path: root/Compiler.h

/*
    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>
 * @date 2014
 * Solidity AST to EVM bytecode compiler.
 */

#include <ostream>
#include <functional>
#include <libsolidity/ASTVisitor.h>
#include <libsolidity/CompilerContext.h>

namespace dev {
namespace solidity {

class Compiler: private ASTConstVisitor
{
public:
    explicit Compiler(bool _optimize = false): m_optimize(_optimize), m_context(),
        m_returnTag(m_context.newTag()) {}

    void compileContract(ContractDefinition const& _contract,
                         std::map<ContractDefinition const*, bytes const*> const& _contracts);
    bytes getAssembledBytecode() { return m_context.getAssembledBytecode(m_optimize); }
    bytes getRuntimeBytecode() { return m_runtimeContext.getAssembledBytecode(m_optimize);}
    void streamAssembly(std::ostream& _stream) const { m_context.streamAssembly(_stream); }

private:
    /// Registers the non-function objects inside the contract with the context.
    void initializeContext(ContractDefinition const& _contract,
                           std::map<ContractDefinition const*, bytes const*> const& _contracts);
    /// Adds the code that is run at creation time. Should be run after exchanging the run-time context
    /// with a new and initialized context. Adds the constructor code.
    void packIntoContractCreator(ContractDefinition const& _contract, CompilerContext const& _runtimeContext);
    void appendBaseConstructorCall(FunctionDefinition const& _constructor,
                                   std::vector<ASTPointer<Expression>> const& _arguments);
    void appendConstructorCall(FunctionDefinition const& _constructor);
    void appendFunctionSelector(ContractDefinition const& _contract);
    /// Creates code that unpacks the arguments for the given function represented by a vector of TypePointers.
    /// From memory if @a _fromMemory is true, otherwise from call data. @returns the size of the data in bytes.
    unsigned appendCalldataUnpacker(TypePointers const& _typeParameters, bool _fromMemory = false);
    void appendReturnValuePacker(TypePointers const& _typeParameters);

    void registerStateVariables(ContractDefinition const& _contract);

    virtual bool visit(VariableDeclaration const& _variableDeclaration) override;
    virtual bool visit(FunctionDefinition const& _function) override;
    virtual bool visit(IfStatement const& _ifStatement) override;
    virtual bool visit(WhileStatement const& _whileStatement) override;
    virtual bool visit(ForStatement const& _forStatement) override;
    virtual bool visit(Continue const& _continue) override;
    virtual bool visit(Break const& _break) override;
    virtual bool visit(Return const& _return) override;
    virtual bool visit(VariableDefinition const& _variableDefinition) override;
    virtual bool visit(ExpressionStatement const& _expressionStatement) override;
    virtual bool visit(PlaceholderStatement const&) override;

    /// Appends one layer of function modifier code of the current function, or the function
    /// body itself if the last modifier was reached.
    void appendModifierOrFunctionCode();

    void compileExpression(Expression const& _expression, TypePointer const& _targetType = TypePointer());

    bool const m_optimize;
    CompilerContext m_context;
    CompilerContext m_runtimeContext;
    std::vector<eth::AssemblyItem> m_breakTags; ///< tag to jump to for a "break" statement
    std::vector<eth::AssemblyItem> m_continueTags; ///< tag to jump to for a "continue" statement
    eth::AssemblyItem m_returnTag; ///< tag to jump to for a "return" statement
    unsigned m_modifierDepth = 0;
    FunctionDefinition const* m_currentFunction;
    unsigned m_stackCleanupForReturn; ///< this number of stack elements need to be removed before jump to m_returnTag
};

}
}