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 class MCSection;
25 class Value;
26 struct WinEHFuncInfo;
27
backgroundThreads()28 class LLVM_LIBRARY_VISIBILITY WinException : public EHStreamer {
29 /// Per-function flag to indicate if personality info should be emitted.
30 bool shouldEmitPersonality = false;
31
32 /// Per-function flag to indicate if the LSDA should be emitted.
33 bool shouldEmitLSDA = false;
34
35 /// Per-function flag to indicate if frame moves info should be emitted.
36 bool shouldEmitMoves = false;
37
38 /// True if this is a 64-bit target and we should use image relative offsets.
39 bool useImageRel32 = false;
40
41 /// Pointer to the current funclet entry BB.
42 const MachineBasicBlock *CurrentFuncletEntry = nullptr;
43
44 /// The section of the last funclet start.
45 MCSection *CurrentFuncletTextSection = nullptr;
46
47 void emitCSpecificHandlerTable(const MachineFunction *MF);
48
49 void emitSEHActionsForRange(const WinEHFuncInfo &FuncInfo,
50 const MCSymbol *BeginLabel,
51 const MCSymbol *EndLabel, int State);
52
53 /// Emit the EH table data for 32-bit and 64-bit functions using
54 /// the __CxxFrameHandler3 personality.
55 void emitCXXFrameHandler3Table(const MachineFunction *MF);
56
57 /// Emit the EH table data for _except_handler3 and _except_handler4
58 /// personality functions. These are only used on 32-bit and do not use CFI
59 /// tables.
60 void emitExceptHandlerTable(const MachineFunction *MF);
61
62 void emitCLRExceptionTable(const MachineFunction *MF);
63
64 void computeIP2StateTable(
65 const MachineFunction *MF, const WinEHFuncInfo &FuncInfo,
66 SmallVectorImpl<std::pair<const MCExpr *, int>> &IPToStateTable);
67
68 /// Emits the label used with llvm.x86.seh.recoverfp, which is used by
69 /// outlined funclets.
70 void emitEHRegistrationOffsetLabel(const WinEHFuncInfo &FuncInfo,
71 StringRef FLinkageName);
72
73 const MCExpr *create32bitRef(const MCSymbol *Value);
74 const MCExpr *create32bitRef(const GlobalValue *GV);
75 const MCExpr *getLabelPlusOne(const MCSymbol *Label);
76 const MCExpr *getOffset(const MCSymbol *OffsetOf, const MCSymbol *OffsetFrom);
77 const MCExpr *getOffsetPlusOne(const MCSymbol *OffsetOf,
78 const MCSymbol *OffsetFrom);
79
80 /// Gets the offset that we should use in a table for a stack object with the
81 /// given index. For targets using CFI (Win64, etc), this is relative to the
82 /// established SP at the end of the prologue. For targets without CFI (Win32
83 /// only), it is relative to the frame pointer.
84 int getFrameIndexOffset(int FrameIndex, const WinEHFuncInfo &FuncInfo);
85
86 public:
87 //===--------------------------------------------------------------------===//
88 // Main entry points.
89 //
90 WinException(AsmPrinter *A);
91 ~WinException() override;
92
93 /// Emit all exception information that should come after the content.
94 void endModule() override;
95
96 /// Gather pre-function exception information. Assumes being emitted
97 /// immediately after the function entry point.
98 void beginFunction(const MachineFunction *MF) override;
99
100 /// Gather and emit post-function exception information.
101 void endFunction(const MachineFunction *) override;
102
103 /// Emit target-specific EH funclet machinery.
104 void beginFunclet(const MachineBasicBlock &MBB, MCSymbol *Sym) override;
105 void endFunclet() override;
106 };
107 }
108
109 #endif
110
111