feat: add some Module comptime functions

compiler/noirc_frontend/src/elaborator/mod.rs

@@ -623,6 +623,21 @@ impl<'context> Elaborator<'context> {
         }
     }
 
+    pub fn resolve_module_by_path(&self, path: Path) -> Option<ModuleId> {
+        let path_resolver = StandardPathResolver::new(self.module_id());
+
+        match path_resolver.resolve(self.def_maps, path.clone(), &mut None) {
+            Ok(PathResolution { module_def_id: ModuleDefId::ModuleId(module_id), error }) => {
+                if error.is_some() {
+                    None
+                } else {
+                    Some(module_id)
+                }
+            }
+            _ => None,
+        }
+    }
+
     fn resolve_trait_by_path(&mut self, path: Path) -> Option<TraitId> {
         let path_resolver = StandardPathResolver::new(self.module_id());
 
@@ -870,7 +885,11 @@ impl<'context> Elaborator<'context> {
     /// Since they should be within a child module, they should be elaborated as if
     /// `in_contract` is `false` so we can still resolve them in the parent module without them being in a contract.
     fn in_contract(&self) -> bool {
-        self.module_id().module(self.def_maps).is_contract
+        self.module_is_contract(self.module_id())
+    }
+
+    pub(crate) fn module_is_contract(&self, module_id: ModuleId) -> bool {
+        module_id.module(self.def_maps).is_contract
     }
 
     fn is_entry_point_function(&self, func: &NoirFunction, in_contract: bool) -> bool {
@@ -1069,6 +1088,11 @@ impl<'context> Elaborator<'context> {
         self.self_type = None;
     }
 
+    pub fn get_module(&self, module: ModuleId) -> &ModuleData {
+        let message = "A crate should always be present for a given crate id";
+        &self.def_maps.get(&module.krate).expect(message).modules[module.local_id.0]
+    }
+
     fn get_module_mut(def_maps: &mut DefMaps, module: ModuleId) -> &mut ModuleData {
         let message = "A crate should always be present for a given crate id";
         &mut def_maps.get_mut(&module.krate).expect(message).modules[module.local_id.0]

compiler/noirc_frontend/src/hir/comptime/interpreter/builtin.rs

@@ -6,8 +6,8 @@
 use acvm::{AcirField, FieldElement};
 use builtin_helpers::{
     check_argument_count, check_one_argument, check_three_arguments, check_two_arguments,
-    get_function_def, get_quoted, get_slice, get_trait_constraint, get_trait_def, get_type,
-    get_u32, hir_pattern_to_tokens,
+    get_function_def, get_module, get_quoted, get_slice, get_trait_constraint, get_trait_def,
+    get_type, get_u32, hir_pattern_to_tokens,
 };
 use chumsky::Parser;
 use iter_extended::{try_vecmap, vecmap};
@@ -17,7 +17,7 @@
 use crate::{
     ast::IntegerBitSize,
     hir::comptime::{errors::IResult, value::add_token_spans, InterpreterError, Value},
-    macros_api::{NodeInterner, Signedness},
+    macros_api::{ModuleDefId, NodeInterner, Signedness},
     parser,
     token::Token,
     QuotedType, Shared, Type,
@@ -40,13 +40,18 @@
             "array_len" => array_len(interner, arguments, location),
             "as_slice" => as_slice(interner, arguments, location),
             "is_unconstrained" => Ok(Value::Bool(true)),
+            "function_def_name" => function_def_name(interner, arguments, location),
             "function_def_parameters" => function_def_parameters(interner, arguments, location),
             "function_def_return_type" => function_def_return_type(interner, arguments, location),
+            "module_functions" => module_functions(self, arguments, location),
+            "module_is_contract" => module_is_contract(self, arguments, location),
+            "module_name" => module_name(interner, arguments, location),
             "modulus_be_bits" => modulus_be_bits(interner, arguments, location),
             "modulus_be_bytes" => modulus_be_bytes(interner, arguments, location),
             "modulus_le_bits" => modulus_le_bits(interner, arguments, location),
             "modulus_le_bytes" => modulus_le_bytes(interner, arguments, location),
             "modulus_num_bits" => modulus_num_bits(interner, arguments, location),
+            "quoted_as_module" => quoted_as_module(self, arguments, return_type, location),
             "quoted_as_trait_constraint" => quoted_as_trait_constraint(self, arguments, location),
             "quoted_as_type" => quoted_as_type(self, arguments, location),
             "quoted_eq" => quoted_eq(arguments, location),
@@ -307,6 +312,31 @@
     Ok(Value::Slice(values, typ))
 }
 
+// fn as_module(quoted: Quoted) -> Option<Module>
+fn quoted_as_module(
+    interpreter: &mut Interpreter,
+    arguments: Vec<(Value, Location)>,
+    return_type: Type,
+    location: Location,
+) -> IResult<Value> {
+    let argument = check_one_argument(arguments, location)?;
+
+    let tokens = get_quoted(argument, location)?;
+    let quoted = add_token_spans(tokens.clone(), location.span);
+
+    let option_value = parser::path_no_turbofish()
+        .parse(quoted)
+        .ok()
+        .and_then(|path| {
+            interpreter.elaborate_item(interpreter.current_function, |elaborator| {
+                elaborator.resolve_module_by_path(path)
+            })
+        })
+        .map(Value::ModuleDefinition);
+
+    option(return_type, option_value)
+}
+
 // fn as_trait_constraint(quoted: Quoted) -> TraitConstraint
 fn quoted_as_trait_constraint(
     interpreter: &mut Interpreter,
@@ -351,7 +381,7 @@
     })?;
 
     let typ =
         interpreter.elaborate_item(interpreter.current_function, |elab| elab.resolve_type(typ));
 
     Ok(Value::Type(typ))
 }
@@ -652,6 +682,20 @@
     }
 }
 
+// fn name(self) -> Quoted
+fn function_def_name(
+    interner: &NodeInterner,
+    arguments: Vec<(Value, Location)>,
+    location: Location,
+) -> IResult<Value> {
+    let self_argument = check_one_argument(arguments, location)?;
+    let func_id = get_function_def(self_argument, location)?;
+    let func_meta = interner.function_meta(&func_id);
+    let name = &interner.definition(func_meta.name.id).name;
+    let tokens = Rc::new(vec![Token::Ident(name.clone())]);
+    Ok(Value::Quoted(tokens))
+}
+
 // fn parameters(self) -> [(Quoted, Type)]
 fn function_def_parameters(
     interner: &NodeInterner,
@@ -693,6 +737,55 @@
     Ok(Value::Type(func_meta.return_type().follow_bindings()))
 }
 
+// fn functions(self) -> [FunctionDefinition]
+fn module_functions(
+    interpreter: &Interpreter,
+    arguments: Vec<(Value, Location)>,
+    location: Location,
+) -> IResult<Value> {
+    let self_argument = check_one_argument(arguments, location)?;
+    let module_id = get_module(self_argument, location)?;
+    let module_data = interpreter.elaborator.get_module(module_id);
+    let func_ids = module_data
+        .value_definitions()
+        .filter_map(|module_def_id| {
+            if let ModuleDefId::FunctionId(func_id) = module_def_id {
+                Some(Value::FunctionDefinition(func_id))
+            } else {
+                None
+            }
+        })
+        .collect();
+
+    let slice_type = Type::Slice(Box::new(Type::Quoted(QuotedType::FunctionDefinition)));
+
+    Ok(Value::Slice(func_ids, slice_type))
+}
+
+// fn is_contract(self) -> bool
+fn module_is_contract(
+    interpreter: &Interpreter,
+    arguments: Vec<(Value, Location)>,
+    location: Location,
+) -> IResult<Value> {
+    let self_argument = check_one_argument(arguments, location)?;
+    let module_id = get_module(self_argument, location)?;
+    Ok(Value::Bool(interpreter.elaborator.module_is_contract(module_id)))
+}
+
+// fn name(self) -> Quoted
+fn module_name(
+    interner: &NodeInterner,
+    arguments: Vec<(Value, Location)>,
+    location: Location,
+) -> IResult<Value> {
+    let self_argument = check_one_argument(arguments, location)?;
+    let module_id = get_module(self_argument, location)?;
+    let name = &interner.module_attributes(&module_id).name;
+    let tokens = Rc::new(vec![Token::Ident(name.clone())]);
+    Ok(Value::Quoted(tokens))
+}
+
 fn modulus_be_bits(
     _interner: &mut NodeInterner,
     arguments: Vec<(Value, Location)>,

compiler/noirc_frontend/src/hir/comptime/interpreter/builtin/builtin_helpers.rs

@@ -5,7 +5,10 @@ use noirc_errors::Location;
 
 use crate::{
     ast::{IntegerBitSize, Signedness},
-    hir::comptime::{errors::IResult, InterpreterError, Value},
+    hir::{
+        comptime::{errors::IResult, InterpreterError, Value},
+        def_map::ModuleId,
+    },
     hir_def::stmt::HirPattern,
     macros_api::NodeInterner,
     node_interner::{FuncId, TraitId},
@@ -124,6 +127,17 @@ pub(crate) fn get_function_def(value: Value, location: Location) -> IResult<Func
     }
 }
 
+pub(crate) fn get_module(value: Value, location: Location) -> IResult<ModuleId> {
+    match value {
+        Value::ModuleDefinition(module_id) => Ok(module_id),
+        value => {
+            let expected = Type::Quoted(QuotedType::Module);
+            let actual = value.get_type().into_owned();
+            Err(InterpreterError::TypeMismatch { expected, actual, location })
+        }
+    }
+}
+
 pub(crate) fn get_trait_constraint(
     value: Value,
     location: Location,

compiler/noirc_frontend/src/parser/mod.rs

@@ -22,7 +22,9 @@ use chumsky::primitive::Container;
 pub use errors::ParserError;
 pub use errors::ParserErrorReason;
 use noirc_errors::Span;
-pub use parser::{expression, parse_program, parse_type, top_level_items, trait_bound};
+pub use parser::{
+    expression, parse_program, parse_type, path_no_turbofish, top_level_items, trait_bound,
+};
 
 #[derive(Debug, Clone)]
 pub enum TopLevelStatement {

compiler/noirc_frontend/src/parser/parser.rs

@@ -50,7 +50,7 @@
 
 use chumsky::prelude::*;
 use iter_extended::vecmap;
 use lalrpop_util::lalrpop_mod;
 use noirc_errors::{Span, Spanned};
 
 mod assertion;
@@ -64,14 +64,14 @@
 mod traits;
 mod types;
 
 // synthesized by LALRPOP
 lalrpop_mod!(pub noir_parser);
 
 #[cfg(test)]
 mod test_helpers;
 
 use literals::literal;
-use path::{maybe_empty_path, path, path_no_turbofish};
+use path::{maybe_empty_path, path};
 use primitives::{dereference, ident, negation, not, nothing, right_shift_operator, token_kind};
 use traits::where_clause;
 
@@ -90,12 +90,12 @@
 
     if cfg!(feature = "experimental_parser") {
         for parsed_item in &parsed_module.items {
             if lalrpop_parser_supports_kind(&parsed_item.kind) {
                 match &parsed_item.kind {
                     ItemKind::Import(parsed_use_tree) => {
                         prototype_parse_use_tree(Some(parsed_use_tree), source_program);
                     }
                     // other kinds prevented by lalrpop_parser_supports_kind
                     _ => unreachable!(),
                 }
             }
@@ -112,7 +112,7 @@
     }
 
     let mut lexer = Lexer::new(input);
     lexer = lexer.skip_whitespaces(false);
     let mut errors = Vec::new();
 
     // NOTE: this is a hack to get the references working
@@ -370,6 +370,10 @@
     traits::trait_bound()
 }
 
+pub fn path_no_turbofish() -> impl NoirParser<Path> {
+    path::path_no_turbofish()
+}
+
 fn block_expr<'a>(
     statement: impl NoirParser<StatementKind> + 'a,
 ) -> impl NoirParser<Expression> + 'a {

noir_stdlib/src/meta/function_def.nr

@@ -1,4 +1,7 @@
 impl FunctionDefinition {
+    #[builtin(function_def_name)]
+    fn name(self) -> Quoted {}
+
     #[builtin(function_def_parameters)]
     fn parameters(self) -> [(Quoted, Type)] {}
 

noir_stdlib/src/meta/mod.nr

@@ -3,6 +3,7 @@ use crate::hash::BuildHasherDefault;
 use crate::hash::poseidon2::Poseidon2Hasher;
 
 mod function_def;
+mod module;
 mod struct_def;
 mod trait_constraint;
 mod trait_def;

noir_stdlib/src/meta/module.nr

@@ -0,0 +1,10 @@
+impl Module {
+    #[builtin(module_is_contract)]
+    fn is_contract(self) -> bool {}
+
+    #[builtin(module_functions)]
+    fn functions(self) -> [FunctionDefinition] {}
+
+    #[builtin(module_name)]
+    fn name(self) -> Quoted {}
+}

noir_stdlib/src/meta/quoted.nr

@@ -1,6 +1,10 @@
 use crate::cmp::Eq;
+use crate::option::Option;
 
 impl Quoted {
+    #[builtin(quoted_as_module)]
+    fn as_module(self) -> Option<Module> {}
+
     #[builtin(quoted_as_trait_constraint)]
     fn as_trait_constraint(self) -> TraitConstraint {}
 

test_programs/compile_success_empty/comptime_function_definition/src/main.nr

@@ -28,6 +28,9 @@ comptime fn function_attr(f: FunctionDefinition) {
 
     // Check FunctionDefinition::return_type
     assert_eq(f.return_type(), type_of(an_i32));
+
+    // Check FunctionDefinition::name
+    assert_eq(f.name(), quote { foo });
 }
 
 fn main() {}

test_programs/compile_success_empty/comptime_module/Nargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "comptime_module"
+type = "bin"
+authors = [""]
+compiler_version = ">=0.31.0"
+
+[dependencies]

test_programs/compile_success_empty/comptime_module/src/main.nr

@@ -0,0 +1,26 @@
+mod foo {
+    fn x() {}
+    fn y() {}
+}
+
+contract bar {}
+
+fn main() {
+    comptime
+    {
+        // Check Module::is_contract
+        let foo = quote { foo }.as_module().unwrap();
+        assert(!foo.is_contract());
+
+        let bar = quote { bar }.as_module().unwrap();
+        assert(bar.is_contract());
+
+        // Check Module::functions
+        assert_eq(foo.functions().len(), 2);
+        assert_eq(bar.functions().len(), 0);
+
+        // Check Module::name
+        assert_eq(foo.name(), quote { foo });
+        assert_eq(bar.name(), quote { bar });
+    }
+}