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record update foundations

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Folkert 2020-10-03 21:44:25 +02:00
parent c8e5acf142
commit 16ec417324
4 changed files with 71 additions and 1 deletions
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60
compiler/mono/src/ir.rs
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@ -680,12 +680,18 @@ pub enum Expr<'a> {
arguments: &'a [Symbol],
},
Struct(&'a [Symbol]),
AccessAtIndex {
index: u64,
field_layouts: &'a [Layout<'a>],
structure: Symbol,
wrapped: Wrapped,
},
Update {
structure: Symbol,
field_layouts: &'a [Layout<'a>],
updates: &'a [(u64, Symbol)],
},
Array {
elem_layout: Layout<'a>,
@ -846,6 +852,23 @@ impl<'a> Expr<'a> {
.text(format!("Index {} ", index))
.append(symbol_to_doc(alloc, *structure)),
Update {
structure, updates, ..
} => {
let it = updates.iter().map(|(index, symbol)| {
alloc
.text(format!(".{} => ", index))
.append(symbol_to_doc(alloc, *symbol))
});
alloc
.text("Update ")
.append(symbol_to_doc(alloc, *structure))
.append(alloc.text("{ "))
.append(alloc.intersperse(it, ", "))
.append(alloc.text(" }"))
}
RuntimeErrorFunction(s) => alloc.text(format!("ErrorFunction {}", s)),
}
}
@ -2017,7 +2040,12 @@ pub fn with_hole<'a>(
}
}
Update { .. } => todo!("record access/accessor/update"),
Update {
record_var, // Variable,
ext_var, // Variable,
symbol, // Symbol,
updates, // SendMap<Lowercase, Field>,
} => todo!("record access/accessor/update"),
Closure {
function_type,
@ -2965,6 +2993,36 @@ fn substitute_in_expr<'a>(
}),
None => None,
},
Update {
structure,
field_layouts,
updates,
} => {
let mut did_change = false;
let new_updates = Vec::from_iter_in(
updates.iter().map(|(index, s)| match substitute(subs, *s) {
None => (*index, *s),
Some(s) => {
did_change = true;
(*index, s)
}
}),
arena,
);
if did_change {
let updates = new_updates.into_bump_slice();
Some(Update {
structure: *structure,
field_layouts,
updates,
})
} else {
None
}
}
}
}