Solidity Interface & Canonical Declaration
function safeTransferFrom(address from, address to, uint256 tokenId) external
安全地将 NFT 代币从源地址划转到目标地址。如果接收方为智能合约,自动验证其是否实现了 onERC721Received 钩子。
理论基础执行 Gas: 45,000 ~ 85,000 gas
返回值类型: void
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) | safeTransferFrom(address,address,uint256) 的 4 字节函数选择器 |
| 0x04 ~ 0x23 (32B) | address | from | NFT 当前所有者地址 |
| 0x24 ~ 0x43 (32B) | address | to | NFT 接收者地址 |
| 0x44 ~ 0x63 (32B) | uint256 | tokenId | 待划转的 NFT 代币标识符 |
Keccak-256 密码学哈希推导链
标准 ASCII 签名字符串: safeTransferFrom(address,address,uint256)
完整 256 位 Keccak 哈希: 0x42842e0eb38857a7775b4e7364b2775df7325074d088e7fb39590cd6281184ed
截取前 4 字节 (Big-Endian): 0x42842e0e
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 0x42842e0e and branch
[0x0006] DUP1
[0x0007] PUSH4 0x42842e0e
[0x000c] EQ
[0x000d] PUSH2 0x0050
[0x0010] JUMPI // Jump to implementation if matched