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short-circuit aliases

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Folkert 2022-02-28 23:37:33 +01:00
parent f30c07edd0
commit c18befeccf
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3 changed files with 24 additions and 22 deletions
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39
compiler/solve/src/solve.rs
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@ -82,6 +82,23 @@ pub struct Env {
pub aliases: MutMap<Symbol, Alias>,
}
impl Env {
fn get_var_by_symbol(&self, symbol: &Symbol) -> Option<Variable> {
self.vars_by_symbol.get(symbol).copied()
}
fn insert_symbol_var_if_vacant(&mut self, symbol: Symbol, var: Variable) {
match self.vars_by_symbol.entry(symbol) {
Entry::Occupied(_) => {
// keep the existing value
}
Entry::Vacant(vacant) => {
vacant.insert(var);
}
}
}
}
const DEFAULT_POOLS: usize = 8;
#[derive(Clone, Debug)]
@ -312,7 +329,7 @@ fn solve(
}
}
Lookup(symbol, expectation, region) => {
match env.vars_by_symbol.get(symbol) {
match env.get_var_by_symbol(symbol) {
Some(var) => {
// Deep copy the vars associated with this symbol before unifying them.
// Otherwise, suppose we have this:
@ -335,7 +352,7 @@ fn solve(
// then we copy from that module's Subs into our own. If the value
// is being looked up in this module, then we use our Subs as both
// the source and destination.
let actual = deep_copy_var(subs, rank, pools, *var);
let actual = deep_copy_var(subs, rank, pools, var);
let expected = type_to_var(
subs,
rank,
@ -484,14 +501,7 @@ fn solve(
let mut new_env = env.clone();
for (symbol, loc_var) in local_def_vars.iter() {
match new_env.vars_by_symbol.entry(*symbol) {
Entry::Occupied(_) => {
// keep the existing value
}
Entry::Vacant(vacant) => {
vacant.insert(loc_var.value);
}
}
new_env.insert_symbol_var_if_vacant(*symbol, loc_var.value);
}
stack.push(Work::Constraint {
@ -625,14 +635,7 @@ fn solve(
let mut new_env = env.clone();
for (symbol, loc_var) in local_def_vars.iter() {
match new_env.vars_by_symbol.entry(*symbol) {
Entry::Occupied(_) => {
// keep the existing value
}
Entry::Vacant(vacant) => {
vacant.insert(loc_var.value);
}
}
new_env.insert_symbol_var_if_vacant(*symbol, loc_var.value);
}
// Note that this vars_by_symbol is the one returned by the