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 MCSymbol *lookupImpSymbol(const MCSymbol *Sym);
28
29public:
30 WinCFGuard(AsmPrinter *A);
31 ~WinCFGuard() override;
32
33 void setSymbolSize(const MCSymbol *Sym, uint64_t Size) override {}
34
35 /// Emit the Control Flow Guard function ID table.
36 void endModule() override;
37
38 /// Gather pre-function debug information.
39 /// Every beginFunction(MF) call should be followed by an endFunction(MF)
40 /// call.
41 void beginFunction(const MachineFunction *MF) override {}
42
43 /// Gather post-function debug information.
44 /// Please note that some AsmPrinter implementations may not call
45 /// beginFunction at all.
46 void endFunction(const MachineFunction *MF) override;
47
48 /// Process beginning of an instruction.
49 void beginInstruction(const MachineInstr *MI) override {}
50
51 /// Process end of an instruction.
52 void endInstruction() override {}
53};
54
55} // namespace llvm
56
57#endif
58

source code of llvm/lib/CodeGen/AsmPrinter/WinCFGuard.h