mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
147 lines
4.0 KiB
C++
147 lines
4.0 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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/**
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* Parser for Yul code and data object container.
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*/
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#include <libyul/ObjectParser.h>
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#include <libyul/AsmParser.h>
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#include <libyul/Exceptions.h>
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#include <liblangutil/Token.h>
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using namespace dev;
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using namespace langutil;
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using namespace yul;
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using namespace std;
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shared_ptr<Object> ObjectParser::parse(shared_ptr<Scanner> const& _scanner, bool _reuseScanner)
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{
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m_recursionDepth = 0;
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try
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{
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shared_ptr<Object> object;
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m_scanner = _scanner;
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if (currentToken() == Token::LBrace)
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{
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// Special case: Code-only form.
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object = make_shared<Object>();
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object->name = "object"_yulstring;
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object->code = parseBlock();
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if (!object->code)
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return nullptr;
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}
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else
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object = parseObject();
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if (object && !_reuseScanner)
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expectToken(Token::EOS);
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return object;
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}
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catch (FatalError const&)
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{
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if (m_errorReporter.errors().empty())
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throw; // Something is weird here, rather throw again.
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}
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return nullptr;
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}
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shared_ptr<Object> ObjectParser::parseObject(Object* _containingObject)
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{
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RecursionGuard guard(*this);
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if (currentToken() != Token::Identifier || currentLiteral() != "object")
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fatalParserError("Expected keyword \"object\".");
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advance();
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shared_ptr<Object> ret = make_shared<Object>();
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ret->name = parseUniqueName(_containingObject);
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expectToken(Token::LBrace);
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ret->code = parseCode();
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while (currentToken() != Token::RBrace)
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{
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if (currentToken() == Token::Identifier && currentLiteral() == "object")
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parseObject(ret.get());
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else if (currentToken() == Token::Identifier && currentLiteral() == "data")
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parseData(*ret);
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else
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fatalParserError("Expected keyword \"data\" or \"object\" or \"}\".");
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}
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if (_containingObject)
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addNamedSubObject(*_containingObject, ret->name, ret);
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expectToken(Token::RBrace);
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return ret;
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}
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shared_ptr<Block> ObjectParser::parseCode()
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{
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if (currentToken() != Token::Identifier || currentLiteral() != "code")
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fatalParserError("Expected keyword \"code\".");
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advance();
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return parseBlock();
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}
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shared_ptr<Block> ObjectParser::parseBlock()
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{
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Parser parser(m_errorReporter, m_dialect);
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shared_ptr<Block> block = parser.parse(m_scanner, true);
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yulAssert(block || m_errorReporter.hasErrors(), "Invalid block but no error!");
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return block;
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}
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void ObjectParser::parseData(Object& _containingObject)
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{
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solAssert(
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currentToken() == Token::Identifier && currentLiteral() == "data",
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"parseData called on wrong input."
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);
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advance();
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YulString name = parseUniqueName(&_containingObject);
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expectToken(Token::StringLiteral, false);
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addNamedSubObject(_containingObject, name, make_shared<Data>(name, asBytes(currentLiteral())));
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advance();
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}
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YulString ObjectParser::parseUniqueName(Object const* _containingObject)
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{
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expectToken(Token::StringLiteral, false);
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YulString name{currentLiteral()};
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if (name.empty())
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parserError("Object name cannot be empty.");
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else if (_containingObject && _containingObject->name == name)
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parserError("Object name cannot be the same as the name of the containing object.");
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else if (_containingObject && _containingObject->subIndexByName.count(name))
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parserError("Object name \"" + name.str() + "\" already exists inside the containing object.");
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advance();
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return name;
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}
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void ObjectParser::addNamedSubObject(Object& _container, YulString _name, shared_ptr<ObjectNode> _subObject)
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{
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_container.subIndexByName[_name] = _container.subObjects.size();
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_container.subObjects.emplace_back(std::move(_subObject));
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}
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