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// Using the high-level representation of an ELF stub, create a text version
// of the ELF stub object.
#include "TextStubWriter.h"
#include <sstream>
#include "ELFStub.h"
#include "llvm/Support/ELF.h"
using namespace llvm;
namespace {
std::string LibShortname(const std::string &fullname) {
std::string result = fullname;
if (result.find("lib") != std::string::npos) {
result = result.substr(3);
}
size_t so_pos = result.find(".so");
if (so_pos != std::string::npos) {
result = result.substr(0, so_pos);
}
return result;
}
const ELF::Elf32_Half kDummyCodeShndx = 5;
const ELF::Elf32_Half kDummyDataShndx = 6;
} // namespace
namespace llvm {
// Write out the dynamic symbol table information. The format must be kept
// in sync with the changes in NaCl's version of gold (see gold/metadata.cc).
void WriteTextELFStub(const ELFStub *Stub, std::string *output) {
std::stringstream ss;
ss << "#### Symtab for " << Stub->SOName << "\n";
ss << "@obj " << LibShortname(Stub->SOName) << " " << Stub->SOName << "\n";
// st_value is usually a relative address for .so, and .exe files.
// So, make some up.
ELF::Elf32_Addr fake_relative_addr = 0;
for (size_t i = 0; i < Stub->Symbols.size(); ++i) {
const SymbolStub &sym = Stub->Symbols[i];
ELF::Elf32_Addr st_value = fake_relative_addr;
ELF::Elf32_Word st_size = sym.Size;
unsigned int st_info = sym.Type | (sym.Binding << 4);
unsigned int st_other = sym.Visibility;
ELF::Elf32_Half st_shndx = sym.Type == ELF::STT_FUNC ?
kDummyCodeShndx : kDummyDataShndx;
ELF::Elf32_Half vd_ndx = sym.VersionIndex;
// Mark non-default versions hidden.
if (!sym.IsDefault) {
vd_ndx |= ELF::VERSYM_HIDDEN;
}
ss << "@sym "
<< sym.Name << " " // Representative for st_name.
<< (st_value) << " "
<< (st_size) << " "
<< (st_info) << " "
<< (st_other) << " "
<< (st_shndx) << " "
<< (vd_ndx) << " "
<< "\n";
fake_relative_addr += (sym.Size == 0 ? 4 : sym.Size);
}
// Now dump the version map.
ss << "#### VerDefs for " << Stub->SOName << "\n";
for (size_t i = 0; i < Stub->VerDefs.size(); ++i) {
const VersionDefinition &verdef = Stub->VerDefs[i];
ss << "@ver " << (Elf32_Half)(verdef.Index) << " " << verdef.Name << "\n";
}
ss << "\n";
output->append(ss.str());
}
} // namespace llvm
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