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 20namespace llvm { 21class MCContext; 22class MCSection; 23 24class MCObjectFileInfo { 25protected: 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 MCSection *COFFDebugSymbolsSection; 127 MCSection *COFFDebugTypesSection; 128 129 /// Extra TLS Variable Data section. 130 /// 131 /// If the target needs to put additional information for a TLS variable, 132 /// it'll go here. 133 MCSection *TLSExtraDataSection; 134 135 /// Section directive for Thread Local data. ELF, MachO, COFF, and Wasm. 136 MCSection *TLSDataSection; // Defaults to ".tdata". 137 138 /// Section directive for Thread Local uninitialized data. 139 /// 140 /// Null if this target doesn't support a BSS section. ELF and MachO only. 141 MCSection *TLSBSSSection; // Defaults to ".tbss". 142 143 /// StackMap section. 144 MCSection *StackMapSection; 145 146 /// FaultMap section. 147 MCSection *FaultMapSection; 148 149 /// EH frame section. 150 /// 151 /// It is initialized on demand so it can be overwritten (with uniquing). 152 MCSection *EHFrameSection; 153 154 // ELF specific sections. 155 MCSection *DataRelROSection; 156 MCSection *MergeableConst4Section; 157 MCSection *MergeableConst8Section; 158 MCSection *MergeableConst16Section; 159 MCSection *MergeableConst32Section; 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 MCSection *ThreadLocalPointerSection; 186 187 /// COFF specific sections. 188 MCSection *DrectveSection; 189 MCSection *PDataSection; 190 MCSection *XDataSection; 191 MCSection *SXDataSection; 192 193public: 194 void InitMCObjectFileInfo(const Triple &TT, bool PIC, CodeModel::Model CM, 195 MCContext &ctx); 196 197 bool getSupportsWeakOmittedEHFrame() const { 198 return SupportsWeakOmittedEHFrame; 199 } 200 bool getSupportsCompactUnwindWithoutEHFrame() const { 201 return SupportsCompactUnwindWithoutEHFrame; 202 } 203 bool getOmitDwarfIfHaveCompactUnwind() const { 204 return OmitDwarfIfHaveCompactUnwind; 205 } 206 207 bool getCommDirectiveSupportsAlignment() const { 208 return CommDirectiveSupportsAlignment; 209 } 210 211 unsigned getPersonalityEncoding() const { return PersonalityEncoding; } 212 unsigned getLSDAEncoding() const { return LSDAEncoding; } 213 unsigned getFDEEncoding() const { return FDECFIEncoding; } 214 unsigned getTTypeEncoding() const { return TTypeEncoding; } 215 216 unsigned getCompactUnwindDwarfEHFrameOnly() const { 217 return CompactUnwindDwarfEHFrameOnly; 218 } 219 220 MCSection *getTextSection() const { return TextSection; } 221 MCSection *getDataSection() const { return DataSection; } 222 MCSection *getBSSSection() const { return BSSSection; } 223 MCSection *getReadOnlySection() const { return ReadOnlySection; } 224 MCSection *getLSDASection() const { return LSDASection; } 225 MCSection *getCompactUnwindSection() const { return CompactUnwindSection; } 226 MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; } 227 MCSection *getDwarfInfoSection() const { return DwarfInfoSection; } 228 MCSection *getDwarfLineSection() const { return DwarfLineSection; } 229 MCSection *getDwarfFrameSection() const { return DwarfFrameSection; } 230 MCSection *getDwarfPubNamesSection() const { return DwarfPubNamesSection; } 231 MCSection *getDwarfPubTypesSection() const { return DwarfPubTypesSection; } 232 MCSection *getDwarfGnuPubNamesSection() const { 233 return DwarfGnuPubNamesSection; 234 } 235 MCSection *getDwarfGnuPubTypesSection() const { 236 return DwarfGnuPubTypesSection; 237 } 238 const MCSection *getDwarfDebugInlineSection() const { 239 return DwarfDebugInlineSection; 240 } 241 MCSection *getDwarfStrSection() const { return DwarfStrSection; } 242 MCSection *getDwarfLocSection() const { return DwarfLocSection; } 243 MCSection *getDwarfARangesSection() const { return DwarfARangesSection; } 244 MCSection *getDwarfRangesSection() const { return DwarfRangesSection; } 245 MCSection *getDwarfMacinfoSection() const { return DwarfMacinfoSection; } 246 247 // DWARF5 Experimental Debug Info Sections 248 MCSection *getDwarfAccelNamesSection() const { 249 return DwarfAccelNamesSection; 250 } 251 MCSection *getDwarfAccelObjCSection() const { return DwarfAccelObjCSection; } 252 MCSection *getDwarfAccelNamespaceSection() const { 253 return DwarfAccelNamespaceSection; 254 } 255 MCSection *getDwarfAccelTypesSection() const { 256 return DwarfAccelTypesSection; 257 } 258 MCSection *getDwarfInfoDWOSection() const { return DwarfInfoDWOSection; } 259 MCSection *getDwarfTypesSection(uint64_t Hash) const; 260 MCSection *getDwarfTypesDWOSection() const { return DwarfTypesDWOSection; } 261 MCSection *getDwarfAbbrevDWOSection() const { return DwarfAbbrevDWOSection; } 262 MCSection *getDwarfStrDWOSection() const { return DwarfStrDWOSection; } 263 MCSection *getDwarfLineDWOSection() const { return DwarfLineDWOSection; } 264 MCSection *getDwarfLocDWOSection() const { return DwarfLocDWOSection; } 265 MCSection *getDwarfStrOffDWOSection() const { return DwarfStrOffDWOSection; } 266 MCSection *getDwarfStrOffSection() const { return DwarfStrOffSection; } 267 MCSection *getDwarfAddrSection() const { return DwarfAddrSection; } 268 MCSection *getDwarfCUIndexSection() const { return DwarfCUIndexSection; } 269 MCSection *getDwarfTUIndexSection() const { return DwarfTUIndexSection; } 270 271 MCSection *getCOFFDebugSymbolsSection() const { 272 return COFFDebugSymbolsSection; 273 } 274 MCSection *getCOFFDebugTypesSection() const { 275 return COFFDebugTypesSection; 276 } 277 278 279 MCSection *getTLSExtraDataSection() const { return TLSExtraDataSection; } 280 const MCSection *getTLSDataSection() const { return TLSDataSection; } 281 MCSection *getTLSBSSSection() const { return TLSBSSSection; } 282 283 MCSection *getStackMapSection() const { return StackMapSection; } 284 MCSection *getFaultMapSection() const { return FaultMapSection; } 285 286 // ELF specific sections. 287 MCSection *getDataRelROSection() const { return DataRelROSection; } 288 const MCSection *getMergeableConst4Section() const { 289 return MergeableConst4Section; 290 } 291 const MCSection *getMergeableConst8Section() const { 292 return MergeableConst8Section; 293 } 294 const MCSection *getMergeableConst16Section() const { 295 return MergeableConst16Section; 296 } 297 const MCSection *getMergeableConst32Section() const { 298 return MergeableConst32Section; 299 } 300 301 // MachO specific sections. 302 const MCSection *getTLSTLVSection() const { return TLSTLVSection; } 303 const MCSection *getTLSThreadInitSection() const { 304 return TLSThreadInitSection; 305 } 306 const MCSection *getCStringSection() const { return CStringSection; } 307 const MCSection *getUStringSection() const { return UStringSection; } 308 MCSection *getTextCoalSection() const { return TextCoalSection; } 309 const MCSection *getConstTextCoalSection() const { 310 return ConstTextCoalSection; 311 } 312 const MCSection *getConstDataSection() const { return ConstDataSection; } 313 const MCSection *getDataCoalSection() const { return DataCoalSection; } 314 const MCSection *getDataCommonSection() const { return DataCommonSection; } 315 MCSection *getDataBSSSection() const { return DataBSSSection; } 316 const MCSection *getFourByteConstantSection() const { 317 return FourByteConstantSection; 318 } 319 const MCSection *getEightByteConstantSection() const { 320 return EightByteConstantSection; 321 } 322 const MCSection *getSixteenByteConstantSection() const { 323 return SixteenByteConstantSection; 324 } 325 MCSection *getLazySymbolPointerSection() const { 326 return LazySymbolPointerSection; 327 } 328 MCSection *getNonLazySymbolPointerSection() const { 329 return NonLazySymbolPointerSection; 330 } 331 MCSection *getThreadLocalPointerSection() const { 332 return ThreadLocalPointerSection; 333 } 334 335 // COFF specific sections. 336 MCSection *getDrectveSection() const { return DrectveSection; } 337 MCSection *getPDataSection() const { return PDataSection; } 338 MCSection *getXDataSection() const { return XDataSection; } 339 MCSection *getSXDataSection() const { return SXDataSection; } 340 341 MCSection *getEHFrameSection() { 342 return EHFrameSection; 343 } 344 345 enum Environment { IsMachO, IsELF, IsCOFF, IsWasm }; 346 Environment getObjectFileType() const { return Env; } 347 348 bool isPositionIndependent() const { return PositionIndependent; } 349 350private: 351 Environment Env; 352 bool PositionIndependent; 353 CodeModel::Model CMModel; 354 MCContext *Ctx; 355 Triple TT; 356 357 void initMachOMCObjectFileInfo(const Triple &T); 358 void initELFMCObjectFileInfo(const Triple &T); 359 void initCOFFMCObjectFileInfo(const Triple &T); 360 void initWasmMCObjectFileInfo(const Triple &T); 361 362public: 363 const Triple &getTargetTriple() const { return TT; } 364}; 365 366} // end namespace llvm 367 368#endif 369