feat: add prelude.nr

compiler/noirc_frontend/src/hir/def_collector/dc_crate.rs

@@ -7,8 +7,8 @@ use crate::hir::resolution::errors::ResolverError;
 use crate::hir::resolution::import::{resolve_imports, ImportDirective};
 use crate::hir::resolution::resolver::Resolver;
 use crate::hir::resolution::{
-    collect_impls, collect_trait_impls, resolve_free_functions, resolve_globals, resolve_impls,
-    resolve_structs, resolve_trait_by_path, resolve_trait_impls, resolve_traits,
+    collect_impls, collect_trait_impls, path_resolver, resolve_free_functions, resolve_globals,
+    resolve_impls, resolve_structs, resolve_trait_by_path, resolve_trait_impls, resolve_traits,
     resolve_type_aliases,
 };
 use crate::hir::type_check::{type_check_func, TypeCheckError, TypeChecker};
@@ -19,8 +19,9 @@ use crate::node_interner::{FuncId, NodeInterner, StmtId, StructId, TraitId, Type
 
 use crate::parser::{ParserError, SortedModule};
 use crate::{
-    ExpressionKind, LetStatement, Literal, NoirFunction, NoirStruct, NoirTrait, NoirTypeAlias,
-    Path, Type, UnresolvedGenerics, UnresolvedTraitConstraint, UnresolvedType,
+    ExpressionKind, Ident, LetStatement, Literal, NoirFunction, NoirStruct, NoirTrait,
+    NoirTypeAlias, Path, PathKind, Type, UnresolvedGenerics, UnresolvedTraitConstraint,
+    UnresolvedType,
 };
 use fm::FileId;
 use iter_extended::vecmap;
@@ -243,9 +244,20 @@ impl DefCollector {
             context,
         ));
 
+        let submodules = vecmap(def_collector.def_map.modules().iter(), |(index, _)| index);
         // Add the current crate to the collection of DefMaps
         context.def_maps.insert(crate_id, def_collector.def_map);
 
+        inject_prelude(crate_id, context, crate_root, &mut def_collector.collected_imports);
+        for submodule in submodules {
+            inject_prelude(
+                crate_id,
+                context,
+                LocalModuleId(submodule),
+                &mut def_collector.collected_imports,
+            );
+        }
+
         // Resolve unresolved imports collected from the crate
         let (resolved, unresolved_imports) =
             resolve_imports(crate_id, def_collector.collected_imports, &context.def_maps);
@@ -264,8 +276,11 @@ impl DefCollector {
         for resolved_import in resolved {
             let name = resolved_import.name;
             for ns in resolved_import.resolved_namespace.iter_defs() {
-                let result = current_def_map.modules[resolved_import.module_scope.0]
-                    .import(name.clone(), ns);
+                let result = current_def_map.modules[resolved_import.module_scope.0].import(
+                    name.clone(),
+                    ns,
+                    resolved_import.is_prelude,
+                );
 
                 if let Err((first_def, second_def)) = result {
                     let err = DefCollectorErrorKind::Duplicate {
@@ -358,6 +373,47 @@ impl DefCollector {
     }
 }
 
+fn inject_prelude(
+    crate_id: CrateId,
+    context: &Context,
+    crate_root: LocalModuleId,
+    collected_imports: &mut Vec<ImportDirective>,
+) {
+    let segments: Vec<_> = "std::prelude"
+        .split("::")
+        .map(|segment| crate::Ident::new(segment.into(), Span::default()))
+        .collect();
+
+    let path =
+        Path { segments: segments.clone(), kind: crate::PathKind::Dep, span: Span::default() };
+
+    if !crate_id.is_stdlib() {
+        if let Ok(module_def) = path_resolver::resolve_path(
+            &context.def_maps,
+            ModuleId { krate: crate_id, local_id: crate_root },
+            path,
+        ) {
+            let module_id = module_def.as_module().expect("std::prelude is module");
+            let prelude = context.module(module_id).scope().names();
+
+            for path in prelude {
+                let mut segments = segments.clone();
+                segments.push(Ident::new(path.to_string(), Span::default()));
+
+                collected_imports.insert(
+                    0,
+                    ImportDirective {
+                        module_id: crate_root,
+                        path: Path { segments, kind: PathKind::Dep, span: Span::default() },
+                        alias: None,
+                        is_prelude: true,
+                    },
+                );
+            }
+        }
+    }
+}
+
 /// Separate the globals Vec into two. The first element in the tuple will be the
 /// literal globals, except for arrays, and the second will be all other globals.
 /// We exclude array literals as they can contain complex types

compiler/noirc_frontend/src/hir/def_collector/dc_mod.rs

@@ -44,6 +44,7 @@ pub fn collect_defs(
 ) -> Vec<(CompilationError, FileId)> {
     let mut collector = ModCollector { def_collector, file_id, module_id };
     let mut errors: Vec<(CompilationError, FileId)> = vec![];
+
     // First resolve the module declarations
     for decl in ast.module_decls {
         errors.extend(collector.parse_module_declaration(context, &decl, crate_id));
@@ -57,6 +58,7 @@ pub fn collect_defs(
             module_id: collector.module_id,
             path: import.path,
             alias: import.alias,
+            is_prelude: false,
         });
     }
 

compiler/noirc_frontend/src/hir/def_map/item_scope.rs

@@ -5,15 +5,17 @@ use crate::{
 };
 use std::collections::{hash_map::Entry, HashMap};
 
+type Scope = HashMap<Option<TraitId>, (ModuleDefId, Visibility, bool /*is_prelude*/)>;
+
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
 pub enum Visibility {
     Public,
 }
 
 #[derive(Default, Debug, PartialEq, Eq)]
 pub struct ItemScope {
-    types: HashMap<Ident, HashMap<Option<TraitId>, (ModuleDefId, Visibility)>>,
-    values: HashMap<Ident, HashMap<Option<TraitId>, (ModuleDefId, Visibility)>>,
+    types: HashMap<Ident, Scope>,
+    values: HashMap<Ident, Scope>,
 
     defs: Vec<ModuleDefId>,
 }
@@ -25,7 +27,7 @@ impl ItemScope {
         mod_def: ModuleDefId,
         trait_id: Option<TraitId>,
     ) -> Result<(), (Ident, Ident)> {
-        self.add_item_to_namespace(name, mod_def, trait_id)?;
+        self.add_item_to_namespace(name, mod_def, trait_id, false)?;
         self.defs.push(mod_def);
         Ok(())
     }
@@ -38,25 +40,31 @@ impl ItemScope {
         name: Ident,
         mod_def: ModuleDefId,
         trait_id: Option<TraitId>,
+        is_prelude: bool,
     ) -> Result<(), (Ident, Ident)> {
-        let add_item =
-            |map: &mut HashMap<Ident, HashMap<Option<TraitId>, (ModuleDefId, Visibility)>>| {
-                if let Entry::Occupied(mut o) = map.entry(name.clone()) {
-                    let trait_hashmap = o.get_mut();
-                    if let Entry::Occupied(_) = trait_hashmap.entry(trait_id) {
-                        let old_ident = o.key();
-                        Err((old_ident.clone(), name))
-                    } else {
-                        trait_hashmap.insert(trait_id, (mod_def, Visibility::Public));
+        let add_item = |map: &mut HashMap<Ident, Scope>| {
+            if let Entry::Occupied(mut o) = map.entry(name.clone()) {
+                let trait_hashmap = o.get_mut();
+                if let Entry::Occupied(mut n) = trait_hashmap.entry(trait_id) {
+                    let is_prelude = std::mem::replace(&mut n.get_mut().2, is_prelude);
+                    let old_ident = o.key();
+
+                    if is_prelude {
                         Ok(())
+                    } else {
+                        Err((old_ident.clone(), name))
                     }
                 } else {
-                    let mut trait_hashmap = HashMap::new();
-                    trait_hashmap.insert(trait_id, (mod_def, Visibility::Public));
-                    map.insert(name, trait_hashmap);
+                    trait_hashmap.insert(trait_id, (mod_def, Visibility::Public, is_prelude));
                     Ok(())
                 }
-            };
+            } else {
+                let mut trait_hashmap = HashMap::new();
+                trait_hashmap.insert(trait_id, (mod_def, Visibility::Public, is_prelude));
+                map.insert(name, trait_hashmap);
+                Ok(())
+            }
+        };
 
         match mod_def {
             ModuleDefId::ModuleId(_) => add_item(&mut self.types),
@@ -69,7 +77,7 @@ impl ItemScope {
     }
 
     pub fn find_module_with_name(&self, mod_name: &Ident) -> Option<&ModuleId> {
-        let (module_def, _) = self.types.get(mod_name)?.get(&None)?;
+        let (module_def, _, _) = self.types.get(mod_name)?.get(&None)?;
         match module_def {
             ModuleDefId::ModuleId(id) => Some(id),
             _ => None,
@@ -81,13 +89,13 @@ impl ItemScope {
         // methods introduced without trait take priority and hide methods with the same name that come from a trait
         let a = trait_hashmap.get(&None);
         match a {
-            Some((module_def, _)) => match module_def {
+            Some((module_def, _, _)) => match module_def {
                 ModuleDefId::FunctionId(id) => Some(*id),
                 _ => None,
             },
             None => {
                 if trait_hashmap.len() == 1 {
-                    let (module_def, _) = trait_hashmap.get(trait_hashmap.keys().last()?)?;
+                    let (module_def, _, _) = trait_hashmap.get(trait_hashmap.keys().last()?)?;
                     match module_def {
                         ModuleDefId::FunctionId(id) => Some(*id),
                         _ => None,
@@ -105,7 +113,7 @@ impl ItemScope {
         func_name: &Ident,
         trait_id: &Option<TraitId>,
     ) -> Option<FuncId> {
-        let (module_def, _) = self.values.get(func_name)?.get(trait_id)?;
+        let (module_def, _, _) = self.values.get(func_name)?.get(trait_id)?;
         match module_def {
             ModuleDefId::FunctionId(id) => Some(*id),
             _ => None,
@@ -115,20 +123,19 @@ impl ItemScope {
     pub fn find_name(&self, name: &Ident) -> PerNs {
         // Names, not associated with traits are searched first. If not found, we search for name, coming from a trait.
         // If we find only one name from trait, we return it. If there are multiple traits, providing the same name, we return None.
-        let find_name_in =
-            |a: &HashMap<Ident, HashMap<Option<TraitId>, (ModuleDefId, Visibility)>>| {
-                if let Some(t) = a.get(name) {
-                    if let Some(tt) = t.get(&None) {
-                        Some(*tt)
-                    } else if t.len() == 1 {
-                        t.values().last().cloned()
-                    } else {
-                        None
-                    }
+        let find_name_in = |a: &HashMap<Ident, Scope>| {
+            if let Some(t) = a.get(name) {
+                if let Some(tt) = t.get(&None) {
+                    Some(*tt)
+                } else if t.len() == 1 {
+                    t.values().last().cloned()
                 } else {
                     None
                 }
-            };
+            } else {
+                None
+            }
+        };
 
         PerNs { types: find_name_in(&self.types), values: find_name_in(&self.values) }
     }
@@ -144,15 +151,19 @@ impl ItemScope {
         }
     }
 
+    pub fn names(&self) -> impl Iterator<Item = &Ident> {
+        self.types.keys().chain(self.values.keys())
+    }
+
     pub fn definitions(&self) -> Vec<ModuleDefId> {
         self.defs.clone()
     }
 
-    pub fn types(&self) -> &HashMap<Ident, HashMap<Option<TraitId>, (ModuleDefId, Visibility)>> {
+    pub fn types(&self) -> &HashMap<Ident, Scope> {
         &self.types
     }
 
-    pub fn values(&self) -> &HashMap<Ident, HashMap<Option<TraitId>, (ModuleDefId, Visibility)>> {
+    pub fn values(&self) -> &HashMap<Ident, Scope> {
         &self.values
     }
 

compiler/noirc_frontend/src/hir/def_map/module_data.rs

@@ -41,6 +41,10 @@ impl ModuleData {
         }
     }
 
+    pub(crate) fn scope(&self) -> &ItemScope {
+        &self.scope
+    }
+
     fn declare(
         &mut self,
         name: Ident,
@@ -104,21 +108,26 @@ impl ModuleData {
         self.scope.find_func_with_name(name)
     }
 
-    pub fn import(&mut self, name: Ident, id: ModuleDefId) -> Result<(), (Ident, Ident)> {
-        self.scope.add_item_to_namespace(name, id, None)
+    pub fn import(
+        &mut self,
+        name: Ident,
+        id: ModuleDefId,
+        is_prelude: bool,
+    ) -> Result<(), (Ident, Ident)> {
+        self.scope.add_item_to_namespace(name, id, None, is_prelude)
     }
 
     pub fn find_name(&self, name: &Ident) -> PerNs {
         self.scope.find_name(name)
     }
 
     pub fn type_definitions(&self) -> impl Iterator<Item = ModuleDefId> + '_ {
-        self.definitions.types().values().flat_map(|a| a.values().map(|(id, _)| *id))
+        self.definitions.types().values().flat_map(|a| a.values().map(|(id, _, _)| *id))
     }
 
     /// Return an iterator over all definitions defined within this module,
     /// excluding any type definitions.
     pub fn value_definitions(&self) -> impl Iterator<Item = ModuleDefId> + '_ {
-        self.definitions.values().values().flat_map(|a| a.values().map(|(id, _)| *id))
+        self.definitions.values().values().flat_map(|a| a.values().map(|(id, _, _)| *id))
     }
 }

compiler/noirc_frontend/src/hir/def_map/module_def.rs

@@ -61,6 +61,13 @@ impl ModuleDefId {
             ModuleDefId::GlobalId(_) => "global",
         }
     }
+
+    pub fn as_module(&self) -> Option<ModuleId> {
+        match self {
+            Self::ModuleId(v) => Some(*v),
+            _ => None,
+        }
+    }
 }
 
 impl From<ModuleId> for ModuleDefId {

compiler/noirc_frontend/src/hir/def_map/namespace.rs

@@ -3,13 +3,13 @@ use super::{item_scope::Visibility, ModuleDefId};
 // This works exactly the same as in r-a, just simplified
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
 pub struct PerNs {
-    pub types: Option<(ModuleDefId, Visibility)>,
-    pub values: Option<(ModuleDefId, Visibility)>,
+    pub types: Option<(ModuleDefId, Visibility, bool)>,
+    pub values: Option<(ModuleDefId, Visibility, bool)>,
 }
 
 impl PerNs {
     pub fn types(t: ModuleDefId) -> PerNs {
-        PerNs { types: Some((t, Visibility::Public)), values: None }
+        PerNs { types: Some((t, Visibility::Public, false)), values: None }
     }
 
     pub fn take_types(self) -> Option<ModuleDefId> {
@@ -24,7 +24,7 @@ impl PerNs {
         self.types.map(|it| it.0).into_iter().chain(self.values.map(|it| it.0))
     }
 
-    pub fn iter_items(self) -> impl Iterator<Item = (ModuleDefId, Visibility)> {
+    pub fn iter_items(self) -> impl Iterator<Item = (ModuleDefId, Visibility, bool)> {
         self.types.into_iter().chain(self.values)
     }