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() override; 30 void EmitCVFPOData(const MCSymbol *ProcSym, SMLoc Loc) override; 31 void FinishImpl() override; 32 }; 33 34 void X86WinCOFFStreamer::EmitWinEHHandlerData(SMLoc Loc) { 35 MCStreamer::EmitWinEHHandlerData(Loc); 36 37 // We have to emit the unwind info now, because this directive 38 // actually switches to the .xdata section! 39 EHStreamer.EmitUnwindInfo(*this, getCurrentWinFrameInfo()); 40 } 41 42 void X86WinCOFFStreamer::EmitWindowsUnwindTables() { 43 if (!getNumWinFrameInfos()) 44 return; 45 EHStreamer.Emit(*this); 46 } 47 48 void X86WinCOFFStreamer::EmitCVFPOData(const MCSymbol *ProcSym, SMLoc Loc) { 49 X86TargetStreamer *XTS = 50 static_cast<X86TargetStreamer *>(getTargetStreamer()); 51 XTS->emitFPOData(ProcSym, Loc); 52 } 53 54 void X86WinCOFFStreamer::FinishImpl() { 55 EmitFrames(nullptr); 56 EmitWindowsUnwindTables(); 57 58 MCWinCOFFStreamer::FinishImpl(); 59 } 60 } 61 62 MCStreamer *llvm::createX86WinCOFFStreamer(MCContext &C, 63 std::unique_ptr<MCAsmBackend> &&AB, 64 std::unique_ptr<MCObjectWriter> &&OW, 65 std::unique_ptr<MCCodeEmitter> &&CE, 66 bool RelaxAll, 67 bool IncrementalLinkerCompatible) { 68 X86WinCOFFStreamer *S = 69 new X86WinCOFFStreamer(C, std::move(AB), std::move(CE), std::move(OW)); 70 S->getAssembler().setRelaxAll(RelaxAll); 71 S->getAssembler().setIncrementalLinkerCompatible(IncrementalLinkerCompatible); 72 return S; 73 } 74 75