1 //===- PPCELFStreamer.h - ELF Object Output --------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This is a custom MCELFStreamer for PowerPC. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_LIB_TARGET_PPC_MCELFSTREAMER_PPCELFSTREAMER_H 15 #define LLVM_LIB_TARGET_PPC_MCELFSTREAMER_PPCELFSTREAMER_H 16 17 #include "llvm/ADT/SmallVector.h" 18 #include "llvm/MC/MCELFStreamer.h" 19 #include <memory> 20 21 namespace llvm { 22 23 class MCAsmBackend; 24 class MCCodeEmitter; 25 class MCContext; 26 class MCSubtargetInfo; 27 28 class PPCELFStreamer : public MCELFStreamer { 29 // We need to keep track of the last label we emitted (only one) because 30 // depending on whether the label is on the same line as an aligned 31 // instruction or not, the label may refer to the instruction or the nop. 32 MCSymbol *LastLabel; 33 SMLoc LastLabelLoc; 34 35 public: 36 PPCELFStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> MAB, 37 std::unique_ptr<MCObjectWriter> OW, 38 std::unique_ptr<MCCodeEmitter> Emitter); 39 40 void emitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override; 41 42 // EmitLabel updates LastLabel and LastLabelLoc when a new label is emitted. 43 void emitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override; 44 private: 45 void emitPrefixedInstruction(const MCInst &Inst, const MCSubtargetInfo &STI); 46 void emitGOTToPCRelReloc(const MCInst &Inst); 47 void emitGOTToPCRelLabel(const MCInst &Inst); 48 }; 49 50 // Check if the instruction Inst is part of a pair of instructions that make up 51 // a link time GOT PC Rel optimization. 52 Optional<bool> isPartOfGOTToPCRelPair(const MCInst &Inst, 53 const MCSubtargetInfo &STI); 54 55 MCELFStreamer *createPPCELFStreamer(MCContext &Context, 56 std::unique_ptr<MCAsmBackend> MAB, 57 std::unique_ptr<MCObjectWriter> OW, 58 std::unique_ptr<MCCodeEmitter> Emitter); 59 } // end namespace llvm 60 61 #endif // LLVM_LIB_TARGET_PPC_MCELFSTREAMER_PPCELFSTREAMER_H 62