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Original file line number | Diff line number | Diff line change |
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// File: contracts/Proxy.sol | ||
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pragma solidity 0.6.12; | ||
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contract Proxy { | ||
// Code position in storage is keccak256("PROXIABLE") = "0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7" | ||
uint256 constant PROXIABLE_MEM_SLOT = 0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7; | ||
// constructor(bytes memory constructData, address contractLogic) public { | ||
constructor(address contractLogic) public { | ||
// Verify a valid address was passed in | ||
require(contractLogic != address(0), "Contract Logic cannot be 0x0"); | ||
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// save the code address | ||
assembly { // solium-disable-line | ||
sstore(PROXIABLE_MEM_SLOT, contractLogic) | ||
} | ||
} | ||
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fallback() external payable { | ||
assembly { // solium-disable-line | ||
let contractLogic := sload(PROXIABLE_MEM_SLOT) | ||
let ptr := mload(0x40) | ||
calldatacopy(ptr, 0x0, calldatasize()) | ||
let success := delegatecall(gas(), contractLogic, ptr, calldatasize(), 0, 0) | ||
let retSz := returndatasize() | ||
returndatacopy(ptr, 0, retSz) | ||
switch success | ||
case 0 { | ||
revert(ptr, retSz) | ||
} | ||
default { | ||
return(ptr, retSz) | ||
} | ||
} | ||
} | ||
} |
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