MCObjectFileInfo.h revision 915e46fd967f9a51e128f80d762afd03463a897e
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 // Extra TLS Variable Data section. If the target needs to put additional 112 // information for a TLS variable, it'll go here. 113 const MCSection *TLSExtraDataSection; 114 115 /// TLSDataSection - Section directive for Thread Local data. 116 /// ELF, MachO and COFF. 117 const MCSection *TLSDataSection; // Defaults to ".tdata". 118 119 /// TLSBSSSection - Section directive for Thread Local uninitialized data. 120 /// Null if this target doesn't support a BSS section. 121 /// ELF and MachO only. 122 const MCSection *TLSBSSSection; // Defaults to ".tbss". 123 124 125 /// EHFrameSection - EH frame section. It is initialized on demand so it 126 /// can be overwritten (with uniquing). 127 const MCSection *EHFrameSection; 128 129 /// ELF specific sections. 130 /// 131 const MCSection *DataRelSection; 132 const MCSection *DataRelLocalSection; 133 const MCSection *DataRelROSection; 134 const MCSection *DataRelROLocalSection; 135 const MCSection *MergeableConst4Section; 136 const MCSection *MergeableConst8Section; 137 const MCSection *MergeableConst16Section; 138 139 /// MachO specific sections. 140 /// 141 142 /// TLSTLVSection - Section for thread local structure information. 143 /// Contains the source code name of the variable, visibility and a pointer 144 /// to the initial value (.tdata or .tbss). 145 const MCSection *TLSTLVSection; // Defaults to ".tlv". 146 147 /// TLSThreadInitSection - Section for thread local data initialization 148 /// functions. 149 const MCSection *TLSThreadInitSection; // Defaults to ".thread_init_func". 150 151 const MCSection *CStringSection; 152 const MCSection *UStringSection; 153 const MCSection *TextCoalSection; 154 const MCSection *ConstTextCoalSection; 155 const MCSection *ConstDataSection; 156 const MCSection *DataCoalSection; 157 const MCSection *DataCommonSection; 158 const MCSection *DataBSSSection; 159 const MCSection *FourByteConstantSection; 160 const MCSection *EightByteConstantSection; 161 const MCSection *SixteenByteConstantSection; 162 const MCSection *LazySymbolPointerSection; 163 const MCSection *NonLazySymbolPointerSection; 164 165 /// COFF specific sections. 166 /// 167 const MCSection *DrectveSection; 168 const MCSection *PDataSection; 169 const MCSection *XDataSection; 170 171public: 172 void InitMCObjectFileInfo(StringRef TT, Reloc::Model RM, CodeModel::Model CM, 173 MCContext &ctx); 174 175 bool isFunctionEHFrameSymbolPrivate() const { 176 return IsFunctionEHFrameSymbolPrivate; 177 } 178 bool getSupportsWeakOmittedEHFrame() const { 179 return SupportsWeakOmittedEHFrame; 180 } 181 bool getCommDirectiveSupportsAlignment() const { 182 return CommDirectiveSupportsAlignment; 183 } 184 185 unsigned getPersonalityEncoding() const { return PersonalityEncoding; } 186 unsigned getLSDAEncoding() const { return LSDAEncoding; } 187 unsigned getFDEEncoding(bool CFI) const { 188 return CFI ? FDECFIEncoding : FDEEncoding; 189 } 190 unsigned getTTypeEncoding() const { return TTypeEncoding; } 191 192 const MCSection *getTextSection() const { return TextSection; } 193 const MCSection *getDataSection() const { return DataSection; } 194 const MCSection *getBSSSection() const { return BSSSection; } 195 const MCSection *getLSDASection() const { return LSDASection; } 196 const MCSection *getCompactUnwindSection() const{ 197 return CompactUnwindSection; 198 } 199 const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; } 200 const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; } 201 const MCSection *getDwarfLineSection() const { return DwarfLineSection; } 202 const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; } 203 const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;} 204 const MCSection *getDwarfDebugInlineSection() const { 205 return DwarfDebugInlineSection; 206 } 207 const MCSection *getDwarfStrSection() const { return DwarfStrSection; } 208 const MCSection *getDwarfLocSection() const { return DwarfLocSection; } 209 const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;} 210 const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; } 211 const MCSection *getDwarfMacroInfoSection() const { 212 return DwarfMacroInfoSection; 213 } 214 215 // DWARF5 Experimental Debug Info Sections 216 const MCSection *getDwarfAccelNamesSection() const { 217 return DwarfAccelNamesSection; 218 } 219 const MCSection *getDwarfAccelObjCSection() const { 220 return DwarfAccelObjCSection; 221 } 222 const MCSection *getDwarfAccelNamespaceSection() const { 223 return DwarfAccelNamespaceSection; 224 } 225 const MCSection *getDwarfAccelTypesSection() const { 226 return DwarfAccelTypesSection; 227 } 228 229 const MCSection *getTLSExtraDataSection() const { 230 return TLSExtraDataSection; 231 } 232 const MCSection *getTLSDataSection() const { return TLSDataSection; } 233 const MCSection *getTLSBSSSection() const { return TLSBSSSection; } 234 235 /// ELF specific sections. 236 /// 237 const MCSection *getDataRelSection() const { return DataRelSection; } 238 const MCSection *getDataRelLocalSection() const { 239 return DataRelLocalSection; 240 } 241 const MCSection *getDataRelROSection() const { return DataRelROSection; } 242 const MCSection *getDataRelROLocalSection() const { 243 return DataRelROLocalSection; 244 } 245 const MCSection *getMergeableConst4Section() const { 246 return MergeableConst4Section; 247 } 248 const MCSection *getMergeableConst8Section() const { 249 return MergeableConst8Section; 250 } 251 const MCSection *getMergeableConst16Section() const { 252 return MergeableConst16Section; 253 } 254 255 /// MachO specific sections. 256 /// 257 const MCSection *getTLSTLVSection() const { return TLSTLVSection; } 258 const MCSection *getTLSThreadInitSection() const { 259 return TLSThreadInitSection; 260 } 261 const MCSection *getCStringSection() const { return CStringSection; } 262 const MCSection *getUStringSection() const { return UStringSection; } 263 const MCSection *getTextCoalSection() const { return TextCoalSection; } 264 const MCSection *getConstTextCoalSection() const { 265 return ConstTextCoalSection; 266 } 267 const MCSection *getConstDataSection() const { return ConstDataSection; } 268 const MCSection *getDataCoalSection() const { return DataCoalSection; } 269 const MCSection *getDataCommonSection() const { return DataCommonSection; } 270 const MCSection *getDataBSSSection() const { return DataBSSSection; } 271 const MCSection *getFourByteConstantSection() const { 272 return FourByteConstantSection; 273 } 274 const MCSection *getEightByteConstantSection() const { 275 return EightByteConstantSection; 276 } 277 const MCSection *getSixteenByteConstantSection() const { 278 return SixteenByteConstantSection; 279 } 280 const MCSection *getLazySymbolPointerSection() const { 281 return LazySymbolPointerSection; 282 } 283 const MCSection *getNonLazySymbolPointerSection() const { 284 return NonLazySymbolPointerSection; 285 } 286 287 /// COFF specific sections. 288 /// 289 const MCSection *getDrectveSection() const { return DrectveSection; } 290 const MCSection *getPDataSection() const { return PDataSection; } 291 const MCSection *getXDataSection() const { return XDataSection; } 292 293 const MCSection *getEHFrameSection() { 294 if (!EHFrameSection) 295 InitEHFrameSection(); 296 return EHFrameSection; 297 } 298 299private: 300 enum Environment { IsMachO, IsELF, IsCOFF }; 301 Environment Env; 302 Reloc::Model RelocM; 303 CodeModel::Model CMModel; 304 MCContext *Ctx; 305 306 void InitMachOMCObjectFileInfo(Triple T); 307 void InitELFMCObjectFileInfo(Triple T); 308 void InitCOFFMCObjectFileInfo(Triple T); 309 310 /// InitEHFrameSection - Initialize EHFrameSection on demand. 311 /// 312 void InitEHFrameSection(); 313}; 314 315} // end namespace llvm 316 317#endif 318