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