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 MCSection *DwarfMacinfoSection; 96 // The pubnames section is no longer generated by default. The generation 97 // can be enabled by a compiler flag. 98 MCSection *DwarfPubNamesSection; 99 100 /// DWARF5 Experimental Debug Info Sections 101 /// DwarfAccelNamesSection, DwarfAccelObjCSection, 102 /// DwarfAccelNamespaceSection, DwarfAccelTypesSection - 103 /// If we use the DWARF accelerated hash tables then we want to emit these 104 /// sections. 105 MCSection *DwarfAccelNamesSection; 106 MCSection *DwarfAccelObjCSection; 107 MCSection *DwarfAccelNamespaceSection; 108 MCSection *DwarfAccelTypesSection; 109 110 // These are used for the Fission separate debug information files. 111 MCSection *DwarfInfoDWOSection; 112 MCSection *DwarfTypesDWOSection; 113 MCSection *DwarfAbbrevDWOSection; 114 MCSection *DwarfStrDWOSection; 115 MCSection *DwarfLineDWOSection; 116 MCSection *DwarfLocDWOSection; 117 MCSection *DwarfStrOffDWOSection; 118 MCSection *DwarfAddrSection; 119 120 // These are for Fission DWP files. 121 MCSection *DwarfCUIndexSection; 122 MCSection *DwarfTUIndexSection; 123 124 /// Section for newer gnu pubnames. 125 MCSection *DwarfGnuPubNamesSection; 126 /// Section for newer gnu pubtypes. 127 MCSection *DwarfGnuPubTypesSection; 128 129 MCSection *COFFDebugSymbolsSection; 130 MCSection *COFFDebugTypesSection; 131 132 /// Extra TLS Variable Data section. 133 /// 134 /// If the target needs to put additional information for a TLS variable, 135 /// it'll go here. 136 MCSection *TLSExtraDataSection; 137 138 /// Section directive for Thread Local data. ELF, MachO and COFF. 139 MCSection *TLSDataSection; // Defaults to ".tdata". 140 141 /// Section directive for Thread Local uninitialized data. 142 /// 143 /// Null if this target doesn't support a BSS section. ELF and MachO only. 144 MCSection *TLSBSSSection; // Defaults to ".tbss". 145 146 /// StackMap section. 147 MCSection *StackMapSection; 148 149 /// FaultMap section. 150 MCSection *FaultMapSection; 151 152 /// EH frame section. 153 /// 154 /// It is initialized on demand so it can be overwritten (with uniquing). 155 MCSection *EHFrameSection; 156 157 // ELF specific sections. 158 MCSection *DataRelROSection; 159 MCSection *MergeableConst4Section; 160 MCSection *MergeableConst8Section; 161 MCSection *MergeableConst16Section; 162 MCSection *MergeableConst32Section; 163 164 // MachO specific sections. 165 166 /// Section for thread local structure information. 167 /// 168 /// Contains the source code name of the variable, visibility and a pointer to 169 /// the initial value (.tdata or .tbss). 170 MCSection *TLSTLVSection; // Defaults to ".tlv". 171 172 /// Section for thread local data initialization functions. 173 const MCSection *TLSThreadInitSection; // Defaults to ".thread_init_func". 174 175 MCSection *CStringSection; 176 MCSection *UStringSection; 177 MCSection *TextCoalSection; 178 MCSection *ConstTextCoalSection; 179 MCSection *ConstDataSection; 180 MCSection *DataCoalSection; 181 MCSection *DataCommonSection; 182 MCSection *DataBSSSection; 183 MCSection *FourByteConstantSection; 184 MCSection *EightByteConstantSection; 185 MCSection *SixteenByteConstantSection; 186 MCSection *LazySymbolPointerSection; 187 MCSection *NonLazySymbolPointerSection; 188 MCSection *ThreadLocalPointerSection; 189 190 /// COFF specific sections. 191 MCSection *DrectveSection; 192 MCSection *PDataSection; 193 MCSection *XDataSection; 194 MCSection *SXDataSection; 195 196 public: 197 void InitMCObjectFileInfo(const Triple &TT, bool PIC, CodeModel::Model CM, 198 MCContext &ctx); 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; } getDwarfMacinfoSection()248 MCSection *getDwarfMacinfoSection() const { return DwarfMacinfoSection; } 249 250 // DWARF5 Experimental Debug Info Sections getDwarfAccelNamesSection()251 MCSection *getDwarfAccelNamesSection() const { 252 return DwarfAccelNamesSection; 253 } getDwarfAccelObjCSection()254 MCSection *getDwarfAccelObjCSection() const { return DwarfAccelObjCSection; } getDwarfAccelNamespaceSection()255 MCSection *getDwarfAccelNamespaceSection() const { 256 return DwarfAccelNamespaceSection; 257 } getDwarfAccelTypesSection()258 MCSection *getDwarfAccelTypesSection() const { 259 return DwarfAccelTypesSection; 260 } getDwarfInfoDWOSection()261 MCSection *getDwarfInfoDWOSection() const { return DwarfInfoDWOSection; } 262 MCSection *getDwarfTypesSection(uint64_t Hash) const; getDwarfTypesDWOSection()263 MCSection *getDwarfTypesDWOSection() const { return DwarfTypesDWOSection; } getDwarfAbbrevDWOSection()264 MCSection *getDwarfAbbrevDWOSection() const { return DwarfAbbrevDWOSection; } getDwarfStrDWOSection()265 MCSection *getDwarfStrDWOSection() const { return DwarfStrDWOSection; } getDwarfLineDWOSection()266 MCSection *getDwarfLineDWOSection() const { return DwarfLineDWOSection; } getDwarfLocDWOSection()267 MCSection *getDwarfLocDWOSection() const { return DwarfLocDWOSection; } getDwarfStrOffDWOSection()268 MCSection *getDwarfStrOffDWOSection() const { return DwarfStrOffDWOSection; } getDwarfAddrSection()269 MCSection *getDwarfAddrSection() const { return DwarfAddrSection; } getDwarfCUIndexSection()270 MCSection *getDwarfCUIndexSection() const { return DwarfCUIndexSection; } getDwarfTUIndexSection()271 MCSection *getDwarfTUIndexSection() const { return DwarfTUIndexSection; } 272 getCOFFDebugSymbolsSection()273 MCSection *getCOFFDebugSymbolsSection() const { 274 return COFFDebugSymbolsSection; 275 } getCOFFDebugTypesSection()276 MCSection *getCOFFDebugTypesSection() const { 277 return COFFDebugTypesSection; 278 } 279 280 getTLSExtraDataSection()281 MCSection *getTLSExtraDataSection() const { return TLSExtraDataSection; } getTLSDataSection()282 const MCSection *getTLSDataSection() const { return TLSDataSection; } getTLSBSSSection()283 MCSection *getTLSBSSSection() const { return TLSBSSSection; } 284 getStackMapSection()285 MCSection *getStackMapSection() const { return StackMapSection; } getFaultMapSection()286 MCSection *getFaultMapSection() const { return FaultMapSection; } 287 288 // ELF specific sections. getDataRelROSection()289 MCSection *getDataRelROSection() const { return DataRelROSection; } getMergeableConst4Section()290 const MCSection *getMergeableConst4Section() const { 291 return MergeableConst4Section; 292 } getMergeableConst8Section()293 const MCSection *getMergeableConst8Section() const { 294 return MergeableConst8Section; 295 } getMergeableConst16Section()296 const MCSection *getMergeableConst16Section() const { 297 return MergeableConst16Section; 298 } getMergeableConst32Section()299 const MCSection *getMergeableConst32Section() const { 300 return MergeableConst32Section; 301 } 302 303 // MachO specific sections. getTLSTLVSection()304 const MCSection *getTLSTLVSection() const { return TLSTLVSection; } getTLSThreadInitSection()305 const MCSection *getTLSThreadInitSection() const { 306 return TLSThreadInitSection; 307 } getCStringSection()308 const MCSection *getCStringSection() const { return CStringSection; } getUStringSection()309 const MCSection *getUStringSection() const { return UStringSection; } getTextCoalSection()310 MCSection *getTextCoalSection() const { return TextCoalSection; } getConstTextCoalSection()311 const MCSection *getConstTextCoalSection() const { 312 return ConstTextCoalSection; 313 } getConstDataSection()314 const MCSection *getConstDataSection() const { return ConstDataSection; } getDataCoalSection()315 const MCSection *getDataCoalSection() const { return DataCoalSection; } getDataCommonSection()316 const MCSection *getDataCommonSection() const { return DataCommonSection; } getDataBSSSection()317 MCSection *getDataBSSSection() const { return DataBSSSection; } getFourByteConstantSection()318 const MCSection *getFourByteConstantSection() const { 319 return FourByteConstantSection; 320 } getEightByteConstantSection()321 const MCSection *getEightByteConstantSection() const { 322 return EightByteConstantSection; 323 } getSixteenByteConstantSection()324 const MCSection *getSixteenByteConstantSection() const { 325 return SixteenByteConstantSection; 326 } getLazySymbolPointerSection()327 MCSection *getLazySymbolPointerSection() const { 328 return LazySymbolPointerSection; 329 } getNonLazySymbolPointerSection()330 MCSection *getNonLazySymbolPointerSection() const { 331 return NonLazySymbolPointerSection; 332 } getThreadLocalPointerSection()333 MCSection *getThreadLocalPointerSection() const { 334 return ThreadLocalPointerSection; 335 } 336 337 // COFF specific sections. getDrectveSection()338 MCSection *getDrectveSection() const { return DrectveSection; } getPDataSection()339 MCSection *getPDataSection() const { return PDataSection; } getXDataSection()340 MCSection *getXDataSection() const { return XDataSection; } getSXDataSection()341 MCSection *getSXDataSection() const { return SXDataSection; } 342 getEHFrameSection()343 MCSection *getEHFrameSection() { 344 return EHFrameSection; 345 } 346 347 enum Environment { IsMachO, IsELF, IsCOFF }; getObjectFileType()348 Environment getObjectFileType() const { return Env; } 349 isPositionIndependent()350 bool isPositionIndependent() const { return PositionIndependent; } 351 352 private: 353 Environment Env; 354 bool PositionIndependent; 355 CodeModel::Model CMModel; 356 MCContext *Ctx; 357 Triple TT; 358 359 void initMachOMCObjectFileInfo(const Triple &T); 360 void initELFMCObjectFileInfo(const Triple &T); 361 void initCOFFMCObjectFileInfo(const Triple &T); 362 363 public: getTargetTriple()364 const Triple &getTargetTriple() const { return TT; } 365 }; 366 367 } // end namespace llvm 368 369 #endif 370