llvm/lib/Target/AArch64/MCTargetDesc/AArch64TargetStreamer.h

   1 //===-- AArch64TargetStreamer.h - AArch64 Target Streamer ------*- 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 #ifndef LLVM_LIB_TARGET_AARCH64_MCTARGETDESC_AARCH64TARGETSTREAMER_H
  10 #define LLVM_LIB_TARGET_AARCH64_MCTARGETDESC_AARCH64TARGETSTREAMER_H
  11
  12 #include "llvm/MC/MCStreamer.h"
  13
  14 namespace {
  15 class AArch64ELFStreamer;
  16 }
  17
  18 namespace llvm {
  19
  20 class AArch64TargetStreamer : public MCTargetStreamer {
  21 public:
  22   AArch64TargetStreamer(MCStreamer &S);
  23   ~AArch64TargetStreamer() override;
  24
  25   void finish() override;
  26   void emitConstantPools() override;
  27
  28   /// Callback used to implement the ldr= pseudo.
  29   /// Add a new entry to the constant pool for the current section and return an
  30   /// MCExpr that can be used to refer to the constant pool location.
  31   const MCExpr *addConstantPoolEntry(const MCExpr *, unsigned Size, SMLoc Loc);
  32
  33   /// Callback used to implemnt the .ltorg directive.
  34   /// Emit contents of constant pool for the current section.
  35   void emitCurrentConstantPool();
  36
  37   /// Callback used to implement the .note.gnu.property section.
  38   void emitNoteSection(unsigned Flags);
  39
  40   /// Callback used to implement the .inst directive.
  41   virtual void emitInst(uint32_t Inst);
  42
  43   /// Callback used to implement the .variant_pcs directive.
  44   virtual void emitDirectiveVariantPCS(MCSymbol *Symbol) {};
  45
  46   virtual void emitARM64WinCFIAllocStack(unsigned Size) {}
  47   virtual void emitARM64WinCFISaveR19R20X(int Offset) {}
  48   virtual void emitARM64WinCFISaveFPLR(int Offset) {}
  49   virtual void emitARM64WinCFISaveFPLRX(int Offset) {}
  50   virtual void emitARM64WinCFISaveReg(unsigned Reg, int Offset) {}
  51   virtual void emitARM64WinCFISaveRegX(unsigned Reg, int Offset) {}
  52   virtual void emitARM64WinCFISaveRegP(unsigned Reg, int Offset) {}
  53   virtual void emitARM64WinCFISaveRegPX(unsigned Reg, int Offset) {}
  54   virtual void emitARM64WinCFISaveLRPair(unsigned Reg, int Offset) {}
  55   virtual void emitARM64WinCFISaveFReg(unsigned Reg, int Offset) {}
  56   virtual void emitARM64WinCFISaveFRegX(unsigned Reg, int Offset) {}
  57   virtual void emitARM64WinCFISaveFRegP(unsigned Reg, int Offset) {}
  58   virtual void emitARM64WinCFISaveFRegPX(unsigned Reg, int Offset) {}
  59   virtual void emitARM64WinCFISetFP() {}
  60   virtual void emitARM64WinCFIAddFP(unsigned Size) {}
  61   virtual void emitARM64WinCFINop() {}
  62   virtual void emitARM64WinCFISaveNext() {}
  63   virtual void emitARM64WinCFIPrologEnd() {}
  64   virtual void emitARM64WinCFIEpilogStart() {}
  65   virtual void emitARM64WinCFIEpilogEnd() {}
  66   virtual void emitARM64WinCFITrapFrame() {}
  67   virtual void emitARM64WinCFIMachineFrame() {}
  68   virtual void emitARM64WinCFIContext() {}
  69   virtual void emitARM64WinCFIClearUnwoundToCall() {}
  70
  71 private:
  72   std::unique_ptr<AssemblerConstantPools> ConstantPools;
  73 };
  74
  75 class AArch64TargetELFStreamer : public AArch64TargetStreamer {
  76 private:
  77   AArch64ELFStreamer &getStreamer();
  78
  79   void emitInst(uint32_t Inst) override;
  80   void emitDirectiveVariantPCS(MCSymbol *Symbol) override;
  81
  82 public:
  83   AArch64TargetELFStreamer(MCStreamer &S) : AArch64TargetStreamer(S) {}
  84 };
  85
  86 class AArch64TargetWinCOFFStreamer : public llvm::AArch64TargetStreamer {
  87 private:
  88   // True if we are processing SEH directives in an epilogue.
  89   bool InEpilogCFI = false;
  90
  91   // Symbol of the current epilog for which we are processing SEH directives.
  92   MCSymbol *CurrentEpilog = nullptr;
  93 public:
  94   AArch64TargetWinCOFFStreamer(llvm::MCStreamer &S)
  95     : AArch64TargetStreamer(S) {}
  96
  97   // The unwind codes on ARM64 Windows are documented at
  98   // https://docs.microsoft.com/en-us/cpp/build/arm64-exception-handling
  99   void emitARM64WinCFIAllocStack(unsigned Size) override;
 100   void emitARM64WinCFISaveR19R20X(int Offset) override;
 101   void emitARM64WinCFISaveFPLR(int Offset) override;
 102   void emitARM64WinCFISaveFPLRX(int Offset) override;
 103   void emitARM64WinCFISaveReg(unsigned Reg, int Offset) override;
 104   void emitARM64WinCFISaveRegX(unsigned Reg, int Offset) override;
 105   void emitARM64WinCFISaveRegP(unsigned Reg, int Offset) override;
 106   void emitARM64WinCFISaveRegPX(unsigned Reg, int Offset) override;
 107   void emitARM64WinCFISaveLRPair(unsigned Reg, int Offset) override;
 108   void emitARM64WinCFISaveFReg(unsigned Reg, int Offset) override;
 109   void emitARM64WinCFISaveFRegX(unsigned Reg, int Offset) override;
 110   void emitARM64WinCFISaveFRegP(unsigned Reg, int Offset) override;
 111   void emitARM64WinCFISaveFRegPX(unsigned Reg, int Offset) override;
 112   void emitARM64WinCFISetFP() override;
 113   void emitARM64WinCFIAddFP(unsigned Size) override;
 114   void emitARM64WinCFINop() override;
 115   void emitARM64WinCFISaveNext() override;
 116   void emitARM64WinCFIPrologEnd() override;
 117   void emitARM64WinCFIEpilogStart() override;
 118   void emitARM64WinCFIEpilogEnd() override;
 119   void emitARM64WinCFITrapFrame() override;
 120   void emitARM64WinCFIMachineFrame() override;
 121   void emitARM64WinCFIContext() override;
 122   void emitARM64WinCFIClearUnwoundToCall() override;
 123
 124 private:
 125   void emitARM64WinUnwindCode(unsigned UnwindCode, int Reg, int Offset);
 126 };
 127
 128 MCTargetStreamer *
 129 createAArch64ObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI);
 130
 131 } // end namespace llvm
 132
 133 #endif