llvm/lib/CodeGen/AsmPrinter/DwarfException.h

   1 //===-- DwarfException.h - Dwarf Exception Framework -----------*- C++ -*--===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file contains support for writing dwarf exception info into asm files.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DWARFEXCEPTION_H
  14 #define LLVM_LIB_CODEGEN_ASMPRINTER_DWARFEXCEPTION_H
  15
  16 #include "EHStreamer.h"
  17 #include "llvm/CodeGen/AsmPrinter.h"
  18 #include "llvm/MC/MCDwarf.h"
  19
  20 namespace llvm {
  21 class MachineFunction;
  22 class ARMTargetStreamer;
  23
  24 class LLVM_LIBRARY_VISIBILITY DwarfCFIException : public EHStreamer {
  25   /// Per-function flag to indicate if .cfi_personality should be emitted.
  26   bool shouldEmitPersonality = false;
  27
  28   /// Per-function flag to indicate if .cfi_personality must be emitted.
  29   bool forceEmitPersonality = false;
  30
  31   /// Per-function flag to indicate if .cfi_lsda should be emitted.
  32   bool shouldEmitLSDA = false;
  33
  34   /// Per-function flag to indicate if frame CFI info should be emitted.
  35   bool shouldEmitCFI = false;
  36
  37   /// Per-module flag to indicate if .cfi_section has beeen emitted.
  38   bool hasEmittedCFISections = false;
  39
  40   /// Vector of all personality functions seen so far in the module.
  41   std::vector<const GlobalValue *> Personalities;
  42
  43   void addPersonality(const GlobalValue *Personality);
  44
  45 public:
  46   //===--------------------------------------------------------------------===//
  47   // Main entry points.
  48   //
  49   DwarfCFIException(AsmPrinter *A);
  50   ~DwarfCFIException() override;
  51
  52   /// Emit all exception information that should come after the content.
  53   void endModule() override;
  54
  55   /// Gather pre-function exception information.  Assumes being emitted
  56   /// immediately after the function entry point.
  57   void beginFunction(const MachineFunction *MF) override;
  58
  59   /// Gather and emit post-function exception information.
  60   void endFunction(const MachineFunction *) override;
  61
  62   void beginBasicBlockSection(const MachineBasicBlock &MBB) override;
  63   void endBasicBlockSection(const MachineBasicBlock &MBB) override;
  64 };
  65
  66 class LLVM_LIBRARY_VISIBILITY ARMException : public EHStreamer {
  67   /// Per-function flag to indicate if frame CFI info should be emitted.
  68   bool shouldEmitCFI = false;
  69
  70   /// Per-module flag to indicate if .cfi_section has beeen emitted.
  71   bool hasEmittedCFISections = false;
  72
  73   void emitTypeInfos(unsigned TTypeEncoding, MCSymbol *TTBaseLabel) override;
  74   ARMTargetStreamer &getTargetStreamer();
  75
  76 public:
  77   //===--------------------------------------------------------------------===//
  78   // Main entry points.
  79   //
  80   ARMException(AsmPrinter *A);
  81   ~ARMException() override;
  82
  83   /// Emit all exception information that should come after the content.
  84   void endModule() override {}
  85
  86   /// Gather pre-function exception information.  Assumes being emitted
  87   /// immediately after the function entry point.
  88   void beginFunction(const MachineFunction *MF) override;
  89
  90   /// Gather and emit post-function exception information.
  91   void endFunction(const MachineFunction *) override;
  92
  93   void markFunctionEnd() override;
  94 };
  95
  96 class LLVM_LIBRARY_VISIBILITY AIXException : public EHStreamer {
  97   /// This is AIX's compat unwind section, which unwinder would use
  98   /// to find the location of LSDA area and personality rountine.
  99   void emitExceptionInfoTable(const MCSymbol *LSDA, const MCSymbol *PerSym);
 100
 101 public:
 102   AIXException(AsmPrinter *A);
 103
 104   void endModule() override {}
 105   void beginFunction(const MachineFunction *MF) override {}
 106   void endFunction(const MachineFunction *MF) override;
 107 };
 108 } // End of namespace llvm
 109
 110 #endif