defUse.hpp

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/* Copyright 1994, LongView Technologies L.L.C. $Revision: 1.11 $ */
/* Copyright (c) 2006, Sun Microsystems, Inc.
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// Defs represent PReg definitions, Uses the uses.  Each basic block
// has a list of the defs and uses it contains, and a PReg has a list
// of the BBs it is used/defined in.

# ifdef DELTA_COMPILER

  class DefUse : public PrintableResourceObj {          // abstract
   public:
    NonTrivialNode* node;
    DefUse(NonTrivialNode* n) { node = n; }

  };

  class Def : public DefUse {
   public:
    Def(NonTrivialNode* n) : DefUse(n) { }

    void print();
  };

  class Use : public DefUse {
   public:
    Use(NonTrivialNode* n) : DefUse(n) { }
    virtual bool isSoft() const         { return false; }
    void print();
  };

  class PSoftUse : public Use {
    // a debugger-related use; doesn't prevent block elimination
   public:
    PSoftUse(NonTrivialNode* n) : Use(n) { }
    bool isSoft() const         { return true; }
    void print();
  };

  class DUInfo : public PrintableResourceObj {// represents PReg's defs/uses within BB
   public:
    PReg* reg;
    SList<Use*> uses;   // uses (in order of nodes within BB)
    SList<Def*> defs;
    DUInfo(PReg* r) { reg = r; }

    void getLiveRange(int& firstNodeID, int& lastNodeId);
    void propagateTo(BB* bb, const PReg* r, const Def* def, Use* use, const bool global);
    void propagateTo(BB* useBB, Use* use, const NonTrivialNode* fromNode, PReg* src,
                     NonTrivialNode* toNode, const bool global);
    void print_short();
    void print();
  };

  class DUInfoList;

  // a BBDUTable contains all defs and uses of a BB
  class BBDUTable : public PrintableResourceObj {       
   public:
    GrowableArray<DUInfo*>* info;               // one element per PReg used/defd
    BBDUTable() { info = NULL; }

    void print_short() { lprintf("BBDUTable %#lx", this); }
    void print();    
  };

  // a PRegBBIndex is an index into a particular element of a BBDUTable
  class PRegBBIndex : public PrintableResourceObj {
   public:
    BB* bb;             // BB containing some of PReg's defs/uses
    int index;          // index into BB's BBDUTable

    PRegBBIndex(BB* b, int i, PReg* pr) { Unused(pr);  bb = b; index = i; }
    void print_short();
    void print();
  };

  class CPInfo : public PrintableResourceObj {
    // keeps track of effects of copy propagation
   public:                      // (for debugging info)
    NonTrivialNode* def;        // eliminated definition
    PReg* r;                    // equivalent PReg

    CPInfo(NonTrivialNode* d, PReg* r1) { def = d; r = r1; }
    bool isConstant() const;
    oop  constant() const;
    void print();
   protected:
    CPInfo(NonTrivialNode* def);
    friend CPInfo* new_CPInfo(NonTrivialNode* def);
  };

  CPInfo* new_CPInfo(NonTrivialNode* def); // may return NULL if def isn't suitable
  void forAllDefsDo(const GrowableArray<PRegBBIndex*>* l, Closure<Def*>* f);
  void forAllUsesDo(const GrowableArray<PRegBBIndex*>* l, Closure<Use*>* f);
  void printDefsAndUses(const GrowableArray<PRegBBIndex*>* l);  // for debugging
# endif

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