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