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Diffstat (limited to 'ExpressionCompiler.h')
| -rw-r--r-- | ExpressionCompiler.h | 180 |
1 files changed, 0 insertions, 180 deletions
diff --git a/ExpressionCompiler.h b/ExpressionCompiler.h deleted file mode 100644 index 471d8186..00000000 --- a/ExpressionCompiler.h +++ /dev/null @@ -1,180 +0,0 @@ -/* - This file is part of cpp-ethereum. - - cpp-ethereum 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. - - cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>. -*/ -/** - * @author Christian <c@ethdev.com> - * @author Gav Wood <g@ethdev.com> - * @date 2014 - * Solidity AST to EVM bytecode compiler for expressions. - */ - -#include <functional> -#include <memory> -#include <boost/noncopyable.hpp> -#include <libdevcore/Common.h> -#include <libsolidity/BaseTypes.h> -#include <libsolidity/ASTVisitor.h> - -namespace dev { -namespace eth -{ -class AssemblyItem; // forward -} -namespace solidity { - -// forward declarations -class CompilerContext; -class Type; -class IntegerType; -class ByteArrayType; -class StaticStringType; - -/** - * Compiler for expressions, i.e. converts an AST tree whose root is an Expression into a stream - * of EVM instructions. It needs a compiler context that is the same for the whole compilation - * unit. - */ -class ExpressionCompiler: private ASTConstVisitor -{ -public: - /// Compile the given @a _expression into the @a _context. - static void compileExpression(CompilerContext& _context, Expression const& _expression, bool _optimize = false); - - /// Appends code to remove dirty higher order bits in case of an implicit promotion to a wider type. - static void appendTypeConversion(CompilerContext& _context, Type const& _typeOnStack, - Type const& _targetType, bool _cleanupNeeded = false); - /// Appends code for a State Variable accessor function - static void appendStateVariableAccessor(CompilerContext& _context, VariableDeclaration const& _varDecl, bool _optimize = false); - -private: - explicit ExpressionCompiler(CompilerContext& _compilerContext, bool _optimize = false): - m_optimize(_optimize), m_context(_compilerContext), m_currentLValue(m_context) {} - - virtual bool visit(Assignment const& _assignment) override; - virtual bool visit(UnaryOperation const& _unaryOperation) override; - virtual bool visit(BinaryOperation const& _binaryOperation) override; - virtual bool visit(FunctionCall const& _functionCall) override; - virtual bool visit(NewExpression const& _newExpression) override; - virtual void endVisit(MemberAccess const& _memberAccess) override; - virtual bool visit(IndexAccess const& _indexAccess) override; - virtual void endVisit(Identifier const& _identifier) override; - virtual void endVisit(Literal const& _literal) override; - - ///@{ - ///@name Append code for various operator types - void appendAndOrOperatorCode(BinaryOperation const& _binaryOperation); - void appendCompareOperatorCode(Token::Value _operator, Type const& _type); - void appendOrdinaryBinaryOperatorCode(Token::Value _operator, Type const& _type); - - void appendArithmeticOperatorCode(Token::Value _operator, Type const& _type); - void appendBitOperatorCode(Token::Value _operator); - void appendShiftOperatorCode(Token::Value _operator); - /// @} - - /// Appends an implicit or explicit type conversion. For now this comprises only erasing - /// higher-order bits (@see appendHighBitCleanup) when widening integer. - /// If @a _cleanupNeeded, high order bits cleanup is also done if no type conversion would be - /// necessary. - void appendTypeConversion(Type const& _typeOnStack, Type const& _targetType, bool _cleanupNeeded = false); - //// Appends code that cleans higher-order bits for integer types. - void appendHighBitsCleanup(IntegerType const& _typeOnStack); - - /// Appends code to call a function of the given type with the given arguments. - void appendExternalFunctionCall(FunctionType const& _functionType, std::vector<ASTPointer<Expression const>> const& _arguments, - bool bare = false); - /// Appends code that evaluates the given arguments and moves the result to memory. The memory offset is - /// expected to be on the stack and is updated by this call. - void appendArgumentsCopyToMemory(std::vector<ASTPointer<Expression const>> const& _arguments, - TypePointers const& _types = {}, - bool _padToWordBoundaries = true, - bool _padExceptionIfFourBytes = false); - /// Appends code that moves a stack element of the given type to memory. The memory offset is - /// expected below the stack element and is updated by this call. - void appendTypeMoveToMemory(Type const& _type, bool _padToWordBoundaries = true); - /// Appends code that evaluates a single expression and moves the result to memory. The memory offset is - /// expected to be on the stack and is updated by this call. - void appendExpressionCopyToMemory(Type const& _expectedType, Expression const& _expression); - - /// Appends code for a State Variable accessor function - void appendStateVariableAccessor(VariableDeclaration const& _varDecl); - - /** - * Helper class to store and retrieve lvalues to and from various locations. - * All types except STACK store a reference in a slot on the stack, STACK just - * stores the base stack offset of the variable in @a m_baseStackOffset. - */ - class LValue - { - public: - enum class LValueType { None, Stack, Memory, Storage }; - - explicit LValue(CompilerContext& _compilerContext): m_context(&_compilerContext) { reset(); } - LValue(CompilerContext& _compilerContext, LValueType _type, - std::shared_ptr<Type const> const& _dataType, unsigned _baseStackOffset = 0); - - /// Set type according to the declaration and retrieve the reference. - /// @a _expression is the current expression - void fromIdentifier(Identifier const& _identifier, Declaration const& _declaration); - void reset() { m_type = LValueType::None; m_dataType.reset(); m_baseStackOffset = 0; m_size = 0; } - - bool isValid() const { return m_type != LValueType::None; } - bool isInOnStack() const { return m_type == LValueType::Stack; } - bool isInMemory() const { return m_type == LValueType::Memory; } - bool isInStorage() const { return m_type == LValueType::Storage; } - - /// @returns true if this lvalue reference type occupies a slot on the stack. - bool storesReferenceOnStack() const { return m_type == LValueType::Storage || m_type == LValueType::Memory; } - - /// Copies the value of the current lvalue to the top of the stack and, if @a _remove is true, - /// also removes the reference from the stack (note that is does not reset the type to @a NONE). - /// @a _location source location of the current expression, used for error reporting. - void retrieveValue(Location const& _location, bool _remove = false) const; - /// Moves a value from the stack to the lvalue. Removes the value if @a _move is true. - /// @a _location is the source location of the expression that caused this operation. - /// Stack pre: value [lvalue_ref] - /// Stack post if !_move: value_of(lvalue_ref) - void storeValue(Type const& _sourceType, Location const& _location = Location(), bool _move = false) const; - /// Stores zero in the lvalue. - /// @a _location is the source location of the requested operation - void setToZero(Location const& _location = Location()) const; - /// Convenience function to convert the stored reference to a value and reset type to NONE if - /// the reference was not requested by @a _expression. - void retrieveValueIfLValueNotRequested(Expression const& _expression); - - private: - /// Convenience function to retrieve Value from Storage. Specific version of @ref retrieveValue - void retrieveValueFromStorage(bool _remove = false) const; - /// Copies from a byte array to a byte array in storage, both references on the stack. - void copyByteArrayToStorage(ByteArrayType const& _targetType, ByteArrayType const& _sourceType) const; - - CompilerContext* m_context; - LValueType m_type = LValueType::None; - std::shared_ptr<Type const> m_dataType; - /// If m_type is STACK, this is base stack offset (@see - /// CompilerContext::getBaseStackOffsetOfVariable) of a local variable. - unsigned m_baseStackOffset = 0; - /// Size of the value of this lvalue on the stack or the storage. - unsigned m_size = 0; - }; - - bool m_optimize; - CompilerContext& m_context; - LValue m_currentLValue; -}; - - -} -} |