solidity/libyul/optimiser/Metrics.cpp

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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/>.
*/
/**
* Module providing metrics for the optimizer.
*/
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#include <libyul/optimiser/Metrics.h>
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#include <libyul/AST.h>
#include <libyul/Exceptions.h>
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#include <libyul/Utilities.h>
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#include <libyul/backends/evm/EVMDialect.h>
#include <libevmasm/Instruction.h>
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#include <libevmasm/GasMeter.h>
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#include <libsolutil/Visitor.h>
#include <libsolutil/CommonData.h>
using namespace std;
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using namespace solidity;
using namespace solidity::yul;
using namespace solidity::util;
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size_t CodeWeights::costOf(Statement const& _statement) const
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{
if (holds_alternative<ExpressionStatement>(_statement))
return expressionStatementCost;
else if (holds_alternative<Assignment>(_statement))
return assignmentCost;
else if (holds_alternative<VariableDeclaration>(_statement))
return variableDeclarationCost;
else if (holds_alternative<FunctionDefinition>(_statement))
return functionDefinitionCost;
else if (holds_alternative<If>(_statement))
return ifCost;
else if (holds_alternative<Switch>(_statement))
return switchCost + caseCost * std::get<Switch>(_statement).cases.size();
else if (holds_alternative<ForLoop>(_statement))
return forLoopCost;
else if (holds_alternative<Break>(_statement))
return breakCost;
else if (holds_alternative<Continue>(_statement))
return continueCost;
else if (holds_alternative<Leave>(_statement))
return leaveCost;
else if (holds_alternative<Block>(_statement))
return blockCost;
else
yulAssert(false, "If you add a new statement type, you must update CodeWeights.");
}
size_t CodeWeights::costOf(Expression const& _expression) const
{
if (holds_alternative<FunctionCall>(_expression))
return functionCallCost;
else if (holds_alternative<Identifier>(_expression))
return identifierCost;
else if (holds_alternative<Literal>(_expression))
return literalCost;
else
yulAssert(false, "If you add a new expression type, you must update CodeWeights.");
}
size_t CodeSize::codeSize(Statement const& _statement, CodeWeights const& _weights)
{
CodeSize cs(true, _weights);
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cs.visit(_statement);
return cs.m_size;
}
size_t CodeSize::codeSize(Expression const& _expression, CodeWeights const& _weights)
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{
CodeSize cs(true, _weights);
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cs.visit(_expression);
return cs.m_size;
}
size_t CodeSize::codeSize(Block const& _block, CodeWeights const& _weights)
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{
CodeSize cs(true, _weights);
cs(_block);
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return cs.m_size;
}
size_t CodeSize::codeSizeIncludingFunctions(Block const& _block, CodeWeights const& _weights)
{
CodeSize cs(false, _weights);
cs(_block);
return cs.m_size;
}
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void CodeSize::visit(Statement const& _statement)
{
if (holds_alternative<FunctionDefinition>(_statement) && m_ignoreFunctions)
return;
m_size += m_weights.costOf(_statement);
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ASTWalker::visit(_statement);
}
void CodeSize::visit(Expression const& _expression)
{
m_size += m_weights.costOf(_expression);
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ASTWalker::visit(_expression);
}
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size_t CodeCost::codeCost(Dialect const& _dialect, Expression const& _expr)
{
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CodeCost cc(_dialect);
cc.visit(_expr);
return cc.m_cost;
}
void CodeCost::operator()(FunctionCall const& _funCall)
{
ASTWalker::operator()(_funCall);
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if (EVMDialect const* dialect = dynamic_cast<EVMDialect const*>(&m_dialect))
if (BuiltinFunctionForEVM const* f = dialect->builtin(_funCall.functionName.name))
if (f->instruction)
{
addInstructionCost(*f->instruction);
return;
}
m_cost += 49;
}
void CodeCost::operator()(Literal const& _literal)
{
yulAssert(m_cost >= 1, "Should assign cost one in visit(Expression).");
size_t cost = 0;
switch (_literal.kind)
{
case LiteralKind::Boolean:
break;
case LiteralKind::Number:
for (u256 n = u256(_literal.value.str()); n >= 0x100; n >>= 8)
cost++;
break;
case LiteralKind::String:
cost = _literal.value.str().size();
break;
}
m_cost += cost;
}
void CodeCost::visit(Statement const& _statement)
{
++m_cost;
ASTWalker::visit(_statement);
}
void CodeCost::visit(Expression const& _expression)
{
++m_cost;
ASTWalker::visit(_expression);
}
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void CodeCost::addInstructionCost(evmasm::Instruction _instruction)
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{
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evmasm::Tier gasPriceTier = evmasm::instructionInfo(_instruction).gasPriceTier;
if (gasPriceTier < evmasm::Tier::VeryLow)
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m_cost -= 1;
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else if (gasPriceTier < evmasm::Tier::High)
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m_cost += 1;
else
m_cost += 49;
}
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void AssignmentCounter::operator()(Assignment const& _assignment)
{
for (auto const& variable: _assignment.variableNames)
++m_assignmentCounters[variable.name];
}
size_t AssignmentCounter::assignmentCount(YulString _name) const
{
auto it = m_assignmentCounters.find(_name);
return (it == m_assignmentCounters.end()) ? 0 : it->second;
}