Retro68/Elf2Mac/Symtab.cc

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2017-09-28 23:43:54 +00:00
/*
Copyright 2017 Wolfgang Thaller.
This file is part of Retro68.
Retro68 is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Retro68 is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Retro68. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Symtab.h"
#include <assert.h>
#include <utility>
#include "Symbol.h"
using std::make_pair;
using std::string;
Symtab::Symtab(Object& theObject, Elf_Scn *elfsec)
: elfsec(elfsec)
{
data = elf_getdata(elfsec, NULL);
GElf_Shdr shdr;
gelf_getshdr(elfsec, &shdr);
int count = shdr.sh_size / shdr.sh_entsize;
symbols.reserve(count);
for(int i = 0; i < count; i++)
{
GElf_Sym sym;
auto res = gelf_getsym(data, i, &sym);
assert(res != 0);
symbols.emplace_back(theObject, sym);
if(sym.st_shndx != SHN_UNDEF && sym.st_shndx < SHN_LORESERVE)
symbolsByAddress[make_pair((int)sym.st_shndx,sym.st_value)] = i;
if(sym.st_name)
symbolsByName[symbols.back().name] = i;
}
}
Symtab::~Symtab()
{
}
Symbol &Symtab::GetSym(int idx)
{
return symbols[idx];
}
int Symtab::FindSym(int secidx, uint32_t addr)
{
auto p = symbolsByAddress.find(make_pair(secidx, addr));
if(p != symbolsByAddress.end())
return p->second;
else
return -1;
}
int Symtab::FindSym(string name)
{
auto p = symbolsByName.find(name);
if(p != symbolsByName.end())
return p->second;
else
return -1;
}