MCObjectFileInfo.h revision 60230ef987f234df88a166fc7878cf3051bca0a1
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 // Section flags for eh_frame 50 unsigned EHSectionType; 51 unsigned EHSectionFlags; 52 53 /// TextSection - Section directive for standard text. 54 /// 55 const MCSection *TextSection; 56 57 /// DataSection - Section directive for standard data. 58 /// 59 const MCSection *DataSection; 60 61 /// BSSSection - Section that is default initialized to zero. 62 const MCSection *BSSSection; 63 64 /// ReadOnlySection - Section that is readonly and can contain arbitrary 65 /// initialized data. Targets are not required to have a readonly section. 66 /// If they don't, various bits of code will fall back to using the data 67 /// section for constants. 68 const MCSection *ReadOnlySection; 69 70 /// StaticCtorSection - This section contains the static constructor pointer 71 /// list. 72 const MCSection *StaticCtorSection; 73 74 /// StaticDtorSection - This section contains the static destructor pointer 75 /// list. 76 const MCSection *StaticDtorSection; 77 78 /// LSDASection - If exception handling is supported by the target, this is 79 /// the section the Language Specific Data Area information is emitted to. 80 const MCSection *LSDASection; 81 82 /// CompactUnwindSection - If exception handling is supported by the target 83 /// and the target can support a compact representation of the CIE and FDE, 84 /// this is the section to emit them into. 85 const MCSection *CompactUnwindSection; 86 87 // Dwarf sections for debug info. If a target supports debug info, these must 88 // be set. 89 const MCSection *DwarfAbbrevSection; 90 const MCSection *DwarfInfoSection; 91 const MCSection *DwarfLineSection; 92 const MCSection *DwarfFrameSection; 93 const MCSection *DwarfPubTypesSection; 94 const MCSection *DwarfDebugInlineSection; 95 const MCSection *DwarfStrSection; 96 const MCSection *DwarfLocSection; 97 const MCSection *DwarfARangesSection; 98 const MCSection *DwarfRangesSection; 99 const MCSection *DwarfMacroInfoSection; 100 101 // DWARF5 Experimental Debug Info Sections 102 /// DwarfAccelNamesSection, DwarfAccelObjCSection, 103 /// DwarfAccelNamespaceSection, DwarfAccelTypesSection - 104 /// If we use the DWARF accelerated hash tables then we want to emit these 105 /// sections. 106 const MCSection *DwarfAccelNamesSection; 107 const MCSection *DwarfAccelObjCSection; 108 const MCSection *DwarfAccelNamespaceSection; 109 const MCSection *DwarfAccelTypesSection; 110 111 /// These are used for the Fission separate debug information files. 112 const MCSection *DwarfInfoDWOSection; 113 const MCSection *DwarfAbbrevDWOSection; 114 const MCSection *DwarfStrDWOSection; 115 const MCSection *DwarfLineDWOSection; 116 const MCSection *DwarfLocDWOSection; 117 const MCSection *DwarfStrOffDWOSection; 118 119 // Extra TLS Variable Data section. If the target needs to put additional 120 // information for a TLS variable, it'll go here. 121 const MCSection *TLSExtraDataSection; 122 123 /// TLSDataSection - Section directive for Thread Local data. 124 /// ELF, MachO and COFF. 125 const MCSection *TLSDataSection; // Defaults to ".tdata". 126 127 /// TLSBSSSection - Section directive for Thread Local uninitialized data. 128 /// Null if this target doesn't support a BSS section. 129 /// ELF and MachO only. 130 const MCSection *TLSBSSSection; // Defaults to ".tbss". 131 132 133 /// EHFrameSection - EH frame section. It is initialized on demand so it 134 /// can be overwritten (with uniquing). 135 const MCSection *EHFrameSection; 136 137 /// ELF specific sections. 138 /// 139 const MCSection *DataRelSection; 140 const MCSection *DataRelLocalSection; 141 const MCSection *DataRelROSection; 142 const MCSection *DataRelROLocalSection; 143 const MCSection *MergeableConst4Section; 144 const MCSection *MergeableConst8Section; 145 const MCSection *MergeableConst16Section; 146 147 /// MachO specific sections. 148 /// 149 150 /// TLSTLVSection - Section for thread local structure information. 151 /// Contains the source code name of the variable, visibility and a pointer 152 /// to the initial value (.tdata or .tbss). 153 const MCSection *TLSTLVSection; // Defaults to ".tlv". 154 155 /// TLSThreadInitSection - Section for thread local data initialization 156 /// functions. 157 const MCSection *TLSThreadInitSection; // Defaults to ".thread_init_func". 158 159 const MCSection *CStringSection; 160 const MCSection *UStringSection; 161 const MCSection *TextCoalSection; 162 const MCSection *ConstTextCoalSection; 163 const MCSection *ConstDataSection; 164 const MCSection *DataCoalSection; 165 const MCSection *DataCommonSection; 166 const MCSection *DataBSSSection; 167 const MCSection *FourByteConstantSection; 168 const MCSection *EightByteConstantSection; 169 const MCSection *SixteenByteConstantSection; 170 const MCSection *LazySymbolPointerSection; 171 const MCSection *NonLazySymbolPointerSection; 172 173 /// COFF specific sections. 174 /// 175 const MCSection *DrectveSection; 176 const MCSection *PDataSection; 177 const MCSection *XDataSection; 178 179public: 180 void InitMCObjectFileInfo(StringRef TT, Reloc::Model RM, CodeModel::Model CM, 181 MCContext &ctx); 182 183 bool isFunctionEHFrameSymbolPrivate() const { 184 return IsFunctionEHFrameSymbolPrivate; 185 } 186 bool getSupportsWeakOmittedEHFrame() const { 187 return SupportsWeakOmittedEHFrame; 188 } 189 bool getCommDirectiveSupportsAlignment() const { 190 return CommDirectiveSupportsAlignment; 191 } 192 193 unsigned getPersonalityEncoding() const { return PersonalityEncoding; } 194 unsigned getLSDAEncoding() const { return LSDAEncoding; } 195 unsigned getFDEEncoding(bool CFI) const { 196 return CFI ? FDECFIEncoding : FDEEncoding; 197 } 198 unsigned getTTypeEncoding() const { return TTypeEncoding; } 199 200 const MCSection *getTextSection() const { return TextSection; } 201 const MCSection *getDataSection() const { return DataSection; } 202 const MCSection *getBSSSection() const { return BSSSection; } 203 const MCSection *getLSDASection() const { return LSDASection; } 204 const MCSection *getCompactUnwindSection() const{ 205 return CompactUnwindSection; 206 } 207 const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; } 208 const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; } 209 const MCSection *getDwarfLineSection() const { return DwarfLineSection; } 210 const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; } 211 const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;} 212 const MCSection *getDwarfDebugInlineSection() const { 213 return DwarfDebugInlineSection; 214 } 215 const MCSection *getDwarfStrSection() const { return DwarfStrSection; } 216 const MCSection *getDwarfLocSection() const { return DwarfLocSection; } 217 const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;} 218 const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; } 219 const MCSection *getDwarfMacroInfoSection() const { 220 return DwarfMacroInfoSection; 221 } 222 223 // DWARF5 Experimental Debug Info Sections 224 const MCSection *getDwarfAccelNamesSection() const { 225 return DwarfAccelNamesSection; 226 } 227 const MCSection *getDwarfAccelObjCSection() const { 228 return DwarfAccelObjCSection; 229 } 230 const MCSection *getDwarfAccelNamespaceSection() const { 231 return DwarfAccelNamespaceSection; 232 } 233 const MCSection *getDwarfAccelTypesSection() const { 234 return DwarfAccelTypesSection; 235 } 236 const MCSection *getDwarfInfoDWOSection() const { 237 return DwarfInfoDWOSection; 238 } 239 const MCSection *getDwarfAbbrevDWOSection() const { 240 return DwarfAbbrevDWOSection; 241 } 242 const MCSection *getDwarfStrDWOSection() const { 243 return DwarfStrDWOSection; 244 } 245 const MCSection *getDwarfLineDWOSection() const { 246 return DwarfLineDWOSection; 247 } 248 const MCSection *getDwarfLocDWOSection() const { 249 return DwarfLocDWOSection; 250 } 251 const MCSection *getDwarfStrOffDWOSection() const { 252 return DwarfStrOffDWOSection; 253 } 254 255 const MCSection *getTLSExtraDataSection() const { 256 return TLSExtraDataSection; 257 } 258 const MCSection *getTLSDataSection() const { return TLSDataSection; } 259 const MCSection *getTLSBSSSection() const { return TLSBSSSection; } 260 261 /// ELF specific sections. 262 /// 263 const MCSection *getDataRelSection() const { return DataRelSection; } 264 const MCSection *getDataRelLocalSection() const { 265 return DataRelLocalSection; 266 } 267 const MCSection *getDataRelROSection() const { return DataRelROSection; } 268 const MCSection *getDataRelROLocalSection() const { 269 return DataRelROLocalSection; 270 } 271 const MCSection *getMergeableConst4Section() const { 272 return MergeableConst4Section; 273 } 274 const MCSection *getMergeableConst8Section() const { 275 return MergeableConst8Section; 276 } 277 const MCSection *getMergeableConst16Section() const { 278 return MergeableConst16Section; 279 } 280 281 /// MachO specific sections. 282 /// 283 const MCSection *getTLSTLVSection() const { return TLSTLVSection; } 284 const MCSection *getTLSThreadInitSection() const { 285 return TLSThreadInitSection; 286 } 287 const MCSection *getCStringSection() const { return CStringSection; } 288 const MCSection *getUStringSection() const { return UStringSection; } 289 const MCSection *getTextCoalSection() const { return TextCoalSection; } 290 const MCSection *getConstTextCoalSection() const { 291 return ConstTextCoalSection; 292 } 293 const MCSection *getConstDataSection() const { return ConstDataSection; } 294 const MCSection *getDataCoalSection() const { return DataCoalSection; } 295 const MCSection *getDataCommonSection() const { return DataCommonSection; } 296 const MCSection *getDataBSSSection() const { return DataBSSSection; } 297 const MCSection *getFourByteConstantSection() const { 298 return FourByteConstantSection; 299 } 300 const MCSection *getEightByteConstantSection() const { 301 return EightByteConstantSection; 302 } 303 const MCSection *getSixteenByteConstantSection() const { 304 return SixteenByteConstantSection; 305 } 306 const MCSection *getLazySymbolPointerSection() const { 307 return LazySymbolPointerSection; 308 } 309 const MCSection *getNonLazySymbolPointerSection() const { 310 return NonLazySymbolPointerSection; 311 } 312 313 /// COFF specific sections. 314 /// 315 const MCSection *getDrectveSection() const { return DrectveSection; } 316 const MCSection *getPDataSection() const { return PDataSection; } 317 const MCSection *getXDataSection() const { return XDataSection; } 318 319 const MCSection *getEHFrameSection() { 320 if (!EHFrameSection) 321 InitEHFrameSection(); 322 return EHFrameSection; 323 } 324 325private: 326 enum Environment { IsMachO, IsELF, IsCOFF }; 327 Environment Env; 328 Reloc::Model RelocM; 329 CodeModel::Model CMModel; 330 MCContext *Ctx; 331 332 void InitMachOMCObjectFileInfo(Triple T); 333 void InitELFMCObjectFileInfo(Triple T); 334 void InitCOFFMCObjectFileInfo(Triple T); 335 336 /// InitEHFrameSection - Initialize EHFrameSection on demand. 337 /// 338 void InitEHFrameSection(); 339}; 340 341} // end namespace llvm 342 343#endif 344