remix vm cancun abi.decode revert

[alexanderhawl]

I deploy the contract in remix vm cancun

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.25;

contract private_swap_test {
    mapping(address => uint256) private balance;
    uint256 public bestBet;
    address payable public winner;
    address payable private owner = payable(msg.sender);
    address public token = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2; //USDT

    function Bet() public payable {
        if (msg.value > bestBet) {
            bestBet = msg.value;
            winner = payable(msg.sender);
        }
        balance[msg.sender] += msg.value;
    }

    function withdrawToken() external payable {
        (bool success, bytes memory res) = token.call{value: 0}(abi.encodeWithSignature("balanceOf(address)", address(this)));
        uint256 tokenBalance = abi.decode(res, (uint256));
        // require(success);
        //uint tokenBalance=address(this).balance;
        if (msg.sender == winner && tokenBalance > 0) {
            (success, ) = token.call(abi.encodeWithSignature("transfer(address,uint256)", msg.sender, tokenBalance));
            require(success);
            winner = payable(0x0000000000000000000000000000000000000000); 
        }
        balance[msg.sender] = 0;
        (success, ) = address(msg.sender).call{value: balance[msg.sender]}("");
        require(success);
        
    }

    receive() external payable {
        Bet();
    }
}

when I call the withdrawToken function, it revert, the debug information says the error is in the abi.decode. So I comment it, and use

uint tokenBalance=address(this).balance;

It works well. I report this issue to solidity team, they say the compilation doesn't report error, the deploying environment is not fact cncun.
https://github.com/ethereum/solidity/issues/15099

[alexanderhawl]

deploy environment: remix vm cancun
solidity version : 0.8.25
optimization: no

[Aniket-Engg]

Hello @alexanderhawl , do you see any errors in browser console too?

[alexanderhawl]

just only revert. But I replay it in blocksec phalcon exploer, it says invalid opcode MCOPY.

[Aniket-Engg]

just only revert. But I replay it in blocksec phalcon exploer, it says invalid opcode MCOPY.

Can you share error screenshot?

This might not be related to cancun VM as if I compile using Shanghai EVM version and deploy to Remix VM(Shanghai) method call still fails

[Aniket-Engg]

Also, address(this).balance returns the ETH balance of contract not the token balance

[alexanderhawl]

I tried the code in foundry, the evm_version is shanghai, it also reverts.

[alexanderhawl]

I used blocksec phalcon to fork a eth mainnet, transaction always went well no matter the compiler is cancun or shanghai. But if I selected remix vm cancun or shanghai, it reverted.
the revert picture in remix vm
the successful transaction in phalcon fork
https://app.blocksec.com/explorer/tx/eth/0xe3dd3123b5960961e8fd9c7acf84325afc08703662594e2c3335ad016fcac7cf?event=fork&forkId=fork_57869ed1534f4c6c926a5924ebbae1cd

[alexanderhawl]

[Aniket-Engg]

Difficult to deduce what's wrong

[alexanderhawl]

I found the error reason, in the remix vm , the token address is not a contract, so the balanceOf function is error. the res variable is 0x. So the abi.decode revert. Thanks your response.

[Aniket-Engg]

okay. That's great. Hope you can fix it now. Closing this.