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//===-- MachineFunctionPass.h - Pass for MachineFunctions --------*-C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the MachineFunctionPass class.  MachineFunctionPass's are
// just FunctionPass's, except they operate on machine code as part of a code
// generator.  Because they operate on machine code, not the LLVM
// representation, MachineFunctionPass's are not allowed to modify the LLVM
// representation.  Due to this limitation, the MachineFunctionPass class takes
// care of declaring that no LLVM passes are invalidated.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_MACHINE_FUNCTION_PASS_H
#define LLVM_CODEGEN_MACHINE_FUNCTION_PASS_H

#include "llvm/Pass.h"
#include "llvm/CodeGen/MachineFunction.h"

namespace llvm {

struct MachineFunctionPass : public FunctionPass {

  explicit MachineFunctionPass(intptr_t ID) : FunctionPass(ID) {}
  explicit MachineFunctionPass(void *ID) : FunctionPass(ID) {}

protected:
  /// runOnMachineFunction - This method must be overloaded to perform the
  /// desired machine code transformation or analysis.
  ///
  virtual bool runOnMachineFunction(MachineFunction &MF) = 0;

public:
  // FIXME: This pass should declare that the pass does not invalidate any LLVM
  // passes.
  bool runOnFunction(Function &F) {
    return runOnMachineFunction(MachineFunction::get(&F));
  }
  
private:
  virtual void virtfn();  // out of line virtual fn to give class a home.
};

} // End llvm namespace

#endif