Home | History | Annotate | Line # | Download | only in MCTargetDesc 
      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