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/*
This file is part of solidity.
solidity 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.
solidity 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 solidity. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @author Christian <c@ethdev.com>
* @date 2014
* Code generator for contracts.
*/
#pragma once
#include <libsolidity/ast/ASTVisitor.h>
#include <libsolidity/codegen/CompilerContext.h>
#include <libevmasm/Assembly.h>
#include <functional>
#include <ostream>
namespace dev {
namespace solidity {
/**
* Code generator at the contract level. Can be used to generate code for exactly one contract
* either either in "runtime mode" or "creation mode".
*/
class ContractCompiler: private ASTConstVisitor
{
public:
explicit ContractCompiler(ContractCompiler* _runtimeCompiler, CompilerContext& _context, bool _optimise, size_t _optimise_runs = 200):
m_optimise(_optimise),
m_optimise_runs(_optimise_runs),
m_runtimeCompiler(_runtimeCompiler),
m_context(_context)
{
m_context = CompilerContext(_context.evmVersion(), _runtimeCompiler ? &_runtimeCompiler->m_context : nullptr);
}
void compileContract(
ContractDefinition const& _contract,
std::map<ContractDefinition const*, eth::Assembly const*> const& _contracts
);
/// Compiles the constructor part of the contract.
/// @returns the identifier of the runtime sub-assembly.
size_t compileConstructor(
ContractDefinition const& _contract,
std::map<ContractDefinition const*, eth::Assembly const*> const& _contracts
);
private:
/// Registers the non-function objects inside the contract with the context and stores the basic
/// information about the contract like the AST annotations.
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.
/// @returns the identifier of the runtime sub assembly
size_t packIntoContractCreator(ContractDefinition const& _contract);
/// Appends code that deploys the given contract as a library.
/// Will also add code that modifies the contract in memory by injecting the current address
/// for the call protector.
size_t deployLibrary(ContractDefinition const& _contract);
/// Appends state variable initialisation and constructor code.
void appendInitAndConstructorCode(ContractDefinition const& _contract);
void appendBaseConstructor(FunctionDefinition const& _constructor);
void appendConstructor(FunctionDefinition const& _constructor);
/// Appends code that returns a boolean flag on the stack that tells whether
/// the contract has been called via delegatecall (false) or regular call (true).
/// This is done by inserting a specific push constant as the first instruction
/// whose data will be modified in memory at deploy time.
void appendDelegatecallCheck();
/// Appends the function selector. Is called recursively to create a binary search tree.
/// @a _runs the number of intended executions of the contract to tune the split point.
void appendInternalSelector(
std::map<FixedHash<4>, eth::AssemblyItem const> const& _entryPoints,
std::vector<FixedHash<4>> const& _ids,
eth::AssemblyItem const& _notFoundTag,
size_t _runs
);
void appendFunctionSelector(ContractDefinition const& _contract);
void appendCallValueCheck();
void appendReturnValuePacker(TypePointers const& _typeParameters, bool _isLibrary);
void registerStateVariables(ContractDefinition const& _contract);
void initializeStateVariables(ContractDefinition const& _contract);
bool visit(VariableDeclaration const& _variableDeclaration) override;
bool visit(FunctionDefinition const& _function) override;
bool visit(InlineAssembly const& _inlineAssembly) override;
bool visit(IfStatement const& _ifStatement) override;
bool visit(WhileStatement const& _whileStatement) override;
bool visit(ForStatement const& _forStatement) override;
bool visit(Continue const& _continueStatement) override;
bool visit(Break const& _breakStatement) override;
bool visit(Return const& _return) override;
bool visit(Throw const& _throw) override;
bool visit(EmitStatement const& _emit) override;
bool visit(VariableDeclarationStatement const& _variableDeclarationStatement) override;
bool visit(ExpressionStatement const& _expressionStatement) override;
bool visit(PlaceholderStatement const&) override;
bool visit(Block const& _block) override;
void endVisit(Block const& _block) override;
/// Repeatedly visits all function which are referenced but which are not compiled yet.
void appendMissingFunctions();
/// 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());
/// Frees the variables of a certain scope (to be used when leaving).
void popScopedVariables(ASTNode const* _node);
/// Sets the stack height for the visited loop.
void storeStackHeight(ASTNode const* _node);
bool const m_optimise;
size_t const m_optimise_runs = 200;
/// Pointer to the runtime compiler in case this is a creation compiler.
ContractCompiler* m_runtimeCompiler = nullptr;
CompilerContext& m_context;
/// Tag to jump to for a "break" statement and the stack height after freeing the local loop variables.
std::vector<std::pair<eth::AssemblyItem, unsigned>> m_breakTags;
/// Tag to jump to for a "continue" statement and the stack height after freeing the local loop variables.
std::vector<std::pair<eth::AssemblyItem, unsigned>> m_continueTags;
/// Tag to jump to for a "return" statement and the stack height after freeing the local function or modifier variables.
/// Needs to be stacked because of modifiers.
std::vector<std::pair<eth::AssemblyItem, unsigned>> m_returnTags;
unsigned m_modifierDepth = 0;
FunctionDefinition const* m_currentFunction = nullptr;
// arguments for base constructors, filled in derived-to-base order
std::map<FunctionDefinition const*, ASTNode const*> const* m_baseArguments;
/// Stores the variables that were declared inside a specific scope, for each modifier depth.
std::map<unsigned, std::map<ASTNode const*, unsigned>> m_scopeStackHeight;
};
}
}
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