Solidity Interface & Canonical Declaration
function swapExactTokensForETH(uint256 amountIn, uint256 amountOutMin, address[] path, address to, uint256 deadline) external returns (uint256[] memory amounts)
将精确数量的 ERC-20 代币兑换为原生以太坊(ETH),并直接退还至接收者账户。
理论基础执行 Gas: 100,000 ~ 170,000 gas
返回值类型: uint256[]
Calldata 调用数据 ABI 编码布局账本
| Calldata Offset | Type | Parameter Name | Semantic Role |
|---|---|---|---|
| 0x00 ~ 0x03 (4B) | bytes4 | Method ID (msg.sig) | swapExactTokensForETH(uint256,uint256,address[],address,uint256) 的 4 字节函数选择器 |
| 0x04 ~ 0x23 (32B) | uint256 | amountIn | 支付的代币输入量 |
| 0x24 ~ 0x43 (32B) | uint256 | amountOutMin | 最低可接受的 ETH 输出数量(wei) |
| 0x44 ~ 0x63 (32B) | address[] | path | 交易路径 |
| 0x64 ~ 0x83 (32B) | address | to | 接收 ETH 的账户 |
| 0x84 ~ 0xa3 (32B) | uint256 | deadline | 截止时间戳 |
Keccak-256 密码学哈希推导链
标准 ASCII 签名字符串: swapExactTokensForETH(uint256,uint256,address[],address,uint256)
完整 256 位 Keccak 哈希: 0x18cbafe5fb6ab7d2558a55ccc138a3172aa304c3a08214c1ab07223dcb9e7f8e
截取前 4 字节 (Big-Endian): 0x18cbafe5
EVM 运行时调度器汇编代码特征 (Dispatcher Opcodes)
// 1. Load the first 32 bytes of transaction calldata
[0x0000] PUSH1 0x00
[0x0002] CALLDATALOAD
// 2. Right-shift by 224 bits (0xe0) to isolate the 4-byte selector
[0x0003] PUSH1 0xe0
[0x0005] SHR
// 3. Match against target selector 0x18cbafe5 and branch
[0x0006] DUP1
[0x0007] PUSH4 0x18cbafe5
[0x000c] EQ
[0x000d] PUSH2 0x0050
[0x0010] JUMPI // Jump to implementation if matched