mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
50 lines
1.4 KiB
Solidity
50 lines
1.4 KiB
Solidity
contract D {
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uint public x;
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constructor(uint a) {
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x = a;
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}
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}
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// TODO: this is horrible and hopefully avoided at the spec level
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function adjustContractCodeForArgSize(bytes memory x, uint16 argSize)
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{
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assembly {
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let memPos := add(x, 32)
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if eq(shr(232, mload(memPos)), 0xef0001) {
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let numCodeSections := shr(240, mload(add(memPos, 7)))
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let dataSectionSizeOffset := add(memPos, add(10, mul(numCodeSections, 2)))
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let tmp := mload(dataSectionSizeOffset)
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let dataSectionSize := shr(240, tmp)
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dataSectionSize := add(dataSectionSize, argSize)
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if gt(dataSectionSize, 0xFFFF) { revert(0,0) }
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mstore(dataSectionSizeOffset, or(shr(16, shl(16, tmp)), shl(240, dataSectionSize)))
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}
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}
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}
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contract C {
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function createDSalted(bytes32 salt, uint arg) public {
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bytes memory creationCode = type(D).creationCode;
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adjustContractCodeForArgSize(creationCode, 32);
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address predictedAddress = address(uint160(uint(keccak256(abi.encodePacked(
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bytes1(0xff),
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address(this),
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salt,
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keccak256(abi.encodePacked(
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creationCode,
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arg
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))
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)))));
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D d = new D{salt: salt}(arg);
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require(address(d) == predictedAddress, "Address mismatch.");
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}
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}
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// ====
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// EVMVersion: >=constantinople
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// compileViaYul: also
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// ----
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// createDSalted(bytes32,uint256): 42, 64 ->
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// gas irOptimized: 100021
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// gas legacy: 104455
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