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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/>.
*/
/**
* Analysis part of inline assembly.
*/
#pragma once
#include <liblangutil/Exceptions.h>
#include <liblangutil/EVMVersion.h>
#include <libyul/Dialect.h>
#include <libyul/AsmScope.h>
#include <libyul/AsmDataForward.h>
#include <libyul/backends/evm/AbstractAssembly.h>
#include <boost/variant.hpp>
#include <boost/optional.hpp>
#include <functional>
#include <memory>
namespace langutil
{
class ErrorReporter;
struct SourceLocation;
}
namespace yul
{
struct AsmAnalysisInfo;
/**
* Performs the full analysis stage, calls the ScopeFiller internally, then resolves
* references and performs other checks.
* If all these checks pass, code generation should not throw errors.
*/
class AsmAnalyzer: public boost::static_visitor<bool>
{
public:
explicit AsmAnalyzer(
AsmAnalysisInfo& _analysisInfo,
langutil::ErrorReporter& _errorReporter,
dev::solidity::EVMVersion _evmVersion,
boost::optional<langutil::Error::Type> _errorTypeForLoose,
Dialect _dialect = Dialect::looseAssemblyForEVM(),
ExternalIdentifierAccess::Resolver const& _resolver = ExternalIdentifierAccess::Resolver()
):
m_resolver(_resolver),
m_info(_analysisInfo),
m_errorReporter(_errorReporter),
m_evmVersion(_evmVersion),
m_dialect(std::move(_dialect)),
m_errorTypeForLoose(_errorTypeForLoose)
{}
bool analyze(Block const& _block);
bool operator()(Instruction const&);
bool operator()(Literal const& _literal);
bool operator()(Identifier const&);
bool operator()(FunctionalInstruction const& _functionalInstruction);
bool operator()(Label const& _label);
bool operator()(ExpressionStatement const&);
bool operator()(StackAssignment const&);
bool operator()(Assignment const& _assignment);
bool operator()(VariableDeclaration const& _variableDeclaration);
bool operator()(FunctionDefinition const& _functionDefinition);
bool operator()(FunctionCall const& _functionCall);
bool operator()(If const& _if);
bool operator()(Switch const& _switch);
bool operator()(ForLoop const& _forLoop);
bool operator()(Block const& _block);
private:
/// Visits the statement and expects it to deposit one item onto the stack.
bool expectExpression(Expression const& _expr);
bool expectDeposit(int _deposit, int _oldHeight, langutil::SourceLocation const& _location);
/// Verifies that a variable to be assigned to exists and has the same size
/// as the value, @a _valueSize, unless that is equal to -1.
bool checkAssignment(Identifier const& _assignment, size_t _valueSize = size_t(-1));
Scope& scope(Block const* _block);
void expectValidType(std::string const& type, langutil::SourceLocation const& _location);
void warnOnInstructions(dev::solidity::Instruction _instr, langutil::SourceLocation const& _location);
/// Depending on @a m_flavour and @a m_errorTypeForLoose, throws an internal compiler
/// exception (if the flavour is not Loose), reports an error/warning
/// (if m_errorTypeForLoose is set) or does nothing.
void checkLooseFeature(langutil::SourceLocation const& _location, std::string const& _description);
int m_stackHeight = 0;
yul::ExternalIdentifierAccess::Resolver m_resolver;
Scope* m_currentScope = nullptr;
/// Variables that are active at the current point in assembly (as opposed to
/// "part of the scope but not yet declared")
std::set<Scope::Variable const*> m_activeVariables;
AsmAnalysisInfo& m_info;
langutil::ErrorReporter& m_errorReporter;
dev::solidity::EVMVersion m_evmVersion;
Dialect m_dialect = Dialect::looseAssemblyForEVM();
boost::optional<langutil::Error::Type> m_errorTypeForLoose;
};
}
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