1 //===-- MachineFunctionPass.h - Pass for MachineFunctions --------*-C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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.
17 //===----------------------------------------------------------------------===//
19 #ifndef LLVM_CODEGEN_MACHINEFUNCTIONPASS_H
20 #define LLVM_CODEGEN_MACHINEFUNCTIONPASS_H
22 #include "llvm/Pass.h"
26 class MachineFunction;
28 /// MachineFunctionPass - This class adapts the FunctionPass interface to
29 /// allow convenient creation of passes that operate on the MachineFunction
30 /// representation. Instead of overriding runOnFunction, subclasses
31 /// override runOnMachineFunction.
32 class MachineFunctionPass : public FunctionPass {
34 explicit MachineFunctionPass(char &ID) : FunctionPass(ID) {}
36 /// runOnMachineFunction - This method must be overloaded to perform the
37 /// desired machine code transformation or analysis.
39 virtual bool runOnMachineFunction(MachineFunction &MF) = 0;
41 /// getAnalysisUsage - Subclasses that override getAnalysisUsage
44 /// For MachineFunctionPasses, calling AU.preservesCFG() indicates that
45 /// the pass does not modify the MachineBasicBlock CFG.
47 void getAnalysisUsage(AnalysisUsage &AU) const override;
50 /// createPrinterPass - Get a machine function printer pass.
51 Pass *createPrinterPass(raw_ostream &O,
52 const std::string &Banner) const override;
54 bool runOnFunction(Function &F) override;
57 } // End llvm namespace