Function: _swap(byte[1] dexId, uint256 fromAmount, byte[] swapPayload)

This uses the dexId to route the swap to the correct DEX logic.

Inputs

• dexId

  • Constraints: Should be one of 0x01, 0x02, 0x03, or 0x04.

  • Impact: The dexId of the DEX to be used (e.g., 0x01, 0x02, 0x03, or 0x04).

• fromAmount

  • Constraints: No constraints.

  • Impact: The amount of fromToken to be swapped.

• swapPayload

  • Constraints: No constraints.

  • Impact: The payload for the swap --- varies by DEX.

Branches and code coverage (including function calls)

Intended branches

• The function routes the swap based on dexId.

  Test coverage

Negative behavior

• The function reverts if dexId is not one of the supported DEX identifiers.

  Negative test

Function call analysis

• _swapUniswapV2(0x01/0x02, fromAmount, swapPayload)

  • What is controllable? 0x01 or 0x02 (from _swap), fromAmount, and swapPayload.

  • If return value controllable, how is it used and how can it go wrong? N/A.

  • What happens if it reverts, reenters, or does other unusual control flow? If this reverts, the entire call fails --- no reentrancy issues.

• _swapUniswapV3(fromAmount, swapPayload)

  • What is controllable? fromAmount and swapPayload.

  • If return value controllable, how is it used and how can it go wrong? N/A.

  • What happens if it reverts, reenters, or does other unusual control flow? If this reverts, the entire call fails --- no reentrancy issues.

• _swapWithCurve(swapPayload)

  • What is controllable? swapPayload.

  • If return value controllable, how is it used and how can it go wrong? N/A.

  • What happens if it reverts, reenters, or does other unusual control flow? If this reverts, the entire call fails --- no reentrancy issues.