xref: /freebsd/contrib/llvm-project/llvm/lib/Target/X86/MCTargetDesc/X86WinCOFFStreamer.cpp (revision 0d8fe2373503aeac48492f28073049a8bfa4feb5)
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