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optimize Type::symbols()

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Folkert 2022-03-10 22:29:37 +01:00
parent 76a118db14
commit 4ce7221c39
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1 changed files with 51 additions and 55 deletions
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106
compiler/types/src/types.rs
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@ -713,11 +713,8 @@ impl Type {
}
}
pub fn symbols(&self) -> ImSet<Symbol> {
let mut found_symbols = ImSet::default();
symbols_help(self, &mut found_symbols);
found_symbols
pub fn symbols(&self) -> Vec<Symbol> {
symbols_help(self)
}
/// a shallow dealias, continue until the first constructor is not an alias.
@ -934,62 +931,61 @@ impl Type {
}
}
fn symbols_help(tipe: &Type, accum: &mut ImSet<Symbol>) {
fn symbols_help(initial: &Type) -> Vec<Symbol> {
use Type::*;
match tipe {
Function(args, closure, ret) => {
symbols_help(ret, accum);
symbols_help(closure, accum);
args.iter().for_each(|arg| symbols_help(arg, accum));
}
FunctionOrTagUnion(_, _, ext) => {
symbols_help(ext, accum);
}
RecursiveTagUnion(_, tags, ext) | TagUnion(tags, ext) => {
symbols_help(ext, accum);
tags.iter()
.map(|v| v.1.iter())
.flatten()
.for_each(|arg| symbols_help(arg, accum));
}
let mut output = vec![];
let mut stack = vec![initial];
Record(fields, ext) => {
symbols_help(ext, accum);
fields.values().for_each(|field| {
use RecordField::*;
while let Some(tipe) = stack.pop() {
match tipe {
Function(args, closure, ret) => {
stack.push(ret);
stack.push(closure);
stack.extend(args);
}
FunctionOrTagUnion(_, _, ext) => {
stack.push(ext);
}
RecursiveTagUnion(_, tags, ext) | TagUnion(tags, ext) => {
stack.push(ext);
stack.extend(tags.iter().map(|v| v.1.iter()).flatten());
}
match field {
Optional(arg) => symbols_help(arg, accum),
Required(arg) => symbols_help(arg, accum),
Demanded(arg) => symbols_help(arg, accum),
}
});
Record(fields, ext) => {
stack.push(ext);
stack.extend(fields.values().map(|field| field.as_inner()));
}
Alias {
symbol: alias_symbol,
actual: actual_type,
..
} => {
output.push(*alias_symbol);
stack.push(actual_type);
}
HostExposedAlias { name, actual, .. } => {
output.push(*name);
stack.push(actual);
}
Apply(symbol, args, _) => {
output.push(*symbol);
stack.extend(args);
}
Erroneous(Problem::CyclicAlias(alias, _, _)) => {
output.push(*alias);
}
RangedNumber(typ, _) => {
stack.push(typ);
}
EmptyRec | EmptyTagUnion | ClosureTag { .. } | Erroneous(_) | Variable(_) => {}
}
Alias {
symbol: alias_symbol,
actual: actual_type,
..
} => {
accum.insert(*alias_symbol);
symbols_help(actual_type, accum);
}
HostExposedAlias { name, actual, .. } => {
accum.insert(*name);
symbols_help(actual, accum);
}
Apply(symbol, args, _) => {
accum.insert(*symbol);
args.iter().for_each(|arg| symbols_help(arg, accum));
}
Erroneous(Problem::CyclicAlias(alias, _, _)) => {
accum.insert(*alias);
}
RangedNumber(typ, _) => {
symbols_help(typ, accum);
}
EmptyRec | EmptyTagUnion | ClosureTag { .. } | Erroneous(_) | Variable(_) => {}
}
output.sort();
output.dedup();
output
}
fn variables_help(tipe: &Type, accum: &mut ImSet<Variable>) {