solidity/libyul/CompilabilityChecker.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/>.
*/
/**
* Component that checks whether all variables are reachable on the stack.
*/
#include <libyul/CompilabilityChecker.h>
#include <libyul/AsmAnalysis.h>
#include <libyul/AsmAnalysisInfo.h>
#include <libyul/backends/evm/EVMCodeTransform.h>
#include <libyul/backends/evm/NoOutputAssembly.h>
#include <liblangutil/EVMVersion.h>
using namespace std;
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using namespace solidity;
using namespace solidity::yul;
using namespace solidity::util;
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CompilabilityChecker::CompilabilityChecker(
Dialect const& _dialect,
Object const& _object,
bool _optimizeStackAllocation
)
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{
if (auto const* evmDialect = dynamic_cast<EVMDialect const*>(&_dialect))
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{
NoOutputEVMDialect noOutputDialect(*evmDialect);
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yul::AsmAnalysisInfo analysisInfo =
yul::AsmAnalyzer::analyzeStrictAssertCorrect(noOutputDialect, _object);
BuiltinContext builtinContext;
builtinContext.currentObject = &_object;
if (!_object.name.empty())
builtinContext.subIDs[_object.name] = 1;
for (auto const& subNode: _object.subObjects)
builtinContext.subIDs[subNode->name] = 1;
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NoOutputAssembly assembly;
CodeTransform transform(
assembly,
analysisInfo,
*_object.code,
noOutputDialect,
builtinContext,
_optimizeStackAllocation
);
transform(*_object.code);
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for (StackTooDeepError const& error: transform.stackErrors())
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{
unreachableVariables[error.functionName].emplace(error.variable);
int& deficit = stackDeficit[error.functionName];
deficit = std::max(error.depth, deficit);
}
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}
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}