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  1. //===- llvm/TextAPI/Symbol.h - TAPI Symbol ----------------------*- 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. #ifndef LLVM_TEXTAPI_SYMBOL_H
  10. #define LLVM_TEXTAPI_SYMBOL_H
  11.  
  12. #include "llvm/ADT/BitmaskEnum.h"
  13. #include "llvm/ADT/StringRef.h"
  14. #include "llvm/Support/raw_ostream.h"
  15. #include "llvm/TextAPI/ArchitectureSet.h"
  16. #include "llvm/TextAPI/Target.h"
  17.  
  18. namespace llvm {
  19. namespace MachO {
  20.  
  21. // clang-format off
  22.  
  23. /// Symbol flags.
  24. enum class SymbolFlags : uint8_t {
  25.   /// No flags
  26.   None             = 0,
  27.  
  28.   /// Thread-local value symbol
  29.   ThreadLocalValue = 1U << 0,
  30.  
  31.   /// Weak defined symbol
  32.   WeakDefined      = 1U << 1,
  33.  
  34.   /// Weak referenced symbol
  35.   WeakReferenced   = 1U << 2,
  36.  
  37.   /// Undefined
  38.   Undefined        = 1U << 3,
  39.  
  40.   /// Rexported
  41.   Rexported        = 1U << 4,
  42.  
  43.   LLVM_MARK_AS_BITMASK_ENUM(/*LargestValue=*/Rexported),
  44. };
  45.  
  46. // clang-format on
  47.  
  48. enum class SymbolKind : uint8_t {
  49.   GlobalSymbol,
  50.   ObjectiveCClass,
  51.   ObjectiveCClassEHType,
  52.   ObjectiveCInstanceVariable,
  53. };
  54.  
  55. constexpr StringLiteral ObjC1ClassNamePrefix = ".objc_class_name_";
  56. constexpr StringLiteral ObjC2ClassNamePrefix = "_OBJC_CLASS_$_";
  57. constexpr StringLiteral ObjC2MetaClassNamePrefix = "_OBJC_METACLASS_$_";
  58. constexpr StringLiteral ObjC2EHTypePrefix = "_OBJC_EHTYPE_$_";
  59. constexpr StringLiteral ObjC2IVarPrefix = "_OBJC_IVAR_$_";
  60.  
  61. using TargetList = SmallVector<Target, 5>;
  62. class Symbol {
  63. public:
  64.   Symbol(SymbolKind Kind, StringRef Name, TargetList Targets, SymbolFlags Flags)
  65.       : Name(Name), Targets(std::move(Targets)), Kind(Kind), Flags(Flags) {}
  66.  
  67.   void addTarget(Target target) { Targets.emplace_back(target); }
  68.   SymbolKind getKind() const { return Kind; }
  69.   StringRef getName() const { return Name; }
  70.   ArchitectureSet getArchitectures() const {
  71.     return mapToArchitectureSet(Targets);
  72.   }
  73.   SymbolFlags getFlags() const { return Flags; }
  74.  
  75.   bool isWeakDefined() const {
  76.     return (Flags & SymbolFlags::WeakDefined) == SymbolFlags::WeakDefined;
  77.   }
  78.  
  79.   bool isWeakReferenced() const {
  80.     return (Flags & SymbolFlags::WeakReferenced) == SymbolFlags::WeakReferenced;
  81.   }
  82.  
  83.   bool isThreadLocalValue() const {
  84.     return (Flags & SymbolFlags::ThreadLocalValue) ==
  85.            SymbolFlags::ThreadLocalValue;
  86.   }
  87.  
  88.   bool isUndefined() const {
  89.     return (Flags & SymbolFlags::Undefined) == SymbolFlags::Undefined;
  90.   }
  91.  
  92.   bool isReexported() const {
  93.     return (Flags & SymbolFlags::Rexported) == SymbolFlags::Rexported;
  94.   }
  95.  
  96.   using const_target_iterator = TargetList::const_iterator;
  97.   using const_target_range = llvm::iterator_range<const_target_iterator>;
  98.   const_target_range targets() const { return {Targets}; }
  99.  
  100.   using const_filtered_target_iterator =
  101.       llvm::filter_iterator<const_target_iterator,
  102.                             std::function<bool(const Target &)>>;
  103.   using const_filtered_target_range =
  104.       llvm::iterator_range<const_filtered_target_iterator>;
  105.   const_filtered_target_range targets(ArchitectureSet architectures) const;
  106.  
  107. #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
  108.   void dump(raw_ostream &OS) const;
  109.   void dump() const { dump(llvm::errs()); }
  110. #endif
  111.  
  112.   bool operator==(const Symbol &O) const {
  113.     return std::tie(Name, Kind, Targets, Flags) ==
  114.            std::tie(O.Name, O.Kind, O.Targets, O.Flags);
  115.   }
  116.  
  117.   bool operator!=(const Symbol &O) const { return !(*this == O); }
  118.  
  119.   bool operator<(const Symbol &O) const {
  120.     return std::tie(Name, Kind, Targets, Flags) <
  121.            std::tie(O.Name, O.Kind, O.Targets, O.Flags);
  122.   }
  123.  
  124. private:
  125.   StringRef Name;
  126.   TargetList Targets;
  127.   SymbolKind Kind;
  128.   SymbolFlags Flags;
  129. };
  130.  
  131. } // end namespace MachO.
  132. } // end namespace llvm.
  133.  
  134. #endif // LLVM_TEXTAPI_SYMBOL_H
  135.