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//===-- llvm/CodeGen/MachineLocation.h --------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by James M. Laskey and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// The MachineLocation class is used to represent a simple location in a machine
// frame. Locations will be one of two forms; a register or an address formed
// from a base address plus an offset. Register indirection can be specified by
// using an offset of zero.
//
// The MachineMove class is used to represent abstract move operations in the
// prolog/epilog of a compiled function. A collection of these objects can be
// used by a debug consumer to track the location of values when unwinding stack
// frames.
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_MACHINELOCATION_H
#define LLVM_CODEGEN_MACHINELOCATION_H
namespace llvm {
class MachineLocation {
private:
bool IsRegister; // True if location is a register.
unsigned Register; // gcc/gdb register number.
int Offset; // Displacement if not register.
public:
enum {
// The target register number for an abstract frame pointer. The value is
// an arbitrary value greater than MRegisterInfo::FirstVirtualRegister.
VirtualFP = ~0U
};
MachineLocation()
: IsRegister(false)
, Register(0)
, Offset(0)
{}
explicit MachineLocation(unsigned R)
: IsRegister(true)
, Register(R)
, Offset(0)
{}
MachineLocation(unsigned R, int O)
: IsRegister(false)
, Register(R)
, Offset(O)
{}
// Accessors
bool isRegister() const { return IsRegister; }
unsigned getRegister() const { return Register; }
int getOffset() const { return Offset; }
void setIsRegister(bool Is) { IsRegister = Is; }
void setRegister(unsigned R) { Register = R; }
void setOffset(int O) { Offset = O; }
void set(unsigned R) {
IsRegister = true;
Register = R;
Offset = 0;
}
void set(unsigned R, int O) {
IsRegister = false;
Register = R;
Offset = O;
}
#ifndef NDEBUG
void dump();
#endif
};
class MachineMove {
private:
unsigned LabelID; // Label ID number for post-instruction
// address when result of move takes
// effect.
MachineLocation Destination; // Move to location.
MachineLocation Source; // Move from location.
public:
MachineMove()
: LabelID(0)
, Destination()
, Source()
{}
MachineMove(unsigned ID, MachineLocation &D, MachineLocation &S)
: LabelID(ID)
, Destination(D)
, Source(S)
{}
// Accessors
unsigned getLabelID() const { return LabelID; }
const MachineLocation &getDestination() const { return Destination; }
const MachineLocation &getSource() const { return Source; }
};
} // End llvm namespace
#endif
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