mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
88 lines
2.7 KiB
C++
88 lines
2.7 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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// SPDX-License-Identifier: GPL-3.0
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#pragma once
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#include <libsolidity/ast/AST.h>
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#include <libsolidity/analysis/ControlFlowGraph.h>
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#include <libsolutil/Algorithms.h>
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namespace solidity::frontend
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{
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/**
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* Analyses all function flows and recursively removes all exit edges from CFG
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* nodes that make function calls that will always revert.
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*/
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class ControlFlowRevertPruner
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{
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public:
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ControlFlowRevertPruner(CFG& _cfg): m_cfg(_cfg) {}
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void run();
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private:
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/// Possible revert states of a function call
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enum class RevertState
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{
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AllPathsRevert,
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HasNonRevertingPath,
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Unknown,
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};
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/// Simple attempt at resolving a function call
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/// Does not aim to be able to resolve all calls, only used for variable
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/// assignment tracking and revert behavior.
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/// @param _functionCall the function call to analyse
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/// @param _mostDerivedContract most derived contract
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/// @returns function definition to which the call resolved or nullptr if no
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/// definition was found.
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FunctionDefinition const* resolveCall(FunctionCall const& _functionCall, ContractDefinition const* _mostDerivedContract);
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/// Identify revert states of all function flows
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void findRevertStates();
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/// Modify function flows so that edges with reverting function calls are removed
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void modifyFunctionFlows();
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/// Collect all function calls made by `_function` for later analysis
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/// @param _function function to analyse
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/// @param _mostDerivedContract most derived contract used in the calls
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void collectCalls(FunctionDefinition const& _function, ContractDefinition const* _mostDerivedContract);
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/// Control Flow Graph object.
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CFG& m_cfg;
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/// function/contract pairs mapped to their according revert state
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std::map<CFG::FunctionContractTuple, RevertState> m_functions;
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/// Called function mapped to the set of function/contract pairs calling them
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std::map<
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FunctionDefinition const*,
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std::set<CFG::FunctionContractTuple>
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> m_calledBy;
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std::map<
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std::tuple<FunctionCall const*, ContractDefinition const*>,
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FunctionDefinition const*
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> m_resolveCache;
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};
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}
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