solidity/libyul/AsmAnalysis.h

126 lines
4.1 KiB
C++

/*
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 <libyul/backends/evm/EVMDialect.h>
#include <functional>
#include <list>
#include <memory>
#include <optional>
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:
explicit AsmAnalyzer(
AsmAnalysisInfo& _analysisInfo,
langutil::ErrorReporter& _errorReporter,
Dialect const& _dialect,
ExternalIdentifierAccess::Resolver const& _resolver = ExternalIdentifierAccess::Resolver(),
std::set<YulString> const& _dataNames = {}
):
m_resolver(_resolver),
m_info(_analysisInfo),
m_errorReporter(_errorReporter),
m_dialect(_dialect),
m_dataNames(_dataNames)
{
if (EVMDialect const* evmDialect = dynamic_cast<EVMDialect const*>(&m_dialect))
m_evmVersion = evmDialect->evmVersion();
}
bool analyze(Block const& _block);
/// Performs analysis on the outermost code of the given object and returns the analysis info.
/// Asserts on failure.
static AsmAnalysisInfo analyzeStrictAssertCorrect(Dialect const& _dialect, Object const& _object);
bool operator()(Instruction const&);
bool operator()(Literal const& _literal);
bool operator()(Identifier const&);
bool operator()(ExpressionStatement 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()(Break const&);
bool operator()(Continue const&);
bool operator()(Leave const&);
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);
bool warnOnInstructions(dev::eth::Instruction _instr, langutil::SourceLocation const& _location);
bool warnOnInstructions(std::string const& _instrIdentifier, langutil::SourceLocation const& _location);
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;
langutil::EVMVersion m_evmVersion;
Dialect const& m_dialect;
/// Names of data objects to be referenced by builtin functions with literal arguments.
std::set<YulString> m_dataNames;
ForLoop const* m_currentForLoop = nullptr;
};
}