1//===-- WinCFGuard.h - Windows Control Flow Guard Handling ----*- 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 contains support for writing the metadata for Windows Control Flow
10// Guard, including address-taken functions, and valid longjmp targets.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_WINCFGUARD_H
15#define LLVM_LIB_CODEGEN_ASMPRINTER_WINCFGUARD_H
16
17#include "llvm/CodeGen/AsmPrinterHandler.h"
18#include "llvm/Support/Compiler.h"
19#include <vector>
20
21namespace llvm {
22
23class LLVM_LIBRARY_VISIBILITY WinCFGuard : public AsmPrinterHandler {
24  /// Target of directive emission.
25  AsmPrinter *Asm;
26  std::vector<const MCSymbol *> LongjmpTargets;
27
28public:
29  WinCFGuard(AsmPrinter *A);
30  ~WinCFGuard() override;
31
32  void setSymbolSize(const MCSymbol *Sym, uint64_t Size) override {}
33
34  /// Emit the Control Flow Guard function ID table.
35  void endModule() override;
36
37  /// Gather pre-function debug information.
38  /// Every beginFunction(MF) call should be followed by an endFunction(MF)
39  /// call.
40  void beginFunction(const MachineFunction *MF) override {}
41
42  /// Gather post-function debug information.
43  /// Please note that some AsmPrinter implementations may not call
44  /// beginFunction at all.
45  void endFunction(const MachineFunction *MF) override;
46
47  /// Process beginning of an instruction.
48  void beginInstruction(const MachineInstr *MI) override {}
49
50  /// Process end of an instruction.
51  void endInstruction() override {}
52};
53
54} // namespace llvm
55
56#endif
57