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[ELF] add dynamic library support

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llvm-svn: 176483
This commit is contained in:
Shankar Easwaran 2013-03-05 14:52:48 +00:00
parent bcb722a452
commit 3ff62ade38
2 changed files with 40 additions and 7 deletions
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36
lld/lib/ReaderWriter/ELF/SectionChunks.h
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@ -584,18 +584,21 @@ class SymbolTable : public Section<ELFT> {
typedef llvm::object::Elf_Sym_Impl<ELFT> Elf_Sym;
struct SymbolEntry {
SymbolEntry(const Atom *a, const Elf_Sym &sym) : _atom(a), _symbol(sym) {}
SymbolEntry(const Atom *a, const Elf_Sym &sym,
const AtomLayout *layout) : _atom(a), _symbol(sym),
_atomLayout(layout) {}
SymbolEntry() : _atom(nullptr) {}
const Atom *_atom;
Elf_Sym _symbol;
const AtomLayout *_atomLayout;
};
public:
SymbolTable(const ELFTargetInfo &ti, const char *str, int32_t order);
void addSymbol(const Atom *atom, int32_t sectionIndex, uint64_t addr = 0);
void addSymbol(const Atom *atom, int32_t sectionIndex,
uint64_t addr = 0, const AtomLayout *layout=nullptr);
/// \brief Get the symbol table index for an Atom. If it's not in the symbol
/// table, return STN_UNDEF.
@ -617,7 +620,7 @@ public:
StringTable<ELFT> *getStringTable() const { return _stringSection; }
private:
protected:
llvm::BumpPtrAllocator _symbolAllocate;
StringTable<ELFT> *_stringSection;
std::vector<SymbolEntry> _symbolTable;
@ -631,16 +634,21 @@ SymbolTable<ELFT>::SymbolTable(const ELFTargetInfo &ti, const char *str,
this->setOrder(order);
Elf_Sym symbol;
std::memset(&symbol, 0, sizeof(Elf_Sym));
_symbolTable.push_back(SymbolEntry(nullptr, symbol));
_symbolTable.push_back(SymbolEntry(nullptr, symbol, nullptr));
this->_entSize = sizeof(Elf_Sym);
this->_fsize = sizeof(Elf_Sym);
this->_align2 = sizeof(Elf_Addr);
this->_type = SHT_SYMTAB;
}
/// Add a symbol to the symbol Table, definedAtoms which get added to the symbol
/// section dont have their virtual addresses set at the time of adding the
/// symbol to the symbol table(Example: dynamic symbols), the addresses needs
/// to be updated in the table before writing the dynamic symbol table
/// information
template <class ELFT>
void SymbolTable<ELFT>::addSymbol(const Atom *atom, int32_t sectionIndex,
uint64_t addr) {
uint64_t addr, const AtomLayout *atomLayout) {
Elf_Sym symbol;
unsigned char binding = 0, type = 0;
symbol.st_name = _stringSection->addString(atom->name());
@ -711,7 +719,7 @@ void SymbolTable<ELFT>::addSymbol(const Atom *atom, int32_t sectionIndex,
binding = llvm::ELF::STB_WEAK;
}
symbol.setBindingAndType(binding, type);
_symbolTable.push_back(SymbolEntry(atom, symbol));
_symbolTable.push_back(SymbolEntry(atom, symbol, atomLayout));
this->_fsize += sizeof(Elf_Sym);
if (this->_flags & SHF_ALLOC)
this->_msize = this->_fsize;
@ -757,6 +765,20 @@ public:
this->_flags = SHF_ALLOC;
this->_msize = this->_fsize;
}
virtual void finalize() {
// Defined symbols which have been added into the dynamic symbol table
// dont have their addresses known until addresses have been assigned
// so lets update the symbol values after they have got assigned
for (auto &ste: this->_symbolTable) {
const AtomLayout *atomLayout = ste._atomLayout;
if (!atomLayout)
continue;
ste._symbol.st_value = atomLayout->_virtualAddr;
}
SymbolTable<ELFT>::finalize();
}
};
template <class ELFT> class RelocationTable : public Section<ELFT> {

11
lld/test/elf/Hexagon/dynlib.test Normal file
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@ -0,0 +1,11 @@
RUN: lld -core -target hexagon %p/Inputs/use-shared.hexagon \
RUN: -output=%t1 -output-type=shared
RUN: llvm-readobj %t2 > %t3
RUN: FileCheck -check-prefix=DYNSYMS %s < %t3
DYNSYMS: Dynamic Symbols:
DYNSYMS: Name Type Address Size FileOffset Flags
DYNSYMS: fn2 FUNC 148 c 21c global
DYNSYMS: fn1 FUNC 154 c 228 global
DYNSYMS: fn3 FUNC 160 14 234 global
DYNSYMS: Total: 3