1 //===-- WinException.h - Windows Exception Handling ----------*- 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 contains support for writing windows exception info into asm files.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_WIN64EXCEPTION_H
15 #define LLVM_LIB_CODEGEN_ASMPRINTER_WIN64EXCEPTION_H
16 
17 #include "EHStreamer.h"
18 
19 namespace llvm {
20 class Function;
21 class GlobalValue;
22 class MachineFunction;
23 class MCExpr;
24 struct WinEHFuncInfo;
25 
26 class WinException : public EHStreamer {
27   /// Per-function flag to indicate if personality info should be emitted.
28   bool shouldEmitPersonality = false;
29 
30   /// Per-function flag to indicate if the LSDA should be emitted.
31   bool shouldEmitLSDA = false;
32 
33   /// Per-function flag to indicate if frame moves info should be emitted.
34   bool shouldEmitMoves = false;
35 
36   /// True if this is a 64-bit target and we should use image relative offsets.
37   bool useImageRel32 = false;
38 
39   void emitCSpecificHandlerTable();
40 
41   /// Emit the EH table data for 32-bit and 64-bit functions using
42   /// the __CxxFrameHandler3 personality.
43   void emitCXXFrameHandler3Table(const MachineFunction *MF);
44 
45   /// Emit the EH table data for _except_handler3 and _except_handler4
46   /// personality functions. These are only used on 32-bit and do not use CFI
47   /// tables.
48   void emitExceptHandlerTable(const MachineFunction *MF);
49 
50   void extendIP2StateTable(const MachineFunction *MF, const Function *ParentF,
51                            WinEHFuncInfo &FuncInfo);
52 
53   const MCExpr *create32bitRef(const MCSymbol *Value);
54   const MCExpr *create32bitRef(const GlobalValue *GV);
55 
56 public:
57   //===--------------------------------------------------------------------===//
58   // Main entry points.
59   //
60   WinException(AsmPrinter *A);
61   ~WinException() override;
62 
63   /// Emit all exception information that should come after the content.
64   void endModule() override;
65 
66   /// Gather pre-function exception information.  Assumes being emitted
67   /// immediately after the function entry point.
68   void beginFunction(const MachineFunction *MF) override;
69 
70   /// Gather and emit post-function exception information.
71   void endFunction(const MachineFunction *) override;
72 };
73 }
74 
75 #endif
76 
77