Subzero: Assemble calls to constant addresses.

src/IceELFObjectWriter.cpp

 //===- subzero/src/IceELFObjectWriter.cpp - ELF object file writer --------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines the writer for ELF relocatable object files.
@@ skipping 66 matching lines @@
 
   const IceString SymTabName(".symtab");
   bool IsELF64 = isELF64(Ctx.getTargetArch());
   const Elf64_Xword SymTabAlign = IsELF64 ? 8 : 4;
   const Elf64_Xword SymTabEntSize =
       IsELF64 ? sizeof(Elf64_Sym) : sizeof(Elf32_Sym);
   static_assert(sizeof(Elf64_Sym) == 24 && sizeof(Elf32_Sym) == 16,
                 "Elf_Sym sizes cannot be derived from sizeof");
   SymTab = createSection<ELFSymbolTableSection>(SymTabName, SHT_SYMTAB, 0,
                                                 SymTabAlign, SymTabEntSize);
-  // The first entry in the symbol table should be a NULL entry.
-  const IceString NullSymName("");
-  SymTab->createDefinedSym(NullSymName, STT_NOTYPE, STB_LOCAL, NullSection, 0,
-                           0);
+  SymTab->createNullSymbol(NullSection);
 
   const IceString StrTabName(".strtab");
   StrTab =
       createSection<ELFStringTableSection>(StrTabName, SHT_STRTAB, 0, 1, 0);
 }
 
 template <typename T>
 T *ELFObjectWriter::createSection(const IceString &Name, Elf64_Word ShType,
                                   Elf64_Xword ShFlags, Elf64_Xword ShAddralign,
                                   Elf64_Xword ShEntsize) {
@@ skipping 516 matching lines @@
   if (IsELF64) {
     writeELFHeaderInternal<true>(ShOffset, ShStrTab->getNumber(),
                                  AllSections.size());
   } else {
     writeELFHeaderInternal<false>(ShOffset, ShStrTab->getNumber(),
                                   AllSections.size());
   }
 }
 
 } // end of namespace Ice