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comparison lld/MachO/InputSection.h @ 207:2e18cbf3894f

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LLVM12
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Tue, 08 Jun 2021 06:07:14 +0900
parents 0572611fdcc8
children 5f17cb93ff66
comparison
equal deleted inserted replaced
173:0572611fdcc8 207:2e18cbf3894f
7 //===----------------------------------------------------------------------===// 7 //===----------------------------------------------------------------------===//
8 8
9 #ifndef LLD_MACHO_INPUT_SECTION_H 9 #ifndef LLD_MACHO_INPUT_SECTION_H
10 #define LLD_MACHO_INPUT_SECTION_H 10 #define LLD_MACHO_INPUT_SECTION_H
11 11
12 #include "Config.h"
13 #include "Relocations.h"
14
12 #include "lld/Common/LLVM.h" 15 #include "lld/Common/LLVM.h"
13 #include "llvm/ADT/ArrayRef.h" 16 #include "llvm/ADT/ArrayRef.h"
14 #include "llvm/ADT/PointerUnion.h"
15 #include "llvm/BinaryFormat/MachO.h" 17 #include "llvm/BinaryFormat/MachO.h"
16 18
17 namespace lld { 19 namespace lld {
18 namespace macho { 20 namespace macho {
19 21
20 class InputFile; 22 class InputFile;
21 class InputSection;
22 class OutputSection; 23 class OutputSection;
23 class Symbol;
24
25 struct Reloc {
26 uint8_t type;
27 bool pcrel;
28 // The offset from the start of the subsection that this relocation belongs
29 // to.
30 uint32_t offset;
31 // Adding this offset to the address of the target symbol or subsection gives
32 // the destination that this relocation refers to.
33 uint64_t addend;
34 llvm::PointerUnion<Symbol *, InputSection *> target;
35 };
36 24
37 class InputSection { 25 class InputSection {
38 public: 26 public:
39 virtual ~InputSection() = default; 27 virtual ~InputSection() = default;
40 virtual size_t getSize() const { return data.size(); } 28 virtual uint64_t getSize() const { return data.size(); }
41 virtual uint64_t getFileSize() const { return getSize(); } 29 uint64_t getFileSize() const;
42 uint64_t getFileOffset() const; 30 uint64_t getFileOffset() const;
43 uint64_t getVA() const; 31 uint64_t getVA() const;
44 32
45 virtual void writeTo(uint8_t *buf); 33 void writeTo(uint8_t *buf);
46 34
47 InputFile *file = nullptr; 35 InputFile *file = nullptr;
48 StringRef name; 36 StringRef name;
49 StringRef segname; 37 StringRef segname;
50 38
52 uint64_t outSecOff = 0; 40 uint64_t outSecOff = 0;
53 uint64_t outSecFileOff = 0; 41 uint64_t outSecFileOff = 0;
54 42
55 uint32_t align = 1; 43 uint32_t align = 1;
56 uint32_t flags = 0; 44 uint32_t flags = 0;
45 uint32_t callSiteCount = 0;
46 bool isFinal = false; // is address assigned?
47
48 // How many symbols refer to this InputSection.
49 uint32_t numRefs = 0;
50
51 // With subsections_via_symbols, most symbols have their own InputSection,
52 // and for weak symbols (e.g. from inline functions), only the
53 // InputSection from one translation unit will make it to the output,
54 // while all copies in other translation units are coalesced into the
55 // first and not copied to the output.
56 bool wasCoalesced = false;
57
58 bool isCoalescedWeak() const { return wasCoalesced && numRefs == 0; }
59 bool shouldOmitFromOutput() const { return !live || isCoalescedWeak(); }
60
61 bool live = !config->deadStrip;
57 62
58 ArrayRef<uint8_t> data; 63 ArrayRef<uint8_t> data;
59 std::vector<Reloc> relocs; 64 std::vector<Reloc> relocs;
60 }; 65 };
61 66
67 inline uint8_t sectionType(uint32_t flags) {
68 return flags & llvm::MachO::SECTION_TYPE;
69 }
70
71 inline bool isZeroFill(uint32_t flags) {
72 return llvm::MachO::isVirtualSection(sectionType(flags));
73 }
74
75 inline bool isThreadLocalVariables(uint32_t flags) {
76 return sectionType(flags) == llvm::MachO::S_THREAD_LOCAL_VARIABLES;
77 }
78
79 // These sections contain the data for initializing thread-local variables.
80 inline bool isThreadLocalData(uint32_t flags) {
81 return sectionType(flags) == llvm::MachO::S_THREAD_LOCAL_REGULAR ||
82 sectionType(flags) == llvm::MachO::S_THREAD_LOCAL_ZEROFILL;
83 }
84
85 inline bool isDebugSection(uint32_t flags) {
86 return (flags & llvm::MachO::SECTION_ATTRIBUTES_USR) ==
87 llvm::MachO::S_ATTR_DEBUG;
88 }
89
90 bool isCodeSection(const InputSection *);
91
62 extern std::vector<InputSection *> inputSections; 92 extern std::vector<InputSection *> inputSections;
63 93
94 namespace section_names {
95
96 constexpr const char authGot[] = "__auth_got";
97 constexpr const char authPtr[] = "__auth_ptr";
98 constexpr const char binding[] = "__binding";
99 constexpr const char bitcodeBundle[] = "__bundle";
100 constexpr const char cfString[] = "__cfstring";
101 constexpr const char codeSignature[] = "__code_signature";
102 constexpr const char common[] = "__common";
103 constexpr const char compactUnwind[] = "__compact_unwind";
104 constexpr const char data[] = "__data";
105 constexpr const char debugAbbrev[] = "__debug_abbrev";
106 constexpr const char debugInfo[] = "__debug_info";
107 constexpr const char debugStr[] = "__debug_str";
108 constexpr const char ehFrame[] = "__eh_frame";
109 constexpr const char export_[] = "__export";
110 constexpr const char functionStarts[] = "__func_starts";
111 constexpr const char got[] = "__got";
112 constexpr const char header[] = "__mach_header";
113 constexpr const char indirectSymbolTable[] = "__ind_sym_tab";
114 constexpr const char const_[] = "__const";
115 constexpr const char lazySymbolPtr[] = "__la_symbol_ptr";
116 constexpr const char lazyBinding[] = "__lazy_binding";
117 constexpr const char moduleInitFunc[] = "__mod_init_func";
118 constexpr const char moduleTermFunc[] = "__mod_term_func";
119 constexpr const char nonLazySymbolPtr[] = "__nl_symbol_ptr";
120 constexpr const char objcCatList[] = "__objc_catlist";
121 constexpr const char objcClassList[] = "__objc_classlist";
122 constexpr const char objcConst[] = "__objc_const";
123 constexpr const char objcImageInfo[] = "__objc_imageinfo";
124 constexpr const char objcNonLazyCatList[] = "__objc_nlcatlist";
125 constexpr const char objcNonLazyClassList[] = "__objc_nlclslist";
126 constexpr const char objcProtoList[] = "__objc_protolist";
127 constexpr const char pageZero[] = "__pagezero";
128 constexpr const char pointers[] = "__pointers";
129 constexpr const char rebase[] = "__rebase";
130 constexpr const char staticInit[] = "__StaticInit";
131 constexpr const char stringTable[] = "__string_table";
132 constexpr const char stubHelper[] = "__stub_helper";
133 constexpr const char stubs[] = "__stubs";
134 constexpr const char swift[] = "__swift";
135 constexpr const char symbolTable[] = "__symbol_table";
136 constexpr const char textCoalNt[] = "__textcoal_nt";
137 constexpr const char text[] = "__text";
138 constexpr const char threadPtrs[] = "__thread_ptrs";
139 constexpr const char threadVars[] = "__thread_vars";
140 constexpr const char unwindInfo[] = "__unwind_info";
141 constexpr const char weakBinding[] = "__weak_binding";
142 constexpr const char zeroFill[] = "__zerofill";
143
144 } // namespace section_names
145
64 } // namespace macho 146 } // namespace macho
147
148 std::string toString(const macho::InputSection *);
149
65 } // namespace lld 150 } // namespace lld
66 151
67 #endif 152 #endif