Mercurial > hg > truffle
annotate src/share/vm/opto/memnode.hpp @ 985:685e959d09ea
6877254: Server vm crashes with no branches off of store slice" when run with CMS and UseSuperWord(default)
Summary: design StoreCMNode::Ideal to promote its oopStore input if the input is a MergeMem node
Reviewed-by: kvn, never
| author | cfang |
|---|---|
| date | Mon, 14 Sep 2009 09:49:54 -0700 |
| parents | fbde8ec322d0 |
| children | 62001a362ce9 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 624 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // Portions of code courtesy of Clifford Click | |
| 26 | |
| 27 class MultiNode; | |
| 28 class PhaseCCP; | |
| 29 class PhaseTransform; | |
| 30 | |
| 31 //------------------------------MemNode---------------------------------------- | |
| 32 // Load or Store, possibly throwing a NULL pointer exception | |
| 33 class MemNode : public Node { | |
| 34 protected: | |
| 35 #ifdef ASSERT | |
| 36 const TypePtr* _adr_type; // What kind of memory is being addressed? | |
| 37 #endif | |
| 38 virtual uint size_of() const; // Size is bigger (ASSERT only) | |
| 39 public: | |
| 40 enum { Control, // When is it safe to do this load? | |
| 41 Memory, // Chunk of memory is being loaded from | |
| 42 Address, // Actually address, derived from base | |
| 43 ValueIn, // Value to store | |
| 44 OopStore // Preceeding oop store, only in StoreCM | |
| 45 }; | |
| 46 protected: | |
| 47 MemNode( Node *c0, Node *c1, Node *c2, const TypePtr* at ) | |
| 48 : Node(c0,c1,c2 ) { | |
| 49 init_class_id(Class_Mem); | |
| 50 debug_only(_adr_type=at; adr_type();) | |
| 51 } | |
| 52 MemNode( Node *c0, Node *c1, Node *c2, const TypePtr* at, Node *c3 ) | |
| 53 : Node(c0,c1,c2,c3) { | |
| 54 init_class_id(Class_Mem); | |
| 55 debug_only(_adr_type=at; adr_type();) | |
| 56 } | |
| 57 MemNode( Node *c0, Node *c1, Node *c2, const TypePtr* at, Node *c3, Node *c4) | |
| 58 : Node(c0,c1,c2,c3,c4) { | |
| 59 init_class_id(Class_Mem); | |
| 60 debug_only(_adr_type=at; adr_type();) | |
| 61 } | |
| 62 | |
| 33 | 63 public: |
| 0 | 64 // Helpers for the optimizer. Documented in memnode.cpp. |
| 65 static bool detect_ptr_independence(Node* p1, AllocateNode* a1, | |
| 66 Node* p2, AllocateNode* a2, | |
| 67 PhaseTransform* phase); | |
| 68 static bool adr_phi_is_loop_invariant(Node* adr_phi, Node* cast); | |
| 69 | |
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70 static Node *optimize_simple_memory_chain(Node *mchain, const TypePtr *t_adr, PhaseGVN *phase); |
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71 static Node *optimize_memory_chain(Node *mchain, const TypePtr *t_adr, PhaseGVN *phase); |
| 0 | 72 // This one should probably be a phase-specific function: |
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73 static bool all_controls_dominate(Node* dom, Node* sub); |
| 0 | 74 |
| 163 | 75 // Find any cast-away of null-ness and keep its control. |
| 76 static Node *Ideal_common_DU_postCCP( PhaseCCP *ccp, Node* n, Node* adr ); | |
| 0 | 77 virtual Node *Ideal_DU_postCCP( PhaseCCP *ccp ); |
| 78 | |
| 79 virtual const class TypePtr *adr_type() const; // returns bottom_type of address | |
| 80 | |
| 81 // Shared code for Ideal methods: | |
| 82 Node *Ideal_common(PhaseGVN *phase, bool can_reshape); // Return -1 for short-circuit NULL. | |
| 83 | |
| 84 // Helper function for adr_type() implementations. | |
| 85 static const TypePtr* calculate_adr_type(const Type* t, const TypePtr* cross_check = NULL); | |
| 86 | |
| 87 // Raw access function, to allow copying of adr_type efficiently in | |
| 88 // product builds and retain the debug info for debug builds. | |
| 89 const TypePtr *raw_adr_type() const { | |
| 90 #ifdef ASSERT | |
| 91 return _adr_type; | |
| 92 #else | |
| 93 return 0; | |
| 94 #endif | |
| 95 } | |
| 96 | |
| 97 // Map a load or store opcode to its corresponding store opcode. | |
| 98 // (Return -1 if unknown.) | |
| 99 virtual int store_Opcode() const { return -1; } | |
| 100 | |
| 101 // What is the type of the value in memory? (T_VOID mean "unspecified".) | |
| 102 virtual BasicType memory_type() const = 0; | |
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103 virtual int memory_size() const { |
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104 #ifdef ASSERT |
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105 return type2aelembytes(memory_type(), true); |
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106 #else |
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107 return type2aelembytes(memory_type()); |
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108 #endif |
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109 } |
| 0 | 110 |
| 111 // Search through memory states which precede this node (load or store). | |
| 112 // Look for an exact match for the address, with no intervening | |
| 113 // aliased stores. | |
| 114 Node* find_previous_store(PhaseTransform* phase); | |
| 115 | |
| 116 // Can this node (load or store) accurately see a stored value in | |
| 117 // the given memory state? (The state may or may not be in(Memory).) | |
| 118 Node* can_see_stored_value(Node* st, PhaseTransform* phase) const; | |
| 119 | |
| 120 #ifndef PRODUCT | |
| 121 static void dump_adr_type(const Node* mem, const TypePtr* adr_type, outputStream *st); | |
| 122 virtual void dump_spec(outputStream *st) const; | |
| 123 #endif | |
| 124 }; | |
| 125 | |
| 126 //------------------------------LoadNode--------------------------------------- | |
| 127 // Load value; requires Memory and Address | |
| 128 class LoadNode : public MemNode { | |
| 129 protected: | |
| 130 virtual uint cmp( const Node &n ) const; | |
| 131 virtual uint size_of() const; // Size is bigger | |
| 132 const Type* const _type; // What kind of value is loaded? | |
| 133 public: | |
| 134 | |
| 135 LoadNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const Type *rt ) | |
| 136 : MemNode(c,mem,adr,at), _type(rt) { | |
| 137 init_class_id(Class_Load); | |
| 138 } | |
| 139 | |
| 140 // Polymorphic factory method: | |
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141 static Node* make( PhaseGVN& gvn, Node *c, Node *mem, Node *adr, |
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142 const TypePtr* at, const Type *rt, BasicType bt ); |
| 0 | 143 |
| 144 virtual uint hash() const; // Check the type | |
| 145 | |
| 146 // Handle algebraic identities here. If we have an identity, return the Node | |
| 147 // we are equivalent to. We look for Load of a Store. | |
| 148 virtual Node *Identity( PhaseTransform *phase ); | |
| 149 | |
| 150 // If the load is from Field memory and the pointer is non-null, we can | |
| 151 // zero out the control input. | |
| 152 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 153 | |
| 163 | 154 // Split instance field load through Phi. |
| 155 Node* split_through_phi(PhaseGVN *phase); | |
| 156 | |
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157 // Recover original value from boxed values |
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158 Node *eliminate_autobox(PhaseGVN *phase); |
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159 |
| 0 | 160 // Compute a new Type for this node. Basically we just do the pre-check, |
| 161 // then call the virtual add() to set the type. | |
| 162 virtual const Type *Value( PhaseTransform *phase ) const; | |
| 163 | |
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164 // Common methods for LoadKlass and LoadNKlass nodes. |
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165 const Type *klass_value_common( PhaseTransform *phase ) const; |
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166 Node *klass_identity_common( PhaseTransform *phase ); |
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167 |
| 0 | 168 virtual uint ideal_reg() const; |
| 169 virtual const Type *bottom_type() const; | |
| 170 // Following method is copied from TypeNode: | |
| 171 void set_type(const Type* t) { | |
| 172 assert(t != NULL, "sanity"); | |
| 173 debug_only(uint check_hash = (VerifyHashTableKeys && _hash_lock) ? hash() : NO_HASH); | |
| 174 *(const Type**)&_type = t; // cast away const-ness | |
| 175 // If this node is in the hash table, make sure it doesn't need a rehash. | |
| 176 assert(check_hash == NO_HASH || check_hash == hash(), "type change must preserve hash code"); | |
| 177 } | |
| 178 const Type* type() const { assert(_type != NULL, "sanity"); return _type; }; | |
| 179 | |
| 180 // Do not match memory edge | |
| 181 virtual uint match_edge(uint idx) const; | |
| 182 | |
| 183 // Map a load opcode to its corresponding store opcode. | |
| 184 virtual int store_Opcode() const = 0; | |
| 185 | |
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186 // Check if the load's memory input is a Phi node with the same control. |
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187 bool is_instance_field_load_with_local_phi(Node* ctrl); |
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188 |
| 0 | 189 #ifndef PRODUCT |
| 190 virtual void dump_spec(outputStream *st) const; | |
| 191 #endif | |
| 192 protected: | |
| 193 const Type* load_array_final_field(const TypeKlassPtr *tkls, | |
| 194 ciKlass* klass) const; | |
| 195 }; | |
| 196 | |
| 197 //------------------------------LoadBNode-------------------------------------- | |
| 198 // Load a byte (8bits signed) from memory | |
| 199 class LoadBNode : public LoadNode { | |
| 200 public: | |
| 201 LoadBNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeInt *ti = TypeInt::BYTE ) | |
| 202 : LoadNode(c,mem,adr,at,ti) {} | |
| 203 virtual int Opcode() const; | |
| 204 virtual uint ideal_reg() const { return Op_RegI; } | |
| 205 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 206 virtual int store_Opcode() const { return Op_StoreB; } | |
| 207 virtual BasicType memory_type() const { return T_BYTE; } | |
| 208 }; | |
| 209 | |
| 624 | 210 //------------------------------LoadUBNode------------------------------------- |
| 211 // Load a unsigned byte (8bits unsigned) from memory | |
| 212 class LoadUBNode : public LoadNode { | |
| 213 public: | |
| 214 LoadUBNode(Node* c, Node* mem, Node* adr, const TypePtr* at, const TypeInt* ti = TypeInt::UBYTE ) | |
| 215 : LoadNode(c, mem, adr, at, ti) {} | |
| 216 virtual int Opcode() const; | |
| 217 virtual uint ideal_reg() const { return Op_RegI; } | |
| 218 virtual Node* Ideal(PhaseGVN *phase, bool can_reshape); | |
| 219 virtual int store_Opcode() const { return Op_StoreB; } | |
| 220 virtual BasicType memory_type() const { return T_BYTE; } | |
| 221 }; | |
| 222 | |
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223 //------------------------------LoadUSNode------------------------------------- |
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224 // Load an unsigned short/char (16bits unsigned) from memory |
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225 class LoadUSNode : public LoadNode { |
| 0 | 226 public: |
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227 LoadUSNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeInt *ti = TypeInt::CHAR ) |
| 0 | 228 : LoadNode(c,mem,adr,at,ti) {} |
| 229 virtual int Opcode() const; | |
| 230 virtual uint ideal_reg() const { return Op_RegI; } | |
| 231 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 232 virtual int store_Opcode() const { return Op_StoreC; } | |
| 233 virtual BasicType memory_type() const { return T_CHAR; } | |
| 234 }; | |
| 235 | |
| 236 //------------------------------LoadINode-------------------------------------- | |
| 237 // Load an integer from memory | |
| 238 class LoadINode : public LoadNode { | |
| 239 public: | |
| 240 LoadINode( Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeInt *ti = TypeInt::INT ) | |
| 241 : LoadNode(c,mem,adr,at,ti) {} | |
| 242 virtual int Opcode() const; | |
| 243 virtual uint ideal_reg() const { return Op_RegI; } | |
| 244 virtual int store_Opcode() const { return Op_StoreI; } | |
| 245 virtual BasicType memory_type() const { return T_INT; } | |
| 246 }; | |
| 247 | |
| 624 | 248 //------------------------------LoadUI2LNode----------------------------------- |
| 249 // Load an unsigned integer into long from memory | |
| 250 class LoadUI2LNode : public LoadNode { | |
| 251 public: | |
| 252 LoadUI2LNode(Node* c, Node* mem, Node* adr, const TypePtr* at, const TypeLong* t = TypeLong::UINT) | |
| 253 : LoadNode(c, mem, adr, at, t) {} | |
| 254 virtual int Opcode() const; | |
| 255 virtual uint ideal_reg() const { return Op_RegL; } | |
| 256 virtual int store_Opcode() const { return Op_StoreL; } | |
| 257 virtual BasicType memory_type() const { return T_LONG; } | |
| 258 }; | |
| 259 | |
| 0 | 260 //------------------------------LoadRangeNode---------------------------------- |
| 261 // Load an array length from the array | |
| 262 class LoadRangeNode : public LoadINode { | |
| 263 public: | |
| 264 LoadRangeNode( Node *c, Node *mem, Node *adr, const TypeInt *ti = TypeInt::POS ) | |
| 265 : LoadINode(c,mem,adr,TypeAryPtr::RANGE,ti) {} | |
| 266 virtual int Opcode() const; | |
| 267 virtual const Type *Value( PhaseTransform *phase ) const; | |
| 268 virtual Node *Identity( PhaseTransform *phase ); | |
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269 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); |
| 0 | 270 }; |
| 271 | |
| 272 //------------------------------LoadLNode-------------------------------------- | |
| 273 // Load a long from memory | |
| 274 class LoadLNode : public LoadNode { | |
| 275 virtual uint hash() const { return LoadNode::hash() + _require_atomic_access; } | |
| 276 virtual uint cmp( const Node &n ) const { | |
| 277 return _require_atomic_access == ((LoadLNode&)n)._require_atomic_access | |
| 278 && LoadNode::cmp(n); | |
| 279 } | |
| 280 virtual uint size_of() const { return sizeof(*this); } | |
| 281 const bool _require_atomic_access; // is piecewise load forbidden? | |
| 282 | |
| 283 public: | |
| 284 LoadLNode( Node *c, Node *mem, Node *adr, const TypePtr* at, | |
| 285 const TypeLong *tl = TypeLong::LONG, | |
| 286 bool require_atomic_access = false ) | |
| 287 : LoadNode(c,mem,adr,at,tl) | |
| 288 , _require_atomic_access(require_atomic_access) | |
| 289 {} | |
| 290 virtual int Opcode() const; | |
| 291 virtual uint ideal_reg() const { return Op_RegL; } | |
| 292 virtual int store_Opcode() const { return Op_StoreL; } | |
| 293 virtual BasicType memory_type() const { return T_LONG; } | |
| 294 bool require_atomic_access() { return _require_atomic_access; } | |
| 295 static LoadLNode* make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, const Type* rt); | |
| 296 #ifndef PRODUCT | |
| 297 virtual void dump_spec(outputStream *st) const { | |
| 298 LoadNode::dump_spec(st); | |
| 299 if (_require_atomic_access) st->print(" Atomic!"); | |
| 300 } | |
| 301 #endif | |
| 302 }; | |
| 303 | |
| 304 //------------------------------LoadL_unalignedNode---------------------------- | |
| 305 // Load a long from unaligned memory | |
| 306 class LoadL_unalignedNode : public LoadLNode { | |
| 307 public: | |
| 308 LoadL_unalignedNode( Node *c, Node *mem, Node *adr, const TypePtr* at ) | |
| 309 : LoadLNode(c,mem,adr,at) {} | |
| 310 virtual int Opcode() const; | |
| 311 }; | |
| 312 | |
| 313 //------------------------------LoadFNode-------------------------------------- | |
| 314 // Load a float (64 bits) from memory | |
| 315 class LoadFNode : public LoadNode { | |
| 316 public: | |
| 317 LoadFNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const Type *t = Type::FLOAT ) | |
| 318 : LoadNode(c,mem,adr,at,t) {} | |
| 319 virtual int Opcode() const; | |
| 320 virtual uint ideal_reg() const { return Op_RegF; } | |
| 321 virtual int store_Opcode() const { return Op_StoreF; } | |
| 322 virtual BasicType memory_type() const { return T_FLOAT; } | |
| 323 }; | |
| 324 | |
| 325 //------------------------------LoadDNode-------------------------------------- | |
| 326 // Load a double (64 bits) from memory | |
| 327 class LoadDNode : public LoadNode { | |
| 328 public: | |
| 329 LoadDNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const Type *t = Type::DOUBLE ) | |
| 330 : LoadNode(c,mem,adr,at,t) {} | |
| 331 virtual int Opcode() const; | |
| 332 virtual uint ideal_reg() const { return Op_RegD; } | |
| 333 virtual int store_Opcode() const { return Op_StoreD; } | |
| 334 virtual BasicType memory_type() const { return T_DOUBLE; } | |
| 335 }; | |
| 336 | |
| 337 //------------------------------LoadD_unalignedNode---------------------------- | |
| 338 // Load a double from unaligned memory | |
| 339 class LoadD_unalignedNode : public LoadDNode { | |
| 340 public: | |
| 341 LoadD_unalignedNode( Node *c, Node *mem, Node *adr, const TypePtr* at ) | |
| 342 : LoadDNode(c,mem,adr,at) {} | |
| 343 virtual int Opcode() const; | |
| 344 }; | |
| 345 | |
| 346 //------------------------------LoadPNode-------------------------------------- | |
| 347 // Load a pointer from memory (either object or array) | |
| 348 class LoadPNode : public LoadNode { | |
| 349 public: | |
| 350 LoadPNode( Node *c, Node *mem, Node *adr, const TypePtr *at, const TypePtr* t ) | |
| 351 : LoadNode(c,mem,adr,at,t) {} | |
| 352 virtual int Opcode() const; | |
| 353 virtual uint ideal_reg() const { return Op_RegP; } | |
| 354 virtual int store_Opcode() const { return Op_StoreP; } | |
| 355 virtual BasicType memory_type() const { return T_ADDRESS; } | |
| 356 // depends_only_on_test is almost always true, and needs to be almost always | |
| 357 // true to enable key hoisting & commoning optimizations. However, for the | |
| 358 // special case of RawPtr loads from TLS top & end, the control edge carries | |
| 359 // the dependence preventing hoisting past a Safepoint instead of the memory | |
| 360 // edge. (An unfortunate consequence of having Safepoints not set Raw | |
| 361 // Memory; itself an unfortunate consequence of having Nodes which produce | |
| 362 // results (new raw memory state) inside of loops preventing all manner of | |
| 363 // other optimizations). Basically, it's ugly but so is the alternative. | |
| 364 // See comment in macro.cpp, around line 125 expand_allocate_common(). | |
| 365 virtual bool depends_only_on_test() const { return adr_type() != TypeRawPtr::BOTTOM; } | |
| 366 }; | |
| 367 | |
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368 |
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369 //------------------------------LoadNNode-------------------------------------- |
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370 // Load a narrow oop from memory (either object or array) |
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371 class LoadNNode : public LoadNode { |
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372 public: |
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373 LoadNNode( Node *c, Node *mem, Node *adr, const TypePtr *at, const Type* t ) |
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374 : LoadNode(c,mem,adr,at,t) {} |
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375 virtual int Opcode() const; |
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376 virtual uint ideal_reg() const { return Op_RegN; } |
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377 virtual int store_Opcode() const { return Op_StoreN; } |
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378 virtual BasicType memory_type() const { return T_NARROWOOP; } |
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379 // depends_only_on_test is almost always true, and needs to be almost always |
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380 // true to enable key hoisting & commoning optimizations. However, for the |
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381 // special case of RawPtr loads from TLS top & end, the control edge carries |
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382 // the dependence preventing hoisting past a Safepoint instead of the memory |
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383 // edge. (An unfortunate consequence of having Safepoints not set Raw |
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384 // Memory; itself an unfortunate consequence of having Nodes which produce |
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385 // results (new raw memory state) inside of loops preventing all manner of |
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386 // other optimizations). Basically, it's ugly but so is the alternative. |
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387 // See comment in macro.cpp, around line 125 expand_allocate_common(). |
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388 virtual bool depends_only_on_test() const { return adr_type() != TypeRawPtr::BOTTOM; } |
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389 }; |
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390 |
| 0 | 391 //------------------------------LoadKlassNode---------------------------------- |
| 392 // Load a Klass from an object | |
| 393 class LoadKlassNode : public LoadPNode { | |
| 394 public: | |
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395 LoadKlassNode( Node *c, Node *mem, Node *adr, const TypePtr *at, const TypeKlassPtr *tk ) |
| 0 | 396 : LoadPNode(c,mem,adr,at,tk) {} |
| 397 virtual int Opcode() const; | |
| 398 virtual const Type *Value( PhaseTransform *phase ) const; | |
| 399 virtual Node *Identity( PhaseTransform *phase ); | |
| 400 virtual bool depends_only_on_test() const { return true; } | |
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401 |
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402 // Polymorphic factory method: |
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403 static Node* make( PhaseGVN& gvn, Node *mem, Node *adr, const TypePtr* at, |
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404 const TypeKlassPtr *tk = TypeKlassPtr::OBJECT ); |
| 0 | 405 }; |
| 406 | |
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407 //------------------------------LoadNKlassNode--------------------------------- |
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408 // Load a narrow Klass from an object. |
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409 class LoadNKlassNode : public LoadNNode { |
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410 public: |
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411 LoadNKlassNode( Node *c, Node *mem, Node *adr, const TypePtr *at, const TypeNarrowOop *tk ) |
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412 : LoadNNode(c,mem,adr,at,tk) {} |
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413 virtual int Opcode() const; |
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414 virtual uint ideal_reg() const { return Op_RegN; } |
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415 virtual int store_Opcode() const { return Op_StoreN; } |
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416 virtual BasicType memory_type() const { return T_NARROWOOP; } |
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417 |
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418 virtual const Type *Value( PhaseTransform *phase ) const; |
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419 virtual Node *Identity( PhaseTransform *phase ); |
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420 virtual bool depends_only_on_test() const { return true; } |
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421 }; |
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422 |
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423 |
| 0 | 424 //------------------------------LoadSNode-------------------------------------- |
| 425 // Load a short (16bits signed) from memory | |
| 426 class LoadSNode : public LoadNode { | |
| 427 public: | |
| 428 LoadSNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeInt *ti = TypeInt::SHORT ) | |
| 429 : LoadNode(c,mem,adr,at,ti) {} | |
| 430 virtual int Opcode() const; | |
| 431 virtual uint ideal_reg() const { return Op_RegI; } | |
| 432 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 433 virtual int store_Opcode() const { return Op_StoreC; } | |
| 434 virtual BasicType memory_type() const { return T_SHORT; } | |
| 435 }; | |
| 436 | |
| 437 //------------------------------StoreNode-------------------------------------- | |
| 438 // Store value; requires Store, Address and Value | |
| 439 class StoreNode : public MemNode { | |
| 440 protected: | |
| 441 virtual uint cmp( const Node &n ) const; | |
| 442 virtual bool depends_only_on_test() const { return false; } | |
| 443 | |
| 444 Node *Ideal_masked_input (PhaseGVN *phase, uint mask); | |
| 445 Node *Ideal_sign_extended_input(PhaseGVN *phase, int num_bits); | |
| 446 | |
| 447 public: | |
| 448 StoreNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) | |
| 449 : MemNode(c,mem,adr,at,val) { | |
| 450 init_class_id(Class_Store); | |
| 451 } | |
| 452 StoreNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, Node *oop_store ) | |
| 453 : MemNode(c,mem,adr,at,val,oop_store) { | |
| 454 init_class_id(Class_Store); | |
| 455 } | |
| 456 | |
| 457 // Polymorphic factory method: | |
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458 static StoreNode* make( PhaseGVN& gvn, Node *c, Node *mem, Node *adr, |
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459 const TypePtr* at, Node *val, BasicType bt ); |
| 0 | 460 |
| 461 virtual uint hash() const; // Check the type | |
| 462 | |
| 463 // If the store is to Field memory and the pointer is non-null, we can | |
| 464 // zero out the control input. | |
| 465 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 466 | |
| 467 // Compute a new Type for this node. Basically we just do the pre-check, | |
| 468 // then call the virtual add() to set the type. | |
| 469 virtual const Type *Value( PhaseTransform *phase ) const; | |
| 470 | |
| 471 // Check for identity function on memory (Load then Store at same address) | |
| 472 virtual Node *Identity( PhaseTransform *phase ); | |
| 473 | |
| 474 // Do not match memory edge | |
| 475 virtual uint match_edge(uint idx) const; | |
| 476 | |
| 477 virtual const Type *bottom_type() const; // returns Type::MEMORY | |
| 478 | |
| 479 // Map a store opcode to its corresponding own opcode, trivially. | |
| 480 virtual int store_Opcode() const { return Opcode(); } | |
| 481 | |
| 482 // have all possible loads of the value stored been optimized away? | |
| 483 bool value_never_loaded(PhaseTransform *phase) const; | |
| 484 }; | |
| 485 | |
| 486 //------------------------------StoreBNode------------------------------------- | |
| 487 // Store byte to memory | |
| 488 class StoreBNode : public StoreNode { | |
| 489 public: | |
| 490 StoreBNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} | |
| 491 virtual int Opcode() const; | |
| 492 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 493 virtual BasicType memory_type() const { return T_BYTE; } | |
| 494 }; | |
| 495 | |
| 496 //------------------------------StoreCNode------------------------------------- | |
| 497 // Store char/short to memory | |
| 498 class StoreCNode : public StoreNode { | |
| 499 public: | |
| 500 StoreCNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} | |
| 501 virtual int Opcode() const; | |
| 502 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 503 virtual BasicType memory_type() const { return T_CHAR; } | |
| 504 }; | |
| 505 | |
| 506 //------------------------------StoreINode------------------------------------- | |
| 507 // Store int to memory | |
| 508 class StoreINode : public StoreNode { | |
| 509 public: | |
| 510 StoreINode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} | |
| 511 virtual int Opcode() const; | |
| 512 virtual BasicType memory_type() const { return T_INT; } | |
| 513 }; | |
| 514 | |
| 515 //------------------------------StoreLNode------------------------------------- | |
| 516 // Store long to memory | |
| 517 class StoreLNode : public StoreNode { | |
| 518 virtual uint hash() const { return StoreNode::hash() + _require_atomic_access; } | |
| 519 virtual uint cmp( const Node &n ) const { | |
| 520 return _require_atomic_access == ((StoreLNode&)n)._require_atomic_access | |
| 521 && StoreNode::cmp(n); | |
| 522 } | |
| 523 virtual uint size_of() const { return sizeof(*this); } | |
| 524 const bool _require_atomic_access; // is piecewise store forbidden? | |
| 525 | |
| 526 public: | |
| 527 StoreLNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, | |
| 528 bool require_atomic_access = false ) | |
| 529 : StoreNode(c,mem,adr,at,val) | |
| 530 , _require_atomic_access(require_atomic_access) | |
| 531 {} | |
| 532 virtual int Opcode() const; | |
| 533 virtual BasicType memory_type() const { return T_LONG; } | |
| 534 bool require_atomic_access() { return _require_atomic_access; } | |
| 535 static StoreLNode* make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val); | |
| 536 #ifndef PRODUCT | |
| 537 virtual void dump_spec(outputStream *st) const { | |
| 538 StoreNode::dump_spec(st); | |
| 539 if (_require_atomic_access) st->print(" Atomic!"); | |
| 540 } | |
| 541 #endif | |
| 542 }; | |
| 543 | |
| 544 //------------------------------StoreFNode------------------------------------- | |
| 545 // Store float to memory | |
| 546 class StoreFNode : public StoreNode { | |
| 547 public: | |
| 548 StoreFNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} | |
| 549 virtual int Opcode() const; | |
| 550 virtual BasicType memory_type() const { return T_FLOAT; } | |
| 551 }; | |
| 552 | |
| 553 //------------------------------StoreDNode------------------------------------- | |
| 554 // Store double to memory | |
| 555 class StoreDNode : public StoreNode { | |
| 556 public: | |
| 557 StoreDNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} | |
| 558 virtual int Opcode() const; | |
| 559 virtual BasicType memory_type() const { return T_DOUBLE; } | |
| 560 }; | |
| 561 | |
| 562 //------------------------------StorePNode------------------------------------- | |
| 563 // Store pointer to memory | |
| 564 class StorePNode : public StoreNode { | |
| 565 public: | |
| 566 StorePNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} | |
| 567 virtual int Opcode() const; | |
| 568 virtual BasicType memory_type() const { return T_ADDRESS; } | |
| 569 }; | |
| 570 | |
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571 //------------------------------StoreNNode------------------------------------- |
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572 // Store narrow oop to memory |
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573 class StoreNNode : public StoreNode { |
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574 public: |
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575 StoreNNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} |
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576 virtual int Opcode() const; |
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577 virtual BasicType memory_type() const { return T_NARROWOOP; } |
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578 }; |
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579 |
| 0 | 580 //------------------------------StoreCMNode----------------------------------- |
| 581 // Store card-mark byte to memory for CM | |
| 582 // The last StoreCM before a SafePoint must be preserved and occur after its "oop" store | |
| 583 // Preceeding equivalent StoreCMs may be eliminated. | |
| 584 class StoreCMNode : public StoreNode { | |
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585 private: |
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586 int _oop_alias_idx; // The alias_idx of OopStore |
| 0 | 587 public: |
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588 StoreCMNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, Node *oop_store, int oop_alias_idx ) : StoreNode(c,mem,adr,at,val,oop_store), _oop_alias_idx(oop_alias_idx) {} |
| 0 | 589 virtual int Opcode() const; |
| 590 virtual Node *Identity( PhaseTransform *phase ); | |
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591 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); |
| 0 | 592 virtual const Type *Value( PhaseTransform *phase ) const; |
| 593 virtual BasicType memory_type() const { return T_VOID; } // unspecific | |
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594 int oop_alias_idx() const { return _oop_alias_idx; } |
| 0 | 595 }; |
| 596 | |
| 597 //------------------------------LoadPLockedNode--------------------------------- | |
| 598 // Load-locked a pointer from memory (either object or array). | |
| 599 // On Sparc & Intel this is implemented as a normal pointer load. | |
| 600 // On PowerPC and friends it's a real load-locked. | |
| 601 class LoadPLockedNode : public LoadPNode { | |
| 602 public: | |
| 603 LoadPLockedNode( Node *c, Node *mem, Node *adr ) | |
| 604 : LoadPNode(c,mem,adr,TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM) {} | |
| 605 virtual int Opcode() const; | |
| 606 virtual int store_Opcode() const { return Op_StorePConditional; } | |
| 607 virtual bool depends_only_on_test() const { return true; } | |
| 608 }; | |
| 609 | |
| 610 //------------------------------LoadLLockedNode--------------------------------- | |
| 611 // Load-locked a pointer from memory (either object or array). | |
| 612 // On Sparc & Intel this is implemented as a normal long load. | |
| 613 class LoadLLockedNode : public LoadLNode { | |
| 614 public: | |
| 615 LoadLLockedNode( Node *c, Node *mem, Node *adr ) | |
| 616 : LoadLNode(c,mem,adr,TypeRawPtr::BOTTOM, TypeLong::LONG) {} | |
| 617 virtual int Opcode() const; | |
| 618 virtual int store_Opcode() const { return Op_StoreLConditional; } | |
| 619 }; | |
| 620 | |
| 621 //------------------------------SCMemProjNode--------------------------------------- | |
| 622 // This class defines a projection of the memory state of a store conditional node. | |
| 623 // These nodes return a value, but also update memory. | |
| 624 class SCMemProjNode : public ProjNode { | |
| 625 public: | |
| 626 enum {SCMEMPROJCON = (uint)-2}; | |
| 627 SCMemProjNode( Node *src) : ProjNode( src, SCMEMPROJCON) { } | |
| 628 virtual int Opcode() const; | |
| 629 virtual bool is_CFG() const { return false; } | |
| 630 virtual const Type *bottom_type() const {return Type::MEMORY;} | |
| 631 virtual const TypePtr *adr_type() const { return in(0)->in(MemNode::Memory)->adr_type();} | |
| 632 virtual uint ideal_reg() const { return 0;} // memory projections don't have a register | |
| 633 virtual const Type *Value( PhaseTransform *phase ) const; | |
| 634 #ifndef PRODUCT | |
| 635 virtual void dump_spec(outputStream *st) const {}; | |
| 636 #endif | |
| 637 }; | |
| 638 | |
| 639 //------------------------------LoadStoreNode--------------------------- | |
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640 // Note: is_Mem() method returns 'true' for this class. |
| 0 | 641 class LoadStoreNode : public Node { |
| 642 public: | |
| 643 enum { | |
| 644 ExpectedIn = MemNode::ValueIn+1 // One more input than MemNode | |
| 645 }; | |
| 646 LoadStoreNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex); | |
| 647 virtual bool depends_only_on_test() const { return false; } | |
| 648 virtual const Type *bottom_type() const { return TypeInt::BOOL; } | |
| 649 virtual uint ideal_reg() const { return Op_RegI; } | |
| 650 virtual uint match_edge(uint idx) const { return idx == MemNode::Address || idx == MemNode::ValueIn; } | |
| 651 }; | |
| 652 | |
| 653 //------------------------------StorePConditionalNode--------------------------- | |
| 654 // Conditionally store pointer to memory, if no change since prior | |
| 655 // load-locked. Sets flags for success or failure of the store. | |
| 656 class StorePConditionalNode : public LoadStoreNode { | |
| 657 public: | |
| 658 StorePConditionalNode( Node *c, Node *mem, Node *adr, Node *val, Node *ll ) : LoadStoreNode(c, mem, adr, val, ll) { } | |
| 659 virtual int Opcode() const; | |
| 660 // Produces flags | |
| 661 virtual uint ideal_reg() const { return Op_RegFlags; } | |
| 662 }; | |
| 663 | |
|
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664 //------------------------------StoreIConditionalNode--------------------------- |
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665 // Conditionally store int to memory, if no change since prior |
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666 // load-locked. Sets flags for success or failure of the store. |
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667 class StoreIConditionalNode : public LoadStoreNode { |
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668 public: |
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669 StoreIConditionalNode( Node *c, Node *mem, Node *adr, Node *val, Node *ii ) : LoadStoreNode(c, mem, adr, val, ii) { } |
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670 virtual int Opcode() const; |
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671 // Produces flags |
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672 virtual uint ideal_reg() const { return Op_RegFlags; } |
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673 }; |
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674 |
| 0 | 675 //------------------------------StoreLConditionalNode--------------------------- |
| 676 // Conditionally store long to memory, if no change since prior | |
| 677 // load-locked. Sets flags for success or failure of the store. | |
| 678 class StoreLConditionalNode : public LoadStoreNode { | |
| 679 public: | |
| 680 StoreLConditionalNode( Node *c, Node *mem, Node *adr, Node *val, Node *ll ) : LoadStoreNode(c, mem, adr, val, ll) { } | |
| 681 virtual int Opcode() const; | |
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682 // Produces flags |
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683 virtual uint ideal_reg() const { return Op_RegFlags; } |
| 0 | 684 }; |
| 685 | |
| 686 | |
| 687 //------------------------------CompareAndSwapLNode--------------------------- | |
| 688 class CompareAndSwapLNode : public LoadStoreNode { | |
| 689 public: | |
| 690 CompareAndSwapLNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } | |
| 691 virtual int Opcode() const; | |
| 692 }; | |
| 693 | |
| 694 | |
| 695 //------------------------------CompareAndSwapINode--------------------------- | |
| 696 class CompareAndSwapINode : public LoadStoreNode { | |
| 697 public: | |
| 698 CompareAndSwapINode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } | |
| 699 virtual int Opcode() const; | |
| 700 }; | |
| 701 | |
| 702 | |
| 703 //------------------------------CompareAndSwapPNode--------------------------- | |
| 704 class CompareAndSwapPNode : public LoadStoreNode { | |
| 705 public: | |
| 706 CompareAndSwapPNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } | |
| 707 virtual int Opcode() const; | |
| 708 }; | |
| 709 | |
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710 //------------------------------CompareAndSwapNNode--------------------------- |
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711 class CompareAndSwapNNode : public LoadStoreNode { |
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712 public: |
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713 CompareAndSwapNNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } |
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714 virtual int Opcode() const; |
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715 }; |
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716 |
| 0 | 717 //------------------------------ClearArray------------------------------------- |
| 718 class ClearArrayNode: public Node { | |
| 719 public: | |
| 720 ClearArrayNode( Node *ctrl, Node *arymem, Node *word_cnt, Node *base ) : Node(ctrl,arymem,word_cnt,base) {} | |
| 721 virtual int Opcode() const; | |
| 722 virtual const Type *bottom_type() const { return Type::MEMORY; } | |
| 723 // ClearArray modifies array elements, and so affects only the | |
| 724 // array memory addressed by the bottom_type of its base address. | |
| 725 virtual const class TypePtr *adr_type() const; | |
| 726 virtual Node *Identity( PhaseTransform *phase ); | |
| 727 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 728 virtual uint match_edge(uint idx) const; | |
| 729 | |
| 730 // Clear the given area of an object or array. | |
| 731 // The start offset must always be aligned mod BytesPerInt. | |
| 732 // The end offset must always be aligned mod BytesPerLong. | |
| 733 // Return the new memory. | |
| 734 static Node* clear_memory(Node* control, Node* mem, Node* dest, | |
| 735 intptr_t start_offset, | |
| 736 intptr_t end_offset, | |
| 737 PhaseGVN* phase); | |
| 738 static Node* clear_memory(Node* control, Node* mem, Node* dest, | |
| 739 intptr_t start_offset, | |
| 740 Node* end_offset, | |
| 741 PhaseGVN* phase); | |
| 742 static Node* clear_memory(Node* control, Node* mem, Node* dest, | |
| 743 Node* start_offset, | |
| 744 Node* end_offset, | |
| 745 PhaseGVN* phase); | |
| 746 }; | |
| 747 | |
| 748 //------------------------------StrComp------------------------------------- | |
| 749 class StrCompNode: public Node { | |
| 750 public: | |
| 751 StrCompNode(Node *control, | |
| 752 Node* char_array_mem, | |
| 753 Node* value_mem, | |
| 754 Node* count_mem, | |
| 755 Node* offset_mem, | |
| 756 Node* s1, Node* s2): Node(control, | |
| 757 char_array_mem, | |
| 758 value_mem, | |
| 759 count_mem, | |
| 760 offset_mem, | |
| 761 s1, s2) {}; | |
| 762 virtual int Opcode() const; | |
| 763 virtual bool depends_only_on_test() const { return false; } | |
| 764 virtual const Type* bottom_type() const { return TypeInt::INT; } | |
| 765 // a StrCompNode (conservatively) aliases with everything: | |
| 766 virtual const TypePtr* adr_type() const { return TypePtr::BOTTOM; } | |
| 767 virtual uint match_edge(uint idx) const; | |
| 768 virtual uint ideal_reg() const { return Op_RegI; } | |
| 769 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 770 }; | |
| 771 | |
| 681 | 772 //------------------------------StrEquals------------------------------------- |
| 773 class StrEqualsNode: public Node { | |
| 774 public: | |
| 775 StrEqualsNode(Node *control, | |
| 776 Node* char_array_mem, | |
| 777 Node* value_mem, | |
| 778 Node* count_mem, | |
| 779 Node* offset_mem, | |
| 780 Node* s1, Node* s2): Node(control, | |
| 781 char_array_mem, | |
| 782 value_mem, | |
| 783 count_mem, | |
| 784 offset_mem, | |
| 785 s1, s2) {}; | |
| 786 virtual int Opcode() const; | |
| 787 virtual bool depends_only_on_test() const { return false; } | |
| 788 virtual const Type* bottom_type() const { return TypeInt::BOOL; } | |
| 789 // a StrEqualsNode (conservatively) aliases with everything: | |
| 790 virtual const TypePtr* adr_type() const { return TypePtr::BOTTOM; } | |
| 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 //------------------------------StrIndexOf------------------------------------- | |
| 797 class StrIndexOfNode: public Node { | |
| 798 public: | |
| 799 StrIndexOfNode(Node *control, | |
| 800 Node* char_array_mem, | |
| 801 Node* value_mem, | |
| 802 Node* count_mem, | |
| 803 Node* offset_mem, | |
| 804 Node* s1, Node* s2): Node(control, | |
| 805 char_array_mem, | |
| 806 value_mem, | |
| 807 count_mem, | |
| 808 offset_mem, | |
| 809 s1, s2) {}; | |
| 810 virtual int Opcode() const; | |
| 811 virtual bool depends_only_on_test() const { return false; } | |
| 812 virtual const Type* bottom_type() const { return TypeInt::INT; } | |
| 813 // a StrIndexOfNode (conservatively) aliases with everything: | |
| 814 virtual const TypePtr* adr_type() const { return TypePtr::BOTTOM; } | |
| 815 virtual uint match_edge(uint idx) const; | |
| 816 virtual uint ideal_reg() const { return Op_RegI; } | |
| 817 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 818 }; | |
| 819 | |
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820 //------------------------------AryEq--------------------------------------- |
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821 class AryEqNode: public Node { |
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822 public: |
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823 AryEqNode(Node *control, Node* s1, Node* s2): Node(control, s1, s2) {}; |
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824 virtual int Opcode() const; |
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825 virtual bool depends_only_on_test() const { return false; } |
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826 virtual const Type* bottom_type() const { return TypeInt::BOOL; } |
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827 virtual const TypePtr* adr_type() const { return TypeAryPtr::CHARS; } |
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828 virtual uint ideal_reg() const { return Op_RegI; } |
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829 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); |
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830 }; |
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831 |
| 0 | 832 //------------------------------MemBar----------------------------------------- |
| 833 // There are different flavors of Memory Barriers to match the Java Memory | |
| 834 // Model. Monitor-enter and volatile-load act as Aquires: no following ref | |
| 835 // can be moved to before them. We insert a MemBar-Acquire after a FastLock or | |
| 836 // volatile-load. Monitor-exit and volatile-store act as Release: no | |
| 605 | 837 // preceding ref can be moved to after them. We insert a MemBar-Release |
| 0 | 838 // before a FastUnlock or volatile-store. All volatiles need to be |
| 839 // serialized, so we follow all volatile-stores with a MemBar-Volatile to | |
| 605 | 840 // separate it from any following volatile-load. |
| 0 | 841 class MemBarNode: public MultiNode { |
| 842 virtual uint hash() const ; // { return NO_HASH; } | |
| 843 virtual uint cmp( const Node &n ) const ; // Always fail, except on self | |
| 844 | |
| 845 virtual uint size_of() const { return sizeof(*this); } | |
| 846 // Memory type this node is serializing. Usually either rawptr or bottom. | |
| 847 const TypePtr* _adr_type; | |
| 848 | |
| 849 public: | |
| 850 enum { | |
| 851 Precedent = TypeFunc::Parms // optional edge to force precedence | |
| 852 }; | |
| 853 MemBarNode(Compile* C, int alias_idx, Node* precedent); | |
| 854 virtual int Opcode() const = 0; | |
| 855 virtual const class TypePtr *adr_type() const { return _adr_type; } | |
| 856 virtual const Type *Value( PhaseTransform *phase ) const; | |
| 857 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 858 virtual uint match_edge(uint idx) const { return 0; } | |
| 859 virtual const Type *bottom_type() const { return TypeTuple::MEMBAR; } | |
| 860 virtual Node *match( const ProjNode *proj, const Matcher *m ); | |
| 861 // Factory method. Builds a wide or narrow membar. | |
| 862 // Optional 'precedent' becomes an extra edge if not null. | |
| 863 static MemBarNode* make(Compile* C, int opcode, | |
| 864 int alias_idx = Compile::AliasIdxBot, | |
| 865 Node* precedent = NULL); | |
| 866 }; | |
| 867 | |
| 868 // "Acquire" - no following ref can move before (but earlier refs can | |
| 869 // follow, like an early Load stalled in cache). Requires multi-cpu | |
| 870 // visibility. Inserted after a volatile load or FastLock. | |
| 871 class MemBarAcquireNode: public MemBarNode { | |
| 872 public: | |
| 873 MemBarAcquireNode(Compile* C, int alias_idx, Node* precedent) | |
| 874 : MemBarNode(C, alias_idx, precedent) {} | |
| 875 virtual int Opcode() const; | |
| 876 }; | |
| 877 | |
| 878 // "Release" - no earlier ref can move after (but later refs can move | |
| 879 // up, like a speculative pipelined cache-hitting Load). Requires | |
| 880 // multi-cpu visibility. Inserted before a volatile store or FastUnLock. | |
| 881 class MemBarReleaseNode: public MemBarNode { | |
| 882 public: | |
| 883 MemBarReleaseNode(Compile* C, int alias_idx, Node* precedent) | |
| 884 : MemBarNode(C, alias_idx, precedent) {} | |
| 885 virtual int Opcode() const; | |
| 886 }; | |
| 887 | |
| 888 // Ordering between a volatile store and a following volatile load. | |
| 889 // Requires multi-CPU visibility? | |
| 890 class MemBarVolatileNode: public MemBarNode { | |
| 891 public: | |
| 892 MemBarVolatileNode(Compile* C, int alias_idx, Node* precedent) | |
| 893 : MemBarNode(C, alias_idx, precedent) {} | |
| 894 virtual int Opcode() const; | |
| 895 }; | |
| 896 | |
| 897 // Ordering within the same CPU. Used to order unsafe memory references | |
| 898 // inside the compiler when we lack alias info. Not needed "outside" the | |
| 899 // compiler because the CPU does all the ordering for us. | |
| 900 class MemBarCPUOrderNode: public MemBarNode { | |
| 901 public: | |
| 902 MemBarCPUOrderNode(Compile* C, int alias_idx, Node* precedent) | |
| 903 : MemBarNode(C, alias_idx, precedent) {} | |
| 904 virtual int Opcode() const; | |
| 905 virtual uint ideal_reg() const { return 0; } // not matched in the AD file | |
| 906 }; | |
| 907 | |
| 908 // Isolation of object setup after an AllocateNode and before next safepoint. | |
| 909 // (See comment in memnode.cpp near InitializeNode::InitializeNode for semantics.) | |
| 910 class InitializeNode: public MemBarNode { | |
| 911 friend class AllocateNode; | |
| 912 | |
| 913 bool _is_complete; | |
| 914 | |
| 915 public: | |
| 916 enum { | |
| 917 Control = TypeFunc::Control, | |
| 918 Memory = TypeFunc::Memory, // MergeMem for states affected by this op | |
| 919 RawAddress = TypeFunc::Parms+0, // the newly-allocated raw address | |
| 920 RawStores = TypeFunc::Parms+1 // zero or more stores (or TOP) | |
| 921 }; | |
| 922 | |
| 923 InitializeNode(Compile* C, int adr_type, Node* rawoop); | |
| 924 virtual int Opcode() const; | |
| 925 virtual uint size_of() const { return sizeof(*this); } | |
| 926 virtual uint ideal_reg() const { return 0; } // not matched in the AD file | |
| 927 virtual const RegMask &in_RegMask(uint) const; // mask for RawAddress | |
| 928 | |
| 929 // Manage incoming memory edges via a MergeMem on in(Memory): | |
| 930 Node* memory(uint alias_idx); | |
| 931 | |
| 932 // The raw memory edge coming directly from the Allocation. | |
| 933 // The contents of this memory are *always* all-zero-bits. | |
| 934 Node* zero_memory() { return memory(Compile::AliasIdxRaw); } | |
| 935 | |
| 936 // Return the corresponding allocation for this initialization (or null if none). | |
| 937 // (Note: Both InitializeNode::allocation and AllocateNode::initialization | |
| 938 // are defined in graphKit.cpp, which sets up the bidirectional relation.) | |
| 939 AllocateNode* allocation(); | |
| 940 | |
| 941 // Anything other than zeroing in this init? | |
| 942 bool is_non_zero(); | |
| 943 | |
| 944 // An InitializeNode must completed before macro expansion is done. | |
| 945 // Completion requires that the AllocateNode must be followed by | |
| 946 // initialization of the new memory to zero, then to any initializers. | |
| 947 bool is_complete() { return _is_complete; } | |
| 948 | |
| 949 // Mark complete. (Must not yet be complete.) | |
| 950 void set_complete(PhaseGVN* phase); | |
| 951 | |
| 952 #ifdef ASSERT | |
| 953 // ensure all non-degenerate stores are ordered and non-overlapping | |
| 954 bool stores_are_sane(PhaseTransform* phase); | |
| 955 #endif //ASSERT | |
| 956 | |
| 957 // See if this store can be captured; return offset where it initializes. | |
| 958 // Return 0 if the store cannot be moved (any sort of problem). | |
| 959 intptr_t can_capture_store(StoreNode* st, PhaseTransform* phase); | |
| 960 | |
| 961 // Capture another store; reformat it to write my internal raw memory. | |
| 962 // Return the captured copy, else NULL if there is some sort of problem. | |
| 963 Node* capture_store(StoreNode* st, intptr_t start, PhaseTransform* phase); | |
| 964 | |
| 965 // Find captured store which corresponds to the range [start..start+size). | |
| 966 // Return my own memory projection (meaning the initial zero bits) | |
| 967 // if there is no such store. Return NULL if there is a problem. | |
| 968 Node* find_captured_store(intptr_t start, int size_in_bytes, PhaseTransform* phase); | |
| 969 | |
| 970 // Called when the associated AllocateNode is expanded into CFG. | |
| 971 Node* complete_stores(Node* rawctl, Node* rawmem, Node* rawptr, | |
| 972 intptr_t header_size, Node* size_in_bytes, | |
| 973 PhaseGVN* phase); | |
| 974 | |
| 975 private: | |
| 976 void remove_extra_zeroes(); | |
| 977 | |
| 978 // Find out where a captured store should be placed (or already is placed). | |
| 979 int captured_store_insertion_point(intptr_t start, int size_in_bytes, | |
| 980 PhaseTransform* phase); | |
| 981 | |
| 982 static intptr_t get_store_offset(Node* st, PhaseTransform* phase); | |
| 983 | |
| 984 Node* make_raw_address(intptr_t offset, PhaseTransform* phase); | |
| 985 | |
| 986 bool detect_init_independence(Node* n, bool st_is_pinned, int& count); | |
| 987 | |
| 988 void coalesce_subword_stores(intptr_t header_size, Node* size_in_bytes, | |
| 989 PhaseGVN* phase); | |
| 990 | |
| 991 intptr_t find_next_fullword_store(uint i, PhaseGVN* phase); | |
| 992 }; | |
| 993 | |
| 994 //------------------------------MergeMem--------------------------------------- | |
| 995 // (See comment in memnode.cpp near MergeMemNode::MergeMemNode for semantics.) | |
| 996 class MergeMemNode: public Node { | |
| 997 virtual uint hash() const ; // { return NO_HASH; } | |
| 998 virtual uint cmp( const Node &n ) const ; // Always fail, except on self | |
| 999 friend class MergeMemStream; | |
| 1000 MergeMemNode(Node* def); // clients use MergeMemNode::make | |
| 1001 | |
| 1002 public: | |
| 1003 // If the input is a whole memory state, clone it with all its slices intact. | |
| 1004 // Otherwise, make a new memory state with just that base memory input. | |
| 1005 // In either case, the result is a newly created MergeMem. | |
| 1006 static MergeMemNode* make(Compile* C, Node* base_memory); | |
| 1007 | |
| 1008 virtual int Opcode() const; | |
| 1009 virtual Node *Identity( PhaseTransform *phase ); | |
| 1010 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 1011 virtual uint ideal_reg() const { return NotAMachineReg; } | |
| 1012 virtual uint match_edge(uint idx) const { return 0; } | |
| 1013 virtual const RegMask &out_RegMask() const; | |
| 1014 virtual const Type *bottom_type() const { return Type::MEMORY; } | |
| 1015 virtual const TypePtr *adr_type() const { return TypePtr::BOTTOM; } | |
| 1016 // sparse accessors | |
| 1017 // Fetch the previously stored "set_memory_at", or else the base memory. | |
| 1018 // (Caller should clone it if it is a phi-nest.) | |
| 1019 Node* memory_at(uint alias_idx) const; | |
| 1020 // set the memory, regardless of its previous value | |
| 1021 void set_memory_at(uint alias_idx, Node* n); | |
| 1022 // the "base" is the memory that provides the non-finite support | |
| 1023 Node* base_memory() const { return in(Compile::AliasIdxBot); } | |
| 1024 // warning: setting the base can implicitly set any of the other slices too | |
| 1025 void set_base_memory(Node* def); | |
| 1026 // sentinel value which denotes a copy of the base memory: | |
| 1027 Node* empty_memory() const { return in(Compile::AliasIdxTop); } | |
| 1028 static Node* make_empty_memory(); // where the sentinel comes from | |
| 1029 bool is_empty_memory(Node* n) const { assert((n == empty_memory()) == n->is_top(), "sanity"); return n->is_top(); } | |
| 1030 // hook for the iterator, to perform any necessary setup | |
| 1031 void iteration_setup(const MergeMemNode* other = NULL); | |
| 1032 // push sentinels until I am at least as long as the other (semantic no-op) | |
| 1033 void grow_to_match(const MergeMemNode* other); | |
| 1034 bool verify_sparse() const PRODUCT_RETURN0; | |
| 1035 #ifndef PRODUCT | |
| 1036 virtual void dump_spec(outputStream *st) const; | |
| 1037 #endif | |
| 1038 }; | |
| 1039 | |
| 1040 class MergeMemStream : public StackObj { | |
| 1041 private: | |
| 1042 MergeMemNode* _mm; | |
| 1043 const MergeMemNode* _mm2; // optional second guy, contributes non-empty iterations | |
| 1044 Node* _mm_base; // loop-invariant base memory of _mm | |
| 1045 int _idx; | |
| 1046 int _cnt; | |
| 1047 Node* _mem; | |
| 1048 Node* _mem2; | |
| 1049 int _cnt2; | |
| 1050 | |
| 1051 void init(MergeMemNode* mm, const MergeMemNode* mm2 = NULL) { | |
| 1052 // subsume_node will break sparseness at times, whenever a memory slice | |
| 1053 // folds down to a copy of the base ("fat") memory. In such a case, | |
| 1054 // the raw edge will update to base, although it should be top. | |
| 1055 // This iterator will recognize either top or base_memory as an | |
| 1056 // "empty" slice. See is_empty, is_empty2, and next below. | |
| 1057 // | |
| 1058 // The sparseness property is repaired in MergeMemNode::Ideal. | |
| 1059 // As long as access to a MergeMem goes through this iterator | |
| 1060 // or the memory_at accessor, flaws in the sparseness will | |
| 1061 // never be observed. | |
| 1062 // | |
| 1063 // Also, iteration_setup repairs sparseness. | |
| 1064 assert(mm->verify_sparse(), "please, no dups of base"); | |
| 1065 assert(mm2==NULL || mm2->verify_sparse(), "please, no dups of base"); | |
| 1066 | |
| 1067 _mm = mm; | |
| 1068 _mm_base = mm->base_memory(); | |
| 1069 _mm2 = mm2; | |
| 1070 _cnt = mm->req(); | |
| 1071 _idx = Compile::AliasIdxBot-1; // start at the base memory | |
| 1072 _mem = NULL; | |
| 1073 _mem2 = NULL; | |
| 1074 } | |
| 1075 | |
| 1076 #ifdef ASSERT | |
| 1077 Node* check_memory() const { | |
| 1078 if (at_base_memory()) | |
| 1079 return _mm->base_memory(); | |
| 1080 else if ((uint)_idx < _mm->req() && !_mm->in(_idx)->is_top()) | |
| 1081 return _mm->memory_at(_idx); | |
| 1082 else | |
| 1083 return _mm_base; | |
| 1084 } | |
| 1085 Node* check_memory2() const { | |
| 1086 return at_base_memory()? _mm2->base_memory(): _mm2->memory_at(_idx); | |
| 1087 } | |
| 1088 #endif | |
| 1089 | |
| 1090 static bool match_memory(Node* mem, const MergeMemNode* mm, int idx) PRODUCT_RETURN0; | |
| 1091 void assert_synch() const { | |
| 1092 assert(!_mem || _idx >= _cnt || match_memory(_mem, _mm, _idx), | |
| 1093 "no side-effects except through the stream"); | |
| 1094 } | |
| 1095 | |
| 1096 public: | |
| 1097 | |
| 1098 // expected usages: | |
| 1099 // for (MergeMemStream mms(mem->is_MergeMem()); next_non_empty(); ) { ... } | |
| 1100 // for (MergeMemStream mms(mem1, mem2); next_non_empty2(); ) { ... } | |
| 1101 | |
| 1102 // iterate over one merge | |
| 1103 MergeMemStream(MergeMemNode* mm) { | |
| 1104 mm->iteration_setup(); | |
| 1105 init(mm); | |
| 1106 debug_only(_cnt2 = 999); | |
| 1107 } | |
| 1108 // iterate in parallel over two merges | |
| 1109 // only iterates through non-empty elements of mm2 | |
| 1110 MergeMemStream(MergeMemNode* mm, const MergeMemNode* mm2) { | |
| 1111 assert(mm2, "second argument must be a MergeMem also"); | |
| 1112 ((MergeMemNode*)mm2)->iteration_setup(); // update hidden state | |
| 1113 mm->iteration_setup(mm2); | |
| 1114 init(mm, mm2); | |
| 1115 _cnt2 = mm2->req(); | |
| 1116 } | |
| 1117 #ifdef ASSERT | |
| 1118 ~MergeMemStream() { | |
| 1119 assert_synch(); | |
| 1120 } | |
| 1121 #endif | |
| 1122 | |
| 1123 MergeMemNode* all_memory() const { | |
| 1124 return _mm; | |
| 1125 } | |
| 1126 Node* base_memory() const { | |
| 1127 assert(_mm_base == _mm->base_memory(), "no update to base memory, please"); | |
| 1128 return _mm_base; | |
| 1129 } | |
| 1130 const MergeMemNode* all_memory2() const { | |
| 1131 assert(_mm2 != NULL, ""); | |
| 1132 return _mm2; | |
| 1133 } | |
| 1134 bool at_base_memory() const { | |
| 1135 return _idx == Compile::AliasIdxBot; | |
| 1136 } | |
| 1137 int alias_idx() const { | |
| 1138 assert(_mem, "must call next 1st"); | |
| 1139 return _idx; | |
| 1140 } | |
| 1141 | |
| 1142 const TypePtr* adr_type() const { | |
| 1143 return Compile::current()->get_adr_type(alias_idx()); | |
| 1144 } | |
| 1145 | |
| 1146 const TypePtr* adr_type(Compile* C) const { | |
| 1147 return C->get_adr_type(alias_idx()); | |
| 1148 } | |
| 1149 bool is_empty() const { | |
| 1150 assert(_mem, "must call next 1st"); | |
| 1151 assert(_mem->is_top() == (_mem==_mm->empty_memory()), "correct sentinel"); | |
| 1152 return _mem->is_top(); | |
| 1153 } | |
| 1154 bool is_empty2() const { | |
| 1155 assert(_mem2, "must call next 1st"); | |
| 1156 assert(_mem2->is_top() == (_mem2==_mm2->empty_memory()), "correct sentinel"); | |
| 1157 return _mem2->is_top(); | |
| 1158 } | |
| 1159 Node* memory() const { | |
| 1160 assert(!is_empty(), "must not be empty"); | |
| 1161 assert_synch(); | |
| 1162 return _mem; | |
| 1163 } | |
| 1164 // get the current memory, regardless of empty or non-empty status | |
| 1165 Node* force_memory() const { | |
| 1166 assert(!is_empty() || !at_base_memory(), ""); | |
| 1167 // Use _mm_base to defend against updates to _mem->base_memory(). | |
| 1168 Node *mem = _mem->is_top() ? _mm_base : _mem; | |
| 1169 assert(mem == check_memory(), ""); | |
| 1170 return mem; | |
| 1171 } | |
| 1172 Node* memory2() const { | |
| 1173 assert(_mem2 == check_memory2(), ""); | |
| 1174 return _mem2; | |
| 1175 } | |
| 1176 void set_memory(Node* mem) { | |
| 1177 if (at_base_memory()) { | |
| 1178 // Note that this does not change the invariant _mm_base. | |
| 1179 _mm->set_base_memory(mem); | |
| 1180 } else { | |
| 1181 _mm->set_memory_at(_idx, mem); | |
| 1182 } | |
| 1183 _mem = mem; | |
| 1184 assert_synch(); | |
| 1185 } | |
| 1186 | |
| 1187 // Recover from a side effect to the MergeMemNode. | |
| 1188 void set_memory() { | |
| 1189 _mem = _mm->in(_idx); | |
| 1190 } | |
| 1191 | |
| 1192 bool next() { return next(false); } | |
| 1193 bool next2() { return next(true); } | |
| 1194 | |
| 1195 bool next_non_empty() { return next_non_empty(false); } | |
| 1196 bool next_non_empty2() { return next_non_empty(true); } | |
| 1197 // next_non_empty2 can yield states where is_empty() is true | |
| 1198 | |
| 1199 private: | |
| 1200 // find the next item, which might be empty | |
| 1201 bool next(bool have_mm2) { | |
| 1202 assert((_mm2 != NULL) == have_mm2, "use other next"); | |
| 1203 assert_synch(); | |
| 1204 if (++_idx < _cnt) { | |
| 1205 // Note: This iterator allows _mm to be non-sparse. | |
| 1206 // It behaves the same whether _mem is top or base_memory. | |
| 1207 _mem = _mm->in(_idx); | |
| 1208 if (have_mm2) | |
| 1209 _mem2 = _mm2->in((_idx < _cnt2) ? _idx : Compile::AliasIdxTop); | |
| 1210 return true; | |
| 1211 } | |
| 1212 return false; | |
| 1213 } | |
| 1214 | |
| 1215 // find the next non-empty item | |
| 1216 bool next_non_empty(bool have_mm2) { | |
| 1217 while (next(have_mm2)) { | |
| 1218 if (!is_empty()) { | |
| 1219 // make sure _mem2 is filled in sensibly | |
| 1220 if (have_mm2 && _mem2->is_top()) _mem2 = _mm2->base_memory(); | |
| 1221 return true; | |
| 1222 } else if (have_mm2 && !is_empty2()) { | |
| 1223 return true; // is_empty() == true | |
| 1224 } | |
| 1225 } | |
| 1226 return false; | |
| 1227 } | |
| 1228 }; | |
| 1229 | |
| 1230 //------------------------------Prefetch--------------------------------------- | |
| 1231 | |
| 1232 // Non-faulting prefetch load. Prefetch for many reads. | |
| 1233 class PrefetchReadNode : public Node { | |
| 1234 public: | |
| 1235 PrefetchReadNode(Node *abio, Node *adr) : Node(0,abio,adr) {} | |
| 1236 virtual int Opcode() const; | |
| 1237 virtual uint ideal_reg() const { return NotAMachineReg; } | |
| 1238 virtual uint match_edge(uint idx) const { return idx==2; } | |
| 1239 virtual const Type *bottom_type() const { return Type::ABIO; } | |
| 1240 }; | |
| 1241 | |
| 1242 // Non-faulting prefetch load. Prefetch for many reads & many writes. | |
| 1243 class PrefetchWriteNode : public Node { | |
| 1244 public: | |
| 1245 PrefetchWriteNode(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 }; |