mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
144 lines
6.0 KiB
C++
144 lines
6.0 KiB
C++
/*
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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 <boost/noncopyable.hpp>
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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):
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m_context(_compilerContext), m_currentLValue(m_context) {}
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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 bool visit(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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/**
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* Helper class to store and retrieve lvalues to and from various locations.
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* All types except STACK store a reference in a slot on the stack, STACK just
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* stores the base stack offset of the variable in @a m_baseStackOffset.
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*/
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class LValue
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{
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public:
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enum LValueType { NONE, STACK, MEMORY, STORAGE };
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explicit LValue(CompilerContext& _compilerContext): m_context(&_compilerContext) { reset(); }
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LValue(CompilerContext& _compilerContext, LValueType _type, unsigned _baseStackOffset = 0):
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m_context(&_compilerContext), m_type(_type), m_baseStackOffset(_baseStackOffset) {}
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/// Set type according to the declaration and retrieve the reference.
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/// @a _expression is the current expression
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void fromIdentifier(Identifier const& _identifier, Declaration const& _declaration);
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void reset() { m_type = NONE; m_baseStackOffset = 0; }
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bool isValid() const { return m_type != NONE; }
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bool isInOnStack() const { return m_type == STACK; }
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bool isInMemory() const { return m_type == MEMORY; }
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bool isInStorage() const { return m_type == STORAGE; }
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/// @returns true if this lvalue reference type occupies a slot on the stack.
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bool storesReferenceOnStack() const { return m_type == STORAGE || m_type == MEMORY; }
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/// Copies the value of the current lvalue to the top of the stack and, if @a _remove is true,
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/// also removes the reference from the stack (note that is does not reset the type to @a NONE).
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/// @a _expression is the current expression, used for error reporting.
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void retrieveValue(Expression const& _expression, bool _remove = false) const;
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/// Stores a value (from the stack directly beneath the reference, which is assumed to
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/// be on the top of the stack, if any) in the lvalue and removes the reference.
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/// Also removes the stored value from the stack if @a _move is
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/// true. @a _expression is the current expression, used for error reporting.
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void storeValue(Expression const& _expression, bool _move = false) const;
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/// Convenience function to convert the stored reference to a value and reset type to NONE if
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/// the reference was not requested by @a _expression.
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void retrieveValueIfLValueNotRequested(Expression const& _expression);
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private:
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CompilerContext* m_context;
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LValueType m_type;
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/// If m_type is STACK, this is base stack offset (@see
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/// CompilerContext::getBaseStackOffsetOfVariable) of a local variable.
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unsigned m_baseStackOffset;
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};
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CompilerContext& m_context;
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LValue m_currentLValue;
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/// If a "virtual" function (i.e. a bulit-in function without jump tag) is encountered, the
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/// actual function is stored here. @todo prevent assignment or store it with assignment
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enum class SpecialFunction { NONE, SEND, SHA3, SUICIDE, ECRECOVER, SHA256, RIPEMD160 };
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SpecialFunction m_currentSpecialFunction;
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};
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}
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}
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