1 //===-------- MipsELFStreamer.cpp - ELF Object Output ---------------------===// 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 #include "MipsELFStreamer.h" 10 #include "MipsOptionRecord.h" 11 #include "MipsTargetStreamer.h" 12 #include "llvm/BinaryFormat/ELF.h" 13 #include "llvm/MC/MCAsmBackend.h" 14 #include "llvm/MC/MCAssembler.h" 15 #include "llvm/MC/MCCodeEmitter.h" 16 #include "llvm/MC/MCContext.h" 17 #include "llvm/MC/MCDwarf.h" 18 #include "llvm/MC/MCInst.h" 19 #include "llvm/MC/MCObjectWriter.h" 20 #include "llvm/MC/MCSymbolELF.h" 21 #include "llvm/Support/Casting.h" 22 23 using namespace llvm; 24 25 MipsELFStreamer::MipsELFStreamer(MCContext &Context, 26 std::unique_ptr<MCAsmBackend> MAB, 27 std::unique_ptr<MCObjectWriter> OW, 28 std::unique_ptr<MCCodeEmitter> Emitter) 29 : MCELFStreamer(Context, std::move(MAB), std::move(OW), 30 std::move(Emitter)) { 31 RegInfoRecord = new MipsRegInfoRecord(this, Context); 32 MipsOptionRecords.push_back( 33 std::unique_ptr<MipsRegInfoRecord>(RegInfoRecord)); 34 } 35 36 void MipsELFStreamer::emitInstruction(const MCInst &Inst, 37 const MCSubtargetInfo &STI) { 38 MCELFStreamer::emitInstruction(Inst, STI); 39 40 MCContext &Context = getContext(); 41 const MCRegisterInfo *MCRegInfo = Context.getRegisterInfo(); 42 43 for (unsigned OpIndex = 0; OpIndex < Inst.getNumOperands(); ++OpIndex) { 44 const MCOperand &Op = Inst.getOperand(OpIndex); 45 46 if (!Op.isReg()) 47 continue; 48 49 unsigned Reg = Op.getReg(); 50 RegInfoRecord->SetPhysRegUsed(Reg, MCRegInfo); 51 } 52 53 createPendingLabelRelocs(); 54 } 55 56 void MipsELFStreamer::emitCFIStartProcImpl(MCDwarfFrameInfo &Frame) { 57 Frame.Begin = getContext().createTempSymbol(); 58 MCELFStreamer::emitLabel(Frame.Begin); 59 } 60 61 MCSymbol *MipsELFStreamer::emitCFILabel() { 62 MCSymbol *Label = getContext().createTempSymbol("cfi", true); 63 MCELFStreamer::emitLabel(Label); 64 return Label; 65 } 66 67 void MipsELFStreamer::emitCFIEndProcImpl(MCDwarfFrameInfo &Frame) { 68 Frame.End = getContext().createTempSymbol(); 69 MCELFStreamer::emitLabel(Frame.End); 70 } 71 72 void MipsELFStreamer::createPendingLabelRelocs() { 73 MipsTargetELFStreamer *ELFTargetStreamer = 74 static_cast<MipsTargetELFStreamer *>(getTargetStreamer()); 75 76 // FIXME: Also mark labels when in MIPS16 mode. 77 if (ELFTargetStreamer->isMicroMipsEnabled()) { 78 for (auto *L : Labels) { 79 auto *Label = cast<MCSymbolELF>(L); 80 getAssembler().registerSymbol(*Label); 81 Label->setOther(ELF::STO_MIPS_MICROMIPS); 82 } 83 } 84 85 Labels.clear(); 86 } 87 88 void MipsELFStreamer::emitLabel(MCSymbol *Symbol, SMLoc Loc) { 89 MCELFStreamer::emitLabel(Symbol); 90 Labels.push_back(Symbol); 91 } 92 93 void MipsELFStreamer::SwitchSection(MCSection *Section, 94 const MCExpr *Subsection) { 95 MCELFStreamer::SwitchSection(Section, Subsection); 96 Labels.clear(); 97 } 98 99 void MipsELFStreamer::emitValueImpl(const MCExpr *Value, unsigned Size, 100 SMLoc Loc) { 101 MCELFStreamer::emitValueImpl(Value, Size, Loc); 102 Labels.clear(); 103 } 104 105 void MipsELFStreamer::emitIntValue(uint64_t Value, unsigned Size) { 106 MCELFStreamer::emitIntValue(Value, Size); 107 Labels.clear(); 108 } 109 110 void MipsELFStreamer::EmitMipsOptionRecords() { 111 for (const auto &I : MipsOptionRecords) 112 I->EmitMipsOptionRecord(); 113 } 114 115 MCELFStreamer *llvm::createMipsELFStreamer( 116 MCContext &Context, std::unique_ptr<MCAsmBackend> MAB, 117 std::unique_ptr<MCObjectWriter> OW, std::unique_ptr<MCCodeEmitter> Emitter, 118 bool RelaxAll) { 119 return new MipsELFStreamer(Context, std::move(MAB), std::move(OW), 120 std::move(Emitter)); 121 } 122