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117 lines
4.4 KiB
117 lines
4.4 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum 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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cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @author Christian <c@ethdev.com>
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* @date 2014
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* Solidity AST to EVM bytecode compiler for expressions.
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*/
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#include <libdevcore/Common.h>
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#include <libsolidity/ASTVisitor.h>
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namespace dev {
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namespace eth
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{
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class AssemblyItem; // forward
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}
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namespace solidity {
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class CompilerContext; // forward
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class Type; // forward
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class IntegerType; // forward
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/**
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* Compiler for expressions, i.e. converts an AST tree whose root is an Expression into a stream
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* of EVM instructions. It needs a compiler context that is the same for the whole compilation
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* unit.
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*/
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class ExpressionCompiler: private ASTVisitor
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{
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public:
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/// Compile the given @a _expression into the @a _context.
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static void compileExpression(CompilerContext& _context, Expression& _expression);
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/// Appends code to remove dirty higher order bits in case of an implicit promotion to a wider type.
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static void appendTypeConversion(CompilerContext& _context, Type const& _typeOnStack, Type const& _targetType);
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private:
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ExpressionCompiler(CompilerContext& _compilerContext): m_context(_compilerContext) {}
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virtual bool visit(Assignment& _assignment) override;
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virtual void endVisit(UnaryOperation& _unaryOperation) override;
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virtual bool visit(BinaryOperation& _binaryOperation) override;
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virtual bool visit(FunctionCall& _functionCall) override;
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virtual void endVisit(MemberAccess& _memberAccess) override;
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virtual void endVisit(IndexAccess& _indexAccess) override;
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virtual void endVisit(Identifier& _identifier) override;
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virtual void endVisit(Literal& _literal) override;
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///@{
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///@name Append code for various operator types
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void appendAndOrOperatorCode(BinaryOperation& _binaryOperation);
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void appendCompareOperatorCode(Token::Value _operator, Type const& _type);
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void appendOrdinaryBinaryOperatorCode(Token::Value _operator, Type const& _type);
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void appendArithmeticOperatorCode(Token::Value _operator, Type const& _type);
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void appendBitOperatorCode(Token::Value _operator);
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void appendShiftOperatorCode(Token::Value _operator);
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/// @}
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/// Appends an implicit or explicit type conversion. For now this comprises only erasing
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/// higher-order bits (@see appendHighBitCleanup) when widening integer types.
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/// If @a _cleanupNeeded, high order bits cleanup is also done if no type conversion would be
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/// necessary.
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void appendTypeConversion(Type const& _typeOnStack, Type const& _targetType, bool _cleanupNeeded = false);
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//// Appends code that cleans higher-order bits for integer types.
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void appendHighBitsCleanup(IntegerType const& _typeOnStack);
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/// Copies the value of the current lvalue to the top of the stack.
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void retrieveLValueValue(Expression const& _expression);
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/// Stores the value on top of the stack in the current lvalue. Removes it from the stack if
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/// @a _move is true.
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void storeInLValue(Expression const& _expression, bool _move = false);
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/**
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* Location of an lvalue, either in code (for a function) on the stack, in the storage or memory.
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*/
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struct LValueLocation
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{
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enum LocationType { INVALID, CODE, STACK, MEMORY, STORAGE };
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LValueLocation() { reset(); }
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LValueLocation(LocationType _type, u256 const& _location): locationType(_type), location(_location) {}
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void reset() { locationType = INVALID; location = 0; }
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bool isValid() const { return locationType != INVALID; }
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bool isInCode() const { return locationType == CODE; }
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bool isInOnStack() const { return locationType == STACK; }
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bool isInMemory() const { return locationType == MEMORY; }
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bool isInStorage() const { return locationType == STORAGE; }
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LocationType locationType;
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/// Depending on the type, this is the id of a tag (code), the base offset of a stack
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/// variable (@see CompilerContext::getBaseStackOffsetOfVariable) or the offset in
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/// storage or memory.
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u256 location;
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};
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LValueLocation m_currentLValue;
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CompilerContext& m_context;
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};
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}
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}
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