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Test about semantics of "swap" in storage.

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This commit is contained in:
chriseth 2017-06-22 17:24:19 +02:00
parent d0b6de0b34
commit 1a3066c3a1
1 changed files with 32 additions and 0 deletions
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32
test/libsolidity/SolidityEndToEndTest.cpp
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@ -4483,6 +4483,38 @@ BOOST_AUTO_TEST_CASE(array_copy_including_mapping)
BOOST_CHECK(storageEmpty(m_contractAddress)); BOOST_CHECK(storageEmpty(m_contractAddress));
} }
BOOST_AUTO_TEST_CASE(swap_in_storage_overwrite)
{
// This tests a swap in storage which does not work as one
// might expect because we do not have temporary storage.
// (x, y) = (y, x) is the same as
// y = x;
// x = y;
char const* sourceCode = R"(
contract c {
struct S { uint a; uint b; }
S public x;
S public y;
function set() {
x.a = 1; x.b = 2;
y.a = 3; y.b = 4;
}
function swap() {
(x, y) = (y, x);
}
}
)";
compileAndRun(sourceCode);
BOOST_CHECK(callContractFunction("x()") == encodeArgs(u256(0), u256(0)));
BOOST_CHECK(callContractFunction("y()") == encodeArgs(u256(0), u256(0)));
BOOST_CHECK(callContractFunction("set()") == encodeArgs());
BOOST_CHECK(callContractFunction("x()") == encodeArgs(u256(1), u256(2)));
BOOST_CHECK(callContractFunction("y()") == encodeArgs(u256(3), u256(4)));
BOOST_CHECK(callContractFunction("swap()") == encodeArgs());
BOOST_CHECK(callContractFunction("x()") == encodeArgs(u256(1), u256(2)));
BOOST_CHECK(callContractFunction("y()") == encodeArgs(u256(1), u256(2)));
}
BOOST_AUTO_TEST_CASE(pass_dynamic_arguments_to_the_base) BOOST_AUTO_TEST_CASE(pass_dynamic_arguments_to_the_base)
{ {
char const* sourceCode = R"( char const* sourceCode = R"(