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A bit of a chonky commit, but this ports over the remaining (well,
almost) everything from the C implementation to the self-hosted
compiler.
The only things that really remain right now are (1) defer support
and (2) support for constants in local scopes. There were used barely
enough so for now their uses have been removed, but I'll implement
them back later. Not sure how useful (2) is though.
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... Someone forgot to add them into the repo for a while.
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There's still some work to be done when checking function call args,
etc, but the general mechanism of actually propagating the type back
up the AST is now here from the C compiler.
... Not to say that was very good, but it's passable enough for now.
More improvements to come in the future!
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It's not really a keyword like the other ones, but just handled
completely at the lexer level since it already knows the location of the
token, so it injects a string literal instead.
We also use this in the self-hosted compiler now for better error
reporting for where the error happened internally.
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There's also a `run.sh2` script which does the following:
- Compiles the C compiler `build/cupcc`
- Compiles the self-hosted compiler `build/cup.out` (with `cupcc`)
- Compiles the specified file on CLI with `build/cup.out`
- Runs this exectuable and shows the output
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