feat: add FunctionDefinition::module and StructDefinition::module (…

…#5956)

# Description

## Problem

Resolves #5953

## Summary

## Additional Context

## Documentation

Check one:
- [ ] No documentation needed.
- [x] Documentation included in this PR.
- [ ] **[For Experimental Features]** Documentation to be submitted in a
separate PR.

# PR Checklist

- [x] I have tested the changes locally.
- [x] I have formatted the changes with [Prettier](https://prettier.io/)
and/or `cargo fmt` on default settings.

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

@@ -25,10 +25,13 @@ use crate::{
         FunctionReturnType, IntegerBitSize, LValue, Literal, Statement, StatementKind, UnaryOp,
         UnresolvedType, UnresolvedTypeData, Visibility,
     },
-    hir::comptime::{
-        errors::IResult,
-        value::{ExprValue, TypedExpr},
-        InterpreterError, Value,
+    hir::{
+        comptime::{
+            errors::IResult,
+            value::{ExprValue, TypedExpr},
+            InterpreterError, Value,
+        },
+        def_map::ModuleId,
     },
     hir_def::function::FunctionBody,
     lexer::Lexer,
@@ -102,6 +105,7 @@ impl<'local, 'context> Interpreter<'local, 'context> {
             "function_def_has_named_attribute" => {
                 function_def_has_named_attribute(interner, arguments, location)
             }
+            "function_def_module" => function_def_module(interner, arguments, location),
             "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),
@@ -142,6 +146,7 @@ impl<'local, 'context> Interpreter<'local, 'context> {
             "struct_def_has_named_attribute" => {
                 struct_def_has_named_attribute(interner, arguments, location)
             }
+            "struct_def_module" => struct_def_module(self, arguments, location),
             "struct_def_set_fields" => struct_def_set_fields(interner, arguments, location),
             "to_le_radix" => to_le_radix(arguments, return_type, location),
             "trait_constraint_eq" => trait_constraint_eq(interner, arguments, location),
@@ -399,6 +404,25 @@ fn struct_def_fields(
     Ok(Value::Slice(fields, typ))
 }
 
+// fn module(self) -> Module
+fn struct_def_module(
+    interpreter: &Interpreter,
+    arguments: Vec<(Value, Location)>,
+    location: Location,
+) -> IResult<Value> {
+    let self_argument = check_one_argument(arguments, location)?;
+    let struct_id = get_struct(self_argument)?;
+    let struct_module_id = struct_id.module_id();
+
+    // A struct's module is its own module. To get the module where its defined we need
+    // to look for its parent.
+    let module_data = interpreter.elaborator.get_module(struct_module_id);
+    let parent_local_id = module_data.parent.expect("Expected struct module parent to exist");
+    let parent = ModuleId { krate: struct_module_id.krate, local_id: parent_local_id };
+
+    Ok(Value::ModuleDefinition(parent))
+}
+
 /// fn set_fields(self, new_fields: [(Quoted, Type)]) {}
 /// Returns (name, type) pairs of each field of this StructDefinition
 fn struct_def_set_fields(
@@ -1827,6 +1851,18 @@ fn function_def_has_named_attribute(
     Ok(Value::Bool(has_named_attribute(&name, attributes, location)))
 }
 
+// fn module(self) -> Module
+fn function_def_module(
+    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)?;
+    let module = interner.function_module(func_id);
+    Ok(Value::ModuleDefinition(module))
+}
+
 // fn name(self) -> Quoted
 fn function_def_name(
     interner: &NodeInterner,

compiler/noirc_frontend/src/hir/comptime/value.rs

@@ -653,7 +653,13 @@ impl<'value, 'interner> Display for ValuePrinter<'value, 'interner> {
             Value::FunctionDefinition(function_id) => {
                 write!(f, "{}", self.interner.function_name(function_id))
             }
-            Value::ModuleDefinition(_) => write!(f, "(module)"),
+            Value::ModuleDefinition(module_id) => {
+                if let Some(attributes) = self.interner.try_module_attributes(module_id) {
+                    write!(f, "{}", &attributes.name)
+                } else {
+                    write!(f, "(crate root)")
+                }
+            }
             Value::Zeroed(typ) => write!(f, "(zeroed {typ})"),
             Value::Type(typ) => write!(f, "{:?}", typ),
             Value::Expr(ExprValue::Expression(expr)) => {

docs/docs/noir/standard_library/meta/function_def.md

@@ -29,6 +29,12 @@ This means any functions called at compile-time are invalid targets for this met
 
 Returns true if this function has a custom attribute with the given name.
 
+### module
+
+#include_code module noir_stdlib/src/meta/function_def.nr rust
+
+Returns the module where the function is defined.
+
 ### name
 
 #include_code name noir_stdlib/src/meta/function_def.nr rust

docs/docs/noir/standard_library/meta/struct_def.md

@@ -56,6 +56,12 @@ Returns each field of this struct as a pair of (field name, field type).
 
 Returns true if this struct has a custom attribute with the given name.
 
+### module
+
+#include_code module noir_stdlib/src/meta/struct_def.nr rust
+
+Returns the module where the struct is defined.
+
 ### set_fields
 
 #include_code set_fields noir_stdlib/src/meta/struct_def.nr rust

noir_stdlib/src/meta/function_def.nr

@@ -14,6 +14,11 @@ impl FunctionDefinition {
     fn has_named_attribute(self, name: Quoted) -> bool {}
     // docs:end:has_named_attribute
 
+    #[builtin(function_def_module)]
+    // docs:start:module
+    fn module(self) -> Module {}
+    // docs:end:module
+
     #[builtin(function_def_name)]
     // docs:start:name
     fn name(self) -> Quoted {}

noir_stdlib/src/meta/struct_def.nr

@@ -29,6 +29,11 @@ impl StructDefinition {
     fn fields(self) -> [(Quoted, Type)] {}
     // docs:end:fields
 
+    #[builtin(struct_def_module)]
+    // docs:start:module
+    fn module(self) -> Module {}
+    // docs:end:module
+
     /// Sets the fields of this struct to the given fields list.
     /// All existing fields of the struct will be overridden with the given fields.
     /// Each element of the fields list corresponds to the name and type of a field.

test_programs/compile_success_empty/comptime_function_definition/src/main.nr

@@ -69,3 +69,12 @@ contract some_contract {
 fn set_pub_return(f: FunctionDefinition) {
     f.set_return_public(true);
 }
+
+mod foo {
+    #[attr]
+    pub fn some() {}
+
+    fn attr(f: FunctionDefinition) {
+        assert_eq(f.module().name(), quote { foo });
+    }
+}

test_programs/compile_success_empty/comptime_type_definition/Nargo.toml → test_programs/compile_success_empty/comptime_struct_definition/Nargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "comptime_type_definition"
+name = "comptime_struct_definition"
 type = "bin"
 authors = [""]
 compiler_version = ">=0.31.0"

test_programs/compile_success_empty/comptime_type_definition/src/main.nr → test_programs/compile_success_empty/comptime_struct_definition/src/main.nr

@@ -1,5 +1,3 @@
-fn main() {}
-
 #[my_comptime_fn]
 struct MyType<A, B, C> {
     field1: [A; 10],
@@ -24,3 +22,15 @@ comptime fn mutate_struct_fields(s: StructDefinition) {
     ];
     s.set_fields(fields);
 }
+
+mod foo {
+    #[attr]
+    struct Foo {}
+
+    fn attr(s: StructDefinition) {
+        assert_eq(s.module().name(), quote { foo });
+    }
+}
+
+fn main() {}
+