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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/>.
*/
#include <libsolidity/analysis/SyntaxChecker.h>
#include <memory>
#include <libsolidity/ast/AST.h>
#include <libsolidity/ast/ExperimentalFeatures.h>
#include <libsolidity/analysis/SemVerHandler.h>
#include <libsolidity/interface/ErrorReporter.h>
#include <libsolidity/interface/Version.h>
using namespace std;
using namespace dev;
using namespace dev::solidity;
bool SyntaxChecker::checkSyntax(ASTNode const& _astRoot)
{
_astRoot.accept(*this);
return Error::containsOnlyWarnings(m_errorReporter.errors());
}
bool SyntaxChecker::visit(SourceUnit const& _sourceUnit)
{
m_versionPragmaFound = false;
m_sourceUnit = &_sourceUnit;
return true;
}
void SyntaxChecker::endVisit(SourceUnit const& _sourceUnit)
{
if (!m_versionPragmaFound)
{
string errorString("Source file does not specify required compiler version!");
SemVerVersion recommendedVersion{string(VersionString)};
if (!recommendedVersion.isPrerelease())
errorString +=
"Consider adding \"pragma solidity ^" +
to_string(recommendedVersion.major()) +
string(".") +
to_string(recommendedVersion.minor()) +
string(".") +
to_string(recommendedVersion.patch()) +
string(";\"");
m_errorReporter.warning(_sourceUnit.location(), errorString);
}
m_sourceUnit = nullptr;
}
bool SyntaxChecker::visit(PragmaDirective const& _pragma)
{
solAssert(!_pragma.tokens().empty(), "");
solAssert(_pragma.tokens().size() == _pragma.literals().size(), "");
if (_pragma.tokens()[0] != Token::Identifier)
m_errorReporter.syntaxError(_pragma.location(), "Invalid pragma \"" + _pragma.literals()[0] + "\"");
else if (_pragma.literals()[0] == "experimental")
{
solAssert(m_sourceUnit, "");
vector<string> literals(_pragma.literals().begin() + 1, _pragma.literals().end());
if (literals.size() == 0)
m_errorReporter.syntaxError(
_pragma.location(),
"Experimental feature name is missing."
);
else if (literals.size() > 1)
m_errorReporter.syntaxError(
_pragma.location(),
"Stray arguments."
);
else
{
string const literal = literals[0];
if (literal.empty())
m_errorReporter.syntaxError(_pragma.location(), "Empty experimental feature name is invalid.");
else if (!ExperimentalFeatureNames.count(literal))
m_errorReporter.syntaxError(_pragma.location(), "Unsupported experimental feature name.");
else if (m_sourceUnit->annotation().experimentalFeatures.count(ExperimentalFeatureNames.at(literal)))
m_errorReporter.syntaxError(_pragma.location(), "Duplicate experimental feature name.");
else
{
auto feature = ExperimentalFeatureNames.at(literal);
m_sourceUnit->annotation().experimentalFeatures.insert(feature);
if (!ExperimentalFeatureOnlyAnalysis.count(feature))
m_errorReporter.warning(_pragma.location(), "Experimental features are turned on. Do not use experimental features on live deployments.");
}
}
}
else if (_pragma.literals()[0] == "solidity")
{
vector<Token::Value> tokens(_pragma.tokens().begin() + 1, _pragma.tokens().end());
vector<string> literals(_pragma.literals().begin() + 1, _pragma.literals().end());
SemVerMatchExpressionParser parser(tokens, literals);
auto matchExpression = parser.parse();
SemVerVersion currentVersion{string(VersionString)};
if (!matchExpression.matches(currentVersion))
m_errorReporter.syntaxError(
_pragma.location(),
"Source file requires different compiler version (current compiler is " +
string(VersionString) + " - note that nightly builds are considered to be "
"strictly less than the released version"
);
m_versionPragmaFound = true;
}
else
m_errorReporter.syntaxError(_pragma.location(), "Unknown pragma \"" + _pragma.literals()[0] + "\"");
return true;
}
bool SyntaxChecker::visit(ModifierDefinition const&)
{
m_placeholderFound = false;
return true;
}
void SyntaxChecker::endVisit(ModifierDefinition const& _modifier)
{
if (!m_placeholderFound)
m_errorReporter.syntaxError(_modifier.body().location(), "Modifier body does not contain '_'.");
m_placeholderFound = false;
}
bool SyntaxChecker::visit(WhileStatement const&)
{
m_inLoopDepth++;
return true;
}
void SyntaxChecker::endVisit(WhileStatement const&)
{
m_inLoopDepth--;
}
bool SyntaxChecker::visit(ForStatement const&)
{
m_inLoopDepth++;
return true;
}
void SyntaxChecker::endVisit(ForStatement const&)
{
m_inLoopDepth--;
}
bool SyntaxChecker::visit(Continue const& _continueStatement)
{
if (m_inLoopDepth <= 0)
// we're not in a for/while loop, report syntax error
m_errorReporter.syntaxError(_continueStatement.location(), "\"continue\" has to be in a \"for\" or \"while\" loop.");
return true;
}
bool SyntaxChecker::visit(Break const& _breakStatement)
{
if (m_inLoopDepth <= 0)
// we're not in a for/while loop, report syntax error
m_errorReporter.syntaxError(_breakStatement.location(), "\"break\" has to be in a \"for\" or \"while\" loop.");
return true;
}
bool SyntaxChecker::visit(Throw const& _throwStatement)
{
bool const v050 = m_sourceUnit->annotation().experimentalFeatures.count(ExperimentalFeature::V050);
if (v050)
m_errorReporter.syntaxError(
_throwStatement.location(),
"\"throw\" is deprecated in favour of \"revert()\", \"require()\" and \"assert()\"."
);
else
m_errorReporter.warning(
_throwStatement.location(),
"\"throw\" is deprecated in favour of \"revert()\", \"require()\" and \"assert()\"."
);
return true;
}
bool SyntaxChecker::visit(UnaryOperation const& _operation)
{
bool const v050 = m_sourceUnit->annotation().experimentalFeatures.count(ExperimentalFeature::V050);
if (_operation.getOperator() == Token::Add)
{
if (v050)
m_errorReporter.syntaxError(_operation.location(), "Use of unary + is deprecated.");
else
m_errorReporter.warning(_operation.location(), "Use of unary + is deprecated.");
}
return true;
}
bool SyntaxChecker::visit(PlaceholderStatement const&)
{
m_placeholderFound = true;
return true;
}
bool SyntaxChecker::visit(FunctionDefinition const& _function)
{
if (_function.noVisibilitySpecified())
m_errorReporter.warning(
_function.location(),
"No visibility specified. Defaulting to \"" +
Declaration::visibilityToString(_function.visibility()) +
"\"."
);
return true;
}
bool SyntaxChecker::visit(FunctionTypeName const& _node)
{
for (auto const& decl: _node.parameterTypeList()->parameters())
if (!decl->name().empty())
m_errorReporter.warning(decl->location(), "Naming function type parameters is deprecated.");
for (auto const& decl: _node.returnParameterTypeList()->parameters())
if (!decl->name().empty())
m_errorReporter.warning(decl->location(), "Naming function type return parameters is deprecated.");
return true;
}
bool SyntaxChecker::visit(VariableDeclaration const& _declaration)
{
bool const v050 = m_sourceUnit->annotation().experimentalFeatures.count(ExperimentalFeature::V050);
if (!_declaration.typeName())
{
if (v050)
m_errorReporter.syntaxError(_declaration.location(), "Use of the \"var\" keyword is deprecated.");
else
m_errorReporter.warning(_declaration.location(), "Use of the \"var\" keyword is deprecated.");
}
return true;
}
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