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Merge pull request #3863 from ethereum/fixGasEstimation

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Correctly ignore costs of fallback for other functions.
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chriseth 2018-04-11 21:53:41 +02:00 committed by GitHub
commit ae3fca6db2
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3 changed files with 22 additions and 1 deletions
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1
Changelog.md
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@ -29,6 +29,7 @@ Bugfixes:
* Commandline interface: Fix error messages for imported files that do not exist.
* Commandline interface: Support ``--evm-version constantinople`` properly.
* DocString Parser: Fix error message for empty descriptions.
* Gas Estimator: Correctly ignore costs of fallback function for other functions.
* Standard JSON: Support ``constantinople`` as ``evmVersion`` properly.
* Type Checker: Fix detection of recursive structs.
* Type Checker: Fix asymmetry bug when comparing with literal numbers.

9
libsolidity/interface/GasEstimator.cpp
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@ -136,12 +136,19 @@ GasEstimator::GasConsumption GasEstimator::functionalEstimation(
ExpressionClasses& classes = state->expressionClasses();
using Id = ExpressionClasses::Id;
using Ids = vector<Id>;
// div(calldataload(0), 1 << 224) equals to hashValue
Id hashValue = classes.find(u256(FixedHash<4>::Arith(FixedHash<4>(dev::keccak256(_signature)))));
Id calldata = classes.find(Instruction::CALLDATALOAD, Ids{classes.find(u256(0))});
classes.forceEqual(hashValue, Instruction::DIV, Ids{
calldata,
classes.find(u256(1) << (8 * 28))
classes.find(u256(1) << 224)
});
// lt(calldatasize(), 4) equals to 0 (ignore the shortcut for fallback functions)
classes.forceEqual(
classes.find(u256(0)),
Instruction::LT,
Ids{classes.find(Instruction::CALLDATASIZE), classes.find(u256(4))}
);
}
PathGasMeter meter(_items, m_evmVersion);

13
test/libsolidity/GasMeter.cpp
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@ -294,6 +294,19 @@ BOOST_AUTO_TEST_CASE(extcodesize_gas)
testRunTimeGas("f()", vector<bytes>{encodeArgs()});
}
BOOST_AUTO_TEST_CASE(regular_functions_exclude_fallback)
{
// A bug in the estimator caused the costs for a specific function
// to always include the costs for the fallback.
char const* sourceCode = R"(
contract A {
uint public x;
function() { x = 2; }
}
)";
testCreationTimeGas(sourceCode);
testRunTimeGas("x()", vector<bytes>{encodeArgs()});
}
BOOST_AUTO_TEST_SUITE_END()
}