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| object "Contract" { | |
| code { | |
| datacopy(0, dataoffset("runtime"), datasize("runtime")) | |
| return(0, datasize("runtime")) | |
| } | |
| object "runtime" { | |
| code { | |
| if iszero(calledByOwner()) { revert(0, 0) } | |
| switch selector() | |
| case 0x00 { | |
| let tokenIn := shr(0x60, calldataload(0x01)) | |
| let tokenOut := shr(0x60, calldataload(0x15)) | |
| let amountIn := decodeAsUint112(0x29) | |
| let pair := getPair(tokenIn, tokenOut) | |
| let reserveOut, reserveIn := getReserves(pair) | |
| let amountOut := getAmountOut(amountIn, reserveIn, reserveOut) | |
| transfer(tokenIn, pair, amountIn) | |
| mstore(0, shl(0xe0, 0x022c0d9f)) mstore(add(0, 0x04), amountOut) | |
| mstore(add(0, 0x44), address()) mstore(add(0, 0x64), 0x80) | |
| if iszero(call(gas(), pair, 0, 0, 0x84, 0, 0)) { revert(0, 0) } | |
| } | |
| case 0x01 { | |
| let tokenIn := shr(0x60, calldataload(0x01)) | |
| let tokenOut := shr(0x60, calldataload(0x15)) | |
| let amountIn := decodeAsUint112(0x29) | |
| let pair := getPair(tokenIn, tokenOut) | |
| let reserveIn, reserveOut := getReserves(pair) | |
| let amountOut := getAmountOut(amountIn, reserveIn, reserveOut) | |
| transfer(tokenIn, pair, amountIn) | |
| mstore(0, shl(0xe0, 0x022c0d9f)) mstore(add(0, 0x24), amountOut) | |
| mstore(add(0, 0x44), address()) mstore(add(0, 0x64), 0x80) | |
| if iszero(call(gas(), pair, 0, 0, 0x84, 0, 0)) { revert(0, 0) } | |
| } | |
| case 0x02 { revert(0, 0) } // Withdraw | |
| default { | |
| revert(0, 0) | |
| } | |
| function calledByOwner() -> cbo { | |
| cbo := eq(0x0000000000000000000000000000000000000000, caller()) | |
| } | |
| function selector() -> s { // 1 byte | |
| s := shr(0xf8, calldataload(0)) | |
| } | |
| function decodeAsUint112(_pos) -> v { // 2^112-1 | |
| v := shr(sub(0x100, mul(8, sub(calldatasize(), _pos))), calldataload(_pos)) | |
| } | |
| // ↓ This sucks and should be deprecated | |
| function getPair(token0, token1) -> p { | |
| mstore(0, shl(0xe0, 0xe6a43905)) mstore(add(0, 0x04), token0) mstore(add(0, 0x24), token1) | |
| if iszero(staticcall(gas(), 0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f, 0, 0x44, 0x44, 0x20)) { revert(0, 0) } | |
| p := mload(0x44) | |
| } | |
| function getAmountOut(amountIn, reserveIn, reserveOut) -> v { | |
| let aiwf := mul(amountIn, 9970) | |
| v := div(mul(reserveOut, aiwf), add(mul(reserveIn,10000), aiwf)) | |
| } | |
| function getReserves(pair) -> r0, r1 { | |
| mstore(0, shl(0xe0, 0x0902f1ac)) | |
| if iszero(staticcall(gas(), pair, 0, 0x04, 0x04, 0x40)) { revert(0, 0) } | |
| r0 := mload(0x04) | |
| r1 := mload(0x24) | |
| } | |
| function transfer(token, dst, wad) { | |
| mstore(0, shl(0xe0, 0xa9059cbb)) mstore(add(0, 0x04), dst) mstore(add(0, 0x24), wad) | |
| if iszero(call(gas(), token, 0, 0, 0x44, 0, 0)) { revert(0, 0) } | |
| } | |
| /* ---------- Staging functions ---------- */ | |
| function getPairNew(token0, token1) -> p { revert(0, 0) } | |
| function sortTokens(tokenA, tokenB) -> token0, token1 { revert(0, 0) } | |
| } | |
| } | |
| } |
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Credit to @0Xff