llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFStreamer.h

   1 //===- PPCELFStreamer.h - ELF Object Output --------------------*- 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 is a custom MCELFStreamer for PowerPC.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_LIB_TARGET_PPC_MCELFSTREAMER_PPCELFSTREAMER_H
  14 #define LLVM_LIB_TARGET_PPC_MCELFSTREAMER_PPCELFSTREAMER_H
  15
  16 #include "llvm/MC/MCELFStreamer.h"
  17 #include <memory>
  18
  19 namespace llvm {
  20
  21 class MCAsmBackend;
  22 class MCCodeEmitter;
  23 class MCContext;
  24 class MCSubtargetInfo;
  25
  26 class PPCELFStreamer : public MCELFStreamer {
  27   // We need to keep track of the last label we emitted (only one) because
  28   // depending on whether the label is on the same line as an aligned
  29   // instruction or not, the label may refer to the instruction or the nop.
  30   MCSymbol *LastLabel;
  31   SMLoc LastLabelLoc;
  32
  33 public:
  34   PPCELFStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> MAB,
  35                  std::unique_ptr<MCObjectWriter> OW,
  36                  std::unique_ptr<MCCodeEmitter> Emitter);
  37
  38   void emitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
  39
  40   // EmitLabel updates LastLabel and LastLabelLoc when a new label is emitted.
  41   void emitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
  42 private:
  43   void emitPrefixedInstruction(const MCInst &Inst, const MCSubtargetInfo &STI);
  44   void emitGOTToPCRelReloc(const MCInst &Inst);
  45   void emitGOTToPCRelLabel(const MCInst &Inst);
  46 };
  47
  48 // Check if the instruction Inst is part of a pair of instructions that make up
  49 // a link time GOT PC Rel optimization.
  50 std::optional<bool> isPartOfGOTToPCRelPair(const MCInst &Inst,
  51                                            const MCSubtargetInfo &STI);
  52
  53 MCELFStreamer *createPPCELFStreamer(MCContext &Context,
  54                                     std::unique_ptr<MCAsmBackend> MAB,
  55                                     std::unique_ptr<MCObjectWriter> OW,
  56                                     std::unique_ptr<MCCodeEmitter> Emitter);
  57 } // end namespace llvm
  58
  59 #endif // LLVM_LIB_TARGET_PPC_MCELFSTREAMER_PPCELFSTREAMER_H