bobcat-proxy 0.7.47

bobcat-sdk utilities for creating proxy code on Arbitrum Stylus.
Documentation 
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// metamorphic-on-fn.huff: A proxy that delegatecalls into the deployer
// address if the migrate() function is called, forwarding all calldata,
// including the selector. Otherwise, it delegatecalls into its
// implementation slot. Make sure to call the migrate function the moment
// this was created. Be careful to enforce access control!

#define constant SLOT_IMPL = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc

#define function migrate() nonpayable returns ()

#define constant ADDR_DEPLOYER = 0x1000000000000000000000000000000000000001

#define macro MAIN() = takes(0) returns(0) {
	calldatasize 0x0 0x0 calldatacopy
	0x0 calldataload 0xe0 shr __FUNC_SIG(migrate) eq MIGRATE jumpi
	ALL jump
	MIGRATE:
		[ADDR_DEPLOYER] CONT jump
	ALL:
		[SLOT_IMPL] sload
	CONT:
		0x0 calldatasize 0x0 0x0 swap4 gas delegatecall
		returndatasize 0x0 0x0 returndatacopy
		returndatasize 0x0 dup3 RETURN jumpi revert
	RETURN:
		return
}

#define macro CONSTRUCTOR() = takes(0) returns(0) {
	codesize 0x20 sub calldataload [SLOT_IMPL] sstore
}