LLVM  6.0.0svn
WinException.h
Go to the documentation of this file.
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  /// 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  //
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  /// \brief 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 
Instances of this class represent a uniqued identifier for a section in the current translation unit...
Definition: MCSection.h:39
Compute iterated dominance frontiers using a linear time algorithm.
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:77
#define LLVM_LIBRARY_VISIBILITY
LLVM_LIBRARY_VISIBILITY - If a class marked with this attribute is linked into a shared library...
Definition: Compiler.h:105
LLVM Value Representation.
Definition: Value.h:73
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49