• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 //===-- X86WinCOFFStreamer.cpp - X86 Target WinCOFF Streamer ----*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "X86MCTargetDesc.h"
11 #include "llvm/MC/MCWin64EH.h"
12 #include "llvm/MC/MCWinCOFFStreamer.h"
13 
14 using namespace llvm;
15 
16 namespace {
17 class X86WinCOFFStreamer : public MCWinCOFFStreamer {
18   Win64EH::UnwindEmitter EHStreamer;
19 public:
X86WinCOFFStreamer(MCContext & C,MCAsmBackend & AB,MCCodeEmitter * CE,raw_pwrite_stream & OS)20   X86WinCOFFStreamer(MCContext &C, MCAsmBackend &AB, MCCodeEmitter *CE,
21                      raw_pwrite_stream &OS)
22       : MCWinCOFFStreamer(C, AB, *CE, OS) {}
23 
24   void EmitWinEHHandlerData() override;
25   void EmitWindowsUnwindTables() override;
26   void FinishImpl() override;
27 };
28 
EmitWinEHHandlerData()29 void X86WinCOFFStreamer::EmitWinEHHandlerData() {
30   MCStreamer::EmitWinEHHandlerData();
31 
32   // We have to emit the unwind info now, because this directive
33   // actually switches to the .xdata section!
34   EHStreamer.EmitUnwindInfo(*this, getCurrentWinFrameInfo());
35 }
36 
EmitWindowsUnwindTables()37 void X86WinCOFFStreamer::EmitWindowsUnwindTables() {
38   if (!getNumWinFrameInfos())
39     return;
40   EHStreamer.Emit(*this);
41 }
42 
FinishImpl()43 void X86WinCOFFStreamer::FinishImpl() {
44   EmitFrames(nullptr);
45   EmitWindowsUnwindTables();
46 
47   MCWinCOFFStreamer::FinishImpl();
48 }
49 }
50 
createX86WinCOFFStreamer(MCContext & C,MCAsmBackend & AB,raw_pwrite_stream & OS,MCCodeEmitter * CE,bool RelaxAll,bool IncrementalLinkerCompatible)51 MCStreamer *llvm::createX86WinCOFFStreamer(MCContext &C, MCAsmBackend &AB,
52                                            raw_pwrite_stream &OS,
53                                            MCCodeEmitter *CE, bool RelaxAll,
54                                            bool IncrementalLinkerCompatible) {
55   X86WinCOFFStreamer *S = new X86WinCOFFStreamer(C, AB, CE, OS);
56   S->getAssembler().setRelaxAll(RelaxAll);
57   S->getAssembler().setIncrementalLinkerCompatible(IncrementalLinkerCompatible);
58   return S;
59 }
60 
61