mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
92 lines
2.8 KiB
C++
92 lines
2.8 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 BlockDeduplicator.h
|
|
* @author Christian <c@ethdev.com>
|
|
* @date 2015
|
|
* Unifies basic blocks that share content.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <libsolutil/Common.h>
|
|
|
|
#include <cstddef>
|
|
#include <vector>
|
|
#include <functional>
|
|
#include <map>
|
|
|
|
namespace solidity::evmasm
|
|
{
|
|
|
|
class AssemblyItem;
|
|
using AssemblyItems = std::vector<AssemblyItem>;
|
|
|
|
/**
|
|
* Optimizer class to be used to unify blocks that share content.
|
|
* Modifies the passed vector in place.
|
|
*/
|
|
class BlockDeduplicator
|
|
{
|
|
public:
|
|
explicit BlockDeduplicator(AssemblyItems& _items): m_items(_items) {}
|
|
/// @returns true if something was changed
|
|
bool deduplicate();
|
|
/// @returns the tags that were replaced.
|
|
std::map<u256, u256> const& replacedTags() const { return m_replacedTags; }
|
|
|
|
/// Replaces all PushTag operations insied @a _items that match a key in
|
|
/// @a _replacements by the respective value. If @a _subID is not -1, only
|
|
/// apply the replacement for foreign tags from this sub id.
|
|
/// @returns true iff a replacement was performed.
|
|
static bool applyTagReplacement(
|
|
AssemblyItems& _items,
|
|
std::map<u256, u256> const& _replacements,
|
|
size_t _subID = size_t(-1)
|
|
);
|
|
|
|
private:
|
|
/// Iterator that skips tags and skips to the end if (all branches of) the control
|
|
/// flow does not continue to the next instruction.
|
|
/// If the arguments are supplied to the constructor, replaces items on the fly.
|
|
struct BlockIterator: std::iterator<std::forward_iterator_tag, AssemblyItem const>
|
|
{
|
|
public:
|
|
BlockIterator(
|
|
AssemblyItems::const_iterator _it,
|
|
AssemblyItems::const_iterator _end,
|
|
AssemblyItem const* _replaceItem = nullptr,
|
|
AssemblyItem const* _replaceWith = nullptr
|
|
):
|
|
it(_it), end(_end), replaceItem(_replaceItem), replaceWith(_replaceWith) {}
|
|
BlockIterator& operator++();
|
|
bool operator==(BlockIterator const& _other) const { return it == _other.it; }
|
|
bool operator!=(BlockIterator const& _other) const { return it != _other.it; }
|
|
AssemblyItem const& operator*() const;
|
|
AssemblyItems::const_iterator it;
|
|
AssemblyItems::const_iterator end;
|
|
AssemblyItem const* replaceItem;
|
|
AssemblyItem const* replaceWith;
|
|
};
|
|
|
|
std::map<u256, u256> m_replacedTags;
|
|
AssemblyItems& m_items;
|
|
};
|
|
|
|
}
|