Solidity Interface & Canonical Declaration
function swapExactETHForTokens(uint256 amountOutMin, address[] path, address to, uint256 deadline) external payable returns (uint256[] memory amounts)
使用随交易发送的精确原生以太坊（ETH）按指定路由兑换代币。
理论基础执行 Gas： 95,000 ~ 160,000 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) | swapExactETHForTokens(uint256,address[],address,uint256) 的 4 字节函数选择器 |
| 0x04 ~ 0x23 (32B) | uint256 | amountOutMin | 最低可接受的代币产出量 |
| 0x24 ~ 0x43 (32B) | address[] | path | 兑换跳点路径 |
| 0x44 ~ 0x63 (32B) | address | to | 代币接收地址 |
| 0x64 ~ 0x83 (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： swapExactETHForTokens(uint256,address[],address,uint256)
完整 256 位 Keccak 哈希： 0x7ff36ab5759d6a6f3666c17e7dae0b66684a53581fd3cada68e6fd19d01f9b11
截取前 4 字节 (Big-Endian)： 0x7ff36ab5
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 0x7ff36ab5 and branch
[0x0006] DUP1
[0x0007] PUSH4 0x7ff36ab5
[0x000c] EQ
[0x000d] PUSH2 0x0050
[0x0010] JUMPI // Jump to implementation if matched