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comparison src/share/vm/opto/memnode.hpp @ 20804:7848fc12602b

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Merge with jdk8u40-b25
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Tue, 07 Apr 2015 14:58:49 +0200
parents 52b4284cb496 e7b3d177adda
children
comparison
equal deleted inserted replaced
20184:84105dcdb05b 20804:7848fc12602b
146 const MemOrd _mo; 146 const MemOrd _mo;
147 147
148 protected: 148 protected:
149 virtual uint cmp(const Node &n) const; 149 virtual uint cmp(const Node &n) const;
150 virtual uint size_of() const; // Size is bigger 150 virtual uint size_of() const; // Size is bigger
151 // Should LoadNode::Ideal() attempt to remove control edges?
152 virtual bool can_remove_control() const;
151 const Type* const _type; // What kind of value is loaded? 153 const Type* const _type; // What kind of value is loaded?
152 public: 154 public:
153 155
154 LoadNode(Node *c, Node *mem, Node *adr, const TypePtr* at, const Type *rt, MemOrd mo) 156 LoadNode(Node *c, Node *mem, Node *adr, const TypePtr* at, const Type *rt, MemOrd mo)
155 : MemNode(c,mem,adr,at), _type(rt), _mo(mo) { 157 : MemNode(c,mem,adr,at), _type(rt), _mo(mo) {
169 171
170 // Handle algebraic identities here. If we have an identity, return the Node 172 // Handle algebraic identities here. If we have an identity, return the Node
171 // we are equivalent to. We look for Load of a Store. 173 // we are equivalent to. We look for Load of a Store.
172 virtual Node *Identity( PhaseTransform *phase ); 174 virtual Node *Identity( PhaseTransform *phase );
173 175
174 // If the load is from Field memory and the pointer is non-null, we can 176 // If the load is from Field memory and the pointer is non-null, it might be possible to
175 // zero out the control input. 177 // zero out the control input.
178 // If the offset is constant and the base is an object allocation,
179 // try to hook me up to the exact initializing store.
176 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 180 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
177 181
178 // Split instance field load through Phi. 182 // Split instance field load through Phi.
179 Node* split_through_phi(PhaseGVN *phase); 183 Node* split_through_phi(PhaseGVN *phase);
180 184
411 }; 415 };
412 416
413 //------------------------------LoadKlassNode---------------------------------- 417 //------------------------------LoadKlassNode----------------------------------
414 // Load a Klass from an object 418 // Load a Klass from an object
415 class LoadKlassNode : public LoadPNode { 419 class LoadKlassNode : public LoadPNode {
420 protected:
421 // In most cases, LoadKlassNode does not have the control input set. If the control
422 // input is set, it must not be removed (by LoadNode::Ideal()).
423 virtual bool can_remove_control() const;
416 public: 424 public:
417 LoadKlassNode(Node *c, Node *mem, Node *adr, const TypePtr *at, const TypeKlassPtr *tk, MemOrd mo) 425 LoadKlassNode(Node *c, Node *mem, Node *adr, const TypePtr *at, const TypeKlassPtr *tk, MemOrd mo)
418 : LoadPNode(c, mem, adr, at, tk, mo) {} 426 : LoadPNode(c, mem, adr, at, tk, mo) {}
419 virtual int Opcode() const; 427 virtual int Opcode() const;
420 virtual const Type *Value( PhaseTransform *phase ) const; 428 virtual const Type *Value( PhaseTransform *phase ) const;
421 virtual Node *Identity( PhaseTransform *phase ); 429 virtual Node *Identity( PhaseTransform *phase );
422 virtual bool depends_only_on_test() const { return true; } 430 virtual bool depends_only_on_test() const { return true; }
423 431
424 // Polymorphic factory method: 432 // Polymorphic factory method:
425 static Node* make( PhaseGVN& gvn, Node *mem, Node *adr, const TypePtr* at, 433 static Node* make(PhaseGVN& gvn, Node* ctl, Node* mem, Node* adr, const TypePtr* at,
426 const TypeKlassPtr *tk = TypeKlassPtr::OBJECT ); 434 const TypeKlassPtr* tk = TypeKlassPtr::OBJECT);
427 }; 435 };
428 436
429 //------------------------------LoadNKlassNode--------------------------------- 437 //------------------------------LoadNKlassNode---------------------------------
430 // Load a narrow Klass from an object. 438 // Load a narrow Klass from an object.
431 class LoadNKlassNode : public LoadNNode { 439 class LoadNKlassNode : public LoadNNode {