EmptyISA.hpp

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// This file defines empty methods for the virtual functions in the
// ISA class.  This allows creating an instance of the ISA class that
// we don't actually use, but where a NULL object would cause other
// things to fail.
//
// For example, this is useful for the new platforms (power8/le and
// ARM) that have no ISA extension for their architecture.  For those
// platforms and whenever using the ParseAPI CFG support, binutils's
// LM class creates an ISA object but doesn't use it.
//
// The alternative would be to walk through the code and add #ifdef
// and tests for NULL as needed.  But this is probably simpler.

//***************************************************************************

#ifndef isa_EmptyISA_hpp
#define isa_EmptyISA_hpp

#include <include/gcc-attr.h>
#include <include/uint.h>

#include "ISA.hpp"

class EmptyISA : public ISA {
public:
  EmptyISA() { }

  virtual ~EmptyISA() { }

  virtual ushort
  getInsnSize(MachInsn* GCC_ATTR_UNUSED mi)
  { return 4; }

  virtual ushort
  getInsnNumOps(MachInsn* GCC_ATTR_UNUSED mi)
  { return 1; }

  virtual InsnDesc
  getInsnDesc(MachInsn* mi, ushort opIndex, ushort sz = 0)
  {
    ISA::InsnDesc d;
    return d;
  }

  virtual VMA
  getInsnTargetVMA(MachInsn* mi, VMA pc, ushort opIndex, ushort sz = 0)
  { return 0; }

  virtual ushort
  getInsnNumDelaySlots(MachInsn* mi, ushort opIndex, ushort sz = 0)
  { return 0; }

  virtual bool
  isParallelWithSuccessor(MachInsn* GCC_ATTR_UNUSED mi1,
                          ushort GCC_ATTR_UNUSED opIndex1,
                          ushort GCC_ATTR_UNUSED sz1,
                          MachInsn* GCC_ATTR_UNUSED mi2,
                          ushort GCC_ATTR_UNUSED opIndex2,
                          ushort GCC_ATTR_UNUSED sz2) const
  { return false; }

  virtual void
  decode(std::ostream& os, MachInsn* mi, VMA vma, ushort opIndex) { }
};

#endif  // isa_EmptyISA_hpp