1 //===- InputSection.h -------------------------------------------*- 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 LLD_MACHO_INPUT_SECTION_H 10 #define LLD_MACHO_INPUT_SECTION_H 11 12 #include "Relocations.h" 13 14 #include "lld/Common/LLVM.h" 15 #include "llvm/ADT/ArrayRef.h" 16 #include "llvm/BinaryFormat/MachO.h" 17 18 namespace lld { 19 namespace macho { 20 21 class InputFile; 22 class InputSection; 23 class OutputSection; 24 class Symbol; 25 class Defined; 26 27 class InputSection { 28 public: 29 virtual ~InputSection() = default; 30 virtual uint64_t getSize() const { return data.size(); } 31 virtual uint64_t getFileSize() const; 32 uint64_t getFileOffset() const; 33 uint64_t getVA() const; 34 35 virtual void writeTo(uint8_t *buf); 36 37 InputFile *file = nullptr; 38 StringRef name; 39 StringRef segname; 40 41 OutputSection *parent = nullptr; 42 uint64_t outSecOff = 0; 43 uint64_t outSecFileOff = 0; 44 45 uint32_t align = 1; 46 uint32_t flags = 0; 47 48 ArrayRef<uint8_t> data; 49 std::vector<Reloc> relocs; 50 }; 51 52 inline uint8_t sectionType(uint32_t flags) { 53 return flags & llvm::MachO::SECTION_TYPE; 54 } 55 56 inline bool isZeroFill(uint32_t flags) { 57 return llvm::MachO::isVirtualSection(sectionType(flags)); 58 } 59 60 inline bool isThreadLocalVariables(uint32_t flags) { 61 return sectionType(flags) == llvm::MachO::S_THREAD_LOCAL_VARIABLES; 62 } 63 64 // These sections contain the data for initializing thread-local variables. 65 inline bool isThreadLocalData(uint32_t flags) { 66 return sectionType(flags) == llvm::MachO::S_THREAD_LOCAL_REGULAR || 67 sectionType(flags) == llvm::MachO::S_THREAD_LOCAL_ZEROFILL; 68 } 69 70 inline bool isDebugSection(uint32_t flags) { 71 return (flags & llvm::MachO::SECTION_ATTRIBUTES_USR) == 72 llvm::MachO::S_ATTR_DEBUG; 73 } 74 75 bool isCodeSection(InputSection *); 76 77 extern std::vector<InputSection *> inputSections; 78 79 namespace section_names { 80 81 constexpr const char pageZero[] = "__pagezero"; 82 constexpr const char common[] = "__common"; 83 constexpr const char header[] = "__mach_header"; 84 constexpr const char rebase[] = "__rebase"; 85 constexpr const char binding[] = "__binding"; 86 constexpr const char weakBinding[] = "__weak_binding"; 87 constexpr const char lazyBinding[] = "__lazy_binding"; 88 constexpr const char export_[] = "__export"; 89 constexpr const char functionStarts[] = "__func_starts"; 90 constexpr const char symbolTable[] = "__symbol_table"; 91 constexpr const char indirectSymbolTable[] = "__ind_sym_tab"; 92 constexpr const char stringTable[] = "__string_table"; 93 constexpr const char codeSignature[] = "__code_signature"; 94 constexpr const char got[] = "__got"; 95 constexpr const char threadPtrs[] = "__thread_ptrs"; 96 constexpr const char unwindInfo[] = "__unwind_info"; 97 constexpr const char compactUnwind[] = "__compact_unwind"; 98 constexpr const char ehFrame[] = "__eh_frame"; 99 constexpr const char text[] = "__text"; 100 constexpr const char stubs[] = "__stubs"; 101 constexpr const char stubHelper[] = "__stub_helper"; 102 constexpr const char laSymbolPtr[] = "__la_symbol_ptr"; 103 constexpr const char data[] = "__data"; 104 105 } // namespace section_names 106 107 } // namespace macho 108 109 std::string toString(const macho::InputSection *); 110 111 } // namespace lld 112 113 #endif 114