| File: | build/source/llvm/lib/Object/XCOFFObjectFile.cpp |
| Warning: | line 448, column 17 Value stored to 'SectionName' during its initialization is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
| 1 | //===--- XCOFFObjectFile.cpp - XCOFF object file implementation -----------===// |
| 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 | // This file defines the XCOFFObjectFile class. |
| 10 | // |
| 11 | //===----------------------------------------------------------------------===// |
| 12 | |
| 13 | #include "llvm/Object/XCOFFObjectFile.h" |
| 14 | #include "llvm/ADT/StringSwitch.h" |
| 15 | #include "llvm/MC/SubtargetFeature.h" |
| 16 | #include "llvm/Support/DataExtractor.h" |
| 17 | #include <cstddef> |
| 18 | #include <cstring> |
| 19 | |
| 20 | namespace llvm { |
| 21 | |
| 22 | using namespace XCOFF; |
| 23 | |
| 24 | namespace object { |
| 25 | |
| 26 | static const uint8_t FunctionSym = 0x20; |
| 27 | static const uint16_t NoRelMask = 0x0001; |
| 28 | static const size_t SymbolAuxTypeOffset = 17; |
| 29 | |
| 30 | // Checks that [Ptr, Ptr + Size) bytes fall inside the memory buffer |
| 31 | // 'M'. Returns a pointer to the underlying object on success. |
| 32 | template <typename T> |
| 33 | static Expected<const T *> getObject(MemoryBufferRef M, const void *Ptr, |
| 34 | const uint64_t Size = sizeof(T)) { |
| 35 | uintptr_t Addr = reinterpret_cast<uintptr_t>(Ptr); |
| 36 | if (Error E = Binary::checkOffset(M, Addr, Size)) |
| 37 | return std::move(E); |
| 38 | return reinterpret_cast<const T *>(Addr); |
| 39 | } |
| 40 | |
| 41 | static uintptr_t getWithOffset(uintptr_t Base, ptrdiff_t Offset) { |
| 42 | return reinterpret_cast<uintptr_t>(reinterpret_cast<const char *>(Base) + |
| 43 | Offset); |
| 44 | } |
| 45 | |
| 46 | template <typename T> static const T *viewAs(uintptr_t in) { |
| 47 | return reinterpret_cast<const T *>(in); |
| 48 | } |
| 49 | |
| 50 | static StringRef generateXCOFFFixedNameStringRef(const char *Name) { |
| 51 | auto NulCharPtr = |
| 52 | static_cast<const char *>(memchr(Name, '\0', XCOFF::NameSize)); |
| 53 | return NulCharPtr ? StringRef(Name, NulCharPtr - Name) |
| 54 | : StringRef(Name, XCOFF::NameSize); |
| 55 | } |
| 56 | |
| 57 | template <typename T> StringRef XCOFFSectionHeader<T>::getName() const { |
| 58 | const T &DerivedXCOFFSectionHeader = static_cast<const T &>(*this); |
| 59 | return generateXCOFFFixedNameStringRef(DerivedXCOFFSectionHeader.Name); |
| 60 | } |
| 61 | |
| 62 | template <typename T> uint16_t XCOFFSectionHeader<T>::getSectionType() const { |
| 63 | const T &DerivedXCOFFSectionHeader = static_cast<const T &>(*this); |
| 64 | return DerivedXCOFFSectionHeader.Flags & SectionFlagsTypeMask; |
| 65 | } |
| 66 | |
| 67 | template <typename T> |
| 68 | bool XCOFFSectionHeader<T>::isReservedSectionType() const { |
| 69 | return getSectionType() & SectionFlagsReservedMask; |
| 70 | } |
| 71 | |
| 72 | template <typename AddressType> |
| 73 | bool XCOFFRelocation<AddressType>::isRelocationSigned() const { |
| 74 | return Info & XR_SIGN_INDICATOR_MASK; |
| 75 | } |
| 76 | |
| 77 | template <typename AddressType> |
| 78 | bool XCOFFRelocation<AddressType>::isFixupIndicated() const { |
| 79 | return Info & XR_FIXUP_INDICATOR_MASK; |
| 80 | } |
| 81 | |
| 82 | template <typename AddressType> |
| 83 | uint8_t XCOFFRelocation<AddressType>::getRelocatedLength() const { |
| 84 | // The relocation encodes the bit length being relocated minus 1. Add back |
| 85 | // the 1 to get the actual length being relocated. |
| 86 | return (Info & XR_BIASED_LENGTH_MASK) + 1; |
| 87 | } |
| 88 | |
| 89 | template struct ExceptionSectionEntry<support::ubig32_t>; |
| 90 | template struct ExceptionSectionEntry<support::ubig64_t>; |
| 91 | |
| 92 | template <typename T> |
| 93 | Expected<StringRef> getLoaderSecSymNameInStrTbl(const T *LoaderSecHeader, |
| 94 | uint64_t Offset) { |
| 95 | if (LoaderSecHeader->LengthOfStrTbl > Offset) |
| 96 | return (reinterpret_cast<const char *>(LoaderSecHeader) + |
| 97 | LoaderSecHeader->OffsetToStrTbl + Offset); |
| 98 | |
| 99 | return createError("entry with offset 0x" + Twine::utohexstr(Offset) + |
| 100 | " in the loader section's string table with size 0x" + |
| 101 | Twine::utohexstr(LoaderSecHeader->LengthOfStrTbl) + |
| 102 | " is invalid"); |
| 103 | } |
| 104 | |
| 105 | Expected<StringRef> LoaderSectionSymbolEntry32::getSymbolName( |
| 106 | const LoaderSectionHeader32 *LoaderSecHeader32) const { |
| 107 | const NameOffsetInStrTbl *NameInStrTbl = |
| 108 | reinterpret_cast<const NameOffsetInStrTbl *>(SymbolName); |
| 109 | if (NameInStrTbl->IsNameInStrTbl != XCOFFSymbolRef::NAME_IN_STR_TBL_MAGIC) |
| 110 | return generateXCOFFFixedNameStringRef(SymbolName); |
| 111 | |
| 112 | return getLoaderSecSymNameInStrTbl(LoaderSecHeader32, NameInStrTbl->Offset); |
| 113 | } |
| 114 | |
| 115 | Expected<StringRef> LoaderSectionSymbolEntry64::getSymbolName( |
| 116 | const LoaderSectionHeader64 *LoaderSecHeader64) const { |
| 117 | return getLoaderSecSymNameInStrTbl(LoaderSecHeader64, Offset); |
| 118 | } |
| 119 | |
| 120 | uintptr_t |
| 121 | XCOFFObjectFile::getAdvancedSymbolEntryAddress(uintptr_t CurrentAddress, |
| 122 | uint32_t Distance) { |
| 123 | return getWithOffset(CurrentAddress, Distance * XCOFF::SymbolTableEntrySize); |
| 124 | } |
| 125 | |
| 126 | const XCOFF::SymbolAuxType * |
| 127 | XCOFFObjectFile::getSymbolAuxType(uintptr_t AuxEntryAddress) const { |
| 128 | assert(is64Bit() && "64-bit interface called on a 32-bit object file.")(static_cast <bool> (is64Bit() && "64-bit interface called on a 32-bit object file." ) ? void (0) : __assert_fail ("is64Bit() && \"64-bit interface called on a 32-bit object file.\"" , "llvm/lib/Object/XCOFFObjectFile.cpp", 128, __extension__ __PRETTY_FUNCTION__ )); |
| 129 | return viewAs<XCOFF::SymbolAuxType>( |
| 130 | getWithOffset(AuxEntryAddress, SymbolAuxTypeOffset)); |
| 131 | } |
| 132 | |
| 133 | void XCOFFObjectFile::checkSectionAddress(uintptr_t Addr, |
| 134 | uintptr_t TableAddress) const { |
| 135 | if (Addr < TableAddress) |
| 136 | report_fatal_error("Section header outside of section header table."); |
| 137 | |
| 138 | uintptr_t Offset = Addr - TableAddress; |
| 139 | if (Offset >= getSectionHeaderSize() * getNumberOfSections()) |
| 140 | report_fatal_error("Section header outside of section header table."); |
| 141 | |
| 142 | if (Offset % getSectionHeaderSize() != 0) |
| 143 | report_fatal_error( |
| 144 | "Section header pointer does not point to a valid section header."); |
| 145 | } |
| 146 | |
| 147 | const XCOFFSectionHeader32 * |
| 148 | XCOFFObjectFile::toSection32(DataRefImpl Ref) const { |
| 149 | assert(!is64Bit() && "32-bit interface called on 64-bit object file.")(static_cast <bool> (!is64Bit() && "32-bit interface called on 64-bit object file." ) ? void (0) : __assert_fail ("!is64Bit() && \"32-bit interface called on 64-bit object file.\"" , "llvm/lib/Object/XCOFFObjectFile.cpp", 149, __extension__ __PRETTY_FUNCTION__ )); |
| 150 | #ifndef NDEBUG |
| 151 | checkSectionAddress(Ref.p, getSectionHeaderTableAddress()); |
| 152 | #endif |
| 153 | return viewAs<XCOFFSectionHeader32>(Ref.p); |
| 154 | } |
| 155 | |
| 156 | const XCOFFSectionHeader64 * |
| 157 | XCOFFObjectFile::toSection64(DataRefImpl Ref) const { |
| 158 | assert(is64Bit() && "64-bit interface called on a 32-bit object file.")(static_cast <bool> (is64Bit() && "64-bit interface called on a 32-bit object file." ) ? void (0) : __assert_fail ("is64Bit() && \"64-bit interface called on a 32-bit object file.\"" , "llvm/lib/Object/XCOFFObjectFile.cpp", 158, __extension__ __PRETTY_FUNCTION__ )); |
| 159 | #ifndef NDEBUG |
| 160 | checkSectionAddress(Ref.p, getSectionHeaderTableAddress()); |
| 161 | #endif |
| 162 | return viewAs<XCOFFSectionHeader64>(Ref.p); |
| 163 | } |
| 164 | |
| 165 | XCOFFSymbolRef XCOFFObjectFile::toSymbolRef(DataRefImpl Ref) const { |
| 166 | assert(Ref.p != 0 && "Symbol table pointer can not be nullptr!")(static_cast <bool> (Ref.p != 0 && "Symbol table pointer can not be nullptr!" ) ? void (0) : __assert_fail ("Ref.p != 0 && \"Symbol table pointer can not be nullptr!\"" , "llvm/lib/Object/XCOFFObjectFile.cpp", 166, __extension__ __PRETTY_FUNCTION__ )); |
| 167 | #ifndef NDEBUG |
| 168 | checkSymbolEntryPointer(Ref.p); |
| 169 | #endif |
| 170 | return XCOFFSymbolRef(Ref, this); |
| 171 | } |
| 172 | |
| 173 | const XCOFFFileHeader32 *XCOFFObjectFile::fileHeader32() const { |
| 174 | assert(!is64Bit() && "32-bit interface called on 64-bit object file.")(static_cast <bool> (!is64Bit() && "32-bit interface called on 64-bit object file." ) ? void (0) : __assert_fail ("!is64Bit() && \"32-bit interface called on 64-bit object file.\"" , "llvm/lib/Object/XCOFFObjectFile.cpp", 174, __extension__ __PRETTY_FUNCTION__ )); |
| 175 | return static_cast<const XCOFFFileHeader32 *>(FileHeader); |
| 176 | } |
| 177 | |
| 178 | const XCOFFFileHeader64 *XCOFFObjectFile::fileHeader64() const { |
| 179 | assert(is64Bit() && "64-bit interface called on a 32-bit object file.")(static_cast <bool> (is64Bit() && "64-bit interface called on a 32-bit object file." ) ? void (0) : __assert_fail ("is64Bit() && \"64-bit interface called on a 32-bit object file.\"" , "llvm/lib/Object/XCOFFObjectFile.cpp", 179, __extension__ __PRETTY_FUNCTION__ )); |
| 180 | return static_cast<const XCOFFFileHeader64 *>(FileHeader); |
| 181 | } |
| 182 | |
| 183 | const XCOFFAuxiliaryHeader32 *XCOFFObjectFile::auxiliaryHeader32() const { |
| 184 | assert(!is64Bit() && "32-bit interface called on 64-bit object file.")(static_cast <bool> (!is64Bit() && "32-bit interface called on 64-bit object file." ) ? void (0) : __assert_fail ("!is64Bit() && \"32-bit interface called on 64-bit object file.\"" , "llvm/lib/Object/XCOFFObjectFile.cpp", 184, __extension__ __PRETTY_FUNCTION__ )); |
| 185 | return static_cast<const XCOFFAuxiliaryHeader32 *>(AuxiliaryHeader); |
| 186 | } |
| 187 | |
| 188 | const XCOFFAuxiliaryHeader64 *XCOFFObjectFile::auxiliaryHeader64() const { |
| 189 | assert(is64Bit() && "64-bit interface called on a 32-bit object file.")(static_cast <bool> (is64Bit() && "64-bit interface called on a 32-bit object file." ) ? void (0) : __assert_fail ("is64Bit() && \"64-bit interface called on a 32-bit object file.\"" , "llvm/lib/Object/XCOFFObjectFile.cpp", 189, __extension__ __PRETTY_FUNCTION__ )); |
| 190 | return static_cast<const XCOFFAuxiliaryHeader64 *>(AuxiliaryHeader); |
| 191 | } |
| 192 | |
| 193 | template <typename T> const T *XCOFFObjectFile::sectionHeaderTable() const { |
| 194 | return static_cast<const T *>(SectionHeaderTable); |
| 195 | } |
| 196 | |
| 197 | const XCOFFSectionHeader32 * |
| 198 | XCOFFObjectFile::sectionHeaderTable32() const { |
| 199 | assert(!is64Bit() && "32-bit interface called on 64-bit object file.")(static_cast <bool> (!is64Bit() && "32-bit interface called on 64-bit object file." ) ? void (0) : __assert_fail ("!is64Bit() && \"32-bit interface called on 64-bit object file.\"" , "llvm/lib/Object/XCOFFObjectFile.cpp", 199, __extension__ __PRETTY_FUNCTION__ )); |
| 200 | return static_cast<const XCOFFSectionHeader32 *>(SectionHeaderTable); |
| 201 | } |
| 202 | |
| 203 | const XCOFFSectionHeader64 * |
| 204 | XCOFFObjectFile::sectionHeaderTable64() const { |
| 205 | assert(is64Bit() && "64-bit interface called on a 32-bit object file.")(static_cast <bool> (is64Bit() && "64-bit interface called on a 32-bit object file." ) ? void (0) : __assert_fail ("is64Bit() && \"64-bit interface called on a 32-bit object file.\"" , "llvm/lib/Object/XCOFFObjectFile.cpp", 205, __extension__ __PRETTY_FUNCTION__ )); |
| 206 | return static_cast<const XCOFFSectionHeader64 *>(SectionHeaderTable); |
| 207 | } |
| 208 | |
| 209 | void XCOFFObjectFile::moveSymbolNext(DataRefImpl &Symb) const { |
| 210 | uintptr_t NextSymbolAddr = getAdvancedSymbolEntryAddress( |
| 211 | Symb.p, toSymbolRef(Symb).getNumberOfAuxEntries() + 1); |
| 212 | #ifndef NDEBUG |
| 213 | // This function is used by basic_symbol_iterator, which allows to |
| 214 | // point to the end-of-symbol-table address. |
| 215 | if (NextSymbolAddr != getEndOfSymbolTableAddress()) |
| 216 | checkSymbolEntryPointer(NextSymbolAddr); |
| 217 | #endif |
| 218 | Symb.p = NextSymbolAddr; |
| 219 | } |
| 220 | |
| 221 | Expected<StringRef> |
| 222 | XCOFFObjectFile::getStringTableEntry(uint32_t Offset) const { |
| 223 | // The byte offset is relative to the start of the string table. |
| 224 | // A byte offset value of 0 is a null or zero-length symbol |
| 225 | // name. A byte offset in the range 1 to 3 (inclusive) points into the length |
| 226 | // field; as a soft-error recovery mechanism, we treat such cases as having an |
| 227 | // offset of 0. |
| 228 | if (Offset < 4) |
| 229 | return StringRef(nullptr, 0); |
| 230 | |
| 231 | if (StringTable.Data != nullptr && StringTable.Size > Offset) |
| 232 | return (StringTable.Data + Offset); |
| 233 | |
| 234 | return createError("entry with offset 0x" + Twine::utohexstr(Offset) + |
| 235 | " in a string table with size 0x" + |
| 236 | Twine::utohexstr(StringTable.Size) + " is invalid"); |
| 237 | } |
| 238 | |
| 239 | StringRef XCOFFObjectFile::getStringTable() const { |
| 240 | // If the size is less than or equal to 4, then the string table contains no |
| 241 | // string data. |
| 242 | return StringRef(StringTable.Data, |
| 243 | StringTable.Size <= 4 ? 0 : StringTable.Size); |
| 244 | } |
| 245 | |
| 246 | Expected<StringRef> |
| 247 | XCOFFObjectFile::getCFileName(const XCOFFFileAuxEnt *CFileEntPtr) const { |
| 248 | if (CFileEntPtr->NameInStrTbl.Magic != XCOFFSymbolRef::NAME_IN_STR_TBL_MAGIC) |
| 249 | return generateXCOFFFixedNameStringRef(CFileEntPtr->Name); |
| 250 | return getStringTableEntry(CFileEntPtr->NameInStrTbl.Offset); |
| 251 | } |
| 252 | |
| 253 | Expected<StringRef> XCOFFObjectFile::getSymbolName(DataRefImpl Symb) const { |
| 254 | return toSymbolRef(Symb).getName(); |
| 255 | } |
| 256 | |
| 257 | Expected<uint64_t> XCOFFObjectFile::getSymbolAddress(DataRefImpl Symb) const { |
| 258 | return toSymbolRef(Symb).getValue(); |
| 259 | } |
| 260 | |
| 261 | uint64_t XCOFFObjectFile::getSymbolValueImpl(DataRefImpl Symb) const { |
| 262 | return toSymbolRef(Symb).getValue(); |
| 263 | } |
| 264 | |
| 265 | uint32_t XCOFFObjectFile::getSymbolAlignment(DataRefImpl Symb) const { |
| 266 | uint64_t Result = 0; |
| 267 | XCOFFSymbolRef XCOFFSym = toSymbolRef(Symb); |
| 268 | if (XCOFFSym.isCsectSymbol()) { |
| 269 | Expected<XCOFFCsectAuxRef> CsectAuxRefOrError = |
| 270 | XCOFFSym.getXCOFFCsectAuxRef(); |
| 271 | if (!CsectAuxRefOrError) |
| 272 | // TODO: report the error up the stack. |
| 273 | consumeError(CsectAuxRefOrError.takeError()); |
| 274 | else |
| 275 | Result = 1ULL << CsectAuxRefOrError.get().getAlignmentLog2(); |
| 276 | } |
| 277 | return Result; |
| 278 | } |
| 279 | |
| 280 | uint64_t XCOFFObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const { |
| 281 | uint64_t Result = 0; |
| 282 | XCOFFSymbolRef XCOFFSym = toSymbolRef(Symb); |
| 283 | if (XCOFFSym.isCsectSymbol()) { |
| 284 | Expected<XCOFFCsectAuxRef> CsectAuxRefOrError = |
| 285 | XCOFFSym.getXCOFFCsectAuxRef(); |
| 286 | if (!CsectAuxRefOrError) |
| 287 | // TODO: report the error up the stack. |
| 288 | consumeError(CsectAuxRefOrError.takeError()); |
| 289 | else { |
| 290 | XCOFFCsectAuxRef CsectAuxRef = CsectAuxRefOrError.get(); |
| 291 | assert(CsectAuxRef.getSymbolType() == XCOFF::XTY_CM)(static_cast <bool> (CsectAuxRef.getSymbolType() == XCOFF ::XTY_CM) ? void (0) : __assert_fail ("CsectAuxRef.getSymbolType() == XCOFF::XTY_CM" , "llvm/lib/Object/XCOFFObjectFile.cpp", 291, __extension__ __PRETTY_FUNCTION__ )); |
| 292 | Result = CsectAuxRef.getSectionOrLength(); |
| 293 | } |
| 294 | } |
| 295 | return Result; |
| 296 | } |
| 297 | |
| 298 | Expected<SymbolRef::Type> |
| 299 | XCOFFObjectFile::getSymbolType(DataRefImpl Symb) const { |
| 300 | XCOFFSymbolRef XCOFFSym = toSymbolRef(Symb); |
| 301 | |
| 302 | if (XCOFFSym.isFunction()) |
| 303 | return SymbolRef::ST_Function; |
| 304 | |
| 305 | if (XCOFF::C_FILE == XCOFFSym.getStorageClass()) |
| 306 | return SymbolRef::ST_File; |
| 307 | |
| 308 | int16_t SecNum = XCOFFSym.getSectionNumber(); |
| 309 | if (SecNum <= 0) |
| 310 | return SymbolRef::ST_Other; |
| 311 | |
| 312 | Expected<DataRefImpl> SecDRIOrErr = |
| 313 | getSectionByNum(XCOFFSym.getSectionNumber()); |
| 314 | |
| 315 | if (!SecDRIOrErr) |
| 316 | return SecDRIOrErr.takeError(); |
| 317 | |
| 318 | DataRefImpl SecDRI = SecDRIOrErr.get(); |
| 319 | |
| 320 | Expected<StringRef> SymNameOrError = XCOFFSym.getName(); |
| 321 | if (SymNameOrError) { |
| 322 | // The "TOC" symbol is treated as SymbolRef::ST_Other. |
| 323 | if (SymNameOrError.get() == "TOC") |
| 324 | return SymbolRef::ST_Other; |
| 325 | |
| 326 | // The symbol for a section name is treated as SymbolRef::ST_Other. |
| 327 | StringRef SecName; |
| 328 | if (is64Bit()) |
| 329 | SecName = XCOFFObjectFile::toSection64(SecDRIOrErr.get())->getName(); |
| 330 | else |
| 331 | SecName = XCOFFObjectFile::toSection32(SecDRIOrErr.get())->getName(); |
| 332 | |
| 333 | if (SecName == SymNameOrError.get()) |
| 334 | return SymbolRef::ST_Other; |
| 335 | } else |
| 336 | return SymNameOrError.takeError(); |
| 337 | |
| 338 | if (isSectionData(SecDRI) || isSectionBSS(SecDRI)) |
| 339 | return SymbolRef::ST_Data; |
| 340 | |
| 341 | if (isDebugSection(SecDRI)) |
| 342 | return SymbolRef::ST_Debug; |
| 343 | |
| 344 | return SymbolRef::ST_Other; |
| 345 | } |
| 346 | |
| 347 | Expected<section_iterator> |
| 348 | XCOFFObjectFile::getSymbolSection(DataRefImpl Symb) const { |
| 349 | const int16_t SectNum = toSymbolRef(Symb).getSectionNumber(); |
| 350 | |
| 351 | if (isReservedSectionNumber(SectNum)) |
| 352 | return section_end(); |
| 353 | |
| 354 | Expected<DataRefImpl> ExpSec = getSectionByNum(SectNum); |
| 355 | if (!ExpSec) |
| 356 | return ExpSec.takeError(); |
| 357 | |
| 358 | return section_iterator(SectionRef(ExpSec.get(), this)); |
| 359 | } |
| 360 | |
| 361 | void XCOFFObjectFile::moveSectionNext(DataRefImpl &Sec) const { |
| 362 | const char *Ptr = reinterpret_cast<const char *>(Sec.p); |
| 363 | Sec.p = reinterpret_cast<uintptr_t>(Ptr + getSectionHeaderSize()); |
| 364 | } |
| 365 | |
| 366 | Expected<StringRef> XCOFFObjectFile::getSectionName(DataRefImpl Sec) const { |
| 367 | return generateXCOFFFixedNameStringRef(getSectionNameInternal(Sec)); |
| 368 | } |
| 369 | |
| 370 | uint64_t XCOFFObjectFile::getSectionAddress(DataRefImpl Sec) const { |
| 371 | // Avoid ternary due to failure to convert the ubig32_t value to a unit64_t |
| 372 | // with MSVC. |
| 373 | if (is64Bit()) |
| 374 | return toSection64(Sec)->VirtualAddress; |
| 375 | |
| 376 | return toSection32(Sec)->VirtualAddress; |
| 377 | } |
| 378 | |
| 379 | uint64_t XCOFFObjectFile::getSectionIndex(DataRefImpl Sec) const { |
| 380 | // Section numbers in XCOFF are numbered beginning at 1. A section number of |
| 381 | // zero is used to indicate that a symbol is being imported or is undefined. |
| 382 | if (is64Bit()) |
| 383 | return toSection64(Sec) - sectionHeaderTable64() + 1; |
| 384 | else |
| 385 | return toSection32(Sec) - sectionHeaderTable32() + 1; |
| 386 | } |
| 387 | |
| 388 | uint64_t XCOFFObjectFile::getSectionSize(DataRefImpl Sec) const { |
| 389 | // Avoid ternary due to failure to convert the ubig32_t value to a unit64_t |
| 390 | // with MSVC. |
| 391 | if (is64Bit()) |
| 392 | return toSection64(Sec)->SectionSize; |
| 393 | |
| 394 | return toSection32(Sec)->SectionSize; |
| 395 | } |
| 396 | |
| 397 | Expected<ArrayRef<uint8_t>> |
| 398 | XCOFFObjectFile::getSectionContents(DataRefImpl Sec) const { |
| 399 | if (isSectionVirtual(Sec)) |
| 400 | return ArrayRef<uint8_t>(); |
| 401 | |
| 402 | uint64_t OffsetToRaw; |
| 403 | if (is64Bit()) |
| 404 | OffsetToRaw = toSection64(Sec)->FileOffsetToRawData; |
| 405 | else |
| 406 | OffsetToRaw = toSection32(Sec)->FileOffsetToRawData; |
| 407 | |
| 408 | const uint8_t * ContentStart = base() + OffsetToRaw; |
| 409 | uint64_t SectionSize = getSectionSize(Sec); |
| 410 | if (Error E = Binary::checkOffset( |
| 411 | Data, reinterpret_cast<uintptr_t>(ContentStart), SectionSize)) |
| 412 | return createError( |
| 413 | toString(std::move(E)) + ": section data with offset 0x" + |
| 414 | Twine::utohexstr(OffsetToRaw) + " and size 0x" + |
| 415 | Twine::utohexstr(SectionSize) + " goes past the end of the file"); |
| 416 | |
| 417 | return ArrayRef(ContentStart, SectionSize); |
| 418 | } |
| 419 | |
| 420 | uint64_t XCOFFObjectFile::getSectionAlignment(DataRefImpl Sec) const { |
| 421 | uint64_t Result = 0; |
| 422 | llvm_unreachable("Not yet implemented!")::llvm::llvm_unreachable_internal("Not yet implemented!", "llvm/lib/Object/XCOFFObjectFile.cpp" , 422); |
| 423 | return Result; |
| 424 | } |
| 425 | |
| 426 | uint64_t XCOFFObjectFile::getSectionFileOffsetToRawData(DataRefImpl Sec) const { |
| 427 | if (is64Bit()) |
| 428 | return toSection64(Sec)->FileOffsetToRawData; |
| 429 | |
| 430 | return toSection32(Sec)->FileOffsetToRawData; |
| 431 | } |
| 432 | |
| 433 | Expected<uintptr_t> XCOFFObjectFile::getSectionFileOffsetToRawData( |
| 434 | XCOFF::SectionTypeFlags SectType) const { |
| 435 | DataRefImpl DRI = getSectionByType(SectType); |
| 436 | |
| 437 | if (DRI.p == 0) // No section is not an error. |
| 438 | return 0; |
| 439 | |
| 440 | uint64_t SectionOffset = getSectionFileOffsetToRawData(DRI); |
| 441 | uint64_t SizeOfSection = getSectionSize(DRI); |
| 442 | |
| 443 | uintptr_t SectionStart = reinterpret_cast<uintptr_t>(base() + SectionOffset); |
| 444 | if (Error E = Binary::checkOffset(Data, SectionStart, SizeOfSection)) { |
| 445 | SmallString<32> UnknownType; |
| 446 | Twine(("<Unknown:") + Twine::utohexstr(SectType) + ">") |
| 447 | .toVector(UnknownType); |
| 448 | const char *SectionName = UnknownType.c_str(); |
Value stored to 'SectionName' during its initialization is never read | |
| 449 | |
| 450 | switch (SectType) { |
| 451 | #define ECASE(Value, String) \ |
| 452 | case XCOFF::Value: \ |
| 453 | SectionName = String; \ |
| 454 | break |
| 455 | |
| 456 | ECASE(STYP_PAD, "pad"); |
| 457 | ECASE(STYP_DWARF, "dwarf"); |
| 458 | ECASE(STYP_TEXT, "text"); |
| 459 | ECASE(STYP_DATA, "data"); |
| 460 | ECASE(STYP_BSS, "bss"); |
| 461 | ECASE(STYP_EXCEPT, "expect"); |
| 462 | ECASE(STYP_INFO, "info"); |
| 463 | ECASE(STYP_TDATA, "tdata"); |
| 464 | ECASE(STYP_TBSS, "tbss"); |
| 465 | ECASE(STYP_LOADER, "loader"); |
| 466 | ECASE(STYP_DEBUG, "debug"); |
| 467 | ECASE(STYP_TYPCHK, "typchk"); |
| 468 | ECASE(STYP_OVRFLO, "ovrflo"); |
| 469 | #undef ECASE |
| 470 | } |
| 471 | return createError(toString(std::move(E)) + ": " + SectionName + |
| 472 | " section with offset 0x" + |
| 473 | Twine::utohexstr(SectionOffset) + " and size 0x" + |
| 474 | Twine::utohexstr(SizeOfSection) + |
| 475 | " goes past the end of the file"); |
| 476 | } |
| 477 | return SectionStart; |
| 478 | } |
| 479 | |
| 480 | bool XCOFFObjectFile::isSectionCompressed(DataRefImpl Sec) const { |
| 481 | return false; |
| 482 | } |
| 483 | |
| 484 | bool XCOFFObjectFile::isSectionText(DataRefImpl Sec) const { |
| 485 | return getSectionFlags(Sec) & XCOFF::STYP_TEXT; |
| 486 | } |
| 487 | |
| 488 | bool XCOFFObjectFile::isSectionData(DataRefImpl Sec) const { |
| 489 | uint32_t Flags = getSectionFlags(Sec); |
| 490 | return Flags & (XCOFF::STYP_DATA | XCOFF::STYP_TDATA); |
| 491 | } |
| 492 | |
| 493 | bool XCOFFObjectFile::isSectionBSS(DataRefImpl Sec) const { |
| 494 | uint32_t Flags = getSectionFlags(Sec); |
| 495 | return Flags & (XCOFF::STYP_BSS | XCOFF::STYP_TBSS); |
| 496 | } |
| 497 | |
| 498 | bool XCOFFObjectFile::isDebugSection(DataRefImpl Sec) const { |
| 499 | uint32_t Flags = getSectionFlags(Sec); |
| 500 | return Flags & (XCOFF::STYP_DEBUG | XCOFF::STYP_DWARF); |
| 501 | } |
| 502 | |
| 503 | bool XCOFFObjectFile::isSectionVirtual(DataRefImpl Sec) const { |
| 504 | return is64Bit() ? toSection64(Sec)->FileOffsetToRawData == 0 |
| 505 | : toSection32(Sec)->FileOffsetToRawData == 0; |
| 506 | } |
| 507 | |
| 508 | relocation_iterator XCOFFObjectFile::section_rel_begin(DataRefImpl Sec) const { |
| 509 | DataRefImpl Ret; |
| 510 | if (is64Bit()) { |
| 511 | const XCOFFSectionHeader64 *SectionEntPtr = toSection64(Sec); |
| 512 | auto RelocationsOrErr = |
| 513 | relocations<XCOFFSectionHeader64, XCOFFRelocation64>(*SectionEntPtr); |
| 514 | if (Error E = RelocationsOrErr.takeError()) { |
| 515 | // TODO: report the error up the stack. |
| 516 | consumeError(std::move(E)); |
| 517 | return relocation_iterator(RelocationRef()); |
| 518 | } |
| 519 | Ret.p = reinterpret_cast<uintptr_t>(&*RelocationsOrErr.get().begin()); |
| 520 | } else { |
| 521 | const XCOFFSectionHeader32 *SectionEntPtr = toSection32(Sec); |
| 522 | auto RelocationsOrErr = |
| 523 | relocations<XCOFFSectionHeader32, XCOFFRelocation32>(*SectionEntPtr); |
| 524 | if (Error E = RelocationsOrErr.takeError()) { |
| 525 | // TODO: report the error up the stack. |
| 526 | consumeError(std::move(E)); |
| 527 | return relocation_iterator(RelocationRef()); |
| 528 | } |
| 529 | Ret.p = reinterpret_cast<uintptr_t>(&*RelocationsOrErr.get().begin()); |
| 530 | } |
| 531 | return relocation_iterator(RelocationRef(Ret, this)); |
| 532 | } |
| 533 | |
| 534 | relocation_iterator XCOFFObjectFile::section_rel_end(DataRefImpl Sec) const { |
| 535 | DataRefImpl Ret; |
| 536 | if (is64Bit()) { |
| 537 | const XCOFFSectionHeader64 *SectionEntPtr = toSection64(Sec); |
| 538 | auto RelocationsOrErr = |
| 539 | relocations<XCOFFSectionHeader64, XCOFFRelocation64>(*SectionEntPtr); |
| 540 | if (Error E = RelocationsOrErr.takeError()) { |
| 541 | // TODO: report the error up the stack. |
| 542 | consumeError(std::move(E)); |
| 543 | return relocation_iterator(RelocationRef()); |
| 544 | } |
| 545 | Ret.p = reinterpret_cast<uintptr_t>(&*RelocationsOrErr.get().end()); |
| 546 | } else { |
| 547 | const XCOFFSectionHeader32 *SectionEntPtr = toSection32(Sec); |
| 548 | auto RelocationsOrErr = |
| 549 | relocations<XCOFFSectionHeader32, XCOFFRelocation32>(*SectionEntPtr); |
| 550 | if (Error E = RelocationsOrErr.takeError()) { |
| 551 | // TODO: report the error up the stack. |
| 552 | consumeError(std::move(E)); |
| 553 | return relocation_iterator(RelocationRef()); |
| 554 | } |
| 555 | Ret.p = reinterpret_cast<uintptr_t>(&*RelocationsOrErr.get().end()); |
| 556 | } |
| 557 | return relocation_iterator(RelocationRef(Ret, this)); |
| 558 | } |
| 559 | |
| 560 | void XCOFFObjectFile::moveRelocationNext(DataRefImpl &Rel) const { |
| 561 | if (is64Bit()) |
| 562 | Rel.p = reinterpret_cast<uintptr_t>(viewAs<XCOFFRelocation64>(Rel.p) + 1); |
| 563 | else |
| 564 | Rel.p = reinterpret_cast<uintptr_t>(viewAs<XCOFFRelocation32>(Rel.p) + 1); |
| 565 | } |
| 566 | |
| 567 | uint64_t XCOFFObjectFile::getRelocationOffset(DataRefImpl Rel) const { |
| 568 | if (is64Bit()) { |
| 569 | const XCOFFRelocation64 *Reloc = viewAs<XCOFFRelocation64>(Rel.p); |
| 570 | const XCOFFSectionHeader64 *Sec64 = sectionHeaderTable64(); |
| 571 | const uint64_t RelocAddress = Reloc->VirtualAddress; |
| 572 | const uint16_t NumberOfSections = getNumberOfSections(); |
| 573 | for (uint16_t I = 0; I < NumberOfSections; ++I) { |
| 574 | // Find which section this relocation belongs to, and get the |
| 575 | // relocation offset relative to the start of the section. |
| 576 | if (Sec64->VirtualAddress <= RelocAddress && |
| 577 | RelocAddress < Sec64->VirtualAddress + Sec64->SectionSize) { |
| 578 | return RelocAddress - Sec64->VirtualAddress; |
| 579 | } |
| 580 | ++Sec64; |
| 581 | } |
| 582 | } else { |
| 583 | const XCOFFRelocation32 *Reloc = viewAs<XCOFFRelocation32>(Rel.p); |
| 584 | const XCOFFSectionHeader32 *Sec32 = sectionHeaderTable32(); |
| 585 | const uint32_t RelocAddress = Reloc->VirtualAddress; |
| 586 | const uint16_t NumberOfSections = getNumberOfSections(); |
| 587 | for (uint16_t I = 0; I < NumberOfSections; ++I) { |
| 588 | // Find which section this relocation belongs to, and get the |
| 589 | // relocation offset relative to the start of the section. |
| 590 | if (Sec32->VirtualAddress <= RelocAddress && |
| 591 | RelocAddress < Sec32->VirtualAddress + Sec32->SectionSize) { |
| 592 | return RelocAddress - Sec32->VirtualAddress; |
| 593 | } |
| 594 | ++Sec32; |
| 595 | } |
| 596 | } |
| 597 | return InvalidRelocOffset; |
| 598 | } |
| 599 | |
| 600 | symbol_iterator XCOFFObjectFile::getRelocationSymbol(DataRefImpl Rel) const { |
| 601 | uint32_t Index; |
| 602 | if (is64Bit()) { |
| 603 | const XCOFFRelocation64 *Reloc = viewAs<XCOFFRelocation64>(Rel.p); |
| 604 | Index = Reloc->SymbolIndex; |
| 605 | |
| 606 | if (Index >= getNumberOfSymbolTableEntries64()) |
| 607 | return symbol_end(); |
| 608 | } else { |
| 609 | const XCOFFRelocation32 *Reloc = viewAs<XCOFFRelocation32>(Rel.p); |
| 610 | Index = Reloc->SymbolIndex; |
| 611 | |
| 612 | if (Index >= getLogicalNumberOfSymbolTableEntries32()) |
| 613 | return symbol_end(); |
| 614 | } |
| 615 | DataRefImpl SymDRI; |
| 616 | SymDRI.p = getSymbolEntryAddressByIndex(Index); |
| 617 | return symbol_iterator(SymbolRef(SymDRI, this)); |
| 618 | } |
| 619 | |
| 620 | uint64_t XCOFFObjectFile::getRelocationType(DataRefImpl Rel) const { |
| 621 | if (is64Bit()) |
| 622 | return viewAs<XCOFFRelocation64>(Rel.p)->Type; |
| 623 | return viewAs<XCOFFRelocation32>(Rel.p)->Type; |
| 624 | } |
| 625 | |
| 626 | void XCOFFObjectFile::getRelocationTypeName( |
| 627 | DataRefImpl Rel, SmallVectorImpl<char> &Result) const { |
| 628 | StringRef Res; |
| 629 | if (is64Bit()) { |
| 630 | const XCOFFRelocation64 *Reloc = viewAs<XCOFFRelocation64>(Rel.p); |
| 631 | Res = XCOFF::getRelocationTypeString(Reloc->Type); |
| 632 | } else { |
| 633 | const XCOFFRelocation32 *Reloc = viewAs<XCOFFRelocation32>(Rel.p); |
| 634 | Res = XCOFF::getRelocationTypeString(Reloc->Type); |
| 635 | } |
| 636 | Result.append(Res.begin(), Res.end()); |
| 637 | } |
| 638 | |
| 639 | Expected<uint32_t> XCOFFObjectFile::getSymbolFlags(DataRefImpl Symb) const { |
| 640 | XCOFFSymbolRef XCOFFSym = toSymbolRef(Symb); |
| 641 | uint32_t Result = SymbolRef::SF_None; |
| 642 | |
| 643 | if (XCOFFSym.getSectionNumber() == XCOFF::N_ABS) |
| 644 | Result |= SymbolRef::SF_Absolute; |
| 645 | |
| 646 | XCOFF::StorageClass SC = XCOFFSym.getStorageClass(); |
| 647 | if (XCOFF::C_EXT == SC || XCOFF::C_WEAKEXT == SC) |
| 648 | Result |= SymbolRef::SF_Global; |
| 649 | |
| 650 | if (XCOFF::C_WEAKEXT == SC) |
| 651 | Result |= SymbolRef::SF_Weak; |
| 652 | |
| 653 | if (XCOFFSym.isCsectSymbol()) { |
| 654 | Expected<XCOFFCsectAuxRef> CsectAuxEntOrErr = |
| 655 | XCOFFSym.getXCOFFCsectAuxRef(); |
| 656 | if (CsectAuxEntOrErr) { |
| 657 | if (CsectAuxEntOrErr.get().getSymbolType() == XCOFF::XTY_CM) |
| 658 | Result |= SymbolRef::SF_Common; |
| 659 | } else |
| 660 | return CsectAuxEntOrErr.takeError(); |
| 661 | } |
| 662 | |
| 663 | if (XCOFFSym.getSectionNumber() == XCOFF::N_UNDEF) |
| 664 | Result |= SymbolRef::SF_Undefined; |
| 665 | |
| 666 | // There is no visibility in old 32 bit XCOFF object file interpret. |
| 667 | if (is64Bit() || (auxiliaryHeader32() && (auxiliaryHeader32()->getVersion() == |
| 668 | NEW_XCOFF_INTERPRET))) { |
| 669 | uint16_t SymType = XCOFFSym.getSymbolType(); |
| 670 | if ((SymType & VISIBILITY_MASK) == SYM_V_HIDDEN) |
| 671 | Result |= SymbolRef::SF_Hidden; |
| 672 | |
| 673 | if ((SymType & VISIBILITY_MASK) == SYM_V_EXPORTED) |
| 674 | Result |= SymbolRef::SF_Exported; |
| 675 | } |
| 676 | return Result; |
| 677 | } |
| 678 | |
| 679 | basic_symbol_iterator XCOFFObjectFile::symbol_begin() const { |
| 680 | DataRefImpl SymDRI; |
| 681 | SymDRI.p = reinterpret_cast<uintptr_t>(SymbolTblPtr); |
| 682 | return basic_symbol_iterator(SymbolRef(SymDRI, this)); |
| 683 | } |
| 684 | |
| 685 | basic_symbol_iterator XCOFFObjectFile::symbol_end() const { |
| 686 | DataRefImpl SymDRI; |
| 687 | const uint32_t NumberOfSymbolTableEntries = getNumberOfSymbolTableEntries(); |
| 688 | SymDRI.p = getSymbolEntryAddressByIndex(NumberOfSymbolTableEntries); |
| 689 | return basic_symbol_iterator(SymbolRef(SymDRI, this)); |
| 690 | } |
| 691 | |
| 692 | section_iterator XCOFFObjectFile::section_begin() const { |
| 693 | DataRefImpl DRI; |
| 694 | DRI.p = getSectionHeaderTableAddress(); |
| 695 | return section_iterator(SectionRef(DRI, this)); |
| 696 | } |
| 697 | |
| 698 | section_iterator XCOFFObjectFile::section_end() const { |
| 699 | DataRefImpl DRI; |
| 700 | DRI.p = getWithOffset(getSectionHeaderTableAddress(), |
| 701 | getNumberOfSections() * getSectionHeaderSize()); |
| 702 | return section_iterator(SectionRef(DRI, this)); |
| 703 | } |
| 704 | |
| 705 | uint8_t XCOFFObjectFile::getBytesInAddress() const { return is64Bit() ? 8 : 4; } |
| 706 | |
| 707 | StringRef XCOFFObjectFile::getFileFormatName() const { |
| 708 | return is64Bit() ? "aix5coff64-rs6000" : "aixcoff-rs6000"; |
| 709 | } |
| 710 | |
| 711 | Triple::ArchType XCOFFObjectFile::getArch() const { |
| 712 | return is64Bit() ? Triple::ppc64 : Triple::ppc; |
| 713 | } |
| 714 | |
| 715 | Expected<SubtargetFeatures> XCOFFObjectFile::getFeatures() const { |
| 716 | return SubtargetFeatures(); |
| 717 | } |
| 718 | |
| 719 | bool XCOFFObjectFile::isRelocatableObject() const { |
| 720 | if (is64Bit()) |
| 721 | return !(fileHeader64()->Flags & NoRelMask); |
| 722 | return !(fileHeader32()->Flags & NoRelMask); |
| 723 | } |
| 724 | |
| 725 | Expected<uint64_t> XCOFFObjectFile::getStartAddress() const { |
| 726 | // TODO FIXME Should get from auxiliary_header->o_entry when support for the |
| 727 | // auxiliary_header is added. |
| 728 | return 0; |
| 729 | } |
| 730 | |
| 731 | StringRef XCOFFObjectFile::mapDebugSectionName(StringRef Name) const { |
| 732 | return StringSwitch<StringRef>(Name) |
| 733 | .Case("dwinfo", "debug_info") |
| 734 | .Case("dwline", "debug_line") |
| 735 | .Case("dwpbnms", "debug_pubnames") |
| 736 | .Case("dwpbtyp", "debug_pubtypes") |
| 737 | .Case("dwarnge", "debug_aranges") |
| 738 | .Case("dwabrev", "debug_abbrev") |
| 739 | .Case("dwstr", "debug_str") |
| 740 | .Case("dwrnges", "debug_ranges") |
| 741 | .Case("dwloc", "debug_loc") |
| 742 | .Case("dwframe", "debug_frame") |
| 743 | .Case("dwmac", "debug_macinfo") |
| 744 | .Default(Name); |
| 745 | } |
| 746 | |
| 747 | size_t XCOFFObjectFile::getFileHeaderSize() const { |
| 748 | return is64Bit() ? sizeof(XCOFFFileHeader64) : sizeof(XCOFFFileHeader32); |
| 749 | } |
| 750 | |
| 751 | size_t XCOFFObjectFile::getSectionHeaderSize() const { |
| 752 | return is64Bit() ? sizeof(XCOFFSectionHeader64) : |
| 753 | sizeof(XCOFFSectionHeader32); |
| 754 | } |
| 755 | |
| 756 | bool XCOFFObjectFile::is64Bit() const { |
| 757 | return Binary::ID_XCOFF64 == getType(); |
| 758 | } |
| 759 | |
| 760 | Expected<StringRef> XCOFFObjectFile::getRawData(const char *Start, |
| 761 | uint64_t Size, |
| 762 | StringRef Name) const { |
| 763 | uintptr_t StartPtr = reinterpret_cast<uintptr_t>(Start); |
| 764 | // TODO: this path is untested. |
| 765 | if (Error E = Binary::checkOffset(Data, StartPtr, Size)) |
| 766 | return createError(toString(std::move(E)) + ": " + Name.data() + |
| 767 | " data with offset 0x" + Twine::utohexstr(StartPtr) + |
| 768 | " and size 0x" + Twine::utohexstr(Size) + |
| 769 | " goes past the end of the file"); |
| 770 | return StringRef(Start, Size); |
| 771 | } |
| 772 | |
| 773 | uint16_t XCOFFObjectFile::getMagic() const { |
| 774 | return is64Bit() ? fileHeader64()->Magic : fileHeader32()->Magic; |
| 775 | } |
| 776 | |
| 777 | Expected<DataRefImpl> XCOFFObjectFile::getSectionByNum(int16_t Num) const { |
| 778 | if (Num <= 0 || Num > getNumberOfSections()) |
| 779 | return createStringError(object_error::invalid_section_index, |
| 780 | "the section index (" + Twine(Num) + |
| 781 | ") is invalid"); |
| 782 | |
| 783 | DataRefImpl DRI; |
| 784 | DRI.p = getWithOffset(getSectionHeaderTableAddress(), |
| 785 | getSectionHeaderSize() * (Num - 1)); |
| 786 | return DRI; |
| 787 | } |
| 788 | |
| 789 | DataRefImpl |
| 790 | XCOFFObjectFile::getSectionByType(XCOFF::SectionTypeFlags SectType) const { |
| 791 | DataRefImpl DRI; |
| 792 | auto GetSectionAddr = [&](const auto &Sections) -> uintptr_t { |
| 793 | for (const auto &Sec : Sections) |
| 794 | if (Sec.getSectionType() == SectType) |
| 795 | return reinterpret_cast<uintptr_t>(&Sec); |
| 796 | return uintptr_t(0); |
| 797 | }; |
| 798 | if (is64Bit()) |
| 799 | DRI.p = GetSectionAddr(sections64()); |
| 800 | else |
| 801 | DRI.p = GetSectionAddr(sections32()); |
| 802 | return DRI; |
| 803 | } |
| 804 | |
| 805 | Expected<StringRef> |
| 806 | XCOFFObjectFile::getSymbolSectionName(XCOFFSymbolRef SymEntPtr) const { |
| 807 | const int16_t SectionNum = SymEntPtr.getSectionNumber(); |
| 808 | |
| 809 | switch (SectionNum) { |
| 810 | case XCOFF::N_DEBUG: |
| 811 | return "N_DEBUG"; |
| 812 | case XCOFF::N_ABS: |
| 813 | return "N_ABS"; |
| 814 | case XCOFF::N_UNDEF: |
| 815 | return "N_UNDEF"; |
| 816 | default: |
| 817 | Expected<DataRefImpl> SecRef = getSectionByNum(SectionNum); |
| 818 | if (SecRef) |
| 819 | return generateXCOFFFixedNameStringRef( |
| 820 | getSectionNameInternal(SecRef.get())); |
| 821 | return SecRef.takeError(); |
| 822 | } |
| 823 | } |
| 824 | |
| 825 | unsigned XCOFFObjectFile::getSymbolSectionID(SymbolRef Sym) const { |
| 826 | XCOFFSymbolRef XCOFFSymRef(Sym.getRawDataRefImpl(), this); |
| 827 | return XCOFFSymRef.getSectionNumber(); |
| 828 | } |
| 829 | |
| 830 | bool XCOFFObjectFile::isReservedSectionNumber(int16_t SectionNumber) { |
| 831 | return (SectionNumber <= 0 && SectionNumber >= -2); |
| 832 | } |
| 833 | |
| 834 | uint16_t XCOFFObjectFile::getNumberOfSections() const { |
| 835 | return is64Bit() ? fileHeader64()->NumberOfSections |
| 836 | : fileHeader32()->NumberOfSections; |
| 837 | } |
| 838 | |
| 839 | int32_t XCOFFObjectFile::getTimeStamp() const { |
| 840 | return is64Bit() ? fileHeader64()->TimeStamp : fileHeader32()->TimeStamp; |
| 841 | } |
| 842 | |
| 843 | uint16_t XCOFFObjectFile::getOptionalHeaderSize() const { |
| 844 | return is64Bit() ? fileHeader64()->AuxHeaderSize |
| 845 | : fileHeader32()->AuxHeaderSize; |
| 846 | } |
| 847 | |
| 848 | uint32_t XCOFFObjectFile::getSymbolTableOffset32() const { |
| 849 | return fileHeader32()->SymbolTableOffset; |
| 850 | } |
| 851 | |
| 852 | int32_t XCOFFObjectFile::getRawNumberOfSymbolTableEntries32() const { |
| 853 | // As far as symbol table size is concerned, if this field is negative it is |
| 854 | // to be treated as a 0. However since this field is also used for printing we |
| 855 | // don't want to truncate any negative values. |
| 856 | return fileHeader32()->NumberOfSymTableEntries; |
| 857 | } |
| 858 | |
| 859 | uint32_t XCOFFObjectFile::getLogicalNumberOfSymbolTableEntries32() const { |
| 860 | return (fileHeader32()->NumberOfSymTableEntries >= 0 |
| 861 | ? fileHeader32()->NumberOfSymTableEntries |
| 862 | : 0); |
| 863 | } |
| 864 | |
| 865 | uint64_t XCOFFObjectFile::getSymbolTableOffset64() const { |
| 866 | return fileHeader64()->SymbolTableOffset; |
| 867 | } |
| 868 | |
| 869 | uint32_t XCOFFObjectFile::getNumberOfSymbolTableEntries64() const { |
| 870 | return fileHeader64()->NumberOfSymTableEntries; |
| 871 | } |
| 872 | |
| 873 | uint32_t XCOFFObjectFile::getNumberOfSymbolTableEntries() const { |
| 874 | return is64Bit() ? getNumberOfSymbolTableEntries64() |
| 875 | : getLogicalNumberOfSymbolTableEntries32(); |
| 876 | } |
| 877 | |
| 878 | uintptr_t XCOFFObjectFile::getEndOfSymbolTableAddress() const { |
| 879 | const uint32_t NumberOfSymTableEntries = getNumberOfSymbolTableEntries(); |
| 880 | return getWithOffset(reinterpret_cast<uintptr_t>(SymbolTblPtr), |
| 881 | XCOFF::SymbolTableEntrySize * NumberOfSymTableEntries); |
| 882 | } |
| 883 | |
| 884 | void XCOFFObjectFile::checkSymbolEntryPointer(uintptr_t SymbolEntPtr) const { |
| 885 | if (SymbolEntPtr < reinterpret_cast<uintptr_t>(SymbolTblPtr)) |
| 886 | report_fatal_error("Symbol table entry is outside of symbol table."); |
| 887 | |
| 888 | if (SymbolEntPtr >= getEndOfSymbolTableAddress()) |
| 889 | report_fatal_error("Symbol table entry is outside of symbol table."); |
| 890 | |
| 891 | ptrdiff_t Offset = reinterpret_cast<const char *>(SymbolEntPtr) - |
| 892 | reinterpret_cast<const char *>(SymbolTblPtr); |
| 893 | |
| 894 | if (Offset % XCOFF::SymbolTableEntrySize != 0) |
| 895 | report_fatal_error( |
| 896 | "Symbol table entry position is not valid inside of symbol table."); |
| 897 | } |
| 898 | |
| 899 | uint32_t XCOFFObjectFile::getSymbolIndex(uintptr_t SymbolEntPtr) const { |
| 900 | return (reinterpret_cast<const char *>(SymbolEntPtr) - |
| 901 | reinterpret_cast<const char *>(SymbolTblPtr)) / |
| 902 | XCOFF::SymbolTableEntrySize; |
| 903 | } |
| 904 | |
| 905 | uint64_t XCOFFObjectFile::getSymbolSize(DataRefImpl Symb) const { |
| 906 | uint64_t Result = 0; |
| 907 | XCOFFSymbolRef XCOFFSym = toSymbolRef(Symb); |
| 908 | if (XCOFFSym.isCsectSymbol()) { |
| 909 | Expected<XCOFFCsectAuxRef> CsectAuxRefOrError = |
| 910 | XCOFFSym.getXCOFFCsectAuxRef(); |
| 911 | if (!CsectAuxRefOrError) |
| 912 | // TODO: report the error up the stack. |
| 913 | consumeError(CsectAuxRefOrError.takeError()); |
| 914 | else { |
| 915 | XCOFFCsectAuxRef CsectAuxRef = CsectAuxRefOrError.get(); |
| 916 | uint8_t SymType = CsectAuxRef.getSymbolType(); |
| 917 | if (SymType == XCOFF::XTY_SD || SymType == XCOFF::XTY_CM) |
| 918 | Result = CsectAuxRef.getSectionOrLength(); |
| 919 | } |
| 920 | } |
| 921 | return Result; |
| 922 | } |
| 923 | |
| 924 | uintptr_t XCOFFObjectFile::getSymbolEntryAddressByIndex(uint32_t Index) const { |
| 925 | return getAdvancedSymbolEntryAddress( |
| 926 | reinterpret_cast<uintptr_t>(getPointerToSymbolTable()), Index); |
| 927 | } |
| 928 | |
| 929 | Expected<StringRef> |
| 930 | XCOFFObjectFile::getSymbolNameByIndex(uint32_t Index) const { |
| 931 | const uint32_t NumberOfSymTableEntries = getNumberOfSymbolTableEntries(); |
| 932 | |
| 933 | if (Index >= NumberOfSymTableEntries) |
| 934 | return createError("symbol index " + Twine(Index) + |
| 935 | " exceeds symbol count " + |
| 936 | Twine(NumberOfSymTableEntries)); |
| 937 | |
| 938 | DataRefImpl SymDRI; |
| 939 | SymDRI.p = getSymbolEntryAddressByIndex(Index); |
| 940 | return getSymbolName(SymDRI); |
| 941 | } |
| 942 | |
| 943 | uint16_t XCOFFObjectFile::getFlags() const { |
| 944 | return is64Bit() ? fileHeader64()->Flags : fileHeader32()->Flags; |
| 945 | } |
| 946 | |
| 947 | const char *XCOFFObjectFile::getSectionNameInternal(DataRefImpl Sec) const { |
| 948 | return is64Bit() ? toSection64(Sec)->Name : toSection32(Sec)->Name; |
| 949 | } |
| 950 | |
| 951 | uintptr_t XCOFFObjectFile::getSectionHeaderTableAddress() const { |
| 952 | return reinterpret_cast<uintptr_t>(SectionHeaderTable); |
| 953 | } |
| 954 | |
| 955 | int32_t XCOFFObjectFile::getSectionFlags(DataRefImpl Sec) const { |
| 956 | return is64Bit() ? toSection64(Sec)->Flags : toSection32(Sec)->Flags; |
| 957 | } |
| 958 | |
| 959 | XCOFFObjectFile::XCOFFObjectFile(unsigned int Type, MemoryBufferRef Object) |
| 960 | : ObjectFile(Type, Object) { |
| 961 | assert(Type == Binary::ID_XCOFF32 || Type == Binary::ID_XCOFF64)(static_cast <bool> (Type == Binary::ID_XCOFF32 || Type == Binary::ID_XCOFF64) ? void (0) : __assert_fail ("Type == Binary::ID_XCOFF32 || Type == Binary::ID_XCOFF64" , "llvm/lib/Object/XCOFFObjectFile.cpp", 961, __extension__ __PRETTY_FUNCTION__ )); |
| 962 | } |
| 963 | |
| 964 | ArrayRef<XCOFFSectionHeader64> XCOFFObjectFile::sections64() const { |
| 965 | assert(is64Bit() && "64-bit interface called for non 64-bit file.")(static_cast <bool> (is64Bit() && "64-bit interface called for non 64-bit file." ) ? void (0) : __assert_fail ("is64Bit() && \"64-bit interface called for non 64-bit file.\"" , "llvm/lib/Object/XCOFFObjectFile.cpp", 965, __extension__ __PRETTY_FUNCTION__ )); |
| 966 | const XCOFFSectionHeader64 *TablePtr = sectionHeaderTable64(); |
| 967 | return ArrayRef<XCOFFSectionHeader64>(TablePtr, |
| 968 | TablePtr + getNumberOfSections()); |
| 969 | } |
| 970 | |
| 971 | ArrayRef<XCOFFSectionHeader32> XCOFFObjectFile::sections32() const { |
| 972 | assert(!is64Bit() && "32-bit interface called for non 32-bit file.")(static_cast <bool> (!is64Bit() && "32-bit interface called for non 32-bit file." ) ? void (0) : __assert_fail ("!is64Bit() && \"32-bit interface called for non 32-bit file.\"" , "llvm/lib/Object/XCOFFObjectFile.cpp", 972, __extension__ __PRETTY_FUNCTION__ )); |
| 973 | const XCOFFSectionHeader32 *TablePtr = sectionHeaderTable32(); |
| 974 | return ArrayRef<XCOFFSectionHeader32>(TablePtr, |
| 975 | TablePtr + getNumberOfSections()); |
| 976 | } |
| 977 | |
| 978 | // In an XCOFF32 file, when the field value is 65535, then an STYP_OVRFLO |
| 979 | // section header contains the actual count of relocation entries in the s_paddr |
| 980 | // field. STYP_OVRFLO headers contain the section index of their corresponding |
| 981 | // sections as their raw "NumberOfRelocations" field value. |
| 982 | template <typename T> |
| 983 | Expected<uint32_t> XCOFFObjectFile::getNumberOfRelocationEntries( |
| 984 | const XCOFFSectionHeader<T> &Sec) const { |
| 985 | const T &Section = static_cast<const T &>(Sec); |
| 986 | if (is64Bit()) |
| 987 | return Section.NumberOfRelocations; |
| 988 | |
| 989 | uint16_t SectionIndex = &Section - sectionHeaderTable<T>() + 1; |
| 990 | if (Section.NumberOfRelocations < XCOFF::RelocOverflow) |
| 991 | return Section.NumberOfRelocations; |
| 992 | for (const auto &Sec : sections32()) { |
| 993 | if (Sec.Flags == XCOFF::STYP_OVRFLO && |
| 994 | Sec.NumberOfRelocations == SectionIndex) |
| 995 | return Sec.PhysicalAddress; |
| 996 | } |
| 997 | return errorCodeToError(object_error::parse_failed); |
| 998 | } |
| 999 | |
| 1000 | template <typename Shdr, typename Reloc> |
| 1001 | Expected<ArrayRef<Reloc>> XCOFFObjectFile::relocations(const Shdr &Sec) const { |
| 1002 | uintptr_t RelocAddr = getWithOffset(reinterpret_cast<uintptr_t>(FileHeader), |
| 1003 | Sec.FileOffsetToRelocationInfo); |
| 1004 | auto NumRelocEntriesOrErr = getNumberOfRelocationEntries(Sec); |
| 1005 | if (Error E = NumRelocEntriesOrErr.takeError()) |
| 1006 | return std::move(E); |
| 1007 | |
| 1008 | uint32_t NumRelocEntries = NumRelocEntriesOrErr.get(); |
| 1009 | static_assert((sizeof(Reloc) == XCOFF::RelocationSerializationSize64 || |
| 1010 | sizeof(Reloc) == XCOFF::RelocationSerializationSize32), |
| 1011 | "Relocation structure is incorrect"); |
| 1012 | auto RelocationOrErr = |
| 1013 | getObject<Reloc>(Data, reinterpret_cast<void *>(RelocAddr), |
| 1014 | NumRelocEntries * sizeof(Reloc)); |
| 1015 | if (!RelocationOrErr) |
| 1016 | return createError( |
| 1017 | toString(RelocationOrErr.takeError()) + ": relocations with offset 0x" + |
| 1018 | Twine::utohexstr(Sec.FileOffsetToRelocationInfo) + " and size 0x" + |
| 1019 | Twine::utohexstr(NumRelocEntries * sizeof(Reloc)) + |
| 1020 | " go past the end of the file"); |
| 1021 | |
| 1022 | const Reloc *StartReloc = RelocationOrErr.get(); |
| 1023 | |
| 1024 | return ArrayRef<Reloc>(StartReloc, StartReloc + NumRelocEntries); |
| 1025 | } |
| 1026 | |
| 1027 | template <typename ExceptEnt> |
| 1028 | Expected<ArrayRef<ExceptEnt>> XCOFFObjectFile::getExceptionEntries() const { |
| 1029 | assert((is64Bit() && sizeof(ExceptEnt) == sizeof(ExceptionSectionEntry64)) ||(static_cast <bool> ((is64Bit() && sizeof(ExceptEnt ) == sizeof(ExceptionSectionEntry64)) || (!is64Bit() && sizeof(ExceptEnt) == sizeof(ExceptionSectionEntry32))) ? void (0) : __assert_fail ("(is64Bit() && sizeof(ExceptEnt) == sizeof(ExceptionSectionEntry64)) || (!is64Bit() && sizeof(ExceptEnt) == sizeof(ExceptionSectionEntry32))" , "llvm/lib/Object/XCOFFObjectFile.cpp", 1030, __extension__ __PRETTY_FUNCTION__ )) |
| 1030 | (!is64Bit() && sizeof(ExceptEnt) == sizeof(ExceptionSectionEntry32)))(static_cast <bool> ((is64Bit() && sizeof(ExceptEnt ) == sizeof(ExceptionSectionEntry64)) || (!is64Bit() && sizeof(ExceptEnt) == sizeof(ExceptionSectionEntry32))) ? void (0) : __assert_fail ("(is64Bit() && sizeof(ExceptEnt) == sizeof(ExceptionSectionEntry64)) || (!is64Bit() && sizeof(ExceptEnt) == sizeof(ExceptionSectionEntry32))" , "llvm/lib/Object/XCOFFObjectFile.cpp", 1030, __extension__ __PRETTY_FUNCTION__ )); |
| 1031 | |
| 1032 | Expected<uintptr_t> ExceptionSectOrErr = |
| 1033 | getSectionFileOffsetToRawData(XCOFF::STYP_EXCEPT); |
| 1034 | if (!ExceptionSectOrErr) |
| 1035 | return ExceptionSectOrErr.takeError(); |
| 1036 | |
| 1037 | DataRefImpl DRI = getSectionByType(XCOFF::STYP_EXCEPT); |
| 1038 | if (DRI.p == 0) |
| 1039 | return ArrayRef<ExceptEnt>(); |
| 1040 | |
| 1041 | ExceptEnt *ExceptEntStart = |
| 1042 | reinterpret_cast<ExceptEnt *>(*ExceptionSectOrErr); |
| 1043 | return ArrayRef<ExceptEnt>( |
| 1044 | ExceptEntStart, ExceptEntStart + getSectionSize(DRI) / sizeof(ExceptEnt)); |
| 1045 | } |
| 1046 | |
| 1047 | template Expected<ArrayRef<ExceptionSectionEntry32>> |
| 1048 | XCOFFObjectFile::getExceptionEntries() const; |
| 1049 | template Expected<ArrayRef<ExceptionSectionEntry64>> |
| 1050 | XCOFFObjectFile::getExceptionEntries() const; |
| 1051 | |
| 1052 | Expected<XCOFFStringTable> |
| 1053 | XCOFFObjectFile::parseStringTable(const XCOFFObjectFile *Obj, uint64_t Offset) { |
| 1054 | // If there is a string table, then the buffer must contain at least 4 bytes |
| 1055 | // for the string table's size. Not having a string table is not an error. |
| 1056 | if (Error E = Binary::checkOffset( |
| 1057 | Obj->Data, reinterpret_cast<uintptr_t>(Obj->base() + Offset), 4)) { |
| 1058 | consumeError(std::move(E)); |
| 1059 | return XCOFFStringTable{0, nullptr}; |
| 1060 | } |
| 1061 | |
| 1062 | // Read the size out of the buffer. |
| 1063 | uint32_t Size = support::endian::read32be(Obj->base() + Offset); |
| 1064 | |
| 1065 | // If the size is less then 4, then the string table is just a size and no |
| 1066 | // string data. |
| 1067 | if (Size <= 4) |
| 1068 | return XCOFFStringTable{4, nullptr}; |
| 1069 | |
| 1070 | auto StringTableOrErr = |
| 1071 | getObject<char>(Obj->Data, Obj->base() + Offset, Size); |
| 1072 | if (!StringTableOrErr) |
| 1073 | return createError(toString(StringTableOrErr.takeError()) + |
| 1074 | ": string table with offset 0x" + |
| 1075 | Twine::utohexstr(Offset) + " and size 0x" + |
| 1076 | Twine::utohexstr(Size) + |
| 1077 | " goes past the end of the file"); |
| 1078 | |
| 1079 | const char *StringTablePtr = StringTableOrErr.get(); |
| 1080 | if (StringTablePtr[Size - 1] != '\0') |
| 1081 | return errorCodeToError(object_error::string_table_non_null_end); |
| 1082 | |
| 1083 | return XCOFFStringTable{Size, StringTablePtr}; |
| 1084 | } |
| 1085 | |
| 1086 | // This function returns the import file table. Each entry in the import file |
| 1087 | // table consists of: "path_name\0base_name\0archive_member_name\0". |
| 1088 | Expected<StringRef> XCOFFObjectFile::getImportFileTable() const { |
| 1089 | Expected<uintptr_t> LoaderSectionAddrOrError = |
| 1090 | getSectionFileOffsetToRawData(XCOFF::STYP_LOADER); |
| 1091 | if (!LoaderSectionAddrOrError) |
| 1092 | return LoaderSectionAddrOrError.takeError(); |
| 1093 | |
| 1094 | uintptr_t LoaderSectionAddr = LoaderSectionAddrOrError.get(); |
| 1095 | if (!LoaderSectionAddr) |
| 1096 | return StringRef(); |
| 1097 | |
| 1098 | uint64_t OffsetToImportFileTable = 0; |
| 1099 | uint64_t LengthOfImportFileTable = 0; |
| 1100 | if (is64Bit()) { |
| 1101 | const LoaderSectionHeader64 *LoaderSec64 = |
| 1102 | viewAs<LoaderSectionHeader64>(LoaderSectionAddr); |
| 1103 | OffsetToImportFileTable = LoaderSec64->OffsetToImpid; |
| 1104 | LengthOfImportFileTable = LoaderSec64->LengthOfImpidStrTbl; |
| 1105 | } else { |
| 1106 | const LoaderSectionHeader32 *LoaderSec32 = |
| 1107 | viewAs<LoaderSectionHeader32>(LoaderSectionAddr); |
| 1108 | OffsetToImportFileTable = LoaderSec32->OffsetToImpid; |
| 1109 | LengthOfImportFileTable = LoaderSec32->LengthOfImpidStrTbl; |
| 1110 | } |
| 1111 | |
| 1112 | auto ImportTableOrErr = getObject<char>( |
| 1113 | Data, |
| 1114 | reinterpret_cast<void *>(LoaderSectionAddr + OffsetToImportFileTable), |
| 1115 | LengthOfImportFileTable); |
| 1116 | if (!ImportTableOrErr) |
| 1117 | return createError( |
| 1118 | toString(ImportTableOrErr.takeError()) + |
| 1119 | ": import file table with offset 0x" + |
| 1120 | Twine::utohexstr(LoaderSectionAddr + OffsetToImportFileTable) + |
| 1121 | " and size 0x" + Twine::utohexstr(LengthOfImportFileTable) + |
| 1122 | " goes past the end of the file"); |
| 1123 | |
| 1124 | const char *ImportTablePtr = ImportTableOrErr.get(); |
| 1125 | if (ImportTablePtr[LengthOfImportFileTable - 1] != '\0') |
| 1126 | return createError( |
| 1127 | ": import file name table with offset 0x" + |
| 1128 | Twine::utohexstr(LoaderSectionAddr + OffsetToImportFileTable) + |
| 1129 | " and size 0x" + Twine::utohexstr(LengthOfImportFileTable) + |
| 1130 | " must end with a null terminator"); |
| 1131 | |
| 1132 | return StringRef(ImportTablePtr, LengthOfImportFileTable); |
| 1133 | } |
| 1134 | |
| 1135 | Expected<std::unique_ptr<XCOFFObjectFile>> |
| 1136 | XCOFFObjectFile::create(unsigned Type, MemoryBufferRef MBR) { |
| 1137 | // Can't use std::make_unique because of the private constructor. |
| 1138 | std::unique_ptr<XCOFFObjectFile> Obj; |
| 1139 | Obj.reset(new XCOFFObjectFile(Type, MBR)); |
| 1140 | |
| 1141 | uint64_t CurOffset = 0; |
| 1142 | const auto *Base = Obj->base(); |
| 1143 | MemoryBufferRef Data = Obj->Data; |
| 1144 | |
| 1145 | // Parse file header. |
| 1146 | auto FileHeaderOrErr = |
| 1147 | getObject<void>(Data, Base + CurOffset, Obj->getFileHeaderSize()); |
| 1148 | if (Error E = FileHeaderOrErr.takeError()) |
| 1149 | return std::move(E); |
| 1150 | Obj->FileHeader = FileHeaderOrErr.get(); |
| 1151 | |
| 1152 | CurOffset += Obj->getFileHeaderSize(); |
| 1153 | |
| 1154 | if (Obj->getOptionalHeaderSize()) { |
| 1155 | auto AuxiliaryHeaderOrErr = |
| 1156 | getObject<void>(Data, Base + CurOffset, Obj->getOptionalHeaderSize()); |
| 1157 | if (Error E = AuxiliaryHeaderOrErr.takeError()) |
| 1158 | return std::move(E); |
| 1159 | Obj->AuxiliaryHeader = AuxiliaryHeaderOrErr.get(); |
| 1160 | } |
| 1161 | |
| 1162 | CurOffset += Obj->getOptionalHeaderSize(); |
| 1163 | |
| 1164 | // Parse the section header table if it is present. |
| 1165 | if (Obj->getNumberOfSections()) { |
| 1166 | uint64_t SectionHeadersSize = |
| 1167 | Obj->getNumberOfSections() * Obj->getSectionHeaderSize(); |
| 1168 | auto SecHeadersOrErr = |
| 1169 | getObject<void>(Data, Base + CurOffset, SectionHeadersSize); |
| 1170 | if (!SecHeadersOrErr) |
| 1171 | return createError(toString(SecHeadersOrErr.takeError()) + |
| 1172 | ": section headers with offset 0x" + |
| 1173 | Twine::utohexstr(CurOffset) + " and size 0x" + |
| 1174 | Twine::utohexstr(SectionHeadersSize) + |
| 1175 | " go past the end of the file"); |
| 1176 | |
| 1177 | Obj->SectionHeaderTable = SecHeadersOrErr.get(); |
| 1178 | } |
| 1179 | |
| 1180 | const uint32_t NumberOfSymbolTableEntries = |
| 1181 | Obj->getNumberOfSymbolTableEntries(); |
| 1182 | |
| 1183 | // If there is no symbol table we are done parsing the memory buffer. |
| 1184 | if (NumberOfSymbolTableEntries == 0) |
| 1185 | return std::move(Obj); |
| 1186 | |
| 1187 | // Parse symbol table. |
| 1188 | CurOffset = Obj->is64Bit() ? Obj->getSymbolTableOffset64() |
| 1189 | : Obj->getSymbolTableOffset32(); |
| 1190 | const uint64_t SymbolTableSize = |
| 1191 | static_cast<uint64_t>(XCOFF::SymbolTableEntrySize) * |
| 1192 | NumberOfSymbolTableEntries; |
| 1193 | auto SymTableOrErr = |
| 1194 | getObject<void *>(Data, Base + CurOffset, SymbolTableSize); |
| 1195 | if (!SymTableOrErr) |
| 1196 | return createError( |
| 1197 | toString(SymTableOrErr.takeError()) + ": symbol table with offset 0x" + |
| 1198 | Twine::utohexstr(CurOffset) + " and size 0x" + |
| 1199 | Twine::utohexstr(SymbolTableSize) + " goes past the end of the file"); |
| 1200 | |
| 1201 | Obj->SymbolTblPtr = SymTableOrErr.get(); |
| 1202 | CurOffset += SymbolTableSize; |
| 1203 | |
| 1204 | // Parse String table. |
| 1205 | Expected<XCOFFStringTable> StringTableOrErr = |
| 1206 | parseStringTable(Obj.get(), CurOffset); |
| 1207 | if (Error E = StringTableOrErr.takeError()) |
| 1208 | return std::move(E); |
| 1209 | Obj->StringTable = StringTableOrErr.get(); |
| 1210 | |
| 1211 | return std::move(Obj); |
| 1212 | } |
| 1213 | |
| 1214 | Expected<std::unique_ptr<ObjectFile>> |
| 1215 | ObjectFile::createXCOFFObjectFile(MemoryBufferRef MemBufRef, |
| 1216 | unsigned FileType) { |
| 1217 | return XCOFFObjectFile::create(FileType, MemBufRef); |
| 1218 | } |
| 1219 | |
| 1220 | bool XCOFFSymbolRef::isFunction() const { |
| 1221 | if (!isCsectSymbol()) |
| 1222 | return false; |
| 1223 | |
| 1224 | if (getSymbolType() & FunctionSym) |
| 1225 | return true; |
| 1226 | |
| 1227 | Expected<XCOFFCsectAuxRef> ExpCsectAuxEnt = getXCOFFCsectAuxRef(); |
| 1228 | if (!ExpCsectAuxEnt) { |
| 1229 | // If we could not get the CSECT auxiliary entry, then treat this symbol as |
| 1230 | // if it isn't a function. Consume the error and return `false` to move on. |
| 1231 | consumeError(ExpCsectAuxEnt.takeError()); |
| 1232 | return false; |
| 1233 | } |
| 1234 | |
| 1235 | const XCOFFCsectAuxRef CsectAuxRef = ExpCsectAuxEnt.get(); |
| 1236 | |
| 1237 | // A function definition should be a label definition. |
| 1238 | // FIXME: This is not necessarily the case when -ffunction-sections is |
| 1239 | // enabled. |
| 1240 | if (!CsectAuxRef.isLabel()) |
| 1241 | return false; |
| 1242 | |
| 1243 | if (CsectAuxRef.getStorageMappingClass() != XCOFF::XMC_PR) |
| 1244 | return false; |
| 1245 | |
| 1246 | const int16_t SectNum = getSectionNumber(); |
| 1247 | Expected<DataRefImpl> SI = OwningObjectPtr->getSectionByNum(SectNum); |
| 1248 | if (!SI) { |
| 1249 | // If we could not get the section, then this symbol should not be |
| 1250 | // a function. So consume the error and return `false` to move on. |
| 1251 | consumeError(SI.takeError()); |
| 1252 | return false; |
| 1253 | } |
| 1254 | |
| 1255 | return (OwningObjectPtr->getSectionFlags(SI.get()) & XCOFF::STYP_TEXT); |
| 1256 | } |
| 1257 | |
| 1258 | bool XCOFFSymbolRef::isCsectSymbol() const { |
| 1259 | XCOFF::StorageClass SC = getStorageClass(); |
| 1260 | return (SC == XCOFF::C_EXT || SC == XCOFF::C_WEAKEXT || |
| 1261 | SC == XCOFF::C_HIDEXT); |
| 1262 | } |
| 1263 | |
| 1264 | Expected<XCOFFCsectAuxRef> XCOFFSymbolRef::getXCOFFCsectAuxRef() const { |
| 1265 | assert(isCsectSymbol() &&(static_cast <bool> (isCsectSymbol() && "Calling csect symbol interface with a non-csect symbol." ) ? void (0) : __assert_fail ("isCsectSymbol() && \"Calling csect symbol interface with a non-csect symbol.\"" , "llvm/lib/Object/XCOFFObjectFile.cpp", 1266, __extension__ __PRETTY_FUNCTION__ )) |
| 1266 | "Calling csect symbol interface with a non-csect symbol.")(static_cast <bool> (isCsectSymbol() && "Calling csect symbol interface with a non-csect symbol." ) ? void (0) : __assert_fail ("isCsectSymbol() && \"Calling csect symbol interface with a non-csect symbol.\"" , "llvm/lib/Object/XCOFFObjectFile.cpp", 1266, __extension__ __PRETTY_FUNCTION__ )); |
| 1267 | |
| 1268 | uint8_t NumberOfAuxEntries = getNumberOfAuxEntries(); |
| 1269 | |
| 1270 | Expected<StringRef> NameOrErr = getName(); |
| 1271 | if (auto Err = NameOrErr.takeError()) |
| 1272 | return std::move(Err); |
| 1273 | |
| 1274 | uint32_t SymbolIdx = OwningObjectPtr->getSymbolIndex(getEntryAddress()); |
| 1275 | if (!NumberOfAuxEntries) { |
| 1276 | return createError("csect symbol \"" + *NameOrErr + "\" with index " + |
| 1277 | Twine(SymbolIdx) + " contains no auxiliary entry"); |
| 1278 | } |
| 1279 | |
| 1280 | if (!OwningObjectPtr->is64Bit()) { |
| 1281 | // In XCOFF32, the csect auxilliary entry is always the last auxiliary |
| 1282 | // entry for the symbol. |
| 1283 | uintptr_t AuxAddr = XCOFFObjectFile::getAdvancedSymbolEntryAddress( |
| 1284 | getEntryAddress(), NumberOfAuxEntries); |
| 1285 | return XCOFFCsectAuxRef(viewAs<XCOFFCsectAuxEnt32>(AuxAddr)); |
| 1286 | } |
| 1287 | |
| 1288 | // XCOFF64 uses SymbolAuxType to identify the auxiliary entry type. |
| 1289 | // We need to iterate through all the auxiliary entries to find it. |
| 1290 | for (uint8_t Index = NumberOfAuxEntries; Index > 0; --Index) { |
| 1291 | uintptr_t AuxAddr = XCOFFObjectFile::getAdvancedSymbolEntryAddress( |
| 1292 | getEntryAddress(), Index); |
| 1293 | if (*OwningObjectPtr->getSymbolAuxType(AuxAddr) == |
| 1294 | XCOFF::SymbolAuxType::AUX_CSECT) { |
| 1295 | #ifndef NDEBUG |
| 1296 | OwningObjectPtr->checkSymbolEntryPointer(AuxAddr); |
| 1297 | #endif |
| 1298 | return XCOFFCsectAuxRef(viewAs<XCOFFCsectAuxEnt64>(AuxAddr)); |
| 1299 | } |
| 1300 | } |
| 1301 | |
| 1302 | return createError( |
| 1303 | "a csect auxiliary entry has not been found for symbol \"" + *NameOrErr + |
| 1304 | "\" with index " + Twine(SymbolIdx)); |
| 1305 | } |
| 1306 | |
| 1307 | Expected<StringRef> XCOFFSymbolRef::getName() const { |
| 1308 | // A storage class value with the high-order bit on indicates that the name is |
| 1309 | // a symbolic debugger stabstring. |
| 1310 | if (getStorageClass() & 0x80) |
| 1311 | return StringRef("Unimplemented Debug Name"); |
| 1312 | |
| 1313 | if (Entry32) { |
| 1314 | if (Entry32->NameInStrTbl.Magic != XCOFFSymbolRef::NAME_IN_STR_TBL_MAGIC) |
| 1315 | return generateXCOFFFixedNameStringRef(Entry32->SymbolName); |
| 1316 | |
| 1317 | return OwningObjectPtr->getStringTableEntry(Entry32->NameInStrTbl.Offset); |
| 1318 | } |
| 1319 | |
| 1320 | return OwningObjectPtr->getStringTableEntry(Entry64->Offset); |
| 1321 | } |
| 1322 | |
| 1323 | // Explictly instantiate template classes. |
| 1324 | template struct XCOFFSectionHeader<XCOFFSectionHeader32>; |
| 1325 | template struct XCOFFSectionHeader<XCOFFSectionHeader64>; |
| 1326 | |
| 1327 | template struct XCOFFRelocation<llvm::support::ubig32_t>; |
| 1328 | template struct XCOFFRelocation<llvm::support::ubig64_t>; |
| 1329 | |
| 1330 | template llvm::Expected<llvm::ArrayRef<llvm::object::XCOFFRelocation64>> |
| 1331 | llvm::object::XCOFFObjectFile::relocations<llvm::object::XCOFFSectionHeader64, |
| 1332 | llvm::object::XCOFFRelocation64>( |
| 1333 | llvm::object::XCOFFSectionHeader64 const &) const; |
| 1334 | template llvm::Expected<llvm::ArrayRef<llvm::object::XCOFFRelocation32>> |
| 1335 | llvm::object::XCOFFObjectFile::relocations<llvm::object::XCOFFSectionHeader32, |
| 1336 | llvm::object::XCOFFRelocation32>( |
| 1337 | llvm::object::XCOFFSectionHeader32 const &) const; |
| 1338 | |
| 1339 | bool doesXCOFFTracebackTableBegin(ArrayRef<uint8_t> Bytes) { |
| 1340 | if (Bytes.size() < 4) |
| 1341 | return false; |
| 1342 | |
| 1343 | return support::endian::read32be(Bytes.data()) == 0; |
| 1344 | } |
| 1345 | |
| 1346 | #define GETVALUEWITHMASK(X) (Data & (TracebackTable::X)) |
| 1347 | #define GETVALUEWITHMASKSHIFT(X, S) \ |
| 1348 | ((Data & (TracebackTable::X)) >> (TracebackTable::S)) |
| 1349 | |
| 1350 | Expected<TBVectorExt> TBVectorExt::create(StringRef TBvectorStrRef) { |
| 1351 | Error Err = Error::success(); |
| 1352 | TBVectorExt TBTVecExt(TBvectorStrRef, Err); |
| 1353 | if (Err) |
| 1354 | return std::move(Err); |
| 1355 | return TBTVecExt; |
| 1356 | } |
| 1357 | |
| 1358 | TBVectorExt::TBVectorExt(StringRef TBvectorStrRef, Error &Err) { |
| 1359 | const uint8_t *Ptr = reinterpret_cast<const uint8_t *>(TBvectorStrRef.data()); |
| 1360 | Data = support::endian::read16be(Ptr); |
| 1361 | uint32_t VecParmsTypeValue = support::endian::read32be(Ptr + 2); |
| 1362 | unsigned ParmsNum = |
| 1363 | GETVALUEWITHMASKSHIFT(NumberOfVectorParmsMask, NumberOfVectorParmsShift); |
| 1364 | |
| 1365 | ErrorAsOutParameter EAO(&Err); |
| 1366 | Expected<SmallString<32>> VecParmsTypeOrError = |
| 1367 | parseVectorParmsType(VecParmsTypeValue, ParmsNum); |
| 1368 | if (!VecParmsTypeOrError) |
| 1369 | Err = VecParmsTypeOrError.takeError(); |
| 1370 | else |
| 1371 | VecParmsInfo = VecParmsTypeOrError.get(); |
| 1372 | } |
| 1373 | |
| 1374 | uint8_t TBVectorExt::getNumberOfVRSaved() const { |
| 1375 | return GETVALUEWITHMASKSHIFT(NumberOfVRSavedMask, NumberOfVRSavedShift); |
| 1376 | } |
| 1377 | |
| 1378 | bool TBVectorExt::isVRSavedOnStack() const { |
| 1379 | return GETVALUEWITHMASK(IsVRSavedOnStackMask); |
| 1380 | } |
| 1381 | |
| 1382 | bool TBVectorExt::hasVarArgs() const { |
| 1383 | return GETVALUEWITHMASK(HasVarArgsMask); |
| 1384 | } |
| 1385 | |
| 1386 | uint8_t TBVectorExt::getNumberOfVectorParms() const { |
| 1387 | return GETVALUEWITHMASKSHIFT(NumberOfVectorParmsMask, |
| 1388 | NumberOfVectorParmsShift); |
| 1389 | } |
| 1390 | |
| 1391 | bool TBVectorExt::hasVMXInstruction() const { |
| 1392 | return GETVALUEWITHMASK(HasVMXInstructionMask); |
| 1393 | } |
| 1394 | #undef GETVALUEWITHMASK |
| 1395 | #undef GETVALUEWITHMASKSHIFT |
| 1396 | |
| 1397 | Expected<XCOFFTracebackTable> XCOFFTracebackTable::create(const uint8_t *Ptr, |
| 1398 | uint64_t &Size) { |
| 1399 | Error Err = Error::success(); |
| 1400 | XCOFFTracebackTable TBT(Ptr, Size, Err); |
| 1401 | if (Err) |
| 1402 | return std::move(Err); |
| 1403 | return TBT; |
| 1404 | } |
| 1405 | |
| 1406 | XCOFFTracebackTable::XCOFFTracebackTable(const uint8_t *Ptr, uint64_t &Size, |
| 1407 | Error &Err) |
| 1408 | : TBPtr(Ptr) { |
| 1409 | ErrorAsOutParameter EAO(&Err); |
| 1410 | DataExtractor DE(ArrayRef<uint8_t>(Ptr, Size), /*IsLittleEndian=*/false, |
| 1411 | /*AddressSize=*/0); |
| 1412 | DataExtractor::Cursor Cur(/*Offset=*/0); |
| 1413 | |
| 1414 | // Skip 8 bytes of mandatory fields. |
| 1415 | DE.getU64(Cur); |
| 1416 | |
| 1417 | unsigned FixedParmsNum = getNumberOfFixedParms(); |
| 1418 | unsigned FloatingParmsNum = getNumberOfFPParms(); |
| 1419 | uint32_t ParamsTypeValue = 0; |
| 1420 | |
| 1421 | // Begin to parse optional fields. |
| 1422 | if (Cur && (FixedParmsNum + FloatingParmsNum) > 0) |
| 1423 | ParamsTypeValue = DE.getU32(Cur); |
| 1424 | |
| 1425 | if (Cur && hasTraceBackTableOffset()) |
| 1426 | TraceBackTableOffset = DE.getU32(Cur); |
| 1427 | |
| 1428 | if (Cur && isInterruptHandler()) |
| 1429 | HandlerMask = DE.getU32(Cur); |
| 1430 | |
| 1431 | if (Cur && hasControlledStorage()) { |
| 1432 | NumOfCtlAnchors = DE.getU32(Cur); |
| 1433 | if (Cur && NumOfCtlAnchors) { |
| 1434 | SmallVector<uint32_t, 8> Disp; |
| 1435 | Disp.reserve(*NumOfCtlAnchors); |
| 1436 | for (uint32_t I = 0; I < NumOfCtlAnchors && Cur; ++I) |
| 1437 | Disp.push_back(DE.getU32(Cur)); |
| 1438 | if (Cur) |
| 1439 | ControlledStorageInfoDisp = std::move(Disp); |
| 1440 | } |
| 1441 | } |
| 1442 | |
| 1443 | if (Cur && isFuncNamePresent()) { |
| 1444 | uint16_t FunctionNameLen = DE.getU16(Cur); |
| 1445 | if (Cur) |
| 1446 | FunctionName = DE.getBytes(Cur, FunctionNameLen); |
| 1447 | } |
| 1448 | |
| 1449 | if (Cur && isAllocaUsed()) |
| 1450 | AllocaRegister = DE.getU8(Cur); |
| 1451 | |
| 1452 | unsigned VectorParmsNum = 0; |
| 1453 | if (Cur && hasVectorInfo()) { |
| 1454 | StringRef VectorExtRef = DE.getBytes(Cur, 6); |
| 1455 | if (Cur) { |
| 1456 | Expected<TBVectorExt> TBVecExtOrErr = TBVectorExt::create(VectorExtRef); |
| 1457 | if (!TBVecExtOrErr) { |
| 1458 | Err = TBVecExtOrErr.takeError(); |
| 1459 | return; |
| 1460 | } |
| 1461 | VecExt = TBVecExtOrErr.get(); |
| 1462 | VectorParmsNum = VecExt->getNumberOfVectorParms(); |
| 1463 | } |
| 1464 | } |
| 1465 | |
| 1466 | // As long as there is no fixed-point or floating-point parameter, this |
| 1467 | // field remains not present even when hasVectorInfo gives true and |
| 1468 | // indicates the presence of vector parameters. |
| 1469 | if (Cur && (FixedParmsNum + FloatingParmsNum) > 0) { |
| 1470 | Expected<SmallString<32>> ParmsTypeOrError = |
| 1471 | hasVectorInfo() |
| 1472 | ? parseParmsTypeWithVecInfo(ParamsTypeValue, FixedParmsNum, |
| 1473 | FloatingParmsNum, VectorParmsNum) |
| 1474 | : parseParmsType(ParamsTypeValue, FixedParmsNum, FloatingParmsNum); |
| 1475 | |
| 1476 | if (!ParmsTypeOrError) { |
| 1477 | Err = ParmsTypeOrError.takeError(); |
| 1478 | return; |
| 1479 | } |
| 1480 | ParmsType = ParmsTypeOrError.get(); |
| 1481 | } |
| 1482 | |
| 1483 | if (Cur && hasExtensionTable()) |
| 1484 | ExtensionTable = DE.getU8(Cur); |
| 1485 | |
| 1486 | if (!Cur) |
| 1487 | Err = Cur.takeError(); |
| 1488 | |
| 1489 | Size = Cur.tell(); |
| 1490 | } |
| 1491 | |
| 1492 | #define GETBITWITHMASK(P, X) \ |
| 1493 | (support::endian::read32be(TBPtr + (P)) & (TracebackTable::X)) |
| 1494 | #define GETBITWITHMASKSHIFT(P, X, S) \ |
| 1495 | ((support::endian::read32be(TBPtr + (P)) & (TracebackTable::X)) >> \ |
| 1496 | (TracebackTable::S)) |
| 1497 | |
| 1498 | uint8_t XCOFFTracebackTable::getVersion() const { |
| 1499 | return GETBITWITHMASKSHIFT(0, VersionMask, VersionShift); |
| 1500 | } |
| 1501 | |
| 1502 | uint8_t XCOFFTracebackTable::getLanguageID() const { |
| 1503 | return GETBITWITHMASKSHIFT(0, LanguageIdMask, LanguageIdShift); |
| 1504 | } |
| 1505 | |
| 1506 | bool XCOFFTracebackTable::isGlobalLinkage() const { |
| 1507 | return GETBITWITHMASK(0, IsGlobaLinkageMask); |
| 1508 | } |
| 1509 | |
| 1510 | bool XCOFFTracebackTable::isOutOfLineEpilogOrPrologue() const { |
| 1511 | return GETBITWITHMASK(0, IsOutOfLineEpilogOrPrologueMask); |
| 1512 | } |
| 1513 | |
| 1514 | bool XCOFFTracebackTable::hasTraceBackTableOffset() const { |
| 1515 | return GETBITWITHMASK(0, HasTraceBackTableOffsetMask); |
| 1516 | } |
| 1517 | |
| 1518 | bool XCOFFTracebackTable::isInternalProcedure() const { |
| 1519 | return GETBITWITHMASK(0, IsInternalProcedureMask); |
| 1520 | } |
| 1521 | |
| 1522 | bool XCOFFTracebackTable::hasControlledStorage() const { |
| 1523 | return GETBITWITHMASK(0, HasControlledStorageMask); |
| 1524 | } |
| 1525 | |
| 1526 | bool XCOFFTracebackTable::isTOCless() const { |
| 1527 | return GETBITWITHMASK(0, IsTOClessMask); |
| 1528 | } |
| 1529 | |
| 1530 | bool XCOFFTracebackTable::isFloatingPointPresent() const { |
| 1531 | return GETBITWITHMASK(0, IsFloatingPointPresentMask); |
| 1532 | } |
| 1533 | |
| 1534 | bool XCOFFTracebackTable::isFloatingPointOperationLogOrAbortEnabled() const { |
| 1535 | return GETBITWITHMASK(0, IsFloatingPointOperationLogOrAbortEnabledMask); |
| 1536 | } |
| 1537 | |
| 1538 | bool XCOFFTracebackTable::isInterruptHandler() const { |
| 1539 | return GETBITWITHMASK(0, IsInterruptHandlerMask); |
| 1540 | } |
| 1541 | |
| 1542 | bool XCOFFTracebackTable::isFuncNamePresent() const { |
| 1543 | return GETBITWITHMASK(0, IsFunctionNamePresentMask); |
| 1544 | } |
| 1545 | |
| 1546 | bool XCOFFTracebackTable::isAllocaUsed() const { |
| 1547 | return GETBITWITHMASK(0, IsAllocaUsedMask); |
| 1548 | } |
| 1549 | |
| 1550 | uint8_t XCOFFTracebackTable::getOnConditionDirective() const { |
| 1551 | return GETBITWITHMASKSHIFT(0, OnConditionDirectiveMask, |
| 1552 | OnConditionDirectiveShift); |
| 1553 | } |
| 1554 | |
| 1555 | bool XCOFFTracebackTable::isCRSaved() const { |
| 1556 | return GETBITWITHMASK(0, IsCRSavedMask); |
| 1557 | } |
| 1558 | |
| 1559 | bool XCOFFTracebackTable::isLRSaved() const { |
| 1560 | return GETBITWITHMASK(0, IsLRSavedMask); |
| 1561 | } |
| 1562 | |
| 1563 | bool XCOFFTracebackTable::isBackChainStored() const { |
| 1564 | return GETBITWITHMASK(4, IsBackChainStoredMask); |
| 1565 | } |
| 1566 | |
| 1567 | bool XCOFFTracebackTable::isFixup() const { |
| 1568 | return GETBITWITHMASK(4, IsFixupMask); |
| 1569 | } |
| 1570 | |
| 1571 | uint8_t XCOFFTracebackTable::getNumOfFPRsSaved() const { |
| 1572 | return GETBITWITHMASKSHIFT(4, FPRSavedMask, FPRSavedShift); |
| 1573 | } |
| 1574 | |
| 1575 | bool XCOFFTracebackTable::hasExtensionTable() const { |
| 1576 | return GETBITWITHMASK(4, HasExtensionTableMask); |
| 1577 | } |
| 1578 | |
| 1579 | bool XCOFFTracebackTable::hasVectorInfo() const { |
| 1580 | return GETBITWITHMASK(4, HasVectorInfoMask); |
| 1581 | } |
| 1582 | |
| 1583 | uint8_t XCOFFTracebackTable::getNumOfGPRsSaved() const { |
| 1584 | return GETBITWITHMASKSHIFT(4, GPRSavedMask, GPRSavedShift); |
| 1585 | } |
| 1586 | |
| 1587 | uint8_t XCOFFTracebackTable::getNumberOfFixedParms() const { |
| 1588 | return GETBITWITHMASKSHIFT(4, NumberOfFixedParmsMask, |
| 1589 | NumberOfFixedParmsShift); |
| 1590 | } |
| 1591 | |
| 1592 | uint8_t XCOFFTracebackTable::getNumberOfFPParms() const { |
| 1593 | return GETBITWITHMASKSHIFT(4, NumberOfFloatingPointParmsMask, |
| 1594 | NumberOfFloatingPointParmsShift); |
| 1595 | } |
| 1596 | |
| 1597 | bool XCOFFTracebackTable::hasParmsOnStack() const { |
| 1598 | return GETBITWITHMASK(4, HasParmsOnStackMask); |
| 1599 | } |
| 1600 | |
| 1601 | #undef GETBITWITHMASK |
| 1602 | #undef GETBITWITHMASKSHIFT |
| 1603 | } // namespace object |
| 1604 | } // namespace llvm |