Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 1 | //===- lib/ReaderWriter/ELF/ReaderELF.cpp --------------------------------===// |
| 2 | // |
| 3 | // The LLVM Linker |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 9 | // |
| 10 | // This file contains the ELF Reader and all helper sub classes |
| 11 | // to consume an ELF file and produces atoms out of it. |
| 12 | // |
| 13 | //===----------------------------------------------------------------------===// |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 14 | |
| 15 | #include "lld/ReaderWriter/ReaderELF.h" |
| 16 | #include "lld/Core/File.h" |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 17 | #include "lld/Core/Reference.h" |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 18 | |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 19 | #include "llvm/ADT/ArrayRef.h" |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 20 | #include "llvm/ADT/SmallString.h" |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 21 | #include "llvm/ADT/StringRef.h" |
| 22 | #include "llvm/Object/ELF.h" |
| 23 | #include "llvm/Object/ObjectFile.h" |
| 24 | #include "llvm/Support/Allocator.h" |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 25 | #include "llvm/Support/Casting.h" |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 26 | #include "llvm/Support/ELF.h" |
| 27 | #include "llvm/Support/Endian.h" |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 28 | #include "llvm/Support/ErrorHandling.h" |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 29 | #include "llvm/Support/MathExtras.h" |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 30 | #include "llvm/Support/Memory.h" |
| 31 | #include "llvm/Support/MemoryBuffer.h" |
| 32 | #include "llvm/Support/raw_ostream.h" |
| 33 | #include "llvm/Support/system_error.h" |
| 34 | |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 35 | |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 36 | #include <map> |
| 37 | #include <vector> |
| 38 | |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 39 | using llvm::object::Elf_Sym_Impl; |
| 40 | using namespace lld; |
| 41 | |
| 42 | namespace { // anonymous |
| 43 | |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 44 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 45 | /// \brief Relocation References: Defined Atoms may contain |
| 46 | /// references that will need to be patched before |
| 47 | /// the executable is written. |
| 48 | template <llvm::support::endianness target_endianness, bool is64Bits> |
| 49 | class ELFReference final : public Reference { |
| 50 | |
| 51 | typedef llvm::object::Elf_Rel_Impl |
| 52 | <target_endianness, is64Bits, false> Elf_Rel; |
| 53 | typedef llvm::object::Elf_Rel_Impl |
| 54 | <target_endianness, is64Bits, true> Elf_Rela; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 55 | public: |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 56 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 57 | ELFReference(const Elf_Rela *rela, uint64_t offset, const Atom *target) |
| 58 | : _target(target) |
| 59 | , _targetSymbolIndex(rela->getSymbol()) |
| 60 | , _offsetInAtom(offset) |
| 61 | , _addend(rela->r_addend) |
| 62 | , _kind(rela->getType()) {} |
| 63 | |
| 64 | ELFReference(const Elf_Rel *rel, uint64_t offset, const Atom *target) |
| 65 | : _target(target) |
| 66 | , _targetSymbolIndex(rel->getSymbol()) |
| 67 | , _offsetInAtom(offset) |
| 68 | , _addend(0) |
| 69 | , _kind(rel->getType()) {} |
| 70 | |
| 71 | |
| 72 | virtual uint64_t offsetInAtom() const { |
| 73 | return _offsetInAtom; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 74 | } |
| 75 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 76 | virtual Kind kind() const { |
| 77 | return _kind; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 78 | } |
| 79 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 80 | virtual void setKind(Kind kind) { |
| 81 | _kind = kind; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 82 | } |
| 83 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 84 | virtual const Atom *target() const { |
| 85 | return _target; |
| 86 | } |
| 87 | |
| 88 | /// \brief targetSymbolIndex: This is the symbol table index that contains |
| 89 | /// the target reference. |
| 90 | uint64_t targetSymbolIndex() const { |
| 91 | return _targetSymbolIndex; |
| 92 | } |
| 93 | |
| 94 | virtual Addend addend() const { |
| 95 | return _addend; |
| 96 | } |
| 97 | |
| 98 | virtual void setAddend(Addend A) { |
| 99 | _addend = A; |
| 100 | } |
| 101 | |
| 102 | virtual void setTarget(const Atom *newAtom) { |
| 103 | _target = newAtom; |
| 104 | } |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 105 | private: |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 106 | const Atom *_target; |
| 107 | uint64_t _targetSymbolIndex; |
| 108 | uint64_t _offsetInAtom; |
| 109 | Addend _addend; |
| 110 | Kind _kind; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 111 | }; |
| 112 | |
| 113 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 114 | /// \brief ELFAbsoluteAtom: These atoms store symbols that are fixed to a |
| 115 | /// particular address. This atom has no content its address will be used by |
| 116 | /// the writer to fixup references that point to it. |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 117 | template<llvm::support::endianness target_endianness, bool is64Bits> |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 118 | class ELFAbsoluteAtom final: public AbsoluteAtom { |
| 119 | |
| 120 | public: |
| 121 | ELFAbsoluteAtom(const File &file, |
| 122 | llvm::StringRef name, |
| 123 | uint64_t value) |
| 124 | : _owningFile(file) |
| 125 | , _name(name) |
| 126 | , _value(value) |
| 127 | {} |
| 128 | |
| 129 | virtual const class File &file() const { |
| 130 | return _owningFile; |
| 131 | } |
| 132 | |
| 133 | virtual llvm::StringRef name() const { |
| 134 | return _name; |
| 135 | } |
| 136 | |
| 137 | virtual uint64_t value() const { |
| 138 | return _value; |
| 139 | } |
| 140 | |
| 141 | private: |
| 142 | const File &_owningFile; |
| 143 | llvm::StringRef _name; |
| 144 | uint64_t _value; |
| 145 | }; |
| 146 | |
| 147 | |
| 148 | /// \brief ELFUndefinedAtom: These atoms store undefined symbols and are |
| 149 | /// place holders that will be replaced by defined atoms later in the |
| 150 | /// linking process. |
| 151 | template<llvm::support::endianness target_endianness, bool is64Bits> |
| 152 | class ELFUndefinedAtom final: public UndefinedAtom { |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 153 | |
| 154 | typedef llvm::object::Elf_Sym_Impl<target_endianness, is64Bits> Elf_Sym; |
| 155 | |
| 156 | public: |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 157 | ELFUndefinedAtom(const File &file, |
| 158 | llvm::StringRef name, |
| 159 | const Elf_Sym *symbol) |
| 160 | : _owningFile(file) |
| 161 | , _name(name) |
| 162 | , _symbol(symbol) |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 163 | {} |
| 164 | |
| 165 | virtual const class File &file() const { |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 166 | return _owningFile; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | virtual llvm::StringRef name() const { |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 170 | return _name; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | // FIXME What distinguishes a symbol in ELF that can help |
| 174 | // decide if the symbol is undefined only during build and not |
| 175 | // runtime? This will make us choose canBeNullAtBuildtime and |
| 176 | // canBeNullAtRuntime |
| 177 | // |
| 178 | virtual CanBeNull canBeNull() const { |
| 179 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 180 | if (_symbol->getBinding() == llvm::ELF::STB_WEAK) |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 181 | return CanBeNull::canBeNullAtBuildtime; |
| 182 | else |
| 183 | return CanBeNull::canBeNullNever; |
| 184 | } |
| 185 | |
| 186 | private: |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 187 | const File &_owningFile; |
| 188 | llvm::StringRef _name; |
| 189 | const Elf_Sym *_symbol; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 190 | }; |
| 191 | |
| 192 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 193 | /// \brief ELFDefinedAtom: This atom stores defined symbols and will contain |
| 194 | /// either data or code. |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 195 | template<llvm::support::endianness target_endianness, bool is64Bits> |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 196 | class ELFDefinedAtom final: public DefinedAtom { |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 197 | |
| 198 | typedef llvm::object::Elf_Sym_Impl<target_endianness, is64Bits> Elf_Sym; |
| 199 | typedef llvm::object::Elf_Shdr_Impl<target_endianness, is64Bits> Elf_Shdr; |
| 200 | |
| 201 | public: |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 202 | ELFDefinedAtom(const File &file, |
| 203 | llvm::StringRef symbolName, |
| 204 | llvm::StringRef sectionName, |
| 205 | const Elf_Sym *symbol, |
| 206 | const Elf_Shdr *section, |
| 207 | llvm::ArrayRef<uint8_t> contentData, |
| 208 | unsigned int referenceStart, |
| 209 | unsigned int referenceEnd, |
| 210 | std::vector<ELFReference |
| 211 | <target_endianness, is64Bits> *> &referenceList) |
| 212 | |
| 213 | : _owningFile(file) |
| 214 | , _symbolName(symbolName) |
| 215 | , _sectionName(sectionName) |
| 216 | , _symbol(symbol) |
| 217 | , _section(section) |
| 218 | , _contentData(contentData) |
| 219 | , _referenceStartIndex(referenceStart) |
| 220 | , _referenceEndIndex(referenceEnd) |
| 221 | , _referenceList(referenceList) { |
| 222 | static uint64_t orderNumber = 0; |
| 223 | _ordinal = ++orderNumber; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 224 | } |
| 225 | |
| 226 | virtual const class File &file() const { |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 227 | return _owningFile; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 228 | } |
| 229 | |
| 230 | virtual llvm::StringRef name() const { |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 231 | return _symbolName; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | virtual uint64_t ordinal() const { |
| 235 | return _ordinal; |
| 236 | } |
| 237 | |
| 238 | virtual uint64_t size() const { |
| 239 | |
| 240 | // Common symbols are not allocated in object files so |
| 241 | // their size is zero. |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 242 | if ((_symbol->getType() == llvm::ELF::STT_COMMON) |
| 243 | || _symbol->st_shndx == llvm::ELF::SHN_COMMON) |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 244 | return (uint64_t)0; |
| 245 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 246 | return _contentData.size(); |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 247 | |
| 248 | } |
| 249 | |
| 250 | virtual Scope scope() const { |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 251 | if (_symbol->st_other == llvm::ELF::STV_HIDDEN) |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 252 | return scopeLinkageUnit; |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 253 | else if (_symbol->getBinding() != llvm::ELF::STB_LOCAL) |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 254 | return scopeGlobal; |
| 255 | else |
| 256 | return scopeTranslationUnit; |
| 257 | } |
| 258 | |
| 259 | // FIXME Need to revisit this in future. |
| 260 | |
| 261 | virtual Interposable interposable() const { |
| 262 | return interposeNo; |
| 263 | } |
| 264 | |
| 265 | // FIXME What ways can we determine this in ELF? |
| 266 | |
| 267 | virtual Merge merge() const { |
| 268 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 269 | if (_symbol->getBinding() == llvm::ELF::STB_WEAK) |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 270 | return mergeAsWeak; |
| 271 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 272 | if ((_symbol->getType() == llvm::ELF::STT_COMMON) |
| 273 | || _symbol->st_shndx == llvm::ELF::SHN_COMMON) |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 274 | return mergeAsTentative; |
| 275 | |
| 276 | return mergeNo; |
| 277 | } |
| 278 | |
| 279 | virtual ContentType contentType() const { |
| 280 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 281 | if (_symbol->getType() == llvm::ELF::STT_FUNC) |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 282 | return typeCode; |
| 283 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 284 | if ((_symbol->getType() == llvm::ELF::STT_COMMON) |
| 285 | || _symbol->st_shndx == llvm::ELF::SHN_COMMON) |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 286 | return typeZeroFill; |
| 287 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 288 | if (_symbol->getType() == llvm::ELF::STT_OBJECT) |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 289 | return typeData; |
| 290 | |
| 291 | return typeUnknown; |
| 292 | } |
| 293 | |
| 294 | virtual Alignment alignment() const { |
| 295 | |
| 296 | // Unallocated common symbols specify their alignment |
| 297 | // constraints in st_value. |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 298 | if ((_symbol->getType() == llvm::ELF::STT_COMMON) |
| 299 | || _symbol->st_shndx == llvm::ELF::SHN_COMMON) { |
| 300 | return (Alignment(_symbol->st_value)); |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 301 | } |
| 302 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 303 | return Alignment(llvm::Log2_64(_section->sh_addralign)); |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 304 | } |
| 305 | |
| 306 | // Do we have a choice for ELF? All symbols |
| 307 | // live in explicit sections. |
| 308 | virtual SectionChoice sectionChoice() const { |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 309 | if (_symbol->st_shndx > llvm::ELF::SHN_LORESERVE) |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 310 | return sectionBasedOnContent; |
| 311 | |
| 312 | return sectionCustomRequired; |
| 313 | } |
| 314 | |
| 315 | virtual llvm::StringRef customSectionName() const { |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 316 | return _sectionName; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 317 | } |
| 318 | |
| 319 | // It isn't clear that __attribute__((used)) is transmitted to |
| 320 | // the ELF object file. |
| 321 | virtual DeadStripKind deadStrip() const { |
| 322 | return deadStripNormal; |
| 323 | } |
| 324 | |
| 325 | virtual ContentPermissions permissions() const { |
| 326 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 327 | switch (_section->sh_type) { |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 328 | // permRW_L is for sections modified by the runtime |
| 329 | // loader. |
| 330 | case llvm::ELF::SHT_REL: |
| 331 | case llvm::ELF::SHT_RELA: |
| 332 | return permRW_L; |
| 333 | |
| 334 | case llvm::ELF::SHT_DYNAMIC: |
| 335 | case llvm::ELF::SHT_PROGBITS: |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 336 | switch (_section->sh_flags) { |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 337 | |
| 338 | case (llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_EXECINSTR): |
| 339 | return permR_X; |
| 340 | |
| 341 | case (llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_WRITE): |
| 342 | return permRW_; |
| 343 | |
| 344 | case llvm::ELF::SHF_ALLOC: |
| 345 | case (llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_MERGE): |
| 346 | case (llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_MERGE |
| 347 | | llvm::ELF::SHF_STRINGS): |
| 348 | return permR__; |
| 349 | } |
| 350 | default: |
| 351 | return perm___; |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | // Many non ARM architectures use ELF file format |
| 356 | // This not really a place to put a architecture |
| 357 | // specific method in an atom. A better approach is |
| 358 | // needed. |
| 359 | // |
| 360 | virtual bool isThumb() const { |
| 361 | return false; |
| 362 | } |
| 363 | |
| 364 | // FIXME Not Sure if ELF supports alias atoms. Find out more. |
| 365 | virtual bool isAlias() const { |
| 366 | return false; |
| 367 | } |
| 368 | |
| 369 | virtual llvm::ArrayRef<uint8_t> rawContent() const { |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 370 | return _contentData; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 371 | } |
| 372 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 373 | DefinedAtom::reference_iterator begin() const { |
| 374 | uintptr_t index = _referenceStartIndex; |
| 375 | const void *it = reinterpret_cast<const void*>(index); |
| 376 | return reference_iterator(*this, it); |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 377 | } |
| 378 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 379 | DefinedAtom::reference_iterator end() const { |
| 380 | uintptr_t index = _referenceEndIndex; |
| 381 | const void *it = reinterpret_cast<const void*>(index); |
| 382 | return reference_iterator(*this, it); |
| 383 | } |
| 384 | |
| 385 | const Reference *derefIterator(const void *It) const { |
| 386 | uintptr_t index = reinterpret_cast<uintptr_t>(It); |
| 387 | assert(index >= _referenceStartIndex); |
| 388 | assert(index < _referenceEndIndex); |
| 389 | return ((_referenceList)[index]); |
| 390 | } |
| 391 | |
| 392 | void incrementIterator(const void*& It) const { |
| 393 | uintptr_t index = reinterpret_cast<uintptr_t>(It); |
| 394 | ++index; |
| 395 | It = reinterpret_cast<const void*>(index); |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 396 | } |
| 397 | |
| 398 | private: |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 399 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 400 | const File &_owningFile; |
| 401 | llvm::StringRef _symbolName; |
| 402 | llvm::StringRef _sectionName; |
| 403 | const Elf_Sym *_symbol; |
| 404 | const Elf_Shdr *_section; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 405 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 406 | // _contentData will hold the bits that make up the atom. |
| 407 | llvm::ArrayRef<uint8_t> _contentData; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 408 | |
| 409 | uint64_t _ordinal; |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 410 | unsigned int _referenceStartIndex; |
| 411 | unsigned int _referenceEndIndex; |
| 412 | std::vector<ELFReference<target_endianness, is64Bits> *> &_referenceList; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 413 | }; |
| 414 | |
| 415 | |
| 416 | // FileELF will read a binary, find out based on the symbol table contents |
| 417 | // what kind of symbol it is and create corresponding atoms for it |
| 418 | |
| 419 | template<llvm::support::endianness target_endianness, bool is64Bits> |
| 420 | class FileELF: public File { |
| 421 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 422 | typedef llvm::object::Elf_Sym_Impl |
| 423 | <target_endianness, is64Bits> Elf_Sym; |
| 424 | typedef llvm::object::Elf_Shdr_Impl |
| 425 | <target_endianness, is64Bits> Elf_Shdr; |
| 426 | typedef llvm::object::Elf_Rel_Impl |
| 427 | <target_endianness, is64Bits, false> Elf_Rel; |
| 428 | typedef llvm::object::Elf_Rel_Impl |
| 429 | <target_endianness, is64Bits, true> Elf_Rela; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 430 | |
| 431 | public: |
| 432 | FileELF(std::unique_ptr<llvm::MemoryBuffer> MB, llvm::error_code &EC) : |
| 433 | File(MB->getBufferIdentifier()) { |
| 434 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 435 | llvm::OwningPtr<llvm::object::Binary> binaryFile; |
| 436 | EC = llvm::object::createBinary(MB.release(), binaryFile); |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 437 | if (EC) |
| 438 | return; |
| 439 | |
| 440 | // Point Obj to correct class and bitwidth ELF object |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 441 | _objFile.reset(llvm::dyn_cast<llvm::object::ELFObjectFile<target_endianness, |
| 442 | is64Bits> >(binaryFile.get())); |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 443 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 444 | if (!_objFile) { |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 445 | EC = make_error_code(llvm::object::object_error::invalid_file_type); |
| 446 | return; |
| 447 | } |
| 448 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 449 | binaryFile.take(); |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 450 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 451 | std::map< const Elf_Shdr *, std::vector<const Elf_Sym *>> sectionSymbols; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 452 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 453 | // Handle: SHT_REL and SHT_RELA sections: |
| 454 | // Increment over the sections, when REL/RELA section types are |
| 455 | // found add the contents to the RelocationReferences map. |
| 456 | |
| 457 | llvm::object::section_iterator sit(_objFile->begin_sections()); |
| 458 | llvm::object::section_iterator sie(_objFile->end_sections()); |
| 459 | for (; sit != sie; sit.increment(EC)) { |
| 460 | if (EC) |
| 461 | return; |
| 462 | |
| 463 | const Elf_Shdr *section = _objFile->getElfSection(sit); |
| 464 | |
| 465 | if (section->sh_type == llvm::ELF::SHT_RELA) { |
| 466 | llvm::StringRef sectionName; |
| 467 | if ((EC = _objFile->getSectionName(section, sectionName))) |
| 468 | return; |
| 469 | // Get rid of the leading .rela so Atoms can use their own section |
| 470 | // name to find the relocs. |
| 471 | sectionName = sectionName.drop_front(5); |
| 472 | |
| 473 | auto rai(_objFile->beginELFRela(section)); |
| 474 | auto rae(_objFile->endELFRela(section)); |
| 475 | |
| 476 | auto &Ref = _relocationAddendRefences[sectionName]; |
| 477 | for (; rai != rae; rai++) { |
| 478 | Ref.push_back(&*rai); |
| 479 | } |
| 480 | } |
| 481 | |
| 482 | if (section->sh_type == llvm::ELF::SHT_REL) { |
| 483 | llvm::StringRef sectionName; |
| 484 | if ((EC = _objFile->getSectionName(section, sectionName))) |
| 485 | return; |
| 486 | // Get rid of the leading .rel so Atoms can use their own section |
| 487 | // name to find the relocs. |
| 488 | sectionName = sectionName.drop_front(4); |
| 489 | |
| 490 | auto ri(_objFile->beginELFRel(section)); |
| 491 | auto re(_objFile->endELFRel(section)); |
| 492 | |
| 493 | auto &Ref = _relocationReferences[sectionName]; |
| 494 | for (; ri != re; ri++) { |
| 495 | Ref.push_back(&*ri); |
| 496 | } |
| 497 | } |
| 498 | } |
| 499 | |
| 500 | |
| 501 | // Increment over all the symbols collecting atoms and symbol |
| 502 | // names for later use. |
| 503 | |
| 504 | llvm::object::symbol_iterator it(_objFile->begin_symbols()); |
| 505 | llvm::object::symbol_iterator ie(_objFile->end_symbols()); |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 506 | |
Sid Manning | 429a4bc | 2012-07-27 14:52:18 +0000 | [diff] [blame] | 507 | for (; it != ie; it.increment(EC)) { |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 508 | if (EC) |
Sid Manning | 429a4bc | 2012-07-27 14:52:18 +0000 | [diff] [blame] | 509 | return; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 510 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 511 | if ((EC = it->getSection(sit))) |
Sid Manning | 429a4bc | 2012-07-27 14:52:18 +0000 | [diff] [blame] | 512 | return; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 513 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 514 | const Elf_Shdr *section = _objFile->getElfSection(sit); |
| 515 | const Elf_Sym *symbol = _objFile->getElfSymbol(it); |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 516 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 517 | llvm::StringRef symbolName; |
| 518 | if ((EC = _objFile->getSymbolName(section, symbol, symbolName))) |
Sid Manning | 429a4bc | 2012-07-27 14:52:18 +0000 | [diff] [blame] | 519 | return; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 520 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 521 | if (symbol->st_shndx == llvm::ELF::SHN_ABS) { |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 522 | // Create an absolute atom. |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 523 | auto *newAtom = new (_readerStorage.Allocate |
| 524 | <ELFAbsoluteAtom<target_endianness, is64Bits> > ()) |
| 525 | ELFAbsoluteAtom<target_endianness, is64Bits> |
| 526 | (*this, symbolName, symbol->st_value); |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 527 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 528 | _absoluteAtoms._atoms.push_back(newAtom); |
| 529 | _symbolToAtomMapping.insert(std::make_pair(symbol, newAtom)); |
| 530 | |
| 531 | } else if (symbol->st_shndx == llvm::ELF::SHN_UNDEF) { |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 532 | // Create an undefined atom. |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 533 | auto *newAtom = new (_readerStorage.Allocate |
| 534 | <ELFUndefinedAtom<target_endianness, is64Bits> > ()) |
| 535 | ELFUndefinedAtom<target_endianness, is64Bits> |
| 536 | (*this, symbolName, symbol); |
| 537 | |
| 538 | _undefinedAtoms._atoms.push_back(newAtom); |
| 539 | _symbolToAtomMapping.insert(std::make_pair(symbol, newAtom)); |
| 540 | |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 541 | } else { |
| 542 | // This is actually a defined symbol. Add it to its section's list of |
| 543 | // symbols. |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 544 | if (symbol->getType() == llvm::ELF::STT_NOTYPE |
| 545 | || symbol->getType() == llvm::ELF::STT_OBJECT |
| 546 | || symbol->getType() == llvm::ELF::STT_FUNC |
| 547 | || symbol->getType() == llvm::ELF::STT_SECTION |
| 548 | || symbol->getType() == llvm::ELF::STT_FILE |
| 549 | || symbol->getType() == llvm::ELF::STT_TLS |
| 550 | || symbol->getType() == llvm::ELF::STT_COMMON |
| 551 | || symbol->st_shndx == llvm::ELF::SHN_COMMON) { |
| 552 | sectionSymbols[section].push_back(symbol); |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 553 | } |
| 554 | else { |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 555 | llvm::errs() << "Unable to create atom for: " << symbolName << "\n"; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 556 | EC = llvm::object::object_error::parse_failed; |
| 557 | return; |
| 558 | } |
| 559 | } |
| 560 | } |
| 561 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 562 | for (auto &i : sectionSymbols) { |
| 563 | auto &symbols = i.second; |
| 564 | llvm::StringRef symbolName; |
| 565 | llvm::StringRef sectionName; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 566 | // Sort symbols by position. |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 567 | std::stable_sort(symbols.begin(), symbols.end(), |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 568 | // From ReaderCOFF.cpp: |
| 569 | // For some reason MSVC fails to allow the lambda in this context with |
| 570 | // a "illegal use of local type in type instantiation". MSVC is clearly |
| 571 | // wrong here. Force a conversion to function pointer to work around. |
| 572 | static_cast<bool(*)(const Elf_Sym*, const Elf_Sym*)>( |
| 573 | [](const Elf_Sym *A, const Elf_Sym *B) -> bool { |
| 574 | return A->st_value < B->st_value; |
| 575 | })); |
| 576 | |
| 577 | // i.first is the section the symbol lives in |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 578 | for (auto si = symbols.begin(), se = symbols.end(); si != se; ++si) { |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 579 | |
| 580 | StringRef symbolContents; |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 581 | if ((EC = _objFile->getSectionContents(i.first, symbolContents))) |
Sid Manning | 429a4bc | 2012-07-27 14:52:18 +0000 | [diff] [blame] | 582 | return; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 583 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 584 | if ((EC = _objFile->getSymbolName(i.first, *si, symbolName))) |
Sid Manning | 429a4bc | 2012-07-27 14:52:18 +0000 | [diff] [blame] | 585 | return; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 586 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 587 | if ((EC = _objFile->getSectionName(i.first, sectionName))) |
Sid Manning | 429a4bc | 2012-07-27 14:52:18 +0000 | [diff] [blame] | 588 | return; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 589 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 590 | bool isCommon = false; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 591 | if (((*si)->getType() == llvm::ELF::STT_COMMON) |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 592 | || (*si)->st_shndx == llvm::ELF::SHN_COMMON) |
| 593 | isCommon = true; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 594 | |
| 595 | // Get the symbol's content: |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 596 | llvm::ArrayRef<uint8_t> symbolData; |
| 597 | uint64_t contentSize; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 598 | if (si + 1 == se) { |
| 599 | // if this is the last symbol, take up the remaining data. |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 600 | contentSize = (isCommon) ? 0 |
| 601 | : ((i.first)->sh_size - (*si)->st_value); |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 602 | } |
| 603 | else { |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 604 | contentSize = (isCommon) ? 0 |
| 605 | : (*(si + 1))->st_value - (*si)->st_value; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 606 | } |
| 607 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 608 | symbolData = llvm::ArrayRef<uint8_t>((uint8_t *)symbolContents.data() |
| 609 | + (*si)->st_value, contentSize); |
| 610 | |
| 611 | |
| 612 | unsigned int referenceStart = _references.size(); |
| 613 | |
| 614 | // Only relocations that are inside the domain of the atom are |
| 615 | // added. |
| 616 | |
| 617 | // Add Rela (those with r_addend) references: |
| 618 | for (auto &rai : _relocationAddendRefences[sectionName]) { |
| 619 | if ((rai->r_offset >= (*si)->st_value) && |
| 620 | (rai->r_offset < (*si)->st_value+contentSize)) { |
| 621 | |
| 622 | auto *ERef = new (_readerStorage.Allocate |
| 623 | <ELFReference<target_endianness, is64Bits> > ()) |
| 624 | ELFReference<target_endianness, is64Bits> ( |
| 625 | rai, rai->r_offset-(*si)->st_value, nullptr); |
| 626 | |
| 627 | _references.push_back(ERef); |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | // Add Rel references: |
| 632 | for (auto &ri : _relocationReferences[sectionName]) { |
| 633 | if (((ri)->r_offset >= (*si)->st_value) && |
| 634 | ((ri)->r_offset < (*si)->st_value+contentSize)) { |
| 635 | |
| 636 | auto *ERef = new (_readerStorage.Allocate |
| 637 | <ELFReference<target_endianness, is64Bits> > ()) |
| 638 | ELFReference<target_endianness, is64Bits> ( |
| 639 | (ri), (ri)->r_offset-(*si)->st_value, nullptr); |
| 640 | |
| 641 | _references.push_back(ERef); |
| 642 | } |
| 643 | } |
| 644 | |
| 645 | // Create the DefinedAtom and add it to the list of DefinedAtoms. |
| 646 | auto *newAtom = new (_readerStorage.Allocate |
| 647 | <ELFDefinedAtom<target_endianness, is64Bits> > ()) |
| 648 | ELFDefinedAtom<target_endianness, is64Bits> |
| 649 | (*this, symbolName, sectionName, |
| 650 | *si, i.first, symbolData, |
| 651 | referenceStart, _references.size(), _references); |
| 652 | |
| 653 | _definedAtoms._atoms.push_back(newAtom); |
| 654 | _symbolToAtomMapping.insert(std::make_pair((*si), newAtom)); |
| 655 | |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 656 | } |
| 657 | } |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 658 | |
| 659 | // All the Atoms and References are created. Now update each Reference's |
| 660 | // target with the Atom pointer it refers to. |
| 661 | for (auto &ri : _references) { |
| 662 | const Elf_Sym *Symbol = _objFile->getElfSymbol(ri->targetSymbolIndex()); |
| 663 | ri->setTarget(findAtom (Symbol)); |
| 664 | } |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 665 | } |
| 666 | |
| 667 | virtual void addAtom(const Atom&) { |
| 668 | llvm_unreachable("cannot add atoms to native .o files"); |
| 669 | } |
| 670 | |
| 671 | virtual const atom_collection<DefinedAtom> &defined() const { |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 672 | return _definedAtoms; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 673 | } |
| 674 | |
| 675 | virtual const atom_collection<UndefinedAtom> &undefined() const { |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 676 | return _undefinedAtoms; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 677 | } |
| 678 | |
| 679 | virtual const atom_collection<SharedLibraryAtom> &sharedLibrary() const { |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 680 | return _sharedLibraryAtoms; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 681 | } |
| 682 | |
| 683 | virtual const atom_collection<AbsoluteAtom> &absolute() const { |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 684 | return _absoluteAtoms; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 685 | } |
| 686 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 687 | Atom *findAtom(const Elf_Sym *symbol) { |
| 688 | return (_symbolToAtomMapping.lookup(symbol)); |
| 689 | } |
| 690 | |
| 691 | |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 692 | private: |
| 693 | std::unique_ptr<llvm::object::ELFObjectFile<target_endianness, is64Bits> > |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 694 | _objFile; |
| 695 | atom_collection_vector<DefinedAtom> _definedAtoms; |
| 696 | atom_collection_vector<UndefinedAtom> _undefinedAtoms; |
| 697 | atom_collection_vector<SharedLibraryAtom> _sharedLibraryAtoms; |
| 698 | atom_collection_vector<AbsoluteAtom> _absoluteAtoms; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 699 | |
Sid Manning | 8caf4de | 2012-09-17 12:49:38 +0000 | [diff] [blame^] | 700 | /// \brief _relocationAddendRefences and _relocationReferences contain the list |
| 701 | /// of relocations references. In ELF, if a section named, ".text" has |
| 702 | /// relocations will also have a section named ".rel.text" or ".rela.text" |
| 703 | /// which will hold the entries. -- .rel or .rela is prepended to create |
| 704 | /// the SHT_REL(A) section name. |
| 705 | /// |
| 706 | std::map<llvm::StringRef, std::vector<const Elf_Rela *> > |
| 707 | _relocationAddendRefences; |
| 708 | std::map<llvm::StringRef, std::vector<const Elf_Rel *> > |
| 709 | _relocationReferences; |
| 710 | |
| 711 | std::vector<ELFReference<target_endianness, is64Bits> *> _references; |
| 712 | llvm::DenseMap<const Elf_Sym *, Atom *> _symbolToAtomMapping; |
| 713 | |
| 714 | llvm::BumpPtrAllocator _readerStorage; |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 715 | }; |
| 716 | |
| 717 | // ReaderELF is reader object that will instantiate correct FileELF |
| 718 | // by examining the memory buffer for ELF class and bitwidth |
| 719 | |
| 720 | class ReaderELF: public Reader { |
| 721 | public: |
Michael J. Spencer | 69ed53a | 2012-09-10 23:46:58 +0000 | [diff] [blame] | 722 | ReaderELF(const ReaderOptionsELF &) {} |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 723 | error_code parseFile(std::unique_ptr<MemoryBuffer> mb, std::vector< |
| 724 | std::unique_ptr<File> > &result) { |
| 725 | |
| 726 | std::pair<unsigned char, unsigned char> Ident = |
| 727 | llvm::object::getElfArchType(&*mb); |
| 728 | llvm::error_code ec; |
| 729 | // Instantiate the correct FileELF template instance |
| 730 | // based on the Ident pair. Once the File is created |
| 731 | // we push the file to the vector of files already |
| 732 | // created during parser's life. |
| 733 | |
| 734 | std::unique_ptr<File> f; |
| 735 | |
| 736 | if (Ident.first == llvm::ELF::ELFCLASS32 && Ident.second |
| 737 | == llvm::ELF::ELFDATA2LSB) { |
| 738 | f.reset(new FileELF<llvm::support::little, false>(std::move(mb), ec)); |
| 739 | |
| 740 | } else if (Ident.first == llvm::ELF::ELFCLASS32 && Ident.second |
| 741 | == llvm::ELF::ELFDATA2MSB) { |
| 742 | f.reset(new FileELF<llvm::support::big, false> (std::move(mb), ec)); |
| 743 | |
| 744 | } else if (Ident.first == llvm::ELF::ELFCLASS64 && Ident.second |
| 745 | == llvm::ELF::ELFDATA2MSB) { |
| 746 | f.reset(new FileELF<llvm::support::big, true> (std::move(mb), ec)); |
| 747 | |
| 748 | } else if (Ident.first == llvm::ELF::ELFCLASS64 && Ident.second |
| 749 | == llvm::ELF::ELFDATA2LSB) { |
| 750 | f.reset(new FileELF<llvm::support::little, true> (std::move(mb), ec)); |
| 751 | } |
| 752 | |
| 753 | if (ec) |
| 754 | return ec; |
| 755 | |
| 756 | result.push_back(std::move(f)); |
| 757 | return error_code::success(); |
| 758 | } |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 759 | }; |
| 760 | |
| 761 | } // namespace anonymous |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 762 | |
| 763 | namespace lld { |
| 764 | |
| 765 | ReaderOptionsELF::ReaderOptionsELF() { |
| 766 | } |
| 767 | |
| 768 | ReaderOptionsELF::~ReaderOptionsELF() { |
| 769 | } |
| 770 | |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 771 | Reader *createReaderELF(const ReaderOptionsELF &options) { |
| 772 | return new ReaderELF(options); |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 773 | } |
| 774 | |
Sid Manning | 1a60141 | 2012-07-25 16:27:21 +0000 | [diff] [blame] | 775 | } // namespace LLD |