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Opcode.swapPosition()

Get stack position swapped by SWAP opcode (1-16). 
import { swapPosition, SWAP1, SWAP16 } from 'tevm/Opcode'

swapPosition(SWAP1)   // 1
swapPosition(SWAP16)  // 16

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Parameters

  • opcode: BrandedOpcode - Opcode to check

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Returns

number | undefined - Position (1-16) or undefined if not SWAP

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Stack Semantics

SWAP1:  [..., b, a] → [..., a, b]              (swap top 2)
SWAP2:  [..., c, b, a] → [..., a, b, c]        (swap top with 3rd)
SWAP16: [..., q, ..., a] → [..., a, ..., q]    (swap top with 17th)