src/llvm/include/llvm/MC/MCObjectFileInfo.h

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