solidity/libsolidity/codegen/ir/IRGeneratorForStatements.h

118 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/>.
*/
/**
* Component that translates Solidity code into Yul at statement level and below.
*/
#pragma once
#include <libsolidity/ast/ASTVisitor.h>
#include <libsolidity/codegen/ir/IRLValue.h>
namespace dev
{
namespace solidity
{
class IRGenerationContext;
class YulUtilFunctions;
/**
* Component that translates Solidity's AST into Yul at statement level and below.
* It is an AST visitor that appends to an internal string buffer.
*/
class IRGeneratorForStatements: public ASTConstVisitor
{
public:
IRGeneratorForStatements(IRGenerationContext& _context, YulUtilFunctions& _utils):
m_context(_context),
m_utils(_utils)
{}
std::string code() const;
/// Generates code to initialize the given state variable.
void initializeStateVar(VariableDeclaration const& _varDecl);
void endVisit(VariableDeclarationStatement const& _variableDeclaration) override;
bool visit(Assignment const& _assignment) override;
bool visit(TupleExpression const& _tuple) override;
bool visit(IfStatement const& _ifStatement) override;
bool visit(ForStatement const& _forStatement) override;
bool visit(WhileStatement const& _whileStatement) override;
bool visit(Continue const& _continueStatement) override;
bool visit(Break const& _breakStatement) override;
void endVisit(Return const& _return) override;
void endVisit(UnaryOperation const& _unaryOperation) override;
bool visit(BinaryOperation const& _binOp) override;
void endVisit(FunctionCall const& _funCall) override;
void endVisit(MemberAccess const& _memberAccess) override;
bool visit(InlineAssembly const& _inlineAsm) override;
void endVisit(IndexAccess const& _indexAccess) override;
void endVisit(IndexRangeAccess const& _indexRangeAccess) override;
void endVisit(Identifier const& _identifier) override;
bool visit(Literal const& _literal) override;
private:
/// Appends code to call an external function with the given arguments.
/// All involved expressions have already been visited.
void appendExternalFunctionCall(
FunctionCall const& _functionCall,
std::vector<ASTPointer<Expression const>> const& _arguments
);
std::string fetchFreeMem() const;
/// @returns a Yul expression representing the current value of @a _expression,
/// converted to type @a _to if it does not yet have that type.
std::string expressionAsType(Expression const& _expression, Type const& _to);
std::ostream& defineExpression(Expression const& _expression);
/// Defines only one of many variables corresponding to an expression.
/// We start counting at 1 instead of 0.
std::ostream& defineExpressionPart(Expression const& _expression, size_t _part);
void appendAndOrOperatorCode(BinaryOperation const& _binOp);
void appendSimpleUnaryOperation(UnaryOperation const& _operation, Expression const& _expr);
/// @returns code to perform the given binary operation in the given type on the two values.
std::string binaryOperation(
langutil::Token _op,
Type const& _type,
std::string const& _left,
std::string const& _right
);
void setLValue(Expression const& _expression, std::unique_ptr<IRLValue> _lvalue);
void generateLoop(
Statement const& _body,
Expression const* _conditionExpression,
Statement const* _initExpression = nullptr,
ExpressionStatement const* _loopExpression = nullptr,
bool _isDoWhile = false
);
static Type const& type(Expression const& _expression);
std::ostringstream m_code;
IRGenerationContext& m_context;
YulUtilFunctions& m_utils;
std::unique_ptr<IRLValue> m_currentLValue;
};
}
}