[ELF][Writer] Add hash table.
llvm-svn: 175972
diff --git a/lld/lib/ReaderWriter/ELF/SectionChunks.h b/lld/lib/ReaderWriter/ELF/SectionChunks.h
index b5ca854..00dcbd1 100644
--- a/lld/lib/ReaderWriter/ELF/SectionChunks.h
+++ b/lld/lib/ReaderWriter/ELF/SectionChunks.h
@@ -836,6 +836,43 @@
private:
StringRef _interp;
};
+
+template <class ELFT> class HashSection : public Section<ELFT> {
+ struct SymbolTableEntry {
+ StringRef _name;
+ uint32_t _index;
+ };
+
+public:
+ HashSection(const ELFTargetInfo &ti, StringRef name, int32_t order)
+ : Section<ELFT>(ti, name) {
+ this->setOrder(order);
+ this->_align2 = 4; // Alignment of Elf32_Word.
+ this->_type = SHT_HASH;
+ this->_flags = SHF_ALLOC;
+ // The size of nbucket and nchain.
+ this->_fsize = 8;
+ this->_msize = this->_fsize;
+ }
+
+ void addSymbol(StringRef name, uint32_t index) {
+ SymbolTableEntry ste;
+ ste._name = name;
+ ste._index = index;
+ _entries.push_back(ste);
+ }
+
+ virtual void write(ELFWriter *writer, llvm::FileOutputBuffer &buffer) {
+ uint8_t *chunkBuffer = buffer.getBufferStart();
+ uint8_t *dest = chunkBuffer + this->fileOffset();
+ // TODO: Calculate hashes and build the hash table in finalize. We currently
+ // just emit an empty hash table so the dynamic loader doesn't crash.
+ std::memset(dest, 0, this->_fsize);
+ }
+
+private:
+ std::vector<SymbolTableEntry> _entries;
+};
} // end namespace elf
} // end namespace lld
diff --git a/lld/lib/ReaderWriter/ELF/Writer.cpp b/lld/lib/ReaderWriter/ELF/Writer.cpp
index 5e2bb1e..13048b7 100644
--- a/lld/lib/ReaderWriter/ELF/Writer.cpp
+++ b/lld/lib/ReaderWriter/ELF/Writer.cpp
@@ -72,6 +72,7 @@
LLD_UNIQUE_BUMP_PTR(DynamicSymbolTable<ELFT>) _dynamicSymbolTable;
LLD_UNIQUE_BUMP_PTR(StringTable<ELFT>) _dynamicStringTable;
LLD_UNIQUE_BUMP_PTR(InterpSection<ELFT>) _interpSection;
+ LLD_UNIQUE_BUMP_PTR(HashSection<ELFT>) _hashTable;
/// @}
CRuntimeFile<ELFT> _runtimeFile;
};
@@ -348,10 +349,13 @@
_interpSection.reset(new (_alloc) InterpSection<ELFT>(
_targetInfo, ".interp", DefaultLayout<ELFT>::ORDER_INTERP,
_targetInfo.getInterpreter()));
+ _hashTable.reset(new (_alloc) HashSection<ELFT>(
+ _targetInfo, ".hash", DefaultLayout<ELFT>::ORDER_HASH));
_layout->addSection(_dynamicTable.get());
_layout->addSection(_dynamicStringTable.get());
_layout->addSection(_dynamicSymbolTable.get());
_layout->addSection(_interpSection.get());
+ _layout->addSection(_hashTable.get());
_dynamicSymbolTable->setStringSection(_dynamicStringTable.get());
}