1 //===-- X86WinCOFFStreamer.cpp - X86 Target WinCOFF Streamer ----*- 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 #include "X86MCTargetDesc.h" 10 #include "X86TargetStreamer.h" 11 #include "llvm/MC/MCAsmBackend.h" 12 #include "llvm/MC/MCAssembler.h" 13 #include "llvm/MC/MCCodeEmitter.h" 14 #include "llvm/MC/MCObjectWriter.h" 15 #include "llvm/MC/MCWin64EH.h" 16 #include "llvm/MC/MCWinCOFFStreamer.h" 17 18 using namespace llvm; 19 20 namespace { 21 class X86WinCOFFStreamer : public MCWinCOFFStreamer { 22 Win64EH::UnwindEmitter EHStreamer; 23 public: 24 X86WinCOFFStreamer(MCContext &C, std::unique_ptr<MCAsmBackend> AB, 25 std::unique_ptr<MCCodeEmitter> CE, 26 std::unique_ptr<MCObjectWriter> OW) 27 : MCWinCOFFStreamer(C, std::move(AB), std::move(CE), std::move(OW)) {} 28 29 void emitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override; 30 void emitWinEHHandlerData(SMLoc Loc) override; 31 void emitWindowsUnwindTables(WinEH::FrameInfo *Frame) override; 32 void emitWindowsUnwindTables() override; 33 void emitCVFPOData(const MCSymbol *ProcSym, SMLoc Loc) override; 34 void finishImpl() override; 35 }; 36 37 void X86WinCOFFStreamer::emitInstruction(const MCInst &Inst, 38 const MCSubtargetInfo &STI) { 39 X86_MC::emitInstruction(*this, Inst, STI); 40 } 41 42 void X86WinCOFFStreamer::emitWinEHHandlerData(SMLoc Loc) { 43 MCStreamer::emitWinEHHandlerData(Loc); 44 45 // We have to emit the unwind info now, because this directive 46 // actually switches to the .xdata section. 47 if (WinEH::FrameInfo *CurFrame = getCurrentWinFrameInfo()) 48 EHStreamer.EmitUnwindInfo(*this, CurFrame, /* HandlerData = */ true); 49 } 50 51 void X86WinCOFFStreamer::emitWindowsUnwindTables(WinEH::FrameInfo *Frame) { 52 EHStreamer.EmitUnwindInfo(*this, Frame, /* HandlerData = */ false); 53 } 54 55 void X86WinCOFFStreamer::emitWindowsUnwindTables() { 56 if (!getNumWinFrameInfos()) 57 return; 58 EHStreamer.Emit(*this); 59 } 60 61 void X86WinCOFFStreamer::emitCVFPOData(const MCSymbol *ProcSym, SMLoc Loc) { 62 X86TargetStreamer *XTS = 63 static_cast<X86TargetStreamer *>(getTargetStreamer()); 64 XTS->emitFPOData(ProcSym, Loc); 65 } 66 67 void X86WinCOFFStreamer::finishImpl() { 68 emitFrames(nullptr); 69 emitWindowsUnwindTables(); 70 71 MCWinCOFFStreamer::finishImpl(); 72 } 73 } // namespace 74 75 MCStreamer * 76 llvm::createX86WinCOFFStreamer(MCContext &C, std::unique_ptr<MCAsmBackend> &&AB, 77 std::unique_ptr<MCObjectWriter> &&OW, 78 std::unique_ptr<MCCodeEmitter> &&CE) { 79 return new X86WinCOFFStreamer(C, std::move(AB), std::move(CE), std::move(OW)); 80 } 81