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 DwarfCFIExceptionBase : public EHStreamer {
  25 protected:
  26   DwarfCFIExceptionBase(AsmPrinter *A);
  27
  28   /// Per-function flag to indicate if frame CFI info should be emitted.
  29   bool shouldEmitCFI;
  30   /// Per-module flag to indicate if .cfi_section has beeen emitted.
  31   bool hasEmittedCFISections;
  32
  33   void markFunctionEnd() override;
  34   void endFragment() override;
  35 };
  36
  37 class LLVM_LIBRARY_VISIBILITY DwarfCFIException : public DwarfCFIExceptionBase {
  38   /// Per-function flag to indicate if .cfi_personality should be emitted.
  39   bool shouldEmitPersonality;
  40
  41   /// Per-function flag to indicate if .cfi_personality must be emitted.
  42   bool forceEmitPersonality;
  43
  44   /// Per-function flag to indicate if .cfi_lsda should be emitted.
  45   bool shouldEmitLSDA;
  46
  47   /// Per-function flag to indicate if frame moves info should be emitted.
  48   bool shouldEmitMoves;
  49
  50 public:
  51   //===--------------------------------------------------------------------===//
  52   // Main entry points.
  53   //
  54   DwarfCFIException(AsmPrinter *A);
  55   ~DwarfCFIException() override;
  56
  57   /// Emit all exception information that should come after the content.
  58   void endModule() override;
  59
  60   /// Gather pre-function exception information.  Assumes being emitted
  61   /// immediately after the function entry point.
  62   void beginFunction(const MachineFunction *MF) override;
  63
  64   /// Gather and emit post-function exception information.
  65   void endFunction(const MachineFunction *) override;
  66
  67   void beginFragment(const MachineBasicBlock *MBB,
  68                      ExceptionSymbolProvider ESP) override;
  69 };
  70
  71 class LLVM_LIBRARY_VISIBILITY ARMException : public DwarfCFIExceptionBase {
  72   void emitTypeInfos(unsigned TTypeEncoding, MCSymbol *TTBaseLabel) override;
  73   ARMTargetStreamer &getTargetStreamer();
  74
  75 public:
  76   //===--------------------------------------------------------------------===//
  77   // Main entry points.
  78   //
  79   ARMException(AsmPrinter *A);
  80   ~ARMException() override;
  81
  82   /// Emit all exception information that should come after the content.
  83   void endModule() override {}
  84
  85   /// Gather pre-function exception information.  Assumes being emitted
  86   /// immediately after the function entry point.
  87   void beginFunction(const MachineFunction *MF) override;
  88
  89   /// Gather and emit post-function exception information.
  90   void endFunction(const MachineFunction *) override;
  91 };
  92 } // End of namespace llvm
  93
  94 #endif