602 lines
22 KiB
Rust
602 lines
22 KiB
Rust
#![allow(clippy::enum_variant_names)]
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use std::{
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collections::{hash_map::Entry, HashMap, HashSet},
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fmt,
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rc::Rc,
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str::FromStr,
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};
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use crate::{
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ast,
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ast::{
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Declaration, Expression, ExpressionKind, ItemId, ModuleSpecifier, Statement, StatementKind, TypeBody,
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TypeSingletonName, Variant, VariantKind,
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},
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builtin::Builtin,
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tokenizing::Location,
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type_inference::{self, PendingType, TypeBuilder, TypeContext, TypeId, VariantBuilder},
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};
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mod resolver;
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mod symbol_trie;
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use symbol_trie::SymbolTrie;
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mod test;
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use crate::identifier::{define_id_kind, Id, IdStore};
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define_id_kind!(DefItem);
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pub type DefId = Id<DefItem>;
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/// Fully-qualified symbol name
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#[derive(Debug, Clone, Eq, PartialEq, Hash, PartialOrd, Ord)]
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pub struct Fqsn {
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//TODO Fqsn's need to be cheaply cloneable
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scopes: Vec<ScopeSegment>,
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}
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impl Fqsn {
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fn from_scope_stack(scopes: &[ScopeSegment], new_name: Rc<String>) -> Self {
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let mut v = Vec::new();
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for s in scopes {
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v.push(s.clone());
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}
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v.push(ScopeSegment::Name(new_name));
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Fqsn { scopes: v }
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}
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#[allow(dead_code)]
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fn from_strs(strs: &[&str]) -> Fqsn {
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let mut scopes = vec![];
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for s in strs {
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scopes.push(ScopeSegment::Name(Rc::new(s.to_string())));
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}
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Fqsn { scopes }
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}
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fn last_elem(&self) -> Rc<String> {
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let ScopeSegment::Name(name) = self.scopes.last().unwrap();
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name.clone()
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}
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}
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impl fmt::Display for Fqsn {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let delim = "::";
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let Fqsn { scopes } = self;
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write!(f, "FQSN<{}", scopes[0])?;
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for item in scopes[1..].iter() {
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write!(f, "{}{}", delim, item)?;
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}
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write!(f, ">")
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}
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}
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//TODO eventually this should use ItemId's to avoid String-cloning
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/// One segment within a scope.
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#[derive(Debug, Clone, Eq, PartialEq, Hash, PartialOrd, Ord)]
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enum ScopeSegment {
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Name(Rc<String>),
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}
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impl fmt::Display for ScopeSegment {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let ScopeSegment::Name(name) = self;
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write!(f, "{}", name)
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}
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}
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#[allow(dead_code)]
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#[derive(Debug, Clone)]
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pub enum SymbolError {
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DuplicateName { prev_name: Fqsn, location: Location },
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DuplicateVariant { type_fqsn: Fqsn, name: String },
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DuplicateRecord { type_name: Fqsn, location: Location, member: String },
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UnknownAnnotation { name: String },
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BadAnnotation { name: String, msg: String },
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}
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#[allow(dead_code)]
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#[derive(Debug)]
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struct NameSpec<K> {
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location: Location,
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kind: K,
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}
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#[derive(Debug)]
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enum NameKind {
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Module,
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Function,
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Binding,
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}
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#[derive(Debug)]
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struct TypeKind;
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/// Keeps track of what names were used in a given namespace.
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struct NameTable<K> {
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table: HashMap<Fqsn, NameSpec<K>>,
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}
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impl<K> NameTable<K> {
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fn new() -> Self {
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Self { table: HashMap::new() }
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}
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fn register(&mut self, name: Fqsn, spec: NameSpec<K>) -> Result<(), SymbolError> {
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match self.table.entry(name.clone()) {
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Entry::Occupied(o) =>
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Err(SymbolError::DuplicateName { prev_name: name, location: o.get().location }),
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Entry::Vacant(v) => {
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v.insert(spec);
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Ok(())
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}
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}
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}
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}
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//cf. p. 150 or so of Language Implementation Patterns
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pub struct SymbolTable {
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def_id_store: IdStore<DefItem>,
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/// Used for import resolution.
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symbol_trie: SymbolTrie,
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/// These tables are responsible for preventing duplicate names.
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fq_names: NameTable<NameKind>, //Note that presence of two tables implies that a type and other binding with the same name can co-exist
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types: NameTable<TypeKind>,
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id_to_def: HashMap<ItemId, DefId>,
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def_to_symbol: HashMap<DefId, Rc<Symbol>>,
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}
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impl SymbolTable {
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pub fn new() -> SymbolTable {
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let mut table = SymbolTable {
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def_id_store: IdStore::new(),
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symbol_trie: SymbolTrie::new(),
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fq_names: NameTable::new(),
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types: NameTable::new(),
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id_to_def: HashMap::new(),
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def_to_symbol: HashMap::new(),
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};
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table.populate_builtins();
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table
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}
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/// The main entry point into the symbol table. This will traverse the AST in several
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/// different ways and populate subtables with information that will be used further in the
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/// compilation process.
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pub fn process_ast(
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&mut self,
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ast: &ast::AST,
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type_context: &mut TypeContext,
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) -> Result<(), Vec<SymbolError>> {
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let mut runner = SymbolTableRunner { type_context, table: self };
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let errs = runner.populate_name_tables(ast);
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if !errs.is_empty() {
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return Err(errs);
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}
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runner.resolve_scopes(ast);
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Ok(())
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}
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pub fn lookup_symbol(&self, id: &ItemId) -> Option<&Symbol> {
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let def = self.id_to_def.get(id)?;
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self.def_to_symbol.get(def).map(|s| s.as_ref())
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}
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pub fn lookup_symbol_by_def(&self, def: &DefId) -> Option<&Symbol> {
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self.def_to_symbol.get(def).map(|s| s.as_ref())
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}
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#[allow(dead_code)]
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pub fn debug(&self) {
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println!("Symbol table:");
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println!("----------------");
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for (id, def) in self.id_to_def.iter() {
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if let Some(symbol) = self.def_to_symbol.get(def) {
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println!("{} => {}: {}", id, def, symbol);
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} else {
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println!("{} => {} <NO SYMBOL FOUND>", id, def);
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}
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}
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}
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/// Register a new mapping of a fully-qualified symbol name (e.g. `Option::Some`)
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/// to a Symbol, a descriptor of what that name refers to.
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fn add_symbol(&mut self, id: &ItemId, fqsn: Fqsn, spec: SymbolSpec) {
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let def_id = self.def_id_store.fresh();
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let symbol = Rc::new(Symbol { fully_qualified_name: fqsn.clone(), spec, def_id });
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self.symbol_trie.insert(&fqsn, def_id);
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self.id_to_def.insert(*id, def_id);
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self.def_to_symbol.insert(def_id, symbol);
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}
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fn populate_single_builtin(&mut self, fqsn: Fqsn, builtin: Builtin) {
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let def_id = self.def_id_store.fresh();
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let spec = SymbolSpec::Builtin(builtin);
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let symbol = Rc::new(Symbol { fully_qualified_name: fqsn.clone(), spec, def_id });
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self.symbol_trie.insert(&fqsn, def_id);
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self.def_to_symbol.insert(def_id, symbol);
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}
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fn populate_builtins(&mut self) {
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/*
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let fqsn = Fqsn::from_strs(&["println"]);
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self.populate_single_builtin(fqsn, Builtin::IOPrintLn);
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let fqsn = Fqsn::from_strs(&["print"]);
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self.populate_single_builtin(fqsn, Builtin::IOPrint);
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*/
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}
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}
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struct SymbolTableRunner<'a> {
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type_context: &'a mut TypeContext,
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table: &'a mut SymbolTable,
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}
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#[allow(dead_code)]
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#[derive(Debug, Clone)]
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pub struct Symbol {
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fully_qualified_name: Fqsn,
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spec: SymbolSpec,
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def_id: DefId,
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}
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impl Symbol {
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pub fn local_name(&self) -> Rc<String> {
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self.fully_qualified_name.last_elem()
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}
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pub fn def_id(&self) -> Option<DefId> {
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Some(self.def_id)
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}
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pub fn spec(&self) -> SymbolSpec {
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self.spec.clone()
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}
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}
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impl fmt::Display for Symbol {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "<Local name: {}, {}, Spec: {}>", self.local_name(), self.fully_qualified_name, self.spec)
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}
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}
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//TODO - I think I eventually want to draw a distinction between true global items
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//i.e. global vars, and items whose definitions are scoped. Right now there's a sense
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//in which Func, DataConstructor, RecordConstructor, and GlobalBinding are "globals",
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//whereas LocalVarible and FunctionParam have local scope. But right now, they all
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//get put into a common table, and all get DefId's from a common source.
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//
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//It would be good if individual functions could in parallel look up their own
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//local vars without interfering with other lookups. Also some type definitions
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//should be scoped in a similar way.
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//
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//Also it makes sense that non-globals should not use DefId's, particularly not
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//function parameters (even though they are currently assigned).
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#[derive(Debug, Clone)]
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pub enum SymbolSpec {
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Builtin(Builtin),
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Func,
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DataConstructor { tag: u32, type_id: TypeId },
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RecordConstructor { tag: u32, type_id: TypeId },
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GlobalBinding, //Only for global variables, not for function-local ones or ones within a `let` scope context
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LocalVariable,
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FunctionParam(u8),
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}
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impl fmt::Display for SymbolSpec {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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use self::SymbolSpec::*;
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match self {
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Builtin(b) => write!(f, "Builtin: {:?}", b),
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Func => write!(f, "Func"),
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DataConstructor { tag, type_id } => write!(f, "DataConstructor(tag: {}, type: {})", tag, type_id),
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RecordConstructor { type_id, tag, .. } =>
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write!(f, "RecordConstructor(tag: {})(<members> -> {})", tag, type_id),
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GlobalBinding => write!(f, "GlobalBinding"),
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LocalVariable => write!(f, "Local variable"),
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FunctionParam(n) => write!(f, "Function param: {}", n),
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}
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}
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}
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impl<'a> SymbolTableRunner<'a> {
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/* note: this adds names for *forward reference* but doesn't actually create any types. solve that problem
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* later */
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fn add_symbol(&mut self, id: &ItemId, fqsn: Fqsn, spec: SymbolSpec) {
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self.table.add_symbol(id, fqsn, spec)
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}
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/// Walks the AST, matching the ID of an identifier used in some expression to
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/// the corresponding Symbol.
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fn resolve_scopes(&mut self, ast: &ast::AST) {
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let mut resolver = resolver::ScopeResolver::new(self.table);
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resolver.resolve(ast);
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}
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/// This function traverses the AST and adds symbol table entries for
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/// constants, functions, types, and modules defined within. This simultaneously
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/// checks for dupicate definitions (and returns errors if discovered), and sets
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/// up name tables that will be used by further parts of the compiler
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fn populate_name_tables(&mut self, ast: &ast::AST) -> Vec<SymbolError> {
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let mut scope_stack = vec![];
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self.add_from_scope(ast.statements.as_ref(), &mut scope_stack, false)
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}
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fn add_from_scope(
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&mut self,
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statements: &[Statement],
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scope_stack: &mut Vec<ScopeSegment>,
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function_scope: bool,
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) -> Vec<SymbolError> {
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let mut errors = vec![];
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for statement in statements {
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let Statement { id, kind, location } = statement;
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let location = *location;
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if let Err(err) = self.add_single_statement(id, kind, location, scope_stack, function_scope) {
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errors.push(err);
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} else {
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// If there's an error with a name, don't recurse into subscopes of that name
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let recursive_errs = match kind {
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StatementKind::Declaration(Declaration::FuncDecl(signature, body)) => {
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let new_scope = ScopeSegment::Name(signature.name.clone());
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scope_stack.push(new_scope);
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let output = self.add_from_scope(body.as_ref(), scope_stack, true);
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scope_stack.pop();
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output
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}
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StatementKind::Module(ModuleSpecifier { name, contents }) => {
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let new_scope = ScopeSegment::Name(name.clone());
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scope_stack.push(new_scope);
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let output = self.add_from_scope(contents.as_ref(), scope_stack, false);
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scope_stack.pop();
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output
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}
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StatementKind::Declaration(Declaration::TypeDecl { name, body, mutable }) =>
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self.add_type_members(name, body, mutable, location, scope_stack),
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_ => vec![],
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};
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errors.extend(recursive_errs.into_iter());
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}
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}
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errors
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}
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fn add_single_statement(
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&mut self,
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id: &ItemId,
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kind: &StatementKind,
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location: Location,
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scope_stack: &[ScopeSegment],
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function_scope: bool,
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) -> Result<(), SymbolError> {
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match kind {
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StatementKind::Declaration(Declaration::FuncSig(signature)) => {
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let fq_function = Fqsn::from_scope_stack(scope_stack, signature.name.clone());
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self.table
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.fq_names
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.register(fq_function.clone(), NameSpec { location, kind: NameKind::Function })?;
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self.table.types.register(fq_function.clone(), NameSpec { location, kind: TypeKind })?;
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self.add_symbol(id, fq_function, SymbolSpec::Func);
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}
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StatementKind::Declaration(Declaration::FuncDecl(signature, ..)) => {
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let fn_name = &signature.name;
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let fq_function = Fqsn::from_scope_stack(scope_stack, fn_name.clone());
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self.table
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.fq_names
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.register(fq_function.clone(), NameSpec { location, kind: NameKind::Function })?;
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self.table.types.register(fq_function.clone(), NameSpec { location, kind: TypeKind })?;
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self.add_symbol(id, fq_function, SymbolSpec::Func);
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}
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StatementKind::Declaration(Declaration::TypeDecl { name, .. }) => {
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let fq_type = Fqsn::from_scope_stack(scope_stack, name.name.clone());
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self.table.types.register(fq_type, NameSpec { location, kind: TypeKind })?;
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}
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StatementKind::Declaration(Declaration::Binding { name, .. }) => {
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let fq_binding = Fqsn::from_scope_stack(scope_stack, name.clone());
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self.table
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.fq_names
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.register(fq_binding.clone(), NameSpec { location, kind: NameKind::Binding })?;
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if !function_scope {
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self.add_symbol(id, fq_binding, SymbolSpec::GlobalBinding);
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}
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}
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StatementKind::Module(ModuleSpecifier { name, .. }) => {
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let fq_module = Fqsn::from_scope_stack(scope_stack, name.clone());
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self.table.fq_names.register(fq_module, NameSpec { location, kind: NameKind::Module })?;
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}
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StatementKind::Declaration(Declaration::Annotation { name, arguments, inner }) => {
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let inner = inner.as_ref();
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self.add_single_statement(
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&inner.id,
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&inner.kind,
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inner.location,
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scope_stack,
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function_scope,
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)?;
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self.process_annotation(name.as_ref(), arguments.as_slice(), scope_stack, inner)?;
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}
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_ => (),
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}
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Ok(())
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}
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fn process_annotation(
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&mut self,
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name: &str,
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arguments: &[Expression],
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scope_stack: &[ScopeSegment],
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inner: &Statement,
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) -> Result<(), SymbolError> {
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println!("handling annotation: {}", name);
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if name == "register_builtin" {
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if let Statement {
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id: _,
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location: _,
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kind: StatementKind::Declaration(Declaration::FuncDecl(sig, _)),
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} = inner
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{
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let fqsn = Fqsn::from_scope_stack(scope_stack, sig.name.clone());
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let builtin_name = match arguments {
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[Expression { kind: ExpressionKind::Value(qname), .. }]
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if qname.components.len() == 1 =>
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qname.components[0].clone(),
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_ =>
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return Err(SymbolError::BadAnnotation {
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name: name.to_string(),
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msg: "Bad argument for register_builtin".to_string(),
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}),
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};
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let builtin =
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Builtin::from_str(builtin_name.as_str()).map_err(|_| SymbolError::BadAnnotation {
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name: name.to_string(),
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msg: format!("Invalid builtin: {}", builtin_name),
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})?;
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self.table.populate_single_builtin(fqsn, builtin);
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Ok(())
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} else {
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Err(SymbolError::BadAnnotation {
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name: name.to_string(),
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msg: "register_builtin not annotating a function".to_string(),
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})
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}
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} else {
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Err(SymbolError::UnknownAnnotation { name: name.to_string() })
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}
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}
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fn add_type_members(
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&mut self,
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type_name: &TypeSingletonName,
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type_body: &TypeBody,
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_mutable: &bool,
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location: Location,
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scope_stack: &mut Vec<ScopeSegment>,
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) -> Vec<SymbolError> {
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let (variants, immediate_variant) = match type_body {
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TypeBody::Variants(variants) => (variants.clone(), false),
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TypeBody::ImmediateRecord(id, fields) => (
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vec![Variant {
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id: *id,
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name: type_name.name.clone(),
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kind: VariantKind::Record(fields.clone()),
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}],
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true,
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),
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};
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let type_fqsn = Fqsn::from_scope_stack(scope_stack, type_name.name.clone());
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|
|
|
let new_scope = ScopeSegment::Name(type_name.name.clone());
|
|
scope_stack.push(new_scope);
|
|
|
|
// Check for duplicates before registering any types with the TypeContext
|
|
let mut seen_variants = HashSet::new();
|
|
let mut errors = vec![];
|
|
|
|
for variant in variants.iter() {
|
|
if seen_variants.contains(&variant.name) {
|
|
errors.push(SymbolError::DuplicateVariant {
|
|
type_fqsn: type_fqsn.clone(),
|
|
name: variant.name.as_ref().to_string(),
|
|
})
|
|
}
|
|
seen_variants.insert(variant.name.clone());
|
|
|
|
if let VariantKind::Record(ref members) = variant.kind {
|
|
let variant_name = Fqsn::from_scope_stack(scope_stack.as_ref(), variant.name.clone());
|
|
let mut seen_members = HashMap::new();
|
|
for (member_name, _) in members.iter() {
|
|
match seen_members.entry(member_name.as_ref()) {
|
|
Entry::Occupied(o) => {
|
|
let location = *o.get();
|
|
errors.push(SymbolError::DuplicateRecord {
|
|
type_name: variant_name.clone(),
|
|
location,
|
|
member: member_name.as_ref().to_string(),
|
|
});
|
|
}
|
|
//TODO eventually this should track meaningful locations
|
|
Entry::Vacant(v) => {
|
|
v.insert(location);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if !errors.is_empty() {
|
|
return errors;
|
|
}
|
|
|
|
let mut type_builder = TypeBuilder::new(type_name.name.as_ref());
|
|
|
|
let mut fqsn_id_map = HashMap::new();
|
|
for variant in variants.iter() {
|
|
let Variant { name, kind, id } = variant;
|
|
|
|
fqsn_id_map.insert(Fqsn::from_scope_stack(scope_stack.as_ref(), name.clone()), id);
|
|
|
|
let mut variant_builder = VariantBuilder::new(name.as_ref());
|
|
match kind {
|
|
VariantKind::UnitStruct => (),
|
|
VariantKind::TupleStruct(items) =>
|
|
for type_identifier in items {
|
|
let pending: PendingType = type_identifier.into();
|
|
variant_builder.add_member(pending);
|
|
},
|
|
VariantKind::Record(members) =>
|
|
for (field_name, type_identifier) in members.iter() {
|
|
let pending: PendingType = type_identifier.into();
|
|
variant_builder.add_record_member(field_name.as_ref(), pending);
|
|
},
|
|
}
|
|
type_builder.add_variant(variant_builder);
|
|
}
|
|
|
|
let type_id = self.type_context.register_type(type_builder);
|
|
let type_definition = self.type_context.lookup_type(&type_id).unwrap();
|
|
|
|
// This index is guaranteed to be the correct tag
|
|
for (index, variant) in type_definition.variants.iter().enumerate() {
|
|
let fqsn = Fqsn::from_scope_stack(scope_stack.as_ref(), Rc::new(variant.name.to_string()));
|
|
let id = fqsn_id_map.get(&fqsn).unwrap();
|
|
let tag = index as u32;
|
|
let spec = match &variant.members {
|
|
type_inference::VariantMembers::Unit => SymbolSpec::DataConstructor { tag, type_id },
|
|
type_inference::VariantMembers::Tuple(..) => SymbolSpec::DataConstructor { tag, type_id },
|
|
type_inference::VariantMembers::Record(..) => SymbolSpec::RecordConstructor { tag, type_id },
|
|
};
|
|
self.table.add_symbol(id, fqsn, spec);
|
|
}
|
|
|
|
if immediate_variant {
|
|
let variant = &type_definition.variants[0];
|
|
let fqsn = Fqsn::from_scope_stack(scope_stack.as_ref(), Rc::new(variant.name.to_string()));
|
|
let id = fqsn_id_map.get(&fqsn).unwrap();
|
|
let abbrev_fqsn = Fqsn::from_scope_stack(
|
|
scope_stack[0..scope_stack.len() - 1].as_ref(),
|
|
Rc::new(variant.name.to_string()),
|
|
);
|
|
let spec = SymbolSpec::RecordConstructor { tag: 0, type_id };
|
|
self.table.add_symbol(id, abbrev_fqsn, spec);
|
|
}
|
|
|
|
scope_stack.pop();
|
|
vec![]
|
|
}
|
|
}
|