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 60