mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
326 lines
9.6 KiB
C++
326 lines
9.6 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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// SPDX-License-Identifier: GPL-3.0
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/**
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* @author Christian <c@ethdev.com>
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* @date 2015
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* Unit tests for the gas estimator.
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*/
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#include <test/libsolidity/SolidityExecutionFramework.h>
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#include <libevmasm/GasMeter.h>
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#include <libevmasm/KnownState.h>
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#include <libevmasm/PathGasMeter.h>
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#include <libsolidity/ast/AST.h>
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#include <libsolidity/interface/GasEstimator.h>
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#include <liblangutil/SourceReferenceFormatter.h>
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using namespace std;
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using namespace solidity::langutil;
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using namespace solidity::evmasm;
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using namespace solidity::frontend;
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using namespace solidity::frontend::test;
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namespace solidity::frontend::test
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{
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class GasMeterTestFramework: public SolidityExecutionFramework
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{
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public:
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void compile(string const& _sourceCode)
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{
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m_compiler.reset();
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m_compiler.setSources({{"", "pragma solidity >=0.0;\n"
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"// SPDX-License-Identifier: GPL-3.0\n" + _sourceCode}});
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m_compiler.setOptimiserSettings(solidity::test::CommonOptions::get().optimize);
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m_compiler.setEVMVersion(m_evmVersion);
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BOOST_REQUIRE_MESSAGE(m_compiler.compile(), "Compiling contract failed");
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}
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void testCreationTimeGas(string const& _sourceCode, u256 const& _tolerance = u256(0))
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{
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compileAndRun(_sourceCode);
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auto state = make_shared<KnownState>();
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PathGasMeter meter(*m_compiler.assemblyItems(m_compiler.lastContractName()), solidity::test::CommonOptions::get().evmVersion());
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GasMeter::GasConsumption gas = meter.estimateMax(0, state);
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u256 bytecodeSize(m_compiler.runtimeObject(m_compiler.lastContractName()).bytecode.size());
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// costs for deployment
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gas += bytecodeSize * GasCosts::createDataGas;
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// costs for transaction
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gas += gasForTransaction(m_compiler.object(m_compiler.lastContractName()).bytecode, true);
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// Skip the tests when we force ABIEncoderV2.
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// TODO: We should enable this again once the yul optimizer is activated.
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if (!solidity::test::CommonOptions::get().useABIEncoderV2)
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{
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BOOST_REQUIRE(!gas.isInfinite);
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BOOST_CHECK_LE(m_gasUsed, gas.value);
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BOOST_CHECK_LE(gas.value - _tolerance, m_gasUsed);
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}
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}
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/// Compares the gas computed by PathGasMeter for the given signature (but unknown arguments)
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/// against the actual gas usage computed by the VM on the given set of argument variants.
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void testRunTimeGas(string const& _sig, vector<bytes> _argumentVariants, u256 const& _tolerance = u256(0))
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{
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u256 gasUsed = 0;
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GasMeter::GasConsumption gas;
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util::FixedHash<4> hash(util::keccak256(_sig));
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for (bytes const& arguments: _argumentVariants)
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{
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sendMessage(hash.asBytes() + arguments, false, 0);
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BOOST_CHECK(m_transactionSuccessful);
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gasUsed = max(gasUsed, m_gasUsed);
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gas = max(gas, gasForTransaction(hash.asBytes() + arguments, false));
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}
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gas += GasEstimator(solidity::test::CommonOptions::get().evmVersion()).functionalEstimation(
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*m_compiler.runtimeAssemblyItems(m_compiler.lastContractName()),
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_sig
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);
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// Skip the tests when we force ABIEncoderV2.
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// TODO: We should enable this again once the yul optimizer is activated.
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if (!solidity::test::CommonOptions::get().useABIEncoderV2)
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{
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BOOST_REQUIRE(!gas.isInfinite);
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BOOST_CHECK_LE(m_gasUsed, gas.value);
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BOOST_CHECK_LE(gas.value - _tolerance, m_gasUsed);
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}
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}
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static GasMeter::GasConsumption gasForTransaction(bytes const& _data, bool _isCreation)
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{
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auto evmVersion = solidity::test::CommonOptions::get().evmVersion();
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GasMeter::GasConsumption gas = _isCreation ? GasCosts::txCreateGas : GasCosts::txGas;
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for (auto i: _data)
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gas += i != 0 ? GasCosts::txDataNonZeroGas(evmVersion) : GasCosts::txDataZeroGas;
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return gas;
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}
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};
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BOOST_FIXTURE_TEST_SUITE(GasMeterTests, GasMeterTestFramework)
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BOOST_AUTO_TEST_CASE(simple_contract)
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{
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// Tests a simple "deploy contract" code without constructor. The actual contract is not relevant.
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char const* sourceCode = R"(
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contract test {
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bytes32 public shaValue;
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function f(uint a) public {
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shaValue = keccak256(abi.encodePacked(a));
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}
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}
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)";
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testCreationTimeGas(sourceCode);
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}
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BOOST_AUTO_TEST_CASE(store_keccak256)
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{
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char const* sourceCode = R"(
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contract test {
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bytes32 public shaValue;
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constructor() {
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shaValue = keccak256(abi.encodePacked(this));
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}
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}
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)";
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testCreationTimeGas(sourceCode);
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}
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BOOST_AUTO_TEST_CASE(updating_store)
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{
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char const* sourceCode = R"(
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contract test {
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uint data;
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uint data2;
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constructor() {
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data = 1;
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data = 2;
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data2 = 0;
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}
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}
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)";
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testCreationTimeGas(sourceCode, m_evmVersion < langutil::EVMVersion::constantinople() ? u256(0) : u256(9600));
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}
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BOOST_AUTO_TEST_CASE(branches)
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{
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char const* sourceCode = R"(
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contract test {
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uint data;
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uint data2;
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function f(uint x) public {
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if (x > 7)
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data2 = 1;
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else
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data = 1;
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}
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}
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)";
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testCreationTimeGas(sourceCode);
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testRunTimeGas("f(uint256)", vector<bytes>{encodeArgs(2), encodeArgs(8)});
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}
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BOOST_AUTO_TEST_CASE(function_calls)
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{
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char const* sourceCode = R"(
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contract test {
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uint data;
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uint data2;
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function f(uint x) public {
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if (x > 7)
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data2 = g(x**8) + 1;
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else
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data = 1;
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}
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function g(uint x) internal returns (uint) {
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return data2;
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}
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}
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)";
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testCreationTimeGas(sourceCode);
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testRunTimeGas("f(uint256)", vector<bytes>{encodeArgs(2), encodeArgs(8)});
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}
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BOOST_AUTO_TEST_CASE(multiple_external_functions)
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{
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char const* sourceCode = R"(
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contract test {
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uint data;
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uint data2;
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function f(uint x) public {
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if (x > 7)
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data2 = g(x**8) + 1;
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else
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data = 1;
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}
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function g(uint x) public returns (uint) {
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return data2;
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}
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}
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)";
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testCreationTimeGas(sourceCode);
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testRunTimeGas("f(uint256)", vector<bytes>{encodeArgs(2), encodeArgs(8)});
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testRunTimeGas("g(uint256)", vector<bytes>{encodeArgs(2)});
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}
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BOOST_AUTO_TEST_CASE(exponent_size)
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{
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char const* sourceCode = R"(
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contract A {
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function f(uint x) public returns (uint) {
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return x ** 0;
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}
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function g(uint x) public returns (uint) {
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return x ** 0x100;
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}
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function h(uint x) public returns (uint) {
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return x ** 0x10000;
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}
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}
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)";
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testCreationTimeGas(sourceCode);
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testRunTimeGas("f(uint256)", vector<bytes>{encodeArgs(2)});
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testRunTimeGas("g(uint256)", vector<bytes>{encodeArgs(2)});
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testRunTimeGas("h(uint256)", vector<bytes>{encodeArgs(2)});
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}
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BOOST_AUTO_TEST_CASE(balance_gas)
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{
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char const* sourceCode = R"(
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contract A {
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function lookup_balance(address a) public returns (uint) {
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return a.balance;
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}
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}
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)";
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testCreationTimeGas(sourceCode);
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testRunTimeGas("lookup_balance(address)", vector<bytes>{encodeArgs(2), encodeArgs(100)});
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}
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BOOST_AUTO_TEST_CASE(extcodesize_gas)
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{
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char const* sourceCode = R"(
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contract A {
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function f() public returns (uint _s) {
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assembly {
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_s := extcodesize(0x30)
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}
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}
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}
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)";
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testCreationTimeGas(sourceCode);
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testRunTimeGas("f()", vector<bytes>{encodeArgs()});
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}
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BOOST_AUTO_TEST_CASE(regular_functions_exclude_fallback)
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{
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// A bug in the estimator caused the costs for a specific function
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// to always include the costs for the fallback.
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char const* sourceCode = R"(
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contract A {
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uint public x;
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fallback() external { x = 2; }
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}
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)";
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testCreationTimeGas(sourceCode);
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testRunTimeGas("x()", vector<bytes>{encodeArgs()});
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}
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BOOST_AUTO_TEST_CASE(complex_control_flow)
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{
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// This crashed the gas estimator previously (or took a very long time).
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// Now we do not follow branches if they start out with lower gas costs than the ones
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// we previously considered. This of course reduces accuracy.
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char const* sourceCode = R"(
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contract log {
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function ln(int128 x) public pure returns (int128 result) {
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int128 t = x / 256;
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int128 y = 5545177;
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x = t;
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t = x * 16; if (t <= 1000000) { x = t; y = y - 2772588; }
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t = x * 4; if (t <= 1000000) { x = t; y = y - 1386294; }
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t = x * 2; if (t <= 1000000) { x = t; y = y - 693147; }
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t = x + x / 2; if (t <= 1000000) { x = t; y = y - 405465; }
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t = x + x / 4; if (t <= 1000000) { x = t; y = y - 223144; }
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t = x + x / 8; if (t <= 1000000) { x = t; y = y - 117783; }
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t = x + x / 16; if (t <= 1000000) { x = t; y = y - 60624; }
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t = x + x / 32; if (t <= 1000000) { x = t; y = y - 30771; }
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t = x + x / 64; if (t <= 1000000) { x = t; y = y - 15504; }
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t = x + x / 128; if (t <= 1000000) { x = t; y = y - 7782; }
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t = x + x / 256; if (t <= 1000000) { x = t; y = y - 3898; }
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t = x + x / 512; if (t <= 1000000) { x = t; y = y - 1951; }
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t = x + x / 1024; if (t <= 1000000) { x = t; y = y - 976; }
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t = x + x / 2048; if (t <= 1000000) { x = t; y = y - 488; }
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t = x + x / 4096; if (t <= 1000000) { x = t; y = y - 244; }
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t = x + x / 8192; if (t <= 1000000) { x = t; y = y - 122; }
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t = x + x / 16384; if (t <= 1000000) { x = t; y = y - 61; }
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t = x + x / 32768; if (t <= 1000000) { x = t; y = y - 31; }
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t = x + x / 65536; if (t <= 1000000) { y = y - 15; }
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return y;
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}
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}
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)";
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testCreationTimeGas(sourceCode);
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// max gas is used for small x
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testRunTimeGas("ln(int128)", vector<bytes>{encodeArgs(0), encodeArgs(10), encodeArgs(105), encodeArgs(30000)});
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}
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BOOST_AUTO_TEST_SUITE_END()
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}
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