mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
123 lines
3.4 KiB
C++
123 lines
3.4 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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#include <libyul/optimiser/NameSimplifier.h>
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#include <libyul/optimiser/NameCollector.h>
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#include <libyul/AST.h>
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#include <libyul/Dialect.h>
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#include <libyul/optimiser/OptimizerUtilities.h>
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#include <libsolutil/CommonData.h>
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#include <regex>
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using namespace solidity::yul;
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using namespace std;
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NameSimplifier::NameSimplifier(
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OptimiserStepContext& _context,
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Block const& _ast
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):
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m_context(_context),
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m_usedNames(_context.reservedIdentifiers)
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{
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for (YulString name: m_usedNames)
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m_translations[name] = name;
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set<YulString> allNames = NameCollector(_ast).names();
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m_usedNames += allNames;
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for (YulString name: allNames)
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findSimplification(name);
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}
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void NameSimplifier::operator()(FunctionDefinition& _funDef)
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{
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translate(_funDef.name);
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renameVariables(_funDef.parameters);
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renameVariables(_funDef.returnVariables);
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ASTModifier::operator()(_funDef);
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}
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void NameSimplifier::operator()(VariableDeclaration& _varDecl)
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{
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renameVariables(_varDecl.variables);
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ASTModifier::operator()(_varDecl);
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}
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void NameSimplifier::renameVariables(vector<TypedName>& _variables)
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{
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for (TypedName& typedName: _variables)
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translate(typedName.name);
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}
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void NameSimplifier::operator()(Identifier& _identifier)
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{
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translate(_identifier.name);
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}
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void NameSimplifier::operator()(FunctionCall& _funCall)
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{
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// The visitor on its own does not visit the function name.
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if (!m_context.dialect.builtin(_funCall.functionName.name))
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(*this)(_funCall.functionName);
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ASTModifier::operator()(_funCall);
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}
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void NameSimplifier::findSimplification(YulString _name)
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{
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if (m_translations.count(_name))
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return;
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string name = _name.str();
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static auto replacements = vector<pair<regex, string>>{
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{regex("_\\$\\d+"), ""}, // removes AST IDs
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{regex("(abi_..code.*)_to_.*"), "$1"}, // removes _to... for abi functions
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{regex("(stringliteral_[0-9a-f][0-9a-f][0-9a-f][0-9a-f])[0-9a-f]*"), "$1"}, // shorten string literal
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{regex("tuple_t_"), ""},
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{regex("_memory_ptr"), ""},
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{regex("_calldata_ptr"), "_calldata"},
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{regex("_fromStack"), ""},
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{regex("_storage_storage"), "_storage"},
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{regex("_memory_memory"), "_memory"},
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{regex("t_contract\\$_([^_]*)_"), "$1_"},
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{regex("index_access_t_array"), "index_access"},
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{regex("[0-9]*_$"), ""}
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};
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for (auto const& [pattern, substitute]: replacements)
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{
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string candidate = regex_replace(name, pattern, substitute);
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if (
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!isRestrictedIdentifier(m_context.dialect, YulString(candidate)) &&
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!m_usedNames.count(YulString(candidate))
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)
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name = candidate;
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}
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if (name != _name.str())
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{
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m_usedNames.insert(YulString(name));
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m_translations[_name] = YulString(name);
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}
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}
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void NameSimplifier::translate(YulString& _name)
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{
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auto it = m_translations.find(_name);
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if (it != m_translations.end())
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_name = it->second;
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}
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