cerc-io/solidity
10
0
Fork 0
mirror of https://github.com/ethereum/solidity synced 2023-10-03 13:03:40 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Functional gas estimator.

Browse Source
This commit is contained in:
chriseth 2015-05-22 10:48:54 +02:00
parent ec76302b85
commit 964bcd6b85
1 changed files with 31 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
libsolidity/GasMeter.cpp
View File

@ -25,7 +25,7 @@
#include <libevmasm/KnownState.h> #include <libevmasm/KnownState.h>
#include <libevmasm/PathGasMeter.h> #include <libevmasm/PathGasMeter.h>
#include <libsolidity/AST.h> #include <libsolidity/AST.h>
#include <libsolidity/StructuralGasEstimator.h> #include <libsolidity/GasEstimator.h>
#include <libsolidity/SourceReferenceFormatter.h> #include <libsolidity/SourceReferenceFormatter.h>
using namespace std; using namespace std;
@ -48,12 +48,11 @@ public:
m_compiler.setSource(_sourceCode); m_compiler.setSource(_sourceCode);
ETH_TEST_REQUIRE_NO_THROW(m_compiler.compile(), "Compiling contract failed"); ETH_TEST_REQUIRE_NO_THROW(m_compiler.compile(), "Compiling contract failed");
StructuralGasEstimator estimator;
AssemblyItems const* items = m_compiler.getRuntimeAssemblyItems(""); AssemblyItems const* items = m_compiler.getRuntimeAssemblyItems("");
ASTNode const& sourceUnit = m_compiler.getAST(); ASTNode const& sourceUnit = m_compiler.getAST();
BOOST_REQUIRE(items != nullptr); BOOST_REQUIRE(items != nullptr);
m_gasCosts = estimator.breakToStatementLevel( m_gasCosts = GasEstimator::breakToStatementLevel(
estimator.performEstimation(*items, vector<ASTNode const*>({&sourceUnit})), GasEstimator::structuralEstimation(*items, vector<ASTNode const*>({&sourceUnit})),
{&sourceUnit} {&sourceUnit}
); );
} }
@ -70,6 +69,8 @@ public:
BOOST_CHECK(gas.value == m_gasUsed); BOOST_CHECK(gas.value == m_gasUsed);
} }
/// Compares the gas computed by PathGasMeter for the given signature (but unknown arguments)
/// against the actual gas usage computed by the VM on the given set of argument variants.
void testRunTimeGas(std::string const& _sig, vector<bytes> _argumentVariants) void testRunTimeGas(std::string const& _sig, vector<bytes> _argumentVariants)
{ {
u256 gasUsed = 0; u256 gasUsed = 0;
@ -80,12 +81,10 @@ public:
gasUsed = max(gasUsed, m_gasUsed); gasUsed = max(gasUsed, m_gasUsed);
} }
auto state = make_shared<KnownState>(); GasMeter::GasConsumption gas = GasEstimator::functionalEstimation(
//TODO modify state to include function hash in calldata *m_compiler.getRuntimeAssemblyItems(),
PathGasMeter meter(*m_compiler.getRuntimeAssemblyItems()); _sig
GasMeter::GasConsumption gas = meter.estimateMax(0, state); );
cout << "VM: " << gasUsed << endl;
cout << "est: " << gas << endl;
BOOST_REQUIRE(!gas.isInfinite); BOOST_REQUIRE(!gas.isInfinite);
BOOST_CHECK(gas.value == m_gasUsed); BOOST_CHECK(gas.value == m_gasUsed);
} }
@ -207,6 +206,28 @@ BOOST_AUTO_TEST_CASE(function_calls)
testRunTimeGas("f(uint256)", vector<bytes>{encodeArgs(2), encodeArgs(8)}); testRunTimeGas("f(uint256)", vector<bytes>{encodeArgs(2), encodeArgs(8)});
} }
BOOST_AUTO_TEST_CASE(multiple_external_functions)
{
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) returns (uint) {
return data2;
}
}
)";
testCreationTimeGas(sourceCode);
testRunTimeGas("f(uint256)", vector<bytes>{encodeArgs(2), encodeArgs(8)});
testRunTimeGas("g(uint256)", vector<bytes>{encodeArgs(2)});
}
BOOST_AUTO_TEST_SUITE_END() BOOST_AUTO_TEST_SUITE_END()
} }