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 "X86TargetMachine.h"
12 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
13 #include "llvm/MC/MCContext.h"
14 #include "llvm/MC/MCExpr.h"
15 #include "llvm/MC/MCSectionMachO.h"
16 #include "llvm/Target/Mangler.h"
17 #include "llvm/ADT/SmallString.h"
18 #include "llvm/Support/Dwarf.h"
19 using namespace llvm;
20 using namespace dwarf;
21 
22 const MCExpr *X8664_MachoTargetObjectFile::
23 getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
24                                MachineModuleInfo *MMI, unsigned Encoding,
25                                MCStreamer &Streamer) const {
26 
27   // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which
28   // is an indirect pc-relative reference.
29   if (Encoding & (DW_EH_PE_indirect | DW_EH_PE_pcrel)) {
30     const MCSymbol *Sym = Mang->getSymbol(GV);
31     const MCExpr *Res =
32       MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext());
33     const MCExpr *Four = MCConstantExpr::Create(4, getContext());
34     return MCBinaryExpr::CreateAdd(Res, Four, getContext());
35   }
36 
37   return TargetLoweringObjectFileMachO::
38     getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer);
39 }
40 
41 unsigned X8632_ELFTargetObjectFile::getPersonalityEncoding() const {
42   if (TM.getRelocationModel() == Reloc::PIC_)
43     return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
44   else
45     return DW_EH_PE_absptr;
46 }
47 
48 unsigned X8632_ELFTargetObjectFile::getLSDAEncoding() const {
49   if (TM.getRelocationModel() == Reloc::PIC_)
50     return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
51   else
52     return DW_EH_PE_absptr;
53 }
54 
55 unsigned X8632_ELFTargetObjectFile::getFDEEncoding() const {
56   if (TM.getRelocationModel() == Reloc::PIC_)
57     return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
58   else
59     return DW_EH_PE_absptr;
60 }
61 
62 unsigned X8632_ELFTargetObjectFile::getTTypeEncoding() const {
63   if (TM.getRelocationModel() == Reloc::PIC_)
64     return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
65   else
66     return DW_EH_PE_absptr;
67 }
68 
69 unsigned X8664_ELFTargetObjectFile::getPersonalityEncoding() const {
70   CodeModel::Model Model = TM.getCodeModel();
71   if (TM.getRelocationModel() == Reloc::PIC_)
72     return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
73                                                  Model == CodeModel::Medium ?
74                                             DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
75 
76   if (Model == CodeModel::Small || Model == CodeModel::Medium)
77     return DW_EH_PE_udata4;
78 
79   return DW_EH_PE_absptr;
80 }
81 
82 unsigned X8664_ELFTargetObjectFile::getLSDAEncoding() const {
83   CodeModel::Model Model = TM.getCodeModel();
84   if (TM.getRelocationModel() == Reloc::PIC_)
85     return DW_EH_PE_pcrel | (Model == CodeModel::Small ?
86                              DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
87 
88   if (Model == CodeModel::Small)
89     return DW_EH_PE_udata4;
90 
91   return DW_EH_PE_absptr;
92 }
93 
94 unsigned X8664_ELFTargetObjectFile::getFDEEncoding() const {
95   CodeModel::Model Model = TM.getCodeModel();
96   if (TM.getRelocationModel() == Reloc::PIC_)
97     return DW_EH_PE_pcrel | (Model == CodeModel::Small ||
98                              Model == CodeModel::Medium ?
99                              DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
100 
101   if (Model == CodeModel::Small || Model == CodeModel::Medium)
102     return DW_EH_PE_udata4;
103 
104   return DW_EH_PE_absptr;
105 }
106 
107 unsigned X8664_ELFTargetObjectFile::getTTypeEncoding() const {
108   CodeModel::Model Model = TM.getCodeModel();
109   if (TM.getRelocationModel() == Reloc::PIC_)
110     return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
111                                                  Model == CodeModel::Medium ?
112                                             DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
113 
114   if (Model == CodeModel::Small)
115     return DW_EH_PE_udata4;
116 
117   return DW_EH_PE_absptr;
118 }
119