X86TargetObjectFile.cpp revision d269a6e460a71a6c5c361a26c56c91fdb9486f45 
1//===-- llvm/Target/X86/X86TargetObjectFile.cpp - X86 Object Info ---------===//
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 "X86TargetObjectFile.h"
11#include "llvm/CodeGen/MachineModuleInfoImpls.h"
12#include "llvm/MC/MCContext.h"
13#include "llvm/MC/MCExpr.h"
14#include "llvm/Target/Mangler.h"
15#include "llvm/ADT/SmallString.h"
16using namespace llvm;
17
18const MCExpr *X8632_MachoTargetObjectFile::
19getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
20                                 MachineModuleInfo *MMI,
21                                 bool &IsIndirect, bool &IsPCRel) const {
22  // The mach-o version of this method defaults to returning a stub reference.
23  IsIndirect = true;
24  IsPCRel    = false;
25
26
27  MachineModuleInfoMachO &MachOMMI =
28  MMI->getObjFileInfo<MachineModuleInfoMachO>();
29
30  // FIXME: Use GetSymbolWithGlobalValueBase.
31  SmallString<128> Name;
32  Mang->getNameWithPrefix(Name, GV, true);
33  Name += "$non_lazy_ptr";
34
35  // Add information about the stub reference to MachOMMI so that the stub gets
36  // emitted by the asmprinter.
37  MCSymbol *Sym = getContext().GetOrCreateSymbol(Name.str());
38  MCSymbol *&StubSym = MachOMMI.getGVStubEntry(Sym);
39  if (StubSym == 0) {
40    Name.clear();
41    Mang->getNameWithPrefix(Name, GV, false);
42    StubSym = getContext().GetOrCreateSymbol(Name.str());
43  }
44
45  return MCSymbolRefExpr::Create(Sym, getContext());
46}
47
48const MCExpr *X8664_MachoTargetObjectFile::
49getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
50                                 MachineModuleInfo *MMI,
51                                 bool &IsIndirect, bool &IsPCRel) const {
52
53  // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which
54  // is an indirect pc-relative reference.
55  IsIndirect = true;
56  IsPCRel    = true;
57
58  SmallString<128> Name;
59  Mang->getNameWithPrefix(Name, GV, false);
60  Name += "@GOTPCREL";
61  const MCExpr *Res =
62    MCSymbolRefExpr::Create(Name.str(), getContext());
63  const MCExpr *Four = MCConstantExpr::Create(4, getContext());
64  return MCBinaryExpr::CreateAdd(Res, Four, getContext());
65}
66
67