Mercurial > hg > truffle
annotate src/share/vm/opto/memnode.hpp @ 756:cecd04fc6f93
6837011: SIGSEGV in PhaseIdealLoop in 32bit jvm
Summary: The CR's test crashes with SIGSEGV when running with "-server -Xcomp" using using 32bit jvm.
Reviewed-by: kvn, never, rasbold
author | twisti |
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date | Wed, 06 May 2009 12:04:42 -0700 |
parents | fbde8ec322d0 |
children | 685e959d09ea |
rev | line source |
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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 | |
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 | |
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: | |
164
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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; } | |
164
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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 | |
164
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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 { | |
585 public: | |
586 StoreCMNode( Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, Node *oop_store ) : StoreNode(c,mem,adr,at,val,oop_store) {} | |
587 virtual int Opcode() const; | |
588 virtual Node *Identity( PhaseTransform *phase ); | |
589 virtual const Type *Value( PhaseTransform *phase ) const; | |
590 virtual BasicType memory_type() const { return T_VOID; } // unspecific | |
591 }; | |
592 | |
593 //------------------------------LoadPLockedNode--------------------------------- | |
594 // Load-locked a pointer from memory (either object or array). | |
595 // On Sparc & Intel this is implemented as a normal pointer load. | |
596 // On PowerPC and friends it's a real load-locked. | |
597 class LoadPLockedNode : public LoadPNode { | |
598 public: | |
599 LoadPLockedNode( Node *c, Node *mem, Node *adr ) | |
600 : LoadPNode(c,mem,adr,TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM) {} | |
601 virtual int Opcode() const; | |
602 virtual int store_Opcode() const { return Op_StorePConditional; } | |
603 virtual bool depends_only_on_test() const { return true; } | |
604 }; | |
605 | |
606 //------------------------------LoadLLockedNode--------------------------------- | |
607 // Load-locked a pointer from memory (either object or array). | |
608 // On Sparc & Intel this is implemented as a normal long load. | |
609 class LoadLLockedNode : public LoadLNode { | |
610 public: | |
611 LoadLLockedNode( Node *c, Node *mem, Node *adr ) | |
612 : LoadLNode(c,mem,adr,TypeRawPtr::BOTTOM, TypeLong::LONG) {} | |
613 virtual int Opcode() const; | |
614 virtual int store_Opcode() const { return Op_StoreLConditional; } | |
615 }; | |
616 | |
617 //------------------------------SCMemProjNode--------------------------------------- | |
618 // This class defines a projection of the memory state of a store conditional node. | |
619 // These nodes return a value, but also update memory. | |
620 class SCMemProjNode : public ProjNode { | |
621 public: | |
622 enum {SCMEMPROJCON = (uint)-2}; | |
623 SCMemProjNode( Node *src) : ProjNode( src, SCMEMPROJCON) { } | |
624 virtual int Opcode() const; | |
625 virtual bool is_CFG() const { return false; } | |
626 virtual const Type *bottom_type() const {return Type::MEMORY;} | |
627 virtual const TypePtr *adr_type() const { return in(0)->in(MemNode::Memory)->adr_type();} | |
628 virtual uint ideal_reg() const { return 0;} // memory projections don't have a register | |
629 virtual const Type *Value( PhaseTransform *phase ) const; | |
630 #ifndef PRODUCT | |
631 virtual void dump_spec(outputStream *st) const {}; | |
632 #endif | |
633 }; | |
634 | |
635 //------------------------------LoadStoreNode--------------------------- | |
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636 // Note: is_Mem() method returns 'true' for this class. |
0 | 637 class LoadStoreNode : public Node { |
638 public: | |
639 enum { | |
640 ExpectedIn = MemNode::ValueIn+1 // One more input than MemNode | |
641 }; | |
642 LoadStoreNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex); | |
643 virtual bool depends_only_on_test() const { return false; } | |
644 virtual const Type *bottom_type() const { return TypeInt::BOOL; } | |
645 virtual uint ideal_reg() const { return Op_RegI; } | |
646 virtual uint match_edge(uint idx) const { return idx == MemNode::Address || idx == MemNode::ValueIn; } | |
647 }; | |
648 | |
649 //------------------------------StorePConditionalNode--------------------------- | |
650 // Conditionally store pointer to memory, if no change since prior | |
651 // load-locked. Sets flags for success or failure of the store. | |
652 class StorePConditionalNode : public LoadStoreNode { | |
653 public: | |
654 StorePConditionalNode( Node *c, Node *mem, Node *adr, Node *val, Node *ll ) : LoadStoreNode(c, mem, adr, val, ll) { } | |
655 virtual int Opcode() const; | |
656 // Produces flags | |
657 virtual uint ideal_reg() const { return Op_RegFlags; } | |
658 }; | |
659 | |
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660 //------------------------------StoreIConditionalNode--------------------------- |
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661 // Conditionally store int to memory, if no change since prior |
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662 // load-locked. Sets flags for success or failure of the store. |
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663 class StoreIConditionalNode : public LoadStoreNode { |
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664 public: |
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665 StoreIConditionalNode( Node *c, Node *mem, Node *adr, Node *val, Node *ii ) : LoadStoreNode(c, mem, adr, val, ii) { } |
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666 virtual int Opcode() const; |
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667 // Produces flags |
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668 virtual uint ideal_reg() const { return Op_RegFlags; } |
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669 }; |
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670 |
0 | 671 //------------------------------StoreLConditionalNode--------------------------- |
672 // Conditionally store long to memory, if no change since prior | |
673 // load-locked. Sets flags for success or failure of the store. | |
674 class StoreLConditionalNode : public LoadStoreNode { | |
675 public: | |
676 StoreLConditionalNode( Node *c, Node *mem, Node *adr, Node *val, Node *ll ) : LoadStoreNode(c, mem, adr, val, ll) { } | |
677 virtual int Opcode() const; | |
420
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678 // Produces flags |
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679 virtual uint ideal_reg() const { return Op_RegFlags; } |
0 | 680 }; |
681 | |
682 | |
683 //------------------------------CompareAndSwapLNode--------------------------- | |
684 class CompareAndSwapLNode : public LoadStoreNode { | |
685 public: | |
686 CompareAndSwapLNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } | |
687 virtual int Opcode() const; | |
688 }; | |
689 | |
690 | |
691 //------------------------------CompareAndSwapINode--------------------------- | |
692 class CompareAndSwapINode : public LoadStoreNode { | |
693 public: | |
694 CompareAndSwapINode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } | |
695 virtual int Opcode() const; | |
696 }; | |
697 | |
698 | |
699 //------------------------------CompareAndSwapPNode--------------------------- | |
700 class CompareAndSwapPNode : public LoadStoreNode { | |
701 public: | |
702 CompareAndSwapPNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } | |
703 virtual int Opcode() const; | |
704 }; | |
705 | |
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706 //------------------------------CompareAndSwapNNode--------------------------- |
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707 class CompareAndSwapNNode : public LoadStoreNode { |
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708 public: |
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709 CompareAndSwapNNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex) : LoadStoreNode(c, mem, adr, val, ex) { } |
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710 virtual int Opcode() const; |
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711 }; |
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712 |
0 | 713 //------------------------------ClearArray------------------------------------- |
714 class ClearArrayNode: public Node { | |
715 public: | |
716 ClearArrayNode( Node *ctrl, Node *arymem, Node *word_cnt, Node *base ) : Node(ctrl,arymem,word_cnt,base) {} | |
717 virtual int Opcode() const; | |
718 virtual const Type *bottom_type() const { return Type::MEMORY; } | |
719 // ClearArray modifies array elements, and so affects only the | |
720 // array memory addressed by the bottom_type of its base address. | |
721 virtual const class TypePtr *adr_type() const; | |
722 virtual Node *Identity( PhaseTransform *phase ); | |
723 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
724 virtual uint match_edge(uint idx) const; | |
725 | |
726 // Clear the given area of an object or array. | |
727 // The start offset must always be aligned mod BytesPerInt. | |
728 // The end offset must always be aligned mod BytesPerLong. | |
729 // Return the new memory. | |
730 static Node* clear_memory(Node* control, Node* mem, Node* dest, | |
731 intptr_t start_offset, | |
732 intptr_t end_offset, | |
733 PhaseGVN* phase); | |
734 static Node* clear_memory(Node* control, Node* mem, Node* dest, | |
735 intptr_t start_offset, | |
736 Node* end_offset, | |
737 PhaseGVN* phase); | |
738 static Node* clear_memory(Node* control, Node* mem, Node* dest, | |
739 Node* start_offset, | |
740 Node* end_offset, | |
741 PhaseGVN* phase); | |
742 }; | |
743 | |
744 //------------------------------StrComp------------------------------------- | |
745 class StrCompNode: public Node { | |
746 public: | |
747 StrCompNode(Node *control, | |
748 Node* char_array_mem, | |
749 Node* value_mem, | |
750 Node* count_mem, | |
751 Node* offset_mem, | |
752 Node* s1, Node* s2): Node(control, | |
753 char_array_mem, | |
754 value_mem, | |
755 count_mem, | |
756 offset_mem, | |
757 s1, s2) {}; | |
758 virtual int Opcode() const; | |
759 virtual bool depends_only_on_test() const { return false; } | |
760 virtual const Type* bottom_type() const { return TypeInt::INT; } | |
761 // a StrCompNode (conservatively) aliases with everything: | |
762 virtual const TypePtr* adr_type() const { return TypePtr::BOTTOM; } | |
763 virtual uint match_edge(uint idx) const; | |
764 virtual uint ideal_reg() const { return Op_RegI; } | |
765 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
766 }; | |
767 | |
681 | 768 //------------------------------StrEquals------------------------------------- |
769 class StrEqualsNode: public Node { | |
770 public: | |
771 StrEqualsNode(Node *control, | |
772 Node* char_array_mem, | |
773 Node* value_mem, | |
774 Node* count_mem, | |
775 Node* offset_mem, | |
776 Node* s1, Node* s2): Node(control, | |
777 char_array_mem, | |
778 value_mem, | |
779 count_mem, | |
780 offset_mem, | |
781 s1, s2) {}; | |
782 virtual int Opcode() const; | |
783 virtual bool depends_only_on_test() const { return false; } | |
784 virtual const Type* bottom_type() const { return TypeInt::BOOL; } | |
785 // a StrEqualsNode (conservatively) aliases with everything: | |
786 virtual const TypePtr* adr_type() const { return TypePtr::BOTTOM; } | |
787 virtual uint match_edge(uint idx) const; | |
788 virtual uint ideal_reg() const { return Op_RegI; } | |
789 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
790 }; | |
791 | |
792 //------------------------------StrIndexOf------------------------------------- | |
793 class StrIndexOfNode: public Node { | |
794 public: | |
795 StrIndexOfNode(Node *control, | |
796 Node* char_array_mem, | |
797 Node* value_mem, | |
798 Node* count_mem, | |
799 Node* offset_mem, | |
800 Node* s1, Node* s2): Node(control, | |
801 char_array_mem, | |
802 value_mem, | |
803 count_mem, | |
804 offset_mem, | |
805 s1, s2) {}; | |
806 virtual int Opcode() const; | |
807 virtual bool depends_only_on_test() const { return false; } | |
808 virtual const Type* bottom_type() const { return TypeInt::INT; } | |
809 // a StrIndexOfNode (conservatively) aliases with everything: | |
810 virtual const TypePtr* adr_type() const { return TypePtr::BOTTOM; } | |
811 virtual uint match_edge(uint idx) const; | |
812 virtual uint ideal_reg() const { return Op_RegI; } | |
813 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
814 }; | |
815 | |
169
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816 //------------------------------AryEq--------------------------------------- |
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817 class AryEqNode: public Node { |
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818 public: |
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819 AryEqNode(Node *control, Node* s1, Node* s2): Node(control, s1, s2) {}; |
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820 virtual int Opcode() const; |
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821 virtual bool depends_only_on_test() const { return false; } |
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822 virtual const Type* bottom_type() const { return TypeInt::BOOL; } |
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823 virtual const TypePtr* adr_type() const { return TypeAryPtr::CHARS; } |
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824 virtual uint ideal_reg() const { return Op_RegI; } |
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825 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); |
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826 }; |
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827 |
0 | 828 //------------------------------MemBar----------------------------------------- |
829 // There are different flavors of Memory Barriers to match the Java Memory | |
830 // Model. Monitor-enter and volatile-load act as Aquires: no following ref | |
831 // can be moved to before them. We insert a MemBar-Acquire after a FastLock or | |
832 // volatile-load. Monitor-exit and volatile-store act as Release: no | |
605 | 833 // preceding ref can be moved to after them. We insert a MemBar-Release |
0 | 834 // before a FastUnlock or volatile-store. All volatiles need to be |
835 // serialized, so we follow all volatile-stores with a MemBar-Volatile to | |
605 | 836 // separate it from any following volatile-load. |
0 | 837 class MemBarNode: public MultiNode { |
838 virtual uint hash() const ; // { return NO_HASH; } | |
839 virtual uint cmp( const Node &n ) const ; // Always fail, except on self | |
840 | |
841 virtual uint size_of() const { return sizeof(*this); } | |
842 // Memory type this node is serializing. Usually either rawptr or bottom. | |
843 const TypePtr* _adr_type; | |
844 | |
845 public: | |
846 enum { | |
847 Precedent = TypeFunc::Parms // optional edge to force precedence | |
848 }; | |
849 MemBarNode(Compile* C, int alias_idx, Node* precedent); | |
850 virtual int Opcode() const = 0; | |
851 virtual const class TypePtr *adr_type() const { return _adr_type; } | |
852 virtual const Type *Value( PhaseTransform *phase ) const; | |
853 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
854 virtual uint match_edge(uint idx) const { return 0; } | |
855 virtual const Type *bottom_type() const { return TypeTuple::MEMBAR; } | |
856 virtual Node *match( const ProjNode *proj, const Matcher *m ); | |
857 // Factory method. Builds a wide or narrow membar. | |
858 // Optional 'precedent' becomes an extra edge if not null. | |
859 static MemBarNode* make(Compile* C, int opcode, | |
860 int alias_idx = Compile::AliasIdxBot, | |
861 Node* precedent = NULL); | |
862 }; | |
863 | |
864 // "Acquire" - no following ref can move before (but earlier refs can | |
865 // follow, like an early Load stalled in cache). Requires multi-cpu | |
866 // visibility. Inserted after a volatile load or FastLock. | |
867 class MemBarAcquireNode: public MemBarNode { | |
868 public: | |
869 MemBarAcquireNode(Compile* C, int alias_idx, Node* precedent) | |
870 : MemBarNode(C, alias_idx, precedent) {} | |
871 virtual int Opcode() const; | |
872 }; | |
873 | |
874 // "Release" - no earlier ref can move after (but later refs can move | |
875 // up, like a speculative pipelined cache-hitting Load). Requires | |
876 // multi-cpu visibility. Inserted before a volatile store or FastUnLock. | |
877 class MemBarReleaseNode: public MemBarNode { | |
878 public: | |
879 MemBarReleaseNode(Compile* C, int alias_idx, Node* precedent) | |
880 : MemBarNode(C, alias_idx, precedent) {} | |
881 virtual int Opcode() const; | |
882 }; | |
883 | |
884 // Ordering between a volatile store and a following volatile load. | |
885 // Requires multi-CPU visibility? | |
886 class MemBarVolatileNode: public MemBarNode { | |
887 public: | |
888 MemBarVolatileNode(Compile* C, int alias_idx, Node* precedent) | |
889 : MemBarNode(C, alias_idx, precedent) {} | |
890 virtual int Opcode() const; | |
891 }; | |
892 | |
893 // Ordering within the same CPU. Used to order unsafe memory references | |
894 // inside the compiler when we lack alias info. Not needed "outside" the | |
895 // compiler because the CPU does all the ordering for us. | |
896 class MemBarCPUOrderNode: public MemBarNode { | |
897 public: | |
898 MemBarCPUOrderNode(Compile* C, int alias_idx, Node* precedent) | |
899 : MemBarNode(C, alias_idx, precedent) {} | |
900 virtual int Opcode() const; | |
901 virtual uint ideal_reg() const { return 0; } // not matched in the AD file | |
902 }; | |
903 | |
904 // Isolation of object setup after an AllocateNode and before next safepoint. | |
905 // (See comment in memnode.cpp near InitializeNode::InitializeNode for semantics.) | |
906 class InitializeNode: public MemBarNode { | |
907 friend class AllocateNode; | |
908 | |
909 bool _is_complete; | |
910 | |
911 public: | |
912 enum { | |
913 Control = TypeFunc::Control, | |
914 Memory = TypeFunc::Memory, // MergeMem for states affected by this op | |
915 RawAddress = TypeFunc::Parms+0, // the newly-allocated raw address | |
916 RawStores = TypeFunc::Parms+1 // zero or more stores (or TOP) | |
917 }; | |
918 | |
919 InitializeNode(Compile* C, int adr_type, Node* rawoop); | |
920 virtual int Opcode() const; | |
921 virtual uint size_of() const { return sizeof(*this); } | |
922 virtual uint ideal_reg() const { return 0; } // not matched in the AD file | |
923 virtual const RegMask &in_RegMask(uint) const; // mask for RawAddress | |
924 | |
925 // Manage incoming memory edges via a MergeMem on in(Memory): | |
926 Node* memory(uint alias_idx); | |
927 | |
928 // The raw memory edge coming directly from the Allocation. | |
929 // The contents of this memory are *always* all-zero-bits. | |
930 Node* zero_memory() { return memory(Compile::AliasIdxRaw); } | |
931 | |
932 // Return the corresponding allocation for this initialization (or null if none). | |
933 // (Note: Both InitializeNode::allocation and AllocateNode::initialization | |
934 // are defined in graphKit.cpp, which sets up the bidirectional relation.) | |
935 AllocateNode* allocation(); | |
936 | |
937 // Anything other than zeroing in this init? | |
938 bool is_non_zero(); | |
939 | |
940 // An InitializeNode must completed before macro expansion is done. | |
941 // Completion requires that the AllocateNode must be followed by | |
942 // initialization of the new memory to zero, then to any initializers. | |
943 bool is_complete() { return _is_complete; } | |
944 | |
945 // Mark complete. (Must not yet be complete.) | |
946 void set_complete(PhaseGVN* phase); | |
947 | |
948 #ifdef ASSERT | |
949 // ensure all non-degenerate stores are ordered and non-overlapping | |
950 bool stores_are_sane(PhaseTransform* phase); | |
951 #endif //ASSERT | |
952 | |
953 // See if this store can be captured; return offset where it initializes. | |
954 // Return 0 if the store cannot be moved (any sort of problem). | |
955 intptr_t can_capture_store(StoreNode* st, PhaseTransform* phase); | |
956 | |
957 // Capture another store; reformat it to write my internal raw memory. | |
958 // Return the captured copy, else NULL if there is some sort of problem. | |
959 Node* capture_store(StoreNode* st, intptr_t start, PhaseTransform* phase); | |
960 | |
961 // Find captured store which corresponds to the range [start..start+size). | |
962 // Return my own memory projection (meaning the initial zero bits) | |
963 // if there is no such store. Return NULL if there is a problem. | |
964 Node* find_captured_store(intptr_t start, int size_in_bytes, PhaseTransform* phase); | |
965 | |
966 // Called when the associated AllocateNode is expanded into CFG. | |
967 Node* complete_stores(Node* rawctl, Node* rawmem, Node* rawptr, | |
968 intptr_t header_size, Node* size_in_bytes, | |
969 PhaseGVN* phase); | |
970 | |
971 private: | |
972 void remove_extra_zeroes(); | |
973 | |
974 // Find out where a captured store should be placed (or already is placed). | |
975 int captured_store_insertion_point(intptr_t start, int size_in_bytes, | |
976 PhaseTransform* phase); | |
977 | |
978 static intptr_t get_store_offset(Node* st, PhaseTransform* phase); | |
979 | |
980 Node* make_raw_address(intptr_t offset, PhaseTransform* phase); | |
981 | |
982 bool detect_init_independence(Node* n, bool st_is_pinned, int& count); | |
983 | |
984 void coalesce_subword_stores(intptr_t header_size, Node* size_in_bytes, | |
985 PhaseGVN* phase); | |
986 | |
987 intptr_t find_next_fullword_store(uint i, PhaseGVN* phase); | |
988 }; | |
989 | |
990 //------------------------------MergeMem--------------------------------------- | |
991 // (See comment in memnode.cpp near MergeMemNode::MergeMemNode for semantics.) | |
992 class MergeMemNode: public Node { | |
993 virtual uint hash() const ; // { return NO_HASH; } | |
994 virtual uint cmp( const Node &n ) const ; // Always fail, except on self | |
995 friend class MergeMemStream; | |
996 MergeMemNode(Node* def); // clients use MergeMemNode::make | |
997 | |
998 public: | |
999 // If the input is a whole memory state, clone it with all its slices intact. | |
1000 // Otherwise, make a new memory state with just that base memory input. | |
1001 // In either case, the result is a newly created MergeMem. | |
1002 static MergeMemNode* make(Compile* C, Node* base_memory); | |
1003 | |
1004 virtual int Opcode() const; | |
1005 virtual Node *Identity( PhaseTransform *phase ); | |
1006 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
1007 virtual uint ideal_reg() const { return NotAMachineReg; } | |
1008 virtual uint match_edge(uint idx) const { return 0; } | |
1009 virtual const RegMask &out_RegMask() const; | |
1010 virtual const Type *bottom_type() const { return Type::MEMORY; } | |
1011 virtual const TypePtr *adr_type() const { return TypePtr::BOTTOM; } | |
1012 // sparse accessors | |
1013 // Fetch the previously stored "set_memory_at", or else the base memory. | |
1014 // (Caller should clone it if it is a phi-nest.) | |
1015 Node* memory_at(uint alias_idx) const; | |
1016 // set the memory, regardless of its previous value | |
1017 void set_memory_at(uint alias_idx, Node* n); | |
1018 // the "base" is the memory that provides the non-finite support | |
1019 Node* base_memory() const { return in(Compile::AliasIdxBot); } | |
1020 // warning: setting the base can implicitly set any of the other slices too | |
1021 void set_base_memory(Node* def); | |
1022 // sentinel value which denotes a copy of the base memory: | |
1023 Node* empty_memory() const { return in(Compile::AliasIdxTop); } | |
1024 static Node* make_empty_memory(); // where the sentinel comes from | |
1025 bool is_empty_memory(Node* n) const { assert((n == empty_memory()) == n->is_top(), "sanity"); return n->is_top(); } | |
1026 // hook for the iterator, to perform any necessary setup | |
1027 void iteration_setup(const MergeMemNode* other = NULL); | |
1028 // push sentinels until I am at least as long as the other (semantic no-op) | |
1029 void grow_to_match(const MergeMemNode* other); | |
1030 bool verify_sparse() const PRODUCT_RETURN0; | |
1031 #ifndef PRODUCT | |
1032 virtual void dump_spec(outputStream *st) const; | |
1033 #endif | |
1034 }; | |
1035 | |
1036 class MergeMemStream : public StackObj { | |
1037 private: | |
1038 MergeMemNode* _mm; | |
1039 const MergeMemNode* _mm2; // optional second guy, contributes non-empty iterations | |
1040 Node* _mm_base; // loop-invariant base memory of _mm | |
1041 int _idx; | |
1042 int _cnt; | |
1043 Node* _mem; | |
1044 Node* _mem2; | |
1045 int _cnt2; | |
1046 | |
1047 void init(MergeMemNode* mm, const MergeMemNode* mm2 = NULL) { | |
1048 // subsume_node will break sparseness at times, whenever a memory slice | |
1049 // folds down to a copy of the base ("fat") memory. In such a case, | |
1050 // the raw edge will update to base, although it should be top. | |
1051 // This iterator will recognize either top or base_memory as an | |
1052 // "empty" slice. See is_empty, is_empty2, and next below. | |
1053 // | |
1054 // The sparseness property is repaired in MergeMemNode::Ideal. | |
1055 // As long as access to a MergeMem goes through this iterator | |
1056 // or the memory_at accessor, flaws in the sparseness will | |
1057 // never be observed. | |
1058 // | |
1059 // Also, iteration_setup repairs sparseness. | |
1060 assert(mm->verify_sparse(), "please, no dups of base"); | |
1061 assert(mm2==NULL || mm2->verify_sparse(), "please, no dups of base"); | |
1062 | |
1063 _mm = mm; | |
1064 _mm_base = mm->base_memory(); | |
1065 _mm2 = mm2; | |
1066 _cnt = mm->req(); | |
1067 _idx = Compile::AliasIdxBot-1; // start at the base memory | |
1068 _mem = NULL; | |
1069 _mem2 = NULL; | |
1070 } | |
1071 | |
1072 #ifdef ASSERT | |
1073 Node* check_memory() const { | |
1074 if (at_base_memory()) | |
1075 return _mm->base_memory(); | |
1076 else if ((uint)_idx < _mm->req() && !_mm->in(_idx)->is_top()) | |
1077 return _mm->memory_at(_idx); | |
1078 else | |
1079 return _mm_base; | |
1080 } | |
1081 Node* check_memory2() const { | |
1082 return at_base_memory()? _mm2->base_memory(): _mm2->memory_at(_idx); | |
1083 } | |
1084 #endif | |
1085 | |
1086 static bool match_memory(Node* mem, const MergeMemNode* mm, int idx) PRODUCT_RETURN0; | |
1087 void assert_synch() const { | |
1088 assert(!_mem || _idx >= _cnt || match_memory(_mem, _mm, _idx), | |
1089 "no side-effects except through the stream"); | |
1090 } | |
1091 | |
1092 public: | |
1093 | |
1094 // expected usages: | |
1095 // for (MergeMemStream mms(mem->is_MergeMem()); next_non_empty(); ) { ... } | |
1096 // for (MergeMemStream mms(mem1, mem2); next_non_empty2(); ) { ... } | |
1097 | |
1098 // iterate over one merge | |
1099 MergeMemStream(MergeMemNode* mm) { | |
1100 mm->iteration_setup(); | |
1101 init(mm); | |
1102 debug_only(_cnt2 = 999); | |
1103 } | |
1104 // iterate in parallel over two merges | |
1105 // only iterates through non-empty elements of mm2 | |
1106 MergeMemStream(MergeMemNode* mm, const MergeMemNode* mm2) { | |
1107 assert(mm2, "second argument must be a MergeMem also"); | |
1108 ((MergeMemNode*)mm2)->iteration_setup(); // update hidden state | |
1109 mm->iteration_setup(mm2); | |
1110 init(mm, mm2); | |
1111 _cnt2 = mm2->req(); | |
1112 } | |
1113 #ifdef ASSERT | |
1114 ~MergeMemStream() { | |
1115 assert_synch(); | |
1116 } | |
1117 #endif | |
1118 | |
1119 MergeMemNode* all_memory() const { | |
1120 return _mm; | |
1121 } | |
1122 Node* base_memory() const { | |
1123 assert(_mm_base == _mm->base_memory(), "no update to base memory, please"); | |
1124 return _mm_base; | |
1125 } | |
1126 const MergeMemNode* all_memory2() const { | |
1127 assert(_mm2 != NULL, ""); | |
1128 return _mm2; | |
1129 } | |
1130 bool at_base_memory() const { | |
1131 return _idx == Compile::AliasIdxBot; | |
1132 } | |
1133 int alias_idx() const { | |
1134 assert(_mem, "must call next 1st"); | |
1135 return _idx; | |
1136 } | |
1137 | |
1138 const TypePtr* adr_type() const { | |
1139 return Compile::current()->get_adr_type(alias_idx()); | |
1140 } | |
1141 | |
1142 const TypePtr* adr_type(Compile* C) const { | |
1143 return C->get_adr_type(alias_idx()); | |
1144 } | |
1145 bool is_empty() const { | |
1146 assert(_mem, "must call next 1st"); | |
1147 assert(_mem->is_top() == (_mem==_mm->empty_memory()), "correct sentinel"); | |
1148 return _mem->is_top(); | |
1149 } | |
1150 bool is_empty2() const { | |
1151 assert(_mem2, "must call next 1st"); | |
1152 assert(_mem2->is_top() == (_mem2==_mm2->empty_memory()), "correct sentinel"); | |
1153 return _mem2->is_top(); | |
1154 } | |
1155 Node* memory() const { | |
1156 assert(!is_empty(), "must not be empty"); | |
1157 assert_synch(); | |
1158 return _mem; | |
1159 } | |
1160 // get the current memory, regardless of empty or non-empty status | |
1161 Node* force_memory() const { | |
1162 assert(!is_empty() || !at_base_memory(), ""); | |
1163 // Use _mm_base to defend against updates to _mem->base_memory(). | |
1164 Node *mem = _mem->is_top() ? _mm_base : _mem; | |
1165 assert(mem == check_memory(), ""); | |
1166 return mem; | |
1167 } | |
1168 Node* memory2() const { | |
1169 assert(_mem2 == check_memory2(), ""); | |
1170 return _mem2; | |
1171 } | |
1172 void set_memory(Node* mem) { | |
1173 if (at_base_memory()) { | |
1174 // Note that this does not change the invariant _mm_base. | |
1175 _mm->set_base_memory(mem); | |
1176 } else { | |
1177 _mm->set_memory_at(_idx, mem); | |
1178 } | |
1179 _mem = mem; | |
1180 assert_synch(); | |
1181 } | |
1182 | |
1183 // Recover from a side effect to the MergeMemNode. | |
1184 void set_memory() { | |
1185 _mem = _mm->in(_idx); | |
1186 } | |
1187 | |
1188 bool next() { return next(false); } | |
1189 bool next2() { return next(true); } | |
1190 | |
1191 bool next_non_empty() { return next_non_empty(false); } | |
1192 bool next_non_empty2() { return next_non_empty(true); } | |
1193 // next_non_empty2 can yield states where is_empty() is true | |
1194 | |
1195 private: | |
1196 // find the next item, which might be empty | |
1197 bool next(bool have_mm2) { | |
1198 assert((_mm2 != NULL) == have_mm2, "use other next"); | |
1199 assert_synch(); | |
1200 if (++_idx < _cnt) { | |
1201 // Note: This iterator allows _mm to be non-sparse. | |
1202 // It behaves the same whether _mem is top or base_memory. | |
1203 _mem = _mm->in(_idx); | |
1204 if (have_mm2) | |
1205 _mem2 = _mm2->in((_idx < _cnt2) ? _idx : Compile::AliasIdxTop); | |
1206 return true; | |
1207 } | |
1208 return false; | |
1209 } | |
1210 | |
1211 // find the next non-empty item | |
1212 bool next_non_empty(bool have_mm2) { | |
1213 while (next(have_mm2)) { | |
1214 if (!is_empty()) { | |
1215 // make sure _mem2 is filled in sensibly | |
1216 if (have_mm2 && _mem2->is_top()) _mem2 = _mm2->base_memory(); | |
1217 return true; | |
1218 } else if (have_mm2 && !is_empty2()) { | |
1219 return true; // is_empty() == true | |
1220 } | |
1221 } | |
1222 return false; | |
1223 } | |
1224 }; | |
1225 | |
1226 //------------------------------Prefetch--------------------------------------- | |
1227 | |
1228 // Non-faulting prefetch load. Prefetch for many reads. | |
1229 class PrefetchReadNode : public Node { | |
1230 public: | |
1231 PrefetchReadNode(Node *abio, Node *adr) : Node(0,abio,adr) {} | |
1232 virtual int Opcode() const; | |
1233 virtual uint ideal_reg() const { return NotAMachineReg; } | |
1234 virtual uint match_edge(uint idx) const { return idx==2; } | |
1235 virtual const Type *bottom_type() const { return Type::ABIO; } | |
1236 }; | |
1237 | |
1238 // Non-faulting prefetch load. Prefetch for many reads & many writes. | |
1239 class PrefetchWriteNode : public Node { | |
1240 public: | |
1241 PrefetchWriteNode(Node *abio, Node *adr) : Node(0,abio,adr) {} | |
1242 virtual int Opcode() const; | |
1243 virtual uint ideal_reg() const { return NotAMachineReg; } | |
1244 virtual uint match_edge(uint idx) const { return idx==2; } | |
1245 virtual const Type *bottom_type() const { return Type::ABIO; } | |
1246 }; |