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_MCOBJECTFILEINFO_H 15 #define LLVM_MC_MCOBJECTFILEINFO_H 16 17 #include "llvm/ADT/Triple.h" 18 #include "llvm/Support/CodeGen.h" 19 20 namespace llvm { 21 class MCContext; 22 class MCSection; 23 24 class MCObjectFileInfo { 25 protected: 26 /// True if .comm supports alignment. This is a hack for as long as we 27 /// support 10.4 Tiger, whose assembler doesn't support alignment on comm. 28 bool CommDirectiveSupportsAlignment; 29 30 /// True if target object file supports a weak_definition of constant 0 for an 31 /// omitted EH frame. 32 bool SupportsWeakOmittedEHFrame; 33 34 /// True if the target object file supports emitting a compact unwind section 35 /// without an associated EH frame section. 36 bool SupportsCompactUnwindWithoutEHFrame; 37 38 /// OmitDwarfIfHaveCompactUnwind - True if the target object file 39 /// supports having some functions with compact unwind and other with 40 /// dwarf unwind. 41 bool OmitDwarfIfHaveCompactUnwind; 42 43 /// PersonalityEncoding, LSDAEncoding, TTypeEncoding - Some encoding values 44 /// for EH. 45 unsigned PersonalityEncoding; 46 unsigned LSDAEncoding; 47 unsigned FDECFIEncoding; 48 unsigned TTypeEncoding; 49 50 /// Compact unwind encoding indicating that we should emit only an EH frame. 51 unsigned CompactUnwindDwarfEHFrameOnly; 52 53 /// Section directive for standard text. 54 MCSection *TextSection; 55 56 /// Section directive for standard data. 57 MCSection *DataSection; 58 59 /// Section that is default initialized to zero. 60 MCSection *BSSSection; 61 62 /// Section that is readonly and can contain arbitrary initialized data. 63 /// Targets are not required to have a readonly section. If they don't, 64 /// various bits of code will fall back to using the data section for 65 /// constants. 66 MCSection *ReadOnlySection; 67 68 /// This section contains the static constructor pointer list. 69 MCSection *StaticCtorSection; 70 71 /// This section contains the static destructor pointer list. 72 MCSection *StaticDtorSection; 73 74 /// If exception handling is supported by the target, this is the section the 75 /// Language Specific Data Area information is emitted to. 76 MCSection *LSDASection; 77 78 /// If exception handling is supported by the target and the target can 79 /// support a compact representation of the CIE and FDE, this is the section 80 /// to emit them into. 81 MCSection *CompactUnwindSection; 82 83 // Dwarf sections for debug info. If a target supports debug info, these must 84 // be set. 85 MCSection *DwarfAbbrevSection; 86 MCSection *DwarfInfoSection; 87 MCSection *DwarfLineSection; 88 MCSection *DwarfFrameSection; 89 MCSection *DwarfPubTypesSection; 90 const MCSection *DwarfDebugInlineSection; 91 MCSection *DwarfStrSection; 92 MCSection *DwarfLocSection; 93 MCSection *DwarfARangesSection; 94 MCSection *DwarfRangesSection; 95 // The pubnames section is no longer generated by default. The generation 96 // can be enabled by a compiler flag. 97 MCSection *DwarfPubNamesSection; 98 99 /// DWARF5 Experimental Debug Info Sections 100 /// DwarfAccelNamesSection, DwarfAccelObjCSection, 101 /// DwarfAccelNamespaceSection, DwarfAccelTypesSection - 102 /// If we use the DWARF accelerated hash tables then we want to emit these 103 /// sections. 104 MCSection *DwarfAccelNamesSection; 105 MCSection *DwarfAccelObjCSection; 106 MCSection *DwarfAccelNamespaceSection; 107 MCSection *DwarfAccelTypesSection; 108 109 // These are used for the Fission separate debug information files. 110 MCSection *DwarfInfoDWOSection; 111 MCSection *DwarfTypesDWOSection; 112 MCSection *DwarfAbbrevDWOSection; 113 MCSection *DwarfStrDWOSection; 114 MCSection *DwarfLineDWOSection; 115 MCSection *DwarfLocDWOSection; 116 MCSection *DwarfStrOffDWOSection; 117 MCSection *DwarfAddrSection; 118 119 // These are for Fission DWP files. 120 MCSection *DwarfCUIndexSection; 121 MCSection *DwarfTUIndexSection; 122 123 /// Section for newer gnu pubnames. 124 MCSection *DwarfGnuPubNamesSection; 125 /// Section for newer gnu pubtypes. 126 MCSection *DwarfGnuPubTypesSection; 127 128 MCSection *COFFDebugSymbolsSection; 129 130 /// Extra TLS Variable Data section. 131 /// 132 /// If the target needs to put additional information for a TLS variable, 133 /// it'll go here. 134 MCSection *TLSExtraDataSection; 135 136 /// Section directive for Thread Local data. ELF, MachO and COFF. 137 MCSection *TLSDataSection; // Defaults to ".tdata". 138 139 /// Section directive for Thread Local uninitialized data. 140 /// 141 /// Null if this target doesn't support a BSS section. ELF and MachO only. 142 MCSection *TLSBSSSection; // Defaults to ".tbss". 143 144 /// StackMap section. 145 MCSection *StackMapSection; 146 147 /// FaultMap section. 148 MCSection *FaultMapSection; 149 150 /// EH frame section. 151 /// 152 /// It is initialized on demand so it can be overwritten (with uniquing). 153 MCSection *EHFrameSection; 154 155 // ELF specific sections. 156 MCSection *DataRelROSection; 157 MCSection *MergeableConst4Section; 158 MCSection *MergeableConst8Section; 159 MCSection *MergeableConst16Section; 160 161 // MachO specific sections. 162 163 /// Section for thread local structure information. 164 /// 165 /// Contains the source code name of the variable, visibility and a pointer to 166 /// the initial value (.tdata or .tbss). 167 MCSection *TLSTLVSection; // Defaults to ".tlv". 168 169 /// Section for thread local data initialization functions. 170 const MCSection *TLSThreadInitSection; // Defaults to ".thread_init_func". 171 172 MCSection *CStringSection; 173 MCSection *UStringSection; 174 MCSection *TextCoalSection; 175 MCSection *ConstTextCoalSection; 176 MCSection *ConstDataSection; 177 MCSection *DataCoalSection; 178 MCSection *DataCommonSection; 179 MCSection *DataBSSSection; 180 MCSection *FourByteConstantSection; 181 MCSection *EightByteConstantSection; 182 MCSection *SixteenByteConstantSection; 183 MCSection *LazySymbolPointerSection; 184 MCSection *NonLazySymbolPointerSection; 185 186 /// COFF specific sections. 187 MCSection *DrectveSection; 188 MCSection *PDataSection; 189 MCSection *XDataSection; 190 MCSection *SXDataSection; 191 192 public: 193 void InitMCObjectFileInfo(const Triple &TT, Reloc::Model RM, 194 CodeModel::Model CM, MCContext &ctx); 195 LLVM_ATTRIBUTE_DEPRECATED( 196 void InitMCObjectFileInfo(StringRef TT, Reloc::Model RM, 197 CodeModel::Model CM, MCContext &ctx), 198 "StringRef GNU Triple argument replaced by a llvm::Triple object"); 199 getSupportsWeakOmittedEHFrame()200 bool getSupportsWeakOmittedEHFrame() const { 201 return SupportsWeakOmittedEHFrame; 202 } getSupportsCompactUnwindWithoutEHFrame()203 bool getSupportsCompactUnwindWithoutEHFrame() const { 204 return SupportsCompactUnwindWithoutEHFrame; 205 } getOmitDwarfIfHaveCompactUnwind()206 bool getOmitDwarfIfHaveCompactUnwind() const { 207 return OmitDwarfIfHaveCompactUnwind; 208 } 209 getCommDirectiveSupportsAlignment()210 bool getCommDirectiveSupportsAlignment() const { 211 return CommDirectiveSupportsAlignment; 212 } 213 getPersonalityEncoding()214 unsigned getPersonalityEncoding() const { return PersonalityEncoding; } getLSDAEncoding()215 unsigned getLSDAEncoding() const { return LSDAEncoding; } getFDEEncoding()216 unsigned getFDEEncoding() const { return FDECFIEncoding; } getTTypeEncoding()217 unsigned getTTypeEncoding() const { return TTypeEncoding; } 218 getCompactUnwindDwarfEHFrameOnly()219 unsigned getCompactUnwindDwarfEHFrameOnly() const { 220 return CompactUnwindDwarfEHFrameOnly; 221 } 222 getTextSection()223 MCSection *getTextSection() const { return TextSection; } getDataSection()224 MCSection *getDataSection() const { return DataSection; } getBSSSection()225 MCSection *getBSSSection() const { return BSSSection; } getReadOnlySection()226 MCSection *getReadOnlySection() const { return ReadOnlySection; } getLSDASection()227 MCSection *getLSDASection() const { return LSDASection; } getCompactUnwindSection()228 MCSection *getCompactUnwindSection() const { return CompactUnwindSection; } getDwarfAbbrevSection()229 MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; } getDwarfInfoSection()230 MCSection *getDwarfInfoSection() const { return DwarfInfoSection; } getDwarfLineSection()231 MCSection *getDwarfLineSection() const { return DwarfLineSection; } getDwarfFrameSection()232 MCSection *getDwarfFrameSection() const { return DwarfFrameSection; } getDwarfPubNamesSection()233 MCSection *getDwarfPubNamesSection() const { return DwarfPubNamesSection; } getDwarfPubTypesSection()234 MCSection *getDwarfPubTypesSection() const { return DwarfPubTypesSection; } getDwarfGnuPubNamesSection()235 MCSection *getDwarfGnuPubNamesSection() const { 236 return DwarfGnuPubNamesSection; 237 } getDwarfGnuPubTypesSection()238 MCSection *getDwarfGnuPubTypesSection() const { 239 return DwarfGnuPubTypesSection; 240 } getDwarfDebugInlineSection()241 const MCSection *getDwarfDebugInlineSection() const { 242 return DwarfDebugInlineSection; 243 } getDwarfStrSection()244 MCSection *getDwarfStrSection() const { return DwarfStrSection; } getDwarfLocSection()245 MCSection *getDwarfLocSection() const { return DwarfLocSection; } getDwarfARangesSection()246 MCSection *getDwarfARangesSection() const { return DwarfARangesSection; } getDwarfRangesSection()247 MCSection *getDwarfRangesSection() const { return DwarfRangesSection; } 248 249 // DWARF5 Experimental Debug Info Sections getDwarfAccelNamesSection()250 MCSection *getDwarfAccelNamesSection() const { 251 return DwarfAccelNamesSection; 252 } getDwarfAccelObjCSection()253 MCSection *getDwarfAccelObjCSection() const { return DwarfAccelObjCSection; } getDwarfAccelNamespaceSection()254 MCSection *getDwarfAccelNamespaceSection() const { 255 return DwarfAccelNamespaceSection; 256 } getDwarfAccelTypesSection()257 MCSection *getDwarfAccelTypesSection() const { 258 return DwarfAccelTypesSection; 259 } getDwarfInfoDWOSection()260 MCSection *getDwarfInfoDWOSection() const { return DwarfInfoDWOSection; } 261 MCSection *getDwarfTypesSection(uint64_t Hash) const; getDwarfTypesDWOSection()262 MCSection *getDwarfTypesDWOSection() const { return DwarfTypesDWOSection; } getDwarfAbbrevDWOSection()263 MCSection *getDwarfAbbrevDWOSection() const { return DwarfAbbrevDWOSection; } getDwarfStrDWOSection()264 MCSection *getDwarfStrDWOSection() const { return DwarfStrDWOSection; } getDwarfLineDWOSection()265 MCSection *getDwarfLineDWOSection() const { return DwarfLineDWOSection; } getDwarfLocDWOSection()266 MCSection *getDwarfLocDWOSection() const { return DwarfLocDWOSection; } getDwarfStrOffDWOSection()267 MCSection *getDwarfStrOffDWOSection() const { return DwarfStrOffDWOSection; } getDwarfAddrSection()268 MCSection *getDwarfAddrSection() const { return DwarfAddrSection; } getDwarfCUIndexSection()269 MCSection *getDwarfCUIndexSection() const { return DwarfCUIndexSection; } getDwarfTUIndexSection()270 MCSection *getDwarfTUIndexSection() const { return DwarfTUIndexSection; } 271 getCOFFDebugSymbolsSection()272 MCSection *getCOFFDebugSymbolsSection() const { 273 return COFFDebugSymbolsSection; 274 } 275 getTLSExtraDataSection()276 MCSection *getTLSExtraDataSection() const { return TLSExtraDataSection; } getTLSDataSection()277 const MCSection *getTLSDataSection() const { return TLSDataSection; } getTLSBSSSection()278 MCSection *getTLSBSSSection() const { return TLSBSSSection; } 279 getStackMapSection()280 MCSection *getStackMapSection() const { return StackMapSection; } getFaultMapSection()281 MCSection *getFaultMapSection() const { return FaultMapSection; } 282 283 // ELF specific sections. getDataRelROSection()284 MCSection *getDataRelROSection() const { return DataRelROSection; } getMergeableConst4Section()285 const MCSection *getMergeableConst4Section() const { 286 return MergeableConst4Section; 287 } getMergeableConst8Section()288 const MCSection *getMergeableConst8Section() const { 289 return MergeableConst8Section; 290 } getMergeableConst16Section()291 const MCSection *getMergeableConst16Section() const { 292 return MergeableConst16Section; 293 } 294 295 // MachO specific sections. getTLSTLVSection()296 const MCSection *getTLSTLVSection() const { return TLSTLVSection; } getTLSThreadInitSection()297 const MCSection *getTLSThreadInitSection() const { 298 return TLSThreadInitSection; 299 } getCStringSection()300 const MCSection *getCStringSection() const { return CStringSection; } getUStringSection()301 const MCSection *getUStringSection() const { return UStringSection; } getTextCoalSection()302 MCSection *getTextCoalSection() const { return TextCoalSection; } getConstTextCoalSection()303 const MCSection *getConstTextCoalSection() const { 304 return ConstTextCoalSection; 305 } getConstDataSection()306 const MCSection *getConstDataSection() const { return ConstDataSection; } getDataCoalSection()307 const MCSection *getDataCoalSection() const { return DataCoalSection; } getDataCommonSection()308 const MCSection *getDataCommonSection() const { return DataCommonSection; } getDataBSSSection()309 MCSection *getDataBSSSection() const { return DataBSSSection; } getFourByteConstantSection()310 const MCSection *getFourByteConstantSection() const { 311 return FourByteConstantSection; 312 } getEightByteConstantSection()313 const MCSection *getEightByteConstantSection() const { 314 return EightByteConstantSection; 315 } getSixteenByteConstantSection()316 const MCSection *getSixteenByteConstantSection() const { 317 return SixteenByteConstantSection; 318 } getLazySymbolPointerSection()319 MCSection *getLazySymbolPointerSection() const { 320 return LazySymbolPointerSection; 321 } getNonLazySymbolPointerSection()322 MCSection *getNonLazySymbolPointerSection() const { 323 return NonLazySymbolPointerSection; 324 } 325 326 // COFF specific sections. getDrectveSection()327 MCSection *getDrectveSection() const { return DrectveSection; } getPDataSection()328 MCSection *getPDataSection() const { return PDataSection; } getXDataSection()329 MCSection *getXDataSection() const { return XDataSection; } getSXDataSection()330 MCSection *getSXDataSection() const { return SXDataSection; } 331 getEHFrameSection()332 MCSection *getEHFrameSection() { 333 return EHFrameSection; 334 } 335 336 enum Environment { IsMachO, IsELF, IsCOFF }; getObjectFileType()337 Environment getObjectFileType() const { return Env; } 338 getRelocM()339 Reloc::Model getRelocM() const { return RelocM; } 340 341 private: 342 Environment Env; 343 Reloc::Model RelocM; 344 CodeModel::Model CMModel; 345 MCContext *Ctx; 346 Triple TT; 347 348 void initMachOMCObjectFileInfo(Triple T); 349 void initELFMCObjectFileInfo(Triple T); 350 void initCOFFMCObjectFileInfo(Triple T); 351 352 public: getTargetTriple()353 const Triple &getTargetTriple() const { return TT; } 354 }; 355 356 } // end namespace llvm 357 358 #endif 359