MachineFunctionPass.h revision 7ed47a13356daed2a34cd2209a31f92552e3bdd8 
1//===-- MachineFunctionPass.h - Pass for MachineFunctions --------*-C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file defines the MachineFunctionPass class.  MachineFunctionPass's are
11// just FunctionPass's, except they operate on machine code as part of a code
12// generator.  Because they operate on machine code, not the LLVM
13// representation, MachineFunctionPass's are not allowed to modify the LLVM
14// representation.  Due to this limitation, the MachineFunctionPass class takes
15// care of declaring that no LLVM passes are invalidated.
16//
17//===----------------------------------------------------------------------===//
18
19#ifndef LLVM_CODEGEN_MACHINE_FUNCTION_PASS_H
20#define LLVM_CODEGEN_MACHINE_FUNCTION_PASS_H
21
22#include "llvm/Pass.h"
23#include "llvm/CodeGen/MachineFunction.h"
24
25namespace llvm {
26
27struct MachineFunctionPass : public FunctionPass {
28
29  explicit MachineFunctionPass(intptr_t ID) : FunctionPass(ID) {}
30
31protected:
32  /// runOnMachineFunction - This method must be overloaded to perform the
33  /// desired machine code transformation or analysis.
34  ///
35  virtual bool runOnMachineFunction(MachineFunction &MF) = 0;
36
37public:
38  // FIXME: This pass should declare that the pass does not invalidate any LLVM
39  // passes.
40  bool runOnFunction(Function &F) {
41    return runOnMachineFunction(MachineFunction::get(&F));
42  }
43
44private:
45  virtual void virtfn();  // out of line virtual fn to give class a home.
46};
47
48} // End llvm namespace
49
50#endif
51