solidity/libevmasm/LinkerObject.cpp
Daniel Kirchner 4064116df4 Do not duplicate subassemblies.
Add LinkerObject check and more tests
2023-02-20 22:20:45 +01:00

86 lines
2.5 KiB
C++

/*
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/>.
*/
// SPDX-License-Identifier: GPL-3.0
/** @file LinkerObject.cpp
* @author Christian R <c@ethdev.com>
* @date 2015
*/
#include <libevmasm/LinkerObject.h>
#include <libsolutil/CommonData.h>
#include <libsolutil/Keccak256.h>
using namespace std;
using namespace solidity;
using namespace solidity::util;
using namespace solidity::evmasm;
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() + vector<uint8_t>::difference_type(linkRef.first));
else
remainingRefs.insert(linkRef);
linkReferences.swap(remainingRefs);
}
string LinkerObject::toHex() const
{
string hex = solidity::util::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;
return nullptr;
}
bool LinkerObject::operator<(LinkerObject const& _other) const
{
return tie(this->bytecode, this->linkReferences, this->immutableReferences) <
tie(_other.bytecode, _other.linkReferences, _other.immutableReferences);
}