X86WinCOFFStreamer.cpp revision 360784 
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
17using namespace llvm;
18
19namespace {
20class X86WinCOFFStreamer : public MCWinCOFFStreamer {
21  Win64EH::UnwindEmitter EHStreamer;
22public:
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
34void 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  if (WinEH::FrameInfo *CurFrame = getCurrentWinFrameInfo())
40    EHStreamer.EmitUnwindInfo(*this, CurFrame);
41}
42
43void X86WinCOFFStreamer::EmitWindowsUnwindTables() {
44  if (!getNumWinFrameInfos())
45    return;
46  EHStreamer.Emit(*this);
47}
48
49void X86WinCOFFStreamer::EmitCVFPOData(const MCSymbol *ProcSym, SMLoc Loc) {
50  X86TargetStreamer *XTS =
51      static_cast<X86TargetStreamer *>(getTargetStreamer());
52  XTS->emitFPOData(ProcSym, Loc);
53}
54
55void X86WinCOFFStreamer::FinishImpl() {
56  EmitFrames(nullptr);
57  EmitWindowsUnwindTables();
58
59  MCWinCOFFStreamer::FinishImpl();
60}
61}
62
63MCStreamer *llvm::createX86WinCOFFStreamer(MCContext &C,
64                                           std::unique_ptr<MCAsmBackend> &&AB,
65                                           std::unique_ptr<MCObjectWriter> &&OW,
66                                           std::unique_ptr<MCCodeEmitter> &&CE,
67                                           bool RelaxAll,
68                                           bool IncrementalLinkerCompatible) {
69  X86WinCOFFStreamer *S =
70      new X86WinCOFFStreamer(C, std::move(AB), std::move(CE), std::move(OW));
71  S->getAssembler().setRelaxAll(RelaxAll);
72  S->getAssembler().setIncrementalLinkerCompatible(IncrementalLinkerCompatible);
73  return S;
74}
75
76