1//===-- MachineFunctionPass.h - Pass for MachineFunctions --------*-C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file defines the MachineFunctionPass class. MachineFunctionPass's are
10// just FunctionPass's, except they operate on machine code as part of a code
11// generator. Because they operate on machine code, not the LLVM
12// representation, MachineFunctionPass's are not allowed to modify the LLVM
13// representation. Due to this limitation, the MachineFunctionPass class takes
14// care of declaring that no LLVM passes are invalidated.
15//
16//===----------------------------------------------------------------------===//
17
18#ifndef LLVM_CODEGEN_MACHINEFUNCTIONPASS_H
19#define LLVM_CODEGEN_MACHINEFUNCTIONPASS_H
20
21#include "llvm/CodeGen/MachineFunction.h"
22#include "llvm/Pass.h"
23
24namespace llvm {
25
26/// MachineFunctionPass - This class adapts the FunctionPass interface to
27/// allow convenient creation of passes that operate on the MachineFunction
28/// representation. Instead of overriding runOnFunction, subclasses
29/// override runOnMachineFunction.
30class MachineFunctionPass : public FunctionPass {
31public:
32 bool doInitialization(Module&) override {
33 // Cache the properties info at module-init time so we don't have to
34 // construct them for every function.
35 RequiredProperties = getRequiredProperties();
36 SetProperties = getSetProperties();
37 ClearedProperties = getClearedProperties();
38 return false;
39 }
40protected:
41 explicit MachineFunctionPass(char &ID) : FunctionPass(ID) {}
42
43 /// runOnMachineFunction - This method must be overloaded to perform the
44 /// desired machine code transformation or analysis.
45 ///
46 virtual bool runOnMachineFunction(MachineFunction &MF) = 0;
47
48 /// getAnalysisUsage - Subclasses that override getAnalysisUsage
49 /// must call this.
50 ///
51 /// For MachineFunctionPasses, calling AU.preservesCFG() indicates that
52 /// the pass does not modify the MachineBasicBlock CFG.
53 ///
54 void getAnalysisUsage(AnalysisUsage &AU) const override;
55
56 virtual MachineFunctionProperties getRequiredProperties() const {
57 return MachineFunctionProperties();
58 }
59 virtual MachineFunctionProperties getSetProperties() const {
60 return MachineFunctionProperties();
61 }
62 virtual MachineFunctionProperties getClearedProperties() const {
63 return MachineFunctionProperties();
64 }
65
66private:
67 MachineFunctionProperties RequiredProperties;
68 MachineFunctionProperties SetProperties;
69 MachineFunctionProperties ClearedProperties;
70
71 /// createPrinterPass - Get a machine function printer pass.
72 Pass *createPrinterPass(raw_ostream &O,
73 const std::string &Banner) const override;
74
75 bool runOnFunction(Function &F) override;
76};
77
78} // End llvm namespace
79
80#endif
81

source code of llvm/include/llvm/CodeGen/MachineFunctionPass.h