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77 lines
3.4 KiB
77 lines
3.4 KiB
4 years ago
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// SPDX-License-Identifier: MIT
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4 years ago
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pragma solidity >=0.6.0 <0.9.0;
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4 years ago
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/**
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* @dev https://eips.ethereum.org/EIPS/eip-1167[EIP 1167] is a standard for
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* deploying minimal proxy contracts, also known as "clones".
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*
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* > To simply and cheaply clone contract functionality in an immutable way, this standard specifies
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* > a minimal bytecode implementation that delegates all calls to a known, fixed address.
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*
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* The library includes functions to deploy a proxy using either `create` (traditional deployment) or `create2`
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* (salted deterministic deployment). It also includes functions to predict the addresses of clones deployed using the
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* deterministic method.
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*/
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library Clones {
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/**
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* @dev Deploys and returns the address of a clone that mimics the behaviour of `master`.
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*
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* This function uses the create opcode, which should never revert.
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*/
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function clone(address master) internal returns (address instance) {
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// solhint-disable-next-line no-inline-assembly
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assembly {
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let ptr := mload(0x40)
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mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
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mstore(add(ptr, 0x14), shl(0x60, master))
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mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
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instance := create(0, ptr, 0x37)
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}
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require(instance != address(0), "ERC1167: create failed");
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}
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/**
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* @dev Deploys and returns the address of a clone that mimics the behaviour of `master`.
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*
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* This function uses the create2 opcode and a `salt` to deterministically deploy
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* the clone. Using the same `master` and `salt` multiple time will revert, since
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* the clones cannot be deployed twice at the same address.
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*/
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function cloneDeterministic(address master, bytes32 salt) internal returns (address instance) {
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// solhint-disable-next-line no-inline-assembly
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assembly {
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let ptr := mload(0x40)
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mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
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mstore(add(ptr, 0x14), shl(0x60, master))
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mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
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instance := create2(0, ptr, 0x37, salt)
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}
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require(instance != address(0), "ERC1167: create2 failed");
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}
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/**
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* @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
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*/
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function predictDeterministicAddress(address master, bytes32 salt, address deployer) internal pure returns (address predicted) {
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// solhint-disable-next-line no-inline-assembly
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assembly {
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let ptr := mload(0x40)
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mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
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mstore(add(ptr, 0x14), shl(0x60, master))
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mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf3ff00000000000000000000000000000000)
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mstore(add(ptr, 0x38), shl(0x60, deployer))
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mstore(add(ptr, 0x4c), salt)
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mstore(add(ptr, 0x6c), keccak256(ptr, 0x37))
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predicted := keccak256(add(ptr, 0x37), 0x55)
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}
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}
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/**
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* @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
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*/
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function predictDeterministicAddress(address master, bytes32 salt) internal view returns (address predicted) {
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return predictDeterministicAddress(master, salt, address(this));
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}
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}
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