mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
e2711b7fab
Code generators needed fixing of the cleanup process during typecasting of bytes and integers
251 lines
9.6 KiB
C++
251 lines
9.6 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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// SPDX-License-Identifier: GPL-3.0
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/**
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* Component that translates Solidity code into Yul at statement level and below.
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*/
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#pragma once
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#include <libsolidity/ast/ASTVisitor.h>
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#include <libsolidity/codegen/ir/IRLValue.h>
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#include <libsolidity/codegen/ir/IRVariable.h>
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#include <functional>
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namespace solidity::frontend
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{
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class IRGenerationContext;
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class YulUtilFunctions;
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/**
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* Base class for the statement generator.
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* Encapsulates access to the yul code stream and handles source code locations.
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*/
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class IRGeneratorForStatementsBase: public ASTConstVisitor
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{
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public:
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IRGeneratorForStatementsBase(IRGenerationContext& _context):
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m_context(_context)
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{}
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virtual std::string code() const;
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std::ostringstream& appendCode(bool _addLocationComment = true);
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protected:
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void setLocation(ASTNode const& _node);
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langutil::SourceLocation m_currentLocation = {};
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langutil::SourceLocation m_lastLocation = {};
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IRGenerationContext& m_context;
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private:
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std::ostringstream m_code;
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};
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/**
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* Component that translates Solidity's AST into Yul at statement level and below.
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* It is an AST visitor that appends to an internal string buffer.
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*/
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class IRGeneratorForStatements: public IRGeneratorForStatementsBase
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{
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public:
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IRGeneratorForStatements(
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IRGenerationContext& _context,
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YulUtilFunctions& _utils,
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std::function<std::string()> _placeholderCallback = {}
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):
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IRGeneratorForStatementsBase(_context),
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m_placeholderCallback(std::move(_placeholderCallback)),
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m_utils(_utils)
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{}
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std::string code() const override;
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/// Generate the code for the statements in the block;
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void generate(Block const& _block);
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/// Generates code to initialize the given state variable.
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void initializeStateVar(VariableDeclaration const& _varDecl);
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/// Generates code to initialize the given local variable.
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void initializeLocalVar(VariableDeclaration const& _varDecl);
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/// Calculates expression's value and returns variable where it was stored
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IRVariable evaluateExpression(Expression const& _expression, Type const& _to);
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/// Defines @a _var using the value of @a _value while performing type conversions, if required.
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void define(IRVariable const& _var, IRVariable const& _value)
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{
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bool _declare = true;
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declareAssign(_var, _value, _declare);
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}
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/// Defines @a _var using the value of @a _value while performing type conversions, if required.
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/// It also cleans the value of the variable.
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void defineAndCleanup(IRVariable const& _var, IRVariable const& _value)
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{
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bool _forceCleanup = true;
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bool _declare = true;
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declareAssign(_var, _value, _declare, _forceCleanup);
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}
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/// @returns the name of a function that computes the value of the given constant
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/// and also generates the function.
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std::string constantValueFunction(VariableDeclaration const& _constant);
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void endVisit(VariableDeclarationStatement const& _variableDeclaration) override;
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bool visit(Conditional const& _conditional) override;
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bool visit(Assignment const& _assignment) override;
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bool visit(TupleExpression const& _tuple) override;
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void endVisit(PlaceholderStatement const& _placeholder) override;
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bool visit(Block const& _block) override;
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void endVisit(Block const& _block) override;
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bool visit(IfStatement const& _ifStatement) override;
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bool visit(ForStatement const& _forStatement) override;
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bool visit(WhileStatement const& _whileStatement) override;
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bool visit(Continue const& _continueStatement) override;
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bool visit(Break const& _breakStatement) override;
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void endVisit(Return const& _return) override;
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bool visit(UnaryOperation const& _unaryOperation) override;
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bool visit(BinaryOperation const& _binOp) override;
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void endVisit(FunctionCall const& _funCall) override;
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void endVisit(FunctionCallOptions const& _funCallOptions) override;
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bool visit(MemberAccess const& _memberAccess) override;
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void endVisit(MemberAccess const& _memberAccess) override;
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bool visit(InlineAssembly const& _inlineAsm) override;
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void endVisit(IndexAccess const& _indexAccess) override;
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void endVisit(IndexRangeAccess const& _indexRangeAccess) override;
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void endVisit(Identifier const& _identifier) override;
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bool visit(Literal const& _literal) override;
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bool visit(TryStatement const& _tryStatement) override;
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bool visit(TryCatchClause const& _tryCatchClause) override;
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private:
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/// Handles all catch cases of a try statement, except the success-case.
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void handleCatch(TryStatement const& _tryStatement);
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void handleCatchFallback(TryCatchClause const& _fallback);
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/// Generates code to revert with an error. The error arguments are assumed to
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/// be already evaluated and available in local IRVariables, but not yet
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/// converted.
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void revertWithError(
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std::string const& _signature,
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std::vector<Type const*> const& _parameterTypes,
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std::vector<ASTPointer<Expression const>> const& _errorArguments
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);
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void handleVariableReference(
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VariableDeclaration const& _variable,
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Expression const& _referencingExpression
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);
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/// Appends code to call an external function with the given arguments.
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/// All involved expressions have already been visited.
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void appendExternalFunctionCall(
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FunctionCall const& _functionCall,
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std::vector<ASTPointer<Expression const>> const& _arguments
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);
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/// Appends code for .call / .delegatecall / .staticcall.
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/// All involved expressions have already been visited.
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void appendBareCall(
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FunctionCall const& _functionCall,
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std::vector<ASTPointer<Expression const>> const& _arguments
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);
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/// Requests and assigns the internal ID of the referenced function to the referencing
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/// expression and adds the function to the internal dispatch.
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/// If the function is called right away, it does nothing.
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void assignInternalFunctionIDIfNotCalledDirectly(
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Expression const& _expression,
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FunctionDefinition const& _referencedFunction
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);
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/// Generates the required conversion code and @returns an IRVariable referring to the value of @a _variable
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IRVariable convert(IRVariable const& _variable, Type const& _to);
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/// Generates the required conversion code and @returns an IRVariable referring to the value of @a _variable
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/// It also cleans the value of the variable.
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IRVariable convertAndCleanup(IRVariable const& _from, Type const& _to);
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/// @returns a Yul expression representing the current value of @a _expression,
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/// converted to type @a _to if it does not yet have that type.
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std::string expressionAsType(Expression const& _expression, Type const& _to);
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/// @returns a Yul expression representing the current value of @a _expression,
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/// converted to type @a _to if it does not yet have that type.
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/// It also cleans the value, in case it already has type @a _to.
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std::string expressionAsCleanedType(Expression const& _expression, Type const& _to);
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/// @returns an output stream that can be used to define @a _var using a function call or
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/// single stack slot expression.
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std::ostream& define(IRVariable const& _var);
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/// Assigns @a _var to the value of @a _value while performing type conversions, if required.
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void assign(IRVariable const& _var, IRVariable const& _value) { declareAssign(_var, _value, false); }
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/// Declares variable @a _var.
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void declare(IRVariable const& _var);
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void declareAssign(IRVariable const& _var, IRVariable const& _value, bool _define, bool _forceCleanup = false);
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/// @returns an IRVariable with the zero
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/// value of @a _type.
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/// @param _splitFunctionTypes if false, returns two zeroes
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IRVariable zeroValue(Type const& _type, bool _splitFunctionTypes = true);
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void appendAndOrOperatorCode(BinaryOperation const& _binOp);
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void appendSimpleUnaryOperation(UnaryOperation const& _operation, Expression const& _expr);
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/// @returns code to perform the given binary operation in the given type on the two values.
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std::string binaryOperation(
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langutil::Token _op,
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Type const& _type,
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std::string const& _left,
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std::string const& _right
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);
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/// @returns code to perform the given shift operation.
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/// The operation itself will be performed in the type of the value,
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/// while the amount to shift can have its own type.
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std::string shiftOperation(langutil::Token _op, IRVariable const& _value, IRVariable const& _shiftAmount);
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/// Assigns the value of @a _value to the lvalue @a _lvalue.
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void writeToLValue(IRLValue const& _lvalue, IRVariable const& _value);
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/// @returns a fresh IR variable containing the value of the lvalue @a _lvalue.
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IRVariable readFromLValue(IRLValue const& _lvalue);
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/// Stores the given @a _lvalue in m_currentLValue, if it will be written to (willBeWrittenTo). Otherwise
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/// defines the expression @a _expression by reading the value from @a _lvalue.
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void setLValue(Expression const& _expression, IRLValue _lvalue);
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void generateLoop(
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Statement const& _body,
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Expression const* _conditionExpression,
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Statement const* _initExpression = nullptr,
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ExpressionStatement const* _loopExpression = nullptr,
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bool _isDoWhile = false
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);
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static Type const& type(Expression const& _expression);
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std::string linkerSymbol(ContractDefinition const& _library) const;
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std::function<std::string()> m_placeholderCallback;
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YulUtilFunctions& m_utils;
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std::optional<IRLValue> m_currentLValue;
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};
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}
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