ElfSymbol::ElfSymbol(const ElfConfig& config,
const llvm::MemoryBuffer& in,
const ElfSection& symtab_sect,
ElfSymbolIndex index,
Section* sections[],
Diagnostic& diags)
: m_sect(0)
, m_name_index(0)
, m_value(0)
, m_symindex(index)
, m_in_table(true)
, m_weak_ref(false)
, m_weak_refr(false)
{
InputBuffer inbuf(in);
ElfSize symsize = symtab_sect.getEntSize();
inbuf.setPosition(symtab_sect.getFileOffset() + index * symsize);
if (inbuf.getReadableSize() < symsize)
{
diags.Report(SourceLocation(), diag::err_symbol_unreadable);
return;
}
config.setEndian(inbuf);
m_name_index = ReadU32(inbuf);
if (config.cls == ELFCLASS32)
{
m_value = ReadU32(inbuf);
m_size = Expr(ReadU32(inbuf));
}
unsigned char info = ReadU8(inbuf);
m_bind = ELF_ST_BIND(info);
m_type = ELF_ST_TYPE(info);
m_vis = ELF_ST_VISIBILITY(ReadU8(inbuf));
m_index = static_cast<ElfSectionIndex>(ReadU16(inbuf));
if (m_index != SHN_UNDEF && m_index < config.secthead_count)
m_sect = sections[m_index];
if (config.cls == ELFCLASS64)
{
m_value = ReadU64(inbuf);
m_size = Expr(ReadU64(inbuf));
}
}
bool
ElfConfig::ReadSymbolTable(const MemoryBuffer& in,
const ElfSection& symtab_sect,
ElfSymtab& symtab,
Object& object,
const StringTable& strtab,
Section* sections[],
DiagnosticsEngine& diags) const
{
ElfSize symsize = symtab_sect.getEntSize();
if (symsize == 0)
{
diags.Report(SourceLocation(), diag::err_symbol_entity_size_zero);
return false;
}
unsigned long size = symtab_sect.getSize().getUInt();
// Symbol table always starts with null entry
symtab.push_back(SymbolRef(0));
ElfSymbolIndex index = 1;
for (unsigned long pos=symsize; pos<size; pos += symsize, ++index)
{
std::auto_ptr<ElfSymbol> elfsym(
new ElfSymbol(*this, in, symtab_sect, index, sections, diags));
if (diags.hasErrorOccurred())
return false;
SymbolRef sym = elfsym->CreateSymbol(object, strtab);
symtab.push_back(sym);
if (sym)
sym->AddAssocData(elfsym); // Associate symbol data with symbol
}
return true;
}
