File reorganisation.

1 files changed, 138 insertions, 0 deletions

diff --git a/libsolidity/codegen/ExpressionCompiler.h b/libsolidity/codegen/ExpressionCompiler.h
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+/*
+	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 <libevmasm/SourceLocation.h>
+#include <libsolidity/ast/ASTVisitor.h>
+#include <libsolidity/codegen/LValue.h>
+#include <libsolidity/interface/Utils.h>
+
+namespace dev {
+namespace eth
+{
+class AssemblyItem; // forward
+}
+namespace solidity {
+
+// forward declarations
+class CompilerContext;
+class CompilerUtils;
+class Type;
+class IntegerType;
+class ArrayType;
+
+/**
+ * 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:
+	/// Appends code for a State Variable accessor function
+	static void appendStateVariableAccessor(CompilerContext& _context, VariableDeclaration const& _varDecl, bool _optimize = false);
+
+	explicit ExpressionCompiler(CompilerContext& _compilerContext, bool _optimize = false):
+		m_optimize(_optimize), m_context(_compilerContext) {}
+
+	/// Compile the given @a _expression and leave its value on the stack.
+	void compile(Expression const& _expression);
+
+	/// Appends code to set a state variable to its initial value/expression.
+	void appendStateVariableInitialization(VariableDeclaration const& _varDecl);
+
+	/// Appends code for a State Variable accessor function
+	void appendStateVariableAccessor(VariableDeclaration const& _varDecl);
+
+	/// Appends code for a Constant State Variable accessor function
+	void appendConstStateVariableAccessor(const VariableDeclaration& _varDecl);
+
+private:
+	virtual bool visit(Assignment const& _assignment) override;
+	virtual bool visit(TupleExpression const& _tuple) 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 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
+	);
+	/// 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);
+
+	/// Sets the current LValue to a new one (of the appropriate type) from the given declaration.
+	/// Also retrieves the value if it was not requested by @a _expression.
+	void setLValueFromDeclaration(Declaration const& _declaration, Expression const& _expression);
+	/// Sets the current LValue to a StorageItem holding the type of @a _expression. The reference is assumed
+	/// to be on the stack.
+	/// Also retrieves the value if it was not requested by @a _expression.
+	void setLValueToStorageItem(Expression const& _expression);
+	/// Sets the current LValue to a new LValue constructed from the arguments.
+	/// Also retrieves the value if it was not requested by @a _expression.
+	template <class _LValueType, class... _Arguments>
+	void setLValue(Expression const& _expression, _Arguments const&... _arguments);
+
+	/// @returns the CompilerUtils object containing the current context.
+	CompilerUtils utils();
+
+	bool m_optimize;
+	CompilerContext& m_context;
+	std::unique_ptr<LValue> m_currentLValue;
+
+};
+
+template <class _LValueType, class... _Arguments>
+void ExpressionCompiler::setLValue(Expression const& _expression, _Arguments const&... _arguments)
+{
+	solAssert(!m_currentLValue, "Current LValue not reset before trying to set new one.");
+	std::unique_ptr<_LValueType> lvalue(new _LValueType(m_context, _arguments...));
+	if (_expression.annotation().lValueRequested)
+		m_currentLValue = move(lvalue);
+	else
+		lvalue->retrieveValue(_expression.location(), true);
+}
+
+}
+}