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/ADT/SmallVector.h" 17 #include "llvm/MC/MCELFStreamer.h" 18 #include <memory> 19 20 namespace llvm { 21 22 class MCAsmBackend; 23 class MCCodeEmitter; 24 class MCContext; 25 class MCSubtargetInfo; 26 27 class PPCELFStreamer : public MCELFStreamer { 28 // We need to keep track of the last label we emitted (only one) because 29 // depending on whether the label is on the same line as an aligned 30 // instruction or not, the label may refer to the instruction or the nop. 31 MCSymbol *LastLabel; 32 SMLoc LastLabelLoc; 33 34 public: 35 PPCELFStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> MAB, 36 std::unique_ptr<MCObjectWriter> OW, 37 std::unique_ptr<MCCodeEmitter> Emitter); 38 39 void emitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override; 40 41 // EmitLabel updates LastLabel and LastLabelLoc when a new label is emitted. 42 void emitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override; 43 private: 44 void emitPrefixedInstruction(const MCInst &Inst, const MCSubtargetInfo &STI); 45 void emitGOTToPCRelReloc(const MCInst &Inst); 46 void emitGOTToPCRelLabel(const MCInst &Inst); 47 }; 48 49 // Check if the instruction Inst is part of a pair of instructions that make up 50 // a link time GOT PC Rel optimization. 51 std::optional<bool> isPartOfGOTToPCRelPair(const MCInst &Inst, 52 const MCSubtargetInfo &STI); 53 54 MCELFStreamer *createPPCELFStreamer(MCContext &Context, 55 std::unique_ptr<MCAsmBackend> MAB, 56 std::unique_ptr<MCObjectWriter> OW, 57 std::unique_ptr<MCCodeEmitter> Emitter); 58 } // end namespace llvm 59 60 #endif // LLVM_LIB_TARGET_PPC_MCELFSTREAMER_PPCELFSTREAMER_H 61