佛萨奇DAPP开发丨佛萨奇2.0系统开发详情丨佛萨奇2.0智能合约系统开发原理及源码

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

//被创建合约
contract Creature {
    uint public x;
    constructor(uint a) payable {
        x = a;
    }

    function get() public view returns(uint){
        return x;
    }
}

//创建者合约
contract Creator {
    function bytesCopy(bytes memory src, bytes memory dst, uint begin) internal pure returns (bytes memory){
        uint len = src.length < 31 ? src.length : 31;
        for(uint i = 0; i < len; i++){
            dst[begin + i] = src[i];
        }
        return dst;
    }

    function createSalted(uint arg, string calldata name) public {
	    bytes memory bytesname = bytes(name);
        bytes memory custom = new bytes(32);

        uint8 rtTypeEvm = 5;                      //evm的虚拟机类型是5，所以该值必须是5
        custom[0] = bytes1(rtTypeEvm);            //虚拟机类型必须放入custom的首字节，custom将赋值给创建选项salt
        custom = bytesCopy(bytesname, custom, 1); //将合约名拷贝到后31字节内

        bytes32 n;
	      assembly{
	        n := mload(add(custom, 32))
	      }

				//花括号内的salt为创建选项，salt为solidity语法关键字，赋值类型为byte32数据的值
				//如果不指定为salt选项，写法为： Creature d = new Creature(arg)
        Creature d = new Creature{salt: n}(arg);
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.0;

contract Factory {

    function bytesCopy(bytes memory src, bytes memory dst, uint begin) internal pure returns (bytes memory){
        uint len = src.length < 31 ? src.length : 31;
        for(uint i = 0; i < len; i++){
            dst[begin + i] = src[i];
        }
        return dst;
    }

    function create(uint8 rtType, string calldata name, bytes calldata code) public returns (address addr){
        assert(0 < rtType && rtType < 8);//ChainMaker支持7种虚拟机

	      bytes memory bytesname = bytes(name);
	      bytes memory bytesCode = code;
        bytes memory custom = new bytes(32);
        custom[0] = bytes1(rtType);
        custom = bytesCopy(bytesname, custom, 1);

        assembly {
        		//create2指令参数1为转账额，参数2为合约字节码长度，参数3为字节码，参数4为虚拟机类型+合约名
            addr := create2(0, add(bytesCode,0x20), mload(bytesCode), mload(add(custom, 32)))
        }
    }
}