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
18using namespace llvm;
19
20namespace {
21class X86WinCOFFStreamer : public MCWinCOFFStreamer {
22 Win64EH::UnwindEmitter EHStreamer;
23public:
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
37void X86WinCOFFStreamer::emitInstruction(const MCInst &Inst,
38 const MCSubtargetInfo &STI) {
39 X86_MC::emitInstruction(*this, Inst, STI);
40}
41
42void 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 // Handlers are always associated with the parent frame.
49 CurFrame = CurFrame->ChainedParent ? CurFrame->ChainedParent : CurFrame;
50 EHStreamer.EmitUnwindInfo(Streamer&: *this, FI: CurFrame, /* HandlerData = */ true);
51 }
52}
53
54void X86WinCOFFStreamer::emitWindowsUnwindTables(WinEH::FrameInfo *Frame) {
55 EHStreamer.EmitUnwindInfo(Streamer&: *this, FI: Frame, /* HandlerData = */ false);
56}
57
58void X86WinCOFFStreamer::emitWindowsUnwindTables() {
59 if (!getNumWinFrameInfos())
60 return;
61 EHStreamer.Emit(Streamer&: *this);
62}
63
64void X86WinCOFFStreamer::emitCVFPOData(const MCSymbol *ProcSym, SMLoc Loc) {
65 X86TargetStreamer *XTS =
66 static_cast<X86TargetStreamer *>(getTargetStreamer());
67 XTS->emitFPOData(ProcSym, L: Loc);
68}
69
70void X86WinCOFFStreamer::finishImpl() {
71 emitFrames();
72 emitWindowsUnwindTables();
73
74 MCWinCOFFStreamer::finishImpl();
75}
76} // namespace
77
78MCStreamer *
79llvm::createX86WinCOFFStreamer(MCContext &C, std::unique_ptr<MCAsmBackend> &&AB,
80 std::unique_ptr<MCObjectWriter> &&OW,
81 std::unique_ptr<MCCodeEmitter> &&CE) {
82 return new X86WinCOFFStreamer(C, std::move(AB), std::move(CE), std::move(OW));
83}
84