MCObjectFileInfo.h revision 263508
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 /// PersonalityEncoding, LSDAEncoding, FDEEncoding, TTypeEncoding - Some 43 /// encoding values for EH. 44 unsigned PersonalityEncoding; 45 unsigned LSDAEncoding; 46 unsigned FDEEncoding; 47 unsigned FDECFIEncoding; 48 unsigned TTypeEncoding; 49 50 /// Section flags for eh_frame 51 unsigned EHSectionType; 52 unsigned EHSectionFlags; 53 54 /// CompactUnwindDwarfEHFrameOnly - Compact unwind encoding indicating that we 55 /// should emit only an EH frame. 56 unsigned CompactUnwindDwarfEHFrameOnly; 57 58 /// TextSection - Section directive for standard text. 59 /// 60 const MCSection *TextSection; 61 62 /// DataSection - Section directive for standard data. 63 /// 64 const MCSection *DataSection; 65 66 /// BSSSection - Section that is default initialized to zero. 67 const MCSection *BSSSection; 68 69 /// ReadOnlySection - Section that is readonly and can contain arbitrary 70 /// initialized data. Targets are not required to have a readonly section. 71 /// If they don't, various bits of code will fall back to using the data 72 /// section for constants. 73 const MCSection *ReadOnlySection; 74 75 /// StaticCtorSection - This section contains the static constructor pointer 76 /// list. 77 const MCSection *StaticCtorSection; 78 79 /// StaticDtorSection - This section contains the static destructor pointer 80 /// list. 81 const MCSection *StaticDtorSection; 82 83 /// LSDASection - If exception handling is supported by the target, this is 84 /// the section the Language Specific Data Area information is emitted to. 85 const MCSection *LSDASection; 86 87 /// CompactUnwindSection - If exception handling is supported by the target 88 /// and the target can support a compact representation of the CIE and FDE, 89 /// this is the section to emit them into. 90 const MCSection *CompactUnwindSection; 91 92 // Dwarf sections for debug info. If a target supports debug info, these must 93 // be set. 94 const MCSection *DwarfAbbrevSection; 95 const MCSection *DwarfInfoSection; 96 const MCSection *DwarfLineSection; 97 const MCSection *DwarfFrameSection; 98 const MCSection *DwarfPubTypesSection; 99 const MCSection *DwarfDebugInlineSection; 100 const MCSection *DwarfStrSection; 101 const MCSection *DwarfLocSection; 102 const MCSection *DwarfARangesSection; 103 const MCSection *DwarfRangesSection; 104 const MCSection *DwarfMacroInfoSection; 105 // The pubnames section is no longer generated by default. The generation 106 // can be enabled by a compiler flag. 107 const MCSection *DwarfPubNamesSection; 108 109 // DWARF5 Experimental Debug Info Sections 110 /// DwarfAccelNamesSection, DwarfAccelObjCSection, 111 /// DwarfAccelNamespaceSection, DwarfAccelTypesSection - 112 /// If we use the DWARF accelerated hash tables then we want to emit these 113 /// sections. 114 const MCSection *DwarfAccelNamesSection; 115 const MCSection *DwarfAccelObjCSection; 116 const MCSection *DwarfAccelNamespaceSection; 117 const MCSection *DwarfAccelTypesSection; 118 119 /// These are used for the Fission separate debug information files. 120 const MCSection *DwarfInfoDWOSection; 121 const MCSection *DwarfAbbrevDWOSection; 122 const MCSection *DwarfStrDWOSection; 123 const MCSection *DwarfLineDWOSection; 124 const MCSection *DwarfLocDWOSection; 125 const MCSection *DwarfStrOffDWOSection; 126 const MCSection *DwarfAddrSection; 127 128 /// Sections for newer gnu pubnames and pubtypes. 129 const MCSection *DwarfGnuPubNamesSection; 130 const MCSection *DwarfGnuPubTypesSection; 131 132 // Extra TLS Variable Data section. If the target needs to put additional 133 // information for a TLS variable, it'll go here. 134 const MCSection *TLSExtraDataSection; 135 136 /// TLSDataSection - Section directive for Thread Local data. 137 /// ELF, MachO and COFF. 138 const MCSection *TLSDataSection; // Defaults to ".tdata". 139 140 /// TLSBSSSection - Section directive for Thread Local uninitialized data. 141 /// Null if this target doesn't support a BSS section. 142 /// ELF and MachO only. 143 const MCSection *TLSBSSSection; // Defaults to ".tbss". 144 145 /// StackMap section. 146 const MCSection *StackMapSection; 147 148 /// EHFrameSection - EH frame section. It is initialized on demand so it 149 /// can be overwritten (with uniquing). 150 const MCSection *EHFrameSection; 151 152 /// ELF specific sections. 153 /// 154 const MCSection *DataRelSection; 155 const MCSection *DataRelLocalSection; 156 const MCSection *DataRelROSection; 157 const MCSection *DataRelROLocalSection; 158 const MCSection *MergeableConst4Section; 159 const MCSection *MergeableConst8Section; 160 const MCSection *MergeableConst16Section; 161 162 /// MachO specific sections. 163 /// 164 165 /// TLSTLVSection - Section for thread local structure information. 166 /// Contains the source code name of the variable, visibility and a pointer 167 /// to the initial value (.tdata or .tbss). 168 const MCSection *TLSTLVSection; // Defaults to ".tlv". 169 170 /// TLSThreadInitSection - Section for thread local data initialization 171 /// functions. 172 const MCSection *TLSThreadInitSection; // Defaults to ".thread_init_func". 173 174 const MCSection *CStringSection; 175 const MCSection *UStringSection; 176 const MCSection *TextCoalSection; 177 const MCSection *ConstTextCoalSection; 178 const MCSection *ConstDataSection; 179 const MCSection *DataCoalSection; 180 const MCSection *DataCommonSection; 181 const MCSection *DataBSSSection; 182 const MCSection *FourByteConstantSection; 183 const MCSection *EightByteConstantSection; 184 const MCSection *SixteenByteConstantSection; 185 const MCSection *LazySymbolPointerSection; 186 const MCSection *NonLazySymbolPointerSection; 187 188 /// COFF specific sections. 189 /// 190 const MCSection *DrectveSection; 191 const MCSection *PDataSection; 192 const MCSection *XDataSection; 193 194public: 195 void InitMCObjectFileInfo(StringRef TT, Reloc::Model RM, CodeModel::Model CM, 196 MCContext &ctx); 197 198 bool isFunctionEHFrameSymbolPrivate() const { 199 return IsFunctionEHFrameSymbolPrivate; 200 } 201 bool getSupportsWeakOmittedEHFrame() const { 202 return SupportsWeakOmittedEHFrame; 203 } 204 bool getCommDirectiveSupportsAlignment() const { 205 return CommDirectiveSupportsAlignment; 206 } 207 208 unsigned getPersonalityEncoding() const { return PersonalityEncoding; } 209 unsigned getLSDAEncoding() const { return LSDAEncoding; } 210 unsigned getFDEEncoding(bool CFI) const { 211 return CFI ? FDECFIEncoding : FDEEncoding; 212 } 213 unsigned getTTypeEncoding() const { return TTypeEncoding; } 214 215 unsigned getCompactUnwindDwarfEHFrameOnly() const { 216 return CompactUnwindDwarfEHFrameOnly; 217 } 218 219 const MCSection *getTextSection() const { return TextSection; } 220 const MCSection *getDataSection() const { return DataSection; } 221 const MCSection *getBSSSection() const { return BSSSection; } 222 const MCSection *getLSDASection() const { return LSDASection; } 223 const MCSection *getCompactUnwindSection() const{ 224 return CompactUnwindSection; 225 } 226 const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; } 227 const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; } 228 const MCSection *getDwarfLineSection() const { return DwarfLineSection; } 229 const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; } 230 const MCSection *getDwarfPubNamesSection() const{return DwarfPubNamesSection;} 231 const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;} 232 const MCSection *getDwarfGnuPubNamesSection() const { 233 return DwarfGnuPubNamesSection; 234 } 235 const MCSection *getDwarfGnuPubTypesSection() const { 236 return DwarfGnuPubTypesSection; 237 } 238 const MCSection *getDwarfDebugInlineSection() const { 239 return DwarfDebugInlineSection; 240 } 241 const MCSection *getDwarfStrSection() const { return DwarfStrSection; } 242 const MCSection *getDwarfLocSection() const { return DwarfLocSection; } 243 const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;} 244 const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; } 245 const MCSection *getDwarfMacroInfoSection() const { 246 return DwarfMacroInfoSection; 247 } 248 249 // DWARF5 Experimental Debug Info Sections 250 const MCSection *getDwarfAccelNamesSection() const { 251 return DwarfAccelNamesSection; 252 } 253 const MCSection *getDwarfAccelObjCSection() const { 254 return DwarfAccelObjCSection; 255 } 256 const MCSection *getDwarfAccelNamespaceSection() const { 257 return DwarfAccelNamespaceSection; 258 } 259 const MCSection *getDwarfAccelTypesSection() const { 260 return DwarfAccelTypesSection; 261 } 262 const MCSection *getDwarfInfoDWOSection() const { 263 return DwarfInfoDWOSection; 264 } 265 const MCSection *getDwarfAbbrevDWOSection() const { 266 return DwarfAbbrevDWOSection; 267 } 268 const MCSection *getDwarfStrDWOSection() const { 269 return DwarfStrDWOSection; 270 } 271 const MCSection *getDwarfLineDWOSection() const { 272 return DwarfLineDWOSection; 273 } 274 const MCSection *getDwarfLocDWOSection() const { 275 return DwarfLocDWOSection; 276 } 277 const MCSection *getDwarfStrOffDWOSection() const { 278 return DwarfStrOffDWOSection; 279 } 280 const MCSection *getDwarfAddrSection() const { 281 return DwarfAddrSection; 282 } 283 284 const MCSection *getTLSExtraDataSection() const { 285 return TLSExtraDataSection; 286 } 287 const MCSection *getTLSDataSection() const { return TLSDataSection; } 288 const MCSection *getTLSBSSSection() const { return TLSBSSSection; } 289 290 const MCSection *getStackMapSection() const { return StackMapSection; } 291 292 /// ELF specific sections. 293 /// 294 const MCSection *getDataRelSection() const { return DataRelSection; } 295 const MCSection *getDataRelLocalSection() const { 296 return DataRelLocalSection; 297 } 298 const MCSection *getDataRelROSection() const { return DataRelROSection; } 299 const MCSection *getDataRelROLocalSection() const { 300 return DataRelROLocalSection; 301 } 302 const MCSection *getMergeableConst4Section() const { 303 return MergeableConst4Section; 304 } 305 const MCSection *getMergeableConst8Section() const { 306 return MergeableConst8Section; 307 } 308 const MCSection *getMergeableConst16Section() const { 309 return MergeableConst16Section; 310 } 311 312 /// MachO specific sections. 313 /// 314 const MCSection *getTLSTLVSection() const { return TLSTLVSection; } 315 const MCSection *getTLSThreadInitSection() const { 316 return TLSThreadInitSection; 317 } 318 const MCSection *getCStringSection() const { return CStringSection; } 319 const MCSection *getUStringSection() const { return UStringSection; } 320 const MCSection *getTextCoalSection() const { return TextCoalSection; } 321 const MCSection *getConstTextCoalSection() const { 322 return ConstTextCoalSection; 323 } 324 const MCSection *getConstDataSection() const { return ConstDataSection; } 325 const MCSection *getDataCoalSection() const { return DataCoalSection; } 326 const MCSection *getDataCommonSection() const { return DataCommonSection; } 327 const MCSection *getDataBSSSection() const { return DataBSSSection; } 328 const MCSection *getFourByteConstantSection() const { 329 return FourByteConstantSection; 330 } 331 const MCSection *getEightByteConstantSection() const { 332 return EightByteConstantSection; 333 } 334 const MCSection *getSixteenByteConstantSection() const { 335 return SixteenByteConstantSection; 336 } 337 const MCSection *getLazySymbolPointerSection() const { 338 return LazySymbolPointerSection; 339 } 340 const MCSection *getNonLazySymbolPointerSection() const { 341 return NonLazySymbolPointerSection; 342 } 343 344 /// COFF specific sections. 345 /// 346 const MCSection *getDrectveSection() const { return DrectveSection; } 347 const MCSection *getPDataSection() const { return PDataSection; } 348 const MCSection *getXDataSection() const { return XDataSection; } 349 350 const MCSection *getEHFrameSection() { 351 if (!EHFrameSection) 352 InitEHFrameSection(); 353 return EHFrameSection; 354 } 355 356private: 357 enum Environment { IsMachO, IsELF, IsCOFF }; 358 Environment Env; 359 Reloc::Model RelocM; 360 CodeModel::Model CMModel; 361 MCContext *Ctx; 362 363 void InitMachOMCObjectFileInfo(Triple T); 364 void InitELFMCObjectFileInfo(Triple T); 365 void InitCOFFMCObjectFileInfo(Triple T); 366 367 /// InitEHFrameSection - Initialize EHFrameSection on demand. 368 /// 369 void InitEHFrameSection(); 370}; 371 372} // end namespace llvm 373 374#endif 375