solidity/libyul/optimiser/SimplificationRules.h

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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/>.
*/
// SPDX-License-Identifier: GPL-3.0
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/**
* Module for applying replacement rules against Expressions.
*/
#pragma once
#include <libevmasm/SimplificationRule.h>
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#include <libyul/ASTForward.h>
#include <libyul/YulString.h>
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#include <libsolutil/CommonData.h>
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#include <liblangutil/EVMVersion.h>
#include <liblangutil/SourceLocation.h>
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#include <boost/noncopyable.hpp>
#include <functional>
#include <optional>
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#include <vector>
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namespace solidity::yul
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{
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struct Dialect;
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struct AssignedValue;
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class Pattern;
/**
* Container for all simplification rules.
*/
class SimplificationRules: public boost::noncopyable
{
public:
using Rule = evmasm::SimplificationRule<Pattern>;
explicit SimplificationRules(std::optional<langutil::EVMVersion> _evmVersion = std::nullopt);
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/// @returns a pointer to the first matching pattern and sets the match
/// groups accordingly.
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/// @param _ssaValues values of variables that are assigned exactly once.
static Rule const* findFirstMatch(
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Expression const& _expr,
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Dialect const& _dialect,
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std::map<YulString, AssignedValue> const& _ssaValues
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);
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/// Checks whether the rulelist is non-empty. This is usually enforced
/// by the constructor, but we had some issues with static initialization.
bool isInitialized() const;
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static std::optional<std::pair<evmasm::Instruction, std::vector<Expression> const*>>
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instructionAndArguments(Dialect const& _dialect, Expression const& _expr);
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private:
void addRules(std::vector<Rule> const& _rules);
void addRule(Rule const& _rule);
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void resetMatchGroups() { m_matchGroups.clear(); }
std::map<unsigned, Expression const*> m_matchGroups;
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std::vector<evmasm::SimplificationRule<Pattern>> m_rules[256];
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};
enum class PatternKind
{
Operation,
Constant,
Any
};
/**
* Pattern to match against an expression.
* Also stores matched expressions to retrieve them later, for constructing new expressions using
* ExpressionTemplate.
*/
class Pattern
{
public:
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using Builtins = evmasm::EVMBuiltins<Pattern>;
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static constexpr size_t WordSize = 256;
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using Word = u256;
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/// Matches any expression.
Pattern(PatternKind _kind = PatternKind::Any): m_kind(_kind) {}
// Matches a specific constant value.
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Pattern(unsigned _value): Pattern(u256(_value)) {}
Pattern(int _value): Pattern(u256(_value)) {}
Pattern(long unsigned _value): Pattern(u256(_value)) {}
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// Matches a specific constant value.
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Pattern(u256 const& _value): m_kind(PatternKind::Constant), m_data(std::make_shared<u256>(_value)) {}
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// Matches a given instruction with given arguments
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Pattern(evmasm::Instruction _instruction, std::initializer_list<Pattern> _arguments = {});
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/// Sets this pattern to be part of the match group with the identifier @a _group.
/// Inside one rule, all patterns in the same match group have to match expressions from the
/// same expression equivalence class.
void setMatchGroup(unsigned _group, std::map<unsigned, Expression const*>& _matchGroups);
unsigned matchGroup() const { return m_matchGroup; }
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bool matches(
Expression const& _expr,
Dialect const& _dialect,
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std::map<YulString, AssignedValue> const& _ssaValues
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) const;
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std::vector<Pattern> arguments() const { return m_arguments; }
/// @returns the data of the matched expression if this pattern is part of a match group.
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u256 d() const;
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evmasm::Instruction instruction() const;
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/// Turns this pattern into an actual expression. Should only be called
/// for patterns resulting from an action, i.e. with match groups assigned.
Expression toExpression(langutil::SourceLocation const& _location) const;
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private:
Expression const& matchGroupValue() const;
PatternKind m_kind = PatternKind::Any;
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evmasm::Instruction m_instruction; ///< Only valid if m_kind is Operation
std::shared_ptr<u256> m_data; ///< Only valid if m_kind is Constant
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std::vector<Pattern> m_arguments;
unsigned m_matchGroup = 0;
std::map<unsigned, Expression const*>* m_matchGroups = nullptr;
};
}