Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/memnode.hpp @ 295:ea18057223c4
6732194: Data corruption dependent on -server/-client/-Xbatch
Summary: rematerializing nodes results in incorrect inputs
Reviewed-by: rasbold
author | never |
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date | Mon, 18 Aug 2008 23:17:51 -0700 |
parents | b0fe4deeb9fb |
children | 8261ee795323 |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 1997-2008 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 | |
164
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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 | |
210 //------------------------------LoadCNode-------------------------------------- | |
211 // Load a char (16bits unsigned) from memory | |
212 class LoadCNode : public LoadNode { | |
213 public: | |
214 LoadCNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeInt *ti = TypeInt::CHAR ) | |
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_StoreC; } | |
220 virtual BasicType memory_type() const { return T_CHAR; } | |
221 }; | |
222 | |
223 //------------------------------LoadINode-------------------------------------- | |
224 // Load an integer from memory | |
225 class LoadINode : public LoadNode { | |
226 public: | |
227 LoadINode( Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeInt *ti = TypeInt::INT ) | |
228 : LoadNode(c,mem,adr,at,ti) {} | |
229 virtual int Opcode() const; | |
230 virtual uint ideal_reg() const { return Op_RegI; } | |
231 virtual int store_Opcode() const { return Op_StoreI; } | |
232 virtual BasicType memory_type() const { return T_INT; } | |
233 }; | |
234 | |
235 //------------------------------LoadRangeNode---------------------------------- | |
236 // Load an array length from the array | |
237 class LoadRangeNode : public LoadINode { | |
238 public: | |
239 LoadRangeNode( Node *c, Node *mem, Node *adr, const TypeInt *ti = TypeInt::POS ) | |
240 : LoadINode(c,mem,adr,TypeAryPtr::RANGE,ti) {} | |
241 virtual int Opcode() const; | |
242 virtual const Type *Value( PhaseTransform *phase ) const; | |
243 virtual Node *Identity( PhaseTransform *phase ); | |
244 }; | |
245 | |
246 //------------------------------LoadLNode-------------------------------------- | |
247 // Load a long from memory | |
248 class LoadLNode : public LoadNode { | |
249 virtual uint hash() const { return LoadNode::hash() + _require_atomic_access; } | |
250 virtual uint cmp( const Node &n ) const { | |
251 return _require_atomic_access == ((LoadLNode&)n)._require_atomic_access | |
252 && LoadNode::cmp(n); | |
253 } | |
254 virtual uint size_of() const { return sizeof(*this); } | |
255 const bool _require_atomic_access; // is piecewise load forbidden? | |
256 | |
257 public: | |
258 LoadLNode( Node *c, Node *mem, Node *adr, const TypePtr* at, | |
259 const TypeLong *tl = TypeLong::LONG, | |
260 bool require_atomic_access = false ) | |
261 : LoadNode(c,mem,adr,at,tl) | |
262 , _require_atomic_access(require_atomic_access) | |
263 {} | |
264 virtual int Opcode() const; | |
265 virtual uint ideal_reg() const { return Op_RegL; } | |
266 virtual int store_Opcode() const { return Op_StoreL; } | |
267 virtual BasicType memory_type() const { return T_LONG; } | |
268 bool require_atomic_access() { return _require_atomic_access; } | |
269 static LoadLNode* make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, const Type* rt); | |
270 #ifndef PRODUCT | |
271 virtual void dump_spec(outputStream *st) const { | |
272 LoadNode::dump_spec(st); | |
273 if (_require_atomic_access) st->print(" Atomic!"); | |
274 } | |
275 #endif | |
276 }; | |
277 | |
278 //------------------------------LoadL_unalignedNode---------------------------- | |
279 // Load a long from unaligned memory | |
280 class LoadL_unalignedNode : public LoadLNode { | |
281 public: | |
282 LoadL_unalignedNode( Node *c, Node *mem, Node *adr, const TypePtr* at ) | |
283 : LoadLNode(c,mem,adr,at) {} | |
284 virtual int Opcode() const; | |
285 }; | |
286 | |
287 //------------------------------LoadFNode-------------------------------------- | |
288 // Load a float (64 bits) from memory | |
289 class LoadFNode : public LoadNode { | |
290 public: | |
291 LoadFNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const Type *t = Type::FLOAT ) | |
292 : LoadNode(c,mem,adr,at,t) {} | |
293 virtual int Opcode() const; | |
294 virtual uint ideal_reg() const { return Op_RegF; } | |
295 virtual int store_Opcode() const { return Op_StoreF; } | |
296 virtual BasicType memory_type() const { return T_FLOAT; } | |
297 }; | |
298 | |
299 //------------------------------LoadDNode-------------------------------------- | |
300 // Load a double (64 bits) from memory | |
301 class LoadDNode : public LoadNode { | |
302 public: | |
303 LoadDNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const Type *t = Type::DOUBLE ) | |
304 : LoadNode(c,mem,adr,at,t) {} | |
305 virtual int Opcode() const; | |
306 virtual uint ideal_reg() const { return Op_RegD; } | |
307 virtual int store_Opcode() const { return Op_StoreD; } | |
308 virtual BasicType memory_type() const { return T_DOUBLE; } | |
309 }; | |
310 | |
311 //------------------------------LoadD_unalignedNode---------------------------- | |
312 // Load a double from unaligned memory | |
313 class LoadD_unalignedNode : public LoadDNode { | |
314 public: | |
315 LoadD_unalignedNode( Node *c, Node *mem, Node *adr, const TypePtr* at ) | |
316 : LoadDNode(c,mem,adr,at) {} | |
317 virtual int Opcode() const; | |
318 }; | |
319 | |
320 //------------------------------LoadPNode-------------------------------------- | |
321 // Load a pointer from memory (either object or array) | |
322 class LoadPNode : public LoadNode { | |
323 public: | |
324 LoadPNode( Node *c, Node *mem, Node *adr, const TypePtr *at, const TypePtr* t ) | |
325 : LoadNode(c,mem,adr,at,t) {} | |
326 virtual int Opcode() const; | |
327 virtual uint ideal_reg() const { return Op_RegP; } | |
328 virtual int store_Opcode() const { return Op_StoreP; } | |
329 virtual BasicType memory_type() const { return T_ADDRESS; } | |
330 // depends_only_on_test is almost always true, and needs to be almost always | |
331 // true to enable key hoisting & commoning optimizations. However, for the | |
332 // special case of RawPtr loads from TLS top & end, the control edge carries | |
333 // the dependence preventing hoisting past a Safepoint instead of the memory | |
334 // edge. (An unfortunate consequence of having Safepoints not set Raw | |
335 // Memory; itself an unfortunate consequence of having Nodes which produce | |
336 // results (new raw memory state) inside of loops preventing all manner of | |
337 // other optimizations). Basically, it's ugly but so is the alternative. | |
338 // See comment in macro.cpp, around line 125 expand_allocate_common(). | |
339 virtual bool depends_only_on_test() const { return adr_type() != TypeRawPtr::BOTTOM; } | |
340 }; | |
341 | |
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342 |
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343 //------------------------------LoadNNode-------------------------------------- |
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344 // Load a narrow oop from memory (either object or array) |
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345 class LoadNNode : public LoadNode { |
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346 public: |
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347 LoadNNode( Node *c, Node *mem, Node *adr, const TypePtr *at, const Type* t ) |
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348 : LoadNode(c,mem,adr,at,t) {} |
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349 virtual int Opcode() const; |
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350 virtual uint ideal_reg() const { return Op_RegN; } |
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351 virtual int store_Opcode() const { return Op_StoreN; } |
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352 virtual BasicType memory_type() const { return T_NARROWOOP; } |
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353 // depends_only_on_test is almost always true, and needs to be almost always |
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354 // true to enable key hoisting & commoning optimizations. However, for the |
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355 // special case of RawPtr loads from TLS top & end, the control edge carries |
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356 // the dependence preventing hoisting past a Safepoint instead of the memory |
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357 // edge. (An unfortunate consequence of having Safepoints not set Raw |
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358 // Memory; itself an unfortunate consequence of having Nodes which produce |
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359 // results (new raw memory state) inside of loops preventing all manner of |
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360 // other optimizations). Basically, it's ugly but so is the alternative. |
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361 // See comment in macro.cpp, around line 125 expand_allocate_common(). |
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362 virtual bool depends_only_on_test() const { return adr_type() != TypeRawPtr::BOTTOM; } |
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363 }; |
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364 |
0 | 365 //------------------------------LoadKlassNode---------------------------------- |
366 // Load a Klass from an object | |
367 class LoadKlassNode : public LoadPNode { | |
368 public: | |
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369 LoadKlassNode( Node *c, Node *mem, Node *adr, const TypePtr *at, const TypeKlassPtr *tk ) |
0 | 370 : LoadPNode(c,mem,adr,at,tk) {} |
371 virtual int Opcode() const; | |
372 virtual const Type *Value( PhaseTransform *phase ) const; | |
373 virtual Node *Identity( PhaseTransform *phase ); | |
374 virtual bool depends_only_on_test() const { return true; } | |
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375 |
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376 // Polymorphic factory method: |
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377 static Node* make( PhaseGVN& gvn, Node *mem, Node *adr, const TypePtr* at, |
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378 const TypeKlassPtr *tk = TypeKlassPtr::OBJECT ); |
0 | 379 }; |
380 | |
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381 //------------------------------LoadNKlassNode--------------------------------- |
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382 // Load a narrow Klass from an object. |
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383 class LoadNKlassNode : public LoadNNode { |
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384 public: |
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385 LoadNKlassNode( Node *c, Node *mem, Node *adr, const TypePtr *at, const TypeNarrowOop *tk ) |
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386 : LoadNNode(c,mem,adr,at,tk) {} |
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387 virtual int Opcode() const; |
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388 virtual uint ideal_reg() const { return Op_RegN; } |
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389 virtual int store_Opcode() const { return Op_StoreN; } |
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390 virtual BasicType memory_type() const { return T_NARROWOOP; } |
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391 |
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392 virtual const Type *Value( PhaseTransform *phase ) const; |
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393 virtual Node *Identity( PhaseTransform *phase ); |
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394 virtual bool depends_only_on_test() const { return true; } |
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395 }; |
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396 |
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397 |
0 | 398 //------------------------------LoadSNode-------------------------------------- |
399 // Load a short (16bits signed) from memory | |
400 class LoadSNode : public LoadNode { | |
401 public: | |
402 LoadSNode( Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeInt *ti = TypeInt::SHORT ) | |
403 : LoadNode(c,mem,adr,at,ti) {} | |
404 virtual int Opcode() const; | |
405 virtual uint ideal_reg() const { return Op_RegI; } | |
406 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
407 virtual int store_Opcode() const { return Op_StoreC; } | |
408 virtual BasicType memory_type() const { return T_SHORT; } | |
409 }; | |
410 | |
411 //------------------------------StoreNode-------------------------------------- | |
412 // Store value; requires Store, Address and Value | |
413 class StoreNode : public MemNode { | |
414 protected: | |
415 virtual uint cmp( const Node &n ) const; | |
416 virtual bool depends_only_on_test() const { return false; } | |
417 | |
418 Node *Ideal_masked_input (PhaseGVN *phase, uint mask); | |
419 Node *Ideal_sign_extended_input(PhaseGVN *phase, int num_bits); | |
420 | |
421 public: | |
422 StoreNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) | |
423 : MemNode(c,mem,adr,at,val) { | |
424 init_class_id(Class_Store); | |
425 } | |
426 StoreNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, Node *oop_store ) | |
427 : MemNode(c,mem,adr,at,val,oop_store) { | |
428 init_class_id(Class_Store); | |
429 } | |
430 | |
431 // Polymorphic factory method: | |
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432 static StoreNode* make( PhaseGVN& gvn, Node *c, Node *mem, Node *adr, |
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433 const TypePtr* at, Node *val, BasicType bt ); |
0 | 434 |
435 virtual uint hash() const; // Check the type | |
436 | |
437 // If the store is to Field memory and the pointer is non-null, we can | |
438 // zero out the control input. | |
439 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
440 | |
441 // Compute a new Type for this node. Basically we just do the pre-check, | |
442 // then call the virtual add() to set the type. | |
443 virtual const Type *Value( PhaseTransform *phase ) const; | |
444 | |
445 // Check for identity function on memory (Load then Store at same address) | |
446 virtual Node *Identity( PhaseTransform *phase ); | |
447 | |
448 // Do not match memory edge | |
449 virtual uint match_edge(uint idx) const; | |
450 | |
451 virtual const Type *bottom_type() const; // returns Type::MEMORY | |
452 | |
453 // Map a store opcode to its corresponding own opcode, trivially. | |
454 virtual int store_Opcode() const { return Opcode(); } | |
455 | |
456 // have all possible loads of the value stored been optimized away? | |
457 bool value_never_loaded(PhaseTransform *phase) const; | |
458 }; | |
459 | |
460 //------------------------------StoreBNode------------------------------------- | |
461 // Store byte to memory | |
462 class StoreBNode : public StoreNode { | |
463 public: | |
464 StoreBNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} | |
465 virtual int Opcode() const; | |
466 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
467 virtual BasicType memory_type() const { return T_BYTE; } | |
468 }; | |
469 | |
470 //------------------------------StoreCNode------------------------------------- | |
471 // Store char/short to memory | |
472 class StoreCNode : public StoreNode { | |
473 public: | |
474 StoreCNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} | |
475 virtual int Opcode() const; | |
476 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
477 virtual BasicType memory_type() const { return T_CHAR; } | |
478 }; | |
479 | |
480 //------------------------------StoreINode------------------------------------- | |
481 // Store int to memory | |
482 class StoreINode : public StoreNode { | |
483 public: | |
484 StoreINode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} | |
485 virtual int Opcode() const; | |
486 virtual BasicType memory_type() const { return T_INT; } | |
487 }; | |
488 | |
489 //------------------------------StoreLNode------------------------------------- | |
490 // Store long to memory | |
491 class StoreLNode : public StoreNode { | |
492 virtual uint hash() const { return StoreNode::hash() + _require_atomic_access; } | |
493 virtual uint cmp( const Node &n ) const { | |
494 return _require_atomic_access == ((StoreLNode&)n)._require_atomic_access | |
495 && StoreNode::cmp(n); | |
496 } | |
497 virtual uint size_of() const { return sizeof(*this); } | |
498 const bool _require_atomic_access; // is piecewise store forbidden? | |
499 | |
500 public: | |
501 StoreLNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, | |
502 bool require_atomic_access = false ) | |
503 : StoreNode(c,mem,adr,at,val) | |
504 , _require_atomic_access(require_atomic_access) | |
505 {} | |
506 virtual int Opcode() const; | |
507 virtual BasicType memory_type() const { return T_LONG; } | |
508 bool require_atomic_access() { return _require_atomic_access; } | |
509 static StoreLNode* make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val); | |
510 #ifndef PRODUCT | |
511 virtual void dump_spec(outputStream *st) const { | |
512 StoreNode::dump_spec(st); | |
513 if (_require_atomic_access) st->print(" Atomic!"); | |
514 } | |
515 #endif | |
516 }; | |
517 | |
518 //------------------------------StoreFNode------------------------------------- | |
519 // Store float to memory | |
520 class StoreFNode : public StoreNode { | |
521 public: | |
522 StoreFNode( 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_FLOAT; } | |
525 }; | |
526 | |
527 //------------------------------StoreDNode------------------------------------- | |
528 // Store double to memory | |
529 class StoreDNode : public StoreNode { | |
530 public: | |
531 StoreDNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} | |
532 virtual int Opcode() const; | |
533 virtual BasicType memory_type() const { return T_DOUBLE; } | |
534 }; | |
535 | |
536 //------------------------------StorePNode------------------------------------- | |
537 // Store pointer to memory | |
538 class StorePNode : public StoreNode { | |
539 public: | |
540 StorePNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} | |
541 virtual int Opcode() const; | |
542 virtual BasicType memory_type() const { return T_ADDRESS; } | |
543 }; | |
544 | |
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545 //------------------------------StoreNNode------------------------------------- |
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546 // Store narrow oop to memory |
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547 class StoreNNode : public StoreNode { |
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548 public: |
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549 StoreNNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val ) : StoreNode(c,mem,adr,at,val) {} |
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550 virtual int Opcode() const; |
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551 virtual BasicType memory_type() const { return T_NARROWOOP; } |
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552 }; |
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553 |
0 | 554 //------------------------------StoreCMNode----------------------------------- |
555 // Store card-mark byte to memory for CM | |
556 // The last StoreCM before a SafePoint must be preserved and occur after its "oop" store | |
557 // Preceeding equivalent StoreCMs may be eliminated. | |
558 class StoreCMNode : public StoreNode { | |
559 public: | |
560 StoreCMNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, Node *oop_store ) : StoreNode(c,mem,adr,at,val,oop_store) {} | |
561 virtual int Opcode() const; | |
562 virtual Node *Identity( PhaseTransform *phase ); | |
563 virtual const Type *Value( PhaseTransform *phase ) const; | |
564 virtual BasicType memory_type() const { return T_VOID; } // unspecific | |
565 }; | |
566 | |
567 //------------------------------LoadPLockedNode--------------------------------- | |
568 // Load-locked a pointer from memory (either object or array). | |
569 // On Sparc & Intel this is implemented as a normal pointer load. | |
570 // On PowerPC and friends it's a real load-locked. | |
571 class LoadPLockedNode : public LoadPNode { | |
572 public: | |
573 LoadPLockedNode( Node *c, Node *mem, Node *adr ) | |
574 : LoadPNode(c,mem,adr,TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM) {} | |
575 virtual int Opcode() const; | |
576 virtual int store_Opcode() const { return Op_StorePConditional; } | |
577 virtual bool depends_only_on_test() const { return true; } | |
578 }; | |
579 | |
580 //------------------------------LoadLLockedNode--------------------------------- | |
581 // Load-locked a pointer from memory (either object or array). | |
582 // On Sparc & Intel this is implemented as a normal long load. | |
583 class LoadLLockedNode : public LoadLNode { | |
584 public: | |
585 LoadLLockedNode( Node *c, Node *mem, Node *adr ) | |
586 : LoadLNode(c,mem,adr,TypeRawPtr::BOTTOM, TypeLong::LONG) {} | |
587 virtual int Opcode() const; | |
588 virtual int store_Opcode() const { return Op_StoreLConditional; } | |
589 }; | |
590 | |
591 //------------------------------SCMemProjNode--------------------------------------- | |
592 // This class defines a projection of the memory state of a store conditional node. | |
593 // These nodes return a value, but also update memory. | |
594 class SCMemProjNode : public ProjNode { | |
595 public: | |
596 enum {SCMEMPROJCON = (uint)-2}; | |
597 SCMemProjNode( Node *src) : ProjNode( src, SCMEMPROJCON) { } | |
598 virtual int Opcode() const; | |
599 virtual bool is_CFG() const { return false; } | |
600 virtual const Type *bottom_type() const {return Type::MEMORY;} | |
601 virtual const TypePtr *adr_type() const { return in(0)->in(MemNode::Memory)->adr_type();} | |
602 virtual uint ideal_reg() const { return 0;} // memory projections don't have a register | |
603 virtual const Type *Value( PhaseTransform *phase ) const; | |
604 #ifndef PRODUCT | |
605 virtual void dump_spec(outputStream *st) const {}; | |
606 #endif | |
607 }; | |
608 | |
609 //------------------------------LoadStoreNode--------------------------- | |
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610 // Note: is_Mem() method returns 'true' for this class. |
0 | 611 class LoadStoreNode : public Node { |
612 public: | |
613 enum { | |
614 ExpectedIn = MemNode::ValueIn+1 // One more input than MemNode | |
615 }; | |
616 LoadStoreNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex); | |
617 virtual bool depends_only_on_test() const { return false; } | |
618 virtual const Type *bottom_type() const { return TypeInt::BOOL; } | |
619 virtual uint ideal_reg() const { return Op_RegI; } | |
620 virtual uint match_edge(uint idx) const { return idx == MemNode::Address || idx == MemNode::ValueIn; } | |
621 }; | |
622 | |
623 //------------------------------StorePConditionalNode--------------------------- | |
624 // Conditionally store pointer to memory, if no change since prior | |
625 // load-locked. Sets flags for success or failure of the store. | |
626 class StorePConditionalNode : public LoadStoreNode { | |
627 public: | |
628 StorePConditionalNode( Node *c, Node *mem, Node *adr, Node *val, Node *ll ) : LoadStoreNode(c, mem, adr, val, ll) { } | |
629 virtual int Opcode() const; | |
630 // Produces flags | |
631 virtual uint ideal_reg() const { return Op_RegFlags; } | |
632 }; | |
633 | |
634 //------------------------------StoreLConditionalNode--------------------------- | |
635 // Conditionally store long to memory, if no change since prior | |
636 // load-locked. Sets flags for success or failure of the store. | |
637 class StoreLConditionalNode : public LoadStoreNode { | |
638 public: | |
639 StoreLConditionalNode( Node *c, Node *mem, Node *adr, Node *val, Node *ll ) : LoadStoreNode(c, mem, adr, val, ll) { } | |
640 virtual int Opcode() const; | |
641 }; | |
642 | |
643 | |
644 //------------------------------CompareAndSwapLNode--------------------------- | |
645 class CompareAndSwapLNode : public LoadStoreNode { | |
646 public: | |
647 CompareAndSwapLNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } | |
648 virtual int Opcode() const; | |
649 }; | |
650 | |
651 | |
652 //------------------------------CompareAndSwapINode--------------------------- | |
653 class CompareAndSwapINode : public LoadStoreNode { | |
654 public: | |
655 CompareAndSwapINode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } | |
656 virtual int Opcode() const; | |
657 }; | |
658 | |
659 | |
660 //------------------------------CompareAndSwapPNode--------------------------- | |
661 class CompareAndSwapPNode : public LoadStoreNode { | |
662 public: | |
663 CompareAndSwapPNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } | |
664 virtual int Opcode() const; | |
665 }; | |
666 | |
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667 //------------------------------CompareAndSwapNNode--------------------------- |
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668 class CompareAndSwapNNode : public LoadStoreNode { |
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669 public: |
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670 CompareAndSwapNNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } |
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671 virtual int Opcode() const; |
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672 }; |
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673 |
0 | 674 //------------------------------ClearArray------------------------------------- |
675 class ClearArrayNode: public Node { | |
676 public: | |
677 ClearArrayNode( Node *ctrl, Node *arymem, Node *word_cnt, Node *base ) : Node(ctrl,arymem,word_cnt,base) {} | |
678 virtual int Opcode() const; | |
679 virtual const Type *bottom_type() const { return Type::MEMORY; } | |
680 // ClearArray modifies array elements, and so affects only the | |
681 // array memory addressed by the bottom_type of its base address. | |
682 virtual const class TypePtr *adr_type() const; | |
683 virtual Node *Identity( PhaseTransform *phase ); | |
684 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
685 virtual uint match_edge(uint idx) const; | |
686 | |
687 // Clear the given area of an object or array. | |
688 // The start offset must always be aligned mod BytesPerInt. | |
689 // The end offset must always be aligned mod BytesPerLong. | |
690 // Return the new memory. | |
691 static Node* clear_memory(Node* control, Node* mem, Node* dest, | |
692 intptr_t start_offset, | |
693 intptr_t end_offset, | |
694 PhaseGVN* phase); | |
695 static Node* clear_memory(Node* control, Node* mem, Node* dest, | |
696 intptr_t start_offset, | |
697 Node* end_offset, | |
698 PhaseGVN* phase); | |
699 static Node* clear_memory(Node* control, Node* mem, Node* dest, | |
700 Node* start_offset, | |
701 Node* end_offset, | |
702 PhaseGVN* phase); | |
703 }; | |
704 | |
705 //------------------------------StrComp------------------------------------- | |
706 class StrCompNode: public Node { | |
707 public: | |
708 StrCompNode(Node *control, | |
709 Node* char_array_mem, | |
710 Node* value_mem, | |
711 Node* count_mem, | |
712 Node* offset_mem, | |
713 Node* s1, Node* s2): Node(control, | |
714 char_array_mem, | |
715 value_mem, | |
716 count_mem, | |
717 offset_mem, | |
718 s1, s2) {}; | |
719 virtual int Opcode() const; | |
720 virtual bool depends_only_on_test() const { return false; } | |
721 virtual const Type* bottom_type() const { return TypeInt::INT; } | |
722 // a StrCompNode (conservatively) aliases with everything: | |
723 virtual const TypePtr* adr_type() const { return TypePtr::BOTTOM; } | |
724 virtual uint match_edge(uint idx) const; | |
725 virtual uint ideal_reg() const { return Op_RegI; } | |
726 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
727 }; | |
728 | |
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729 //------------------------------AryEq--------------------------------------- |
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730 class AryEqNode: public Node { |
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731 public: |
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732 AryEqNode(Node *control, Node* s1, Node* s2): Node(control, s1, s2) {}; |
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733 virtual int Opcode() const; |
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734 virtual bool depends_only_on_test() const { return false; } |
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735 virtual const Type* bottom_type() const { return TypeInt::BOOL; } |
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736 virtual const TypePtr* adr_type() const { return TypeAryPtr::CHARS; } |
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737 virtual uint ideal_reg() const { return Op_RegI; } |
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738 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); |
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739 }; |
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740 |
0 | 741 //------------------------------MemBar----------------------------------------- |
742 // There are different flavors of Memory Barriers to match the Java Memory | |
743 // Model. Monitor-enter and volatile-load act as Aquires: no following ref | |
744 // can be moved to before them. We insert a MemBar-Acquire after a FastLock or | |
745 // volatile-load. Monitor-exit and volatile-store act as Release: no | |
746 // preceeding ref can be moved to after them. We insert a MemBar-Release | |
747 // before a FastUnlock or volatile-store. All volatiles need to be | |
748 // serialized, so we follow all volatile-stores with a MemBar-Volatile to | |
749 // seperate it from any following volatile-load. | |
750 class MemBarNode: public MultiNode { | |
751 virtual uint hash() const ; // { return NO_HASH; } | |
752 virtual uint cmp( const Node &n ) const ; // Always fail, except on self | |
753 | |
754 virtual uint size_of() const { return sizeof(*this); } | |
755 // Memory type this node is serializing. Usually either rawptr or bottom. | |
756 const TypePtr* _adr_type; | |
757 | |
758 public: | |
759 enum { | |
760 Precedent = TypeFunc::Parms // optional edge to force precedence | |
761 }; | |
762 MemBarNode(Compile* C, int alias_idx, Node* precedent); | |
763 virtual int Opcode() const = 0; | |
764 virtual const class TypePtr *adr_type() const { return _adr_type; } | |
765 virtual const Type *Value( PhaseTransform *phase ) const; | |
766 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
767 virtual uint match_edge(uint idx) const { return 0; } | |
768 virtual const Type *bottom_type() const { return TypeTuple::MEMBAR; } | |
769 virtual Node *match( const ProjNode *proj, const Matcher *m ); | |
770 // Factory method. Builds a wide or narrow membar. | |
771 // Optional 'precedent' becomes an extra edge if not null. | |
772 static MemBarNode* make(Compile* C, int opcode, | |
773 int alias_idx = Compile::AliasIdxBot, | |
774 Node* precedent = NULL); | |
775 }; | |
776 | |
777 // "Acquire" - no following ref can move before (but earlier refs can | |
778 // follow, like an early Load stalled in cache). Requires multi-cpu | |
779 // visibility. Inserted after a volatile load or FastLock. | |
780 class MemBarAcquireNode: public MemBarNode { | |
781 public: | |
782 MemBarAcquireNode(Compile* C, int alias_idx, Node* precedent) | |
783 : MemBarNode(C, alias_idx, precedent) {} | |
784 virtual int Opcode() const; | |
785 }; | |
786 | |
787 // "Release" - no earlier ref can move after (but later refs can move | |
788 // up, like a speculative pipelined cache-hitting Load). Requires | |
789 // multi-cpu visibility. Inserted before a volatile store or FastUnLock. | |
790 class MemBarReleaseNode: public MemBarNode { | |
791 public: | |
792 MemBarReleaseNode(Compile* C, int alias_idx, Node* precedent) | |
793 : MemBarNode(C, alias_idx, precedent) {} | |
794 virtual int Opcode() const; | |
795 }; | |
796 | |
797 // Ordering between a volatile store and a following volatile load. | |
798 // Requires multi-CPU visibility? | |
799 class MemBarVolatileNode: public MemBarNode { | |
800 public: | |
801 MemBarVolatileNode(Compile* C, int alias_idx, Node* precedent) | |
802 : MemBarNode(C, alias_idx, precedent) {} | |
803 virtual int Opcode() const; | |
804 }; | |
805 | |
806 // Ordering within the same CPU. Used to order unsafe memory references | |
807 // inside the compiler when we lack alias info. Not needed "outside" the | |
808 // compiler because the CPU does all the ordering for us. | |
809 class MemBarCPUOrderNode: public MemBarNode { | |
810 public: | |
811 MemBarCPUOrderNode(Compile* C, int alias_idx, Node* precedent) | |
812 : MemBarNode(C, alias_idx, precedent) {} | |
813 virtual int Opcode() const; | |
814 virtual uint ideal_reg() const { return 0; } // not matched in the AD file | |
815 }; | |
816 | |
817 // Isolation of object setup after an AllocateNode and before next safepoint. | |
818 // (See comment in memnode.cpp near InitializeNode::InitializeNode for semantics.) | |
819 class InitializeNode: public MemBarNode { | |
820 friend class AllocateNode; | |
821 | |
822 bool _is_complete; | |
823 | |
824 public: | |
825 enum { | |
826 Control = TypeFunc::Control, | |
827 Memory = TypeFunc::Memory, // MergeMem for states affected by this op | |
828 RawAddress = TypeFunc::Parms+0, // the newly-allocated raw address | |
829 RawStores = TypeFunc::Parms+1 // zero or more stores (or TOP) | |
830 }; | |
831 | |
832 InitializeNode(Compile* C, int adr_type, Node* rawoop); | |
833 virtual int Opcode() const; | |
834 virtual uint size_of() const { return sizeof(*this); } | |
835 virtual uint ideal_reg() const { return 0; } // not matched in the AD file | |
836 virtual const RegMask &in_RegMask(uint) const; // mask for RawAddress | |
837 | |
838 // Manage incoming memory edges via a MergeMem on in(Memory): | |
839 Node* memory(uint alias_idx); | |
840 | |
841 // The raw memory edge coming directly from the Allocation. | |
842 // The contents of this memory are *always* all-zero-bits. | |
843 Node* zero_memory() { return memory(Compile::AliasIdxRaw); } | |
844 | |
845 // Return the corresponding allocation for this initialization (or null if none). | |
846 // (Note: Both InitializeNode::allocation and AllocateNode::initialization | |
847 // are defined in graphKit.cpp, which sets up the bidirectional relation.) | |
848 AllocateNode* allocation(); | |
849 | |
850 // Anything other than zeroing in this init? | |
851 bool is_non_zero(); | |
852 | |
853 // An InitializeNode must completed before macro expansion is done. | |
854 // Completion requires that the AllocateNode must be followed by | |
855 // initialization of the new memory to zero, then to any initializers. | |
856 bool is_complete() { return _is_complete; } | |
857 | |
858 // Mark complete. (Must not yet be complete.) | |
859 void set_complete(PhaseGVN* phase); | |
860 | |
861 #ifdef ASSERT | |
862 // ensure all non-degenerate stores are ordered and non-overlapping | |
863 bool stores_are_sane(PhaseTransform* phase); | |
864 #endif //ASSERT | |
865 | |
866 // See if this store can be captured; return offset where it initializes. | |
867 // Return 0 if the store cannot be moved (any sort of problem). | |
868 intptr_t can_capture_store(StoreNode* st, PhaseTransform* phase); | |
869 | |
870 // Capture another store; reformat it to write my internal raw memory. | |
871 // Return the captured copy, else NULL if there is some sort of problem. | |
872 Node* capture_store(StoreNode* st, intptr_t start, PhaseTransform* phase); | |
873 | |
874 // Find captured store which corresponds to the range [start..start+size). | |
875 // Return my own memory projection (meaning the initial zero bits) | |
876 // if there is no such store. Return NULL if there is a problem. | |
877 Node* find_captured_store(intptr_t start, int size_in_bytes, PhaseTransform* phase); | |
878 | |
879 // Called when the associated AllocateNode is expanded into CFG. | |
880 Node* complete_stores(Node* rawctl, Node* rawmem, Node* rawptr, | |
881 intptr_t header_size, Node* size_in_bytes, | |
882 PhaseGVN* phase); | |
883 | |
884 private: | |
885 void remove_extra_zeroes(); | |
886 | |
887 // Find out where a captured store should be placed (or already is placed). | |
888 int captured_store_insertion_point(intptr_t start, int size_in_bytes, | |
889 PhaseTransform* phase); | |
890 | |
891 static intptr_t get_store_offset(Node* st, PhaseTransform* phase); | |
892 | |
893 Node* make_raw_address(intptr_t offset, PhaseTransform* phase); | |
894 | |
895 bool detect_init_independence(Node* n, bool st_is_pinned, int& count); | |
896 | |
897 void coalesce_subword_stores(intptr_t header_size, Node* size_in_bytes, | |
898 PhaseGVN* phase); | |
899 | |
900 intptr_t find_next_fullword_store(uint i, PhaseGVN* phase); | |
901 }; | |
902 | |
903 //------------------------------MergeMem--------------------------------------- | |
904 // (See comment in memnode.cpp near MergeMemNode::MergeMemNode for semantics.) | |
905 class MergeMemNode: public Node { | |
906 virtual uint hash() const ; // { return NO_HASH; } | |
907 virtual uint cmp( const Node &n ) const ; // Always fail, except on self | |
908 friend class MergeMemStream; | |
909 MergeMemNode(Node* def); // clients use MergeMemNode::make | |
910 | |
911 public: | |
912 // If the input is a whole memory state, clone it with all its slices intact. | |
913 // Otherwise, make a new memory state with just that base memory input. | |
914 // In either case, the result is a newly created MergeMem. | |
915 static MergeMemNode* make(Compile* C, Node* base_memory); | |
916 | |
917 virtual int Opcode() const; | |
918 virtual Node *Identity( PhaseTransform *phase ); | |
919 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
920 virtual uint ideal_reg() const { return NotAMachineReg; } | |
921 virtual uint match_edge(uint idx) const { return 0; } | |
922 virtual const RegMask &out_RegMask() const; | |
923 virtual const Type *bottom_type() const { return Type::MEMORY; } | |
924 virtual const TypePtr *adr_type() const { return TypePtr::BOTTOM; } | |
925 // sparse accessors | |
926 // Fetch the previously stored "set_memory_at", or else the base memory. | |
927 // (Caller should clone it if it is a phi-nest.) | |
928 Node* memory_at(uint alias_idx) const; | |
929 // set the memory, regardless of its previous value | |
930 void set_memory_at(uint alias_idx, Node* n); | |
931 // the "base" is the memory that provides the non-finite support | |
932 Node* base_memory() const { return in(Compile::AliasIdxBot); } | |
933 // warning: setting the base can implicitly set any of the other slices too | |
934 void set_base_memory(Node* def); | |
935 // sentinel value which denotes a copy of the base memory: | |
936 Node* empty_memory() const { return in(Compile::AliasIdxTop); } | |
937 static Node* make_empty_memory(); // where the sentinel comes from | |
938 bool is_empty_memory(Node* n) const { assert((n == empty_memory()) == n->is_top(), "sanity"); return n->is_top(); } | |
939 // hook for the iterator, to perform any necessary setup | |
940 void iteration_setup(const MergeMemNode* other = NULL); | |
941 // push sentinels until I am at least as long as the other (semantic no-op) | |
942 void grow_to_match(const MergeMemNode* other); | |
943 bool verify_sparse() const PRODUCT_RETURN0; | |
944 #ifndef PRODUCT | |
945 virtual void dump_spec(outputStream *st) const; | |
946 #endif | |
947 }; | |
948 | |
949 class MergeMemStream : public StackObj { | |
950 private: | |
951 MergeMemNode* _mm; | |
952 const MergeMemNode* _mm2; // optional second guy, contributes non-empty iterations | |
953 Node* _mm_base; // loop-invariant base memory of _mm | |
954 int _idx; | |
955 int _cnt; | |
956 Node* _mem; | |
957 Node* _mem2; | |
958 int _cnt2; | |
959 | |
960 void init(MergeMemNode* mm, const MergeMemNode* mm2 = NULL) { | |
961 // subsume_node will break sparseness at times, whenever a memory slice | |
962 // folds down to a copy of the base ("fat") memory. In such a case, | |
963 // the raw edge will update to base, although it should be top. | |
964 // This iterator will recognize either top or base_memory as an | |
965 // "empty" slice. See is_empty, is_empty2, and next below. | |
966 // | |
967 // The sparseness property is repaired in MergeMemNode::Ideal. | |
968 // As long as access to a MergeMem goes through this iterator | |
969 // or the memory_at accessor, flaws in the sparseness will | |
970 // never be observed. | |
971 // | |
972 // Also, iteration_setup repairs sparseness. | |
973 assert(mm->verify_sparse(), "please, no dups of base"); | |
974 assert(mm2==NULL || mm2->verify_sparse(), "please, no dups of base"); | |
975 | |
976 _mm = mm; | |
977 _mm_base = mm->base_memory(); | |
978 _mm2 = mm2; | |
979 _cnt = mm->req(); | |
980 _idx = Compile::AliasIdxBot-1; // start at the base memory | |
981 _mem = NULL; | |
982 _mem2 = NULL; | |
983 } | |
984 | |
985 #ifdef ASSERT | |
986 Node* check_memory() const { | |
987 if (at_base_memory()) | |
988 return _mm->base_memory(); | |
989 else if ((uint)_idx < _mm->req() && !_mm->in(_idx)->is_top()) | |
990 return _mm->memory_at(_idx); | |
991 else | |
992 return _mm_base; | |
993 } | |
994 Node* check_memory2() const { | |
995 return at_base_memory()? _mm2->base_memory(): _mm2->memory_at(_idx); | |
996 } | |
997 #endif | |
998 | |
999 static bool match_memory(Node* mem, const MergeMemNode* mm, int idx) PRODUCT_RETURN0; | |
1000 void assert_synch() const { | |
1001 assert(!_mem || _idx >= _cnt || match_memory(_mem, _mm, _idx), | |
1002 "no side-effects except through the stream"); | |
1003 } | |
1004 | |
1005 public: | |
1006 | |
1007 // expected usages: | |
1008 // for (MergeMemStream mms(mem->is_MergeMem()); next_non_empty(); ) { ... } | |
1009 // for (MergeMemStream mms(mem1, mem2); next_non_empty2(); ) { ... } | |
1010 | |
1011 // iterate over one merge | |
1012 MergeMemStream(MergeMemNode* mm) { | |
1013 mm->iteration_setup(); | |
1014 init(mm); | |
1015 debug_only(_cnt2 = 999); | |
1016 } | |
1017 // iterate in parallel over two merges | |
1018 // only iterates through non-empty elements of mm2 | |
1019 MergeMemStream(MergeMemNode* mm, const MergeMemNode* mm2) { | |
1020 assert(mm2, "second argument must be a MergeMem also"); | |
1021 ((MergeMemNode*)mm2)->iteration_setup(); // update hidden state | |
1022 mm->iteration_setup(mm2); | |
1023 init(mm, mm2); | |
1024 _cnt2 = mm2->req(); | |
1025 } | |
1026 #ifdef ASSERT | |
1027 ~MergeMemStream() { | |
1028 assert_synch(); | |
1029 } | |
1030 #endif | |
1031 | |
1032 MergeMemNode* all_memory() const { | |
1033 return _mm; | |
1034 } | |
1035 Node* base_memory() const { | |
1036 assert(_mm_base == _mm->base_memory(), "no update to base memory, please"); | |
1037 return _mm_base; | |
1038 } | |
1039 const MergeMemNode* all_memory2() const { | |
1040 assert(_mm2 != NULL, ""); | |
1041 return _mm2; | |
1042 } | |
1043 bool at_base_memory() const { | |
1044 return _idx == Compile::AliasIdxBot; | |
1045 } | |
1046 int alias_idx() const { | |
1047 assert(_mem, "must call next 1st"); | |
1048 return _idx; | |
1049 } | |
1050 | |
1051 const TypePtr* adr_type() const { | |
1052 return Compile::current()->get_adr_type(alias_idx()); | |
1053 } | |
1054 | |
1055 const TypePtr* adr_type(Compile* C) const { | |
1056 return C->get_adr_type(alias_idx()); | |
1057 } | |
1058 bool is_empty() const { | |
1059 assert(_mem, "must call next 1st"); | |
1060 assert(_mem->is_top() == (_mem==_mm->empty_memory()), "correct sentinel"); | |
1061 return _mem->is_top(); | |
1062 } | |
1063 bool is_empty2() const { | |
1064 assert(_mem2, "must call next 1st"); | |
1065 assert(_mem2->is_top() == (_mem2==_mm2->empty_memory()), "correct sentinel"); | |
1066 return _mem2->is_top(); | |
1067 } | |
1068 Node* memory() const { | |
1069 assert(!is_empty(), "must not be empty"); | |
1070 assert_synch(); | |
1071 return _mem; | |
1072 } | |
1073 // get the current memory, regardless of empty or non-empty status | |
1074 Node* force_memory() const { | |
1075 assert(!is_empty() || !at_base_memory(), ""); | |
1076 // Use _mm_base to defend against updates to _mem->base_memory(). | |
1077 Node *mem = _mem->is_top() ? _mm_base : _mem; | |
1078 assert(mem == check_memory(), ""); | |
1079 return mem; | |
1080 } | |
1081 Node* memory2() const { | |
1082 assert(_mem2 == check_memory2(), ""); | |
1083 return _mem2; | |
1084 } | |
1085 void set_memory(Node* mem) { | |
1086 if (at_base_memory()) { | |
1087 // Note that this does not change the invariant _mm_base. | |
1088 _mm->set_base_memory(mem); | |
1089 } else { | |
1090 _mm->set_memory_at(_idx, mem); | |
1091 } | |
1092 _mem = mem; | |
1093 assert_synch(); | |
1094 } | |
1095 | |
1096 // Recover from a side effect to the MergeMemNode. | |
1097 void set_memory() { | |
1098 _mem = _mm->in(_idx); | |
1099 } | |
1100 | |
1101 bool next() { return next(false); } | |
1102 bool next2() { return next(true); } | |
1103 | |
1104 bool next_non_empty() { return next_non_empty(false); } | |
1105 bool next_non_empty2() { return next_non_empty(true); } | |
1106 // next_non_empty2 can yield states where is_empty() is true | |
1107 | |
1108 private: | |
1109 // find the next item, which might be empty | |
1110 bool next(bool have_mm2) { | |
1111 assert((_mm2 != NULL) == have_mm2, "use other next"); | |
1112 assert_synch(); | |
1113 if (++_idx < _cnt) { | |
1114 // Note: This iterator allows _mm to be non-sparse. | |
1115 // It behaves the same whether _mem is top or base_memory. | |
1116 _mem = _mm->in(_idx); | |
1117 if (have_mm2) | |
1118 _mem2 = _mm2->in((_idx < _cnt2) ? _idx : Compile::AliasIdxTop); | |
1119 return true; | |
1120 } | |
1121 return false; | |
1122 } | |
1123 | |
1124 // find the next non-empty item | |
1125 bool next_non_empty(bool have_mm2) { | |
1126 while (next(have_mm2)) { | |
1127 if (!is_empty()) { | |
1128 // make sure _mem2 is filled in sensibly | |
1129 if (have_mm2 && _mem2->is_top()) _mem2 = _mm2->base_memory(); | |
1130 return true; | |
1131 } else if (have_mm2 && !is_empty2()) { | |
1132 return true; // is_empty() == true | |
1133 } | |
1134 } | |
1135 return false; | |
1136 } | |
1137 }; | |
1138 | |
1139 //------------------------------Prefetch--------------------------------------- | |
1140 | |
1141 // Non-faulting prefetch load. Prefetch for many reads. | |
1142 class PrefetchReadNode : public Node { | |
1143 public: | |
1144 PrefetchReadNode(Node *abio, Node *adr) : Node(0,abio,adr) {} | |
1145 virtual int Opcode() const; | |
1146 virtual uint ideal_reg() const { return NotAMachineReg; } | |
1147 virtual uint match_edge(uint idx) const { return idx==2; } | |
1148 virtual const Type *bottom_type() const { return Type::ABIO; } | |
1149 }; | |
1150 | |
1151 // Non-faulting prefetch load. Prefetch for many reads & many writes. | |
1152 class PrefetchWriteNode : public Node { | |
1153 public: | |
1154 PrefetchWriteNode(Node *abio, Node *adr) : Node(0,abio,adr) {} | |
1155 virtual int Opcode() const; | |
1156 virtual uint ideal_reg() const { return NotAMachineReg; } | |
1157 virtual uint match_edge(uint idx) const { return idx==2; } | |
1158 virtual const Type *bottom_type() const { return Type::ABIO; } | |
1159 }; |