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::
getExprForDwarfGlobalReference(const GlobalValue * GV,Mangler * Mang,MachineModuleInfo * MMI,unsigned Encoding,MCStreamer & Streamer) const23 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 MCSymbol *X8664_MachoTargetObjectFile::
getCFIPersonalitySymbol(const GlobalValue * GV,Mangler * Mang,MachineModuleInfo * MMI) const42 getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
43 MachineModuleInfo *MMI) const {
44 return Mang->getSymbol(GV);
45 }
46
getPersonalityEncoding() const47 unsigned X8632_ELFTargetObjectFile::getPersonalityEncoding() const {
48 if (TM.getRelocationModel() == Reloc::PIC_)
49 return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
50 else
51 return DW_EH_PE_absptr;
52 }
53
getLSDAEncoding() const54 unsigned X8632_ELFTargetObjectFile::getLSDAEncoding() const {
55 if (TM.getRelocationModel() == Reloc::PIC_)
56 return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
57 else
58 return DW_EH_PE_absptr;
59 }
60
getFDEEncoding(bool FDE) const61 unsigned X8632_ELFTargetObjectFile::getFDEEncoding(bool FDE) const {
62 if (TM.getRelocationModel() == Reloc::PIC_)
63 return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
64 else
65 return DW_EH_PE_absptr;
66 }
67
getTTypeEncoding() const68 unsigned X8632_ELFTargetObjectFile::getTTypeEncoding() const {
69 if (TM.getRelocationModel() == Reloc::PIC_)
70 return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
71 else
72 return DW_EH_PE_absptr;
73 }
74
getPersonalityEncoding() const75 unsigned X8664_ELFTargetObjectFile::getPersonalityEncoding() const {
76 CodeModel::Model Model = TM.getCodeModel();
77 if (TM.getRelocationModel() == Reloc::PIC_)
78 return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
79 Model == CodeModel::Medium ?
80 DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
81
82 if (Model == CodeModel::Small || Model == CodeModel::Medium)
83 return DW_EH_PE_udata4;
84
85 return DW_EH_PE_absptr;
86 }
87
getLSDAEncoding() const88 unsigned X8664_ELFTargetObjectFile::getLSDAEncoding() const {
89 CodeModel::Model Model = TM.getCodeModel();
90 if (TM.getRelocationModel() == Reloc::PIC_)
91 return DW_EH_PE_pcrel | (Model == CodeModel::Small ?
92 DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
93
94 if (Model == CodeModel::Small)
95 return DW_EH_PE_udata4;
96
97 return DW_EH_PE_absptr;
98 }
99
getFDEEncoding(bool CFI) const100 unsigned X8664_ELFTargetObjectFile::getFDEEncoding(bool CFI) const {
101 if (CFI)
102 return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
103
104 if (TM.getRelocationModel() == Reloc::PIC_)
105 return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
106
107 return DW_EH_PE_udata4;
108 }
109
getTTypeEncoding() const110 unsigned X8664_ELFTargetObjectFile::getTTypeEncoding() const {
111 CodeModel::Model Model = TM.getCodeModel();
112 if (TM.getRelocationModel() == Reloc::PIC_)
113 return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
114 Model == CodeModel::Medium ?
115 DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
116
117 if (Model == CodeModel::Small)
118 return DW_EH_PE_udata4;
119
120 return DW_EH_PE_absptr;
121 }
122