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