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comparison lld/MachO/InputSection.cpp @ 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
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 // 6 //
7 //===----------------------------------------------------------------------===// 7 //===----------------------------------------------------------------------===//
8 8
9 #include "InputSection.h" 9 #include "InputSection.h"
10 #include "InputFiles.h"
10 #include "OutputSegment.h" 11 #include "OutputSegment.h"
11 #include "Symbols.h" 12 #include "Symbols.h"
13 #include "SyntheticSections.h"
12 #include "Target.h" 14 #include "Target.h"
15 #include "Writer.h"
13 #include "lld/Common/Memory.h" 16 #include "lld/Common/Memory.h"
14 #include "llvm/Support/Endian.h" 17 #include "llvm/Support/Endian.h"
15 18
19 using namespace llvm;
16 using namespace llvm::MachO; 20 using namespace llvm::MachO;
17 using namespace llvm::support; 21 using namespace llvm::support;
18 using namespace lld; 22 using namespace lld;
19 using namespace lld::macho; 23 using namespace lld::macho;
20 24
22 26
23 uint64_t InputSection::getFileOffset() const { 27 uint64_t InputSection::getFileOffset() const {
24 return parent->fileOff + outSecFileOff; 28 return parent->fileOff + outSecFileOff;
25 } 29 }
26 30
31 uint64_t InputSection::getFileSize() const {
32 return isZeroFill(flags) ? 0 : getSize();
33 }
34
27 uint64_t InputSection::getVA() const { return parent->addr + outSecOff; } 35 uint64_t InputSection::getVA() const { return parent->addr + outSecOff; }
28 36
37 static uint64_t resolveSymbolVA(const Symbol *sym, uint8_t type) {
38 const RelocAttrs &relocAttrs = target->getRelocAttrs(type);
39 if (relocAttrs.hasAttr(RelocAttrBits::BRANCH))
40 return sym->resolveBranchVA();
41 else if (relocAttrs.hasAttr(RelocAttrBits::GOT))
42 return sym->resolveGotVA();
43 else if (relocAttrs.hasAttr(RelocAttrBits::TLV))
44 return sym->resolveTlvVA();
45 return sym->getVA();
46 }
47
29 void InputSection::writeTo(uint8_t *buf) { 48 void InputSection::writeTo(uint8_t *buf) {
30 if (!data.empty()) 49 assert(!shouldOmitFromOutput());
31 memcpy(buf, data.data(), data.size());
32 50
33 for (Reloc &r : relocs) { 51 if (getFileSize() == 0)
34 uint64_t va = 0; 52 return;
35 if (auto *s = r.target.dyn_cast<Symbol *>()) { 53
36 if (auto *dylibSymbol = dyn_cast<DylibSymbol>(s)) { 54 memcpy(buf, data.data(), data.size());
37 va = target->getDylibSymbolVA(*dylibSymbol, r.type); 55
38 } else { 56 for (size_t i = 0; i < relocs.size(); i++) {
39 va = s->getVA(); 57 const Reloc &r = relocs[i];
58 uint8_t *loc = buf + r.offset;
59 uint64_t referentVA = 0;
60 if (target->hasAttr(r.type, RelocAttrBits::SUBTRAHEND)) {
61 const Symbol *fromSym = r.referent.get<Symbol *>();
62 const Reloc &minuend = relocs[++i];
63 uint64_t minuendVA;
64 if (const Symbol *toSym = minuend.referent.dyn_cast<Symbol *>())
65 minuendVA = toSym->getVA();
66 else {
67 auto *referentIsec = minuend.referent.get<InputSection *>();
68 assert(!referentIsec->shouldOmitFromOutput());
69 minuendVA = referentIsec->getVA();
40 } 70 }
41 } else if (auto *isec = r.target.dyn_cast<InputSection *>()) { 71 referentVA = minuendVA - fromSym->getVA() + minuend.addend;
42 va = isec->getVA(); 72 } else if (auto *referentSym = r.referent.dyn_cast<Symbol *>()) {
73 if (target->hasAttr(r.type, RelocAttrBits::LOAD) &&
74 !referentSym->isInGot())
75 target->relaxGotLoad(loc, r.type);
76 referentVA = resolveSymbolVA(referentSym, r.type);
77
78 if (isThreadLocalVariables(flags)) {
79 // References from thread-local variable sections are treated as offsets
80 // relative to the start of the thread-local data memory area, which
81 // is initialized via copying all the TLV data sections (which are all
82 // contiguous).
83 if (isa<Defined>(referentSym))
84 referentVA -= firstTLVDataSection->addr;
85 }
86 } else if (auto *referentIsec = r.referent.dyn_cast<InputSection *>()) {
87 assert(!referentIsec->shouldOmitFromOutput());
88 referentVA = referentIsec->getVA();
43 } 89 }
44 90 target->relocateOne(loc, r, referentVA + r.addend, getVA() + r.offset);
45 uint64_t val = va + r.addend;
46 if (r.pcrel)
47 val -= getVA() + r.offset;
48 target->relocateOne(buf + r.offset, r.type, val);
49 } 91 }
50 } 92 }
93
94 bool macho::isCodeSection(const InputSection *isec) {
95 uint32_t type = isec->flags & SECTION_TYPE;
96 if (type != S_REGULAR && type != S_COALESCED)
97 return false;
98
99 uint32_t attr = isec->flags & SECTION_ATTRIBUTES_USR;
100 if (attr == S_ATTR_PURE_INSTRUCTIONS)
101 return true;
102
103 if (isec->segname == segment_names::text)
104 return StringSwitch<bool>(isec->name)
105 .Cases(section_names::textCoalNt, section_names::staticInit, true)
106 .Default(false);
107
108 return false;
109 }
110
111 std::string lld::toString(const InputSection *isec) {
112 return (toString(isec->file) + ":(" + isec->name + ")").str();
113 }