Ideal(PhaseGVN *phase, bool can_reshape); 231 virtual int store_Opcode() const { return Op_StoreB; } 232 virtual BasicType memory_type() const { return T_BYTE; } 233 }; 234 235 //------------------------------LoadUSNode------------------------------------- 236 // Load an unsigned short/char (16bits unsigned) from memory 237 class LoadUSNode : public LoadNode { 238 public: 239 LoadUSNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeInt *ti = TypeInt::CHAR ) 240 : LoadNode(c,mem,adr,at,ti) {} 241 virtual int Opcode() const; 242 virtual uint ideal_reg() const { return Op_RegI; } 243 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 244 virtual int store_Opcode() const { return Op_StoreC; } 245 virtual BasicType memory_type() const { return T_CHAR; } 246 }; 247 248 //------------------------------LoadINode-------------------------------------- 249 // Load an integer from memory 250 class LoadINode : public LoadNode { 251 public: 252 LoadINode( Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeInt *ti = TypeInt::INT ) 253 : LoadNode(c,mem,adr,at,ti) {} 254 virtual int Opcode() const; 255 virtual uint ideal_reg() const { return Op_RegI; } 256 virtual int store_Opcode() const { return Op_StoreI; } 257 virtual BasicType memory_type() const { return T_INT; } 258 }; 259 260 //------------------------------LoadUI2LNode----------------------------------- 261 // Load an unsigned integer into long from memory 262 class LoadUI2LNode : public LoadNode { 263 public: 264 LoadUI2LNode(Node* c, Node* mem, Node* adr, const TypePtr* at, const TypeLong* t = TypeLong::UINT) 265 : LoadNode(c, mem, adr, at, t) {} 266 virtual int Opcode() const; 267 virtual uint ideal_reg() const { return Op_RegL; } 268 virtual int store_Opcode() const { return Op_StoreL; } 269 virtual BasicType memory_type() const { return T_LONG; } 270 }; 271 272 //------------------------------LoadRangeNode---------------------------------- 273 // Load an array length from the array 274 class LoadRangeNode : public LoadINode { 275 public: 276 LoadRangeNode( Node *c, Node *mem, Node *adr, const TypeInt *ti = TypeInt::POS ) 277 : LoadINode(c,mem,adr,TypeAryPtr::RANGE,ti) {} 278 virtual int Opcode() const; 279 virtual const Type *Value( PhaseTransform *phase ) const; 280 virtual Node *Identity( PhaseTransform *phase ); 281 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 282 }; 283 284 //------------------------------LoadLNode-------------------------------------- 285 // Load a long from memory 286 class LoadLNode : public LoadNode { 287 virtual uint hash() const { return LoadNode::hash() + _require_atomic_access; } 288 virtual uint cmp( const Node &n ) const { 289 return _require_atomic_access == ((LoadLNode&)n)._require_atomic_access 290 && LoadNode::cmp(n); 291 } 292 virtual uint size_of() const { return sizeof(*this); } 293 const bool _require_atomic_access; // is piecewise load forbidden? 294 295 public: 296 LoadLNode( Node *c, Node *mem, Node *adr, const TypePtr* at, 297 const TypeLong *tl = TypeLong::LONG, 298 bool require_atomic_access = false ) 299 : LoadNode(c,mem,adr,at,tl) 300 , _require_atomic_access(require_atomic_access) 301 {} 302 virtual int Opcode() const; 303 virtual uint ideal_reg() const { return Op_RegL; } 304 virtual int store_Opcode() const { return Op_StoreL; } 305 virtual BasicType memory_type() const { return T_LONG; } 306 bool require_atomic_access() { return _require_atomic_access; } 307 static LoadLNode* make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, const Type* rt); 308 #ifndef PRODUCT 309 virtual void dump_spec(outputStream *st) const { 310 LoadNode::dump_spec(st); 311 if (_require_atomic_access) st->print(" Atomic!"); 312 } 313 #endif 314 }; 315 316 //------------------------------LoadL_unalignedNode---------------------------- 317 // Load a long from unaligned memory 318 class LoadL_unalignedNode : public LoadLNode { 319 public: 320 LoadL_unalignedNode( Node *c, Node *mem, Node *adr, const TypePtr* at ) 321 : LoadLNode(c,mem,adr,at) {} 322 virtual int Opcode() const; 323 }; 324 325 //------------------------------LoadFNode-------------------------------------- 326 // Load a float (64 bits) from memory 327 class LoadFNode : public LoadNode { 328 public: 329 LoadFNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const Type *t = Type::FLOAT ) 330 : LoadNode(c,mem,adr,at,t) {} 331 virtual int Opcode() const; 332 virtual uint ideal_reg() const { return Op_RegF; } 333 virtual int store_Opcode() const { return Op_StoreF; } 334 virtual BasicType memory_type() const { return T_FLOAT; } 335 }; 336 337 //------------------------------LoadDNode-------------------------------------- 338 // Load a double (64 bits) from memory 339 class LoadDNode : public LoadNode { 340 public: 341 LoadDNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const Type *t = Type::DOUBLE ) 342 : LoadNode(c,mem,adr,at,t) {} 343 virtual int Opcode() const; 344 virtual uint ideal_reg() const { return Op_RegD; } 345 virtual int store_Opcode() const { return Op_StoreD; } 346 virtual BasicType memory_type() const { return T_DOUBLE; } 347 }; 348 349 //------------------------------LoadD_unalignedNode---------------------------- 350 // Load a double from unaligned memory 351 class LoadD_unalignedNode : public LoadDNode { 352 public: 353 LoadD_unalignedNode( Node *c, Node *mem, Node *adr, const TypePtr* at ) 354 : LoadDNode(c,mem,adr,at) {} 355 virtual int Opcode() const; 356 }; 357 358 //------------------------------LoadPNode-------------------------------------- 359 // Load a pointer from memory (either object or array) 360 class LoadPNode : public LoadNode { 361 public: 362 LoadPNode( Node *c, Node *mem, Node *adr, const TypePtr *at, const TypePtr* t ) 363 : LoadNode(c,mem,adr,at,t) {} 364 virtual int Opcode() const; 365 virtual uint ideal_reg() const { return Op_RegP; } 366 virtual int store_Opcode() const { return Op_StoreP; } 367 virtual BasicType memory_type() const { return T_ADDRESS; } 368 // depends_only_on_test is almost always true, and needs to be almost always 369 // true to enable key hoisting & commoning optimizations. However, for the 370 // special case of RawPtr loads from TLS top & end, the control edge carries 371 // the dependence preventing hoisting past a Safepoint instead of the memory 372 // edge. (An unfortunate consequence of having Safepoints not set Raw 373 // Memory; itself an unfortunate consequence of having Nodes which produce 374 // results (new raw memory state) inside of loops preventing all manner of 375 // other optimizations). Basically, it's ugly but so is the alternative. 376 // See comment in macro.cpp, around line 125 expand_allocate_common(). 377 virtual bool depends_only_on_test() const { return adr_type() != TypeRawPtr::BOTTOM; } 378 }; 379 380 381 //------------------------------LoadNNode-------------------------------------- 382 // Load a narrow oop from memory (either object or array) 383 class LoadNNode : public LoadNode { 384 public: 385 LoadNNode( Node *c, Node *mem, Node *adr, const TypePtr *at, const Type* t ) 386 : LoadNode(c,mem,adr,at,t) {} 387 virtual int Opcode() const; 388 virtual uint ideal_reg() const { return Op_RegN; } 389 virtual int store_Opcode() const { return Op_StoreN; } 390 virtual BasicType memory_type() const { return T_NARROWOOP; } 391 // depends_only_on_test is almost always true, and needs to be almost always 392 // true to enable key hoisting & commoning optimizations. However, for the 393 // special case of RawPtr loads from TLS top & end, the control edge carries 394 // the dependence preventing hoisting past a Safepoint instead of the memory 395 // edge. (An unfortunate consequence of having Safepoints not set Raw 396 // Memory; itself an unfortunate consequence of having Nodes which produce 397 // results (new raw memory state) inside of loops preventing all manner of 398 // other optimizations). Basically, it's ugly but so is the alternative. 399 // See comment in macro.cpp, around line 125 expand_allocate_common(). 400 virtual bool depends_only_on_test() const { return adr_type() != TypeRawPtr::BOTTOM; } 401 }; 402 403 //------------------------------LoadKlassNode---------------------------------- 404 // Load a Klass from an object 405 class LoadKlassNode : public LoadPNode { 406 public: 407 LoadKlassNode( Node *c, Node *mem, Node *adr, const TypePtr *at, const TypeKlassPtr *tk ) 408 : LoadPNode(c,mem,adr,at,tk) {} 409 virtual int Opcode() const; 410 virtual const Type *Value( PhaseTransform *phase ) const; 411 virtual Node *Identity( PhaseTransform *phase ); 412 virtual bool depends_only_on_test() const { return true; } 413 414 // Polymorphic factory method: 415 static Node* make( PhaseGVN& gvn, Node *mem, Node *adr, const TypePtr* at, 416 const TypeKlassPtr *tk = TypeKlassPtr::OBJECT ); 417 }; 418 419 //------------------------------LoadNKlassNode--------------------------------- 420 // Load a narrow Klass from an object. 421 class LoadNKlassNode : public LoadNNode { 422 public: 423 LoadNKlassNode( Node *c, Node *mem, Node *adr, const TypePtr *at, const TypeNarrowOop *tk ) 424 : LoadNNode(c,mem,adr,at,tk) {} 425 virtual int Opcode() const; 426 virtual uint ideal_reg() const { return Op_RegN; } 427 virtual int store_Opcode() const { return Op_StoreN; } 428 virtual BasicType memory_type() const { return T_NARROWOOP; } 429 430 virtual const Type *Value( PhaseTransform *phase ) const; 431 virtual Node *Identity( PhaseTransform *phase ); 432 virtual bool depends_only_on_test() const { return true; } 433 }; 434 435 436 //------------------------------LoadSNode-------------------------------------- 437 // Load a short (16bits signed) from memory 438 class LoadSNode : public LoadNode { 439 public: 440 LoadSNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeInt *ti = TypeInt::SHORT ) 441 : LoadNode(c,mem,adr,at,ti) {} 442 virtual int Opcode() const; 443 virtual uint ideal_reg() const { return Op_RegI; } 444 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 445 virtual int store_Opcode() const { return Op_StoreC; } 446 virtual BasicType memory_type() const { return T_SHORT; } 447 }; 448 449 //------------------------------StoreNode-------------------------------------- 450 // Store value; requires Store, Address and Value 451 class StoreNode : public MemNode { 452 protected: 453 virtual uint cmp( const Node &n ) const; 454 virtual bool depends_only_on_test() const { return false; } 455 456 Node *Ideal_masked_input (PhaseGVN *phase, uint mask); 457 Node *Ideal_sign_extended_input(PhaseGVN *phase, int num_bits); 458 459 public: 460 StoreNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) 461 : MemNode(c,mem,adr,at,val) { 462 init_class_id(Class_Store); 463 } 464 StoreNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, Node *oop_store ) 465 : MemNode(c,mem,adr,at,val,oop_store) { 466 init_class_id(Class_Store); 467 } 468 469 // Polymorphic factory method: 470 static StoreNode* make( PhaseGVN& gvn, Node *c, Node *mem, Node *adr, 471 const TypePtr* at, Node *val, BasicType bt ); 472 473 virtual uint hash() const; // Check the type 474 475 // If the store is to Field memory and the pointer is non-null, we can 476 // zero out the control input. 477 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 478 479 // Compute a new Type for this node. Basically we just do the pre-check, 480 // then call the virtual add() to set the type. 481 virtual const Type *Value( PhaseTransform *phase ) const; 482 483 // Check for identity function on memory (Load then Store at same address) 484 virtual Node *Identity( PhaseTransform *phase ); 485 486 // Do not match memory edge 487 virtual uint match_edge(uint idx) const; 488 489 virtual const Type *bottom_type() const; // returns Type::MEMORY 490 491 // Map a store opcode to its corresponding own opcode, trivially. 492 virtual int store_Opcode() const { return Opcode(); } 493 494 // have all possible loads of the value stored been optimized away? 495 bool value_never_loaded(PhaseTransform *phase) const; 496 }; 497 498 //------------------------------StoreBNode------------------------------------- 499 // Store byte to memory 500 class StoreBNode : public StoreNode { 501 public: 502 StoreBNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} 503 virtual int Opcode() const; 504 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 505 virtual BasicType memory_type() const { return T_BYTE; } 506 }; 507 508 //------------------------------StoreCNode------------------------------------- 509 // Store char/short to memory 510 class StoreCNode : public StoreNode { 511 public: 512 StoreCNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} 513 virtual int Opcode() const; 514 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 515 virtual BasicType memory_type() const { return T_CHAR; } 516 }; 517 518 //------------------------------StoreINode------------------------------------- 519 // Store int to memory 520 class StoreINode : public StoreNode { 521 public: 522 StoreINode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} 523 virtual int Opcode() const; 524 virtual BasicType memory_type() const { return T_INT; } 525 }; 526 527 //------------------------------StoreLNode------------------------------------- 528 // Store long to memory 529 class StoreLNode : public StoreNode { 530 virtual uint hash() const { return StoreNode::hash() + _require_atomic_access; } 531 virtual uint cmp( const Node &n ) const { 532 return _require_atomic_access == ((StoreLNode&)n)._require_atomic_access 533 && StoreNode::cmp(n); 534 } 535 virtual uint size_of() const { return sizeof(*this); } 536 const bool _require_atomic_access; // is piecewise store forbidden? 537 538 public: 539 StoreLNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, 540 bool require_atomic_access = false ) 541 : StoreNode(c,mem,adr,at,val) 542 , _require_atomic_access(require_atomic_access) 543 {} 544 virtual int Opcode() const; 545 virtual BasicType memory_type() const { return T_LONG; } 546 bool require_atomic_access() { return _require_atomic_access; } 547 static StoreLNode* make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val); 548 #ifndef PRODUCT 549 virtual void dump_spec(outputStream *st) const { 550 StoreNode::dump_spec(st); 551 if (_require_atomic_access) st->print(" Atomic!"); 552 } 553 #endif 554 }; 555 556 //------------------------------StoreFNode------------------------------------- 557 // Store float to memory 558 class StoreFNode : public StoreNode { 559 public: 560 StoreFNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} 561 virtual int Opcode() const; 562 virtual BasicType memory_type() const { return T_FLOAT; } 563 }; 564 565 //------------------------------StoreDNode------------------------------------- 566 // Store double to memory 567 class StoreDNode : public StoreNode { 568 public: 569 StoreDNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} 570 virtual int Opcode() const; 571 virtual BasicType memory_type() const { return T_DOUBLE; } 572 }; 573 574 //------------------------------StorePNode------------------------------------- 575 // Store pointer to memory 576 class StorePNode : public StoreNode { 577 public: 578 StorePNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} 579 virtual int Opcode() const; 580 virtual BasicType memory_type() const { return T_ADDRESS; } 581 }; 582 583 //------------------------------StoreNNode------------------------------------- 584 // Store narrow oop to memory 585 class StoreNNode : public StoreNode { 586 public: 587 StoreNNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} 588 virtual int Opcode() const; 589 virtual BasicType memory_type() const { return T_NARROWOOP; } 590 }; 591 592 //------------------------------StoreCMNode----------------------------------- 593 // Store card-mark byte to memory for CM 594 // The last StoreCM before a SafePoint must be preserved and occur after its "oop" store 595 // Preceeding equivalent StoreCMs may be eliminated. 596 class StoreCMNode : public StoreNode { 597 private: 598 virtual uint hash() const { return StoreNode::hash() + _oop_alias_idx; } 599 virtual uint cmp( const Node &n ) const { 600 return _oop_alias_idx == ((StoreCMNode&)n)._oop_alias_idx 601 && StoreNode::cmp(n); 602 } 603 virtual uint size_of() const { return sizeof(*this); } 604 int _oop_alias_idx; // The alias_idx of OopStore 605 606 public: 607 StoreCMNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, Node *oop_store, int oop_alias_idx ) : 608 StoreNode(c,mem,adr,at,val,oop_store), 609 _oop_alias_idx(oop_alias_idx) { 610 assert(_oop_alias_idx >= Compile::AliasIdxRaw || 611 _oop_alias_idx == Compile::AliasIdxBot && Compile::current()->AliasLevel() == 0, 612 "bad oop alias idx"); 613 } 614 virtual int Opcode() const; 615 virtual Node *Identity( PhaseTransform *phase ); 616 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 617 virtual const Type *Value( PhaseTransform *phase ) const; 618 virtual BasicType memory_type() const { return T_VOID; } // unspecific 619 int oop_alias_idx() const { return _oop_alias_idx; } 620 }; 621 622 //------------------------------LoadPLockedNode--------------------------------- 623 // Load-locked a pointer from memory (either object or array). 624 // On Sparc & Intel this is implemented as a normal pointer load. 625 // On PowerPC and friends it's a real load-locked. 626 class LoadPLockedNode : public LoadPNode { 627 public: 628 LoadPLockedNode( Node *c, Node *mem, Node *adr ) 629 : LoadPNode(c,mem,adr,TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM) {} 630 virtual int Opcode() const; 631 virtual int store_Opcode() const { return Op_StorePConditional; } 632 virtual bool depends_only_on_test() const { return true; } 633 }; 634 635 //------------------------------LoadLLockedNode--------------------------------- 636 // Load-locked a pointer from memory (either object or array). 637 // On Sparc & Intel this is implemented as a normal long load. 638 class LoadLLockedNode : public LoadLNode { 639 public: 640 LoadLLockedNode( Node *c, Node *mem, Node *adr ) 641 : LoadLNode(c,mem,adr,TypeRawPtr::BOTTOM, TypeLong::LONG) {} 642 virtual int Opcode() const; 643 virtual int store_Opcode() const { return Op_StoreLConditional; } 644 }; 645 646 //------------------------------SCMemProjNode--------------------------------------- 647 // This class defines a projection of the memory state of a store conditional node. 648 // These nodes return a value, but also update memory. 649 class SCMemProjNode : public ProjNode { 650 public: 651 enum {SCMEMPROJCON = (uint)-2}; 652 SCMemProjNode( Node *src) : ProjNode( src, SCMEMPROJCON) { } 653 virtual int Opcode() const; 654 virtual bool is_CFG() const { return false; } 655 virtual const Type *bottom_type() const {return Type::MEMORY;} 656 virtual const TypePtr *adr_type() const { return in(0)->in(MemNode::Memory)->adr_type();} 657 virtual uint ideal_reg() const { return 0;} // memory projections don't have a register 658 virtual const Type *Value( PhaseTransform *phase ) const; 659 #ifndef PRODUCT 660 virtual void dump_spec(outputStream *st) const {}; 661 #endif 662 }; 663 664 //------------------------------LoadStoreNode--------------------------- 665 // Note: is_Mem() method returns 'true' for this class. 666 class LoadStoreNode : public Node { 667 public: 668 enum { 669 ExpectedIn = MemNode::ValueIn+1 // One more input than MemNode 670 }; 671 LoadStoreNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex); 672 virtual bool depends_only_on_test() const { return false; } 673 virtual const Type *bottom_type() const { return TypeInt::BOOL; } 674 virtual uint ideal_reg() const { return Op_RegI; } 675 virtual uint match_edge(uint idx) const { return idx == MemNode::Address || idx == MemNode::ValueIn; } 676 }; 677 678 //------------------------------StorePConditionalNode--------------------------- 679 // Conditionally store pointer to memory, if no change since prior 680 // load-locked. Sets flags for success or failure of the store. 681 class StorePConditionalNode : public LoadStoreNode { 682 public: 683 StorePConditionalNode( Node *c, Node *mem, Node *adr, Node *val, Node *ll ) : LoadStoreNode(c, mem, adr, val, ll) { } 684 virtual int Opcode() const; 685 // Produces flags 686 virtual uint ideal_reg() const { return Op_RegFlags; } 687 }; 688 689 //------------------------------StoreIConditionalNode--------------------------- 690 // Conditionally store int to memory, if no change since prior 691 // load-locked. Sets flags for success or failure of the store. 692 class StoreIConditionalNode : public LoadStoreNode { 693 public: 694 StoreIConditionalNode( Node *c, Node *mem, Node *adr, Node *val, Node *ii ) : LoadStoreNode(c, mem, adr, val, ii) { } 695 virtual int Opcode() const; 696 // Produces flags 697 virtual uint ideal_reg() const { return Op_RegFlags; } 698 }; 699 700 //------------------------------StoreLConditionalNode--------------------------- 701 // Conditionally store long to memory, if no change since prior 702 // load-locked. Sets flags for success or failure of the store. 703 class StoreLConditionalNode : public LoadStoreNode { 704 public: 705 StoreLConditionalNode( Node *c, Node *mem, Node *adr, Node *val, Node *ll ) : LoadStoreNode(c, mem, adr, val, ll) { } 706 virtual int Opcode() const; 707 // Produces flags 708 virtual uint ideal_reg() const { return Op_RegFlags; } 709 }; 710 711 712 //------------------------------CompareAndSwapLNode--------------------------- 713 class CompareAndSwapLNode : public LoadStoreNode { 714 public: 715 CompareAndSwapLNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } 716 virtual int Opcode() const; 717 }; 718 719 720 //------------------------------CompareAndSwapINode--------------------------- 721 class CompareAndSwapINode : public LoadStoreNode { 722 public: 723 CompareAndSwapINode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } 724 virtual int Opcode() const; 725 }; 726 727 728 //------------------------------CompareAndSwapPNode--------------------------- 729 class CompareAndSwapPNode : public LoadStoreNode { 730 public: 731 CompareAndSwapPNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } 732 virtual int Opcode() const; 733 }; 734 735 //------------------------------CompareAndSwapNNode--------------------------- 736 class CompareAndSwapNNode : public LoadStoreNode { 737 public: 738 CompareAndSwapNNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } 739 virtual int Opcode() const; 740 }; 741 742 //------------------------------ClearArray------------------------------------- 743 class ClearArrayNode: public Node { 744 public: 745 ClearArrayNode( Node *ctrl, Node *arymem, Node *word_cnt, Node *base ) 746 : Node(ctrl,arymem,word_cnt,base) { 747 init_class_id(Class_ClearArray); 748 } 749 virtual int Opcode() const; 750 virtual const Type *bottom_type() const { return Type::MEMORY; } 751 // ClearArray modifies array elements, and so affects only the 752 // array memory addressed by the bottom_type of its base address. 753 virtual const class TypePtr *adr_type() const; 754 virtual Node *Identity( PhaseTransform *phase ); 755 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 756 virtual uint match_edge(uint idx) const; 757 758 // Clear the given area of an object or array. 759 // The start offset must always be aligned mod BytesPerInt. 760 // The end offset must always be aligned mod BytesPerLong. 761 // Return the new memory. 762 static Node* clear_memory(Node* control, Node* mem, Node* dest, 763 intptr_t start_offset, 764 intptr_t end_offset, 765 PhaseGVN* phase); 766 static Node* clear_memory(Node* control, Node* mem, Node* dest, 767 intptr_t start_offset, 768 Node* end_offset, 769 PhaseGVN* phase); 770 static Node* clear_memory(Node* control, Node* mem, Node* dest, 771 Node* start_offset, 772 Node* end_offset, 773 PhaseGVN* phase); 774 // Return allocation input memory edge if it is different instance 775 // or itself if it is the one we are looking for. 776 static bool step_through(Node** np, uint instance_id, PhaseTransform* phase); 777 }; 778 779 //------------------------------StrComp------------------------------------- 780 class StrCompNode: public Node { 781 public: 782 StrCompNode(Node* control, Node* char_array_mem, 783 Node* s1, Node* c1, 784 Node* s2, Node* c2): Node(control, char_array_mem, 785 s1, c1, 786 s2, c2) {}; 787 virtual int Opcode() const; 788 virtual bool depends_only_on_test() const { return false; } 789 virtual const Type* bottom_type() const { return TypeInt::INT; } 790 virtual const TypePtr* adr_type() const { return TypeAryPtr::CHARS; } 791 virtual uint match_edge(uint idx) const; 792 virtual uint ideal_reg() const { return Op_RegI; } 793 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 794 }; 795 796 //------------------------------StrEquals------------------------------------- 797 class StrEqualsNode: public Node { 798 public: 799 StrEqualsNode(Node* control, Node* char_array_mem, 800 Node* s1, Node* s2, Node* c): Node(control, char_array_mem, 801 s1, s2, c) {}; 802 virtual int Opcode() const; 803 virtual bool depends_only_on_test() const { return false; } 804 virtual const Type* bottom_type() const { return TypeInt::BOOL; } 805 virtual const TypePtr* adr_type() const { return TypeAryPtr::CHARS; } 806 virtual uint match_edge(uint idx) const; 807 virtual uint ideal_reg() const { return Op_RegI; } 808 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 809 }; 810 811 //------------------------------StrIndexOf------------------------------------- 812 class StrIndexOfNode: public Node { 813 public: 814 StrIndexOfNode(Node* control, Node* char_array_mem, 815 Node* s1, Node* c1, 816 Node* s2, Node* c2): Node(control, char_array_mem, 817 s1, c1, 818 s2, c2) {}; 819 virtual int Opcode() const; 820 virtual bool depends_only_on_test() const { return false; } 821 virtual const Type* bottom_type() const { return TypeInt::INT; } 822 virtual const TypePtr* adr_type() const { return TypeAryPtr::CHARS; } 823 virtual uint match_edge(uint idx) const; 824 virtual uint ideal_reg() const { return Op_RegI; } 825 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 826 }; 827 828 //------------------------------AryEq--------------------------------------- 829 class AryEqNode: public Node { 830 public: 831 AryEqNode(Node* control, Node* char_array_mem, 832 Node* s1, Node* s2): Node(control, char_array_mem, s1, s2) {}; 833 virtual int Opcode() const; 834 virtual bool depends_only_on_test() const { return false; } 835 virtual const Type* bottom_type() const { return TypeInt::BOOL; } 836 virtual const TypePtr* adr_type() const { return TypeAryPtr::CHARS; } 837 virtual uint match_edge(uint idx) const; 838 virtual uint ideal_reg() const { return Op_RegI; } 839 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 840 }; 841 842 //------------------------------MemBar----------------------------------------- 843 // There are different flavors of Memory Barriers to match the Java Memory 844 // Model. Monitor-enter and volatile-load act as Aquires: no following ref 845 // can be moved to before them. We insert a MemBar-Acquire after a FastLock or 846 // volatile-load. Monitor-exit and volatile-store act as Release: no 847 // preceding ref can be moved to after them. We insert a MemBar-Release 848 // before a FastUnlock or volatile-store. All volatiles need to be 849 // serialized, so we follow all volatile-stores with a MemBar-Volatile to 850 // separate it from any following volatile-load. 851 class MemBarNode: public MultiNode { 852 virtual uint hash() const ; // { return NO_HASH; } 853 virtual uint cmp( const Node &n ) const ; // Always fail, except on self 854 855 virtual uint size_of() const { return sizeof(*this); } 856 // Memory type this node is serializing. Usually either rawptr or bottom. 857 const TypePtr* _adr_type; 858 859 public: 860 enum { 861 Precedent = TypeFunc::Parms // optional edge to force precedence 862 }; 863 MemBarNode(Compile* C, int alias_idx, Node* precedent); 864 virtual int Opcode() const = 0; 865 virtual const class TypePtr *adr_type() const { return _adr_type; } 866 virtual const Type *Value( PhaseTransform *phase ) const; 867 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 868 virtual uint match_edge(uint idx) const { return 0; } 869 virtual const Type *bottom_type() const { return TypeTuple::MEMBAR; } 870 virtual Node *match( const ProjNode *proj, const Matcher *m ); 871 // Factory method. Builds a wide or narrow membar. 872 // Optional 'precedent' becomes an extra edge if not null. 873 static MemBarNode* make(Compile* C, int opcode, 874 int alias_idx = Compile::AliasIdxBot, 875 Node* precedent = NULL); 876 }; 877 878 // "Acquire" - no following ref can move before (but earlier refs can 879 // follow, like an early Load stalled in cache). Requires multi-cpu 880 // visibility. Inserted after a volatile load or FastLock. 881 class MemBarAcquireNode: public MemBarNode { 882 public: 883 MemBarAcquireNode(Compile* C, int alias_idx, Node* precedent) 884 : MemBarNode(C, alias_idx, precedent) {} 885 virtual int Opcode() const; 886 }; 887 888 // "Release" - no earlier ref can move after (but later refs can move 889 // up, like a speculative pipelined cache-hitting Load). Requires 890 // multi-cpu visibility. Inserted before a volatile store or FastUnLock. 891 class MemBarReleaseNode: public MemBarNode { 892 public: 893 MemBarReleaseNode(Compile* C, int alias_idx, Node* precedent) 894 : MemBarNode(C, alias_idx, precedent) {} 895 virtual int Opcode() const; 896 }; 897 898 // Ordering between a volatile store and a following volatile load. 899 // Requires multi-CPU visibility? 900 class MemBarVolatileNode: public MemBarNode { 901 public: 902 MemBarVolatileNode(Compile* C, int alias_idx, Node* precedent) 903 : MemBarNode(C, alias_idx, precedent) {} 904 virtual int Opcode() const; 905 }; 906 907 // Ordering within the same CPU. Used to order unsafe memory references 908 // inside the compiler when we lack alias info. Not needed "outside" the 909 // compiler because the CPU does all the ordering for us. 910 class MemBarCPUOrderNode: public MemBarNode { 911 public: 912 MemBarCPUOrderNode(Compile* C, int alias_idx, Node* precedent) 913 : MemBarNode(C, alias_idx, precedent) {} 914 virtual int Opcode() const; 915 virtual uint ideal_reg() const { return 0; } // not matched in the AD file 916 }; 917 918 // Isolation of object setup after an AllocateNode and before next safepoint. 919 // (See comment in memnode.cpp near InitializeNode::InitializeNode for semantics.) 920 class InitializeNode: public MemBarNode { 921 friend class AllocateNode; 922 923 bool _is_complete; 924 925 public: 926 enum { 927 Control = TypeFunc::Control, 928 Memory = TypeFunc::Memory, // MergeMem for states affected by this op 929 RawAddress = TypeFunc::Parms+0, // the newly-allocated raw address 930 RawStores = TypeFunc::Parms+1 // zero or more stores (or TOP) 931 }; 932 933 InitializeNode(Compile* C, int adr_type, Node* rawoop); 934 virtual int Opcode() const; 935 virtual uint size_of() const { return sizeof(*this); } 936 virtual uint ideal_reg() const { return 0; } // not matched in the AD file 937 virtual const RegMask &in_RegMask(uint) const; // mask for RawAddress 938 939 // Manage incoming memory edges via a MergeMem on in(Memory): 940 Node* memory(uint alias_idx); 941 942 // The raw memory edge coming directly from the Allocation. 943 // The contents of this memory are *always* all-zero-bits. 944 Node* zero_memory() { return memory(Compile::AliasIdxRaw); } 945 946 // Return the corresponding allocation for this initialization (or null if none). 947 // (Note: Both InitializeNode::allocation and AllocateNode::initialization 948 // are defined in graphKit.cpp, which sets up the bidirectional relation.) 949 AllocateNode* allocation(); 950 951 // Anything other than zeroing in this init? 952 bool is_non_zero(); 953 954 // An InitializeNode must completed before macro expansion is done. 955 // Completion requires that the AllocateNode must be followed by 956 // initialization of the new memory to zero, then to any initializers. 957 bool is_complete() { return _is_complete; } 958 959 // Mark complete. (Must not yet be complete.) 960 void set_complete(PhaseGVN* phase); 961 962 #ifdef ASSERT 963 // ensure all non-degenerate stores are ordered and non-overlapping 964 bool stores_are_sane(PhaseTransform* phase); 965 #endif //ASSERT 966 967 // See if this store can be captured; return offset where it initializes. 968 // Return 0 if the store cannot be moved (any sort of problem). 969 intptr_t can_capture_store(StoreNode* st, PhaseTransform* phase); 970 971 // Capture another store; reformat it to write my internal raw memory. 972 // Return the captured copy, else NULL if there is some sort of problem. 973 Node* capture_store(StoreNode* st, intptr_t start, PhaseTransform* phase); 974 975 // Find captured store which corresponds to the range [start..start+size). 976 // Return my own memory projection (meaning the initial zero bits) 977 // if there is no such store. Return NULL if there is a problem. 978 Node* find_captured_store(intptr_t start, int size_in_bytes, PhaseTransform* phase); 979 980 // Called when the associated AllocateNode is expanded into CFG. 981 Node* complete_stores(Node* rawctl, Node* rawmem, Node* rawptr, 982 intptr_t header_size, Node* size_in_bytes, 983 PhaseGVN* phase); 984 985 private: 986 void remove_extra_zeroes(); 987 988 // Find out where a captured store should be placed (or already is placed). 989 int captured_store_insertion_point(intptr_t start, int size_in_bytes, 990 PhaseTransform* phase); 991 992 static intptr_t get_store_offset(Node* st, PhaseTransform* phase); 993 994 Node* make_raw_address(intptr_t offset, PhaseTransform* phase); 995 996 bool detect_init_independence(Node* n, bool st_is_pinned, int& count); 997 998 void coalesce_subword_stores(intptr_t header_size, Node* size_in_bytes, 999 PhaseGVN* phase); 1000 1001 intptr_t find_next_fullword_store(uint i, PhaseGVN* phase); 1002 }; 1003 1004 //------------------------------MergeMem--------------------------------------- 1005 // (See comment in memnode.cpp near MergeMemNode::MergeMemNode for semantics.) 1006 class MergeMemNode: public Node { 1007 virtual uint hash() const ; // { return NO_HASH; } 1008 virtual uint cmp( const Node &n ) const ; // Always fail, except on self 1009 friend class MergeMemStream; 1010 MergeMemNode(Node* def); // clients use MergeMemNode::make 1011 1012 public: 1013 // If the input is a whole memory state, clone it with all its slices intact. 1014 // Otherwise, make a new memory state with just that base memory input. 1015 // In either case, the result is a newly created MergeMem. 1016 static MergeMemNode* make(Compile* C, Node* base_memory); 1017 1018 virtual int Opcode() const; 1019 virtual Node *Identity( PhaseTransform *phase ); 1020 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 1021 virtual uint ideal_reg() const { return NotAMachineReg; } 1022 virtual uint match_edge(uint idx) const { return 0; } 1023 virtual const RegMask &out_RegMask() const; 1024 virtual const Type *bottom_type() const { return Type::MEMORY; } 1025 virtual const TypePtr *adr_type() const { return TypePtr::BOTTOM; } 1026 // sparse accessors 1027 // Fetch the previously stored "set_memory_at", or else the base memory. 1028 // (Caller should clone it if it is a phi-nest.) 1029 Node* memory_at(uint alias_idx) const; 1030 // set the memory, regardless of its previous value 1031 void set_memory_at(uint alias_idx, Node* n); 1032 // the "base" is the memory that provides the non-finite support 1033 Node* base_memory() const { return in(Compile::AliasIdxBot); } 1034 // warning: setting the base can implicitly set any of the other slices too 1035 void set_base_memory(Node* def); 1036 // sentinel value which denotes a copy of the base memory: 1037 Node* empty_memory() const { return in(Compile::AliasIdxTop); } 1038 static Node* make_empty_memory(); // where the sentinel comes from 1039 bool is_empty_memory(Node* n) const { assert((n == empty_memory()) == n->is_top(), "sanity"); return n->is_top(); } 1040 // hook for the iterator, to perform any necessary setup 1041 void iteration_setup(const MergeMemNode* other = NULL); 1042 // push sentinels until I am at least as long as the other (semantic no-op) 1043 void grow_to_match(const MergeMemNode* other); 1044 bool verify_sparse() const PRODUCT_RETURN0; 1045 #ifndef PRODUCT 1046 virtual void dump_spec(outputStream *st) const; 1047 #endif 1048 }; 1049 1050 class MergeMemStream : public StackObj { 1051 private: 1052 MergeMemNode* _mm; 1053 const MergeMemNode* _mm2; // optional second guy, contributes non-empty iterations 1054 Node* _mm_base; // loop-invariant base memory of _mm 1055 int _idx; 1056 int _cnt; 1057 Node* _mem; 1058 Node* _mem2; 1059 int _cnt2; 1060 1061 void init(MergeMemNode* mm, const MergeMemNode* mm2 = NULL) { 1062 // subsume_node will break sparseness at times, whenever a memory slice 1063 // folds down to a copy of the base ("fat") memory. In such a case, 1064 // the raw edge will update to base, although it should be top. 1065 // This iterator will recognize either top or base_memory as an 1066 // "empty" slice. See is_empty, is_empty2, and next below. 1067 // 1068 // The sparseness property is repaired in MergeMemNode::Ideal. 1069 // As long as access to a MergeMem goes through this iterator 1070 // or the memory_at accessor, flaws in the sparseness will 1071 // never be observed. 1072 // 1073 // Also, iteration_setup repairs sparseness. 1074 assert(mm->verify_sparse(), "please, no dups of base"); 1075 assert(mm2==NULL || mm2->verify_sparse(), "please, no dups of base"); 1076 1077 _mm = mm; 1078 _mm_base = mm->base_memory(); 1079 _mm2 = mm2; 1080 _cnt = mm->req(); 1081 _idx = Compile::AliasIdxBot-1; // start at the base memory 1082 _mem = NULL; 1083 _mem2 = NULL; 1084 } 1085 1086 #ifdef ASSERT 1087 Node* check_memory() const { 1088 if (at_base_memory()) 1089 return _mm->base_memory(); 1090 else if ((uint)_idx < _mm->req() && !_mm->in(_idx)->is_top()) 1091 return _mm->memory_at(_idx); 1092 else 1093 return _mm_base; 1094 } 1095 Node* check_memory2() const { 1096 return at_base_memory()? _mm2->base_memory(): _mm2->memory_at(_idx); 1097 } 1098 #endif 1099 1100 static bool match_memory(Node* mem, const MergeMemNode* mm, int idx) PRODUCT_RETURN0; 1101 void assert_synch() const { 1102 assert(!_mem || _idx >= _cnt || match_memory(_mem, _mm, _idx), 1103 "no side-effects except through the stream"); 1104 } 1105 1106 public: 1107 1108 // expected usages: 1109 // for (MergeMemStream mms(mem->is_MergeMem()); next_non_empty(); ) { ... } 1110 // for (MergeMemStream mms(mem1, mem2); next_non_empty2(); ) { ... } 1111 1112 // iterate over one merge 1113 MergeMemStream(MergeMemNode* mm) { 1114 mm->iteration_setup(); 1115 init(mm); 1116 debug_only(_cnt2 = 999); 1117 } 1118 // iterate in parallel over two merges 1119 // only iterates through non-empty elements of mm2 1120 MergeMemStream(MergeMemNode* mm, const MergeMemNode* mm2) { 1121 assert(mm2, "second argument must be a MergeMem also"); 1122 ((MergeMemNode*)mm2)->iteration_setup(); // update hidden state 1123 mm->iteration_setup(mm2); 1124 init(mm, mm2); 1125 _cnt2 = mm2->req(); 1126 } 1127 #ifdef ASSERT 1128 ~MergeMemStream() { 1129 assert_synch(); 1130 } 1131 #endif 1132 1133 MergeMemNode* all_memory() const { 1134 return _mm; 1135 } 1136 Node* base_memory() const { 1137 assert(_mm_base == _mm->base_memory(), "no update to base memory, please"); 1138 return _mm_base; 1139 } 1140 const MergeMemNode* all_memory2() const { 1141 assert(_mm2 != NULL, ""); 1142 return _mm2; 1143 } 1144 bool at_base_memory() const { 1145 return _idx == Compile::AliasIdxBot; 1146 } 1147 int alias_idx() const { 1148 assert(_mem, "must call next 1st"); 1149 return _idx; 1150 } 1151 1152 const TypePtr* adr_type() const { 1153 return Compile::current()->get_adr_type(alias_idx()); 1154 } 1155 1156 const TypePtr* adr_type(Compile* C) const { 1157 return C->get_adr_type(alias_idx()); 1158 } 1159 bool is_empty() const { 1160 assert(_mem, "must call next 1st"); 1161 assert(_mem->is_top() == (_mem==_mm->empty_memory()), "correct sentinel"); 1162 return _mem->is_top(); 1163 } 1164 bool is_empty2() const { 1165 assert(_mem2, "must call next 1st"); 1166 assert(_mem2->is_top() == (_mem2==_mm2->empty_memory()), "correct sentinel"); 1167 return _mem2->is_top(); 1168 } 1169 Node* memory() const { 1170 assert(!is_empty(), "must not be empty"); 1171 assert_synch(); 1172 return _mem; 1173 } 1174 // get the current memory, regardless of empty or non-empty status 1175 Node* force_memory() const { 1176 assert(!is_empty() || !at_base_memory(), ""); 1177 // Use _mm_base to defend against updates to _mem->base_memory(). 1178 Node *mem = _mem->is_top() ? _mm_base : _mem; 1179 assert(mem == check_memory(), ""); 1180 return mem; 1181 } 1182 Node* memory2() const { 1183 assert(_mem2 == check_memory2(), ""); 1184 return _mem2; 1185 } 1186 void set_memory(Node* mem) { 1187 if (at_base_memory()) { 1188 // Note that this does not change the invariant _mm_base. 1189 _mm->set_base_memory(mem); 1190 } else { 1191 _mm->set_memory_at(_idx, mem); 1192 } 1193 _mem = mem; 1194 assert_synch(); 1195 } 1196 1197 // Recover from a side effect to the MergeMemNode. 1198 void set_memory() { 1199 _mem = _mm->in(_idx); 1200 } 1201 1202 bool next() { return next(false); } 1203 bool next2() { return next(true); } 1204 1205 bool next_non_empty() { return next_non_empty(false); } 1206 bool next_non_empty2() { return next_non_empty(true); } 1207 // next_non_empty2 can yield states where is_empty() is true 1208 1209 private: 1210 // find the next item, which might be empty 1211 bool next(bool have_mm2) { 1212 assert((_mm2 != NULL) == have_mm2, "use other next"); 1213 assert_synch(); 1214 if (++_idx < _cnt) { 1215 // Note: This iterator allows _mm to be non-sparse. 1216 // It behaves the same whether _mem is top or base_memory. 1217 _mem = _mm->in(_idx); 1218 if (have_mm2) 1219 _mem2 = _mm2->in((_idx < _cnt2) ? _idx : Compile::AliasIdxTop); 1220 return true; 1221 } 1222 return false; 1223 } 1224 1225 // find the next non-empty item 1226 bool next_non_empty(bool have_mm2) { 1227 while (next(have_mm2)) { 1228 if (!is_empty()) { 1229 // make sure _mem2 is filled in sensibly 1230 if (have_mm2 && _mem2->is_top()) _mem2 = _mm2->base_memory(); 1231 return true; 1232 } else if (have_mm2 && !is_empty2()) { 1233 return true; // is_empty() == true 1234 } 1235 } 1236 return false; 1237 } 1238 }; 1239 1240 //------------------------------Prefetch--------------------------------------- 1241 1242 // Non-faulting prefetch load. Prefetch for many reads. 1243 class PrefetchReadNode : public Node { 1244 public: 1245 PrefetchReadNode(Node *abio, Node *adr) : Node(0,abio,adr) {} 1246 virtual int Opcode() const; 1247 virtual uint ideal_reg() const { return NotAMachineReg; } 1248 virtual uint match_edge(uint idx) const { return idx==2; } 1249 virtual const Type *bottom_type() const { return Type::ABIO; } 1250 }; 1251 1252 // Non-faulting prefetch load. Prefetch for many reads & many writes. 1253 class PrefetchWriteNode : public Node { 1254 public: 1255 PrefetchWriteNode(Node *abio, Node *adr) : Node(0,abio,adr) {} 1256 virtual int Opcode() const; 1257 virtual uint ideal_reg() const { return NotAMachineReg; } 1258 virtual uint match_edge(uint idx) const { return idx==2; } 1259 virtual const Type *bottom_type() const { return ( AllocatePrefetchStyle == 3 ) ? Type::MEMORY : Type::ABIO; } 1260 }; 1261 1262 #endif // SHARE_VM_OPTO_MEMNODE_HPP