1 //===-- llvm/MC/MCObjectFileInfo.h - Object File Info -----------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file describes common object file formats. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_MC_MCOBJECTFILEINFO_H 14 #define LLVM_MC_MCOBJECTFILEINFO_H 15 16 #include "llvm/ADT/DenseMap.h" 17 #include "llvm/ADT/Triple.h" 18 #include "llvm/BinaryFormat/Swift.h" 19 #include "llvm/MC/MCSymbol.h" 20 #include "llvm/Support/CodeGen.h" 21 #include "llvm/Support/VersionTuple.h" 22 23 namespace llvm { 24 class MCContext; 25 class MCSection; 26 27 class MCObjectFileInfo { 28 protected: 29 /// True if .comm supports alignment. This is a hack for as long as we 30 /// support 10.4 Tiger, whose assembler doesn't support alignment on comm. 31 bool CommDirectiveSupportsAlignment = false; 32 33 /// True if target object file supports a weak_definition of constant 0 for an 34 /// omitted EH frame. 35 bool SupportsWeakOmittedEHFrame = false; 36 37 /// True if the target object file supports emitting a compact unwind section 38 /// without an associated EH frame section. 39 bool SupportsCompactUnwindWithoutEHFrame = false; 40 41 /// OmitDwarfIfHaveCompactUnwind - True if the target object file 42 /// supports having some functions with compact unwind and other with 43 /// dwarf unwind. 44 bool OmitDwarfIfHaveCompactUnwind = false; 45 46 /// FDE CFI encoding. Controls the encoding of the begin label in the 47 /// .eh_frame section. Unlike the LSDA encoding, personality encoding, and 48 /// type encodings, this is something that the assembler just "knows" about 49 /// its target 50 unsigned FDECFIEncoding = 0; 51 52 /// Compact unwind encoding indicating that we should emit only an EH frame. 53 unsigned CompactUnwindDwarfEHFrameOnly = 0; 54 55 /// Section directive for standard text. 56 MCSection *TextSection = nullptr; 57 58 /// Section directive for standard data. 59 MCSection *DataSection = nullptr; 60 61 /// Section that is default initialized to zero. 62 MCSection *BSSSection = nullptr; 63 64 /// Section that is readonly and can contain arbitrary initialized data. 65 /// Targets are not required to have a readonly section. If they don't, 66 /// various bits of code will fall back to using the data section for 67 /// constants. 68 MCSection *ReadOnlySection = nullptr; 69 70 /// If exception handling is supported by the target, this is the section the 71 /// Language Specific Data Area information is emitted to. 72 MCSection *LSDASection = nullptr; 73 74 /// If exception handling is supported by the target and the target can 75 /// support a compact representation of the CIE and FDE, this is the section 76 /// to emit them into. 77 MCSection *CompactUnwindSection = nullptr; 78 79 // Dwarf sections for debug info. If a target supports debug info, these must 80 // be set. 81 MCSection *DwarfAbbrevSection = nullptr; 82 MCSection *DwarfInfoSection = nullptr; 83 MCSection *DwarfLineSection = nullptr; 84 MCSection *DwarfLineStrSection = nullptr; 85 MCSection *DwarfFrameSection = nullptr; 86 MCSection *DwarfPubTypesSection = nullptr; 87 const MCSection *DwarfDebugInlineSection = nullptr; 88 MCSection *DwarfStrSection = nullptr; 89 MCSection *DwarfLocSection = nullptr; 90 MCSection *DwarfARangesSection = nullptr; 91 MCSection *DwarfRangesSection = nullptr; 92 MCSection *DwarfMacinfoSection = nullptr; 93 MCSection *DwarfMacroSection = nullptr; 94 // The pubnames section is no longer generated by default. The generation 95 // can be enabled by a compiler flag. 96 MCSection *DwarfPubNamesSection = nullptr; 97 98 /// Accelerator table sections. DwarfDebugNamesSection is the DWARF v5 99 /// accelerator table, while DwarfAccelNamesSection, DwarfAccelObjCSection, 100 /// DwarfAccelNamespaceSection, DwarfAccelTypesSection are pre-DWARF v5 101 /// extensions. 102 MCSection *DwarfDebugNamesSection = nullptr; 103 MCSection *DwarfAccelNamesSection = nullptr; 104 MCSection *DwarfAccelObjCSection = nullptr; 105 MCSection *DwarfAccelNamespaceSection = nullptr; 106 MCSection *DwarfAccelTypesSection = nullptr; 107 108 // These are used for the Fission separate debug information files. 109 MCSection *DwarfInfoDWOSection = nullptr; 110 MCSection *DwarfTypesDWOSection = nullptr; 111 MCSection *DwarfAbbrevDWOSection = nullptr; 112 MCSection *DwarfStrDWOSection = nullptr; 113 MCSection *DwarfLineDWOSection = nullptr; 114 MCSection *DwarfLocDWOSection = nullptr; 115 MCSection *DwarfStrOffDWOSection = nullptr; 116 MCSection *DwarfMacinfoDWOSection = nullptr; 117 MCSection *DwarfMacroDWOSection = nullptr; 118 119 /// The DWARF v5 string offset and address table sections. 120 MCSection *DwarfStrOffSection = nullptr; 121 MCSection *DwarfAddrSection = nullptr; 122 /// The DWARF v5 range list section. 123 MCSection *DwarfRnglistsSection = nullptr; 124 /// The DWARF v5 locations list section. 125 MCSection *DwarfLoclistsSection = nullptr; 126 127 /// The DWARF v5 range and location list sections for fission. 128 MCSection *DwarfRnglistsDWOSection = nullptr; 129 MCSection *DwarfLoclistsDWOSection = nullptr; 130 131 // These are for Fission DWP files. 132 MCSection *DwarfCUIndexSection = nullptr; 133 MCSection *DwarfTUIndexSection = nullptr; 134 135 /// Section for newer gnu pubnames. 136 MCSection *DwarfGnuPubNamesSection = nullptr; 137 /// Section for newer gnu pubtypes. 138 MCSection *DwarfGnuPubTypesSection = nullptr; 139 140 // Section for Swift AST 141 MCSection *DwarfSwiftASTSection = nullptr; 142 143 MCSection *COFFDebugSymbolsSection = nullptr; 144 MCSection *COFFDebugTypesSection = nullptr; 145 MCSection *COFFGlobalTypeHashesSection = nullptr; 146 147 /// Extra TLS Variable Data section. 148 /// 149 /// If the target needs to put additional information for a TLS variable, 150 /// it'll go here. 151 MCSection *TLSExtraDataSection = nullptr; 152 153 /// Section directive for Thread Local data. ELF, MachO, COFF, and Wasm. 154 MCSection *TLSDataSection = nullptr; // Defaults to ".tdata". 155 156 /// Section directive for Thread Local uninitialized data. 157 /// 158 /// Null if this target doesn't support a BSS section. ELF and MachO only. 159 MCSection *TLSBSSSection = nullptr; // Defaults to ".tbss". 160 161 /// StackMap section. 162 MCSection *StackMapSection = nullptr; 163 164 /// FaultMap section. 165 MCSection *FaultMapSection = nullptr; 166 167 /// Remarks section. 168 MCSection *RemarksSection = nullptr; 169 170 /// EH frame section. 171 /// 172 /// It is initialized on demand so it can be overwritten (with uniquing). 173 MCSection *EHFrameSection = nullptr; 174 175 /// Section containing metadata on function stack sizes. 176 MCSection *StackSizesSection = nullptr; 177 178 /// Section for pseudo probe information used by AutoFDO 179 MCSection *PseudoProbeSection = nullptr; 180 MCSection *PseudoProbeDescSection = nullptr; 181 182 // ELF specific sections. 183 MCSection *DataRelROSection = nullptr; 184 MCSection *MergeableConst4Section = nullptr; 185 MCSection *MergeableConst8Section = nullptr; 186 MCSection *MergeableConst16Section = nullptr; 187 MCSection *MergeableConst32Section = nullptr; 188 189 // MachO specific sections. 190 191 /// Section for thread local structure information. 192 /// 193 /// Contains the source code name of the variable, visibility and a pointer to 194 /// the initial value (.tdata or .tbss). 195 MCSection *TLSTLVSection = nullptr; // Defaults to ".tlv". 196 197 /// Section for thread local data initialization functions. 198 // Defaults to ".thread_init_func". 199 const MCSection *TLSThreadInitSection = nullptr; 200 201 MCSection *CStringSection = nullptr; 202 MCSection *UStringSection = nullptr; 203 MCSection *TextCoalSection = nullptr; 204 MCSection *ConstTextCoalSection = nullptr; 205 MCSection *ConstDataSection = nullptr; 206 MCSection *DataCoalSection = nullptr; 207 MCSection *ConstDataCoalSection = nullptr; 208 MCSection *DataCommonSection = nullptr; 209 MCSection *DataBSSSection = nullptr; 210 MCSection *FourByteConstantSection = nullptr; 211 MCSection *EightByteConstantSection = nullptr; 212 MCSection *SixteenByteConstantSection = nullptr; 213 MCSection *LazySymbolPointerSection = nullptr; 214 MCSection *NonLazySymbolPointerSection = nullptr; 215 MCSection *ThreadLocalPointerSection = nullptr; 216 217 /// COFF specific sections. 218 MCSection *DrectveSection = nullptr; 219 MCSection *PDataSection = nullptr; 220 MCSection *XDataSection = nullptr; 221 MCSection *SXDataSection = nullptr; 222 MCSection *GEHContSection = nullptr; 223 MCSection *GFIDsSection = nullptr; 224 MCSection *GIATsSection = nullptr; 225 MCSection *GLJMPSection = nullptr; 226 227 // XCOFF specific sections 228 MCSection *TOCBaseSection = nullptr; 229 MCSection *ReadOnly8Section = nullptr; 230 MCSection *ReadOnly16Section = nullptr; 231 232 // Swift5 Reflection Data Sections 233 std::array<MCSection *, binaryformat::Swift5ReflectionSectionKind::last> 234 Swift5ReflectionSections = {}; 235 236 public: 237 void initMCObjectFileInfo(MCContext &MCCtx, bool PIC, 238 bool LargeCodeModel = false); 239 virtual ~MCObjectFileInfo(); 240 MCContext &getContext() const { return *Ctx; } 241 242 bool getSupportsWeakOmittedEHFrame() const { 243 return SupportsWeakOmittedEHFrame; 244 } 245 bool getSupportsCompactUnwindWithoutEHFrame() const { 246 return SupportsCompactUnwindWithoutEHFrame; 247 } 248 bool getOmitDwarfIfHaveCompactUnwind() const { 249 return OmitDwarfIfHaveCompactUnwind; 250 } 251 252 bool getCommDirectiveSupportsAlignment() const { 253 return CommDirectiveSupportsAlignment; 254 } 255 256 unsigned getFDEEncoding() const { return FDECFIEncoding; } 257 258 unsigned getCompactUnwindDwarfEHFrameOnly() const { 259 return CompactUnwindDwarfEHFrameOnly; 260 } 261 262 virtual unsigned getTextSectionAlignment() const { return 4; } 263 MCSection *getTextSection() const { return TextSection; } 264 MCSection *getDataSection() const { return DataSection; } 265 MCSection *getBSSSection() const { return BSSSection; } 266 MCSection *getReadOnlySection() const { return ReadOnlySection; } 267 MCSection *getLSDASection() const { return LSDASection; } 268 MCSection *getCompactUnwindSection() const { return CompactUnwindSection; } 269 MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; } 270 MCSection *getDwarfInfoSection() const { return DwarfInfoSection; } 271 MCSection *getDwarfInfoSection(uint64_t Hash) const { 272 return getDwarfComdatSection(".debug_info", Hash); 273 } 274 MCSection *getDwarfLineSection() const { return DwarfLineSection; } 275 MCSection *getDwarfLineStrSection() const { return DwarfLineStrSection; } 276 MCSection *getDwarfFrameSection() const { return DwarfFrameSection; } 277 MCSection *getDwarfPubNamesSection() const { return DwarfPubNamesSection; } 278 MCSection *getDwarfPubTypesSection() const { return DwarfPubTypesSection; } 279 MCSection *getDwarfGnuPubNamesSection() const { 280 return DwarfGnuPubNamesSection; 281 } 282 MCSection *getDwarfGnuPubTypesSection() const { 283 return DwarfGnuPubTypesSection; 284 } 285 const MCSection *getDwarfDebugInlineSection() const { 286 return DwarfDebugInlineSection; 287 } 288 MCSection *getDwarfStrSection() const { return DwarfStrSection; } 289 MCSection *getDwarfLocSection() const { return DwarfLocSection; } 290 MCSection *getDwarfARangesSection() const { return DwarfARangesSection; } 291 MCSection *getDwarfRangesSection() const { return DwarfRangesSection; } 292 MCSection *getDwarfRnglistsSection() const { return DwarfRnglistsSection; } 293 MCSection *getDwarfLoclistsSection() const { return DwarfLoclistsSection; } 294 MCSection *getDwarfMacinfoSection() const { return DwarfMacinfoSection; } 295 MCSection *getDwarfMacroSection() const { return DwarfMacroSection; } 296 297 MCSection *getDwarfDebugNamesSection() const { 298 return DwarfDebugNamesSection; 299 } 300 MCSection *getDwarfAccelNamesSection() const { 301 return DwarfAccelNamesSection; 302 } 303 MCSection *getDwarfAccelObjCSection() const { return DwarfAccelObjCSection; } 304 MCSection *getDwarfAccelNamespaceSection() const { 305 return DwarfAccelNamespaceSection; 306 } 307 MCSection *getDwarfAccelTypesSection() const { 308 return DwarfAccelTypesSection; 309 } 310 MCSection *getDwarfInfoDWOSection() const { return DwarfInfoDWOSection; } 311 MCSection *getDwarfTypesSection(uint64_t Hash) const { 312 return getDwarfComdatSection(".debug_types", Hash); 313 } 314 MCSection *getDwarfTypesDWOSection() const { return DwarfTypesDWOSection; } 315 MCSection *getDwarfAbbrevDWOSection() const { return DwarfAbbrevDWOSection; } 316 MCSection *getDwarfStrDWOSection() const { return DwarfStrDWOSection; } 317 MCSection *getDwarfLineDWOSection() const { return DwarfLineDWOSection; } 318 MCSection *getDwarfLocDWOSection() const { return DwarfLocDWOSection; } 319 MCSection *getDwarfStrOffDWOSection() const { return DwarfStrOffDWOSection; } 320 MCSection *getDwarfStrOffSection() const { return DwarfStrOffSection; } 321 MCSection *getDwarfAddrSection() const { return DwarfAddrSection; } 322 MCSection *getDwarfRnglistsDWOSection() const { 323 return DwarfRnglistsDWOSection; 324 } 325 MCSection *getDwarfLoclistsDWOSection() const { 326 return DwarfLoclistsDWOSection; 327 } 328 MCSection *getDwarfMacroDWOSection() const { return DwarfMacroDWOSection; } 329 MCSection *getDwarfMacinfoDWOSection() const { 330 return DwarfMacinfoDWOSection; 331 } 332 MCSection *getDwarfCUIndexSection() const { return DwarfCUIndexSection; } 333 MCSection *getDwarfTUIndexSection() const { return DwarfTUIndexSection; } 334 MCSection *getDwarfSwiftASTSection() const { return DwarfSwiftASTSection; } 335 336 MCSection *getCOFFDebugSymbolsSection() const { 337 return COFFDebugSymbolsSection; 338 } 339 MCSection *getCOFFDebugTypesSection() const { 340 return COFFDebugTypesSection; 341 } 342 MCSection *getCOFFGlobalTypeHashesSection() const { 343 return COFFGlobalTypeHashesSection; 344 } 345 346 MCSection *getTLSExtraDataSection() const { return TLSExtraDataSection; } 347 const MCSection *getTLSDataSection() const { return TLSDataSection; } 348 MCSection *getTLSBSSSection() const { return TLSBSSSection; } 349 350 MCSection *getStackMapSection() const { return StackMapSection; } 351 MCSection *getFaultMapSection() const { return FaultMapSection; } 352 MCSection *getRemarksSection() const { return RemarksSection; } 353 354 MCSection *getStackSizesSection(const MCSection &TextSec) const; 355 356 MCSection *getBBAddrMapSection(const MCSection &TextSec) const; 357 358 MCSection *getPseudoProbeSection(const MCSection *TextSec) const; 359 360 MCSection *getPseudoProbeDescSection(StringRef FuncName) const; 361 362 // ELF specific sections. 363 MCSection *getDataRelROSection() const { return DataRelROSection; } 364 const MCSection *getMergeableConst4Section() const { 365 return MergeableConst4Section; 366 } 367 const MCSection *getMergeableConst8Section() const { 368 return MergeableConst8Section; 369 } 370 const MCSection *getMergeableConst16Section() const { 371 return MergeableConst16Section; 372 } 373 const MCSection *getMergeableConst32Section() const { 374 return MergeableConst32Section; 375 } 376 377 // MachO specific sections. 378 const MCSection *getTLSTLVSection() const { return TLSTLVSection; } 379 const MCSection *getTLSThreadInitSection() const { 380 return TLSThreadInitSection; 381 } 382 const MCSection *getCStringSection() const { return CStringSection; } 383 const MCSection *getUStringSection() const { return UStringSection; } 384 MCSection *getTextCoalSection() const { return TextCoalSection; } 385 const MCSection *getConstTextCoalSection() const { 386 return ConstTextCoalSection; 387 } 388 const MCSection *getConstDataSection() const { return ConstDataSection; } 389 const MCSection *getDataCoalSection() const { return DataCoalSection; } 390 const MCSection *getConstDataCoalSection() const { 391 return ConstDataCoalSection; 392 } 393 const MCSection *getDataCommonSection() const { return DataCommonSection; } 394 MCSection *getDataBSSSection() const { return DataBSSSection; } 395 const MCSection *getFourByteConstantSection() const { 396 return FourByteConstantSection; 397 } 398 const MCSection *getEightByteConstantSection() const { 399 return EightByteConstantSection; 400 } 401 const MCSection *getSixteenByteConstantSection() const { 402 return SixteenByteConstantSection; 403 } 404 MCSection *getLazySymbolPointerSection() const { 405 return LazySymbolPointerSection; 406 } 407 MCSection *getNonLazySymbolPointerSection() const { 408 return NonLazySymbolPointerSection; 409 } 410 MCSection *getThreadLocalPointerSection() const { 411 return ThreadLocalPointerSection; 412 } 413 414 // COFF specific sections. 415 MCSection *getDrectveSection() const { return DrectveSection; } 416 MCSection *getPDataSection() const { return PDataSection; } 417 MCSection *getXDataSection() const { return XDataSection; } 418 MCSection *getSXDataSection() const { return SXDataSection; } 419 MCSection *getGEHContSection() const { return GEHContSection; } 420 MCSection *getGFIDsSection() const { return GFIDsSection; } 421 MCSection *getGIATsSection() const { return GIATsSection; } 422 MCSection *getGLJMPSection() const { return GLJMPSection; } 423 424 // XCOFF specific sections 425 MCSection *getTOCBaseSection() const { return TOCBaseSection; } 426 427 MCSection *getEHFrameSection() const { return EHFrameSection; } 428 429 bool isPositionIndependent() const { return PositionIndependent; } 430 431 // Swift5 Reflection Data Sections 432 MCSection *getSwift5ReflectionSection( 433 llvm::binaryformat::Swift5ReflectionSectionKind ReflSectionKind) { 434 return ReflSectionKind != 435 llvm::binaryformat::Swift5ReflectionSectionKind::unknown 436 ? Swift5ReflectionSections[ReflSectionKind] 437 : nullptr; 438 } 439 440 private: 441 bool PositionIndependent = false; 442 MCContext *Ctx = nullptr; 443 VersionTuple SDKVersion; 444 Optional<Triple> DarwinTargetVariantTriple; 445 VersionTuple DarwinTargetVariantSDKVersion; 446 447 void initMachOMCObjectFileInfo(const Triple &T); 448 void initELFMCObjectFileInfo(const Triple &T, bool Large); 449 void initGOFFMCObjectFileInfo(const Triple &T); 450 void initCOFFMCObjectFileInfo(const Triple &T); 451 void initWasmMCObjectFileInfo(const Triple &T); 452 void initXCOFFMCObjectFileInfo(const Triple &T); 453 MCSection *getDwarfComdatSection(const char *Name, uint64_t Hash) const; 454 455 public: 456 void setSDKVersion(const VersionTuple &TheSDKVersion) { 457 SDKVersion = TheSDKVersion; 458 } 459 460 const VersionTuple &getSDKVersion() const { return SDKVersion; } 461 462 void setDarwinTargetVariantTriple(const Triple &T) { 463 DarwinTargetVariantTriple = T; 464 } 465 466 const Triple *getDarwinTargetVariantTriple() const { 467 return DarwinTargetVariantTriple ? DarwinTargetVariantTriple.getPointer() 468 : nullptr; 469 } 470 471 void setDarwinTargetVariantSDKVersion(const VersionTuple &TheSDKVersion) { 472 DarwinTargetVariantSDKVersion = TheSDKVersion; 473 } 474 475 const VersionTuple &getDarwinTargetVariantSDKVersion() const { 476 return DarwinTargetVariantSDKVersion; 477 } 478 }; 479 480 } // end namespace llvm 481 482 #endif 483