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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/>.
*/
/**
* Optimiser component that performs function inlining for arbitrary functions.
*/
#pragma once
#include <libyul/ASTDataForward.h>
#include <libyul/optimiser/ASTCopier.h>
#include <libyul/optimiser/ASTWalker.h>
#include <libyul/optimiser/NameDispenser.h>
#include <libyul/Exceptions.h>
#include <liblangutil/SourceLocation.h>
#include <boost/variant.hpp>
#include <boost/optional.hpp>
#include <set>
namespace dev
{
namespace yul
{
class NameCollector;
/**
* Optimiser component that modifies an AST in place, inlining functions.
* Expressions are expected to be split, i.e. the component will only inline
* function calls that are at the root of the expression and that only contains
* variables as arguments. More specifically, it will inline
* - let x1, ..., xn := f(a1, ..., am)
* - x1, ..., xn := f(a1, ..., am)
* f(a1, ..., am)
*
* The transform changes code of the form
*
* function f(a, b) -> c { ... }
* let z := f(x, y)
*
* into
*
* function f(a, b) -> c { ... }
*
* let f_a := x
* let f_b := y
* let f_c
* code of f, with replacements: a -> f_a, b -> f_b, c -> f_c
* let z := f_c
*
* Prerequisites: Disambiguator, Function Hoister
* More efficient if run after: Expression Splitter
*/
class FullInliner: public ASTModifier
{
public:
explicit FullInliner(Block& _ast, NameDispenser& _dispenser);
void run();
/// Inlining heuristic.
/// @param _callSite the name of the function in which the function call is located.
bool shallInline(FunctionCall const& _funCall, YulString _callSite);
FunctionDefinition& function(YulString _name) { return *m_functions.at(_name); }
private:
void updateCodeSize(FunctionDefinition& fun);
void handleBlock(YulString _currentFunctionName, Block& _block);
/// The AST to be modified. The root block itself will not be modified, because
/// we store pointers to functions.
Block& m_ast;
std::map<YulString, FunctionDefinition*> m_functions;
/// Names of functions to always inline.
std::set<YulString> m_alwaysInline;
/// Variables that are constants (used for inlining heuristic)
std::set<YulString> m_constants;
std::map<YulString, size_t> m_functionSizes;
NameDispenser& m_nameDispenser;
};
/**
* Class that walks the AST of a block that does not contain function definitions and perform
* the actual code modifications.
*/
class InlineModifier: public ASTModifier
{
public:
InlineModifier(FullInliner& _driver, NameDispenser& _nameDispenser, YulString _functionName):
m_currentFunction(std::move(_functionName)),
m_driver(_driver),
m_nameDispenser(_nameDispenser)
{ }
void operator()(Block& _block) override;
private:
boost::optional<std::vector<Statement>> tryInlineStatement(Statement& _statement);
std::vector<Statement> performInline(Statement& _statement, FunctionCall& _funCall);
YulString m_currentFunction;
FullInliner& m_driver;
NameDispenser& m_nameDispenser;
};
/**
* Creates a copy of a block that is supposed to be the body of a function.
* Applies replacements to referenced variables and creates new names for
* variable declarations.
*/
class BodyCopier: public ASTCopier
{
public:
BodyCopier(
NameDispenser& _nameDispenser,
YulString _varNamePrefix,
std::map<YulString, YulString> const& _variableReplacements
):
m_nameDispenser(_nameDispenser),
m_varNamePrefix(_varNamePrefix),
m_variableReplacements(_variableReplacements)
{}
using ASTCopier::operator ();
Statement operator()(VariableDeclaration const& _varDecl) override;
Statement operator()(FunctionDefinition const& _funDef) override;
YulString translateIdentifier(YulString _name) override;
NameDispenser& m_nameDispenser;
YulString m_varNamePrefix;
std::map<YulString, YulString> m_variableReplacements;
};
}
}
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