History of FunC

Initial version

The initial version of FunC was developed by Telegram, but active development stopped after May 2020. We refer to the May 2020 release as the “initial” version.

Version 0.1.0

Released in May 2022.

New features:

• Constants
• Extended string literals
• Semver pragmas
• Includes

Fixes:

• Resolved rare bugs in Asm.fif.

Version 0.2.0

Released in Aug 2022.

New features:

• Unbalanced if/else branches, where some branches return a value while others do not.

Fixes:

• FunC incorrectly handles while(false) loops (#377).
• FunC generates incorrect code for if/else branches (#374).
• FunC incorrectly returns from conditions in inline functions (#370).
• Asm.fif: splitting large function bodies incorrectly interferes with inline (#375).

Version 0.3.0

Released in Oct 2022.

New features:

• Support for multiline asm statements.
• Allow duplicate definitions of identical constants and asm statements.
• Enable bitwise operations for constants.

Version 0.4.0

Released in Jan 2023.

New features:

• try/catch statements
• throw_arg functions
• Support for in-place modification and mass assignment of global variables, e.g., a~inc() and (a, b) = (3, 5), where a is global.

Fixes:

• Disallowed ambiguous modification of local variables after their usage in the same expression. For example, var x = (ds, ds~load_uint(32), ds~load_unit(64)); is forbidden, while var x = (ds~load_uint(32), ds~load_unit(64), ds); is allowed.
• Allowed empty inline functions.
• Fixed a rare optimization bug in while loops.