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Merge pull request #4277 from ethereum/signedRightShift

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Signed Right Shift: Additional test and more explanation.
This commit is contained in:
Daniel Kirchner
2018-06-12 17:19:20 +02:00
committed by GitHub
parent 2c8eca5dcf 510f227bd7
commit e2f4a9fcf4
2 changed files with 40 additions and 2 deletions
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test/libsolidity/SolidityEndToEndTest.cpp
+33
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@@ -10508,6 +10508,39 @@ BOOST_AUTO_TEST_CASE(shift_right_garbled)
ABI_CHECK(callContractFunction("f(uint8,uint8)", u256(0x0), u256(0x1004)), encodeArgs(u256(0xf)));
}
BOOST_AUTO_TEST_CASE(shift_right_garbled_signed)
{
char const* sourceCode = R"(
contract C {
function f(int8 a, uint8 b) returns (int) {
assembly {
a := 0xfffffff0
}
// Higher bits should be signextended before the shift
return a >> b;
}
function g(int8 a, uint8 b) returns (int) {
assembly {
a := 0xf0
}
// Higher bits should be signextended before the shift
return a >> b;
}
}
)";
compileAndRun(sourceCode, 0, "C");
ABI_CHECK(callContractFunction("f(int8,uint8)", u256(0x0), u256(3)), encodeArgs(u256(-2)));
ABI_CHECK(callContractFunction("f(int8,uint8)", u256(0x0), u256(4)), encodeArgs(u256(-1)));
ABI_CHECK(callContractFunction("f(int8,uint8)", u256(0x0), u256(0xFF)), encodeArgs(u256(-1)));
ABI_CHECK(callContractFunction("f(int8,uint8)", u256(0x0), u256(0x1003)), encodeArgs(u256(-2)));
ABI_CHECK(callContractFunction("f(int8,uint8)", u256(0x0), u256(0x1004)), encodeArgs(u256(-1)));
ABI_CHECK(callContractFunction("g(int8,uint8)", u256(0x0), u256(3)), encodeArgs(u256(-2)));
ABI_CHECK(callContractFunction("g(int8,uint8)", u256(0x0), u256(4)), encodeArgs(u256(-1)));
ABI_CHECK(callContractFunction("g(int8,uint8)", u256(0x0), u256(0xFF)), encodeArgs(u256(-1)));
ABI_CHECK(callContractFunction("g(int8,uint8)", u256(0x0), u256(0x1003)), encodeArgs(u256(-2)));
ABI_CHECK(callContractFunction("g(int8,uint8)", u256(0x0), u256(0x1004)), encodeArgs(u256(-1)));
}
BOOST_AUTO_TEST_CASE(shift_right_uint32)
{
char const* sourceCode = R"(