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Merge pull request #10043 from ethereum/emptyArrayCopy

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Fix empty array copy bug.
This commit is contained in:
chriseth
2020-10-15 17:07:54 +02:00
committed by GitHub
parent e17d6853a9 38abadf502
commit 89bdad2096
5 changed files with 130 additions and 1 deletions
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test/libsolidity/semanticTests/array/copying/empty_bytes_copy.sol
+28
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@@ -0,0 +1,28 @@
contract C {
bytes data;
bytes otherData;
function fromMemory() public returns (byte) {
bytes memory t;
uint[2] memory x;
x[0] = type(uint).max;
data = t;
data.push();
return data[0];
}
function fromCalldata(bytes calldata x) public returns (byte) {
data = x;
data.push();
return data[0];
}
function fromStorage() public returns (byte) {
// zero-length but dirty higher order bits
assembly { sstore(otherData.slot, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00) }
data = otherData;
data.push();
return data[0];
}
}
// ----
// fromMemory() -> 0x00
// fromCalldata(bytes): 0x40, 0x60, 0x00, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff -> 0x00
// fromStorage() -> 0x00