src/share/vm/opto/castnode.hpp

rev 7063 : 8054478: C2: Incorrectly compiled char[] array access crashes JVM
Summary: propagate node replacements along control flow edges to callers
Reviewed-by: dead backbranch in main loop results in erroneous array access

*** 46,59 ****
  };
  
  //------------------------------CastIINode-------------------------------------
  // cast integer to integer (different range)
  class CastIINode: public ConstraintCastNode {
    public:
!   CastIINode (Node *n, const Type *t ): ConstraintCastNode(n,t) {}
    virtual int Opcode() const;
    virtual uint ideal_reg() const { return Op_RegI; }
  };
  
  //------------------------------CastPPNode-------------------------------------
  // cast pointer to pointer (different type)
  class CastPPNode: public ConstraintCastNode {
--- 46,72 ----
  };
  
  //------------------------------CastIINode-------------------------------------
  // cast integer to integer (different range)
  class CastIINode: public ConstraintCastNode {
+   private:
+   // Can this node be removed post CCP or does it carry a required dependency?
+   const bool _required;
+   // Is the type of this CastII the best we can do or do we expect to
+   // improve it later on and so we shouldn't optimize it out?
+   const bool _inexact;
    public:
!   CastIINode(Node *n, const Type *t, bool required = false, bool inexact = false)
!     : ConstraintCastNode(n,t), _required(required), _inexact(inexact) {}
    virtual int Opcode() const;
    virtual uint ideal_reg() const { return Op_RegI; }
+   virtual Node *Identity( PhaseTransform *phase );
+   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
+   virtual Node *Ideal_DU_postCCP( PhaseCCP * );
+ #ifndef PRODUCT
+   virtual void dump_spec(outputStream *st) const;
+ #endif
  };
  
  //------------------------------CastPPNode-------------------------------------
  // cast pointer to pointer (different type)
  class CastPPNode: public ConstraintCastNode {