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Merge pull request #1104 from ethereum/fixmemcosts

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Fix memory resize costs during call
This commit is contained in:
chriseth
2016-09-17 12:30:41 +02:00
committed by GitHub
parent 60f432e869 a4f6e5b16c
commit 212e016091
3 changed files with 42 additions and 4 deletions
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test/libsolidity/SolidityEndToEndTest.cpp
+27
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@@ -7203,6 +7203,33 @@ BOOST_AUTO_TEST_CASE(no_nonpayable_circumvention_by_modifier)
BOOST_CHECK_EQUAL(balanceAt(m_contractAddress), 0);
}
BOOST_AUTO_TEST_CASE(mem_resize_is_not_paid_at_call)
{
// This tests that memory resize for return values is not paid during the call, which would
// make the gas calculation overly complex. We access the end of the output area before
// the call is made.
// Tests that this also survives the optimizer.
char const* sourceCode = R"(
contract C {
function f() returns (uint[200]) {}
}
contract D {
function f(C c) returns (uint) { c.f(); return 7; }
}
)";
compileAndRun(sourceCode, 0, "C");
u160 cAddr = m_contractAddress;
compileAndRun(sourceCode, 0, "D");
BOOST_CHECK(callContractFunction("f(address)", cAddr) == encodeArgs(u256(7)));
m_optimize = true;
compileAndRun(sourceCode, 0, "C");
u160 cAddrOpt = m_contractAddress;
compileAndRun(sourceCode, 0, "D");
BOOST_CHECK(callContractFunction("f(address)", cAddrOpt) == encodeArgs(u256(7)));
}
BOOST_AUTO_TEST_SUITE_END()