1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2024, Alibaba Group Holding Limited. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
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9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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25
26 #ifndef SHARE_OPTO_MEMNODE_HPP
27 #define SHARE_OPTO_MEMNODE_HPP
28
29 #include "opto/multnode.hpp"
30 #include "opto/node.hpp"
31 #include "opto/opcodes.hpp"
32 #include "opto/type.hpp"
33
34 // Portions of code courtesy of Clifford Click
35
36 class MultiNode;
37 class PhaseCCP;
38 class PhaseTransform;
39
40 //------------------------------MemNode----------------------------------------
41 // Load or Store, possibly throwing a null pointer exception
42 class MemNode : public Node {
43 private:
44 bool _unaligned_access; // Unaligned access from unsafe
45 bool _mismatched_access; // Mismatched access from unsafe: byte read in integer array for instance
46 bool _unsafe_access; // Access of unsafe origin.
47 uint8_t _barrier_data; // Bit field with barrier information
48
49 protected:
50 #ifdef ASSERT
51 const TypePtr* _adr_type; // What kind of memory is being addressed?
52 #endif
53 virtual uint size_of() const;
54 public:
55 enum { Control, // When is it safe to do this load?
56 Memory, // Chunk of memory is being loaded from
57 Address, // Actually address, derived from base
58 ValueIn // Value to store
59 };
60 typedef enum { unordered = 0,
61 acquire, // Load has to acquire or be succeeded by MemBarAcquire.
62 release, // Store has to release or be preceded by MemBarRelease.
63 seqcst, // LoadStore has to have both acquire and release semantics.
64 unset // The memory ordering is not set (used for testing)
65 } MemOrd;
66 protected:
67 MemNode( Node *c0, Node *c1, Node *c2, const TypePtr* at ) :
68 Node(c0,c1,c2),
69 _unaligned_access(false),
70 _mismatched_access(false),
71 _unsafe_access(false),
72 _barrier_data(0) {
73 init_class_id(Class_Mem);
74 debug_only(_adr_type=at; adr_type();)
75 }
76 MemNode( Node *c0, Node *c1, Node *c2, const TypePtr* at, Node *c3 ) :
77 Node(c0,c1,c2,c3),
78 _unaligned_access(false),
79 _mismatched_access(false),
80 _unsafe_access(false),
81 _barrier_data(0) {
82 init_class_id(Class_Mem);
83 debug_only(_adr_type=at; adr_type();)
84 }
85 MemNode( Node *c0, Node *c1, Node *c2, const TypePtr* at, Node *c3, Node *c4) :
86 Node(c0,c1,c2,c3,c4),
87 _unaligned_access(false),
88 _mismatched_access(false),
89 _unsafe_access(false),
90 _barrier_data(0) {
91 init_class_id(Class_Mem);
92 debug_only(_adr_type=at; adr_type();)
93 }
94
95 virtual Node* find_previous_arraycopy(PhaseValues* phase, Node* ld_alloc, Node*& mem, bool can_see_stored_value) const { return nullptr; }
96 ArrayCopyNode* find_array_copy_clone(Node* ld_alloc, Node* mem) const;
97 static bool check_if_adr_maybe_raw(Node* adr);
98
99 public:
100 // Helpers for the optimizer. Documented in memnode.cpp.
101 static bool detect_ptr_independence(Node* p1, AllocateNode* a1,
102 Node* p2, AllocateNode* a2,
103 PhaseTransform* phase);
104 static bool adr_phi_is_loop_invariant(Node* adr_phi, Node* cast);
105
106 static Node *optimize_simple_memory_chain(Node *mchain, const TypeOopPtr *t_oop, Node *load, PhaseGVN *phase);
107 static Node *optimize_memory_chain(Node *mchain, const TypePtr *t_adr, Node *load, PhaseGVN *phase);
108 // The following two should probably be phase-specific functions:
109 static DomResult maybe_all_controls_dominate(Node* dom, Node* sub);
110 static bool all_controls_dominate(Node* dom, Node* sub) {
111 DomResult dom_result = maybe_all_controls_dominate(dom, sub);
112 return dom_result == DomResult::Dominate;
113 }
114
115 virtual const class TypePtr *adr_type() const; // returns bottom_type of address
116
117 // Shared code for Ideal methods:
118 Node *Ideal_common(PhaseGVN *phase, bool can_reshape); // Return -1 for short-circuit null.
119
120 // Helper function for adr_type() implementations.
121 static const TypePtr* calculate_adr_type(const Type* t, const TypePtr* cross_check = nullptr);
122
123 // Raw access function, to allow copying of adr_type efficiently in
124 // product builds and retain the debug info for debug builds.
125 const TypePtr *raw_adr_type() const {
126 return DEBUG_ONLY(_adr_type) NOT_DEBUG(nullptr);
127 }
128
129 #ifdef ASSERT
130 void set_adr_type(const TypePtr* adr_type) { _adr_type = adr_type; }
131 #endif
132
133 // Return the barrier data of n, if available, or 0 otherwise.
134 static uint8_t barrier_data(const Node* n);
135
136 // Map a load or store opcode to its corresponding store opcode.
137 // (Return -1 if unknown.)
138 virtual int store_Opcode() const { return -1; }
139
140 // What is the type of the value in memory? (T_VOID mean "unspecified".)
141 virtual BasicType memory_type() const = 0;
142 virtual int memory_size() const {
143 #ifdef ASSERT
144 return type2aelembytes(memory_type(), true);
145 #else
146 return type2aelembytes(memory_type());
147 #endif
148 }
149
150 uint8_t barrier_data() { return _barrier_data; }
151 void set_barrier_data(uint8_t barrier_data) { _barrier_data = barrier_data; }
152
153 // Search through memory states which precede this node (load or store).
154 // Look for an exact match for the address, with no intervening
155 // aliased stores.
156 Node* find_previous_store(PhaseValues* phase);
157
158 // Can this node (load or store) accurately see a stored value in
159 // the given memory state? (The state may or may not be in(Memory).)
160 Node* can_see_stored_value(Node* st, PhaseValues* phase) const;
161
162 void set_unaligned_access() { _unaligned_access = true; }
163 bool is_unaligned_access() const { return _unaligned_access; }
164 void set_mismatched_access() { _mismatched_access = true; }
165 bool is_mismatched_access() const { return _mismatched_access; }
166 void set_unsafe_access() { _unsafe_access = true; }
167 bool is_unsafe_access() const { return _unsafe_access; }
168
169 #ifndef PRODUCT
170 static void dump_adr_type(const Node* mem, const TypePtr* adr_type, outputStream *st);
171 virtual void dump_spec(outputStream *st) const;
172 #endif
173 };
174
175 //------------------------------LoadNode---------------------------------------
176 // Load value; requires Memory and Address
177 class LoadNode : public MemNode {
178 public:
179 // Some loads (from unsafe) should be pinned: they don't depend only
180 // on the dominating test. The field _control_dependency below records
181 // whether that node depends only on the dominating test.
182 // Pinned and UnknownControl are similar, but differ in that Pinned
183 // loads are not allowed to float across safepoints, whereas UnknownControl
184 // loads are allowed to do that. Therefore, Pinned is stricter.
185 enum ControlDependency {
186 Pinned,
187 UnknownControl,
188 DependsOnlyOnTest
189 };
190
191 private:
192 // LoadNode::hash() doesn't take the _control_dependency field
193 // into account: If the graph already has a non-pinned LoadNode and
194 // we add a pinned LoadNode with the same inputs, it's safe for GVN
195 // to replace the pinned LoadNode with the non-pinned LoadNode,
196 // otherwise it wouldn't be safe to have a non pinned LoadNode with
197 // those inputs in the first place. If the graph already has a
198 // pinned LoadNode and we add a non pinned LoadNode with the same
199 // inputs, it's safe (but suboptimal) for GVN to replace the
200 // non-pinned LoadNode by the pinned LoadNode.
201 ControlDependency _control_dependency;
202
203 // On platforms with weak memory ordering (e.g., PPC) we distinguish
204 // loads that can be reordered, and such requiring acquire semantics to
205 // adhere to the Java specification. The required behaviour is stored in
206 // this field.
207 const MemOrd _mo;
208
209 AllocateNode* is_new_object_mark_load() const;
210
211 protected:
212 virtual bool cmp(const Node &n) const;
213 virtual uint size_of() const; // Size is bigger
214 // Should LoadNode::Ideal() attempt to remove control edges?
215 virtual bool can_remove_control() const;
216 const Type* const _type; // What kind of value is loaded?
217
218 virtual Node* find_previous_arraycopy(PhaseValues* phase, Node* ld_alloc, Node*& mem, bool can_see_stored_value) const;
219 public:
220
221 LoadNode(Node *c, Node *mem, Node *adr, const TypePtr* at, const Type *rt, MemOrd mo, ControlDependency control_dependency)
222 : MemNode(c,mem,adr,at), _control_dependency(control_dependency), _mo(mo), _type(rt) {
223 init_class_id(Class_Load);
224 }
225 inline bool is_unordered() const { return !is_acquire(); }
226 inline bool is_acquire() const {
227 assert(_mo == unordered || _mo == acquire, "unexpected");
228 return _mo == acquire;
229 }
230 inline bool is_unsigned() const {
231 int lop = Opcode();
232 return (lop == Op_LoadUB) || (lop == Op_LoadUS);
233 }
234
235 // Polymorphic factory method:
236 static Node* make(PhaseGVN& gvn, Node* c, Node* mem, Node* adr,
237 const TypePtr* at, const Type* rt, BasicType bt,
238 MemOrd mo, ControlDependency control_dependency = DependsOnlyOnTest,
239 bool require_atomic_access = false, bool unaligned = false, bool mismatched = false, bool unsafe = false,
240 uint8_t barrier_data = 0);
241
242 virtual uint hash() const; // Check the type
243
244 // Handle algebraic identities here. If we have an identity, return the Node
245 // we are equivalent to. We look for Load of a Store.
246 virtual Node* Identity(PhaseGVN* phase);
247
248 // If the load is from Field memory and the pointer is non-null, it might be possible to
249 // zero out the control input.
250 // If the offset is constant and the base is an object allocation,
251 // try to hook me up to the exact initializing store.
252 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
253
254 // Return true if it's possible to split the Load through a Phi merging the bases
255 bool can_split_through_phi_base(PhaseGVN *phase);
256
257 // Split instance field load through Phi.
258 Node* split_through_phi(PhaseGVN *phase, bool ignore_missing_instance_id = false);
259
260 // Recover original value from boxed values
261 Node *eliminate_autobox(PhaseIterGVN *igvn);
262
263 // Compute a new Type for this node. Basically we just do the pre-check,
264 // then call the virtual add() to set the type.
265 virtual const Type* Value(PhaseGVN* phase) const;
266
267 // Common methods for LoadKlass and LoadNKlass nodes.
268 const Type* klass_value_common(PhaseGVN* phase) const;
269 Node* klass_identity_common(PhaseGVN* phase);
270
271 virtual uint ideal_reg() const;
272 virtual const Type *bottom_type() const;
273 // Following method is copied from TypeNode:
274 void set_type(const Type* t) {
275 assert(t != nullptr, "sanity");
276 debug_only(uint check_hash = (VerifyHashTableKeys && _hash_lock) ? hash() : NO_HASH);
277 *(const Type**)&_type = t; // cast away const-ness
278 // If this node is in the hash table, make sure it doesn't need a rehash.
279 assert(check_hash == NO_HASH || check_hash == hash(), "type change must preserve hash code");
280 }
281 const Type* type() const { assert(_type != nullptr, "sanity"); return _type; };
282
283 // Do not match memory edge
284 virtual uint match_edge(uint idx) const;
285
286 // Map a load opcode to its corresponding store opcode.
287 virtual int store_Opcode() const = 0;
288
289 // Check if the load's memory input is a Phi node with the same control.
290 bool is_instance_field_load_with_local_phi(Node* ctrl);
291
292 Node* convert_to_unsigned_load(PhaseGVN& gvn);
293 Node* convert_to_signed_load(PhaseGVN& gvn);
294
295 bool has_reinterpret_variant(const Type* rt);
296 Node* convert_to_reinterpret_load(PhaseGVN& gvn, const Type* rt);
297
298 ControlDependency control_dependency() const { return _control_dependency; }
299 bool has_unknown_control_dependency() const { return _control_dependency == UnknownControl; }
300 bool has_pinned_control_dependency() const { return _control_dependency == Pinned; }
301
302 LoadNode* pin_array_access_node() const;
303
304 #ifndef PRODUCT
305 virtual void dump_spec(outputStream *st) const;
306 #endif
307 #ifdef ASSERT
308 // Helper function to allow a raw load without control edge for some cases
309 static bool is_immutable_value(Node* adr);
310 #endif
311 protected:
312 const Type* load_array_final_field(const TypeKlassPtr *tkls,
313 ciKlass* klass) const;
314
315 Node* can_see_arraycopy_value(Node* st, PhaseGVN* phase) const;
316
317 // depends_only_on_test is almost always true, and needs to be almost always
318 // true to enable key hoisting & commoning optimizations. However, for the
319 // special case of RawPtr loads from TLS top & end, and other loads performed by
320 // GC barriers, the control edge carries the dependence preventing hoisting past
321 // a Safepoint instead of the memory edge. (An unfortunate consequence of having
322 // Safepoints not set Raw Memory; itself an unfortunate consequence of having Nodes
323 // which produce results (new raw memory state) inside of loops preventing all
324 // manner of other optimizations). Basically, it's ugly but so is the alternative.
325 // See comment in macro.cpp, around line 125 expand_allocate_common().
326 virtual bool depends_only_on_test() const {
327 return adr_type() != TypeRawPtr::BOTTOM && _control_dependency == DependsOnlyOnTest;
328 }
329
330 LoadNode* clone_pinned() const;
331 };
332
333 //------------------------------LoadBNode--------------------------------------
334 // Load a byte (8bits signed) from memory
335 class LoadBNode : public LoadNode {
336 public:
337 LoadBNode(Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeInt *ti, MemOrd mo, ControlDependency control_dependency = DependsOnlyOnTest)
338 : LoadNode(c, mem, adr, at, ti, mo, control_dependency) {}
339 virtual int Opcode() const;
340 virtual uint ideal_reg() const { return Op_RegI; }
341 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
342 virtual const Type* Value(PhaseGVN* phase) const;
343 virtual int store_Opcode() const { return Op_StoreB; }
344 virtual BasicType memory_type() const { return T_BYTE; }
345 };
346
347 //------------------------------LoadUBNode-------------------------------------
348 // Load a unsigned byte (8bits unsigned) from memory
349 class LoadUBNode : public LoadNode {
350 public:
351 LoadUBNode(Node* c, Node* mem, Node* adr, const TypePtr* at, const TypeInt* ti, MemOrd mo, ControlDependency control_dependency = DependsOnlyOnTest)
352 : LoadNode(c, mem, adr, at, ti, mo, control_dependency) {}
353 virtual int Opcode() const;
354 virtual uint ideal_reg() const { return Op_RegI; }
355 virtual Node* Ideal(PhaseGVN *phase, bool can_reshape);
356 virtual const Type* Value(PhaseGVN* phase) const;
357 virtual int store_Opcode() const { return Op_StoreB; }
358 virtual BasicType memory_type() const { return T_BYTE; }
359 };
360
361 //------------------------------LoadUSNode-------------------------------------
362 // Load an unsigned short/char (16bits unsigned) from memory
363 class LoadUSNode : public LoadNode {
364 public:
365 LoadUSNode(Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeInt *ti, MemOrd mo, ControlDependency control_dependency = DependsOnlyOnTest)
366 : LoadNode(c, mem, adr, at, ti, mo, control_dependency) {}
367 virtual int Opcode() const;
368 virtual uint ideal_reg() const { return Op_RegI; }
369 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
370 virtual const Type* Value(PhaseGVN* phase) const;
371 virtual int store_Opcode() const { return Op_StoreC; }
372 virtual BasicType memory_type() const { return T_CHAR; }
373 };
374
375 //------------------------------LoadSNode--------------------------------------
376 // Load a short (16bits signed) from memory
377 class LoadSNode : public LoadNode {
378 public:
379 LoadSNode(Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeInt *ti, MemOrd mo, ControlDependency control_dependency = DependsOnlyOnTest)
380 : LoadNode(c, mem, adr, at, ti, mo, control_dependency) {}
381 virtual int Opcode() const;
382 virtual uint ideal_reg() const { return Op_RegI; }
383 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
384 virtual const Type* Value(PhaseGVN* phase) const;
385 virtual int store_Opcode() const { return Op_StoreC; }
386 virtual BasicType memory_type() const { return T_SHORT; }
387 };
388
389 //------------------------------LoadINode--------------------------------------
390 // Load an integer from memory
391 class LoadINode : public LoadNode {
392 public:
393 LoadINode(Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeInt *ti, MemOrd mo, ControlDependency control_dependency = DependsOnlyOnTest)
394 : LoadNode(c, mem, adr, at, ti, mo, control_dependency) {}
395 virtual int Opcode() const;
396 virtual uint ideal_reg() const { return Op_RegI; }
397 virtual int store_Opcode() const { return Op_StoreI; }
398 virtual BasicType memory_type() const { return T_INT; }
399 };
400
401 //------------------------------LoadRangeNode----------------------------------
402 // Load an array length from the array
403 class LoadRangeNode : public LoadINode {
404 public:
405 LoadRangeNode(Node *c, Node *mem, Node *adr, const TypeInt *ti = TypeInt::POS)
406 : LoadINode(c, mem, adr, TypeAryPtr::RANGE, ti, MemNode::unordered) {}
407 virtual int Opcode() const;
408 virtual const Type* Value(PhaseGVN* phase) const;
409 virtual Node* Identity(PhaseGVN* phase);
410 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
411 };
412
413 //------------------------------LoadLNode--------------------------------------
414 // Load a long from memory
415 class LoadLNode : public LoadNode {
416 virtual uint hash() const { return LoadNode::hash() + _require_atomic_access; }
417 virtual bool cmp( const Node &n ) const {
418 return _require_atomic_access == ((LoadLNode&)n)._require_atomic_access
419 && LoadNode::cmp(n);
420 }
421 virtual uint size_of() const { return sizeof(*this); }
422 const bool _require_atomic_access; // is piecewise load forbidden?
423
424 public:
425 LoadLNode(Node *c, Node *mem, Node *adr, const TypePtr* at, const TypeLong *tl,
426 MemOrd mo, ControlDependency control_dependency = DependsOnlyOnTest, bool require_atomic_access = false)
427 : LoadNode(c, mem, adr, at, tl, mo, control_dependency), _require_atomic_access(require_atomic_access) {}
428 virtual int Opcode() const;
429 virtual uint ideal_reg() const { return Op_RegL; }
430 virtual int store_Opcode() const { return Op_StoreL; }
431 virtual BasicType memory_type() const { return T_LONG; }
432 bool require_atomic_access() const { return _require_atomic_access; }
433
434 #ifndef PRODUCT
435 virtual void dump_spec(outputStream *st) const {
436 LoadNode::dump_spec(st);
437 if (_require_atomic_access) st->print(" Atomic!");
438 }
439 #endif
440 };
441
442 //------------------------------LoadL_unalignedNode----------------------------
443 // Load a long from unaligned memory
444 class LoadL_unalignedNode : public LoadLNode {
445 public:
446 LoadL_unalignedNode(Node *c, Node *mem, Node *adr, const TypePtr* at, MemOrd mo, ControlDependency control_dependency = DependsOnlyOnTest)
447 : LoadLNode(c, mem, adr, at, TypeLong::LONG, mo, control_dependency) {}
448 virtual int Opcode() const;
449 };
450
451 //------------------------------LoadFNode--------------------------------------
452 // Load a float (64 bits) from memory
453 class LoadFNode : public LoadNode {
454 public:
455 LoadFNode(Node *c, Node *mem, Node *adr, const TypePtr* at, const Type *t, MemOrd mo, ControlDependency control_dependency = DependsOnlyOnTest)
456 : LoadNode(c, mem, adr, at, t, mo, control_dependency) {}
457 virtual int Opcode() const;
458 virtual uint ideal_reg() const { return Op_RegF; }
459 virtual int store_Opcode() const { return Op_StoreF; }
460 virtual BasicType memory_type() const { return T_FLOAT; }
461 };
462
463 //------------------------------LoadDNode--------------------------------------
464 // Load a double (64 bits) from memory
465 class LoadDNode : public LoadNode {
466 virtual uint hash() const { return LoadNode::hash() + _require_atomic_access; }
467 virtual bool cmp( const Node &n ) const {
468 return _require_atomic_access == ((LoadDNode&)n)._require_atomic_access
469 && LoadNode::cmp(n);
470 }
471 virtual uint size_of() const { return sizeof(*this); }
472 const bool _require_atomic_access; // is piecewise load forbidden?
473
474 public:
475 LoadDNode(Node *c, Node *mem, Node *adr, const TypePtr* at, const Type *t,
476 MemOrd mo, ControlDependency control_dependency = DependsOnlyOnTest, bool require_atomic_access = false)
477 : LoadNode(c, mem, adr, at, t, mo, control_dependency), _require_atomic_access(require_atomic_access) {}
478 virtual int Opcode() const;
479 virtual uint ideal_reg() const { return Op_RegD; }
480 virtual int store_Opcode() const { return Op_StoreD; }
481 virtual BasicType memory_type() const { return T_DOUBLE; }
482 bool require_atomic_access() const { return _require_atomic_access; }
483
484 #ifndef PRODUCT
485 virtual void dump_spec(outputStream *st) const {
486 LoadNode::dump_spec(st);
487 if (_require_atomic_access) st->print(" Atomic!");
488 }
489 #endif
490 };
491
492 //------------------------------LoadD_unalignedNode----------------------------
493 // Load a double from unaligned memory
494 class LoadD_unalignedNode : public LoadDNode {
495 public:
496 LoadD_unalignedNode(Node *c, Node *mem, Node *adr, const TypePtr* at, MemOrd mo, ControlDependency control_dependency = DependsOnlyOnTest)
497 : LoadDNode(c, mem, adr, at, Type::DOUBLE, mo, control_dependency) {}
498 virtual int Opcode() const;
499 };
500
501 //------------------------------LoadPNode--------------------------------------
502 // Load a pointer from memory (either object or array)
503 class LoadPNode : public LoadNode {
504 public:
505 LoadPNode(Node *c, Node *mem, Node *adr, const TypePtr *at, const TypePtr* t, MemOrd mo, ControlDependency control_dependency = DependsOnlyOnTest)
506 : LoadNode(c, mem, adr, at, t, mo, control_dependency) {}
507 virtual int Opcode() const;
508 virtual uint ideal_reg() const { return Op_RegP; }
509 virtual int store_Opcode() const { return Op_StoreP; }
510 virtual BasicType memory_type() const { return T_ADDRESS; }
511 };
512
513
514 //------------------------------LoadNNode--------------------------------------
515 // Load a narrow oop from memory (either object or array)
516 class LoadNNode : public LoadNode {
517 public:
518 LoadNNode(Node *c, Node *mem, Node *adr, const TypePtr *at, const Type* t, MemOrd mo, ControlDependency control_dependency = DependsOnlyOnTest)
519 : LoadNode(c, mem, adr, at, t, mo, control_dependency) {}
520 virtual Node* Ideal(PhaseGVN* phase, bool can_reshape);
521 virtual int Opcode() const;
522 virtual uint ideal_reg() const { return Op_RegN; }
523 virtual int store_Opcode() const { return Op_StoreN; }
524 virtual BasicType memory_type() const { return T_NARROWOOP; }
525 };
526
527 //------------------------------LoadKlassNode----------------------------------
528 // Load a Klass from an object
529 class LoadKlassNode : public LoadPNode {
530 private:
531 LoadKlassNode(Node* mem, Node* adr, const TypePtr* at, const TypeKlassPtr* tk, MemOrd mo)
532 : LoadPNode(nullptr, mem, adr, at, tk, mo) {}
533
534 public:
535 virtual int Opcode() const;
536 virtual const Type* Value(PhaseGVN* phase) const;
537 virtual Node* Identity(PhaseGVN* phase);
538 virtual bool depends_only_on_test() const { return true; }
539
540 // Polymorphic factory method:
541 static Node* make(PhaseGVN& gvn, Node* mem, Node* adr, const TypePtr* at,
542 const TypeKlassPtr* tk = TypeInstKlassPtr::OBJECT);
543 };
544
545 //------------------------------LoadNKlassNode---------------------------------
546 // Load a narrow Klass from an object.
547 // With compact headers, the input address (adr) does not point at the exact
548 // header position where the (narrow) class pointer is located, but into the
549 // middle of the mark word (see oopDesc::klass_offset_in_bytes()). This node
550 // implicitly shifts the loaded value (markWord::klass_shift_at_offset bits) to
551 // extract the actual class pointer. C2's type system is agnostic on whether the
552 // input address directly points into the class pointer.
553 class LoadNKlassNode : public LoadNNode {
554 private:
555 friend Node* LoadKlassNode::make(PhaseGVN&, Node*, Node*, const TypePtr*, const TypeKlassPtr*);
556 LoadNKlassNode(Node* mem, Node* adr, const TypePtr* at, const TypeNarrowKlass* tk, MemOrd mo)
557 : LoadNNode(nullptr, mem, adr, at, tk, mo) {}
558
559 public:
560 virtual int Opcode() const;
561 virtual uint ideal_reg() const { return Op_RegN; }
562 virtual int store_Opcode() const { return Op_StoreNKlass; }
563 virtual BasicType memory_type() const { return T_NARROWKLASS; }
564
565 virtual const Type* Value(PhaseGVN* phase) const;
566 virtual Node* Identity(PhaseGVN* phase);
567 virtual bool depends_only_on_test() const { return true; }
568 };
569
570 //------------------------------StoreNode--------------------------------------
571 // Store value; requires Store, Address and Value
572 class StoreNode : public MemNode {
573 private:
574 // On platforms with weak memory ordering (e.g., PPC) we distinguish
575 // stores that can be reordered, and such requiring release semantics to
576 // adhere to the Java specification. The required behaviour is stored in
577 // this field.
578 const MemOrd _mo;
579 // Needed for proper cloning.
580 virtual uint size_of() const { return sizeof(*this); }
581 protected:
582 virtual bool cmp( const Node &n ) const;
583 virtual bool depends_only_on_test() const { return false; }
584
585 Node *Ideal_masked_input (PhaseGVN *phase, uint mask);
586 Node* Ideal_sign_extended_input(PhaseGVN* phase, int num_rejected_bits);
587
588 public:
589 // We must ensure that stores of object references will be visible
590 // only after the object's initialization. So the callers of this
591 // procedure must indicate that the store requires `release'
592 // semantics, if the stored value is an object reference that might
593 // point to a new object and may become externally visible.
594 StoreNode(Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, MemOrd mo)
595 : MemNode(c, mem, adr, at, val), _mo(mo) {
596 init_class_id(Class_Store);
597 }
598 StoreNode(Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, Node *oop_store, MemOrd mo)
599 : MemNode(c, mem, adr, at, val, oop_store), _mo(mo) {
600 init_class_id(Class_Store);
601 }
602
603 inline bool is_unordered() const { return !is_release(); }
604 inline bool is_release() const {
605 assert((_mo == unordered || _mo == release), "unexpected");
606 return _mo == release;
607 }
608
609 // Conservatively release stores of object references in order to
610 // ensure visibility of object initialization.
611 static inline MemOrd release_if_reference(const BasicType t) {
612 #ifdef AARCH64
613 // AArch64 doesn't need a release store here because object
614 // initialization contains the necessary barriers.
615 return unordered;
616 #else
617 const MemOrd mo = (t == T_ARRAY ||
618 t == T_ADDRESS || // Might be the address of an object reference (`boxing').
619 t == T_OBJECT) ? release : unordered;
620 return mo;
621 #endif
622 }
623
624 // Polymorphic factory method
625 //
626 // We must ensure that stores of object references will be visible
627 // only after the object's initialization. So the callers of this
628 // procedure must indicate that the store requires `release'
629 // semantics, if the stored value is an object reference that might
630 // point to a new object and may become externally visible.
631 static StoreNode* make(PhaseGVN& gvn, Node* c, Node* mem, Node* adr,
632 const TypePtr* at, Node* val, BasicType bt,
633 MemOrd mo, bool require_atomic_access = false);
634
635 virtual uint hash() const; // Check the type
636
637 // If the store is to Field memory and the pointer is non-null, we can
638 // zero out the control input.
639 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
640
641 // Compute a new Type for this node. Basically we just do the pre-check,
642 // then call the virtual add() to set the type.
643 virtual const Type* Value(PhaseGVN* phase) const;
644
645 // Check for identity function on memory (Load then Store at same address)
646 virtual Node* Identity(PhaseGVN* phase);
647
648 // Do not match memory edge
649 virtual uint match_edge(uint idx) const;
650
651 virtual const Type *bottom_type() const; // returns Type::MEMORY
652
653 // Map a store opcode to its corresponding own opcode, trivially.
654 virtual int store_Opcode() const { return Opcode(); }
655
656 // have all possible loads of the value stored been optimized away?
657 bool value_never_loaded(PhaseValues* phase) const;
658
659 bool has_reinterpret_variant(const Type* vt);
660 Node* convert_to_reinterpret_store(PhaseGVN& gvn, Node* val, const Type* vt);
661
662 MemBarNode* trailing_membar() const;
663 };
664
665 //------------------------------StoreBNode-------------------------------------
666 // Store byte to memory
667 class StoreBNode : public StoreNode {
668 public:
669 StoreBNode(Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, MemOrd mo)
670 : StoreNode(c, mem, adr, at, val, mo) {}
671 virtual int Opcode() const;
672 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
673 virtual BasicType memory_type() const { return T_BYTE; }
674 };
675
676 //------------------------------StoreCNode-------------------------------------
677 // Store char/short to memory
678 class StoreCNode : public StoreNode {
679 public:
680 StoreCNode(Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, MemOrd mo)
681 : StoreNode(c, mem, adr, at, val, mo) {}
682 virtual int Opcode() const;
683 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
684 virtual BasicType memory_type() const { return T_CHAR; }
685 };
686
687 //------------------------------StoreINode-------------------------------------
688 // Store int to memory
689 class StoreINode : public StoreNode {
690 public:
691 StoreINode(Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, MemOrd mo)
692 : StoreNode(c, mem, adr, at, val, mo) {}
693 virtual int Opcode() const;
694 virtual BasicType memory_type() const { return T_INT; }
695 };
696
697 //------------------------------StoreLNode-------------------------------------
698 // Store long to memory
699 class StoreLNode : public StoreNode {
700 virtual uint hash() const { return StoreNode::hash() + _require_atomic_access; }
701 virtual bool cmp( const Node &n ) const {
702 return _require_atomic_access == ((StoreLNode&)n)._require_atomic_access
703 && StoreNode::cmp(n);
704 }
705 virtual uint size_of() const { return sizeof(*this); }
706 const bool _require_atomic_access; // is piecewise store forbidden?
707
708 public:
709 StoreLNode(Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, MemOrd mo, bool require_atomic_access = false)
710 : StoreNode(c, mem, adr, at, val, mo), _require_atomic_access(require_atomic_access) {}
711 virtual int Opcode() const;
712 virtual BasicType memory_type() const { return T_LONG; }
713 bool require_atomic_access() const { return _require_atomic_access; }
714
715 #ifndef PRODUCT
716 virtual void dump_spec(outputStream *st) const {
717 StoreNode::dump_spec(st);
718 if (_require_atomic_access) st->print(" Atomic!");
719 }
720 #endif
721 };
722
723 // Special StoreL for flat stores that emits GC barriers for field at 'oop_off' in the backend
724 class StoreLSpecialNode : public StoreNode {
725
726 public:
727 StoreLSpecialNode(Node* c, Node* mem, Node* adr, const TypePtr* at, Node* val, Node* oop_off, MemOrd mo)
728 : StoreNode(c, mem, adr, at, val, mo) {
729 set_mismatched_access();
730 if (oop_off != nullptr) {
731 add_req(oop_off);
732 }
733 }
734 virtual int Opcode() const;
735 virtual BasicType memory_type() const { return T_LONG; }
736
737 virtual uint match_edge(uint idx) const { return idx == MemNode::Address ||
738 idx == MemNode::ValueIn ||
739 idx == MemNode::ValueIn + 1; }
740 };
741
742 //------------------------------StoreFNode-------------------------------------
743 // Store float to memory
744 class StoreFNode : public StoreNode {
745 public:
746 StoreFNode(Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, MemOrd mo)
747 : StoreNode(c, mem, adr, at, val, mo) {}
748 virtual int Opcode() const;
749 virtual BasicType memory_type() const { return T_FLOAT; }
750 };
751
752 //------------------------------StoreDNode-------------------------------------
753 // Store double to memory
754 class StoreDNode : public StoreNode {
755 virtual uint hash() const { return StoreNode::hash() + _require_atomic_access; }
756 virtual bool cmp( const Node &n ) const {
757 return _require_atomic_access == ((StoreDNode&)n)._require_atomic_access
758 && StoreNode::cmp(n);
759 }
760 virtual uint size_of() const { return sizeof(*this); }
761 const bool _require_atomic_access; // is piecewise store forbidden?
762 public:
763 StoreDNode(Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val,
764 MemOrd mo, bool require_atomic_access = false)
765 : StoreNode(c, mem, adr, at, val, mo), _require_atomic_access(require_atomic_access) {}
766 virtual int Opcode() const;
767 virtual BasicType memory_type() const { return T_DOUBLE; }
768 bool require_atomic_access() const { return _require_atomic_access; }
769
770 #ifndef PRODUCT
771 virtual void dump_spec(outputStream *st) const {
772 StoreNode::dump_spec(st);
773 if (_require_atomic_access) st->print(" Atomic!");
774 }
775 #endif
776
777 };
778
779 //------------------------------StorePNode-------------------------------------
780 // Store pointer to memory
781 class StorePNode : public StoreNode {
782 public:
783 StorePNode(Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, MemOrd mo)
784 : StoreNode(c, mem, adr, at, val, mo) {}
785 virtual int Opcode() const;
786 virtual BasicType memory_type() const { return T_ADDRESS; }
787 };
788
789 //------------------------------StoreNNode-------------------------------------
790 // Store narrow oop to memory
791 class StoreNNode : public StoreNode {
792 public:
793 StoreNNode(Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, MemOrd mo)
794 : StoreNode(c, mem, adr, at, val, mo) {}
795 virtual int Opcode() const;
796 virtual BasicType memory_type() const { return T_NARROWOOP; }
797 };
798
799 //------------------------------StoreNKlassNode--------------------------------------
800 // Store narrow klass to memory
801 class StoreNKlassNode : public StoreNNode {
802 public:
803 StoreNKlassNode(Node *c, Node *mem, Node *adr, const TypePtr* at, Node *val, MemOrd mo)
804 : StoreNNode(c, mem, adr, at, val, mo) {}
805 virtual int Opcode() const;
806 virtual BasicType memory_type() const { return T_NARROWKLASS; }
807 };
808
809 //------------------------------SCMemProjNode---------------------------------------
810 // This class defines a projection of the memory state of a store conditional node.
811 // These nodes return a value, but also update memory.
812 class SCMemProjNode : public ProjNode {
813 public:
814 enum {SCMEMPROJCON = (uint)-2};
815 SCMemProjNode( Node *src) : ProjNode( src, SCMEMPROJCON) { }
816 virtual int Opcode() const;
817 virtual bool is_CFG() const { return false; }
818 virtual const Type *bottom_type() const {return Type::MEMORY;}
819 virtual const TypePtr *adr_type() const {
820 Node* ctrl = in(0);
821 if (ctrl == nullptr) return nullptr; // node is dead
822 return ctrl->in(MemNode::Memory)->adr_type();
823 }
824 virtual uint ideal_reg() const { return 0;} // memory projections don't have a register
825 virtual const Type* Value(PhaseGVN* phase) const;
826 #ifndef PRODUCT
827 virtual void dump_spec(outputStream *st) const {};
828 #endif
829 };
830
831 //------------------------------LoadStoreNode---------------------------
832 // Note: is_Mem() method returns 'true' for this class.
833 class LoadStoreNode : public Node {
834 private:
835 const Type* const _type; // What kind of value is loaded?
836 const TypePtr* _adr_type; // What kind of memory is being addressed?
837 uint8_t _barrier_data; // Bit field with barrier information
838 virtual uint size_of() const; // Size is bigger
839 public:
840 LoadStoreNode( Node *c, Node *mem, Node *adr, Node *val, const TypePtr* at, const Type* rt, uint required );
841 virtual bool depends_only_on_test() const { return false; }
842 virtual uint match_edge(uint idx) const { return idx == MemNode::Address || idx == MemNode::ValueIn; }
843
844 virtual const Type *bottom_type() const { return _type; }
845 virtual uint ideal_reg() const;
846 virtual const class TypePtr *adr_type() const { return _adr_type; } // returns bottom_type of address
847 virtual const Type* Value(PhaseGVN* phase) const;
848
849 bool result_not_used() const;
850 MemBarNode* trailing_membar() const;
851
852 uint8_t barrier_data() { return _barrier_data; }
853 void set_barrier_data(uint8_t barrier_data) { _barrier_data = barrier_data; }
854 };
855
856 class LoadStoreConditionalNode : public LoadStoreNode {
857 public:
858 enum {
859 ExpectedIn = MemNode::ValueIn+1 // One more input than MemNode
860 };
861 LoadStoreConditionalNode(Node *c, Node *mem, Node *adr, Node *val, Node *ex);
862 virtual const Type* Value(PhaseGVN* phase) const;
863 };
864
865 class CompareAndSwapNode : public LoadStoreConditionalNode {
866 private:
867 const MemNode::MemOrd _mem_ord;
868 public:
869 CompareAndSwapNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, MemNode::MemOrd mem_ord) : LoadStoreConditionalNode(c, mem, adr, val, ex), _mem_ord(mem_ord) {}
870 MemNode::MemOrd order() const {
871 return _mem_ord;
872 }
873 virtual uint size_of() const { return sizeof(*this); }
874 };
875
876 class CompareAndExchangeNode : public LoadStoreNode {
877 private:
878 const MemNode::MemOrd _mem_ord;
879 public:
880 enum {
881 ExpectedIn = MemNode::ValueIn+1 // One more input than MemNode
882 };
883 CompareAndExchangeNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, MemNode::MemOrd mem_ord, const TypePtr* at, const Type* t) :
884 LoadStoreNode(c, mem, adr, val, at, t, 5), _mem_ord(mem_ord) {
885 init_req(ExpectedIn, ex );
886 }
887
888 MemNode::MemOrd order() const {
889 return _mem_ord;
890 }
891 virtual uint size_of() const { return sizeof(*this); }
892 };
893
894 //------------------------------CompareAndSwapBNode---------------------------
895 class CompareAndSwapBNode : public CompareAndSwapNode {
896 public:
897 CompareAndSwapBNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, MemNode::MemOrd mem_ord) : CompareAndSwapNode(c, mem, adr, val, ex, mem_ord) { }
898 virtual int Opcode() const;
899 };
900
901 //------------------------------CompareAndSwapSNode---------------------------
902 class CompareAndSwapSNode : public CompareAndSwapNode {
903 public:
904 CompareAndSwapSNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, MemNode::MemOrd mem_ord) : CompareAndSwapNode(c, mem, adr, val, ex, mem_ord) { }
905 virtual int Opcode() const;
906 };
907
908 //------------------------------CompareAndSwapINode---------------------------
909 class CompareAndSwapINode : public CompareAndSwapNode {
910 public:
911 CompareAndSwapINode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, MemNode::MemOrd mem_ord) : CompareAndSwapNode(c, mem, adr, val, ex, mem_ord) { }
912 virtual int Opcode() const;
913 };
914
915 //------------------------------CompareAndSwapLNode---------------------------
916 class CompareAndSwapLNode : public CompareAndSwapNode {
917 public:
918 CompareAndSwapLNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, MemNode::MemOrd mem_ord) : CompareAndSwapNode(c, mem, adr, val, ex, mem_ord) { }
919 virtual int Opcode() const;
920 };
921
922 //------------------------------CompareAndSwapPNode---------------------------
923 class CompareAndSwapPNode : public CompareAndSwapNode {
924 public:
925 CompareAndSwapPNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, MemNode::MemOrd mem_ord) : CompareAndSwapNode(c, mem, adr, val, ex, mem_ord) { }
926 virtual int Opcode() const;
927 };
928
929 //------------------------------CompareAndSwapNNode---------------------------
930 class CompareAndSwapNNode : public CompareAndSwapNode {
931 public:
932 CompareAndSwapNNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, MemNode::MemOrd mem_ord) : CompareAndSwapNode(c, mem, adr, val, ex, mem_ord) { }
933 virtual int Opcode() const;
934 };
935
936 //------------------------------WeakCompareAndSwapBNode---------------------------
937 class WeakCompareAndSwapBNode : public CompareAndSwapNode {
938 public:
939 WeakCompareAndSwapBNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, MemNode::MemOrd mem_ord) : CompareAndSwapNode(c, mem, adr, val, ex, mem_ord) { }
940 virtual int Opcode() const;
941 };
942
943 //------------------------------WeakCompareAndSwapSNode---------------------------
944 class WeakCompareAndSwapSNode : public CompareAndSwapNode {
945 public:
946 WeakCompareAndSwapSNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, MemNode::MemOrd mem_ord) : CompareAndSwapNode(c, mem, adr, val, ex, mem_ord) { }
947 virtual int Opcode() const;
948 };
949
950 //------------------------------WeakCompareAndSwapINode---------------------------
951 class WeakCompareAndSwapINode : public CompareAndSwapNode {
952 public:
953 WeakCompareAndSwapINode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, MemNode::MemOrd mem_ord) : CompareAndSwapNode(c, mem, adr, val, ex, mem_ord) { }
954 virtual int Opcode() const;
955 };
956
957 //------------------------------WeakCompareAndSwapLNode---------------------------
958 class WeakCompareAndSwapLNode : public CompareAndSwapNode {
959 public:
960 WeakCompareAndSwapLNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, MemNode::MemOrd mem_ord) : CompareAndSwapNode(c, mem, adr, val, ex, mem_ord) { }
961 virtual int Opcode() const;
962 };
963
964 //------------------------------WeakCompareAndSwapPNode---------------------------
965 class WeakCompareAndSwapPNode : public CompareAndSwapNode {
966 public:
967 WeakCompareAndSwapPNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, MemNode::MemOrd mem_ord) : CompareAndSwapNode(c, mem, adr, val, ex, mem_ord) { }
968 virtual int Opcode() const;
969 };
970
971 //------------------------------WeakCompareAndSwapNNode---------------------------
972 class WeakCompareAndSwapNNode : public CompareAndSwapNode {
973 public:
974 WeakCompareAndSwapNNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, MemNode::MemOrd mem_ord) : CompareAndSwapNode(c, mem, adr, val, ex, mem_ord) { }
975 virtual int Opcode() const;
976 };
977
978 //------------------------------CompareAndExchangeBNode---------------------------
979 class CompareAndExchangeBNode : public CompareAndExchangeNode {
980 public:
981 CompareAndExchangeBNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, const TypePtr* at, MemNode::MemOrd mem_ord) : CompareAndExchangeNode(c, mem, adr, val, ex, mem_ord, at, TypeInt::BYTE) { }
982 virtual int Opcode() const;
983 };
984
985
986 //------------------------------CompareAndExchangeSNode---------------------------
987 class CompareAndExchangeSNode : public CompareAndExchangeNode {
988 public:
989 CompareAndExchangeSNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, const TypePtr* at, MemNode::MemOrd mem_ord) : CompareAndExchangeNode(c, mem, adr, val, ex, mem_ord, at, TypeInt::SHORT) { }
990 virtual int Opcode() const;
991 };
992
993 //------------------------------CompareAndExchangeLNode---------------------------
994 class CompareAndExchangeLNode : public CompareAndExchangeNode {
995 public:
996 CompareAndExchangeLNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, const TypePtr* at, MemNode::MemOrd mem_ord) : CompareAndExchangeNode(c, mem, adr, val, ex, mem_ord, at, TypeLong::LONG) { }
997 virtual int Opcode() const;
998 };
999
1000
1001 //------------------------------CompareAndExchangeINode---------------------------
1002 class CompareAndExchangeINode : public CompareAndExchangeNode {
1003 public:
1004 CompareAndExchangeINode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, const TypePtr* at, MemNode::MemOrd mem_ord) : CompareAndExchangeNode(c, mem, adr, val, ex, mem_ord, at, TypeInt::INT) { }
1005 virtual int Opcode() const;
1006 };
1007
1008
1009 //------------------------------CompareAndExchangePNode---------------------------
1010 class CompareAndExchangePNode : public CompareAndExchangeNode {
1011 public:
1012 CompareAndExchangePNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, const TypePtr* at, const Type* t, MemNode::MemOrd mem_ord) : CompareAndExchangeNode(c, mem, adr, val, ex, mem_ord, at, t) { }
1013 virtual int Opcode() const;
1014 };
1015
1016 //------------------------------CompareAndExchangeNNode---------------------------
1017 class CompareAndExchangeNNode : public CompareAndExchangeNode {
1018 public:
1019 CompareAndExchangeNNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex, const TypePtr* at, const Type* t, MemNode::MemOrd mem_ord) : CompareAndExchangeNode(c, mem, adr, val, ex, mem_ord, at, t) { }
1020 virtual int Opcode() const;
1021 };
1022
1023 //------------------------------GetAndAddBNode---------------------------
1024 class GetAndAddBNode : public LoadStoreNode {
1025 public:
1026 GetAndAddBNode( Node *c, Node *mem, Node *adr, Node *val, const TypePtr* at ) : LoadStoreNode(c, mem, adr, val, at, TypeInt::BYTE, 4) { }
1027 virtual int Opcode() const;
1028 };
1029
1030 //------------------------------GetAndAddSNode---------------------------
1031 class GetAndAddSNode : public LoadStoreNode {
1032 public:
1033 GetAndAddSNode( Node *c, Node *mem, Node *adr, Node *val, const TypePtr* at ) : LoadStoreNode(c, mem, adr, val, at, TypeInt::SHORT, 4) { }
1034 virtual int Opcode() const;
1035 };
1036
1037 //------------------------------GetAndAddINode---------------------------
1038 class GetAndAddINode : public LoadStoreNode {
1039 public:
1040 GetAndAddINode( Node *c, Node *mem, Node *adr, Node *val, const TypePtr* at ) : LoadStoreNode(c, mem, adr, val, at, TypeInt::INT, 4) { }
1041 virtual int Opcode() const;
1042 };
1043
1044 //------------------------------GetAndAddLNode---------------------------
1045 class GetAndAddLNode : public LoadStoreNode {
1046 public:
1047 GetAndAddLNode( Node *c, Node *mem, Node *adr, Node *val, const TypePtr* at ) : LoadStoreNode(c, mem, adr, val, at, TypeLong::LONG, 4) { }
1048 virtual int Opcode() const;
1049 };
1050
1051 //------------------------------GetAndSetBNode---------------------------
1052 class GetAndSetBNode : public LoadStoreNode {
1053 public:
1054 GetAndSetBNode( Node *c, Node *mem, Node *adr, Node *val, const TypePtr* at ) : LoadStoreNode(c, mem, adr, val, at, TypeInt::BYTE, 4) { }
1055 virtual int Opcode() const;
1056 };
1057
1058 //------------------------------GetAndSetSNode---------------------------
1059 class GetAndSetSNode : public LoadStoreNode {
1060 public:
1061 GetAndSetSNode( Node *c, Node *mem, Node *adr, Node *val, const TypePtr* at ) : LoadStoreNode(c, mem, adr, val, at, TypeInt::SHORT, 4) { }
1062 virtual int Opcode() const;
1063 };
1064
1065 //------------------------------GetAndSetINode---------------------------
1066 class GetAndSetINode : public LoadStoreNode {
1067 public:
1068 GetAndSetINode( Node *c, Node *mem, Node *adr, Node *val, const TypePtr* at ) : LoadStoreNode(c, mem, adr, val, at, TypeInt::INT, 4) { }
1069 virtual int Opcode() const;
1070 };
1071
1072 //------------------------------GetAndSetLNode---------------------------
1073 class GetAndSetLNode : public LoadStoreNode {
1074 public:
1075 GetAndSetLNode( Node *c, Node *mem, Node *adr, Node *val, const TypePtr* at ) : LoadStoreNode(c, mem, adr, val, at, TypeLong::LONG, 4) { }
1076 virtual int Opcode() const;
1077 };
1078
1079 //------------------------------GetAndSetPNode---------------------------
1080 class GetAndSetPNode : public LoadStoreNode {
1081 public:
1082 GetAndSetPNode( Node *c, Node *mem, Node *adr, Node *val, const TypePtr* at, const Type* t ) : LoadStoreNode(c, mem, adr, val, at, t, 4) { }
1083 virtual int Opcode() const;
1084 };
1085
1086 //------------------------------GetAndSetNNode---------------------------
1087 class GetAndSetNNode : public LoadStoreNode {
1088 public:
1089 GetAndSetNNode( Node *c, Node *mem, Node *adr, Node *val, const TypePtr* at, const Type* t ) : LoadStoreNode(c, mem, adr, val, at, t, 4) { }
1090 virtual int Opcode() const;
1091 };
1092
1093 //------------------------------ClearArray-------------------------------------
1094 class ClearArrayNode: public Node {
1095 private:
1096 bool _is_large;
1097 bool _word_copy_only;
1098 public:
1099 ClearArrayNode( Node *ctrl, Node *arymem, Node *word_cnt, Node *base, Node* val, bool is_large)
1100 : Node(ctrl, arymem, word_cnt, base, val), _is_large(is_large),
1101 _word_copy_only(val->bottom_type()->isa_long() && (!val->bottom_type()->is_long()->is_con() || val->bottom_type()->is_long()->get_con() != 0)) {
1102 init_class_id(Class_ClearArray);
1103 }
1104 virtual int Opcode() const;
1105 virtual const Type *bottom_type() const { return Type::MEMORY; }
1106 // ClearArray modifies array elements, and so affects only the
1107 // array memory addressed by the bottom_type of its base address.
1108 virtual const class TypePtr *adr_type() const;
1109 virtual Node* Identity(PhaseGVN* phase);
1110 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
1111 virtual uint match_edge(uint idx) const;
1112 bool is_large() const { return _is_large; }
1113 bool word_copy_only() const { return _word_copy_only; }
1114
1115 // Clear the given area of an object or array.
1116 // The start offset must always be aligned mod BytesPerInt.
1117 // The end offset must always be aligned mod BytesPerLong.
1118 // Return the new memory.
1119 static Node* clear_memory(Node* control, Node* mem, Node* dest,
1120 Node* val,
1121 Node* raw_val,
1122 intptr_t start_offset,
1123 intptr_t end_offset,
1124 PhaseGVN* phase);
1125 static Node* clear_memory(Node* control, Node* mem, Node* dest,
1126 Node* val,
1127 Node* raw_val,
1128 intptr_t start_offset,
1129 Node* end_offset,
1130 PhaseGVN* phase);
1131 static Node* clear_memory(Node* control, Node* mem, Node* dest,
1132 Node* raw_val,
1133 Node* start_offset,
1134 Node* end_offset,
1135 PhaseGVN* phase);
1136 // Return allocation input memory edge if it is different instance
1137 // or itself if it is the one we are looking for.
1138 static bool step_through(Node** np, uint instance_id, PhaseValues* phase);
1139 };
1140
1141 //------------------------------MemBar-----------------------------------------
1142 // There are different flavors of Memory Barriers to match the Java Memory
1143 // Model. Monitor-enter and volatile-load act as Acquires: no following ref
1144 // can be moved to before them. We insert a MemBar-Acquire after a FastLock or
1145 // volatile-load. Monitor-exit and volatile-store act as Release: no
1146 // preceding ref can be moved to after them. We insert a MemBar-Release
1147 // before a FastUnlock or volatile-store. All volatiles need to be
1148 // serialized, so we follow all volatile-stores with a MemBar-Volatile to
1149 // separate it from any following volatile-load.
1150 class MemBarNode: public MultiNode {
1151 virtual uint hash() const ; // { return NO_HASH; }
1152 virtual bool cmp( const Node &n ) const ; // Always fail, except on self
1153
1154 virtual uint size_of() const { return sizeof(*this); }
1155 // Memory type this node is serializing. Usually either rawptr or bottom.
1156 const TypePtr* _adr_type;
1157
1158 // How is this membar related to a nearby memory access?
1159 enum {
1160 Standalone,
1161 TrailingLoad,
1162 TrailingStore,
1163 LeadingStore,
1164 TrailingLoadStore,
1165 LeadingLoadStore,
1166 TrailingPartialArrayCopy
1167 } _kind;
1168
1169 #ifdef ASSERT
1170 uint _pair_idx;
1171 #endif
1172
1173 public:
1174 enum {
1175 Precedent = TypeFunc::Parms // optional edge to force precedence
1176 };
1177 MemBarNode(Compile* C, int alias_idx, Node* precedent);
1178 virtual int Opcode() const = 0;
1179 virtual const class TypePtr *adr_type() const { return _adr_type; }
1180 virtual const Type* Value(PhaseGVN* phase) const;
1181 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
1182 virtual uint match_edge(uint idx) const { return 0; }
1183 virtual const Type *bottom_type() const { return TypeTuple::MEMBAR; }
1184 virtual Node *match(const ProjNode *proj, const Matcher *m, const RegMask* mask);
1185 // Factory method. Builds a wide or narrow membar.
1186 // Optional 'precedent' becomes an extra edge if not null.
1187 static MemBarNode* make(Compile* C, int opcode,
1188 int alias_idx = Compile::AliasIdxBot,
1189 Node* precedent = nullptr);
1190
1191 MemBarNode* trailing_membar() const;
1192 MemBarNode* leading_membar() const;
1193
1194 void set_trailing_load() { _kind = TrailingLoad; }
1195 bool trailing_load() const { return _kind == TrailingLoad; }
1196 bool trailing_store() const { return _kind == TrailingStore; }
1197 bool leading_store() const { return _kind == LeadingStore; }
1198 bool trailing_load_store() const { return _kind == TrailingLoadStore; }
1199 bool leading_load_store() const { return _kind == LeadingLoadStore; }
1200 bool trailing() const { return _kind == TrailingLoad || _kind == TrailingStore || _kind == TrailingLoadStore; }
1201 bool leading() const { return _kind == LeadingStore || _kind == LeadingLoadStore; }
1202 bool standalone() const { return _kind == Standalone; }
1203 void set_trailing_partial_array_copy() { _kind = TrailingPartialArrayCopy; }
1204 bool trailing_partial_array_copy() const { return _kind == TrailingPartialArrayCopy; }
1205
1206 static void set_store_pair(MemBarNode* leading, MemBarNode* trailing);
1207 static void set_load_store_pair(MemBarNode* leading, MemBarNode* trailing);
1208
1209 void remove(PhaseIterGVN *igvn);
1210 };
1211
1212 // "Acquire" - no following ref can move before (but earlier refs can
1213 // follow, like an early Load stalled in cache). Requires multi-cpu
1214 // visibility. Inserted after a volatile load.
1215 class MemBarAcquireNode: public MemBarNode {
1216 public:
1217 MemBarAcquireNode(Compile* C, int alias_idx, Node* precedent)
1218 : MemBarNode(C, alias_idx, precedent) {}
1219 virtual int Opcode() const;
1220 };
1221
1222 // "Acquire" - no following ref can move before (but earlier refs can
1223 // follow, like an early Load stalled in cache). Requires multi-cpu
1224 // visibility. Inserted independent of any load, as required
1225 // for intrinsic Unsafe.loadFence().
1226 class LoadFenceNode: public MemBarNode {
1227 public:
1228 LoadFenceNode(Compile* C, int alias_idx, Node* precedent)
1229 : MemBarNode(C, alias_idx, precedent) {}
1230 virtual int Opcode() const;
1231 };
1232
1233 // "Release" - no earlier ref can move after (but later refs can move
1234 // up, like a speculative pipelined cache-hitting Load). Requires
1235 // multi-cpu visibility. Inserted before a volatile store.
1236 class MemBarReleaseNode: public MemBarNode {
1237 public:
1238 MemBarReleaseNode(Compile* C, int alias_idx, Node* precedent)
1239 : MemBarNode(C, alias_idx, precedent) {}
1240 virtual int Opcode() const;
1241 };
1242
1243 // "Release" - no earlier ref can move after (but later refs can move
1244 // up, like a speculative pipelined cache-hitting Load). Requires
1245 // multi-cpu visibility. Inserted independent of any store, as required
1246 // for intrinsic Unsafe.storeFence().
1247 class StoreFenceNode: public MemBarNode {
1248 public:
1249 StoreFenceNode(Compile* C, int alias_idx, Node* precedent)
1250 : MemBarNode(C, alias_idx, precedent) {}
1251 virtual int Opcode() const;
1252 };
1253
1254 // "Acquire" - no following ref can move before (but earlier refs can
1255 // follow, like an early Load stalled in cache). Requires multi-cpu
1256 // visibility. Inserted after a FastLock.
1257 class MemBarAcquireLockNode: public MemBarNode {
1258 public:
1259 MemBarAcquireLockNode(Compile* C, int alias_idx, Node* precedent)
1260 : MemBarNode(C, alias_idx, precedent) {}
1261 virtual int Opcode() const;
1262 };
1263
1264 // "Release" - no earlier ref can move after (but later refs can move
1265 // up, like a speculative pipelined cache-hitting Load). Requires
1266 // multi-cpu visibility. Inserted before a FastUnLock.
1267 class MemBarReleaseLockNode: public MemBarNode {
1268 public:
1269 MemBarReleaseLockNode(Compile* C, int alias_idx, Node* precedent)
1270 : MemBarNode(C, alias_idx, precedent) {}
1271 virtual int Opcode() const;
1272 };
1273
1274 class MemBarStoreStoreNode: public MemBarNode {
1275 public:
1276 MemBarStoreStoreNode(Compile* C, int alias_idx, Node* precedent)
1277 : MemBarNode(C, alias_idx, precedent) {
1278 init_class_id(Class_MemBarStoreStore);
1279 }
1280 virtual int Opcode() const;
1281 };
1282
1283 class StoreStoreFenceNode: public MemBarNode {
1284 public:
1285 StoreStoreFenceNode(Compile* C, int alias_idx, Node* precedent)
1286 : MemBarNode(C, alias_idx, precedent) {}
1287 virtual int Opcode() const;
1288 };
1289
1290 // Ordering between a volatile store and a following volatile load.
1291 // Requires multi-CPU visibility?
1292 class MemBarVolatileNode: public MemBarNode {
1293 public:
1294 MemBarVolatileNode(Compile* C, int alias_idx, Node* precedent)
1295 : MemBarNode(C, alias_idx, precedent) {}
1296 virtual int Opcode() const;
1297 };
1298
1299 // Ordering within the same CPU. Used to order unsafe memory references
1300 // inside the compiler when we lack alias info. Not needed "outside" the
1301 // compiler because the CPU does all the ordering for us.
1302 class MemBarCPUOrderNode: public MemBarNode {
1303 public:
1304 MemBarCPUOrderNode(Compile* C, int alias_idx, Node* precedent)
1305 : MemBarNode(C, alias_idx, precedent) {}
1306 virtual int Opcode() const;
1307 virtual uint ideal_reg() const { return 0; } // not matched in the AD file
1308 };
1309
1310 class OnSpinWaitNode: public MemBarNode {
1311 public:
1312 OnSpinWaitNode(Compile* C, int alias_idx, Node* precedent)
1313 : MemBarNode(C, alias_idx, precedent) {}
1314 virtual int Opcode() const;
1315 };
1316
1317 // Isolation of object setup after an AllocateNode and before next safepoint.
1318 // (See comment in memnode.cpp near InitializeNode::InitializeNode for semantics.)
1319 class InitializeNode: public MemBarNode {
1320 friend class AllocateNode;
1321
1322 enum {
1323 Incomplete = 0,
1324 Complete = 1,
1325 WithArraycopy = 2
1326 };
1327 int _is_complete;
1328
1329 bool _does_not_escape;
1330
1331 public:
1332 enum {
1333 Control = TypeFunc::Control,
1334 Memory = TypeFunc::Memory, // MergeMem for states affected by this op
1335 RawAddress = TypeFunc::Parms+0, // the newly-allocated raw address
1336 RawStores = TypeFunc::Parms+1 // zero or more stores (or TOP)
1337 };
1338
1339 InitializeNode(Compile* C, int adr_type, Node* rawoop);
1340 virtual int Opcode() const;
1341 virtual uint size_of() const { return sizeof(*this); }
1342 virtual uint ideal_reg() const { return 0; } // not matched in the AD file
1343 virtual const RegMask &in_RegMask(uint) const; // mask for RawAddress
1344
1345 // Manage incoming memory edges via a MergeMem on in(Memory):
1346 Node* memory(uint alias_idx);
1347
1348 // The raw memory edge coming directly from the Allocation.
1349 // The contents of this memory are *always* all-zero-bits.
1350 Node* zero_memory() { return memory(Compile::AliasIdxRaw); }
1351
1352 // Return the corresponding allocation for this initialization (or null if none).
1353 // (Note: Both InitializeNode::allocation and AllocateNode::initialization
1354 // are defined in graphKit.cpp, which sets up the bidirectional relation.)
1355 AllocateNode* allocation();
1356
1357 // Anything other than zeroing in this init?
1358 bool is_non_zero();
1359
1360 // An InitializeNode must completed before macro expansion is done.
1361 // Completion requires that the AllocateNode must be followed by
1362 // initialization of the new memory to zero, then to any initializers.
1363 bool is_complete() { return _is_complete != Incomplete; }
1364 bool is_complete_with_arraycopy() { return (_is_complete & WithArraycopy) != 0; }
1365
1366 // Mark complete. (Must not yet be complete.)
1367 void set_complete(PhaseGVN* phase);
1368 void set_complete_with_arraycopy() { _is_complete = Complete | WithArraycopy; }
1369
1370 bool does_not_escape() { return _does_not_escape; }
1371 void set_does_not_escape() { _does_not_escape = true; }
1372
1373 #ifdef ASSERT
1374 // ensure all non-degenerate stores are ordered and non-overlapping
1375 bool stores_are_sane(PhaseValues* phase);
1376 #endif //ASSERT
1377
1378 // See if this store can be captured; return offset where it initializes.
1379 // Return 0 if the store cannot be moved (any sort of problem).
1380 intptr_t can_capture_store(StoreNode* st, PhaseGVN* phase, bool can_reshape);
1381
1382 // Capture another store; reformat it to write my internal raw memory.
1383 // Return the captured copy, else null if there is some sort of problem.
1384 Node* capture_store(StoreNode* st, intptr_t start, PhaseGVN* phase, bool can_reshape);
1385
1386 // Find captured store which corresponds to the range [start..start+size).
1387 // Return my own memory projection (meaning the initial zero bits)
1388 // if there is no such store. Return null if there is a problem.
1389 Node* find_captured_store(intptr_t start, int size_in_bytes, PhaseValues* phase);
1390
1391 // Called when the associated AllocateNode is expanded into CFG.
1392 Node* complete_stores(Node* rawctl, Node* rawmem, Node* rawptr,
1393 intptr_t header_size, Node* size_in_bytes,
1394 PhaseIterGVN* phase);
1395
1396 private:
1397 void remove_extra_zeroes();
1398
1399 // Find out where a captured store should be placed (or already is placed).
1400 int captured_store_insertion_point(intptr_t start, int size_in_bytes,
1401 PhaseValues* phase);
1402
1403 static intptr_t get_store_offset(Node* st, PhaseValues* phase);
1404
1405 Node* make_raw_address(intptr_t offset, PhaseGVN* phase);
1406
1407 bool detect_init_independence(Node* value, PhaseGVN* phase);
1408
1409 void coalesce_subword_stores(intptr_t header_size, Node* size_in_bytes,
1410 PhaseGVN* phase);
1411
1412 intptr_t find_next_fullword_store(uint i, PhaseGVN* phase);
1413 };
1414
1415 //------------------------------MergeMem---------------------------------------
1416 // (See comment in memnode.cpp near MergeMemNode::MergeMemNode for semantics.)
1417 class MergeMemNode: public Node {
1418 virtual uint hash() const ; // { return NO_HASH; }
1419 virtual bool cmp( const Node &n ) const ; // Always fail, except on self
1420 friend class MergeMemStream;
1421 MergeMemNode(Node* def); // clients use MergeMemNode::make
1422
1423 public:
1424 // If the input is a whole memory state, clone it with all its slices intact.
1425 // Otherwise, make a new memory state with just that base memory input.
1426 // In either case, the result is a newly created MergeMem.
1427 static MergeMemNode* make(Node* base_memory);
1428
1429 virtual int Opcode() const;
1430 virtual Node* Identity(PhaseGVN* phase);
1431 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
1432 virtual uint ideal_reg() const { return NotAMachineReg; }
1433 virtual uint match_edge(uint idx) const { return 0; }
1434 virtual const RegMask &out_RegMask() const;
1435 virtual const Type *bottom_type() const { return Type::MEMORY; }
1436 virtual const TypePtr *adr_type() const { return TypePtr::BOTTOM; }
1437 // sparse accessors
1438 // Fetch the previously stored "set_memory_at", or else the base memory.
1439 // (Caller should clone it if it is a phi-nest.)
1440 Node* memory_at(uint alias_idx) const;
1441 // set the memory, regardless of its previous value
1442 void set_memory_at(uint alias_idx, Node* n);
1443 // the "base" is the memory that provides the non-finite support
1444 Node* base_memory() const { return in(Compile::AliasIdxBot); }
1445 // warning: setting the base can implicitly set any of the other slices too
1446 void set_base_memory(Node* def);
1447 // sentinel value which denotes a copy of the base memory:
1448 Node* empty_memory() const { return in(Compile::AliasIdxTop); }
1449 static Node* make_empty_memory(); // where the sentinel comes from
1450 bool is_empty_memory(Node* n) const { assert((n == empty_memory()) == n->is_top(), "sanity"); return n->is_top(); }
1451 // hook for the iterator, to perform any necessary setup
1452 void iteration_setup(const MergeMemNode* other = nullptr);
1453 // push sentinels until I am at least as long as the other (semantic no-op)
1454 void grow_to_match(const MergeMemNode* other);
1455 bool verify_sparse() const PRODUCT_RETURN0;
1456 #ifndef PRODUCT
1457 virtual void dump_spec(outputStream *st) const;
1458 #endif
1459 };
1460
1461 class MergeMemStream : public StackObj {
1462 private:
1463 MergeMemNode* _mm;
1464 const MergeMemNode* _mm2; // optional second guy, contributes non-empty iterations
1465 Node* _mm_base; // loop-invariant base memory of _mm
1466 int _idx;
1467 int _cnt;
1468 Node* _mem;
1469 Node* _mem2;
1470 int _cnt2;
1471
1472 void init(MergeMemNode* mm, const MergeMemNode* mm2 = nullptr) {
1473 // subsume_node will break sparseness at times, whenever a memory slice
1474 // folds down to a copy of the base ("fat") memory. In such a case,
1475 // the raw edge will update to base, although it should be top.
1476 // This iterator will recognize either top or base_memory as an
1477 // "empty" slice. See is_empty, is_empty2, and next below.
1478 //
1479 // The sparseness property is repaired in MergeMemNode::Ideal.
1480 // As long as access to a MergeMem goes through this iterator
1481 // or the memory_at accessor, flaws in the sparseness will
1482 // never be observed.
1483 //
1484 // Also, iteration_setup repairs sparseness.
1485 assert(mm->verify_sparse(), "please, no dups of base");
1486 assert(mm2==nullptr || mm2->verify_sparse(), "please, no dups of base");
1487
1488 _mm = mm;
1489 _mm_base = mm->base_memory();
1490 _mm2 = mm2;
1491 _cnt = mm->req();
1492 _idx = Compile::AliasIdxBot-1; // start at the base memory
1493 _mem = nullptr;
1494 _mem2 = nullptr;
1495 }
1496
1497 #ifdef ASSERT
1498 Node* check_memory() const {
1499 if (at_base_memory())
1500 return _mm->base_memory();
1501 else if ((uint)_idx < _mm->req() && !_mm->in(_idx)->is_top())
1502 return _mm->memory_at(_idx);
1503 else
1504 return _mm_base;
1505 }
1506 Node* check_memory2() const {
1507 return at_base_memory()? _mm2->base_memory(): _mm2->memory_at(_idx);
1508 }
1509 #endif
1510
1511 static bool match_memory(Node* mem, const MergeMemNode* mm, int idx) PRODUCT_RETURN0;
1512 void assert_synch() const {
1513 assert(!_mem || _idx >= _cnt || match_memory(_mem, _mm, _idx),
1514 "no side-effects except through the stream");
1515 }
1516
1517 public:
1518
1519 // expected usages:
1520 // for (MergeMemStream mms(mem->is_MergeMem()); next_non_empty(); ) { ... }
1521 // for (MergeMemStream mms(mem1, mem2); next_non_empty2(); ) { ... }
1522
1523 // iterate over one merge
1524 MergeMemStream(MergeMemNode* mm) {
1525 mm->iteration_setup();
1526 init(mm);
1527 debug_only(_cnt2 = 999);
1528 }
1529 // iterate in parallel over two merges
1530 // only iterates through non-empty elements of mm2
1531 MergeMemStream(MergeMemNode* mm, const MergeMemNode* mm2) {
1532 assert(mm2, "second argument must be a MergeMem also");
1533 ((MergeMemNode*)mm2)->iteration_setup(); // update hidden state
1534 mm->iteration_setup(mm2);
1535 init(mm, mm2);
1536 _cnt2 = mm2->req();
1537 }
1538 #ifdef ASSERT
1539 ~MergeMemStream() {
1540 assert_synch();
1541 }
1542 #endif
1543
1544 MergeMemNode* all_memory() const {
1545 return _mm;
1546 }
1547 Node* base_memory() const {
1548 assert(_mm_base == _mm->base_memory(), "no update to base memory, please");
1549 return _mm_base;
1550 }
1551 const MergeMemNode* all_memory2() const {
1552 assert(_mm2 != nullptr, "");
1553 return _mm2;
1554 }
1555 bool at_base_memory() const {
1556 return _idx == Compile::AliasIdxBot;
1557 }
1558 int alias_idx() const {
1559 assert(_mem, "must call next 1st");
1560 return _idx;
1561 }
1562
1563 const TypePtr* adr_type() const {
1564 return Compile::current()->get_adr_type(alias_idx());
1565 }
1566
1567 const TypePtr* adr_type(Compile* C) const {
1568 return C->get_adr_type(alias_idx());
1569 }
1570 bool is_empty() const {
1571 assert(_mem, "must call next 1st");
1572 assert(_mem->is_top() == (_mem==_mm->empty_memory()), "correct sentinel");
1573 return _mem->is_top();
1574 }
1575 bool is_empty2() const {
1576 assert(_mem2, "must call next 1st");
1577 assert(_mem2->is_top() == (_mem2==_mm2->empty_memory()), "correct sentinel");
1578 return _mem2->is_top();
1579 }
1580 Node* memory() const {
1581 assert(!is_empty(), "must not be empty");
1582 assert_synch();
1583 return _mem;
1584 }
1585 // get the current memory, regardless of empty or non-empty status
1586 Node* force_memory() const {
1587 assert(!is_empty() || !at_base_memory(), "");
1588 // Use _mm_base to defend against updates to _mem->base_memory().
1589 Node *mem = _mem->is_top() ? _mm_base : _mem;
1590 assert(mem == check_memory(), "");
1591 return mem;
1592 }
1593 Node* memory2() const {
1594 assert(_mem2 == check_memory2(), "");
1595 return _mem2;
1596 }
1597 void set_memory(Node* mem) {
1598 if (at_base_memory()) {
1599 // Note that this does not change the invariant _mm_base.
1600 _mm->set_base_memory(mem);
1601 } else {
1602 _mm->set_memory_at(_idx, mem);
1603 }
1604 _mem = mem;
1605 assert_synch();
1606 }
1607
1608 // Recover from a side effect to the MergeMemNode.
1609 void set_memory() {
1610 _mem = _mm->in(_idx);
1611 }
1612
1613 bool next() { return next(false); }
1614 bool next2() { return next(true); }
1615
1616 bool next_non_empty() { return next_non_empty(false); }
1617 bool next_non_empty2() { return next_non_empty(true); }
1618 // next_non_empty2 can yield states where is_empty() is true
1619
1620 private:
1621 // find the next item, which might be empty
1622 bool next(bool have_mm2) {
1623 assert((_mm2 != nullptr) == have_mm2, "use other next");
1624 assert_synch();
1625 if (++_idx < _cnt) {
1626 // Note: This iterator allows _mm to be non-sparse.
1627 // It behaves the same whether _mem is top or base_memory.
1628 _mem = _mm->in(_idx);
1629 if (have_mm2)
1630 _mem2 = _mm2->in((_idx < _cnt2) ? _idx : Compile::AliasIdxTop);
1631 return true;
1632 }
1633 return false;
1634 }
1635
1636 // find the next non-empty item
1637 bool next_non_empty(bool have_mm2) {
1638 while (next(have_mm2)) {
1639 if (!is_empty()) {
1640 // make sure _mem2 is filled in sensibly
1641 if (have_mm2 && _mem2->is_top()) _mem2 = _mm2->base_memory();
1642 return true;
1643 } else if (have_mm2 && !is_empty2()) {
1644 return true; // is_empty() == true
1645 }
1646 }
1647 return false;
1648 }
1649 };
1650
1651 // cachewb node for guaranteeing writeback of the cache line at a
1652 // given address to (non-volatile) RAM
1653 class CacheWBNode : public Node {
1654 public:
1655 CacheWBNode(Node *ctrl, Node *mem, Node *addr) : Node(ctrl, mem, addr) {}
1656 virtual int Opcode() const;
1657 virtual uint ideal_reg() const { return NotAMachineReg; }
1658 virtual uint match_edge(uint idx) const { return (idx == 2); }
1659 virtual const TypePtr *adr_type() const { return TypePtr::BOTTOM; }
1660 virtual const Type *bottom_type() const { return Type::MEMORY; }
1661 };
1662
1663 // cachewb pre sync node for ensuring that writebacks are serialised
1664 // relative to preceding or following stores
1665 class CacheWBPreSyncNode : public Node {
1666 public:
1667 CacheWBPreSyncNode(Node *ctrl, Node *mem) : Node(ctrl, mem) {}
1668 virtual int Opcode() const;
1669 virtual uint ideal_reg() const { return NotAMachineReg; }
1670 virtual uint match_edge(uint idx) const { return false; }
1671 virtual const TypePtr *adr_type() const { return TypePtr::BOTTOM; }
1672 virtual const Type *bottom_type() const { return Type::MEMORY; }
1673 };
1674
1675 // cachewb pre sync node for ensuring that writebacks are serialised
1676 // relative to preceding or following stores
1677 class CacheWBPostSyncNode : public Node {
1678 public:
1679 CacheWBPostSyncNode(Node *ctrl, Node *mem) : Node(ctrl, mem) {}
1680 virtual int Opcode() const;
1681 virtual uint ideal_reg() const { return NotAMachineReg; }
1682 virtual uint match_edge(uint idx) const { return false; }
1683 virtual const TypePtr *adr_type() const { return TypePtr::BOTTOM; }
1684 virtual const Type *bottom_type() const { return Type::MEMORY; }
1685 };
1686
1687 //------------------------------Prefetch---------------------------------------
1688
1689 // Allocation prefetch which may fault, TLAB size have to be adjusted.
1690 class PrefetchAllocationNode : public Node {
1691 public:
1692 PrefetchAllocationNode(Node *mem, Node *adr) : Node(nullptr,mem,adr) {}
1693 virtual int Opcode() const;
1694 virtual uint ideal_reg() const { return NotAMachineReg; }
1695 virtual uint match_edge(uint idx) const { return idx==2; }
1696 virtual const Type *bottom_type() const { return ( AllocatePrefetchStyle == 3 ) ? Type::MEMORY : Type::ABIO; }
1697 };
1698
1699 #endif // SHARE_OPTO_MEMNODE_HPP