mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
145 lines
4.5 KiB
C++
145 lines
4.5 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
|
|
/**
|
|
* Module for applying replacement rules against Expressions.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <libevmasm/SimplificationRule.h>
|
|
|
|
#include <libyul/ASTForward.h>
|
|
#include <libyul/YulString.h>
|
|
|
|
#include <libsolutil/CommonData.h>
|
|
|
|
#include <liblangutil/EVMVersion.h>
|
|
#include <liblangutil/SourceLocation.h>
|
|
|
|
#include <boost/noncopyable.hpp>
|
|
|
|
#include <functional>
|
|
#include <optional>
|
|
#include <vector>
|
|
|
|
namespace solidity::yul
|
|
{
|
|
struct Dialect;
|
|
struct AssignedValue;
|
|
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);
|
|
|
|
/// @returns a pointer to the first matching pattern and sets the match
|
|
/// groups accordingly.
|
|
/// @param _ssaValues values of variables that are assigned exactly once.
|
|
static Rule const* findFirstMatch(
|
|
Expression const& _expr,
|
|
Dialect const& _dialect,
|
|
std::map<YulString, AssignedValue> const& _ssaValues
|
|
);
|
|
|
|
/// 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;
|
|
|
|
static std::optional<std::pair<evmasm::Instruction, std::vector<Expression> const*>>
|
|
instructionAndArguments(Dialect const& _dialect, Expression const& _expr);
|
|
|
|
private:
|
|
void addRules(std::vector<Rule> const& _rules);
|
|
void addRule(Rule const& _rule);
|
|
|
|
void resetMatchGroups() { m_matchGroups.clear(); }
|
|
|
|
std::map<unsigned, Expression const*> m_matchGroups;
|
|
std::vector<evmasm::SimplificationRule<Pattern>> m_rules[256];
|
|
};
|
|
|
|
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:
|
|
using Builtins = evmasm::EVMBuiltins<Pattern>;
|
|
static constexpr size_t WordSize = 256;
|
|
using Word = u256;
|
|
|
|
/// Matches any expression.
|
|
Pattern(PatternKind _kind = PatternKind::Any): m_kind(_kind) {}
|
|
// Matches a specific constant value.
|
|
Pattern(unsigned _value): Pattern(u256(_value)) {}
|
|
Pattern(int _value): Pattern(u256(_value)) {}
|
|
Pattern(long unsigned _value): Pattern(u256(_value)) {}
|
|
// Matches a specific constant value.
|
|
Pattern(u256 const& _value): m_kind(PatternKind::Constant), m_data(std::make_shared<u256>(_value)) {}
|
|
// Matches a given instruction with given arguments
|
|
Pattern(evmasm::Instruction _instruction, std::initializer_list<Pattern> _arguments = {});
|
|
/// 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; }
|
|
bool matches(
|
|
Expression const& _expr,
|
|
Dialect const& _dialect,
|
|
std::map<YulString, AssignedValue> const& _ssaValues
|
|
) const;
|
|
|
|
std::vector<Pattern> arguments() const { return m_arguments; }
|
|
|
|
/// @returns the data of the matched expression if this pattern is part of a match group.
|
|
u256 d() const;
|
|
|
|
evmasm::Instruction instruction() const;
|
|
|
|
/// 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;
|
|
|
|
private:
|
|
Expression const& matchGroupValue() const;
|
|
|
|
PatternKind m_kind = PatternKind::Any;
|
|
evmasm::Instruction m_instruction; ///< Only valid if m_kind is Operation
|
|
std::shared_ptr<u256> m_data; ///< Only valid if m_kind is Constant
|
|
std::vector<Pattern> m_arguments;
|
|
unsigned m_matchGroup = 0;
|
|
std::map<unsigned, Expression const*>* m_matchGroups = nullptr;
|
|
};
|
|
|
|
}
|