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