/*
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.
*/
#pragma once
#include <ostream>
#include <functional>
#include <libsolidity/ASTVisitor.h>
#include <libsolidity/CompilerContext.h>
#include <libevmasm/Assembly.h>
namespace dev {
namespace solidity {
class Compiler: private ASTConstVisitor
{
public:
explicit Compiler(bool _optimize = false, unsigned _runs = 200):
m_optimize(_optimize),
m_optimizeRuns(_runs),
m_context(),
m_returnTag(m_context.newTag())
{
}
void compileContract(
ContractDefinition const& _contract,
std::map<ContractDefinition const*, eth::Assembly const*> const& _contracts
);
/// Compiles a contract that uses CALLCODE to call into a pre-deployed version of the given
/// contract at runtime, but contains the full creation-time code.
void compileClone(
ContractDefinition const& _contract,
std::map<ContractDefinition const*, eth::Assembly const*> const& _contracts
);
eth::Assembly const& assembly() { return m_context.assembly(); }
eth::LinkerObject assembledObject() { return m_context.assembledObject(); }
eth::LinkerObject runtimeObject() { return m_context.assembledRuntimeObject(m_runtimeSub); }
/// @arg _sourceCodes is the map of input files to source code strings
/// @arg _inJsonFromat shows whether the out should be in Json format
Json::Value streamAssembly(std::ostream& _stream, StringMap const& _sourceCodes = StringMap(), bool _inJsonFormat = false) const
{
return m_context.streamAssembly(_stream, _sourceCodes, _inJsonFormat);
}
/// @returns Assembly items of the normal compiler context
eth::AssemblyItems const& assemblyItems() const { return m_context.assembly().items(); }
/// @returns Assembly items of the runtime compiler context
eth::AssemblyItems const& runtimeAssemblyItems() const { return m_context.assembly().sub(m_runtimeSub).items(); }
/// @returns the entry label of the given function. Might return an AssemblyItem of type
/// UndefinedItem if it does not exist yet.
eth::AssemblyItem functionEntryLabel(FunctionDefinition const& _function) const;
private:
/// Registers the non-function objects inside the contract with the context.
void initializeContext(
ContractDefinition const& _contract,
std::map<ContractDefinition const*, eth::Assembly const*> const& _compiledContracts
);
/// 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);
/// Appends state variable initialisation and constructor code.
void appendInitAndConstructorCode(ContractDefinition const& _contract);
void appendBaseConstructor(FunctionDefinition const& _constructor);
void appendConstructor(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.
/// Expects source offset on the stack.
void appendCalldataUnpacker(
TypePointers const& _typeParameters,
bool _fromMemory = false,
u256 _startOffset = u256(-1)
);
void appendReturnValuePacker(TypePointers const& _typeParameters);
void registerStateVariables(ContractDefinition const& _contract);
void initializeStateVariables(ContractDefinition const& _contract);
/// Initialises all memory arrays in the local variables to point to an empty location.
void initialiseMemoryArrays(std::vector<VariableDeclaration const*> _variables);
/// Pushes the initialised value of the given type to the stack. If the type is a memory
/// reference type, allocates memory and pushes the memory pointer.
/// Not to be used for storage references.
void initialiseInMemory(Type const& _type);
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(Throw const& _throw) override;
virtual bool visit(VariableDeclarationStatement const& _variableDeclarationStatement) override;
virtual bool visit(ExpressionStatement const& _expressionStatement) override;
virtual bool visit(PlaceholderStatement const&) override;
/// Repeatedly visits all function which are referenced but which are not compiled yet.
void appendFunctionsWithoutCode();
/// 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 appendStackVariableInitialisation(VariableDeclaration const& _variable);
void compileExpression(Expression const& _expression, TypePointer const& _targetType = TypePointer());
/// @returns the runtime assembly for clone contracts.
static eth::Assembly cloneRuntime();
bool const m_optimize;
unsigned const m_optimizeRuns;
CompilerContext m_context;
size_t m_runtimeSub = size_t(-1); ///< Identifier of the runtime sub-assembly
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 = nullptr;
unsigned m_stackCleanupForReturn = 0; ///< this number of stack elements need to be removed before jump to m_returnTag
// arguments for base constructors, filled in derived-to-base order
std::map<FunctionDefinition const*, std::vector<ASTPointer<Expression>> const*> m_baseArguments;
};
}
}
