mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
127 lines
3.6 KiB
C++
127 lines
3.6 KiB
C++
/*(
|
|
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/>.
|
|
*/
|
|
/**
|
|
* Specific AST walkers that collect semantical facts.
|
|
*/
|
|
|
|
#include <libyul/optimiser/Semantics.h>
|
|
|
|
#include <libyul/Exceptions.h>
|
|
#include <libyul/AsmData.h>
|
|
#include <libyul/Dialect.h>
|
|
#include <libyul/backends/evm/EVMDialect.h>
|
|
|
|
#include <libevmasm/SemanticInformation.h>
|
|
|
|
#include <libdevcore/CommonData.h>
|
|
|
|
using namespace std;
|
|
using namespace dev;
|
|
using namespace yul;
|
|
|
|
MovableChecker::MovableChecker(Dialect const& _dialect):
|
|
m_dialect(_dialect)
|
|
{
|
|
}
|
|
|
|
MovableChecker::MovableChecker(Dialect const& _dialect, Expression const& _expression):
|
|
MovableChecker(_dialect)
|
|
{
|
|
visit(_expression);
|
|
}
|
|
|
|
void MovableChecker::operator()(Identifier const& _identifier)
|
|
{
|
|
ASTWalker::operator()(_identifier);
|
|
m_variableReferences.emplace(_identifier.name);
|
|
}
|
|
|
|
void MovableChecker::operator()(FunctionalInstruction const& _instr)
|
|
{
|
|
ASTWalker::operator()(_instr);
|
|
|
|
if (!eth::SemanticInformation::movable(_instr.instruction))
|
|
m_movable = false;
|
|
if (!eth::SemanticInformation::sideEffectFree(_instr.instruction))
|
|
m_sideEffectFree = false;
|
|
}
|
|
|
|
void MovableChecker::operator()(FunctionCall const& _functionCall)
|
|
{
|
|
ASTWalker::operator()(_functionCall);
|
|
|
|
if (BuiltinFunction const* f = m_dialect.builtin(_functionCall.functionName.name))
|
|
{
|
|
if (!f->movable)
|
|
m_movable = false;
|
|
if (!f->sideEffectFree)
|
|
m_sideEffectFree = false;
|
|
}
|
|
else
|
|
{
|
|
m_movable = false;
|
|
m_sideEffectFree = false;
|
|
}
|
|
}
|
|
|
|
void MovableChecker::visit(Statement const&)
|
|
{
|
|
assertThrow(false, OptimizerException, "Movability for statement requested.");
|
|
}
|
|
|
|
pair<TerminationFinder::ControlFlow, size_t> TerminationFinder::firstUnconditionalControlFlowChange(
|
|
vector<Statement> const& _statements
|
|
)
|
|
{
|
|
for (size_t i = 0; i < _statements.size(); ++i)
|
|
{
|
|
ControlFlow controlFlow = controlFlowKind(_statements[i]);
|
|
if (controlFlow != ControlFlow::FlowOut)
|
|
return {controlFlow, i};
|
|
}
|
|
return {ControlFlow::FlowOut, size_t(-1)};
|
|
}
|
|
|
|
TerminationFinder::ControlFlow TerminationFinder::controlFlowKind(Statement const& _statement)
|
|
{
|
|
if (
|
|
_statement.type() == typeid(ExpressionStatement) &&
|
|
isTerminatingBuiltin(boost::get<ExpressionStatement>(_statement))
|
|
)
|
|
return ControlFlow::Terminate;
|
|
else if (_statement.type() == typeid(Break))
|
|
return ControlFlow::Break;
|
|
else if (_statement.type() == typeid(Continue))
|
|
return ControlFlow::Continue;
|
|
else
|
|
return ControlFlow::FlowOut;
|
|
}
|
|
|
|
bool TerminationFinder::isTerminatingBuiltin(ExpressionStatement const& _exprStmnt)
|
|
{
|
|
if (_exprStmnt.expression.type() == typeid(FunctionalInstruction))
|
|
return eth::SemanticInformation::terminatesControlFlow(
|
|
boost::get<FunctionalInstruction>(_exprStmnt.expression).instruction
|
|
);
|
|
else if (_exprStmnt.expression.type() == typeid(FunctionCall))
|
|
if (auto const* dialect = dynamic_cast<EVMDialect const*>(&m_dialect))
|
|
if (auto const* builtin = dialect->builtin(boost::get<FunctionCall>(_exprStmnt.expression).functionName.name))
|
|
if (builtin->instruction)
|
|
return eth::SemanticInformation::terminatesControlFlow(*builtin->instruction);
|
|
return false;
|
|
}
|