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[yaml2obj][ELF] Rudimentary symbol table support.

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Currently, we only output the name.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184255 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sean Silva
2013-06-18 23:14:03 +00:00
parent bd4bd3686d
commit afcf60fe15
4 changed files with 86 additions and 2 deletions
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45
tools/yaml2obj/yaml2elf.cpp
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@@ -133,6 +133,42 @@ static void createStringTableSectionHeader(Elf_Shdr &SHeader,
SHeader.sh_addralign = 1;
}
// FIXME: This function is hideous. Between the sheer number of parameters
// and the hideous ELF typenames, it's just a travesty. Factor the ELF
// output into a class (templated on ELFT) and share some typedefs.
template <class ELFT>
static void handleSymtabSectionHeader(
const ELFYAML::Section &Sec,
const typename object::ELFObjectFile<ELFT>::Elf_Ehdr &Header,
typename object::ELFObjectFile<ELFT>::Elf_Shdr &SHeader,
StringTableBuilder &StrTab, ContiguousBlobAccumulator &CBA,
unsigned DotStrtabSecNo) {
typedef typename object::ELFObjectFile<ELFT>::Elf_Sym Elf_Sym;
// TODO: Ensure that a manually specified `Link` field is diagnosed as an
// error for SHT_SYMTAB.
SHeader.sh_link = DotStrtabSecNo;
// TODO: Once we handle symbol binding, this should be one greater than
// symbol table index of the last local symbol.
SHeader.sh_info = 0;
SHeader.sh_entsize = sizeof(Elf_Sym);
std::vector<Elf_Sym> Syms;
// FIXME: Ensure STN_UNDEF entry is present.
for (unsigned i = 0, e = Sec.Symbols.size(); i != e; ++i) {
const ELFYAML::Symbol &Sym = Sec.Symbols[i];
Elf_Sym Symbol;
zero(Symbol);
if (!Sym.Name.empty())
Symbol.st_name = StrTab.addString(Sym.Name);
Syms.push_back(Symbol);
}
SHeader.sh_offset = CBA.currentOffset();
SHeader.sh_size = vectorDataSize(Syms);
writeVectorData(CBA.getOS(), Syms);
}
template <class ELFT>
static int writeELF(raw_ostream &OS, const ELFYAML::Object &Doc) {
using namespace llvm::ELF;
@@ -181,6 +217,7 @@ static int writeELF(raw_ostream &OS, const ELFYAML::Object &Doc) {
Header.e_shnum = Sections.size() + 2;
// Place section header string table last.
Header.e_shstrndx = Sections.size() + 1;
const unsigned DotStrtabSecNo = Sections.size();
SectionNameToIdxMap SN2I;
for (unsigned i = 0, e = Sections.size(); i != e; ++i) {
@@ -202,6 +239,7 @@ static int writeELF(raw_ostream &OS, const ELFYAML::Object &Doc) {
Header.e_ehsize + Header.e_shentsize * Header.e_shnum;
ContiguousBlobAccumulator CBA(SectionContentBeginOffset, Buf);
std::vector<Elf_Shdr> SHeaders;
StringTableBuilder DotStrTab;
for (unsigned i = 0, e = Sections.size(); i != e; ++i) {
const ELFYAML::Section &Sec = Sections[i];
Elf_Shdr SHeader;
@@ -227,11 +265,14 @@ static int writeELF(raw_ostream &OS, const ELFYAML::Object &Doc) {
SHeader.sh_info = 0;
SHeader.sh_addralign = Sec.AddressAlign;
SHeader.sh_entsize = 0;
// XXX: Really ugly right now. Need to put common state into a class.
if (Sec.Type == ELFYAML::ELF_SHT(SHT_SYMTAB))
handleSymtabSectionHeader<ELFT>(Sec, Header, SHeader, DotStrTab, CBA,
DotStrtabSecNo);
SHeaders.push_back(SHeader);
}
// .strtab string table header. Currently emitted empty.
StringTableBuilder DotStrTab;
// .strtab string table header.
Elf_Shdr DotStrTabSHeader;
zero(DotStrTabSHeader);
DotStrTabSHeader.sh_name = SHStrTab.addString(StringRef(".strtab"));