mirror of https://github.com/embarklabs/embark.git
70 lines
2.2 KiB
Solidity
70 lines
2.2 KiB
Solidity
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/* solium-disable security/no-block-members */
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/* solium-disable security/no-inline-assembly */
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pragma solidity >=0.5.0 <0.6.0;
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/**
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* @title Proxy
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* @dev EIP1822
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*/
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contract Proxy {
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/**
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* @param constructData Constructor input data for initializing the proxy
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* @param contractLogic Address of the contract used as implementation logic for the proxy
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*/
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constructor(bytes memory constructData, address contractLogic) public {
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// save the code address
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assembly { // solium-disable-line
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sstore(0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7, contractLogic)
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}
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if (constructData.length == 0) {
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return;
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}
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(bool success, bytes memory _) = contractLogic.delegatecall(constructData); // solium-disable-line
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require(success, "Construction failed");
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}
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/**
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* @dev Fallback function allowing to perform a delegatecall to the given implementation.
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* This function will return whatever the implementation call returns
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*/
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function() external payable {
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assembly { // solium-disable-line
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let contractLogic := sload(0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7)
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calldatacopy(0x0, 0x0, calldatasize)
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let success := delegatecall(sub(gas, 10000), contractLogic, 0x0, calldatasize, 0, 0)
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let retSz := returndatasize
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returndatacopy(0, 0, retSz)
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switch success
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case 0 {
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revert(0, retSz)
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}
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default {
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return(0, retSz)
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}
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}
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}
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/**
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* @dev Tells the address of the implementation where every call will be delegated.
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* @return address of the implementation to which it will be delegated
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*/
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function implementation() public view returns (address) {
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address contractLogic;
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assembly { // solium-disable-line
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contractLogic := sload(0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7)
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}
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return contractLogic;
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}
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/**
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* @dev EIP897 proxy type
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* @return 1 to indicate not upgradable proxy
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*/
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function proxyType() public pure returns (uint256) {
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return 1;
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}
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}
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