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document io byte layout above flowInit assembly #466

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document io byte layout above flowInit assembly #466

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7 changes: 7 additions & 0 deletions src/concrete/Flow.sol
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Expand Up @@ -200,6 +200,13 @@ contract Flow is ERC721Holder, ERC1155Holder, Multicall, ReentrancyGuard, IInter
config.deployer.deployExpression2(config.bytecode, config.constants);

{
// `io` is a `bytes` array. The deployer encodes per-
// source `(inputs, outputs)` pairs as consecutive
// bytes, with source 0 first. Flow only uses one
// source (`FLOW_ENTRYPOINT == 0`), so byte 0 is
// `flowInputs` and byte 1 is `flowOutputs`.
// `add(io, 0x20)` skips the bytes-length word to
// land on the first data word.
uint256 flowInputs;
uint256 flowOutputs;
assembly ("memory-safe") {
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