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/ADT/SmallString.h"
12 #include "llvm/Support/Mangler.h"
13 #include "llvm/MC/MCContext.h"
14 #include "llvm/MC/MCExpr.h"
15 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
16 using namespace llvm;
17 
18 const MCExpr *X8632_MachoTargetObjectFile::
19 getSymbolForDwarfGlobalReference(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   SmallString<128> Name;
31   Mang->getNameWithPrefix(Name, GV, true);
32   Name += "$non_lazy_ptr";
33 
34   // Add information about the stub reference to MachOMMI so that the stub gets
35   // emitted by the asmprinter.
36   MCSymbol *Sym = getContext().GetOrCreateSymbol(Name.str());
37   const MCSymbol *&StubSym = MachOMMI.getGVStubEntry(Sym);
38   if (StubSym == 0) {
39     Name.clear();
40     Mang->getNameWithPrefix(Name, GV, false);
41     StubSym = getContext().GetOrCreateSymbol(Name.str());
42   }
43 
44   return MCSymbolRefExpr::Create(Sym, getContext());
45 }
46 
47 const MCExpr *X8664_MachoTargetObjectFile::
48 getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
49                                  MachineModuleInfo *MMI,
50                                  bool &IsIndirect, bool &IsPCRel) const {
51 
52   // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which
53   // is an indirect pc-relative reference.
54   IsIndirect = true;
55   IsPCRel    = true;
56 
57   SmallString<128> Name;
58   Mang->getNameWithPrefix(Name, GV, false);
59   Name += "@GOTPCREL";
60   const MCExpr *Res =
61     MCSymbolRefExpr::Create(Name.str(), getContext());
62   const MCExpr *Four = MCConstantExpr::Create(4, getContext());
63   return MCBinaryExpr::CreateAdd(Res, Four, getContext());
64 }
65 
66