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/*
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>
#include <libdevcore/Keccak256.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))
copy(address->data(), address->data() + 20, bytecode.begin() + linkRef.first);
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 hash = libraryPlaceholder(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] = hash.at(i);
}
return hex;
}
string LinkerObject::libraryPlaceholder(string const& _libraryName)
{
return "$" + keccak256(_libraryName).hex().substr(0, 34) + "$";
}
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 library 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;
}
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