MCObjectFileInfo.h revision 36b56886974eae4f9c5ebc96befd3e7bfe5de338
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_MCBJECTFILEINFO_H 15#define LLVM_MC_MCBJECTFILEINFO_H 16 17#include "llvm/Support/CodeGen.h" 18 19namespace llvm { 20 class MCContext; 21 class MCSection; 22 class StringRef; 23 class Triple; 24 25class MCObjectFileInfo { 26protected: 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 /// IsFunctionEHFrameSymbolPrivate - This flag is set to true if the 37 /// "EH_frame" symbol for EH information should be an assembler temporary (aka 38 /// private linkage, aka an L or .L label) or false if it should be a normal 39 /// non-.globl label. This defaults to true. 40 bool IsFunctionEHFrameSymbolPrivate; 41 42 /// SupportsCompactUnwindWithoutEHFrame - True if the target object file 43 /// supports emitting a compact unwind section without an associated EH frame 44 /// section. 45 bool SupportsCompactUnwindWithoutEHFrame; 46 47 /// PersonalityEncoding, LSDAEncoding, FDEEncoding, TTypeEncoding - Some 48 /// encoding values for EH. 49 unsigned PersonalityEncoding; 50 unsigned LSDAEncoding; 51 unsigned FDEEncoding; 52 unsigned FDECFIEncoding; 53 unsigned TTypeEncoding; 54 55 /// Section flags for eh_frame 56 unsigned EHSectionType; 57 unsigned EHSectionFlags; 58 59 /// CompactUnwindDwarfEHFrameOnly - Compact unwind encoding indicating that we 60 /// should emit only an EH frame. 61 unsigned CompactUnwindDwarfEHFrameOnly; 62 63 /// TextSection - Section directive for standard text. 64 /// 65 const MCSection *TextSection; 66 67 /// DataSection - Section directive for standard data. 68 /// 69 const MCSection *DataSection; 70 71 /// BSSSection - Section that is default initialized to zero. 72 const MCSection *BSSSection; 73 74 /// ReadOnlySection - Section that is readonly and can contain arbitrary 75 /// initialized data. Targets are not required to have a readonly section. 76 /// If they don't, various bits of code will fall back to using the data 77 /// section for constants. 78 const MCSection *ReadOnlySection; 79 80 /// StaticCtorSection - This section contains the static constructor pointer 81 /// list. 82 const MCSection *StaticCtorSection; 83 84 /// StaticDtorSection - This section contains the static destructor pointer 85 /// list. 86 const MCSection *StaticDtorSection; 87 88 /// LSDASection - If exception handling is supported by the target, this is 89 /// the section the Language Specific Data Area information is emitted to. 90 const MCSection *LSDASection; 91 92 /// CompactUnwindSection - If exception handling is supported by the target 93 /// and the target can support a compact representation of the CIE and FDE, 94 /// this is the section to emit them into. 95 const MCSection *CompactUnwindSection; 96 97 // Dwarf sections for debug info. If a target supports debug info, these must 98 // be set. 99 const MCSection *DwarfAbbrevSection; 100 const MCSection *DwarfInfoSection; 101 const MCSection *DwarfLineSection; 102 const MCSection *DwarfFrameSection; 103 const MCSection *DwarfPubTypesSection; 104 const MCSection *DwarfDebugInlineSection; 105 const MCSection *DwarfStrSection; 106 const MCSection *DwarfLocSection; 107 const MCSection *DwarfARangesSection; 108 const MCSection *DwarfRangesSection; 109 const MCSection *DwarfMacroInfoSection; 110 // The pubnames section is no longer generated by default. The generation 111 // can be enabled by a compiler flag. 112 const MCSection *DwarfPubNamesSection; 113 114 // DWARF5 Experimental Debug Info Sections 115 /// DwarfAccelNamesSection, DwarfAccelObjCSection, 116 /// DwarfAccelNamespaceSection, DwarfAccelTypesSection - 117 /// If we use the DWARF accelerated hash tables then we want to emit these 118 /// sections. 119 const MCSection *DwarfAccelNamesSection; 120 const MCSection *DwarfAccelObjCSection; 121 const MCSection *DwarfAccelNamespaceSection; 122 const MCSection *DwarfAccelTypesSection; 123 124 /// These are used for the Fission separate debug information files. 125 const MCSection *DwarfInfoDWOSection; 126 const MCSection *DwarfAbbrevDWOSection; 127 const MCSection *DwarfStrDWOSection; 128 const MCSection *DwarfLineDWOSection; 129 const MCSection *DwarfLocDWOSection; 130 const MCSection *DwarfStrOffDWOSection; 131 const MCSection *DwarfAddrSection; 132 133 /// Sections for newer gnu pubnames and pubtypes. 134 const MCSection *DwarfGnuPubNamesSection; 135 const MCSection *DwarfGnuPubTypesSection; 136 137 const MCSection *COFFDebugSymbolsSection; 138 139 // Extra TLS Variable Data section. If the target needs to put additional 140 // information for a TLS variable, it'll go here. 141 const MCSection *TLSExtraDataSection; 142 143 /// TLSDataSection - Section directive for Thread Local data. 144 /// ELF, MachO and COFF. 145 const MCSection *TLSDataSection; // Defaults to ".tdata". 146 147 /// TLSBSSSection - Section directive for Thread Local uninitialized data. 148 /// Null if this target doesn't support a BSS section. 149 /// ELF and MachO only. 150 const MCSection *TLSBSSSection; // Defaults to ".tbss". 151 152 /// StackMap section. 153 const MCSection *StackMapSection; 154 155 /// EHFrameSection - EH frame section. It is initialized on demand so it 156 /// can be overwritten (with uniquing). 157 const MCSection *EHFrameSection; 158 159 /// ELF specific sections. 160 /// 161 const MCSection *DataRelSection; 162 const MCSection *DataRelLocalSection; 163 const MCSection *DataRelROSection; 164 const MCSection *DataRelROLocalSection; 165 const MCSection *MergeableConst4Section; 166 const MCSection *MergeableConst8Section; 167 const MCSection *MergeableConst16Section; 168 169 /// MachO specific sections. 170 /// 171 172 /// TLSTLVSection - Section for thread local structure information. 173 /// Contains the source code name of the variable, visibility and a pointer 174 /// to the initial value (.tdata or .tbss). 175 const MCSection *TLSTLVSection; // Defaults to ".tlv". 176 177 /// TLSThreadInitSection - Section for thread local data initialization 178 /// functions. 179 const MCSection *TLSThreadInitSection; // Defaults to ".thread_init_func". 180 181 const MCSection *CStringSection; 182 const MCSection *UStringSection; 183 const MCSection *TextCoalSection; 184 const MCSection *ConstTextCoalSection; 185 const MCSection *ConstDataSection; 186 const MCSection *DataCoalSection; 187 const MCSection *DataCommonSection; 188 const MCSection *DataBSSSection; 189 const MCSection *FourByteConstantSection; 190 const MCSection *EightByteConstantSection; 191 const MCSection *SixteenByteConstantSection; 192 const MCSection *LazySymbolPointerSection; 193 const MCSection *NonLazySymbolPointerSection; 194 195 /// COFF specific sections. 196 /// 197 const MCSection *DrectveSection; 198 const MCSection *PDataSection; 199 const MCSection *XDataSection; 200 201public: 202 void InitMCObjectFileInfo(StringRef TT, Reloc::Model RM, CodeModel::Model CM, 203 MCContext &ctx); 204 205 bool isFunctionEHFrameSymbolPrivate() const { 206 return IsFunctionEHFrameSymbolPrivate; 207 } 208 bool getSupportsWeakOmittedEHFrame() const { 209 return SupportsWeakOmittedEHFrame; 210 } 211 bool getSupportsCompactUnwindWithoutEHFrame() const { 212 return SupportsCompactUnwindWithoutEHFrame; 213 } 214 bool getCommDirectiveSupportsAlignment() const { 215 return CommDirectiveSupportsAlignment; 216 } 217 218 unsigned getPersonalityEncoding() const { return PersonalityEncoding; } 219 unsigned getLSDAEncoding() const { return LSDAEncoding; } 220 unsigned getFDEEncoding(bool CFI) const { 221 return CFI ? FDECFIEncoding : FDEEncoding; 222 } 223 unsigned getTTypeEncoding() const { return TTypeEncoding; } 224 225 unsigned getCompactUnwindDwarfEHFrameOnly() const { 226 return CompactUnwindDwarfEHFrameOnly; 227 } 228 229 const MCSection *getTextSection() const { return TextSection; } 230 const MCSection *getDataSection() const { return DataSection; } 231 const MCSection *getBSSSection() const { return BSSSection; } 232 const MCSection *getLSDASection() const { return LSDASection; } 233 const MCSection *getCompactUnwindSection() const{ 234 return CompactUnwindSection; 235 } 236 const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; } 237 const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; } 238 const MCSection *getDwarfLineSection() const { return DwarfLineSection; } 239 const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; } 240 const MCSection *getDwarfPubNamesSection() const{return DwarfPubNamesSection;} 241 const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;} 242 const MCSection *getDwarfGnuPubNamesSection() const { 243 return DwarfGnuPubNamesSection; 244 } 245 const MCSection *getDwarfGnuPubTypesSection() const { 246 return DwarfGnuPubTypesSection; 247 } 248 const MCSection *getDwarfDebugInlineSection() const { 249 return DwarfDebugInlineSection; 250 } 251 const MCSection *getDwarfStrSection() const { return DwarfStrSection; } 252 const MCSection *getDwarfLocSection() const { return DwarfLocSection; } 253 const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;} 254 const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; } 255 const MCSection *getDwarfMacroInfoSection() const { 256 return DwarfMacroInfoSection; 257 } 258 259 // DWARF5 Experimental Debug Info Sections 260 const MCSection *getDwarfAccelNamesSection() const { 261 return DwarfAccelNamesSection; 262 } 263 const MCSection *getDwarfAccelObjCSection() const { 264 return DwarfAccelObjCSection; 265 } 266 const MCSection *getDwarfAccelNamespaceSection() const { 267 return DwarfAccelNamespaceSection; 268 } 269 const MCSection *getDwarfAccelTypesSection() const { 270 return DwarfAccelTypesSection; 271 } 272 const MCSection *getDwarfInfoDWOSection() const { 273 return DwarfInfoDWOSection; 274 } 275 const MCSection *getDwarfTypesSection(uint64_t Hash) const; 276 const MCSection *getDwarfTypesDWOSection(uint64_t Hash) const; 277 const MCSection *getDwarfAbbrevDWOSection() const { 278 return DwarfAbbrevDWOSection; 279 } 280 const MCSection *getDwarfStrDWOSection() const { 281 return DwarfStrDWOSection; 282 } 283 const MCSection *getDwarfLineDWOSection() const { 284 return DwarfLineDWOSection; 285 } 286 const MCSection *getDwarfLocDWOSection() const { 287 return DwarfLocDWOSection; 288 } 289 const MCSection *getDwarfStrOffDWOSection() const { 290 return DwarfStrOffDWOSection; 291 } 292 const MCSection *getDwarfAddrSection() const { 293 return DwarfAddrSection; 294 } 295 296 const MCSection *getCOFFDebugSymbolsSection() const { 297 return COFFDebugSymbolsSection; 298 } 299 300 const MCSection *getTLSExtraDataSection() const { 301 return TLSExtraDataSection; 302 } 303 const MCSection *getTLSDataSection() const { return TLSDataSection; } 304 const MCSection *getTLSBSSSection() const { return TLSBSSSection; } 305 306 const MCSection *getStackMapSection() const { return StackMapSection; } 307 308 /// ELF specific sections. 309 /// 310 const MCSection *getDataRelSection() const { return DataRelSection; } 311 const MCSection *getDataRelLocalSection() const { 312 return DataRelLocalSection; 313 } 314 const MCSection *getDataRelROSection() const { return DataRelROSection; } 315 const MCSection *getDataRelROLocalSection() const { 316 return DataRelROLocalSection; 317 } 318 const MCSection *getMergeableConst4Section() const { 319 return MergeableConst4Section; 320 } 321 const MCSection *getMergeableConst8Section() const { 322 return MergeableConst8Section; 323 } 324 const MCSection *getMergeableConst16Section() const { 325 return MergeableConst16Section; 326 } 327 328 /// MachO specific sections. 329 /// 330 const MCSection *getTLSTLVSection() const { return TLSTLVSection; } 331 const MCSection *getTLSThreadInitSection() const { 332 return TLSThreadInitSection; 333 } 334 const MCSection *getCStringSection() const { return CStringSection; } 335 const MCSection *getUStringSection() const { return UStringSection; } 336 const MCSection *getTextCoalSection() const { return TextCoalSection; } 337 const MCSection *getConstTextCoalSection() const { 338 return ConstTextCoalSection; 339 } 340 const MCSection *getConstDataSection() const { return ConstDataSection; } 341 const MCSection *getDataCoalSection() const { return DataCoalSection; } 342 const MCSection *getDataCommonSection() const { return DataCommonSection; } 343 const MCSection *getDataBSSSection() const { return DataBSSSection; } 344 const MCSection *getFourByteConstantSection() const { 345 return FourByteConstantSection; 346 } 347 const MCSection *getEightByteConstantSection() const { 348 return EightByteConstantSection; 349 } 350 const MCSection *getSixteenByteConstantSection() const { 351 return SixteenByteConstantSection; 352 } 353 const MCSection *getLazySymbolPointerSection() const { 354 return LazySymbolPointerSection; 355 } 356 const MCSection *getNonLazySymbolPointerSection() const { 357 return NonLazySymbolPointerSection; 358 } 359 360 /// COFF specific sections. 361 /// 362 const MCSection *getDrectveSection() const { return DrectveSection; } 363 const MCSection *getPDataSection() const { return PDataSection; } 364 const MCSection *getXDataSection() const { return XDataSection; } 365 366 const MCSection *getEHFrameSection() { 367 if (!EHFrameSection) 368 InitEHFrameSection(); 369 return EHFrameSection; 370 } 371 372 enum Environment { IsMachO, IsELF, IsCOFF }; 373 Environment getObjectFileType() const { 374 return Env; 375 } 376 377 Reloc::Model getRelocM() const { 378 return RelocM; 379 } 380 381private: 382 Environment Env; 383 Reloc::Model RelocM; 384 CodeModel::Model CMModel; 385 MCContext *Ctx; 386 387 void InitMachOMCObjectFileInfo(Triple T); 388 void InitELFMCObjectFileInfo(Triple T); 389 void InitCOFFMCObjectFileInfo(Triple T); 390 391 /// InitEHFrameSection - Initialize EHFrameSection on demand. 392 /// 393 void InitEHFrameSection(); 394}; 395 396} // end namespace llvm 397 398#endif 399