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 class StringRef; 24 25 class MCObjectFileInfo { 26 protected: 27 /// CommDirectiveSupportsAlignment - True if .comm supports alignment. This 28 /// is a hack for as long as we support 10.4 Tiger, whose assembler doesn't 29 /// support alignment on comm. 30 bool CommDirectiveSupportsAlignment; 31 32 /// SupportsWeakEmptyEHFrame - True if target object file supports a 33 /// weak_definition of constant 0 for an omitted EH frame. 34 bool SupportsWeakOmittedEHFrame; 35 36 /// SupportsCompactUnwindWithoutEHFrame - True if the target object file 37 /// supports emitting a compact unwind section without an associated EH frame 38 /// section. 39 bool SupportsCompactUnwindWithoutEHFrame; 40 41 /// PersonalityEncoding, LSDAEncoding, TTypeEncoding - Some encoding values 42 /// for EH. 43 unsigned PersonalityEncoding; 44 unsigned LSDAEncoding; 45 unsigned FDECFIEncoding; 46 unsigned TTypeEncoding; 47 48 /// Section flags for eh_frame 49 unsigned EHSectionType; 50 unsigned EHSectionFlags; 51 52 /// CompactUnwindDwarfEHFrameOnly - Compact unwind encoding indicating that we 53 /// should emit only an EH frame. 54 unsigned CompactUnwindDwarfEHFrameOnly; 55 56 /// TextSection - Section directive for standard text. 57 /// 58 const MCSection *TextSection; 59 60 /// DataSection - Section directive for standard data. 61 /// 62 const MCSection *DataSection; 63 64 /// BSSSection - Section that is default initialized to zero. 65 const MCSection *BSSSection; 66 67 /// ReadOnlySection - Section that is readonly and can contain arbitrary 68 /// initialized data. Targets are not required to have a readonly section. 69 /// If they don't, various bits of code will fall back to using the data 70 /// section for constants. 71 const MCSection *ReadOnlySection; 72 73 /// StaticCtorSection - This section contains the static constructor pointer 74 /// list. 75 const MCSection *StaticCtorSection; 76 77 /// StaticDtorSection - This section contains the static destructor pointer 78 /// list. 79 const MCSection *StaticDtorSection; 80 81 /// LSDASection - If exception handling is supported by the target, this is 82 /// the section the Language Specific Data Area information is emitted to. 83 const MCSection *LSDASection; 84 85 /// CompactUnwindSection - If exception handling is supported by the target 86 /// and the target can support a compact representation of the CIE and FDE, 87 /// this is the section to emit them into. 88 const MCSection *CompactUnwindSection; 89 90 // Dwarf sections for debug info. If a target supports debug info, these must 91 // be set. 92 const MCSection *DwarfAbbrevSection; 93 const MCSection *DwarfInfoSection; 94 const MCSection *DwarfLineSection; 95 const MCSection *DwarfFrameSection; 96 const MCSection *DwarfPubTypesSection; 97 const MCSection *DwarfDebugInlineSection; 98 const MCSection *DwarfStrSection; 99 const MCSection *DwarfLocSection; 100 const MCSection *DwarfARangesSection; 101 const MCSection *DwarfRangesSection; 102 const MCSection *DwarfMacroInfoSection; 103 // The pubnames section is no longer generated by default. The generation 104 // can be enabled by a compiler flag. 105 const MCSection *DwarfPubNamesSection; 106 107 // DWARF5 Experimental Debug Info Sections 108 /// DwarfAccelNamesSection, DwarfAccelObjCSection, 109 /// DwarfAccelNamespaceSection, DwarfAccelTypesSection - 110 /// If we use the DWARF accelerated hash tables then we want to emit these 111 /// sections. 112 const MCSection *DwarfAccelNamesSection; 113 const MCSection *DwarfAccelObjCSection; 114 const MCSection *DwarfAccelNamespaceSection; 115 const MCSection *DwarfAccelTypesSection; 116 117 /// These are used for the Fission separate debug information files. 118 const MCSection *DwarfInfoDWOSection; 119 const MCSection *DwarfTypesDWOSection; 120 const MCSection *DwarfAbbrevDWOSection; 121 const MCSection *DwarfStrDWOSection; 122 const MCSection *DwarfLineDWOSection; 123 const MCSection *DwarfLocDWOSection; 124 const MCSection *DwarfStrOffDWOSection; 125 const MCSection *DwarfAddrSection; 126 127 /// Sections for newer gnu pubnames and pubtypes. 128 const MCSection *DwarfGnuPubNamesSection; 129 const MCSection *DwarfGnuPubTypesSection; 130 131 const MCSection *COFFDebugSymbolsSection; 132 133 // Extra TLS Variable Data section. If the target needs to put additional 134 // information for a TLS variable, it'll go here. 135 const MCSection *TLSExtraDataSection; 136 137 /// TLSDataSection - Section directive for Thread Local data. 138 /// ELF, MachO and COFF. 139 const MCSection *TLSDataSection; // Defaults to ".tdata". 140 141 /// TLSBSSSection - Section directive for Thread Local uninitialized data. 142 /// Null if this target doesn't support a BSS section. 143 /// ELF and MachO only. 144 const MCSection *TLSBSSSection; // Defaults to ".tbss". 145 146 /// StackMap section. 147 const MCSection *StackMapSection; 148 149 /// EHFrameSection - EH frame section. It is initialized on demand so it 150 /// can be overwritten (with uniquing). 151 const MCSection *EHFrameSection; 152 153 /// ELF specific sections. 154 /// 155 const MCSection *DataRelSection; 156 const MCSection *DataRelLocalSection; 157 const MCSection *DataRelROSection; 158 const MCSection *DataRelROLocalSection; 159 const MCSection *MergeableConst4Section; 160 const MCSection *MergeableConst8Section; 161 const MCSection *MergeableConst16Section; 162 163 /// MachO specific sections. 164 /// 165 166 /// TLSTLVSection - Section for thread local structure information. 167 /// Contains the source code name of the variable, visibility and a pointer 168 /// to the initial value (.tdata or .tbss). 169 const MCSection *TLSTLVSection; // Defaults to ".tlv". 170 171 /// TLSThreadInitSection - Section for thread local data initialization 172 /// functions. 173 const MCSection *TLSThreadInitSection; // Defaults to ".thread_init_func". 174 175 const MCSection *CStringSection; 176 const MCSection *UStringSection; 177 const MCSection *TextCoalSection; 178 const MCSection *ConstTextCoalSection; 179 const MCSection *ConstDataSection; 180 const MCSection *DataCoalSection; 181 const MCSection *DataCommonSection; 182 const MCSection *DataBSSSection; 183 const MCSection *FourByteConstantSection; 184 const MCSection *EightByteConstantSection; 185 const MCSection *SixteenByteConstantSection; 186 const MCSection *LazySymbolPointerSection; 187 const MCSection *NonLazySymbolPointerSection; 188 189 /// COFF specific sections. 190 /// 191 const MCSection *DrectveSection; 192 const MCSection *PDataSection; 193 const MCSection *XDataSection; 194 195 public: 196 void InitMCObjectFileInfo(StringRef TT, Reloc::Model RM, CodeModel::Model CM, 197 MCContext &ctx); 198 getSupportsWeakOmittedEHFrame()199 bool getSupportsWeakOmittedEHFrame() const { 200 return SupportsWeakOmittedEHFrame; 201 } getSupportsCompactUnwindWithoutEHFrame()202 bool getSupportsCompactUnwindWithoutEHFrame() const { 203 return SupportsCompactUnwindWithoutEHFrame; 204 } getCommDirectiveSupportsAlignment()205 bool getCommDirectiveSupportsAlignment() const { 206 return CommDirectiveSupportsAlignment; 207 } 208 getPersonalityEncoding()209 unsigned getPersonalityEncoding() const { return PersonalityEncoding; } getLSDAEncoding()210 unsigned getLSDAEncoding() const { return LSDAEncoding; } getFDEEncoding()211 unsigned getFDEEncoding() const { return FDECFIEncoding; } getTTypeEncoding()212 unsigned getTTypeEncoding() const { return TTypeEncoding; } 213 getCompactUnwindDwarfEHFrameOnly()214 unsigned getCompactUnwindDwarfEHFrameOnly() const { 215 return CompactUnwindDwarfEHFrameOnly; 216 } 217 getTextSection()218 const MCSection *getTextSection() const { return TextSection; } getDataSection()219 const MCSection *getDataSection() const { return DataSection; } getBSSSection()220 const MCSection *getBSSSection() const { return BSSSection; } getLSDASection()221 const MCSection *getLSDASection() const { return LSDASection; } getCompactUnwindSection()222 const MCSection *getCompactUnwindSection() const{ 223 return CompactUnwindSection; 224 } getDwarfAbbrevSection()225 const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; } getDwarfInfoSection()226 const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; } getDwarfLineSection()227 const MCSection *getDwarfLineSection() const { return DwarfLineSection; } getDwarfFrameSection()228 const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; } getDwarfPubNamesSection()229 const MCSection *getDwarfPubNamesSection() const{return DwarfPubNamesSection;} getDwarfPubTypesSection()230 const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;} getDwarfGnuPubNamesSection()231 const MCSection *getDwarfGnuPubNamesSection() const { 232 return DwarfGnuPubNamesSection; 233 } getDwarfGnuPubTypesSection()234 const MCSection *getDwarfGnuPubTypesSection() const { 235 return DwarfGnuPubTypesSection; 236 } getDwarfDebugInlineSection()237 const MCSection *getDwarfDebugInlineSection() const { 238 return DwarfDebugInlineSection; 239 } getDwarfStrSection()240 const MCSection *getDwarfStrSection() const { return DwarfStrSection; } getDwarfLocSection()241 const MCSection *getDwarfLocSection() const { return DwarfLocSection; } getDwarfARangesSection()242 const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;} getDwarfRangesSection()243 const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; } getDwarfMacroInfoSection()244 const MCSection *getDwarfMacroInfoSection() const { 245 return DwarfMacroInfoSection; 246 } 247 248 // DWARF5 Experimental Debug Info Sections getDwarfAccelNamesSection()249 const MCSection *getDwarfAccelNamesSection() const { 250 return DwarfAccelNamesSection; 251 } getDwarfAccelObjCSection()252 const MCSection *getDwarfAccelObjCSection() const { 253 return DwarfAccelObjCSection; 254 } getDwarfAccelNamespaceSection()255 const MCSection *getDwarfAccelNamespaceSection() const { 256 return DwarfAccelNamespaceSection; 257 } getDwarfAccelTypesSection()258 const MCSection *getDwarfAccelTypesSection() const { 259 return DwarfAccelTypesSection; 260 } getDwarfInfoDWOSection()261 const MCSection *getDwarfInfoDWOSection() const { 262 return DwarfInfoDWOSection; 263 } 264 const MCSection *getDwarfTypesSection(uint64_t Hash) const; getDwarfTypesDWOSection()265 const MCSection *getDwarfTypesDWOSection() const { 266 return DwarfTypesDWOSection; 267 } getDwarfAbbrevDWOSection()268 const MCSection *getDwarfAbbrevDWOSection() const { 269 return DwarfAbbrevDWOSection; 270 } getDwarfStrDWOSection()271 const MCSection *getDwarfStrDWOSection() const { 272 return DwarfStrDWOSection; 273 } getDwarfLineDWOSection()274 const MCSection *getDwarfLineDWOSection() const { 275 return DwarfLineDWOSection; 276 } getDwarfLocDWOSection()277 const MCSection *getDwarfLocDWOSection() const { 278 return DwarfLocDWOSection; 279 } getDwarfStrOffDWOSection()280 const MCSection *getDwarfStrOffDWOSection() const { 281 return DwarfStrOffDWOSection; 282 } getDwarfAddrSection()283 const MCSection *getDwarfAddrSection() const { 284 return DwarfAddrSection; 285 } 286 getCOFFDebugSymbolsSection()287 const MCSection *getCOFFDebugSymbolsSection() const { 288 return COFFDebugSymbolsSection; 289 } 290 getTLSExtraDataSection()291 const MCSection *getTLSExtraDataSection() const { 292 return TLSExtraDataSection; 293 } getTLSDataSection()294 const MCSection *getTLSDataSection() const { return TLSDataSection; } getTLSBSSSection()295 const MCSection *getTLSBSSSection() const { return TLSBSSSection; } 296 getStackMapSection()297 const MCSection *getStackMapSection() const { return StackMapSection; } 298 299 /// ELF specific sections. 300 /// getDataRelSection()301 const MCSection *getDataRelSection() const { return DataRelSection; } getDataRelLocalSection()302 const MCSection *getDataRelLocalSection() const { 303 return DataRelLocalSection; 304 } getDataRelROSection()305 const MCSection *getDataRelROSection() const { return DataRelROSection; } getDataRelROLocalSection()306 const MCSection *getDataRelROLocalSection() const { 307 return DataRelROLocalSection; 308 } getMergeableConst4Section()309 const MCSection *getMergeableConst4Section() const { 310 return MergeableConst4Section; 311 } getMergeableConst8Section()312 const MCSection *getMergeableConst8Section() const { 313 return MergeableConst8Section; 314 } getMergeableConst16Section()315 const MCSection *getMergeableConst16Section() const { 316 return MergeableConst16Section; 317 } 318 319 /// MachO specific sections. 320 /// getTLSTLVSection()321 const MCSection *getTLSTLVSection() const { return TLSTLVSection; } getTLSThreadInitSection()322 const MCSection *getTLSThreadInitSection() const { 323 return TLSThreadInitSection; 324 } getCStringSection()325 const MCSection *getCStringSection() const { return CStringSection; } getUStringSection()326 const MCSection *getUStringSection() const { return UStringSection; } getTextCoalSection()327 const MCSection *getTextCoalSection() const { return TextCoalSection; } getConstTextCoalSection()328 const MCSection *getConstTextCoalSection() const { 329 return ConstTextCoalSection; 330 } getConstDataSection()331 const MCSection *getConstDataSection() const { return ConstDataSection; } getDataCoalSection()332 const MCSection *getDataCoalSection() const { return DataCoalSection; } getDataCommonSection()333 const MCSection *getDataCommonSection() const { return DataCommonSection; } getDataBSSSection()334 const MCSection *getDataBSSSection() const { return DataBSSSection; } getFourByteConstantSection()335 const MCSection *getFourByteConstantSection() const { 336 return FourByteConstantSection; 337 } getEightByteConstantSection()338 const MCSection *getEightByteConstantSection() const { 339 return EightByteConstantSection; 340 } getSixteenByteConstantSection()341 const MCSection *getSixteenByteConstantSection() const { 342 return SixteenByteConstantSection; 343 } getLazySymbolPointerSection()344 const MCSection *getLazySymbolPointerSection() const { 345 return LazySymbolPointerSection; 346 } getNonLazySymbolPointerSection()347 const MCSection *getNonLazySymbolPointerSection() const { 348 return NonLazySymbolPointerSection; 349 } 350 351 /// COFF specific sections. 352 /// getDrectveSection()353 const MCSection *getDrectveSection() const { return DrectveSection; } getPDataSection()354 const MCSection *getPDataSection() const { return PDataSection; } getXDataSection()355 const MCSection *getXDataSection() const { return XDataSection; } 356 getEHFrameSection()357 const MCSection *getEHFrameSection() { 358 if (!EHFrameSection) 359 InitEHFrameSection(); 360 return EHFrameSection; 361 } 362 363 enum Environment { IsMachO, IsELF, IsCOFF }; getObjectFileType()364 Environment getObjectFileType() const { 365 return Env; 366 } 367 getRelocM()368 Reloc::Model getRelocM() const { 369 return RelocM; 370 } 371 372 private: 373 Environment Env; 374 Reloc::Model RelocM; 375 CodeModel::Model CMModel; 376 MCContext *Ctx; 377 Triple TT; 378 379 void InitMachOMCObjectFileInfo(Triple T); 380 void InitELFMCObjectFileInfo(Triple T); 381 void InitCOFFMCObjectFileInfo(Triple T); 382 383 /// InitEHFrameSection - Initialize EHFrameSection on demand. 384 /// 385 void InitEHFrameSection(); 386 387 public: getTargetTriple()388 const Triple &getTargetTriple() const { return TT; } 389 }; 390 391 } // end namespace llvm 392 393 #endif 394