MCObjectFileInfo.h revision 09ac3d841367d5d56328eade506c951e0dc3a72d
1//===-- llvm/MC/MCObjectFileInfo.h - Object File Info -----------*- 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// This file describes common object file formats. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_MC_MCBJECTFILEINFO_H 15#define LLVM_MC_MCBJECTFILEINFO_H 16 17#include "llvm/MC/MCCodeGenInfo.h" 18#include "llvm/ADT/StringRef.h" 19#include "llvm/MC/SectionKind.h" 20 21namespace llvm { 22class MCContext; 23class MCSection; 24class Triple; 25 26class MCObjectFileInfo { 27protected: 28 /// CommDirectiveSupportsAlignment - True if .comm supports alignment. This 29 /// is a hack for as long as we support 10.4 Tiger, whose assembler doesn't 30 /// support alignment on comm. 31 bool CommDirectiveSupportsAlignment; 32 33 /// SupportsWeakEmptyEHFrame - True if target object file supports a 34 /// weak_definition of constant 0 for an omitted EH frame. 35 bool SupportsWeakOmittedEHFrame; 36 37 /// IsFunctionEHFrameSymbolPrivate - This flag is set to true if the 38 /// "EH_frame" symbol for EH information should be an assembler temporary (aka 39 /// private linkage, aka an L or .L label) or false if it should be a normal 40 /// non-.globl label. This defaults to true. 41 bool IsFunctionEHFrameSymbolPrivate; 42 43 /// PersonalityEncoding, LSDAEncoding, FDEEncoding, TTypeEncoding - Some 44 /// encoding values for EH. 45 unsigned PersonalityEncoding; 46 unsigned LSDAEncoding; 47 unsigned FDEEncoding; 48 unsigned FDECFIEncoding; 49 unsigned TTypeEncoding; 50 51 /// TextSection - Section directive for standard text. 52 /// 53 const MCSection *TextSection; 54 55 /// DataSection - Section directive for standard data. 56 /// 57 const MCSection *DataSection; 58 59 /// BSSSection - Section that is default initialized to zero. 60 const MCSection *BSSSection; 61 62 /// ReadOnlySection - Section that is readonly and can contain arbitrary 63 /// initialized data. Targets are not required to have a readonly section. 64 /// If they don't, various bits of code will fall back to using the data 65 /// section for constants. 66 const MCSection *ReadOnlySection; 67 68 /// StaticCtorSection - This section contains the static constructor pointer 69 /// list. 70 const MCSection *StaticCtorSection; 71 72 /// StaticDtorSection - This section contains the static destructor pointer 73 /// list. 74 const MCSection *StaticDtorSection; 75 76 /// LSDASection - If exception handling is supported by the target, this is 77 /// the section the Language Specific Data Area information is emitted to. 78 const MCSection *LSDASection; 79 80 /// CompactUnwindSection - If exception handling is supported by the target 81 /// and the target can support a compact representation of the CIE and FDE, 82 /// this is the section to emit them into. 83 const MCSection *CompactUnwindSection; 84 85 /// DwarfAccelNamesSection, DwarfAccelObjCSection 86 /// If we use the DWARF accelerated hash tables then we want toe emit these 87 /// sections. 88 const MCSection *DwarfAccelNamesSection; 89 const MCSection *DwarfAccelObjCSection; 90 const MCSection *DwarfAccelNamespaceSection; 91 const MCSection *DwarfAccelTypesSection; 92 93 // Dwarf sections for debug info. If a target supports debug info, these must 94 // be set. 95 const MCSection *DwarfAbbrevSection; 96 const MCSection *DwarfInfoSection; 97 const MCSection *DwarfLineSection; 98 const MCSection *DwarfFrameSection; 99 const MCSection *DwarfPubNamesSection; 100 const MCSection *DwarfPubTypesSection; 101 const MCSection *DwarfDebugInlineSection; 102 const MCSection *DwarfStrSection; 103 const MCSection *DwarfLocSection; 104 const MCSection *DwarfARangesSection; 105 const MCSection *DwarfRangesSection; 106 const MCSection *DwarfMacroInfoSection; 107 108 // Extra TLS Variable Data section. If the target needs to put additional 109 // information for a TLS variable, it'll go here. 110 const MCSection *TLSExtraDataSection; 111 112 /// TLSDataSection - Section directive for Thread Local data. 113 /// ELF and MachO only. 114 const MCSection *TLSDataSection; // Defaults to ".tdata". 115 116 /// TLSBSSSection - Section directive for Thread Local uninitialized data. 117 /// Null if this target doesn't support a BSS section. 118 /// ELF and MachO only. 119 const MCSection *TLSBSSSection; // Defaults to ".tbss". 120 121 122 /// EHFrameSection - EH frame section. It is initialized on demand so it 123 /// can be overwritten (with uniquing). 124 const MCSection *EHFrameSection; 125 126 /// ELF specific sections. 127 /// 128 const MCSection *DataRelSection; 129 const MCSection *DataRelLocalSection; 130 const MCSection *DataRelROSection; 131 const MCSection *DataRelROLocalSection; 132 const MCSection *MergeableConst4Section; 133 const MCSection *MergeableConst8Section; 134 const MCSection *MergeableConst16Section; 135 136 /// MachO specific sections. 137 /// 138 139 /// TLSTLVSection - Section for thread local structure information. 140 /// Contains the source code name of the variable, visibility and a pointer 141 /// to the initial value (.tdata or .tbss). 142 const MCSection *TLSTLVSection; // Defaults to ".tlv". 143 144 /// TLSThreadInitSection - Section for thread local data initialization 145 /// functions. 146 const MCSection *TLSThreadInitSection; // Defaults to ".thread_init_func". 147 148 const MCSection *CStringSection; 149 const MCSection *UStringSection; 150 const MCSection *TextCoalSection; 151 const MCSection *ConstTextCoalSection; 152 const MCSection *ConstDataSection; 153 const MCSection *DataCoalSection; 154 const MCSection *DataCommonSection; 155 const MCSection *DataBSSSection; 156 const MCSection *FourByteConstantSection; 157 const MCSection *EightByteConstantSection; 158 const MCSection *SixteenByteConstantSection; 159 const MCSection *LazySymbolPointerSection; 160 const MCSection *NonLazySymbolPointerSection; 161 162 /// COFF specific sections. 163 /// 164 const MCSection *DrectveSection; 165 const MCSection *PDataSection; 166 const MCSection *XDataSection; 167 168public: 169 void InitMCObjectFileInfo(StringRef TT, Reloc::Model RM, CodeModel::Model CM, 170 MCContext &ctx); 171 172 bool isFunctionEHFrameSymbolPrivate() const { 173 return IsFunctionEHFrameSymbolPrivate; 174 } 175 bool getSupportsWeakOmittedEHFrame() const { 176 return SupportsWeakOmittedEHFrame; 177 } 178 bool getCommDirectiveSupportsAlignment() const { 179 return CommDirectiveSupportsAlignment; 180 } 181 182 unsigned getPersonalityEncoding() const { return PersonalityEncoding; } 183 unsigned getLSDAEncoding() const { return LSDAEncoding; } 184 unsigned getFDEEncoding(bool CFI) const { 185 return CFI ? FDECFIEncoding : FDEEncoding; 186 } 187 unsigned getTTypeEncoding() const { return TTypeEncoding; } 188 189 const MCSection *getTextSection() const { return TextSection; } 190 const MCSection *getDataSection() const { return DataSection; } 191 const MCSection *getBSSSection() const { return BSSSection; } 192 const MCSection *getStaticCtorSection() const { return StaticCtorSection; } 193 const MCSection *getStaticDtorSection() const { return StaticDtorSection; } 194 const MCSection *getLSDASection() const { return LSDASection; } 195 const MCSection *getCompactUnwindSection() const{ 196 return CompactUnwindSection; 197 } 198 const MCSection *getDwarfAccelNamesSection() const { 199 return DwarfAccelNamesSection; 200 } 201 const MCSection *getDwarfAccelObjCSection() const { 202 return DwarfAccelObjCSection; 203 } 204 const MCSection *getDwarfAccelNamespaceSection() const { 205 return DwarfAccelNamespaceSection; 206 } 207 const MCSection *getDwarfAccelTypesSection() const { 208 return DwarfAccelTypesSection; 209 } 210 const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; } 211 const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; } 212 const MCSection *getDwarfLineSection() const { return DwarfLineSection; } 213 const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; } 214 const MCSection *getDwarfPubNamesSection() const{return DwarfPubNamesSection;} 215 const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;} 216 const MCSection *getDwarfDebugInlineSection() const { 217 return DwarfDebugInlineSection; 218 } 219 const MCSection *getDwarfStrSection() const { return DwarfStrSection; } 220 const MCSection *getDwarfLocSection() const { return DwarfLocSection; } 221 const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;} 222 const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; } 223 const MCSection *getDwarfMacroInfoSection() const { 224 return DwarfMacroInfoSection; 225 } 226 const MCSection *getTLSExtraDataSection() const { 227 return TLSExtraDataSection; 228 } 229 const MCSection *getTLSDataSection() const { return TLSDataSection; } 230 const MCSection *getTLSBSSSection() const { return TLSBSSSection; } 231 232 /// ELF specific sections. 233 /// 234 const MCSection *getDataRelSection() const { return DataRelSection; } 235 const MCSection *getDataRelLocalSection() const { 236 return DataRelLocalSection; 237 } 238 const MCSection *getDataRelROSection() const { return DataRelROSection; } 239 const MCSection *getDataRelROLocalSection() const { 240 return DataRelROLocalSection; 241 } 242 const MCSection *getMergeableConst4Section() const { 243 return MergeableConst4Section; 244 } 245 const MCSection *getMergeableConst8Section() const { 246 return MergeableConst8Section; 247 } 248 const MCSection *getMergeableConst16Section() const { 249 return MergeableConst16Section; 250 } 251 252 /// MachO specific sections. 253 /// 254 const MCSection *getTLSTLVSection() const { return TLSTLVSection; } 255 const MCSection *getTLSThreadInitSection() const { 256 return TLSThreadInitSection; 257 } 258 const MCSection *getCStringSection() const { return CStringSection; } 259 const MCSection *getUStringSection() const { return UStringSection; } 260 const MCSection *getTextCoalSection() const { return TextCoalSection; } 261 const MCSection *getConstTextCoalSection() const { 262 return ConstTextCoalSection; 263 } 264 const MCSection *getConstDataSection() const { return ConstDataSection; } 265 const MCSection *getDataCoalSection() const { return DataCoalSection; } 266 const MCSection *getDataCommonSection() const { return DataCommonSection; } 267 const MCSection *getDataBSSSection() const { return DataBSSSection; } 268 const MCSection *getFourByteConstantSection() const { 269 return FourByteConstantSection; 270 } 271 const MCSection *getEightByteConstantSection() const { 272 return EightByteConstantSection; 273 } 274 const MCSection *getSixteenByteConstantSection() const { 275 return SixteenByteConstantSection; 276 } 277 const MCSection *getLazySymbolPointerSection() const { 278 return LazySymbolPointerSection; 279 } 280 const MCSection *getNonLazySymbolPointerSection() const { 281 return NonLazySymbolPointerSection; 282 } 283 284 /// COFF specific sections. 285 /// 286 const MCSection *getDrectveSection() const { return DrectveSection; } 287 const MCSection *getPDataSection() const { return PDataSection; } 288 const MCSection *getXDataSection() const { return XDataSection; } 289 290 const MCSection *getEHFrameSection() { 291 if (!EHFrameSection) 292 InitEHFrameSection(); 293 return EHFrameSection; 294 } 295 296private: 297 enum Environment { IsMachO, IsELF, IsCOFF }; 298 Environment Env; 299 Reloc::Model RelocM; 300 CodeModel::Model CMModel; 301 MCContext *Ctx; 302 303 void InitMachOMCObjectFileInfo(Triple T); 304 void InitELFMCObjectFileInfo(Triple T); 305 void InitCOFFMCObjectFileInfo(Triple T); 306 307 /// InitEHFrameSection - Initialize EHFrameSection on demand. 308 /// 309 void InitEHFrameSection(); 310}; 311 312} // end namespace llvm 313 314#endif 315