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use super::*;
impl TypeChecker {
pub(super) fn check(&mut self, items: &[TopLevel], base_dir: Option<&str>) {
// Iron — A3: load + integrate dependency modules FIRST so the
// alias map is populated before `build_signatures`
// canonicalises local fn / type annotations. Without this, a
// bare reference to an imported type in a local signature
// stays as `Type::Named("Discount")` instead of resolving to
// `Type::Named("Pricing.Discount.Discount")`, and the strict
// matcher then rejects every call site of that function.
let mut loaded_modules: Vec<crate::source::LoadedModule> = Vec::new();
if let Some(base) = base_dir
&& let Some(module) = Self::module_decl(items)
{
match crate::source::load_module_tree(&module.depends, base) {
Ok(modules) => {
self.integrate_loaded_modules(&modules);
loaded_modules = modules;
}
Err(e) => self.error(e),
}
}
self.build_signatures(items);
if !loaded_modules.is_empty() {
self.check_loaded_module_bodies(&loaded_modules);
}
self.check_body(items);
}
/// Type-check `items` against a caller-supplied list of already
/// loaded dependency modules (skips disk IO). Used by the
/// playground so multi-file projects stored in an in-browser map
/// type-check without touching a filesystem.
pub(super) fn check_with_loaded(
&mut self,
items: &[TopLevel],
loaded: &[crate::source::LoadedModule],
) {
// Iron — A3: dependency aliases come in before local
// signatures so `build_signatures`'s canonicalization sees
// imported types (e.g. `Tile` resolves to `Types.Tile` when
// `Types` is in `depends`).
self.integrate_loaded_modules(loaded);
self.build_signatures(items);
self.check_loaded_module_bodies(loaded);
self.check_body(items);
}
fn integrate_loaded_modules(&mut self, modules: &[crate::source::LoadedModule]) {
let pairs: Vec<_> = modules
.iter()
.map(|m| (m.dep_name.clone(), m.items.clone()))
.collect();
let registry = crate::visibility::SymbolRegistry::from_modules(&pairs);
if let Err(e) = self.integrate_registry(®istry) {
self.error(e);
}
}
/// Visit every function body in each loaded dependency module so the
/// per-`Spanned<Expr>` type slot gets populated. Without this, the
/// downstream codegen consumers (Step 2 legacy WASM, Step 1 Rust,
/// future wasm-gc) would see `Spanned::ty() == None` for everything in
/// dependent modules — which used to be patched over by per-backend
/// ad-hoc inference; the typed pipeline closes that gap properly.
///
/// Each module gets its own short-lived `TypeChecker` so unqualified
/// references inside the module resolve against that module's own
/// signatures (the parent checker only sees the qualified canonical
/// names from `integrate_loaded_modules`). `Spanned::set_ty` writes
/// straight to the shared AST node, so the type stamps survive the
/// sub-checker dropping. Diagnostics from the sub-check are folded
/// back into the parent so a real type bug in `combat.av` still
/// surfaces alongside any error in `main.av`.
fn check_loaded_module_bodies(&mut self, modules: &[crate::source::LoadedModule]) {
for (idx, module) in modules.iter().enumerate() {
let mut sub = TypeChecker::new();
// Propagate self-host opaque bypass into the dep module sub-
// checker. `domain/builtins.av` round-trips `Tcp.Connection`
// through the replay `Val` shape; without this, the sub-checker
// re-enforces opacity even when the parent compile was kicked
// off with `--with-self-host-support`.
sub.self_host_mode = self.self_host_mode;
// Iron — A3: pull in dependency aliases BEFORE building
// local signatures. build_signatures canonicalizes every
// type annotation by walking `sig_aliases`; without the
// imported types in there first, a bare reference like
// `Tile` (imported from `Types`) stays as
// `Type::Named("Tile")` instead of being rewritten to
// `Type::Named("Types.Tile")`, and the strict matcher
// then rejects the call site that passes the canonical
// form.
let others: Vec<_> = modules
.iter()
.enumerate()
.filter(|(i, _)| *i != idx)
.map(|(_, m)| m.clone())
.collect();
sub.integrate_loaded_modules(&others);
sub.build_signatures(&module.items);
sub.check_top_level_stmts(&module.items);
sub.check_verify_blocks(&module.items);
for item in &module.items {
if let TopLevel::FnDef(f) = item {
sub.check_fn(f);
}
}
self.errors.append(&mut sub.errors);
}
}
fn check_body(&mut self, items: &[TopLevel]) {
self.check_top_level_stmts(items);
self.check_verify_blocks(items);
for item in items {
if let TopLevel::FnDef(f) = item {
self.check_fn(f);
}
}
}
// ── Memo-safety analysis ─────────────────────────────────────────────
/// A type is memo-safe if its runtime values can be cheaply hashed and
/// compared for equality (scalars, records/variants of scalars).
pub(super) fn is_memo_safe(&self, ty: &Type, visiting: &mut HashSet<String>) -> bool {
match ty {
// String stays excluded for now: memo keys hash String content,
// so string-heavy recursion can degrade to O(n) keying work.
Type::Int | Type::Float | Type::Bool | Type::Unit => true,
Type::Str => false,
Type::Tuple(items) => items.iter().all(|item| self.is_memo_safe(item, visiting)),
Type::List(_)
| Type::Vector(_)
| Type::Map(_, _)
| Type::Fn(_, _, _)
| Type::Invalid
| Type::Var(_) => false,
Type::Result(_, _) | Type::Option(_) => false,
Type::Named(name) => {
// Prevent infinite recursion for cyclic type defs
if !visiting.insert(name.clone()) {
return true;
}
let safe = self.named_type_memo_safe(name, visiting);
visiting.remove(name);
safe
}
}
}
/// Check whether a named user-defined type has only memo-safe fields.
pub(super) fn named_type_memo_safe(&self, name: &str, visiting: &mut HashSet<String>) -> bool {
// Iron — A5: `fields_for_type` resolves `name` through
// `sig_aliases` and returns one `(field_name, field_type)`
// per declared field; no dual-key arithmetic.
let fields = self.fields_for_type(name);
if !fields.is_empty() {
for (_, field_ty) in fields {
if !self.is_memo_safe(&field_ty, visiting) {
return false;
}
}
return true;
}
// Check sum type variants: constructors are registered in fn_sigs
// as "TypeName.VariantName" with param types, or in value_members
// for zero-arg constructors.
let prefix = format!("{}.", name);
let mut found_variants = false;
for (key, sig) in &self.fn_sigs {
if key.starts_with(&prefix) && key.len() > prefix.len() {
found_variants = true;
for param in &sig.params {
if !self.is_memo_safe(param, visiting) {
return false;
}
}
}
}
for key in self.value_members.keys() {
if key.starts_with(&prefix) && key.len() > prefix.len() {
found_variants = true;
// Zero-arg constructors carry no data — always safe
}
}
if found_variants {
return true;
}
// Unknown named type — conservatively not safe
false
}
/// Compute the set of user-defined type names that are memo-safe.
pub(super) fn compute_memo_safe_types(&self, items: &[TopLevel]) -> HashSet<String> {
let mut safe = HashSet::new();
for item in items {
if let TopLevel::TypeDef(td) = item {
let name = match td {
TypeDef::Sum { name, .. } | TypeDef::Product { name, .. } => name,
};
let mut visiting = HashSet::new();
if self.is_memo_safe(&Type::Named(name.clone()), &mut visiting) {
safe.insert(name.clone());
}
}
}
safe
}
}