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clang-p2996/lld/lib/ReaderWriter/MachO/MachONormalizedFileToAtoms.cpp
Pete Cooper ebecd6c543 Fix EHFrame processing to add implicit references when needed. 
The current code for processCIE and processFDE returns out if it sees
any references.  The problem with this is that some references could be
explicit in the binary, while others are implicit as they can be
inferred from the content of the EHFrame itself.

This change walks the references we have against the references we
need, and verifies that all explicit references are in the correct place,
and generates any missing implicit ones.

Reviewed by Lang Hames and Nick Kledzik.

Differential Revision: http://reviews.llvm.org/D15439

llvm-svn: 263590
2016-03-15 21:33:10 +00:00

1327 lines
54 KiB
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//===- lib/ReaderWriter/MachO/MachONormalizedFileToAtoms.cpp --------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file Converts from in-memory normalized mach-o to in-memory Atoms.
///
/// +------------+
/// | normalized |
/// +------------+
/// |
/// |
/// v
/// +-------+
/// | Atoms |
/// +-------+
#include "MachONormalizedFile.h"
#include "ArchHandler.h"
#include "Atoms.h"
#include "File.h"
#include "MachONormalizedFileBinaryUtils.h"
#include "lld/Core/Error.h"
#include "lld/Core/LLVM.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/MachO.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm::MachO;
using namespace lld::mach_o::normalized;
#define DEBUG_TYPE "normalized-file-to-atoms"
namespace lld {
namespace mach_o {
namespace { // anonymous
#define ENTRY(seg, sect, type, atomType) \
{seg, sect, type, DefinedAtom::atomType }
struct MachORelocatableSectionToAtomType {
StringRef segmentName;
StringRef sectionName;
SectionType sectionType;
DefinedAtom::ContentType atomType;
};
const MachORelocatableSectionToAtomType sectsToAtomType[] = {
ENTRY("__TEXT", "__text", S_REGULAR, typeCode),
ENTRY("__TEXT", "__text", S_REGULAR, typeResolver),
ENTRY("__TEXT", "__cstring", S_CSTRING_LITERALS, typeCString),
ENTRY("", "", S_CSTRING_LITERALS, typeCString),
ENTRY("__TEXT", "__ustring", S_REGULAR, typeUTF16String),
ENTRY("__TEXT", "__const", S_REGULAR, typeConstant),
ENTRY("__TEXT", "__const_coal", S_COALESCED, typeConstant),
ENTRY("__TEXT", "__eh_frame", S_COALESCED, typeCFI),
ENTRY("__TEXT", "__eh_frame", S_REGULAR, typeCFI),
ENTRY("__TEXT", "__literal4", S_4BYTE_LITERALS, typeLiteral4),
ENTRY("__TEXT", "__literal8", S_8BYTE_LITERALS, typeLiteral8),
ENTRY("__TEXT", "__literal16", S_16BYTE_LITERALS, typeLiteral16),
ENTRY("__TEXT", "__gcc_except_tab", S_REGULAR, typeLSDA),
ENTRY("__DATA", "__data", S_REGULAR, typeData),
ENTRY("__DATA", "__datacoal_nt", S_COALESCED, typeData),
ENTRY("__DATA", "__const", S_REGULAR, typeConstData),
ENTRY("__DATA", "__cfstring", S_REGULAR, typeCFString),
ENTRY("__DATA", "__mod_init_func", S_MOD_INIT_FUNC_POINTERS,
typeInitializerPtr),
ENTRY("__DATA", "__mod_term_func", S_MOD_TERM_FUNC_POINTERS,
typeTerminatorPtr),
ENTRY("__DATA", "__got", S_NON_LAZY_SYMBOL_POINTERS,
typeGOT),
ENTRY("__DATA", "__bss", S_ZEROFILL, typeZeroFill),
ENTRY("", "", S_NON_LAZY_SYMBOL_POINTERS,
typeGOT),
ENTRY("__DATA", "__interposing", S_INTERPOSING, typeInterposingTuples),
ENTRY("__DATA", "__thread_vars", S_THREAD_LOCAL_VARIABLES,
typeThunkTLV),
ENTRY("__DATA", "__thread_data", S_THREAD_LOCAL_REGULAR, typeTLVInitialData),
ENTRY("__DATA", "__thread_bss", S_THREAD_LOCAL_ZEROFILL,
typeTLVInitialZeroFill),
ENTRY("__DATA", "__objc_imageinfo", S_REGULAR, typeObjCImageInfo),
ENTRY("__DATA", "__objc_catlist", S_REGULAR, typeObjC2CategoryList),
ENTRY("", "", S_INTERPOSING, typeInterposingTuples),
ENTRY("__LD", "__compact_unwind", S_REGULAR,
typeCompactUnwindInfo),
ENTRY("", "", S_REGULAR, typeUnknown)
};
#undef ENTRY
/// Figures out ContentType of a mach-o section.
DefinedAtom::ContentType atomTypeFromSection(const Section &section,
bool &customSectionName) {
// First look for match of name and type. Empty names in table are wildcards.
customSectionName = false;
for (const MachORelocatableSectionToAtomType *p = sectsToAtomType ;
p->atomType != DefinedAtom::typeUnknown; ++p) {
if (p->sectionType != section.type)
continue;
if (!p->segmentName.equals(section.segmentName) && !p->segmentName.empty())
continue;
if (!p->sectionName.equals(section.sectionName) && !p->sectionName.empty())
continue;
customSectionName = p->segmentName.empty() && p->sectionName.empty();
return p->atomType;
}
// Look for code denoted by section attributes
if (section.attributes & S_ATTR_PURE_INSTRUCTIONS)
return DefinedAtom::typeCode;
return DefinedAtom::typeUnknown;
}
enum AtomizeModel {
atomizeAtSymbols,
atomizeFixedSize,
atomizePointerSize,
atomizeUTF8,
atomizeUTF16,
atomizeCFI,
atomizeCU,
atomizeCFString
};
/// Returns info on how to atomize a section of the specified ContentType.
void sectionParseInfo(DefinedAtom::ContentType atomType,
unsigned int &sizeMultiple,
DefinedAtom::Scope &scope,
DefinedAtom::Merge &merge,
AtomizeModel &atomizeModel) {
struct ParseInfo {
DefinedAtom::ContentType atomType;
unsigned int sizeMultiple;
DefinedAtom::Scope scope;
DefinedAtom::Merge merge;
AtomizeModel atomizeModel;
};
#define ENTRY(type, size, scope, merge, model) \
{DefinedAtom::type, size, DefinedAtom::scope, DefinedAtom::merge, model }
static const ParseInfo parseInfo[] = {
ENTRY(typeCode, 1, scopeGlobal, mergeNo,
atomizeAtSymbols),
ENTRY(typeData, 1, scopeGlobal, mergeNo,
atomizeAtSymbols),
ENTRY(typeConstData, 1, scopeGlobal, mergeNo,
atomizeAtSymbols),
ENTRY(typeZeroFill, 1, scopeGlobal, mergeNo,
atomizeAtSymbols),
ENTRY(typeConstant, 1, scopeGlobal, mergeNo,
atomizeAtSymbols),
ENTRY(typeCString, 1, scopeLinkageUnit, mergeByContent,
atomizeUTF8),
ENTRY(typeUTF16String, 1, scopeLinkageUnit, mergeByContent,
atomizeUTF16),
ENTRY(typeCFI, 4, scopeTranslationUnit, mergeNo,
atomizeCFI),
ENTRY(typeLiteral4, 4, scopeLinkageUnit, mergeByContent,
atomizeFixedSize),
ENTRY(typeLiteral8, 8, scopeLinkageUnit, mergeByContent,
atomizeFixedSize),
ENTRY(typeLiteral16, 16, scopeLinkageUnit, mergeByContent,
atomizeFixedSize),
ENTRY(typeCFString, 4, scopeLinkageUnit, mergeByContent,
atomizeCFString),
ENTRY(typeInitializerPtr, 4, scopeTranslationUnit, mergeNo,
atomizePointerSize),
ENTRY(typeTerminatorPtr, 4, scopeTranslationUnit, mergeNo,
atomizePointerSize),
ENTRY(typeCompactUnwindInfo, 4, scopeTranslationUnit, mergeNo,
atomizeCU),
ENTRY(typeGOT, 4, scopeLinkageUnit, mergeByContent,
atomizePointerSize),
ENTRY(typeObjC2CategoryList, 4, scopeTranslationUnit, mergeByContent,
atomizePointerSize),
ENTRY(typeUnknown, 1, scopeGlobal, mergeNo,
atomizeAtSymbols)
};
#undef ENTRY
const int tableLen = sizeof(parseInfo) / sizeof(ParseInfo);
for (int i=0; i < tableLen; ++i) {
if (parseInfo[i].atomType == atomType) {
sizeMultiple = parseInfo[i].sizeMultiple;
scope = parseInfo[i].scope;
merge = parseInfo[i].merge;
atomizeModel = parseInfo[i].atomizeModel;
return;
}
}
// Unknown type is atomized by symbols.
sizeMultiple = 1;
scope = DefinedAtom::scopeGlobal;
merge = DefinedAtom::mergeNo;
atomizeModel = atomizeAtSymbols;
}
Atom::Scope atomScope(uint8_t scope) {
switch (scope) {
case N_EXT:
return Atom::scopeGlobal;
case N_PEXT:
case N_PEXT | N_EXT:
return Atom::scopeLinkageUnit;
case 0:
return Atom::scopeTranslationUnit;
}
llvm_unreachable("unknown scope value!");
}
void appendSymbolsInSection(const std::vector<Symbol> &inSymbols,
uint32_t sectionIndex,
SmallVector<const Symbol *, 64> &outSyms) {
for (const Symbol &sym : inSymbols) {
// Only look at definition symbols.
if ((sym.type & N_TYPE) != N_SECT)
continue;
if (sym.sect != sectionIndex)
continue;
outSyms.push_back(&sym);
}
}
void atomFromSymbol(DefinedAtom::ContentType atomType, const Section &section,
MachOFile &file, uint64_t symbolAddr, StringRef symbolName,
uint16_t symbolDescFlags, Atom::Scope symbolScope,
uint64_t nextSymbolAddr, bool scatterable, bool copyRefs) {
// Mach-O symbol table does have size in it. Instead the size is the
// difference between this and the next symbol.
uint64_t size = nextSymbolAddr - symbolAddr;
uint64_t offset = symbolAddr - section.address;
bool noDeadStrip = (symbolDescFlags & N_NO_DEAD_STRIP) || !scatterable;
if (isZeroFillSection(section.type)) {
file.addZeroFillDefinedAtom(symbolName, symbolScope, offset, size,
noDeadStrip, copyRefs, &section);
} else {
DefinedAtom::Merge merge = (symbolDescFlags & N_WEAK_DEF)
? DefinedAtom::mergeAsWeak : DefinedAtom::mergeNo;
bool thumb = (symbolDescFlags & N_ARM_THUMB_DEF);
if (atomType == DefinedAtom::typeUnknown) {
// Mach-O needs a segment and section name. Concatentate those two
// with a / separator (e.g. "seg/sect") to fit into the lld model
// of just a section name.
std::string segSectName = section.segmentName.str()
+ "/" + section.sectionName.str();
file.addDefinedAtomInCustomSection(symbolName, symbolScope, atomType,
merge, thumb, noDeadStrip, offset,
size, segSectName, true, &section);
} else {
if ((atomType == lld::DefinedAtom::typeCode) &&
(symbolDescFlags & N_SYMBOL_RESOLVER)) {
atomType = lld::DefinedAtom::typeResolver;
}
file.addDefinedAtom(symbolName, symbolScope, atomType, merge,
offset, size, thumb, noDeadStrip, copyRefs, &section);
}
}
}
std::error_code processSymboledSection(DefinedAtom::ContentType atomType,
const Section &section,
const NormalizedFile &normalizedFile,
MachOFile &file, bool scatterable,
bool copyRefs) {
// Find section's index.
uint32_t sectIndex = 1;
for (auto &sect : normalizedFile.sections) {
if (&sect == &section)
break;
++sectIndex;
}
// Find all symbols in this section.
SmallVector<const Symbol *, 64> symbols;
appendSymbolsInSection(normalizedFile.globalSymbols, sectIndex, symbols);
appendSymbolsInSection(normalizedFile.localSymbols, sectIndex, symbols);
// Sort symbols.
std::sort(symbols.begin(), symbols.end(),
[](const Symbol *lhs, const Symbol *rhs) -> bool {
if (lhs == rhs)
return false;
// First by address.
uint64_t lhsAddr = lhs->value;
uint64_t rhsAddr = rhs->value;
if (lhsAddr != rhsAddr)
return lhsAddr < rhsAddr;
// If same address, one is an alias so sort by scope.
Atom::Scope lScope = atomScope(lhs->scope);
Atom::Scope rScope = atomScope(rhs->scope);
if (lScope != rScope)
return lScope < rScope;
// If same address and scope, see if one might be better as
// the alias.
bool lPrivate = (lhs->name.front() == 'l');
bool rPrivate = (rhs->name.front() == 'l');
if (lPrivate != rPrivate)
return lPrivate;
// If same address and scope, sort by name.
return lhs->name < rhs->name;
});
// Debug logging of symbols.
//for (const Symbol *sym : symbols)
// llvm::errs() << " sym: "
// << llvm::format("0x%08llx ", (uint64_t)sym->value)
// << ", " << sym->name << "\n";
// If section has no symbols and no content, there are no atoms.
if (symbols.empty() && section.content.empty())
return std::error_code();
if (symbols.empty()) {
// Section has no symbols, put all content in one anoymous atom.
atomFromSymbol(atomType, section, file, section.address, StringRef(),
0, Atom::scopeTranslationUnit,
section.address + section.content.size(),
scatterable, copyRefs);
}
else if (symbols.front()->value != section.address) {
// Section has anonymous content before first symbol.
atomFromSymbol(atomType, section, file, section.address, StringRef(),
0, Atom::scopeTranslationUnit, symbols.front()->value,
scatterable, copyRefs);
}
const Symbol *lastSym = nullptr;
for (const Symbol *sym : symbols) {
if (lastSym != nullptr) {
// Ignore any assembler added "ltmpNNN" symbol at start of section
// if there is another symbol at the start.
if ((lastSym->value != sym->value)
|| lastSym->value != section.address
|| !lastSym->name.startswith("ltmp")) {
atomFromSymbol(atomType, section, file, lastSym->value, lastSym->name,
lastSym->desc, atomScope(lastSym->scope), sym->value,
scatterable, copyRefs);
}
}
lastSym = sym;
}
if (lastSym != nullptr) {
atomFromSymbol(atomType, section, file, lastSym->value, lastSym->name,
lastSym->desc, atomScope(lastSym->scope),
section.address + section.content.size(),
scatterable, copyRefs);
}
// If object built without .subsections_via_symbols, add reference chain.
if (!scatterable) {
MachODefinedAtom *prevAtom = nullptr;
file.eachAtomInSection(section,
[&](MachODefinedAtom *atom, uint64_t offset)->void {
if (prevAtom)
prevAtom->addReference(Reference::KindNamespace::all,
Reference::KindArch::all,
Reference::kindLayoutAfter, 0, atom, 0);
prevAtom = atom;
});
}
return std::error_code();
}
std::error_code processSection(DefinedAtom::ContentType atomType,
const Section &section,
bool customSectionName,
const NormalizedFile &normalizedFile,
MachOFile &file, bool scatterable,
bool copyRefs) {
const bool is64 = MachOLinkingContext::is64Bit(normalizedFile.arch);
const bool isBig = MachOLinkingContext::isBigEndian(normalizedFile.arch);
// Get info on how to atomize section.
unsigned int sizeMultiple;
DefinedAtom::Scope scope;
DefinedAtom::Merge merge;
AtomizeModel atomizeModel;
sectionParseInfo(atomType, sizeMultiple, scope, merge, atomizeModel);
// Validate section size.
if ((section.content.size() % sizeMultiple) != 0)
return make_dynamic_error_code(Twine("Section ") + section.segmentName
+ "/" + section.sectionName
+ " has size ("
+ Twine(section.content.size())
+ ") which is not a multiple of "
+ Twine(sizeMultiple) );
if (atomizeModel == atomizeAtSymbols) {
// Break section up into atoms each with a fixed size.
return processSymboledSection(atomType, section, normalizedFile, file,
scatterable, copyRefs);
} else {
unsigned int size;
for (unsigned int offset = 0, e = section.content.size(); offset != e;) {
switch (atomizeModel) {
case atomizeFixedSize:
// Break section up into atoms each with a fixed size.
size = sizeMultiple;
break;
case atomizePointerSize:
// Break section up into atoms each the size of a pointer.
size = is64 ? 8 : 4;
break;
case atomizeUTF8:
// Break section up into zero terminated c-strings.
size = 0;
for (unsigned int i = offset; i < e; ++i) {
if (section.content[i] == 0) {
size = i + 1 - offset;
break;
}
}
break;
case atomizeUTF16:
// Break section up into zero terminated UTF16 strings.
size = 0;
for (unsigned int i = offset; i < e; i += 2) {
if ((section.content[i] == 0) && (section.content[i + 1] == 0)) {
size = i + 2 - offset;
break;
}
}
break;
case atomizeCFI:
// Break section up into dwarf unwind CFIs (FDE or CIE).
size = read32(&section.content[offset], isBig) + 4;
if (offset+size > section.content.size()) {
return make_dynamic_error_code(Twine(Twine("Section ")
+ section.segmentName
+ "/" + section.sectionName
+ " is malformed. Size of CFI "
"starting at offset ("
+ Twine(offset)
+ ") is past end of section."));
}
break;
case atomizeCU:
// Break section up into compact unwind entries.
size = is64 ? 32 : 20;
break;
case atomizeCFString:
// Break section up into NS/CFString objects.
size = is64 ? 32 : 16;
break;
case atomizeAtSymbols:
break;
}
if (size == 0) {
return make_dynamic_error_code(Twine("Section ") + section.segmentName
+ "/" + section.sectionName
+ " is malformed. The last atom is "
"not zero terminated.");
}
if (customSectionName) {
// Mach-O needs a segment and section name. Concatentate those two
// with a / separator (e.g. "seg/sect") to fit into the lld model
// of just a section name.
std::string segSectName = section.segmentName.str()
+ "/" + section.sectionName.str();
file.addDefinedAtomInCustomSection(StringRef(), scope, atomType,
merge, false, false, offset,
size, segSectName, true, &section);
} else {
file.addDefinedAtom(StringRef(), scope, atomType, merge, offset, size,
false, false, copyRefs, &section);
}
offset += size;
}
}
return std::error_code();
}
const Section* findSectionCoveringAddress(const NormalizedFile &normalizedFile,
uint64_t address) {
for (const Section &s : normalizedFile.sections) {
uint64_t sAddr = s.address;
if ((sAddr <= address) && (address < sAddr+s.content.size())) {
return &s;
}
}
return nullptr;
}
const MachODefinedAtom *
findAtomCoveringAddress(const NormalizedFile &normalizedFile, MachOFile &file,
uint64_t addr, Reference::Addend *addend) {
const Section *sect = nullptr;
sect = findSectionCoveringAddress(normalizedFile, addr);
if (!sect)
return nullptr;
uint32_t offsetInTarget;
uint64_t offsetInSect = addr - sect->address;
auto atom =
file.findAtomCoveringAddress(*sect, offsetInSect, &offsetInTarget);
*addend = offsetInTarget;
return atom;
}
// Walks all relocations for a section in a normalized .o file and
// creates corresponding lld::Reference objects.
std::error_code convertRelocs(const Section &section,
const NormalizedFile &normalizedFile,
bool scatterable,
MachOFile &file,
ArchHandler &handler) {
// Utility function for ArchHandler to find atom by its address.
auto atomByAddr = [&] (uint32_t sectIndex, uint64_t addr,
const lld::Atom **atom, Reference::Addend *addend)
-> std::error_code {
if (sectIndex > normalizedFile.sections.size())
return make_dynamic_error_code(Twine("out of range section "
"index (") + Twine(sectIndex) + ")");
const Section *sect = nullptr;
if (sectIndex == 0) {
sect = findSectionCoveringAddress(normalizedFile, addr);
if (!sect)
return make_dynamic_error_code(Twine("address (" + Twine(addr)
+ ") is not in any section"));
} else {
sect = &normalizedFile.sections[sectIndex-1];
}
uint32_t offsetInTarget;
uint64_t offsetInSect = addr - sect->address;
*atom = file.findAtomCoveringAddress(*sect, offsetInSect, &offsetInTarget);
*addend = offsetInTarget;
return std::error_code();
};
// Utility function for ArchHandler to find atom by its symbol index.
auto atomBySymbol = [&] (uint32_t symbolIndex, const lld::Atom **result)
-> std::error_code {
// Find symbol from index.
const Symbol *sym = nullptr;
uint32_t numLocal = normalizedFile.localSymbols.size();
uint32_t numGlobal = normalizedFile.globalSymbols.size();
uint32_t numUndef = normalizedFile.undefinedSymbols.size();
if (symbolIndex < numLocal) {
sym = &normalizedFile.localSymbols[symbolIndex];
} else if (symbolIndex < numLocal+numGlobal) {
sym = &normalizedFile.globalSymbols[symbolIndex-numLocal];
} else if (symbolIndex < numLocal+numGlobal+numUndef) {
sym = &normalizedFile.undefinedSymbols[symbolIndex-numLocal-numGlobal];
} else {
return make_dynamic_error_code(Twine("symbol index (")
+ Twine(symbolIndex) + ") out of range");
}
// Find atom from symbol.
if ((sym->type & N_TYPE) == N_SECT) {
if (sym->sect > normalizedFile.sections.size())
return make_dynamic_error_code(Twine("symbol section index (")
+ Twine(sym->sect) + ") out of range ");
const Section &symSection = normalizedFile.sections[sym->sect-1];
uint64_t targetOffsetInSect = sym->value - symSection.address;
MachODefinedAtom *target = file.findAtomCoveringAddress(symSection,
targetOffsetInSect);
if (target) {
*result = target;
return std::error_code();
}
return make_dynamic_error_code("no atom found for defined symbol");
} else if ((sym->type & N_TYPE) == N_UNDF) {
const lld::Atom *target = file.findUndefAtom(sym->name);
if (target) {
*result = target;
return std::error_code();
}
return make_dynamic_error_code("no undefined atom found for sym");
} else {
// Search undefs
return make_dynamic_error_code("no atom found for symbol");
}
};
const bool isBig = MachOLinkingContext::isBigEndian(normalizedFile.arch);
// Use old-school iterator so that paired relocations can be grouped.
for (auto it=section.relocations.begin(), e=section.relocations.end();
it != e; ++it) {
const Relocation &reloc = *it;
// Find atom this relocation is in.
if (reloc.offset > section.content.size())
return make_dynamic_error_code(Twine("r_address (") + Twine(reloc.offset)
+ ") is larger than section size ("
+ Twine(section.content.size()) + ")");
uint32_t offsetInAtom;
MachODefinedAtom *inAtom = file.findAtomCoveringAddress(section,
reloc.offset,
&offsetInAtom);
assert(inAtom && "r_address in range, should have found atom");
uint64_t fixupAddress = section.address + reloc.offset;
const lld::Atom *target = nullptr;
Reference::Addend addend = 0;
Reference::KindValue kind;
std::error_code relocErr;
if (handler.isPairedReloc(reloc)) {
// Handle paired relocations together.
const Relocation &reloc2 = *++it;
relocErr = handler.getPairReferenceInfo(
reloc, reloc2, inAtom, offsetInAtom, fixupAddress, isBig, scatterable,
atomByAddr, atomBySymbol, &kind, &target, &addend);
if (relocErr) {
return make_dynamic_error_code(
Twine("bad relocation (") + relocErr.message()
+ ") in section "
+ section.segmentName + "/" + section.sectionName
+ " (r1_address=" + Twine::utohexstr(reloc.offset)
+ ", r1_type=" + Twine(reloc.type)
+ ", r1_extern=" + Twine(reloc.isExtern)
+ ", r1_length=" + Twine((int)reloc.length)
+ ", r1_pcrel=" + Twine(reloc.pcRel)
+ (!reloc.scattered ? (Twine(", r1_symbolnum=")
+ Twine(reloc.symbol))
: (Twine(", r1_scattered=1, r1_value=")
+ Twine(reloc.value)))
+ ")"
+ ", (r2_address=" + Twine::utohexstr(reloc2.offset)
+ ", r2_type=" + Twine(reloc2.type)
+ ", r2_extern=" + Twine(reloc2.isExtern)
+ ", r2_length=" + Twine((int)reloc2.length)
+ ", r2_pcrel=" + Twine(reloc2.pcRel)
+ (!reloc2.scattered ? (Twine(", r2_symbolnum=")
+ Twine(reloc2.symbol))
: (Twine(", r2_scattered=1, r2_value=")
+ Twine(reloc2.value)))
+ ")" );
}
}
else {
// Use ArchHandler to convert relocation record into information
// needed to instantiate an lld::Reference object.
relocErr = handler.getReferenceInfo(
reloc, inAtom, offsetInAtom, fixupAddress, isBig, atomByAddr,
atomBySymbol, &kind, &target, &addend);
if (relocErr) {
return make_dynamic_error_code(
Twine("bad relocation (") + relocErr.message()
+ ") in section "
+ section.segmentName + "/" + section.sectionName
+ " (r_address=" + Twine::utohexstr(reloc.offset)
+ ", r_type=" + Twine(reloc.type)
+ ", r_extern=" + Twine(reloc.isExtern)
+ ", r_length=" + Twine((int)reloc.length)
+ ", r_pcrel=" + Twine(reloc.pcRel)
+ (!reloc.scattered ? (Twine(", r_symbolnum=") + Twine(reloc.symbol))
: (Twine(", r_scattered=1, r_value=")
+ Twine(reloc.value)))
+ ")" );
}
}
// Instantiate an lld::Reference object and add to its atom.
inAtom->addReference(Reference::KindNamespace::mach_o,
handler.kindArch(),
kind, offsetInAtom, target, addend);
}
return std::error_code();
}
bool isDebugInfoSection(const Section &section) {
if ((section.attributes & S_ATTR_DEBUG) == 0)
return false;
return section.segmentName.equals("__DWARF");
}
static int64_t readSPtr(bool is64, bool isBig, const uint8_t *addr) {
if (is64)
return read64(addr, isBig);
int32_t res = read32(addr, isBig);
return res;
}
/// --- Augmentation String Processing ---
struct CIEInfo {
bool _augmentationDataPresent = false;
bool _mayHaveEH = false;
uint32_t _offsetOfLSDA = ~0U;
uint32_t _offsetOfPersonality = ~0U;
uint32_t _offsetOfFDEPointerEncoding = ~0U;
uint32_t _augmentationDataLength = ~0U;
};
typedef llvm::DenseMap<const MachODefinedAtom*, CIEInfo> CIEInfoMap;
static std::error_code processAugmentationString(const uint8_t *augStr,
CIEInfo &cieInfo,
unsigned &len) {
if (augStr[0] == '\0') {
len = 1;
return std::error_code();
}
if (augStr[0] != 'z')
return make_dynamic_error_code("expected 'z' at start of augmentation "
"string");
cieInfo._augmentationDataPresent = true;
uint64_t idx = 1;
uint32_t offsetInAugmentationData = 0;
while (augStr[idx] != '\0') {
if (augStr[idx] == 'L') {
cieInfo._offsetOfLSDA = offsetInAugmentationData;
// This adds a single byte to the augmentation data.
++offsetInAugmentationData;
++idx;
continue;
}
if (augStr[idx] == 'P') {
cieInfo._offsetOfPersonality = offsetInAugmentationData;
// This adds a single byte to the augmentation data for the encoding,
// then a number of bytes for the pointer data.
// FIXME: We are assuming 4 is correct here for the pointer size as we
// always currently use delta32ToGOT.
offsetInAugmentationData += 5;
++idx;
continue;
}
if (augStr[idx] == 'R') {
cieInfo._offsetOfFDEPointerEncoding = offsetInAugmentationData;
// This adds a single byte to the augmentation data.
++offsetInAugmentationData;
++idx;
continue;
}
if (augStr[idx] == 'e') {
if (augStr[idx + 1] != 'h')
return make_dynamic_error_code("expected 'eh' in augmentation string");
cieInfo._mayHaveEH = true;
idx += 2;
continue;
}
++idx;
}
cieInfo._augmentationDataLength = offsetInAugmentationData;
len = idx + 1;
return std::error_code();
}
static std::error_code processCIE(const NormalizedFile &normalizedFile,
MachOFile &file,
mach_o::ArchHandler &handler,
const Section *ehFrameSection,
MachODefinedAtom *atom,
uint64_t offset,
CIEInfoMap &cieInfos) {
const bool isBig = MachOLinkingContext::isBigEndian(normalizedFile.arch);
const uint8_t *frameData = atom->rawContent().data();
CIEInfo cieInfo;
uint32_t size = read32(frameData, isBig);
uint64_t cieIDField = size == 0xffffffffU
? sizeof(uint32_t) + sizeof(uint64_t)
: sizeof(uint32_t);
uint64_t versionField = cieIDField + sizeof(uint32_t);
uint64_t augmentationStringField = versionField + sizeof(uint8_t);
unsigned augmentationStringLength = 0;
if (auto err = processAugmentationString(frameData + augmentationStringField,
cieInfo, augmentationStringLength))
return err;
if (cieInfo._offsetOfPersonality != ~0U) {
// If we have augmentation data for the personality function, then we may
// need to implicitly generate its relocation.
// Parse the EH Data field which is pointer sized.
uint64_t EHDataField = augmentationStringField + augmentationStringLength;
const bool is64 = MachOLinkingContext::is64Bit(normalizedFile.arch);
unsigned EHDataFieldSize = (cieInfo._mayHaveEH ? (is64 ? 8 : 4) : 0);
// Parse Code Align Factor which is a ULEB128.
uint64_t CodeAlignField = EHDataField + EHDataFieldSize;
unsigned lengthFieldSize = 0;
llvm::decodeULEB128(frameData + CodeAlignField, &lengthFieldSize);
// Parse Data Align Factor which is a SLEB128.
uint64_t DataAlignField = CodeAlignField + lengthFieldSize;
llvm::decodeSLEB128(frameData + DataAlignField, &lengthFieldSize);
// Parse Return Address Register which is a byte.
uint64_t ReturnAddressField = DataAlignField + lengthFieldSize;
// Parse the augmentation length which is a ULEB128.
uint64_t AugmentationLengthField = ReturnAddressField + 1;
uint64_t AugmentationLength =
llvm::decodeULEB128(frameData + AugmentationLengthField,
&lengthFieldSize);
if (AugmentationLength != cieInfo._augmentationDataLength)
return make_dynamic_error_code("CIE augmentation data length mismatch");
// Get the start address of the augmentation data.
uint64_t AugmentationDataField = AugmentationLengthField + lengthFieldSize;
// Parse the personality function from the augmentation data.
uint64_t PersonalityField =
AugmentationDataField + cieInfo._offsetOfPersonality;
// Parse the personality encoding.
// FIXME: Verify that this is a 32-bit pcrel offset.
uint64_t PersonalityFunctionField = PersonalityField + 1;
if (atom->begin() != atom->end()) {
// If we have an explicit relocation, then make sure it matches this
// offset as this is where we'd expect it to be applied to.
DefinedAtom::reference_iterator CurrentRef = atom->begin();
if (CurrentRef->offsetInAtom() != PersonalityFunctionField)
return make_dynamic_error_code("CIE personality reloc at wrong offset");
if (++CurrentRef != atom->end())
return make_dynamic_error_code("CIE contains too many relocs");
} else {
// Implicitly generate the personality function reloc. It's assumed to
// be a delta32 offset to a GOT entry.
// FIXME: Parse the encoding and check this.
int32_t funcDelta = read32(frameData + PersonalityFunctionField, isBig);
uint64_t funcAddress = ehFrameSection->address + offset +
PersonalityFunctionField;
funcAddress += funcDelta;
const MachODefinedAtom *func = nullptr;
Reference::Addend addend;
func = findAtomCoveringAddress(normalizedFile, file, funcAddress,
&addend);
atom->addReference(Reference::KindNamespace::mach_o, handler.kindArch(),
handler.unwindRefToPersonalityFunctionKind(),
PersonalityFunctionField, func, addend);
}
} else if (atom->begin() != atom->end()) {
// Otherwise, we expect there to be no relocations in this atom as the only
// relocation would have been to the personality function.
return make_dynamic_error_code("unexpected relocation in CIE");
}
cieInfos[atom] = std::move(cieInfo);
return std::error_code();
}
static std::error_code processFDE(const NormalizedFile &normalizedFile,
MachOFile &file,
mach_o::ArchHandler &handler,
const Section *ehFrameSection,
MachODefinedAtom *atom,
uint64_t offset,
const CIEInfoMap &cieInfos) {
const bool isBig = MachOLinkingContext::isBigEndian(normalizedFile.arch);
const bool is64 = MachOLinkingContext::is64Bit(normalizedFile.arch);
// Compiler wasn't lazy and actually told us what it meant.
// Unfortunately, the compiler may not have generated references for all of
// [cie, func, lsda] and so we still need to parse the FDE and add references
// for any the compiler didn't generate.
if (atom->begin() != atom->end())
atom->sortReferences();
DefinedAtom::reference_iterator CurrentRef = atom->begin();
// This helper returns the reference (if one exists) at the offset we are
// currently processing. It automatically increments the ref iterator if we
// do return a ref, and throws an error if we pass over a ref without
// comsuming it.
auto currentRefGetter = [&CurrentRef,
&atom](uint64_t Offset)->const Reference* {
// If there are no more refs found, then we are done.
if (CurrentRef == atom->end())
return nullptr;
const Reference *Ref = *CurrentRef;
// If we haven't reached the offset for this reference, then return that
// we don't yet have a reference to process.
if (Offset < Ref->offsetInAtom())
return nullptr;
// If the offset is equal, then we want to process this ref.
if (Offset == Ref->offsetInAtom()) {
++CurrentRef;
return Ref;
}
// The current ref is at an offset which is earlier than the current
// offset, then we failed to consume it when we should have. In this case
// throw an error.
llvm::report_fatal_error("Skipped reference when processing FDE");
};
// Helper to either get the reference at this current location, and verify
// that it is of the expected type, or add a reference of that type.
// Returns the reference target.
auto verifyOrAddReference = [&](uint64_t targetAddress,
Reference::KindValue refKind,
uint64_t refAddress,
bool allowsAddend)->const Atom* {
if (auto *ref = currentRefGetter(refAddress)) {
// The compiler already emitted a relocation for the CIE ref. This should
// have been converted to the correct type of reference in
// get[Pair]ReferenceInfo().
assert(ref->kindValue() == refKind &&
"Incorrect EHFrame reference kind");
return ref->target();
}
Reference::Addend addend;
auto *target = findAtomCoveringAddress(normalizedFile, file,
targetAddress, &addend);
atom->addReference(Reference::KindNamespace::mach_o, handler.kindArch(),
refKind, refAddress, target, addend);
if (!allowsAddend)
assert(!addend && "EHFrame reference cannot have addend");
return target;
};
const uint8_t *startFrameData = atom->rawContent().data();
const uint8_t *frameData = startFrameData;
uint32_t size = read32(frameData, isBig);
uint64_t cieFieldInFDE = size == 0xffffffffU
? sizeof(uint32_t) + sizeof(uint64_t)
: sizeof(uint32_t);
// Linker needs to fixup a reference from the FDE to its parent CIE (a
// 32-bit byte offset backwards in the __eh_frame section).
uint32_t cieDelta = read32(frameData + cieFieldInFDE, isBig);
uint64_t cieAddress = ehFrameSection->address + offset + cieFieldInFDE;
cieAddress -= cieDelta;
auto *cieRefTarget = verifyOrAddReference(cieAddress,
handler.unwindRefToCIEKind(),
cieFieldInFDE, false);
const MachODefinedAtom *cie = dyn_cast<MachODefinedAtom>(cieRefTarget);
assert(cie && cie->contentType() == DefinedAtom::typeCFI &&
"FDE's CIE field does not point at the start of a CIE.");
const CIEInfo &cieInfo = cieInfos.find(cie)->second;
// Linker needs to fixup reference from the FDE to the function it's
// describing. FIXME: there are actually different ways to do this, and the
// particular method used is specified in the CIE's augmentation fields
// (hopefully)
uint64_t rangeFieldInFDE = cieFieldInFDE + sizeof(uint32_t);
int64_t functionFromFDE = readSPtr(is64, isBig,
frameData + rangeFieldInFDE);
uint64_t rangeStart = ehFrameSection->address + offset + rangeFieldInFDE;
rangeStart += functionFromFDE;
verifyOrAddReference(rangeStart,
handler.unwindRefToFunctionKind(),
rangeFieldInFDE, true);
// Handle the augmentation data if there is any.
if (cieInfo._augmentationDataPresent) {
// First process the augmentation data length field.
uint64_t augmentationDataLengthFieldInFDE =
rangeFieldInFDE + 2 * (is64 ? sizeof(uint64_t) : sizeof(uint32_t));
unsigned lengthFieldSize = 0;
uint64_t augmentationDataLength =
llvm::decodeULEB128(frameData + augmentationDataLengthFieldInFDE,
&lengthFieldSize);
if (cieInfo._offsetOfLSDA != ~0U && augmentationDataLength > 0) {
// Look at the augmentation data field.
uint64_t augmentationDataFieldInFDE =
augmentationDataLengthFieldInFDE + lengthFieldSize;
int64_t lsdaFromFDE = readSPtr(is64, isBig,
frameData + augmentationDataFieldInFDE);
uint64_t lsdaStart =
ehFrameSection->address + offset + augmentationDataFieldInFDE +
lsdaFromFDE;
verifyOrAddReference(lsdaStart,
handler.unwindRefToFunctionKind(),
augmentationDataFieldInFDE, true);
}
}
return std::error_code();
}
std::error_code addEHFrameReferences(const NormalizedFile &normalizedFile,
MachOFile &file,
mach_o::ArchHandler &handler) {
const Section *ehFrameSection = nullptr;
for (auto &section : normalizedFile.sections)
if (section.segmentName == "__TEXT" &&
section.sectionName == "__eh_frame") {
ehFrameSection = &section;
break;
}
// No __eh_frame so nothing to do.
if (!ehFrameSection)
return std::error_code();
std::error_code ehFrameErr;
CIEInfoMap cieInfos;
file.eachAtomInSection(*ehFrameSection,
[&](MachODefinedAtom *atom, uint64_t offset) -> void {
assert(atom->contentType() == DefinedAtom::typeCFI);
// Bail out if we've encountered an error.
if (ehFrameErr)
return;
const bool isBig = MachOLinkingContext::isBigEndian(normalizedFile.arch);
if (ArchHandler::isDwarfCIE(isBig, atom))
ehFrameErr = processCIE(normalizedFile, file, handler, ehFrameSection,
atom, offset, cieInfos);
else
ehFrameErr = processFDE(normalizedFile, file, handler, ehFrameSection,
atom, offset, cieInfos);
});
return ehFrameErr;
}
std::error_code parseObjCImageInfo(const Section &sect,
const NormalizedFile &normalizedFile,
MachOFile &file) {
// struct objc_image_info {
// uint32_t version; // initially 0
// uint32_t flags;
// };
ArrayRef<uint8_t> content = sect.content;
if (content.size() != 8)
return make_dynamic_error_code(sect.segmentName + "/" +
sect.sectionName +
" in file " + file.path() +
" should be 8 bytes in size");
const bool isBig = MachOLinkingContext::isBigEndian(normalizedFile.arch);
uint32_t version = read32(content.data(), isBig);
if (version)
return make_dynamic_error_code(sect.segmentName + "/" +
sect.sectionName +
" in file " + file.path() +
" should have version=0");
uint32_t flags = read32(content.data() + 4, isBig);
if (flags & (MachOLinkingContext::objc_supports_gc |
MachOLinkingContext::objc_gc_only))
return make_dynamic_error_code(sect.segmentName + "/" +
sect.sectionName +
" in file " + file.path() +
" uses GC. This is not supported");
if (flags & MachOLinkingContext::objc_retainReleaseForSimulator)
file.setObjcConstraint(MachOLinkingContext::objc_retainReleaseForSimulator);
else
file.setObjcConstraint(MachOLinkingContext::objc_retainRelease);
file.setSwiftVersion((flags >> 8) & 0xFF);
return std::error_code();
}
/// Converts normalized mach-o file into an lld::File and lld::Atoms.
ErrorOr<std::unique_ptr<lld::File>>
objectToAtoms(const NormalizedFile &normalizedFile, StringRef path,
bool copyRefs) {
std::unique_ptr<MachOFile> file(new MachOFile(path));
if (std::error_code ec = normalizedObjectToAtoms(
file.get(), normalizedFile, copyRefs))
return ec;
return std::unique_ptr<File>(std::move(file));
}
ErrorOr<std::unique_ptr<lld::File>>
dylibToAtoms(const NormalizedFile &normalizedFile, StringRef path,
bool copyRefs) {
// Instantiate SharedLibraryFile object.
std::unique_ptr<MachODylibFile> file(new MachODylibFile(path));
normalizedDylibToAtoms(file.get(), normalizedFile, copyRefs);
return std::unique_ptr<File>(std::move(file));
}
} // anonymous namespace
namespace normalized {
static bool isObjCImageInfo(const Section &sect) {
return (sect.segmentName == "__OBJC" && sect.sectionName == "__image_info") ||
(sect.segmentName == "__DATA" && sect.sectionName == "__objc_imageinfo");
}
std::error_code
normalizedObjectToAtoms(MachOFile *file,
const NormalizedFile &normalizedFile,
bool copyRefs) {
DEBUG(llvm::dbgs() << "******** Normalizing file to atoms: "
<< file->path() << "\n");
bool scatterable = ((normalizedFile.flags & MH_SUBSECTIONS_VIA_SYMBOLS) != 0);
// Create atoms from each section.
for (auto &sect : normalizedFile.sections) {
DEBUG(llvm::dbgs() << "Creating atoms: "; sect.dump());
if (isDebugInfoSection(sect))
continue;
// If the file contains an objc_image_info struct, then we should parse the
// ObjC flags and Swift version.
if (isObjCImageInfo(sect)) {
if (std::error_code ec = parseObjCImageInfo(sect, normalizedFile, *file))
return ec;
// We then skip adding atoms for this section as we use the ObjCPass to
// re-emit this data after it has been aggregated for all files.
continue;
}
bool customSectionName;
DefinedAtom::ContentType atomType = atomTypeFromSection(sect,
customSectionName);
if (std::error_code ec =
processSection(atomType, sect, customSectionName, normalizedFile,
*file, scatterable, copyRefs))
return ec;
}
// Create atoms from undefined symbols.
for (auto &sym : normalizedFile.undefinedSymbols) {
// Undefinded symbols with n_value != 0 are actually tentative definitions.
if (sym.value == Hex64(0)) {
file->addUndefinedAtom(sym.name, copyRefs);
} else {
file->addTentativeDefAtom(sym.name, atomScope(sym.scope), sym.value,
DefinedAtom::Alignment(1 << (sym.desc >> 8)),
copyRefs);
}
}
// Convert mach-o relocations to References
std::unique_ptr<mach_o::ArchHandler> handler
= ArchHandler::create(normalizedFile.arch);
for (auto &sect : normalizedFile.sections) {
if (isDebugInfoSection(sect))
continue;
if (std::error_code ec = convertRelocs(sect, normalizedFile, scatterable,
*file, *handler))
return ec;
}
// Add additional arch-specific References
file->eachDefinedAtom([&](MachODefinedAtom* atom) -> void {
handler->addAdditionalReferences(*atom);
});
// Each __eh_frame section needs references to both __text (the function we're
// providing unwind info for) and itself (FDE -> CIE). These aren't
// represented in the relocations on some architectures, so we have to add
// them back in manually there.
if (std::error_code ec = addEHFrameReferences(normalizedFile, *file, *handler))
return ec;
// Process mach-o data-in-code regions array. That information is encoded in
// atoms as References at each transition point.
unsigned nextIndex = 0;
for (const DataInCode &entry : normalizedFile.dataInCode) {
++nextIndex;
const Section* s = findSectionCoveringAddress(normalizedFile, entry.offset);
if (!s) {
return make_dynamic_error_code(Twine("LC_DATA_IN_CODE address ("
+ Twine(entry.offset)
+ ") is not in any section"));
}
uint64_t offsetInSect = entry.offset - s->address;
uint32_t offsetInAtom;
MachODefinedAtom *atom = file->findAtomCoveringAddress(*s, offsetInSect,
&offsetInAtom);
if (offsetInAtom + entry.length > atom->size()) {
return make_dynamic_error_code(Twine("LC_DATA_IN_CODE entry (offset="
+ Twine(entry.offset)
+ ", length="
+ Twine(entry.length)
+ ") crosses atom boundary."));
}
// Add reference that marks start of data-in-code.
atom->addReference(Reference::KindNamespace::mach_o, handler->kindArch(),
handler->dataInCodeTransitionStart(*atom),
offsetInAtom, atom, entry.kind);
// Peek at next entry, if it starts where this one ends, skip ending ref.
if (nextIndex < normalizedFile.dataInCode.size()) {
const DataInCode &nextEntry = normalizedFile.dataInCode[nextIndex];
if (nextEntry.offset == (entry.offset + entry.length))
continue;
}
// If data goes to end of function, skip ending ref.
if ((offsetInAtom + entry.length) == atom->size())
continue;
// Add reference that marks end of data-in-code.
atom->addReference(Reference::KindNamespace::mach_o, handler->kindArch(),
handler->dataInCodeTransitionEnd(*atom),
offsetInAtom+entry.length, atom, 0);
}
// Cache some attributes on the file for use later.
file->setFlags(normalizedFile.flags);
file->setArch(normalizedFile.arch);
file->setOS(normalizedFile.os);
file->setMinVersion(normalizedFile.minOSverson);
file->setMinVersionLoadCommandKind(normalizedFile.minOSVersionKind);
// Sort references in each atom to their canonical order.
for (const DefinedAtom* defAtom : file->defined()) {
reinterpret_cast<const SimpleDefinedAtom*>(defAtom)->sortReferences();
}
return std::error_code();
}
std::error_code
normalizedDylibToAtoms(MachODylibFile *file,
const NormalizedFile &normalizedFile,
bool copyRefs) {
file->setInstallName(normalizedFile.installName);
file->setCompatVersion(normalizedFile.compatVersion);
file->setCurrentVersion(normalizedFile.currentVersion);
// Tell MachODylibFile object about all symbols it exports.
if (!normalizedFile.exportInfo.empty()) {
// If exports trie exists, use it instead of traditional symbol table.
for (const Export &exp : normalizedFile.exportInfo) {
bool weakDef = (exp.flags & EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION);
// StringRefs from export iterator are ephemeral, so force copy.
file->addExportedSymbol(exp.name, weakDef, true);
}
} else {
for (auto &sym : normalizedFile.globalSymbols) {
assert((sym.scope & N_EXT) && "only expect external symbols here");
bool weakDef = (sym.desc & N_WEAK_DEF);
file->addExportedSymbol(sym.name, weakDef, copyRefs);
}
}
// Tell MachODylibFile object about all dylibs it re-exports.
for (const DependentDylib &dep : normalizedFile.dependentDylibs) {
if (dep.kind == llvm::MachO::LC_REEXPORT_DYLIB)
file->addReExportedDylib(dep.path);
}
return std::error_code();
}
void relocatableSectionInfoForContentType(DefinedAtom::ContentType atomType,
StringRef &segmentName,
StringRef &sectionName,
SectionType &sectionType,
SectionAttr &sectionAttrs,
bool &relocsToDefinedCanBeImplicit) {
for (const MachORelocatableSectionToAtomType *p = sectsToAtomType ;
p->atomType != DefinedAtom::typeUnknown; ++p) {
if (p->atomType != atomType)
continue;
// Wild carded entries are ignored for reverse lookups.
if (p->segmentName.empty() || p->sectionName.empty())
continue;
segmentName = p->segmentName;
sectionName = p->sectionName;
sectionType = p->sectionType;
sectionAttrs = 0;
relocsToDefinedCanBeImplicit = false;
if (atomType == DefinedAtom::typeCode)
sectionAttrs = S_ATTR_PURE_INSTRUCTIONS;
if (atomType == DefinedAtom::typeCFI)
relocsToDefinedCanBeImplicit = true;
return;
}
llvm_unreachable("content type not yet supported");
}
ErrorOr<std::unique_ptr<lld::File>>
normalizedToAtoms(const NormalizedFile &normalizedFile, StringRef path,
bool copyRefs) {
switch (normalizedFile.fileType) {
case MH_DYLIB:
case MH_DYLIB_STUB:
return dylibToAtoms(normalizedFile, path, copyRefs);
case MH_OBJECT:
return objectToAtoms(normalizedFile, path, copyRefs);
default:
llvm_unreachable("unhandled MachO file type!");
}
}
#ifndef NDEBUG
void Section::dump(llvm::raw_ostream &OS) const {
OS << "Section (\"" << segmentName << ", " << sectionName << "\"";
OS << ", addr: " << llvm::format_hex(address, 16, true);
OS << ", size: " << llvm::format_hex(content.size(), 8, true) << ")\n";
}
#endif
} // namespace normalized
} // namespace mach_o
} // namespace lld
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