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 /// If exception handling is supported by the target, this is the section the 69 /// Language Specific Data Area information is emitted to. 70 MCSection *LSDASection; 71 72 /// If exception handling is supported by the target and the target can 73 /// support a compact representation of the CIE and FDE, this is the section 74 /// to emit them into. 75 MCSection *CompactUnwindSection; 76 77 // Dwarf sections for debug info. If a target supports debug info, these must 78 // be set. 79 MCSection *DwarfAbbrevSection; 80 MCSection *DwarfInfoSection; 81 MCSection *DwarfLineSection; 82 MCSection *DwarfFrameSection; 83 MCSection *DwarfPubTypesSection; 84 const MCSection *DwarfDebugInlineSection; 85 MCSection *DwarfStrSection; 86 MCSection *DwarfLocSection; 87 MCSection *DwarfARangesSection; 88 MCSection *DwarfRangesSection; 89 MCSection *DwarfMacinfoSection; 90 // The pubnames section is no longer generated by default. The generation 91 // can be enabled by a compiler flag. 92 MCSection *DwarfPubNamesSection; 93 94 /// DWARF5 Experimental Debug Info Sections 95 /// DwarfAccelNamesSection, DwarfAccelObjCSection, 96 /// DwarfAccelNamespaceSection, DwarfAccelTypesSection - 97 /// If we use the DWARF accelerated hash tables then we want to emit these 98 /// sections. 99 MCSection *DwarfAccelNamesSection; 100 MCSection *DwarfAccelObjCSection; 101 MCSection *DwarfAccelNamespaceSection; 102 MCSection *DwarfAccelTypesSection; 103 104 // These are used for the Fission separate debug information files. 105 MCSection *DwarfInfoDWOSection; 106 MCSection *DwarfTypesDWOSection; 107 MCSection *DwarfAbbrevDWOSection; 108 MCSection *DwarfStrDWOSection; 109 MCSection *DwarfLineDWOSection; 110 MCSection *DwarfLocDWOSection; 111 MCSection *DwarfStrOffDWOSection; 112 113 /// The DWARF v5 string offset and address table sections. 114 MCSection *DwarfStrOffSection; 115 MCSection *DwarfAddrSection; 116 117 // These are for Fission DWP files. 118 MCSection *DwarfCUIndexSection; 119 MCSection *DwarfTUIndexSection; 120 121 /// Section for newer gnu pubnames. 122 MCSection *DwarfGnuPubNamesSection; 123 /// Section for newer gnu pubtypes. 124 MCSection *DwarfGnuPubTypesSection; 125 126 // Section for Swift AST 127 MCSection *DwarfSwiftASTSection; 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, COFF, and Wasm. 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, MCContext &ctx, 198 bool LargeCodeModel = false); 199 200 bool getSupportsWeakOmittedEHFrame() const { 201 return SupportsWeakOmittedEHFrame; 202 } 203 bool getSupportsCompactUnwindWithoutEHFrame() const { 204 return SupportsCompactUnwindWithoutEHFrame; 205 } 206 bool getOmitDwarfIfHaveCompactUnwind() const { 207 return OmitDwarfIfHaveCompactUnwind; 208 } 209 210 bool getCommDirectiveSupportsAlignment() const { 211 return CommDirectiveSupportsAlignment; 212 } 213 214 unsigned getPersonalityEncoding() const { return PersonalityEncoding; } 215 unsigned getLSDAEncoding() const { return LSDAEncoding; } 216 unsigned getFDEEncoding() const { return FDECFIEncoding; } 217 unsigned getTTypeEncoding() const { return TTypeEncoding; } 218 219 unsigned getCompactUnwindDwarfEHFrameOnly() const { 220 return CompactUnwindDwarfEHFrameOnly; 221 } 222 223 MCSection *getTextSection() const { return TextSection; } 224 MCSection *getDataSection() const { return DataSection; } 225 MCSection *getBSSSection() const { return BSSSection; } 226 MCSection *getReadOnlySection() const { return ReadOnlySection; } 227 MCSection *getLSDASection() const { return LSDASection; } 228 MCSection *getCompactUnwindSection() const { return CompactUnwindSection; } 229 MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; } 230 MCSection *getDwarfInfoSection() const { return DwarfInfoSection; } 231 MCSection *getDwarfLineSection() const { return DwarfLineSection; } 232 MCSection *getDwarfFrameSection() const { return DwarfFrameSection; } 233 MCSection *getDwarfPubNamesSection() const { return DwarfPubNamesSection; } 234 MCSection *getDwarfPubTypesSection() const { return DwarfPubTypesSection; } 235 MCSection *getDwarfGnuPubNamesSection() const { 236 return DwarfGnuPubNamesSection; 237 } 238 MCSection *getDwarfGnuPubTypesSection() const { 239 return DwarfGnuPubTypesSection; 240 } 241 const MCSection *getDwarfDebugInlineSection() const { 242 return DwarfDebugInlineSection; 243 } 244 MCSection *getDwarfStrSection() const { return DwarfStrSection; } 245 MCSection *getDwarfLocSection() const { return DwarfLocSection; } 246 MCSection *getDwarfARangesSection() const { return DwarfARangesSection; } 247 MCSection *getDwarfRangesSection() const { return DwarfRangesSection; } 248 MCSection *getDwarfMacinfoSection() const { return DwarfMacinfoSection; } 249 250 // DWARF5 Experimental Debug Info Sections 251 MCSection *getDwarfAccelNamesSection() const { 252 return DwarfAccelNamesSection; 253 } 254 MCSection *getDwarfAccelObjCSection() const { return DwarfAccelObjCSection; } 255 MCSection *getDwarfAccelNamespaceSection() const { 256 return DwarfAccelNamespaceSection; 257 } 258 MCSection *getDwarfAccelTypesSection() const { 259 return DwarfAccelTypesSection; 260 } 261 MCSection *getDwarfInfoDWOSection() const { return DwarfInfoDWOSection; } 262 MCSection *getDwarfTypesSection(uint64_t Hash) const; 263 MCSection *getDwarfTypesDWOSection() const { return DwarfTypesDWOSection; } 264 MCSection *getDwarfAbbrevDWOSection() const { return DwarfAbbrevDWOSection; } 265 MCSection *getDwarfStrDWOSection() const { return DwarfStrDWOSection; } 266 MCSection *getDwarfLineDWOSection() const { return DwarfLineDWOSection; } 267 MCSection *getDwarfLocDWOSection() const { return DwarfLocDWOSection; } 268 MCSection *getDwarfStrOffDWOSection() const { return DwarfStrOffDWOSection; } 269 MCSection *getDwarfStrOffSection() const { return DwarfStrOffSection; } 270 MCSection *getDwarfAddrSection() const { return DwarfAddrSection; } 271 MCSection *getDwarfCUIndexSection() const { return DwarfCUIndexSection; } 272 MCSection *getDwarfTUIndexSection() const { return DwarfTUIndexSection; } 273 MCSection *getDwarfSwiftASTSection() const { return DwarfSwiftASTSection; } 274 275 MCSection *getCOFFDebugSymbolsSection() const { 276 return COFFDebugSymbolsSection; 277 } 278 MCSection *getCOFFDebugTypesSection() const { 279 return COFFDebugTypesSection; 280 } 281 282 283 MCSection *getTLSExtraDataSection() const { return TLSExtraDataSection; } 284 const MCSection *getTLSDataSection() const { return TLSDataSection; } 285 MCSection *getTLSBSSSection() const { return TLSBSSSection; } 286 287 MCSection *getStackMapSection() const { return StackMapSection; } 288 MCSection *getFaultMapSection() const { return FaultMapSection; } 289 290 // ELF specific sections. 291 MCSection *getDataRelROSection() const { return DataRelROSection; } 292 const MCSection *getMergeableConst4Section() const { 293 return MergeableConst4Section; 294 } 295 const MCSection *getMergeableConst8Section() const { 296 return MergeableConst8Section; 297 } 298 const MCSection *getMergeableConst16Section() const { 299 return MergeableConst16Section; 300 } 301 const MCSection *getMergeableConst32Section() const { 302 return MergeableConst32Section; 303 } 304 305 // MachO specific sections. 306 const MCSection *getTLSTLVSection() const { return TLSTLVSection; } 307 const MCSection *getTLSThreadInitSection() const { 308 return TLSThreadInitSection; 309 } 310 const MCSection *getCStringSection() const { return CStringSection; } 311 const MCSection *getUStringSection() const { return UStringSection; } 312 MCSection *getTextCoalSection() const { return TextCoalSection; } 313 const MCSection *getConstTextCoalSection() const { 314 return ConstTextCoalSection; 315 } 316 const MCSection *getConstDataSection() const { return ConstDataSection; } 317 const MCSection *getDataCoalSection() const { return DataCoalSection; } 318 const MCSection *getDataCommonSection() const { return DataCommonSection; } 319 MCSection *getDataBSSSection() const { return DataBSSSection; } 320 const MCSection *getFourByteConstantSection() const { 321 return FourByteConstantSection; 322 } 323 const MCSection *getEightByteConstantSection() const { 324 return EightByteConstantSection; 325 } 326 const MCSection *getSixteenByteConstantSection() const { 327 return SixteenByteConstantSection; 328 } 329 MCSection *getLazySymbolPointerSection() const { 330 return LazySymbolPointerSection; 331 } 332 MCSection *getNonLazySymbolPointerSection() const { 333 return NonLazySymbolPointerSection; 334 } 335 MCSection *getThreadLocalPointerSection() const { 336 return ThreadLocalPointerSection; 337 } 338 339 // COFF specific sections. 340 MCSection *getDrectveSection() const { return DrectveSection; } 341 MCSection *getPDataSection() const { return PDataSection; } 342 MCSection *getXDataSection() const { return XDataSection; } 343 MCSection *getSXDataSection() const { return SXDataSection; } 344 345 MCSection *getEHFrameSection() { 346 return EHFrameSection; 347 } 348 349 enum Environment { IsMachO, IsELF, IsCOFF, IsWasm }; 350 Environment getObjectFileType() const { return Env; } 351 352 bool isPositionIndependent() const { return PositionIndependent; } 353 354 private: 355 Environment Env; 356 bool PositionIndependent; 357 MCContext *Ctx; 358 Triple TT; 359 360 void initMachOMCObjectFileInfo(const Triple &T); 361 void initELFMCObjectFileInfo(const Triple &T, bool Large); 362 void initCOFFMCObjectFileInfo(const Triple &T); 363 void initWasmMCObjectFileInfo(const Triple &T); 364 365 public: 366 const Triple &getTargetTriple() const { return TT; } 367 }; 368 369 } // end namespace llvm 370 371 #endif 372