93 lines
3.3 KiB
Solidity
93 lines
3.3 KiB
Solidity
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// SPDX-License-Identifier: CC0-1.0
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pragma solidity >=0.7.6;
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contract MetaProxyFactory {
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/// @dev Creates a new proxy for `targetContract` with metadata from calldata.
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/// Copies everything from calldata except the first 4 bytes.
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/// @return addr A non-zero address if successful.
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function _metaProxyFromCalldata (address targetContract) internal returns (address addr) {
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// the following assembly code (init code + contract code) constructs a metaproxy.
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assembly {
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// load free memory pointer as per solidity convention
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let start := mload(64)
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// copy
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let ptr := start
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// deploy code (11 bytes) + first part of the proxy (21 bytes)
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mstore(ptr, 0x600b380380600b3d393df3363d3d373d3d3d3d60368038038091363936013d73)
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ptr := add(ptr, 32)
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// store the address of the contract to be called
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mstore(ptr, shl(96, targetContract))
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// 20 bytes
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ptr := add(ptr, 20)
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// the remaining proxy code...
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mstore(ptr, 0x5af43d3d93803e603457fd5bf300000000000000000000000000000000000000)
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// ...13 bytes
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ptr := add(ptr, 13)
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// now calculdate the size and copy the metadata
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// - 4 bytes function signature
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let size := sub(calldatasize(), 4)
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// copy
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calldatacopy(ptr, 4, size)
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ptr := add(ptr, size)
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// store the size of the metadata at the end of the bytecode
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mstore(ptr, size)
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ptr := add(ptr, 32)
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// The size is deploy code + contract code + calldatasize - 4 + 32.
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addr := create(0, start, sub(ptr, start))
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}
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}
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/// @dev Creates a proxy for `targetContract` with metadata from `metadata`.
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/// @return A non-zero address if successful.
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function _metaProxyFromBytes (address targetContract, bytes memory metadata) internal returns (address) {
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uint256 ptr;
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assembly {
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ptr := add(metadata, 32)
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}
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return _metaProxyFromMemory(targetContract, ptr, metadata.length);
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}
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/// @dev Creates a new proxy for `targetContract` with metadata from memory starting at `offset` and `length` bytes.
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/// @return addr A non-zero address if successful.
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function _metaProxyFromMemory (address targetContract, uint256 offset, uint256 length) internal returns (address addr) {
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// the following assembly code (init code + contract code) constructs a metaproxy.
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assembly {
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// load free memory pointer as per solidity convention
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let start := mload(64)
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// keep a copy
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let ptr := start
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// deploy code (11 bytes) + first part of the proxy (21 bytes)
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mstore(ptr, 0x600b380380600b3d393df3363d3d373d3d3d3d60368038038091363936013d73)
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ptr := add(ptr, 32)
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// store the address of the contract to be called
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mstore(ptr, shl(96, targetContract))
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// 20 bytes
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ptr := add(ptr, 20)
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// the remaining proxy code...
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mstore(ptr, 0x5af43d3d93803e603457fd5bf300000000000000000000000000000000000000)
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// ...13 bytes
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ptr := add(ptr, 13)
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// copy the metadata
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{
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for { let i := 0 } lt(i, length) { i := add(i, 32) } {
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mstore(add(ptr, i), mload(add(offset, i)))
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}
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}
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ptr := add(ptr, length)
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// store the size of the metadata at the end of the bytecode
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mstore(ptr, length)
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ptr := add(ptr, 32)
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// The size is deploy code + contract code + calldatasize - 4 + 32.
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addr := create(0, start, sub(ptr, start))
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}
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}
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}
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