regAlloc.hpp

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/* Copyright 1994 - 1996, LongView Technologies L.L.C. $Revision: 1.13 $ */
/* Copyright (c) 2006, Sun Microsystems, Inc.
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// register allocator for the Compiler
// currently a simple usage count thing

# ifdef DELTA_COMPILER

class RegisterAllocator;
extern RegisterAllocator* theAllocator;

class RegisterAllocator : public ResourceObj {
 private:
  IntFreeList*          _stackLocs;

 public:
  RegisterAllocator();

  void preAllocate(PReg* r);
  void allocate(GrowableArray<PReg*>* globals);
  bool allocateConst(ConstPReg* r, Location preferred = unAllocated);
  int  nofStackTemps()  { return _stackLocs->length(); }
};

  
// helper structure for local register allocation
class RegCandidate : public ResourceObj{
 public:
  PReg* r;              // preg to be allocated
  Location loc;         // possible location for it
  int ndefs;            // required # defs of loc

  RegCandidate(PReg* reg, Location l, int n) { r = reg; loc = l; ndefs = n; }
};

class RegisterEqClass : public ResourceObj {
 public:
  // holds pregs belonging to equivalence class
  // PRegs are linked through regClassLink
  PReg* first;
  PReg* last;
   
  RegisterEqClass(PReg* f);
  void append(PReg* other);
};

# endif

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