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Path gas meter.

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This commit is contained in:
chriseth 2015-05-22 09:33:57 +02:00
parent ba2b77bb9a
commit ec76302b85
1 changed files with 64 additions and 6 deletions
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70
libsolidity/GasMeter.cpp
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@ -23,6 +23,7 @@
#include <test/libsolidity/solidityExecutionFramework.h> #include <test/libsolidity/solidityExecutionFramework.h>
#include <libevmasm/GasMeter.h> #include <libevmasm/GasMeter.h>
#include <libevmasm/KnownState.h> #include <libevmasm/KnownState.h>
#include <libevmasm/PathGasMeter.h>
#include <libsolidity/AST.h> #include <libsolidity/AST.h>
#include <libsolidity/StructuralGasEstimator.h> #include <libsolidity/StructuralGasEstimator.h>
#include <libsolidity/SourceReferenceFormatter.h> #include <libsolidity/SourceReferenceFormatter.h>
@ -57,20 +58,38 @@ public:
); );
} }
void testCreationTimeGas(string const& _sourceCode, string const& _contractName = "") void testCreationTimeGas(string const& _sourceCode)
{ {
compileAndRun(_sourceCode); compileAndRun(_sourceCode);
auto state = make_shared<KnownState>(); auto state = make_shared<KnownState>();
GasMeter meter(state); PathGasMeter meter(*m_compiler.getAssemblyItems());
GasMeter::GasConsumption gas; GasMeter::GasConsumption gas = meter.estimateMax(0, state);
for (AssemblyItem const& item: *m_compiler.getAssemblyItems(_contractName)) u256 bytecodeSize(m_compiler.getRuntimeBytecode().size());
gas += meter.estimateMax(item);
u256 bytecodeSize(m_compiler.getRuntimeBytecode(_contractName).size());
gas += bytecodeSize * c_createDataGas; gas += bytecodeSize * c_createDataGas;
BOOST_REQUIRE(!gas.isInfinite); BOOST_REQUIRE(!gas.isInfinite);
BOOST_CHECK(gas.value == m_gasUsed); BOOST_CHECK(gas.value == m_gasUsed);
} }
void testRunTimeGas(std::string const& _sig, vector<bytes> _argumentVariants)
{
u256 gasUsed = 0;
FixedHash<4> hash(dev::sha3(_sig));
for (bytes const& arguments: _argumentVariants)
{
sendMessage(hash.asBytes() + arguments, false, 0);
gasUsed = max(gasUsed, m_gasUsed);
}
auto state = make_shared<KnownState>();
//TODO modify state to include function hash in calldata
PathGasMeter meter(*m_compiler.getRuntimeAssemblyItems());
GasMeter::GasConsumption gas = meter.estimateMax(0, state);
cout << "VM: " << gasUsed << endl;
cout << "est: " << gas << endl;
BOOST_REQUIRE(!gas.isInfinite);
BOOST_CHECK(gas.value == m_gasUsed);
}
protected: protected:
map<ASTNode const*, eth::GasMeter::GasConsumption> m_gasCosts; map<ASTNode const*, eth::GasMeter::GasConsumption> m_gasCosts;
}; };
@ -149,6 +168,45 @@ BOOST_AUTO_TEST_CASE(updating_store)
testCreationTimeGas(sourceCode); testCreationTimeGas(sourceCode);
} }
BOOST_AUTO_TEST_CASE(branches)
{
char const* sourceCode = R"(
contract test {
uint data;
uint data2;
function f(uint x) {
if (x > 7)
data2 = 1;
else
data = 1;
}
}
)";
testCreationTimeGas(sourceCode);
testRunTimeGas("f(uint256)", vector<bytes>{encodeArgs(2), encodeArgs(8)});
}
BOOST_AUTO_TEST_CASE(function_calls)
{
char const* sourceCode = R"(
contract test {
uint data;
uint data2;
function f(uint x) {
if (x > 7)
data2 = g(x**8) + 1;
else
data = 1;
}
function g(uint x) internal returns (uint) {
return data2;
}
}
)";
testCreationTimeGas(sourceCode);
testRunTimeGas("f(uint256)", vector<bytes>{encodeArgs(2), encodeArgs(8)});
}
BOOST_AUTO_TEST_SUITE_END() BOOST_AUTO_TEST_SUITE_END()
} }