Richard Smith f0e940ddfd Initial support for builtin functions. (#3803) ...

For now, a builtin function is defined by specifying a string literal
initializer in a function declaration:

```carbon
fn MyBuiltin(a: i32) -> i32 = "builtin.name";
```

End-to-end support is included for a sample `"int.add"` builtin
performing integer addition, covering constant evaluation and code
generation.

The implementation here needs substantial refactoring before we'll be
ready to start adding more builtins. That refactoring work will be
coming next. This change is aiming to checkpoint some incremental
progress.

2024-03-21 20:46:34 +00:00

..

declaration

Add framework for the extern keyword. (#3755)

2024-03-08 16:01:12 +00:00

definition

Initial support for builtin functions. (#3803)

2024-03-21 20:46:34 +00:00