mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
91 lines
2.8 KiB
C++
91 lines
2.8 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file BlockDeduplicator.h
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* @author Christian <c@ethdev.com>
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* @date 2015
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* Unifies basic blocks that share content.
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*/
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#pragma once
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#include <libsolutil/Common.h>
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#include <cstddef>
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#include <vector>
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#include <functional>
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#include <map>
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namespace solidity::evmasm
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{
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class AssemblyItem;
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using AssemblyItems = std::vector<AssemblyItem>;
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/**
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* Optimizer class to be used to unify blocks that share content.
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* Modifies the passed vector in place.
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*/
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class BlockDeduplicator
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{
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public:
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explicit BlockDeduplicator(AssemblyItems& _items): m_items(_items) {}
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/// @returns true if something was changed
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bool deduplicate();
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/// @returns the tags that were replaced.
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std::map<u256, u256> const& replacedTags() const { return m_replacedTags; }
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/// Replaces all PushTag operations insied @a _items that match a key in
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/// @a _replacements by the respective value. If @a _subID is not -1, only
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/// apply the replacement for foreign tags from this sub id.
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/// @returns true iff a replacement was performed.
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static bool applyTagReplacement(
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AssemblyItems& _items,
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std::map<u256, u256> const& _replacements,
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size_t _subID = size_t(-1)
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);
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private:
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/// Iterator that skips tags and skips to the end if (all branches of) the control
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/// flow does not continue to the next instruction.
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/// If the arguments are supplied to the constructor, replaces items on the fly.
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struct BlockIterator: std::iterator<std::forward_iterator_tag, AssemblyItem const>
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{
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public:
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BlockIterator(
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AssemblyItems::const_iterator _it,
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AssemblyItems::const_iterator _end,
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AssemblyItem const* _replaceItem = nullptr,
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AssemblyItem const* _replaceWith = nullptr
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):
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it(_it), end(_end), replaceItem(_replaceItem), replaceWith(_replaceWith) {}
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BlockIterator& operator++();
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bool operator==(BlockIterator const& _other) const { return it == _other.it; }
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bool operator!=(BlockIterator const& _other) const { return it != _other.it; }
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AssemblyItem const& operator*() const;
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AssemblyItems::const_iterator it;
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AssemblyItems::const_iterator end;
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AssemblyItem const* replaceItem;
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AssemblyItem const* replaceWith;
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};
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std::map<u256, u256> m_replacedTags;
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AssemblyItems& m_items;
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};
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}
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