Codegen changes arguments when a function is called through fast import

XoifailTheGod · July 2, 2025, 4:16pm

This bug is quite weird and I don’t fully understand exactly whats happening but from my understanding after update version 678 where codegen fast import was updated functions like string.format and even print return complete gibberish. Recently the SHA2-384 algorithm started failing every test and after localizing string.format eg local Format = string.format all tests pass

Now another issue thats come up at the same time is functions failing to compile to native when there is too many arguments.

As seen here, print also is returning complete gibberish

Reproduction Code:
SHA2-384:

github.com/daily3014/rbx-cryptography

src/Hashing/SHA2/SHA384.luau

main

--[=[
	Cryptography library: SHA384
	
	Return type: string
	Example usage:
		local Message = buffer.fromstring("Hello World")
		
		--------Usage Case 1--------
		local Result = SHA384(Message)
		
		--------Usage Case 2--------
		local OptionalSalt = buffer.fromstring("Salty")
		local Result = SHA384(Message, OptionalSalt)
--]=]

--!native
--!optimize 2
--!strict

local FRONT_VALUES = buffer.create(32)

This file has been truncated. show original

SHA2-512:

github.com/daily3014/rbx-cryptography

src/Hashing/SHA2/SHA512.luau

main

--[=[
	Cryptography library: SHA512
	
	Return type: string
	Example usage:
		local Message = buffer.fromstring("Hello World")
		
		--------Usage Case 1--------
		local Result = SHA512(Message)
		
		--------Usage Case 2--------
		local OptionalSalt = buffer.fromstring("Salty")
		local Result = SHA512(Message, OptionalSalt)
--]=]

--!native
--!optimize 2
--!strict

local FRONT_VALUES = buffer.create(32)

This file has been truncated. show original

And as for the tests used that caught the issue you can find them here: rbx-cryptography/tests at main · daily3014/rbx-cryptography · GitHub

Expected behavior

I expect to be able to use functions like string.format without needing to make them local for them to function properly.

WheretIB · July 2, 2025, 4:27pm

Thank you for the report.

We were able to reproduce the issue and will investigate the cause.

XoifailTheGod · July 2, 2025, 4:29pm

Thanks for the quick reply, let me know if you need anything else!

WheretIB · July 2, 2025, 5:44pm

The change causing the issue has been disabled.

Sorry for the inconvenience caused by it.

XoifailTheGod · July 2, 2025, 5:46pm

Awesome everything is working! Thanks

system · July 16, 2025, 5:46pm

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