MCObjectFileInfo.h revision 43e1d7aded7bf8486f5b810b6dc85652f99f6ba0
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 /// DwarfAccelNamesSection, DwarfAccelObjCSection, 88 /// DwarfAccelNamespaceSection, DwarfAccelTypesSection - 89 /// If we use the DWARF accelerated hash tables then we want toe emit these 90 /// sections. 91 const MCSection *DwarfAccelNamesSection; 92 const MCSection *DwarfAccelObjCSection; 93 const MCSection *DwarfAccelNamespaceSection; 94 const MCSection *DwarfAccelTypesSection; 95 96 // Dwarf sections for debug info. If a target supports debug info, these must 97 // be set. 98 const MCSection *DwarfAbbrevSection; 99 const MCSection *DwarfInfoSection; 100 const MCSection *DwarfLineSection; 101 const MCSection *DwarfFrameSection; 102 const MCSection *DwarfPubTypesSection; 103 const MCSection *DwarfDebugInlineSection; 104 const MCSection *DwarfStrSection; 105 const MCSection *DwarfLocSection; 106 const MCSection *DwarfARangesSection; 107 const MCSection *DwarfRangesSection; 108 const MCSection *DwarfMacroInfoSection; 109 110 // Extra TLS Variable Data section. If the target needs to put additional 111 // information for a TLS variable, it'll go here. 112 const MCSection *TLSExtraDataSection; 113 114 /// TLSDataSection - Section directive for Thread Local data. 115 /// ELF, MachO and COFF. 116 const MCSection *TLSDataSection; // Defaults to ".tdata". 117 118 /// TLSBSSSection - Section directive for Thread Local uninitialized data. 119 /// Null if this target doesn't support a BSS section. 120 /// ELF and MachO only. 121 const MCSection *TLSBSSSection; // Defaults to ".tbss". 122 123 124 /// EHFrameSection - EH frame section. It is initialized on demand so it 125 /// can be overwritten (with uniquing). 126 const MCSection *EHFrameSection; 127 128 /// ELF specific sections. 129 /// 130 const MCSection *DataRelSection; 131 const MCSection *DataRelLocalSection; 132 const MCSection *DataRelROSection; 133 const MCSection *DataRelROLocalSection; 134 const MCSection *MergeableConst4Section; 135 const MCSection *MergeableConst8Section; 136 const MCSection *MergeableConst16Section; 137 138 /// MachO specific sections. 139 /// 140 141 /// TLSTLVSection - Section for thread local structure information. 142 /// Contains the source code name of the variable, visibility and a pointer 143 /// to the initial value (.tdata or .tbss). 144 const MCSection *TLSTLVSection; // Defaults to ".tlv". 145 146 /// TLSThreadInitSection - Section for thread local data initialization 147 /// functions. 148 const MCSection *TLSThreadInitSection; // Defaults to ".thread_init_func". 149 150 const MCSection *CStringSection; 151 const MCSection *UStringSection; 152 const MCSection *TextCoalSection; 153 const MCSection *ConstTextCoalSection; 154 const MCSection *ConstDataSection; 155 const MCSection *DataCoalSection; 156 const MCSection *DataCommonSection; 157 const MCSection *DataBSSSection; 158 const MCSection *FourByteConstantSection; 159 const MCSection *EightByteConstantSection; 160 const MCSection *SixteenByteConstantSection; 161 const MCSection *LazySymbolPointerSection; 162 const MCSection *NonLazySymbolPointerSection; 163 164 /// COFF specific sections. 165 /// 166 const MCSection *DrectveSection; 167 const MCSection *PDataSection; 168 const MCSection *XDataSection; 169 170public: 171 void InitMCObjectFileInfo(StringRef TT, Reloc::Model RM, CodeModel::Model CM, 172 MCContext &ctx); 173 174 bool isFunctionEHFrameSymbolPrivate() const { 175 return IsFunctionEHFrameSymbolPrivate; 176 } 177 bool getSupportsWeakOmittedEHFrame() const { 178 return SupportsWeakOmittedEHFrame; 179 } 180 bool getCommDirectiveSupportsAlignment() const { 181 return CommDirectiveSupportsAlignment; 182 } 183 184 unsigned getPersonalityEncoding() const { return PersonalityEncoding; } 185 unsigned getLSDAEncoding() const { return LSDAEncoding; } 186 unsigned getFDEEncoding(bool CFI) const { 187 return CFI ? FDECFIEncoding : FDEEncoding; 188 } 189 unsigned getTTypeEncoding() const { return TTypeEncoding; } 190 191 const MCSection *getTextSection() const { return TextSection; } 192 const MCSection *getDataSection() const { return DataSection; } 193 const MCSection *getBSSSection() const { return BSSSection; } 194 const MCSection *getLSDASection() const { return LSDASection; } 195 const MCSection *getCompactUnwindSection() const{ 196 return CompactUnwindSection; 197 } 198 const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; } 199 const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; } 200 const MCSection *getDwarfLineSection() const { return DwarfLineSection; } 201 const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; } 202 const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;} 203 const MCSection *getDwarfDebugInlineSection() const { 204 return DwarfDebugInlineSection; 205 } 206 const MCSection *getDwarfStrSection() const { return DwarfStrSection; } 207 const MCSection *getDwarfLocSection() const { return DwarfLocSection; } 208 const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;} 209 const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; } 210 const MCSection *getDwarfMacroInfoSection() const { 211 return DwarfMacroInfoSection; 212 } 213 214 // DWARF5 Experimental Debug Info Sections 215 const MCSection *getDwarfAccelNamesSection() const { 216 return DwarfAccelNamesSection; 217 } 218 const MCSection *getDwarfAccelObjCSection() const { 219 return DwarfAccelObjCSection; 220 } 221 const MCSection *getDwarfAccelNamespaceSection() const { 222 return DwarfAccelNamespaceSection; 223 } 224 const MCSection *getDwarfAccelTypesSection() const { 225 return DwarfAccelTypesSection; 226 } 227 228 const MCSection *getTLSExtraDataSection() const { 229 return TLSExtraDataSection; 230 } 231 const MCSection *getTLSDataSection() const { return TLSDataSection; } 232 const MCSection *getTLSBSSSection() const { return TLSBSSSection; } 233 234 /// ELF specific sections. 235 /// 236 const MCSection *getDataRelSection() const { return DataRelSection; } 237 const MCSection *getDataRelLocalSection() const { 238 return DataRelLocalSection; 239 } 240 const MCSection *getDataRelROSection() const { return DataRelROSection; } 241 const MCSection *getDataRelROLocalSection() const { 242 return DataRelROLocalSection; 243 } 244 const MCSection *getMergeableConst4Section() const { 245 return MergeableConst4Section; 246 } 247 const MCSection *getMergeableConst8Section() const { 248 return MergeableConst8Section; 249 } 250 const MCSection *getMergeableConst16Section() const { 251 return MergeableConst16Section; 252 } 253 254 /// MachO specific sections. 255 /// 256 const MCSection *getTLSTLVSection() const { return TLSTLVSection; } 257 const MCSection *getTLSThreadInitSection() const { 258 return TLSThreadInitSection; 259 } 260 const MCSection *getCStringSection() const { return CStringSection; } 261 const MCSection *getUStringSection() const { return UStringSection; } 262 const MCSection *getTextCoalSection() const { return TextCoalSection; } 263 const MCSection *getConstTextCoalSection() const { 264 return ConstTextCoalSection; 265 } 266 const MCSection *getConstDataSection() const { return ConstDataSection; } 267 const MCSection *getDataCoalSection() const { return DataCoalSection; } 268 const MCSection *getDataCommonSection() const { return DataCommonSection; } 269 const MCSection *getDataBSSSection() const { return DataBSSSection; } 270 const MCSection *getFourByteConstantSection() const { 271 return FourByteConstantSection; 272 } 273 const MCSection *getEightByteConstantSection() const { 274 return EightByteConstantSection; 275 } 276 const MCSection *getSixteenByteConstantSection() const { 277 return SixteenByteConstantSection; 278 } 279 const MCSection *getLazySymbolPointerSection() const { 280 return LazySymbolPointerSection; 281 } 282 const MCSection *getNonLazySymbolPointerSection() const { 283 return NonLazySymbolPointerSection; 284 } 285 286 /// COFF specific sections. 287 /// 288 const MCSection *getDrectveSection() const { return DrectveSection; } 289 const MCSection *getPDataSection() const { return PDataSection; } 290 const MCSection *getXDataSection() const { return XDataSection; } 291 292 const MCSection *getEHFrameSection() { 293 if (!EHFrameSection) 294 InitEHFrameSection(); 295 return EHFrameSection; 296 } 297 298private: 299 enum Environment { IsMachO, IsELF, IsCOFF }; 300 Environment Env; 301 Reloc::Model RelocM; 302 CodeModel::Model CMModel; 303 MCContext *Ctx; 304 305 void InitMachOMCObjectFileInfo(Triple T); 306 void InitELFMCObjectFileInfo(Triple T); 307 void InitCOFFMCObjectFileInfo(Triple T); 308 309 /// InitEHFrameSection - Initialize EHFrameSection on demand. 310 /// 311 void InitEHFrameSection(); 312}; 313 314} // end namespace llvm 315 316#endif 317