{ "fileName": "Proxy.sol", "contractName": "Proxy", "source": "pragma solidity ^0.6.0;\n// SPDX-License-Identifier: MIT\n\n/**\n * @title Proxy\n * @dev Implements delegation of calls to other contracts, with proper\n * forwarding of return values and bubbling of failures.\n * It defines a fallback function that delegates all calls to the address\n * returned by the abstract _implementation() internal function.\n */\nabstract contract Proxy {\n /**\n * @dev Fallback function.\n * Implemented entirely in `_fallback`.\n */\n fallback () payable external {\n _fallback();\n }\n\n receive () payable external {\n _fallback();\n }\n\n /**\n * @return The Address of the implementation.\n */\n function _implementation() internal view virtual returns (address);\n\n /**\n * @dev Delegates execution to an implementation contract.\n * This is a low level function that doesn't return to its internal call site.\n * It will return to the external caller whatever the implementation returns.\n * @param implementation Address to delegate.\n */\n function _delegate(address implementation) internal {\n assembly {\n // Copy msg.data. We take full control of memory in this inline assembly\n // block because it will not return to Solidity code. We overwrite the\n // Solidity scratch pad at memory position 0.\n calldatacopy(0, 0, calldatasize())\n\n // Call the implementation.\n // out and outsize are 0 because we don't know the size yet.\n let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)\n\n // Copy the returned data.\n returndatacopy(0, 0, returndatasize())\n\n switch result\n // delegatecall returns 0 on error.\n case 0 { revert(0, returndatasize()) }\n default { return(0, returndatasize()) }\n }\n }\n\n /**\n * @dev Function that is run as the first thing in the fallback function.\n * Can be redefined in derived contracts to add functionality.\n * Redefinitions must call super._willFallback().\n */\n function _willFallback() internal virtual {\n }\n\n /**\n * @dev fallback implementation.\n * Extracted to enable manual triggering.\n */\n function _fallback() internal {\n _willFallback();\n _delegate(_implementation());\n }\n}\n", "sourcePath": "contracts/upgradeability/Proxy.sol", "sourceMap": "", 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