Created LibAbiEncoder with fillOrderNoThrow
This commit is contained in:
Greg Hysen
Amir Bandeali
parent
7fadba59e7
commit
5790ed7ba9
@ -22,12 +22,14 @@ pragma experimental ABIEncoderV2;
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import "./libs/LibMath.sol";
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import "./libs/LibOrder.sol";
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import "./libs/LibFillResults.sol";
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import "./libs/LibAbiEncoder.sol";
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import "./mixins/MExchangeCore.sol";
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contract MixinWrapperFunctions is
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LibMath,
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LibFillResults,
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LibAbiEncoder,
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MExchangeCore
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{
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/// @dev Fills the input order. Reverts if exact takerAssetFillAmount not filled.
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@ -68,177 +70,25 @@ contract MixinWrapperFunctions is
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public
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returns (FillResults memory fillResults)
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{
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// We need to call MExchangeCore.fillOrder using a delegatecall in
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// assembly so that we can intercept a call that throws. For this, we
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// need the input encoded in memory in the Ethereum ABIv2 format [1].
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// | Area | Offset | Length | Contents |
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// | -------- |--------|---------|-------------------------------------------- |
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// | Header | 0x00 | 4 | function selector |
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// | Params | | 3 * 32 | function parameters: |
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// | | 0x00 | | 1. offset to order (*) |
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// | | 0x20 | | 2. takerAssetFillAmount |
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// | | 0x40 | | 3. offset to signature (*) |
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// | Data | | 12 * 32 | order: |
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// | | 0x000 | | 1. senderAddress |
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// | | 0x020 | | 2. makerAddress |
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// | | 0x040 | | 3. takerAddress |
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// | | 0x060 | | 4. feeRecipientAddress |
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// | | 0x080 | | 5. makerAssetAmount |
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// | | 0x0A0 | | 6. takerAssetAmount |
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// | | 0x0C0 | | 7. makerFeeAmount |
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// | | 0x0E0 | | 8. takerFeeAmount |
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// | | 0x100 | | 9. expirationTimeSeconds |
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// | | 0x120 | | 10. salt |
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// | | 0x140 | | 11. Offset to makerAssetData (*) |
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// | | 0x160 | | 12. Offset to takerAssetData (*) |
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// | | 0x180 | 32 | makerAssetData Length |
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// | | 0x1A0 | ** | makerAssetData Contents |
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// | | 0x1C0 | 32 | takerAssetData Length |
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// | | 0x1E0 | ** | takerAssetData Contents |
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// | | 0x200 | 32 | signature Length |
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// | | 0x220 | ** | signature Contents |
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// * Offsets are calculated from the beginning of the current area: Header, Params, Data:
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// An offset stored in the Params area is calculated from the beginning of the Params section.
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// An offset stored in the Data area is calculated from the beginning of the Data section.
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// ** The length of dynamic array contents are stored in the field immediately preceeding the contents.
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// [1]: https://solidity.readthedocs.io/en/develop/abi-spec.html
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bytes4 fillOrderSelector = this.fillOrder.selector;
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// ABI encode calldata for `fillOrder`
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(
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uint256 calldataBegin,
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uint256 calldataLength
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) = abiEncodeFillOrder(
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order,
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takerAssetFillAmount,
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signature,
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this.fillOrder.selector
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);
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// Delegate to `fillOrder` and handle any exceptions gracefully
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assembly {
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// Areas below may use the following variables:
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// 1. <area>Start -- Start of this area in memory
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// 2. <area>End -- End of this area in memory. This value may
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// be precomputed (before writing contents),
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// or it may be computed as contents are written.
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// 3. <area>Offset -- Current offset into area. If an area's End
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// is precomputed, this variable tracks the
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// offsets of contents as they are written.
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/////// Setup Header Area ///////
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// Load free memory pointer
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let headerAreaStart := mload(0x40)
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mstore(headerAreaStart, fillOrderSelector)
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let headerAreaEnd := add(headerAreaStart, 0x4)
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/////// Setup Params Area ///////
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// This area is preallocated and written to later.
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// This is because we need to fill in offsets that have not yet been calculated.
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let paramsAreaStart := headerAreaEnd
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let paramsAreaEnd := add(paramsAreaStart, 0x60)
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let paramsAreaOffset := paramsAreaStart
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/////// Setup Data Area ///////
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let dataAreaStart := paramsAreaEnd
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let dataAreaEnd := dataAreaStart
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// Offset from the source data we're reading from
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let sourceOffset := order
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// arrayLenBytes and arrayLenWords track the length of a dynamically-allocated bytes array.
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let arrayLenBytes := 0
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let arrayLenWords := 0
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/////// Write order Struct ///////
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// Write memory location of Order, relative to the start of the
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// parameter list, then increment the paramsAreaOffset respectively.
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mstore(paramsAreaOffset, sub(dataAreaEnd, paramsAreaStart))
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paramsAreaOffset := add(paramsAreaOffset, 0x20)
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// Write values for each field in the order
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// It would be nice to use a loop, but we save on gas by writing
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// the stores sequentially.
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mstore(dataAreaEnd, mload(sourceOffset)) // makerAddress
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mstore(add(dataAreaEnd, 0x20), mload(add(sourceOffset, 0x20))) // takerAddress
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mstore(add(dataAreaEnd, 0x40), mload(add(sourceOffset, 0x40))) // feeRecipientAddress
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mstore(add(dataAreaEnd, 0x60), mload(add(sourceOffset, 0x60))) // senderAddress
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mstore(add(dataAreaEnd, 0x80), mload(add(sourceOffset, 0x80))) // makerAssetAmount
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mstore(add(dataAreaEnd, 0xA0), mload(add(sourceOffset, 0xA0))) // takerAssetAmount
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mstore(add(dataAreaEnd, 0xC0), mload(add(sourceOffset, 0xC0))) // makerFeeAmount
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mstore(add(dataAreaEnd, 0xE0), mload(add(sourceOffset, 0xE0))) // takerFeeAmount
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mstore(add(dataAreaEnd, 0x100), mload(add(sourceOffset, 0x100))) // expirationTimeSeconds
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mstore(add(dataAreaEnd, 0x120), mload(add(sourceOffset, 0x120))) // salt
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mstore(add(dataAreaEnd, 0x140), mload(add(sourceOffset, 0x140))) // Offset to makerAssetData
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mstore(add(dataAreaEnd, 0x160), mload(add(sourceOffset, 0x160))) // Offset to takerAssetData
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dataAreaEnd := add(dataAreaEnd, 0x180)
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sourceOffset := add(sourceOffset, 0x180)
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// Write offset to <order.makerAssetData>
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mstore(add(dataAreaStart, mul(10, 0x20)), sub(dataAreaEnd, dataAreaStart))
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// Calculate length of <order.makerAssetData>
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sourceOffset := mload(add(order, 0x140)) // makerAssetData
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arrayLenBytes := mload(sourceOffset)
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sourceOffset := add(sourceOffset, 0x20)
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arrayLenWords := div(add(arrayLenBytes, 0x1F), 0x20)
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// Write length of <order.makerAssetData>
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mstore(dataAreaEnd, arrayLenBytes)
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dataAreaEnd := add(dataAreaEnd, 0x20)
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// Write contents of <order.makerAssetData>
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for {let i := 0} lt(i, arrayLenWords) {i := add(i, 1)} {
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mstore(dataAreaEnd, mload(sourceOffset))
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dataAreaEnd := add(dataAreaEnd, 0x20)
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sourceOffset := add(sourceOffset, 0x20)
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}
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// Write offset to <order.takerAssetData>
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mstore(add(dataAreaStart, mul(11, 0x20)), sub(dataAreaEnd, dataAreaStart))
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// Calculate length of <order.takerAssetData>
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sourceOffset := mload(add(order, 0x160)) // takerAssetData
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arrayLenBytes := mload(sourceOffset)
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sourceOffset := add(sourceOffset, 0x20)
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arrayLenWords := div(add(arrayLenBytes, 0x1F), 0x20)
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// Write length of <order.takerAssetData>
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mstore(dataAreaEnd, arrayLenBytes)
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dataAreaEnd := add(dataAreaEnd, 0x20)
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// Write contents of <order.takerAssetData>
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for {let i := 0} lt(i, arrayLenWords) {i := add(i, 1)} {
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mstore(dataAreaEnd, mload(sourceOffset))
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dataAreaEnd := add(dataAreaEnd, 0x20)
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sourceOffset := add(sourceOffset, 0x20)
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}
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/////// Write takerAssetFillAmount ///////
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mstore(paramsAreaOffset, takerAssetFillAmount)
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paramsAreaOffset := add(paramsAreaOffset, 0x20)
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/////// Write signature ///////
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// Write offset to paramsArea
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mstore(paramsAreaOffset, sub(dataAreaEnd, paramsAreaStart))
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// Calculate length of signature
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sourceOffset := signature
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arrayLenBytes := mload(sourceOffset)
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sourceOffset := add(sourceOffset, 0x20)
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arrayLenWords := div(add(arrayLenBytes, 0x1F), 0x20)
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// Write length of signature
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mstore(dataAreaEnd, arrayLenBytes)
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dataAreaEnd := add(dataAreaEnd, 0x20)
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// Write contents of signature
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for {let i := 0} lt(i, arrayLenWords) {i := add(i, 1)} {
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mstore(dataAreaEnd, mload(sourceOffset))
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dataAreaEnd := add(dataAreaEnd, 0x20)
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sourceOffset := add(sourceOffset, 0x20)
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}
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// Execute delegatecall
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let success := delegatecall(
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gas, // forward all gas, TODO: look into gas consumption of assert/throw
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address, // call address of this contract
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headerAreaStart, // pointer to start of input
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sub(dataAreaEnd, headerAreaStart), // length of input
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headerAreaStart, // write output over input
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calldataBegin, // pointer to start of input
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calldataLength, // length of input
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calldataBegin, // write output over input
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128 // output size is 128 bytes
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)
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switch success
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@ -249,10 +99,10 @@ contract MixinWrapperFunctions is
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mstore(add(fillResults, 96), 0)
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}
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case 1 {
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mstore(fillResults, mload(headerAreaStart))
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mstore(add(fillResults, 32), mload(add(headerAreaStart, 32)))
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mstore(add(fillResults, 64), mload(add(headerAreaStart, 64)))
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mstore(add(fillResults, 96), mload(add(headerAreaStart, 96)))
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mstore(fillResults, mload(calldataBegin))
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mstore(add(fillResults, 32), mload(add(calldataBegin, 32)))
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mstore(add(fillResults, 64), mload(add(calldataBegin, 64)))
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mstore(add(fillResults, 96), mload(add(calldataBegin, 96)))
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}
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}
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return fillResults;
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215
packages/contracts/src/2.0.0/protocol/Exchange/libs/LibAbiEncoder.sol
vendored
Normal file
215
packages/contracts/src/2.0.0/protocol/Exchange/libs/LibAbiEncoder.sol
vendored
Normal file
@ -0,0 +1,215 @@
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/*
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Copyright 2018 ZeroEx Intl.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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pragma solidity 0.4.24;
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pragma experimental ABIEncoderV2;
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import "./LibOrder.sol";
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contract LibAbiEncoder {
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/// @dev ABI encodes calldata for `fillOrder` in memory and returns the address range.
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/// This range can be passed into `call` or `delegatecall` to invoke an external
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/// call to `fillOrder`.
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/// @param order Order struct containing order specifications.
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/// @param takerAssetFillAmount Desired amount of takerAsset to sell.
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/// @param signature Proof that order has been created by maker.
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/// @return calldataBegin Memory address of ABI encoded calldata.
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/// @return calldataLength Lenfgth of ABI encoded calldata.
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function abiEncodeFillOrder(
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LibOrder.Order memory order,
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uint256 takerAssetFillAmount,
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bytes memory signature,
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bytes4 fillOrderSelector
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)
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public
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returns (
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uint256 calldataBegin,
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uint256 calldataLength
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)
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{
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// We need to call MExchangeCore.fillOrder using a delegatecall in
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// assembly so that we can intercept a call that throws. For this, we
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// need the input encoded in memory in the Ethereum ABIv2 format [1].
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// | Area | Offset | Length | Contents |
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// | -------- |--------|---------|-------------------------------------------- |
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// | Header | 0x00 | 4 | function selector |
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// | Params | | 3 * 32 | function parameters: |
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// | | 0x00 | | 1. offset to order (*) |
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// | | 0x20 | | 2. takerAssetFillAmount |
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// | | 0x40 | | 3. offset to signature (*) |
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// | Data | | 12 * 32 | order: |
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// | | 0x000 | | 1. senderAddress |
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// | | 0x020 | | 2. makerAddress |
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// | | 0x040 | | 3. takerAddress |
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// | | 0x060 | | 4. feeRecipientAddress |
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// | | 0x080 | | 5. makerAssetAmount |
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// | | 0x0A0 | | 6. takerAssetAmount |
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// | | 0x0C0 | | 7. makerFeeAmount |
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// | | 0x0E0 | | 8. takerFeeAmount |
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// | | 0x100 | | 9. expirationTimeSeconds |
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// | | 0x120 | | 10. salt |
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// | | 0x140 | | 11. Offset to makerAssetData (*) |
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// | | 0x160 | | 12. Offset to takerAssetData (*) |
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// | | 0x180 | 32 | makerAssetData Length |
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// | | 0x1A0 | ** | makerAssetData Contents |
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// | | 0x1C0 | 32 | takerAssetData Length |
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// | | 0x1E0 | ** | takerAssetData Contents |
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// | | 0x200 | 32 | signature Length |
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// | | 0x220 | ** | signature Contents |
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// * Offsets are calculated from the beginning of the current area: Header, Params, Data:
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// An offset stored in the Params area is calculated from the beginning of the Params section.
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// An offset stored in the Data area is calculated from the beginning of the Data section.
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// ** The length of dynamic array contents are stored in the field immediately preceeding the contents.
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// [1]: https://solidity.readthedocs.io/en/develop/abi-spec.html
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assembly {
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// Areas below may use the following variables:
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// 1. <area>Start -- Start of this area in memory
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// 2. <area>End -- End of this area in memory. This value may
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// be precomputed (before writing contents),
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// or it may be computed as contents are written.
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// 3. <area>Offset -- Current offset into area. If an area's End
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// is precomputed, this variable tracks the
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// offsets of contents as they are written.
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/////// Setup Header Area ///////
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// Load free memory pointer
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calldataBegin := mload(0x40)
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mstore(calldataBegin, fillOrderSelector)
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let headerAreaEnd := add(calldataBegin, 0x4)
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/////// Setup Params Area ///////
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// This area is preallocated and written to later.
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// This is because we need to fill in offsets that have not yet been calculated.
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let paramsAreaStart := headerAreaEnd
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let paramsAreaEnd := add(paramsAreaStart, 0x60)
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let paramsAreaOffset := paramsAreaStart
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/////// Setup Data Area ///////
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let dataAreaStart := paramsAreaEnd
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let dataAreaEnd := dataAreaStart
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// Offset from the source data we're reading from
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let sourceOffset := order
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// arrayLenBytes and arrayLenWords track the length of a dynamically-allocated bytes array.
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let arrayLenBytes := 0
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let arrayLenWords := 0
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/////// Write order Struct ///////
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// Write memory location of Order, relative to the start of the
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// parameter list, then increment the paramsAreaOffset respectively.
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mstore(paramsAreaOffset, sub(dataAreaEnd, paramsAreaStart))
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paramsAreaOffset := add(paramsAreaOffset, 0x20)
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// Write values for each field in the order
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// It would be nice to use a loop, but we save on gas by writing
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// the stores sequentially.
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mstore(dataAreaEnd, mload(sourceOffset)) // makerAddress
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mstore(add(dataAreaEnd, 0x20), mload(add(sourceOffset, 0x20))) // takerAddress
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mstore(add(dataAreaEnd, 0x40), mload(add(sourceOffset, 0x40))) // feeRecipientAddress
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mstore(add(dataAreaEnd, 0x60), mload(add(sourceOffset, 0x60))) // senderAddress
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mstore(add(dataAreaEnd, 0x80), mload(add(sourceOffset, 0x80))) // makerAssetAmount
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mstore(add(dataAreaEnd, 0xA0), mload(add(sourceOffset, 0xA0))) // takerAssetAmount
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mstore(add(dataAreaEnd, 0xC0), mload(add(sourceOffset, 0xC0))) // makerFeeAmount
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mstore(add(dataAreaEnd, 0xE0), mload(add(sourceOffset, 0xE0))) // takerFeeAmount
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mstore(add(dataAreaEnd, 0x100), mload(add(sourceOffset, 0x100))) // expirationTimeSeconds
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mstore(add(dataAreaEnd, 0x120), mload(add(sourceOffset, 0x120))) // salt
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mstore(add(dataAreaEnd, 0x140), mload(add(sourceOffset, 0x140))) // Offset to makerAssetData
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mstore(add(dataAreaEnd, 0x160), mload(add(sourceOffset, 0x160))) // Offset to takerAssetData
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dataAreaEnd := add(dataAreaEnd, 0x180)
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sourceOffset := add(sourceOffset, 0x180)
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// Write offset to <order.makerAssetData>
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mstore(add(dataAreaStart, mul(10, 0x20)), sub(dataAreaEnd, dataAreaStart))
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// Calculate length of <order.makerAssetData>
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sourceOffset := mload(add(order, 0x140)) // makerAssetData
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arrayLenBytes := mload(sourceOffset)
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sourceOffset := add(sourceOffset, 0x20)
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arrayLenWords := div(add(arrayLenBytes, 0x1F), 0x20)
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// Write length of <order.makerAssetData>
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mstore(dataAreaEnd, arrayLenBytes)
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dataAreaEnd := add(dataAreaEnd, 0x20)
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// Write contents of <order.makerAssetData>
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for {let i := 0} lt(i, arrayLenWords) {i := add(i, 1)} {
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mstore(dataAreaEnd, mload(sourceOffset))
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dataAreaEnd := add(dataAreaEnd, 0x20)
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sourceOffset := add(sourceOffset, 0x20)
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}
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// Write offset to <order.takerAssetData>
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mstore(add(dataAreaStart, mul(11, 0x20)), sub(dataAreaEnd, dataAreaStart))
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// Calculate length of <order.takerAssetData>
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sourceOffset := mload(add(order, 0x160)) // takerAssetData
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arrayLenBytes := mload(sourceOffset)
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sourceOffset := add(sourceOffset, 0x20)
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arrayLenWords := div(add(arrayLenBytes, 0x1F), 0x20)
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// Write length of <order.takerAssetData>
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mstore(dataAreaEnd, arrayLenBytes)
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dataAreaEnd := add(dataAreaEnd, 0x20)
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// Write contents of <order.takerAssetData>
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for {let i := 0} lt(i, arrayLenWords) {i := add(i, 1)} {
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mstore(dataAreaEnd, mload(sourceOffset))
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dataAreaEnd := add(dataAreaEnd, 0x20)
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||||
sourceOffset := add(sourceOffset, 0x20)
|
||||
}
|
||||
|
||||
/////// Write takerAssetFillAmount ///////
|
||||
mstore(paramsAreaOffset, takerAssetFillAmount)
|
||||
paramsAreaOffset := add(paramsAreaOffset, 0x20)
|
||||
|
||||
/////// Write signature ///////
|
||||
// Write offset to paramsArea
|
||||
mstore(paramsAreaOffset, sub(dataAreaEnd, paramsAreaStart))
|
||||
|
||||
// Calculate length of signature
|
||||
sourceOffset := signature
|
||||
arrayLenBytes := mload(sourceOffset)
|
||||
sourceOffset := add(sourceOffset, 0x20)
|
||||
arrayLenWords := div(add(arrayLenBytes, 0x1F), 0x20)
|
||||
|
||||
// Write length of signature
|
||||
mstore(dataAreaEnd, arrayLenBytes)
|
||||
dataAreaEnd := add(dataAreaEnd, 0x20)
|
||||
|
||||
// Write contents of signature
|
||||
for {let i := 0} lt(i, arrayLenWords) {i := add(i, 1)} {
|
||||
mstore(dataAreaEnd, mload(sourceOffset))
|
||||
dataAreaEnd := add(dataAreaEnd, 0x20)
|
||||
sourceOffset := add(sourceOffset, 0x20)
|
||||
}
|
||||
|
||||
// Set length of calldata
|
||||
calldataLength := sub(dataAreaEnd, calldataBegin)
|
||||
}
|
||||
|
||||
return (calldataBegin, calldataLength);
|
||||
}
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user