blockchain - solidity - yul - 使用remix来调试assembly yul , 使用log1 来触发event

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refer to:
https://medium.com/@kulman.david/how-to-use-remix-debugger-to-learn-solidity-assembly-5a745a22bb07

1. copy代码到remix

2. compile, deploy

3. 调用

调用后，可以看到debug信息

步骤，对应的代码，消耗的gas:

具体使用：

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;


contract Yular {
    address public owner;
    bool public flag;

    modifier onlyOwner() {
        require(owner == msg.sender,"You are not owner");
        _;
    }
    constructor() {
        owner = msg.sender;
        flag = false;
    }

    event ExtCodeSizeEvent(uint256 size);
    event CallerEvent(uint256 caller);
    event shlEvent(uint256 shl);
    event ifEvent(bool r);
    event MyLogEvent(uint256 value);

    // 1. from address wallet 
    // 2. from contract 
    function func() public {
        bytes32 extCodeSizeEventHash = bytes32(keccak256("ExtCodeSizeEvent(uint256)"));
        bytes32 callerEventHash = bytes32(keccak256("CallerEvent(uint256)"));
        bytes32 shlEventhash = bytes32(keccak256("shlEvent(uint256)"));
        bytes32 ifEventhash = bytes32(keccak256("ifEvent(bool)"));
        bytes32 myLogEventhash = bytes32(keccak256("MyLogEvent(uint256)"));
        assembly {
            let size := extcodesize(caller())
            mstore(0x80, caller())
            log1(0x80, 32, callerEventHash)
            mstore(0x80, size)
            log1(0x80, 32, extCodeSizeEventHash)
            mstore(0x80, shl(0x6,2)) 
            log1(0x80, 32, shlEventhash)

            mstore(0x80, gt(size, shl(0x6,2))) 
            log1(0x80, 32, ifEventhash)
            
            mstore(0x80, 1111)
            log1(0x80, 32, myLogEventhash)
            if gt(size, shl(0x6,2)) { 
                mstore(0x80, 4001)
                log1(0x80, 32, myLogEventhash)
                // invalid() 
            } 

            mstore(0x80, 2222)
            log1(0x80, 32, myLogEventhash)
            /*
            for { let i := 0 } lt(i, 0x4) { i := add(i, 1) } {
                mstore(0x80, i)
                log1(0x80, 32, myLogEventhash)

                mstore(0, blockhash(mod(caller(),4)))
                let success := call(gas(), caller(), 0, shl(0x5, 1), 0, 0,0)
                if eq(success, 0) { 
                    mstore(0x80, 4002)
                    log1(0x80, 32, myLogEventhash)
                    // invalid() 
                }
                returndatacopy(0, 0, shl(0x5, 1))
                switch eq(i, mload(0))
                case 0 { 
                    mstore(0x80, 4003) 
                    log1(0x80, 32, myLogEventhash)                    
                    // invalid() 
                    } 
            }
            */
        }
        owner = msg.sender;
    }

    function targetCall (address target,bytes memory data) public onlyOwner(){
        (bool success,bytes memory returnData)=target.delegatecall(data);
    }
   

    function isSolved() public view returns (bool){
        return flag;
    }

}

部署到remix上，

ctrl + s ： 编译

每次修改代码之后，ctrl + s , 然后 deploy:

看到log了，就可以调试了。

如果程序报错，该tx 就没有任何event ( 因为该tx也没有，而event log 是依附于 tx的）

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