Error when instrumenting an "if" in an assembly block #287
Description
We're getting an error when trying to instrument one of our contracts that has some assembly:
There was a problem instrumenting ./coverageEnv/contracts/MyContract.sol: SyntaxError: Expected "=:", "for", "function", "hex", "let", "return", "switch", "{", "}", comment, end of line, number, string, or whitespace but "i" found. Line: 29, Column: 7
It fails in the if statement at the bottom.
Any idea why?
/// @notice Checks if a given address is whitelisted
/// @return true if address is whitelisted, false if not
function isWhitelisted
(
address _address
)
public
view
returns (bool _isWhitelisted)
{
bytes4 _signature = bytes4(keccak256("whitelisted(address)"));
address _whitelistContract = getContractAddress("Whitelist");
assembly {
let _pointer := mload(0x40) // Set _pointer to free memory pointer
mstore(_pointer, _signature) // Store _signature at _pointer
mstore(add(_pointer, 0x04), _address) // Store _address at _pointer. Offset by 4 bytes for previously stored _signature
// staticcall(g, a, in, insize, out, outsize) => returns 0 on error, 1 on success
let result := staticcall(
gas, // g = gas: whatever was passed already
_whitelistContract, // a = address: _whitelist address assigned from getContractAddress()
_pointer, // in = mem in mem[in..(in+insize): set to _pointer pointer
0x24, // insize = mem insize mem[in..(in+insize): size of signature (bytes4) + bytes32 = 0x24
_pointer, // out = mem out mem[out..(out+outsize): output assigned to this storage address
0x20 // outsize = mem outsize mem[out..(out+outsize): output should be 32byte slot (bool size = 0x01 < slot size 0x20)
)
// Revert if not successful
if iszero(result) {
revert(0, 0)
}
_isWhitelisted := mload(_pointer) // Assign result to returned value
mstore(0x40, add(_pointer, 0x24)) // Advance free memory pointer by largest _pointer size
}
}