LLVM  8.0.0svn
WinException.h
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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 
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  /// True if we are generating exception handling on Windows for ARM64.
42  bool isAArch64 = false;
43 
44  /// Pointer to the current funclet entry BB.
45  const MachineBasicBlock *CurrentFuncletEntry = nullptr;
46 
47  /// The section of the last funclet start.
48  MCSection *CurrentFuncletTextSection = nullptr;
49 
50  void emitCSpecificHandlerTable(const MachineFunction *MF);
51 
52  void emitSEHActionsForRange(const WinEHFuncInfo &FuncInfo,
53  const MCSymbol *BeginLabel,
54  const MCSymbol *EndLabel, int State);
55 
56  /// Emit the EH table data for 32-bit and 64-bit functions using
57  /// the __CxxFrameHandler3 personality.
58  void emitCXXFrameHandler3Table(const MachineFunction *MF);
59 
60  /// Emit the EH table data for _except_handler3 and _except_handler4
61  /// personality functions. These are only used on 32-bit and do not use CFI
62  /// tables.
63  void emitExceptHandlerTable(const MachineFunction *MF);
64 
65  void emitCLRExceptionTable(const MachineFunction *MF);
66 
67  void computeIP2StateTable(
68  const MachineFunction *MF, const WinEHFuncInfo &FuncInfo,
69  SmallVectorImpl<std::pair<const MCExpr *, int>> &IPToStateTable);
70 
71  /// Emits the label used with llvm.x86.seh.recoverfp, which is used by
72  /// outlined funclets.
73  void emitEHRegistrationOffsetLabel(const WinEHFuncInfo &FuncInfo,
74  StringRef FLinkageName);
75 
76  const MCExpr *create32bitRef(const MCSymbol *Value);
77  const MCExpr *create32bitRef(const GlobalValue *GV);
78  const MCExpr *getLabel(const MCSymbol *Label);
79  const MCExpr *getOffset(const MCSymbol *OffsetOf, const MCSymbol *OffsetFrom);
80  const MCExpr *getOffsetPlusOne(const MCSymbol *OffsetOf,
81  const MCSymbol *OffsetFrom);
82 
83  /// Gets the offset that we should use in a table for a stack object with the
84  /// given index. For targets using CFI (Win64, etc), this is relative to the
85  /// established SP at the end of the prologue. For targets without CFI (Win32
86  /// only), it is relative to the frame pointer.
87  int getFrameIndexOffset(int FrameIndex, const WinEHFuncInfo &FuncInfo);
88 
89 public:
90  //===--------------------------------------------------------------------===//
91  // Main entry points.
92  //
94  ~WinException() override;
95 
96  /// Emit all exception information that should come after the content.
97  void endModule() override;
98 
99  /// Gather pre-function exception information. Assumes being emitted
100  /// immediately after the function entry point.
101  void beginFunction(const MachineFunction *MF) override;
102 
103  /// Gather and emit post-function exception information.
104  void endFunction(const MachineFunction *) override;
105 
106  /// Emit target-specific EH funclet machinery.
107  void beginFunclet(const MachineBasicBlock &MBB, MCSymbol *Sym) override;
108  void endFunclet() override;
109 };
110 }
111 
112 #endif
113 
Instances of this class represent a uniqued identifier for a section in the current translation unit...
Definition: MCSection.h:39
This class represents lattice values for constants.
Definition: AllocatorList.h:24
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:42
Emits exception handling directives.
Definition: EHStreamer.h:31
This class consists of common code factored out of the SmallVector class to reduce code duplication b...
Definition: APFloat.h:42
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:36
static Error getOffset(const SymbolRef &Sym, SectionRef Sec, uint64_t &Result)
This class is intended to be used as a driving class for all asm writers.
Definition: AsmPrinter.h:79
#define LLVM_LIBRARY_VISIBILITY
LLVM_LIBRARY_VISIBILITY - If a class marked with this attribute is linked into a shared library...
Definition: Compiler.h:108
LLVM Value Representation.
Definition: Value.h:73
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49