mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
58 lines
1.8 KiB
C++
58 lines
1.8 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/>.
|
|
*/
|
|
#pragma once
|
|
|
|
#include <libyul/optimiser/ASTWalker.h>
|
|
#include <libyul/Dialect.h>
|
|
|
|
namespace yul
|
|
{
|
|
|
|
struct OptimiserStepContext;
|
|
|
|
/**
|
|
* Rewrites ForLoop by moving iteration condition into the ForLoop body.
|
|
* For example, `for {} lt(a, b) {} { mstore(1, 2) }` will become
|
|
* `for {} 1 {} { if iszero(lt(a, b)) { break } mstore(1, 2) }`
|
|
*
|
|
* By moving the iteration check part into the ForLoop body, we can apply expression splitter
|
|
* to the condition expression.
|
|
*
|
|
* This rewriter will skip loops that already have literal constant as iteration condition.
|
|
*
|
|
* Requirements:
|
|
* - The Disambiguator must be run upfront.
|
|
* - To avoid unnecessary rewrite, it is recommended to run this rewriter after StructuralSimplifier.
|
|
* - Only works for dialects with a builtin boolean negation function.
|
|
*/
|
|
class ForLoopConditionIntoBody: public ASTModifier
|
|
{
|
|
public:
|
|
static constexpr char const* name{"ForLoopConditionIntoBody"};
|
|
static void run(OptimiserStepContext&, Block& _ast);
|
|
|
|
using ASTModifier::operator();
|
|
void operator()(ForLoop& _forLoop) override;
|
|
|
|
private:
|
|
ForLoopConditionIntoBody(Dialect const& _dialect): m_dialect(_dialect) {}
|
|
|
|
Dialect const& m_dialect;
|
|
};
|
|
|
|
}
|