1 //===- MCContext.h - Machine Code Context -----------------------*- 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 #ifndef LLVM_MC_MCCONTEXT_H 11 #define LLVM_MC_MCCONTEXT_H 12 13 #include "llvm/ADT/DenseMap.h" 14 #include "llvm/ADT/SetVector.h" 15 #include "llvm/ADT/SmallString.h" 16 #include "llvm/ADT/SmallVector.h" 17 #include "llvm/ADT/StringMap.h" 18 #include "llvm/ADT/StringRef.h" 19 #include "llvm/ADT/Twine.h" 20 #include "llvm/BinaryFormat/Dwarf.h" 21 #include "llvm/MC/MCDwarf.h" 22 #include "llvm/MC/MCSubtargetInfo.h" 23 #include "llvm/MC/SectionKind.h" 24 #include "llvm/Support/Allocator.h" 25 #include "llvm/Support/Compiler.h" 26 #include "llvm/Support/raw_ostream.h" 27 #include <algorithm> 28 #include <cassert> 29 #include <cstddef> 30 #include <cstdint> 31 #include <map> 32 #include <memory> 33 #include <string> 34 #include <utility> 35 #include <vector> 36 37 namespace llvm { 38 39 class CodeViewContext; 40 class MCAsmInfo; 41 class MCLabel; 42 class MCObjectFileInfo; 43 class MCRegisterInfo; 44 class MCSection; 45 class MCSectionCOFF; 46 class MCSectionELF; 47 class MCSectionMachO; 48 class MCSectionWasm; 49 class MCStreamer; 50 class MCSymbol; 51 class MCSymbolELF; 52 class MCSymbolWasm; 53 class SMLoc; 54 class SourceMgr; 55 56 /// Context object for machine code objects. This class owns all of the 57 /// sections that it creates. 58 /// 59 class MCContext { 60 public: 61 using SymbolTable = StringMap<MCSymbol *, BumpPtrAllocator &>; 62 63 private: 64 /// The SourceMgr for this object, if any. 65 const SourceMgr *SrcMgr; 66 67 /// The SourceMgr for inline assembly, if any. 68 SourceMgr *InlineSrcMgr; 69 70 /// The MCAsmInfo for this target. 71 const MCAsmInfo *MAI; 72 73 /// The MCRegisterInfo for this target. 74 const MCRegisterInfo *MRI; 75 76 /// The MCObjectFileInfo for this target. 77 const MCObjectFileInfo *MOFI; 78 79 std::unique_ptr<CodeViewContext> CVContext; 80 81 /// Allocator object used for creating machine code objects. 82 /// 83 /// We use a bump pointer allocator to avoid the need to track all allocated 84 /// objects. 85 BumpPtrAllocator Allocator; 86 87 SpecificBumpPtrAllocator<MCSectionCOFF> COFFAllocator; 88 SpecificBumpPtrAllocator<MCSectionELF> ELFAllocator; 89 SpecificBumpPtrAllocator<MCSectionMachO> MachOAllocator; 90 SpecificBumpPtrAllocator<MCSectionWasm> WasmAllocator; 91 92 /// Bindings of names to symbols. 93 SymbolTable Symbols; 94 95 /// A mapping from a local label number and an instance count to a symbol. 96 /// For example, in the assembly 97 /// 1: 98 /// 2: 99 /// 1: 100 /// We have three labels represented by the pairs (1, 0), (2, 0) and (1, 1) 101 DenseMap<std::pair<unsigned, unsigned>, MCSymbol *> LocalSymbols; 102 103 /// Keeps tracks of names that were used both for used declared and 104 /// artificial symbols. The value is "true" if the name has been used for a 105 /// non-section symbol (there can be at most one of those, plus an unlimited 106 /// number of section symbols with the same name). 107 StringMap<bool, BumpPtrAllocator &> UsedNames; 108 109 /// The next ID to dole out to an unnamed assembler temporary symbol with 110 /// a given prefix. 111 StringMap<unsigned> NextID; 112 113 /// Instances of directional local labels. 114 DenseMap<unsigned, MCLabel *> Instances; 115 /// NextInstance() creates the next instance of the directional local label 116 /// for the LocalLabelVal and adds it to the map if needed. 117 unsigned NextInstance(unsigned LocalLabelVal); 118 /// GetInstance() gets the current instance of the directional local label 119 /// for the LocalLabelVal and adds it to the map if needed. 120 unsigned GetInstance(unsigned LocalLabelVal); 121 122 /// The file name of the log file from the environment variable 123 /// AS_SECURE_LOG_FILE. Which must be set before the .secure_log_unique 124 /// directive is used or it is an error. 125 char *SecureLogFile; 126 /// The stream that gets written to for the .secure_log_unique directive. 127 std::unique_ptr<raw_fd_ostream> SecureLog; 128 /// Boolean toggled when .secure_log_unique / .secure_log_reset is seen to 129 /// catch errors if .secure_log_unique appears twice without 130 /// .secure_log_reset appearing between them. 131 bool SecureLogUsed = false; 132 133 /// The compilation directory to use for DW_AT_comp_dir. 134 SmallString<128> CompilationDir; 135 136 /// The main file name if passed in explicitly. 137 std::string MainFileName; 138 139 /// The dwarf file and directory tables from the dwarf .file directive. 140 /// We now emit a line table for each compile unit. To reduce the prologue 141 /// size of each line table, the files and directories used by each compile 142 /// unit are separated. 143 std::map<unsigned, MCDwarfLineTable> MCDwarfLineTablesCUMap; 144 145 /// The current dwarf line information from the last dwarf .loc directive. 146 MCDwarfLoc CurrentDwarfLoc; 147 bool DwarfLocSeen = false; 148 149 /// Generate dwarf debugging info for assembly source files. 150 bool GenDwarfForAssembly = false; 151 152 /// The current dwarf file number when generate dwarf debugging info for 153 /// assembly source files. 154 unsigned GenDwarfFileNumber = 0; 155 156 /// Sections for generating the .debug_ranges and .debug_aranges sections. 157 SetVector<MCSection *> SectionsForRanges; 158 159 /// The information gathered from labels that will have dwarf label 160 /// entries when generating dwarf assembly source files. 161 std::vector<MCGenDwarfLabelEntry> MCGenDwarfLabelEntries; 162 163 /// The string to embed in the debug information for the compile unit, if 164 /// non-empty. 165 StringRef DwarfDebugFlags; 166 167 /// The string to embed in as the dwarf AT_producer for the compile unit, if 168 /// non-empty. 169 StringRef DwarfDebugProducer; 170 171 /// The maximum version of dwarf that we should emit. 172 uint16_t DwarfVersion = 4; 173 174 /// Honor temporary labels, this is useful for debugging semantic 175 /// differences between temporary and non-temporary labels (primarily on 176 /// Darwin). 177 bool AllowTemporaryLabels = true; 178 bool UseNamesOnTempLabels = true; 179 180 /// The Compile Unit ID that we are currently processing. 181 unsigned DwarfCompileUnitID = 0; 182 183 struct ELFSectionKey { 184 std::string SectionName; 185 StringRef GroupName; 186 unsigned UniqueID; 187 188 ELFSectionKey(StringRef SectionName, StringRef GroupName, 189 unsigned UniqueID) 190 : SectionName(SectionName), GroupName(GroupName), UniqueID(UniqueID) { 191 } 192 193 bool operator<(const ELFSectionKey &Other) const { 194 if (SectionName != Other.SectionName) 195 return SectionName < Other.SectionName; 196 if (GroupName != Other.GroupName) 197 return GroupName < Other.GroupName; 198 return UniqueID < Other.UniqueID; 199 } 200 }; 201 202 struct COFFSectionKey { 203 std::string SectionName; 204 StringRef GroupName; 205 int SelectionKey; 206 unsigned UniqueID; 207 208 COFFSectionKey(StringRef SectionName, StringRef GroupName, 209 int SelectionKey, unsigned UniqueID) 210 : SectionName(SectionName), GroupName(GroupName), 211 SelectionKey(SelectionKey), UniqueID(UniqueID) {} 212 213 bool operator<(const COFFSectionKey &Other) const { 214 if (SectionName != Other.SectionName) 215 return SectionName < Other.SectionName; 216 if (GroupName != Other.GroupName) 217 return GroupName < Other.GroupName; 218 if (SelectionKey != Other.SelectionKey) 219 return SelectionKey < Other.SelectionKey; 220 return UniqueID < Other.UniqueID; 221 } 222 }; 223 224 struct WasmSectionKey { 225 std::string SectionName; 226 StringRef GroupName; 227 unsigned UniqueID; 228 229 WasmSectionKey(StringRef SectionName, StringRef GroupName, 230 unsigned UniqueID) 231 : SectionName(SectionName), GroupName(GroupName), UniqueID(UniqueID) { 232 } 233 234 bool operator<(const WasmSectionKey &Other) const { 235 if (SectionName != Other.SectionName) 236 return SectionName < Other.SectionName; 237 if (GroupName != Other.GroupName) 238 return GroupName < Other.GroupName; 239 return UniqueID < Other.UniqueID; 240 } 241 }; 242 243 StringMap<MCSectionMachO *> MachOUniquingMap; 244 std::map<ELFSectionKey, MCSectionELF *> ELFUniquingMap; 245 std::map<COFFSectionKey, MCSectionCOFF *> COFFUniquingMap; 246 std::map<WasmSectionKey, MCSectionWasm *> WasmUniquingMap; 247 StringMap<bool> RelSecNames; 248 249 SpecificBumpPtrAllocator<MCSubtargetInfo> MCSubtargetAllocator; 250 251 /// Do automatic reset in destructor 252 bool AutoReset; 253 254 bool HadError = false; 255 256 MCSymbol *createSymbolImpl(const StringMapEntry<bool> *Name, 257 bool CanBeUnnamed); 258 MCSymbol *createSymbol(StringRef Name, bool AlwaysAddSuffix, 259 bool IsTemporary); 260 261 MCSymbol *getOrCreateDirectionalLocalSymbol(unsigned LocalLabelVal, 262 unsigned Instance); 263 264 MCSectionELF *createELFSectionImpl(StringRef Section, unsigned Type, 265 unsigned Flags, SectionKind K, 266 unsigned EntrySize, 267 const MCSymbolELF *Group, 268 unsigned UniqueID, 269 const MCSymbolELF *Associated); 270 271 public: 272 explicit MCContext(const MCAsmInfo *MAI, const MCRegisterInfo *MRI, 273 const MCObjectFileInfo *MOFI, 274 const SourceMgr *Mgr = nullptr, bool DoAutoReset = true); 275 MCContext(const MCContext &) = delete; 276 MCContext &operator=(const MCContext &) = delete; 277 ~MCContext(); 278 279 const SourceMgr *getSourceManager() const { return SrcMgr; } 280 281 void setInlineSourceManager(SourceMgr *SM) { InlineSrcMgr = SM; } 282 283 const MCAsmInfo *getAsmInfo() const { return MAI; } 284 285 const MCRegisterInfo *getRegisterInfo() const { return MRI; } 286 287 const MCObjectFileInfo *getObjectFileInfo() const { return MOFI; } 288 289 CodeViewContext &getCVContext(); 290 291 void setAllowTemporaryLabels(bool Value) { AllowTemporaryLabels = Value; } 292 void setUseNamesOnTempLabels(bool Value) { UseNamesOnTempLabels = Value; } 293 294 /// \name Module Lifetime Management 295 /// @{ 296 297 /// reset - return object to right after construction state to prepare 298 /// to process a new module 299 void reset(); 300 301 /// @} 302 303 /// \name Symbol Management 304 /// @{ 305 306 /// Create and return a new linker temporary symbol with a unique but 307 /// unspecified name. 308 MCSymbol *createLinkerPrivateTempSymbol(); 309 310 /// Create and return a new assembler temporary symbol with a unique but 311 /// unspecified name. 312 MCSymbol *createTempSymbol(bool CanBeUnnamed = true); 313 314 MCSymbol *createTempSymbol(const Twine &Name, bool AlwaysAddSuffix, 315 bool CanBeUnnamed = true); 316 317 /// Create the definition of a directional local symbol for numbered label 318 /// (used for "1:" definitions). 319 MCSymbol *createDirectionalLocalSymbol(unsigned LocalLabelVal); 320 321 /// Create and return a directional local symbol for numbered label (used 322 /// for "1b" or 1f" references). 323 MCSymbol *getDirectionalLocalSymbol(unsigned LocalLabelVal, bool Before); 324 325 /// Lookup the symbol inside with the specified \p Name. If it exists, 326 /// return it. If not, create a forward reference and return it. 327 /// 328 /// \param Name - The symbol name, which must be unique across all symbols. 329 MCSymbol *getOrCreateSymbol(const Twine &Name); 330 331 /// Gets a symbol that will be defined to the final stack offset of a local 332 /// variable after codegen. 333 /// 334 /// \param Idx - The index of a local variable passed to @llvm.localescape. 335 MCSymbol *getOrCreateFrameAllocSymbol(StringRef FuncName, unsigned Idx); 336 337 MCSymbol *getOrCreateParentFrameOffsetSymbol(StringRef FuncName); 338 339 MCSymbol *getOrCreateLSDASymbol(StringRef FuncName); 340 341 /// Get the symbol for \p Name, or null. 342 MCSymbol *lookupSymbol(const Twine &Name) const; 343 344 /// Set value for a symbol. 345 void setSymbolValue(MCStreamer &Streamer, StringRef Sym, uint64_t Val); 346 347 /// getSymbols - Get a reference for the symbol table for clients that 348 /// want to, for example, iterate over all symbols. 'const' because we 349 /// still want any modifications to the table itself to use the MCContext 350 /// APIs. 351 const SymbolTable &getSymbols() const { return Symbols; } 352 353 /// @} 354 355 /// \name Section Management 356 /// @{ 357 358 enum : unsigned { 359 /// Pass this value as the UniqueID during section creation to get the 360 /// generic section with the given name and characteristics. The usual 361 /// sections such as .text use this ID. 362 GenericSectionID = ~0U 363 }; 364 365 /// Return the MCSection for the specified mach-o section. This requires 366 /// the operands to be valid. 367 MCSectionMachO *getMachOSection(StringRef Segment, StringRef Section, 368 unsigned TypeAndAttributes, 369 unsigned Reserved2, SectionKind K, 370 const char *BeginSymName = nullptr); 371 372 MCSectionMachO *getMachOSection(StringRef Segment, StringRef Section, 373 unsigned TypeAndAttributes, SectionKind K, 374 const char *BeginSymName = nullptr) { 375 return getMachOSection(Segment, Section, TypeAndAttributes, 0, K, 376 BeginSymName); 377 } 378 379 MCSectionELF *getELFSection(const Twine &Section, unsigned Type, 380 unsigned Flags) { 381 return getELFSection(Section, Type, Flags, 0, ""); 382 } 383 384 MCSectionELF *getELFSection(const Twine &Section, unsigned Type, 385 unsigned Flags, unsigned EntrySize, 386 const Twine &Group) { 387 return getELFSection(Section, Type, Flags, EntrySize, Group, ~0); 388 } 389 390 MCSectionELF *getELFSection(const Twine &Section, unsigned Type, 391 unsigned Flags, unsigned EntrySize, 392 const Twine &Group, unsigned UniqueID) { 393 return getELFSection(Section, Type, Flags, EntrySize, Group, UniqueID, 394 nullptr); 395 } 396 397 MCSectionELF *getELFSection(const Twine &Section, unsigned Type, 398 unsigned Flags, unsigned EntrySize, 399 const Twine &Group, unsigned UniqueID, 400 const MCSymbolELF *Associated); 401 402 MCSectionELF *getELFSection(const Twine &Section, unsigned Type, 403 unsigned Flags, unsigned EntrySize, 404 const MCSymbolELF *Group, unsigned UniqueID, 405 const MCSymbolELF *Associated); 406 407 /// Get a section with the provided group identifier. This section is 408 /// named by concatenating \p Prefix with '.' then \p Suffix. The \p Type 409 /// describes the type of the section and \p Flags are used to further 410 /// configure this named section. 411 MCSectionELF *getELFNamedSection(const Twine &Prefix, const Twine &Suffix, 412 unsigned Type, unsigned Flags, 413 unsigned EntrySize = 0); 414 415 MCSectionELF *createELFRelSection(const Twine &Name, unsigned Type, 416 unsigned Flags, unsigned EntrySize, 417 const MCSymbolELF *Group, 418 const MCSectionELF *RelInfoSection); 419 420 void renameELFSection(MCSectionELF *Section, StringRef Name); 421 422 MCSectionELF *createELFGroupSection(const MCSymbolELF *Group); 423 424 MCSectionCOFF *getCOFFSection(StringRef Section, unsigned Characteristics, 425 SectionKind Kind, StringRef COMDATSymName, 426 int Selection, 427 unsigned UniqueID = GenericSectionID, 428 const char *BeginSymName = nullptr); 429 430 MCSectionCOFF *getCOFFSection(StringRef Section, unsigned Characteristics, 431 SectionKind Kind, 432 const char *BeginSymName = nullptr); 433 434 MCSectionCOFF *getCOFFSection(StringRef Section); 435 436 /// Gets or creates a section equivalent to Sec that is associated with the 437 /// section containing KeySym. For example, to create a debug info section 438 /// associated with an inline function, pass the normal debug info section 439 /// as Sec and the function symbol as KeySym. 440 MCSectionCOFF * 441 getAssociativeCOFFSection(MCSectionCOFF *Sec, const MCSymbol *KeySym, 442 unsigned UniqueID = GenericSectionID); 443 444 MCSectionWasm *getWasmSection(const Twine &Section, unsigned Type, 445 unsigned Flags) { 446 return getWasmSection(Section, Type, Flags, nullptr); 447 } 448 449 MCSectionWasm *getWasmSection(const Twine &Section, unsigned Type, 450 unsigned Flags, const char *BeginSymName) { 451 return getWasmSection(Section, Type, Flags, "", BeginSymName); 452 } 453 454 MCSectionWasm *getWasmSection(const Twine &Section, unsigned Type, 455 unsigned Flags, const Twine &Group) { 456 return getWasmSection(Section, Type, Flags, Group, nullptr); 457 } 458 459 MCSectionWasm *getWasmSection(const Twine &Section, unsigned Type, 460 unsigned Flags, const Twine &Group, 461 const char *BeginSymName) { 462 return getWasmSection(Section, Type, Flags, Group, ~0, BeginSymName); 463 } 464 465 MCSectionWasm *getWasmSection(const Twine &Section, unsigned Type, 466 unsigned Flags, const Twine &Group, 467 unsigned UniqueID) { 468 return getWasmSection(Section, Type, Flags, Group, UniqueID, nullptr); 469 } 470 471 MCSectionWasm *getWasmSection(const Twine &Section, unsigned Type, 472 unsigned Flags, const Twine &Group, 473 unsigned UniqueID, const char *BeginSymName); 474 475 MCSectionWasm *getWasmSection(const Twine &Section, unsigned Type, 476 unsigned Flags, const MCSymbolWasm *Group, 477 unsigned UniqueID, const char *BeginSymName); 478 479 /// Get a section with the provided group identifier. This section is 480 /// named by concatenating \p Prefix with '.' then \p Suffix. The \p Type 481 /// describes the type of the section and \p Flags are used to further 482 /// configure this named section. 483 MCSectionWasm *getWasmNamedSection(const Twine &Prefix, const Twine &Suffix, 484 unsigned Type, unsigned Flags); 485 486 MCSectionWasm *createWasmRelSection(const Twine &Name, unsigned Type, 487 unsigned Flags, 488 const MCSymbolWasm *Group); 489 490 void renameWasmSection(MCSectionWasm *Section, StringRef Name); 491 492 // Create and save a copy of STI and return a reference to the copy. 493 MCSubtargetInfo &getSubtargetCopy(const MCSubtargetInfo &STI); 494 495 /// @} 496 497 /// \name Dwarf Management 498 /// @{ 499 500 /// \brief Get the compilation directory for DW_AT_comp_dir 501 /// The compilation directory should be set with \c setCompilationDir before 502 /// calling this function. If it is unset, an empty string will be returned. 503 StringRef getCompilationDir() const { return CompilationDir; } 504 505 /// \brief Set the compilation directory for DW_AT_comp_dir 506 void setCompilationDir(StringRef S) { CompilationDir = S.str(); } 507 508 /// \brief Get the main file name for use in error messages and debug 509 /// info. This can be set to ensure we've got the correct file name 510 /// after preprocessing or for -save-temps. 511 const std::string &getMainFileName() const { return MainFileName; } 512 513 /// \brief Set the main file name and override the default. 514 void setMainFileName(StringRef S) { MainFileName = S; } 515 516 /// Creates an entry in the dwarf file and directory tables. 517 unsigned getDwarfFile(StringRef Directory, StringRef FileName, 518 unsigned FileNumber, unsigned CUID); 519 520 bool isValidDwarfFileNumber(unsigned FileNumber, unsigned CUID = 0); 521 522 const std::map<unsigned, MCDwarfLineTable> &getMCDwarfLineTables() const { 523 return MCDwarfLineTablesCUMap; 524 } 525 526 MCDwarfLineTable &getMCDwarfLineTable(unsigned CUID) { 527 return MCDwarfLineTablesCUMap[CUID]; 528 } 529 530 const MCDwarfLineTable &getMCDwarfLineTable(unsigned CUID) const { 531 auto I = MCDwarfLineTablesCUMap.find(CUID); 532 assert(I != MCDwarfLineTablesCUMap.end()); 533 return I->second; 534 } 535 536 const SmallVectorImpl<MCDwarfFile> &getMCDwarfFiles(unsigned CUID = 0) { 537 return getMCDwarfLineTable(CUID).getMCDwarfFiles(); 538 } 539 540 const SmallVectorImpl<std::string> &getMCDwarfDirs(unsigned CUID = 0) { 541 return getMCDwarfLineTable(CUID).getMCDwarfDirs(); 542 } 543 544 bool hasMCLineSections() const { 545 for (const auto &Table : MCDwarfLineTablesCUMap) 546 if (!Table.second.getMCDwarfFiles().empty() || Table.second.getLabel()) 547 return true; 548 return false; 549 } 550 551 unsigned getDwarfCompileUnitID() { return DwarfCompileUnitID; } 552 553 void setDwarfCompileUnitID(unsigned CUIndex) { 554 DwarfCompileUnitID = CUIndex; 555 } 556 557 void setMCLineTableCompilationDir(unsigned CUID, StringRef CompilationDir) { 558 getMCDwarfLineTable(CUID).setCompilationDir(CompilationDir); 559 } 560 561 /// Saves the information from the currently parsed dwarf .loc directive 562 /// and sets DwarfLocSeen. When the next instruction is assembled an entry 563 /// in the line number table with this information and the address of the 564 /// instruction will be created. 565 void setCurrentDwarfLoc(unsigned FileNum, unsigned Line, unsigned Column, 566 unsigned Flags, unsigned Isa, 567 unsigned Discriminator) { 568 CurrentDwarfLoc.setFileNum(FileNum); 569 CurrentDwarfLoc.setLine(Line); 570 CurrentDwarfLoc.setColumn(Column); 571 CurrentDwarfLoc.setFlags(Flags); 572 CurrentDwarfLoc.setIsa(Isa); 573 CurrentDwarfLoc.setDiscriminator(Discriminator); 574 DwarfLocSeen = true; 575 } 576 577 void clearDwarfLocSeen() { DwarfLocSeen = false; } 578 579 bool getDwarfLocSeen() { return DwarfLocSeen; } 580 const MCDwarfLoc &getCurrentDwarfLoc() { return CurrentDwarfLoc; } 581 582 bool getGenDwarfForAssembly() { return GenDwarfForAssembly; } 583 void setGenDwarfForAssembly(bool Value) { GenDwarfForAssembly = Value; } 584 unsigned getGenDwarfFileNumber() { return GenDwarfFileNumber; } 585 586 void setGenDwarfFileNumber(unsigned FileNumber) { 587 GenDwarfFileNumber = FileNumber; 588 } 589 590 const SetVector<MCSection *> &getGenDwarfSectionSyms() { 591 return SectionsForRanges; 592 } 593 594 bool addGenDwarfSection(MCSection *Sec) { 595 return SectionsForRanges.insert(Sec); 596 } 597 598 void finalizeDwarfSections(MCStreamer &MCOS); 599 600 const std::vector<MCGenDwarfLabelEntry> &getMCGenDwarfLabelEntries() const { 601 return MCGenDwarfLabelEntries; 602 } 603 604 void addMCGenDwarfLabelEntry(const MCGenDwarfLabelEntry &E) { 605 MCGenDwarfLabelEntries.push_back(E); 606 } 607 608 void setDwarfDebugFlags(StringRef S) { DwarfDebugFlags = S; } 609 StringRef getDwarfDebugFlags() { return DwarfDebugFlags; } 610 611 void setDwarfDebugProducer(StringRef S) { DwarfDebugProducer = S; } 612 StringRef getDwarfDebugProducer() { return DwarfDebugProducer; } 613 614 dwarf::DwarfFormat getDwarfFormat() const { 615 // TODO: Support DWARF64 616 return dwarf::DWARF32; 617 } 618 619 void setDwarfVersion(uint16_t v) { DwarfVersion = v; } 620 uint16_t getDwarfVersion() const { return DwarfVersion; } 621 622 /// @} 623 624 char *getSecureLogFile() { return SecureLogFile; } 625 raw_fd_ostream *getSecureLog() { return SecureLog.get(); } 626 627 void setSecureLog(std::unique_ptr<raw_fd_ostream> Value) { 628 SecureLog = std::move(Value); 629 } 630 631 bool getSecureLogUsed() { return SecureLogUsed; } 632 void setSecureLogUsed(bool Value) { SecureLogUsed = Value; } 633 634 void *allocate(unsigned Size, unsigned Align = 8) { 635 return Allocator.Allocate(Size, Align); 636 } 637 638 void deallocate(void *Ptr) {} 639 640 bool hadError() { return HadError; } 641 void reportError(SMLoc L, const Twine &Msg); 642 // Unrecoverable error has occurred. Display the best diagnostic we can 643 // and bail via exit(1). For now, most MC backend errors are unrecoverable. 644 // FIXME: We should really do something about that. 645 LLVM_ATTRIBUTE_NORETURN void reportFatalError(SMLoc L, 646 const Twine &Msg); 647 }; 648 649 } // end namespace llvm 650 651 // operator new and delete aren't allowed inside namespaces. 652 // The throw specifications are mandated by the standard. 653 /// \brief Placement new for using the MCContext's allocator. 654 /// 655 /// This placement form of operator new uses the MCContext's allocator for 656 /// obtaining memory. It is a non-throwing new, which means that it returns 657 /// null on error. (If that is what the allocator does. The current does, so if 658 /// this ever changes, this operator will have to be changed, too.) 659 /// Usage looks like this (assuming there's an MCContext 'Context' in scope): 660 /// \code 661 /// // Default alignment (8) 662 /// IntegerLiteral *Ex = new (Context) IntegerLiteral(arguments); 663 /// // Specific alignment 664 /// IntegerLiteral *Ex2 = new (Context, 4) IntegerLiteral(arguments); 665 /// \endcode 666 /// Please note that you cannot use delete on the pointer; it must be 667 /// deallocated using an explicit destructor call followed by 668 /// \c Context.Deallocate(Ptr). 669 /// 670 /// \param Bytes The number of bytes to allocate. Calculated by the compiler. 671 /// \param C The MCContext that provides the allocator. 672 /// \param Alignment The alignment of the allocated memory (if the underlying 673 /// allocator supports it). 674 /// \return The allocated memory. Could be NULL. 675 inline void *operator new(size_t Bytes, llvm::MCContext &C, 676 size_t Alignment = 8) noexcept { 677 return C.allocate(Bytes, Alignment); 678 } 679 /// \brief Placement delete companion to the new above. 680 /// 681 /// This operator is just a companion to the new above. There is no way of 682 /// invoking it directly; see the new operator for more details. This operator 683 /// is called implicitly by the compiler if a placement new expression using 684 /// the MCContext throws in the object constructor. 685 inline void operator delete(void *Ptr, llvm::MCContext &C, size_t) noexcept { 686 C.deallocate(Ptr); 687 } 688 689 /// This placement form of operator new[] uses the MCContext's allocator for 690 /// obtaining memory. It is a non-throwing new[], which means that it returns 691 /// null on error. 692 /// Usage looks like this (assuming there's an MCContext 'Context' in scope): 693 /// \code 694 /// // Default alignment (8) 695 /// char *data = new (Context) char[10]; 696 /// // Specific alignment 697 /// char *data = new (Context, 4) char[10]; 698 /// \endcode 699 /// Please note that you cannot use delete on the pointer; it must be 700 /// deallocated using an explicit destructor call followed by 701 /// \c Context.Deallocate(Ptr). 702 /// 703 /// \param Bytes The number of bytes to allocate. Calculated by the compiler. 704 /// \param C The MCContext that provides the allocator. 705 /// \param Alignment The alignment of the allocated memory (if the underlying 706 /// allocator supports it). 707 /// \return The allocated memory. Could be NULL. 708 inline void *operator new[](size_t Bytes, llvm::MCContext &C, 709 size_t Alignment = 8) noexcept { 710 return C.allocate(Bytes, Alignment); 711 } 712 713 /// \brief Placement delete[] companion to the new[] above. 714 /// 715 /// This operator is just a companion to the new[] above. There is no way of 716 /// invoking it directly; see the new[] operator for more details. This operator 717 /// is called implicitly by the compiler if a placement new[] expression using 718 /// the MCContext throws in the object constructor. 719 inline void operator delete[](void *Ptr, llvm::MCContext &C) noexcept { 720 C.deallocate(Ptr); 721 } 722 723 #endif // LLVM_MC_MCCONTEXT_H 724
