path: root/libevmasm/LinkerObject.cpp

/*
    This file is part of solidity.

    solidity 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.

    solidity 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 solidity.  If not, see <http://www.gnu.org/licenses/>.
*/
/** @file LinkerObject.cpp
 * @author Christian R <c@ethdev.com>
 * @date 2015
 */

#include <libevmasm/LinkerObject.h>
#include <libdevcore/CommonData.h>

using namespace dev;
using namespace dev::eth;
using namespace std;

void LinkerObject::append(LinkerObject const& _other)
{
    for (auto const& ref: _other.linkReferences)
        linkReferences[ref.first + bytecode.size()] = ref.second;
    bytecode += _other.bytecode;
}

void LinkerObject::link(map<string, h160> const& _libraryAddresses)
{
    std::map<size_t, std::string> remainingRefs;
    for (auto const& linkRef: linkReferences)
        if (h160 const* address = matchLibrary(linkRef.second, _libraryAddresses))
            address->ref().copyTo(ref(bytecode).cropped(linkRef.first, 20));
        else
            remainingRefs.insert(linkRef);
    linkReferences.swap(remainingRefs);
}

string LinkerObject::toHex() const
{
    string hex = dev::toHex(bytecode);
    for (auto const& ref: linkReferences)
    {
        size_t pos = ref.first * 2;
        string const& name = ref.second;
        hex[pos] = hex[pos + 1] = hex[pos + 38] = hex[pos + 39] = '_';
        for (size_t i = 0; i < 36; ++i)
            hex[pos + 2 + i] = i < name.size() ? name[i] : '_';
    }
    return hex;
}

h160 const*
LinkerObject::matchLibrary(
    string const& _linkRefName,
    map<string, h160> const& _libraryAddresses
)
{
    auto it = _libraryAddresses.find(_linkRefName);
    if (it != _libraryAddresses.end())
        return &it->second;
    // If the user did not supply a fully qualified library name,
    // try to match only the simple libary name
    size_t colon = _linkRefName.find(':');
    if (colon == string::npos)
        return nullptr;
    it = _libraryAddresses.find(_linkRefName.substr(colon + 1));
    if (it != _libraryAddresses.end())
        return &it->second;
    return nullptr;
}