Update readme

README.md

@@ -59,11 +59,11 @@ Currently missing big features (TODOs) are:
 - ~~Intrinsic functions~~ (DONE)
 - ~~Ability to specify types in literals and variable definitions~~ (DONE)
 - ~~Debug Information~~ (DONE)
-- ~~Fix struct initialization (wrong order and missing fields allowed now)~~
-- ~~Not-Unary~~
-- ~~Importing types from other modules~~
-- ~~Importable binops?~~
-- Associated functions (for e.g. sizeof)
+- ~~Fix struct initialization (wrong order and missing fields allowed now)~~ (DONE)
+- ~~Not-Unary~~ (DONE)
+- ~~Importing types from other modules~~ (DONE)
+- ~~Importable binops?~~ (DONE)
+- ~~Associated functions (for e.g. sizeof)~~ (DONE)
 
 Big features that I want later but are not necessary:
 - ~~User-defined binary operations~~ (DONE)

examples/associated_functions.reid

@@ -0,0 +1,28 @@
+import std::print;
+import std::from_str;
+import std::String;
+
+struct Otus {
+    field: u32,
+}
+
+impl Otus {
+    fn test(&self) -> u32 {
+        *self.field
+    }
+}
+
+impl i32 {
+    fn test(self) -> u32 {
+        43
+    }
+}
+
+fn main() -> u32 {
+    let otus = Otus { field: 17 };
+    print(from_str("otus: ") + Otus::test(&otus) as u64);
+    print(from_str("i32: ") + i32::test(54) as u64);
+    print(from_str("sizeof i32: ") + i32::sizeof());
+
+    return i32::sizeof() as u32;
+}

reid/src/ast/mod.rs

@@ -40,6 +40,7 @@ pub enum TypeKind {
     Custom(String),
     Borrow(Box<TypeKind>, bool),
     Ptr(Box<TypeKind>),
+    Unknown,
 }
 
 #[derive(Debug, Clone)]
@@ -90,6 +91,7 @@ pub enum ExpressionKind {
     Accessed(Box<Expression>, String),
     Binop(BinaryOperator, Box<Expression>, Box<Expression>),
     FunctionCall(Box<FunctionCallExpression>),
+    AssociatedFunctionCall(Type, Box<FunctionCallExpression>),
     BlockExpr(Box<Block>),
     IfExpr(Box<IfExpression>),
     StructExpression(StructExpression),
@@ -170,12 +172,21 @@ pub struct FunctionDefinition(pub FunctionSignature, pub bool, pub Block, pub To
 #[derive(Debug, Clone)]
 pub struct FunctionSignature {
     pub name: String,
-    pub args: Vec<(String, Type)>,
+    pub self_kind: SelfKind,
+    pub params: Vec<(String, Type)>,
     pub return_type: Option<Type>,
     #[allow(dead_code)]
     pub range: TokenRange,
 }
 
+#[derive(Debug, Clone)]
+pub enum SelfKind {
+    Owned(TypeKind),
+    Borrow(TypeKind),
+    MutBorrow(TypeKind),
+    None,
+}
+
 #[derive(Debug, Clone, Copy)]
 pub enum ReturnType {
     Soft,
@@ -236,6 +247,7 @@ pub enum TopLevelStatement {
     FunctionDefinition(FunctionDefinition),
     TypeDefinition(TypeDefinition),
     BinopDefinition(BinopDefinition),
+    AssociatedFunction(Type, Vec<FunctionDefinition>),
 }
 
 #[derive(Debug)]

reid/src/ast/parse.rs

@@ -167,6 +167,18 @@ fn specific_int_lit(value: u128, stream: &mut TokenStream) -> Result<Expression,
     ))
 }
 
+#[derive(Debug)]
+pub struct AssociatedFunctionCall(Type, FunctionCallExpression);
+
+impl Parse for AssociatedFunctionCall {
+    fn parse(mut stream: TokenStream) -> Result<Self, Error> {
+        let ty = stream.parse()?;
+        stream.expect(Token::Colon)?;
+        stream.expect(Token::Colon)?;
+        Ok(AssociatedFunctionCall(ty, stream.parse()?))
+    }
+}
+
 #[derive(Debug)]
 pub struct PrimaryExpression(Expression);
 
@@ -200,6 +212,11 @@ impl Parse for PrimaryExpression {
                 Kind::UnaryOperation(unary, Box::new(stream.parse()?)),
                 stream.get_range().unwrap(),
             )
+        } else if let Ok(assoc_function) = stream.parse::<AssociatedFunctionCall>() {
+            Expression(
+                Kind::AssociatedFunctionCall(assoc_function.0, Box::new(assoc_function.1)),
+                stream.get_range().unwrap(),
+            )
         } else if let Some(token) = stream.peek() {
             match &token {
                 Token::Identifier(v) => {
@@ -579,18 +596,58 @@ impl Parse for FunctionParam {
     }
 }
 
+#[derive(Debug)]
+pub struct SelfParam(SelfKind);
+
+pub enum SelfParamKind {
+    Owned,
+    Borrow,
+    BorrowMut,
+}
+
+impl Parse for SelfParam {
+    fn parse(mut stream: TokenStream) -> Result<Self, Error> {
+        let kind = if let Some(Token::Et) = stream.peek() {
+            stream.next();
+            if let Some(Token::MutKeyword) = stream.peek() {
+                stream.next();
+                SelfParamKind::BorrowMut
+            } else {
+                SelfParamKind::Borrow
+            }
+        } else {
+            SelfParamKind::Owned
+        };
+
+        let Some(Token::Identifier(name)) = stream.next() else {
+            return Err(stream.expected_err("parameter name")?);
+        };
+        if name == "self" {
+            match kind {
+                SelfParamKind::BorrowMut => Ok(SelfParam(SelfKind::MutBorrow(TypeKind::Unknown))),
+                SelfParamKind::Borrow => Ok(SelfParam(SelfKind::Borrow(TypeKind::Unknown))),
+                SelfParamKind::Owned => Ok(SelfParam(SelfKind::Owned(TypeKind::Unknown))),
+            }
+        } else {
+            Err(stream.expected_err("self parameter")?)
+        }
+    }
+}
+
 impl Parse for FunctionSignature {
     fn parse(mut stream: TokenStream) -> Result<Self, Error> {
         if let Some(Token::Identifier(name)) = stream.next() {
             stream.expect(Token::ParenOpen)?;
-            let mut args = Vec::new();
+            let mut params = Vec::new();
+
+            let self_kind = stream.parse::<SelfParam>().map(|s| s.0).unwrap_or(SelfKind::None);
 
             if let Ok(param) = stream.parse::<FunctionParam>() {
-                args.push((param.0, param.1));
+                params.push((param.0, param.1));
                 while let Some(Token::Comma) = stream.peek() {
                     stream.next();
                     let param = stream.parse::<FunctionParam>()?;
-                    args.push((param.0, param.1));
+                    params.push((param.0, param.1));
                 }
             }
 
@@ -603,7 +660,8 @@ impl Parse for FunctionSignature {
 
             Ok(FunctionSignature {
                 name,
-                args,
+                params,
+                self_kind,
                 return_type,
                 range: stream.get_range().unwrap(),
             })
@@ -874,7 +932,14 @@ impl Parse for TopLevelStatement {
                     range,
                 })
             }
-            Some(Token::Impl) => Stmt::BinopDefinition(stream.parse()?),
+            Some(Token::Impl) => match stream.peek2() {
+                Some(Token::Binop) => Stmt::BinopDefinition(stream.parse()?),
+                Some(_) => {
+                    let AssociatedFunctionBlock(ty, functions) = stream.parse::<AssociatedFunctionBlock>()?;
+                    Stmt::AssociatedFunction(ty, functions)
+                }
+                _ => Err(stream.expecting_err("binop or associated function block")?)?,
+            },
             _ => Err(stream.expecting_err("import or fn")?)?,
         })
     }
@@ -917,3 +982,28 @@ impl Parse for BinopDefinition {
         })
     }
 }
+
+#[derive(Debug)]
+pub struct AssociatedFunctionBlock(Type, Vec<FunctionDefinition>);
+
+impl Parse for AssociatedFunctionBlock {
+    fn parse(mut stream: TokenStream) -> Result<Self, Error> {
+        stream.expect(Token::Impl)?;
+        let ty = stream.parse::<Type>()?;
+        stream.expect(Token::BraceOpen)?;
+        let mut functions = Vec::new();
+        while let Some(Token::FnKeyword) = stream.peek() {
+            let mut fun: FunctionDefinition = stream.parse()?;
+            fun.0.self_kind = match fun.0.self_kind {
+                SelfKind::Owned(_) => SelfKind::Owned(ty.0.clone()),
+                SelfKind::Borrow(_) => SelfKind::Borrow(ty.0.clone()),
+                SelfKind::MutBorrow(_) => SelfKind::MutBorrow(ty.0.clone()),
+                SelfKind::None => SelfKind::None,
+            };
+            functions.push(fun);
+        }
+
+        stream.expect(Token::BraceClose)?;
+        Ok(AssociatedFunctionBlock(ty, functions))
+    }
+}

reid/src/ast/process.rs

@@ -21,6 +21,7 @@ impl mir::Context {
 impl ast::Module {
     pub fn process(self, module_id: SourceModuleId) -> mir::Module {
         let mut imports = Vec::new();
+        let mut associated_functions = Vec::new();
         let mut functions = Vec::new();
         let mut typedefs = Vec::new();
         let mut binops = Vec::new();
@@ -31,29 +32,7 @@ impl ast::Module {
                 Import(import) => {
                     imports.push(mir::Import(import.0.clone(), import.1.as_meta(module_id)));
                 }
-                FunctionDefinition(ast::FunctionDefinition(signature, is_pub, block, range)) => {
-                    let def = mir::FunctionDefinition {
-                        name: signature.name.clone(),
-                        is_pub: *is_pub,
-                        is_imported: false,
-                        return_type: signature
-                            .return_type
-                            .clone()
-                            .map(|r| r.0.into_mir(module_id))
-                            .unwrap_or(mir::TypeKind::Void),
-                        parameters: signature
-                            .args
-                            .iter()
-                            .cloned()
-                            .map(|p| (p.0, p.1 .0.into_mir(module_id)))
-                            .collect(),
-                        kind: mir::FunctionDefinitionKind::Local(
-                            block.into_mir(module_id),
-                            (*range).as_meta(module_id),
-                        ),
-                    };
-                    functions.push(def);
-                }
+                FunctionDefinition(function_def) => functions.push(function_def.into_mir(module_id)),
                 ExternFunction(signature) => {
                     let def = mir::FunctionDefinition {
                         name: signature.name.clone(),
@@ -65,7 +44,7 @@ impl ast::Module {
                             .map(|r| r.0.into_mir(module_id))
                             .unwrap_or(mir::TypeKind::Void),
                         parameters: signature
-                            .args
+                            .params
                             .iter()
                             .cloned()
                             .map(|p| (p.0, p.1 .0.into_mir(module_id)))
@@ -120,6 +99,11 @@ impl ast::Module {
                         exported: false,
                     });
                 }
+                AssociatedFunction(ty, function_definition) => {
+                    for function_def in function_definition {
+                        associated_functions.push((ty.0.into_mir(module_id), function_def.into_mir(module_id)));
+                    }
+                }
             }
         }
 
@@ -128,6 +112,7 @@ impl ast::Module {
             module_id: module_id,
             binop_defs: binops,
             imports,
+            associated_functions,
             functions,
             path: self.path.clone(),
             is_main: self.is_main,
@@ -137,6 +122,46 @@ impl ast::Module {
     }
 }
 
+impl ast::FunctionDefinition {
+    pub fn into_mir(&self, module_id: SourceModuleId) -> mir::FunctionDefinition {
+        let &ast::FunctionDefinition(signature, is_pub, block, range) = &self;
+
+        let mut params = Vec::new();
+        match &signature.self_kind {
+            ast::SelfKind::Borrow(type_kind) => params.push((
+                "self".to_owned(),
+                mir::TypeKind::Borrow(Box::new(type_kind.into_mir(module_id)), false),
+            )),
+            ast::SelfKind::MutBorrow(type_kind) => params.push((
+                "self".to_owned(),
+                mir::TypeKind::Borrow(Box::new(type_kind.into_mir(module_id)), true),
+            )),
+            ast::SelfKind::Owned(type_kind) => params.push(("self".to_owned(), type_kind.into_mir(module_id))),
+            ast::SelfKind::None => {}
+        }
+
+        params.extend(
+            signature
+                .params
+                .iter()
+                .cloned()
+                .map(|p| (p.0, p.1 .0.into_mir(module_id))),
+        );
+        mir::FunctionDefinition {
+            name: signature.name.clone(),
+            is_pub: *is_pub,
+            is_imported: false,
+            return_type: signature
+                .return_type
+                .clone()
+                .map(|r| r.0.into_mir(module_id))
+                .unwrap_or(mir::TypeKind::Void),
+            parameters: params,
+            kind: mir::FunctionDefinitionKind::Local(block.into_mir(module_id), (range).as_meta(module_id)),
+        }
+    }
+}
+
 impl ast::Block {
     pub fn into_mir(&self, module_id: SourceModuleId) -> mir::Block {
         let mut mir_statements = Vec::new();
@@ -388,6 +413,15 @@ impl ast::Expression {
                     .map(|e| e.process(module_id))
                     .collect(),
             ),
+            ast::ExpressionKind::AssociatedFunctionCall(ty, fn_call_expr) => mir::ExprKind::AssociatedFunctionCall(
+                ty.0.into_mir(module_id),
+                mir::FunctionCall {
+                    name: fn_call_expr.0.clone(),
+                    return_type: mir::TypeKind::Vague(mir::VagueType::Unknown),
+                    parameters: fn_call_expr.1.iter().map(|e| e.process(module_id)).collect(),
+                    meta: fn_call_expr.2.as_meta(module_id),
+                },
+            ),
         };
 
         mir::Expression(kind, self.1.as_meta(module_id))
@@ -474,6 +508,7 @@ impl ast::TypeKind {
             ast::TypeKind::F128 => mir::TypeKind::F128,
             ast::TypeKind::F128PPC => mir::TypeKind::F128PPC,
             ast::TypeKind::Char => mir::TypeKind::Char,
+            ast::TypeKind::Unknown => mir::TypeKind::Vague(mir::VagueType::Unknown),
         }
     }
 }

reid/src/codegen/allocator.rs

@@ -5,9 +5,9 @@ use reid_lib::{
     Block,
 };
 
-use crate::mir::{
-    self, CustomTypeKey, FunctionCall, FunctionDefinitionKind, IfExpression, SourceModuleId, TypeKind, WhileStatement,
-};
+use mir::{CustomTypeKey, FunctionCall, FunctionDefinitionKind, IfExpression, TypeKind, WhileStatement};
+
+use crate::mir;
 
 #[derive(Debug)]
 pub struct Allocator {
@@ -16,17 +16,10 @@ pub struct Allocator {
 
 pub struct AllocatorScope<'ctx, 'a> {
     pub(super) block: &'a mut Block<'ctx>,
-    pub(super) module_id: SourceModuleId,
     pub(super) type_values: &'a HashMap<CustomTypeKey, TypeValue>,
 }
 
 impl Allocator {
-    pub fn empty() -> Allocator {
-        Allocator {
-            allocations: Vec::new(),
-        }
-    }
-
     pub fn from(
         func: &FunctionDefinitionKind,
         params: &Vec<(String, TypeKind)>,
@@ -100,7 +93,7 @@ impl mir::Statement {
         let mut allocated = Vec::new();
 
         match &self.0 {
-            crate::mir::StmtKind::Let(named_variable_ref, _, expression) => {
+            mir::StmtKind::Let(named_variable_ref, _, expression) => {
                 allocated.extend(expression.allocate(scope));
                 let allocation = scope
                     .block
@@ -115,15 +108,15 @@ impl mir::Statement {
                     allocation,
                 ));
             }
-            crate::mir::StmtKind::Set(lhs, rhs) => {
+            mir::StmtKind::Set(lhs, rhs) => {
                 allocated.extend(lhs.allocate(scope));
                 allocated.extend(rhs.allocate(scope));
             }
-            crate::mir::StmtKind::Import(_) => {}
-            crate::mir::StmtKind::Expression(expression) => {
+            mir::StmtKind::Import(_) => {}
+            mir::StmtKind::Expression(expression) => {
                 allocated.extend(expression.allocate(scope));
             }
-            crate::mir::StmtKind::While(WhileStatement { condition, block, .. }) => {
+            mir::StmtKind::While(WhileStatement { condition, block, .. }) => {
                 allocated.extend(condition.allocate(scope));
                 allocated.extend(block.allocate(scope));
             }
@@ -138,49 +131,54 @@ impl mir::Expression {
         let mut allocated = Vec::new();
 
         match &self.0 {
-            crate::mir::ExprKind::Variable(_) => {}
-            crate::mir::ExprKind::Indexed(expr, _, idx) => {
+            mir::ExprKind::Variable(_) => {}
+            mir::ExprKind::Indexed(expr, _, idx) => {
                 allocated.extend(expr.allocate(scope));
                 allocated.extend(idx.allocate(scope));
             }
-            crate::mir::ExprKind::Accessed(expression, _, _) => {
+            mir::ExprKind::Accessed(expression, _, _) => {
                 allocated.extend(expression.allocate(scope));
             }
-            crate::mir::ExprKind::Array(expressions) => {
+            mir::ExprKind::Array(expressions) => {
                 for expression in expressions {
                     allocated.extend(expression.allocate(scope));
                 }
             }
-            crate::mir::ExprKind::Struct(_, items) => {
+            mir::ExprKind::Struct(_, items) => {
                 for (_, expression) in items {
                     allocated.extend(expression.allocate(scope));
                 }
             }
-            crate::mir::ExprKind::Literal(_) => {}
-            crate::mir::ExprKind::BinOp(_, lhs, rhs, _) => {
+            mir::ExprKind::Literal(_) => {}
+            mir::ExprKind::BinOp(_, lhs, rhs, _) => {
                 allocated.extend(lhs.allocate(scope));
                 allocated.extend(rhs.allocate(scope));
             }
-            crate::mir::ExprKind::FunctionCall(FunctionCall { parameters, .. }) => {
+            mir::ExprKind::FunctionCall(FunctionCall { parameters, .. }) => {
                 for param in parameters {
                     allocated.extend(param.allocate(scope));
                 }
             }
-            crate::mir::ExprKind::If(IfExpression(cond, then_ex, else_ex)) => {
+            mir::ExprKind::If(IfExpression(cond, then_ex, else_ex)) => {
                 allocated.extend(cond.allocate(scope));
                 allocated.extend(then_ex.allocate(scope));
                 if let Some(else_ex) = else_ex.as_ref() {
                     allocated.extend(else_ex.allocate(scope));
                 }
             }
-            crate::mir::ExprKind::Block(block) => {
+            mir::ExprKind::Block(block) => {
                 allocated.extend(block.allocate(scope));
             }
-            crate::mir::ExprKind::Borrow(_, _) => {}
-            crate::mir::ExprKind::Deref(_) => {}
-            crate::mir::ExprKind::CastTo(expression, _) => {
+            mir::ExprKind::Borrow(_, _) => {}
+            mir::ExprKind::Deref(_) => {}
+            mir::ExprKind::CastTo(expression, _) => {
                 allocated.extend(expression.allocate(scope));
             }
+            mir::ExprKind::AssociatedFunctionCall(_, FunctionCall { parameters, .. }) => {
+                for param in parameters {
+                    allocated.extend(param.allocate(scope));
+                }
+            }
         }
 
         allocated

reid/src/codegen/intrinsics.rs

@@ -1,5 +1,3 @@
-use std::marker::PhantomData;
-
 use reid_lib::{builder::InstructionValue, CmpPredicate, Instr};
 
 use crate::{
@@ -38,6 +36,20 @@ pub fn form_intrinsics() -> Vec<FunctionDefinition> {
     intrinsics
 }
 
+pub fn get_intrinsic_assoc_func(ty: &TypeKind, name: &str) -> Option<FunctionDefinition> {
+    match name {
+        "sizeof" => Some(FunctionDefinition {
+            name: "sizeof".to_owned(),
+            is_pub: true,
+            is_imported: false,
+            return_type: TypeKind::U64,
+            parameters: Vec::new(),
+            kind: FunctionDefinitionKind::Intrinsic(Box::new(IntrinsicSizeOf(ty.clone()))),
+        }),
+        _ => None,
+    }
+}
+
 fn simple_binop_def<T: Clone + 'static>(op: BinaryOperator, ty: &TypeKind, fun: T) -> BinopDefinition
 where
     T: FnOnce(&mut Scope, InstructionValue, InstructionValue) -> InstructionValue,
@@ -169,28 +181,33 @@ pub fn form_intrinsic_binops() -> Vec<BinopDefinition> {
 }
 
 pub trait IntrinsicFunction: std::fmt::Debug {
-    fn codegen<'ctx, 'a>(&self, scope: &mut Scope<'ctx, 'a>, params: &[&StackValue]) -> Result<StackValue, ErrorKind>;
+    fn codegen<'ctx, 'a>(&self, scope: &mut Scope<'ctx, 'a>, params: &[StackValue]) -> Result<StackValue, ErrorKind>;
+}
+
+macro_rules! intrinsic_debug {
+    ($kind:ty, $name:literal) => {
+        impl<T> std::fmt::Debug for $kind
+        where
+            T: FnOnce(&mut Scope, InstructionValue, InstructionValue) -> InstructionValue,
+        {
+            fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+                f.debug_tuple($name).finish()
+            }
+        }
+    };
 }
 
 #[derive(Clone)]
 pub struct IntrinsicSimpleInstr<T>(T)
 where
     T: FnOnce(&mut Scope, InstructionValue, InstructionValue) -> InstructionValue;
-
-impl<T> std::fmt::Debug for IntrinsicSimpleInstr<T>
-where
-    T: FnOnce(&mut Scope, InstructionValue, InstructionValue) -> InstructionValue,
-{
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        f.debug_tuple("IntrinsicSimpleInstr").finish()
-    }
-}
+intrinsic_debug!(IntrinsicSimpleInstr<T>, "IntrinsicSimpleInstr");
 
 impl<T: Clone> IntrinsicFunction for IntrinsicSimpleInstr<T>
 where
     T: FnOnce(&mut Scope, InstructionValue, InstructionValue) -> InstructionValue,
 {
-    fn codegen<'b, 'c>(&self, scope: &mut Scope<'b, 'c>, params: &[&StackValue]) -> Result<StackValue, ErrorKind> {
+    fn codegen<'b, 'c>(&self, scope: &mut Scope<'b, 'c>, params: &[StackValue]) -> Result<StackValue, ErrorKind> {
         let lhs = params.get(0).unwrap();
         let rhs = params.get(1).unwrap();
         let instr = self.clone().0(scope, lhs.instr(), rhs.instr());
@@ -202,21 +219,13 @@ where
 pub struct IntrinsicBooleanInstr<T>(T)
 where
     T: FnOnce(&mut Scope, InstructionValue, InstructionValue) -> InstructionValue;
-
-impl<T> std::fmt::Debug for IntrinsicBooleanInstr<T>
-where
-    T: FnOnce(&mut Scope, InstructionValue, InstructionValue) -> InstructionValue,
-{
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        f.debug_tuple("IntrinsicBooleanInstr").finish()
-    }
-}
+intrinsic_debug!(IntrinsicBooleanInstr<T>, "IntrinsicBooleanInstr");
 
 impl<T: Clone> IntrinsicFunction for IntrinsicBooleanInstr<T>
 where
     T: FnOnce(&mut Scope, InstructionValue, InstructionValue) -> InstructionValue,
 {
-    fn codegen<'b, 'c>(&self, scope: &mut Scope<'b, 'c>, params: &[&StackValue]) -> Result<StackValue, ErrorKind> {
+    fn codegen<'b, 'c>(&self, scope: &mut Scope<'b, 'c>, params: &[StackValue]) -> Result<StackValue, ErrorKind> {
         let lhs = params.get(0).unwrap();
         let rhs = params.get(1).unwrap();
         let instr = self.clone().0(scope, lhs.instr(), rhs.instr());
@@ -224,6 +233,24 @@ where
     }
 }
 
+#[derive(Clone)]
+pub struct IntrinsicSizeOf(TypeKind);
+impl std::fmt::Debug for IntrinsicSizeOf {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_tuple("IntrinsicSizeOf").finish()
+    }
+}
+
+impl IntrinsicFunction for IntrinsicSizeOf {
+    fn codegen<'ctx, 'a>(&self, scope: &mut Scope<'ctx, 'a>, _: &[StackValue]) -> Result<StackValue, ErrorKind> {
+        let instr = scope
+            .block
+            .build(Instr::Constant(reid_lib::ConstValue::U64(self.0.size_of())))
+            .unwrap();
+        Ok(StackValue(StackValueKind::Literal(instr), self.0.clone()))
+    }
+}
+
 // impl IntrinsicFunction for IntrinsicIAdd {
 //     fn codegen<'ctx, 'a>(
 //         &self,

reid/src/codegen/mod.rs

@@ -15,8 +15,11 @@ use scope::*;
 
 use crate::{
     mir::{
-        self, implement::TypeCategory, pass::BinopKey, CustomTypeKey, FunctionDefinitionKind, NamedVariableRef,
-        SourceModuleId, StructField, StructType, TypeDefinition, TypeDefinitionKind, TypeKind, WhileStatement,
+        self,
+        implement::TypeCategory,
+        pass::{AssociatedFunctionKey, BinopKey},
+        CustomTypeKey, FunctionCall, FunctionDefinitionKind, NamedVariableRef, SourceModuleId, StructField, StructType,
+        TypeDefinition, TypeDefinitionKind, TypeKind, WhileStatement,
     },
     util::try_all,
 };
@@ -208,7 +211,50 @@ impl mir::Module {
             };
 
             if let Some(func) = func {
-                functions.insert(function.name.clone(), func);
+                functions.insert(function.name.clone(), ScopeFunctionKind::UserGenerated(func));
+            }
+        }
+
+        let mut associated_functions = HashMap::new();
+
+        for (ty, function) in &self.associated_functions {
+            let param_types: Vec<Type> = function
+                .parameters
+                .iter()
+                .map(|(_, p)| p.get_type(&type_values))
+                .collect();
+
+            let is_main = self.is_main && function.name == "main";
+            let func = match &function.kind {
+                mir::FunctionDefinitionKind::Local(_, _) => Some(module.function(
+                    &format!("{}::{}", ty, function.name),
+                    function.return_type.get_type(&type_values),
+                    param_types,
+                    FunctionFlags {
+                        is_pub: function.is_pub || is_main,
+                        is_main,
+                        is_imported: function.is_imported,
+                        ..FunctionFlags::default()
+                    },
+                )),
+                mir::FunctionDefinitionKind::Extern(imported) => Some(module.function(
+                    &function.name,
+                    function.return_type.get_type(&type_values),
+                    param_types,
+                    FunctionFlags {
+                        is_extern: true,
+                        is_imported: *imported,
+                        ..FunctionFlags::default()
+                    },
+                )),
+                mir::FunctionDefinitionKind::Intrinsic(_) => None,
+            };
+
+            if let Some(func) = func {
+                associated_functions.insert(
+                    AssociatedFunctionKey(ty.clone(), function.name.clone()),
+                    ScopeFunctionKind::UserGenerated(func),
+                );
             }
         }
 
@@ -227,7 +273,7 @@ impl mir::Module {
                     parameters: (binop.lhs.clone(), binop.rhs.clone()),
                     return_ty: binop.return_type.clone(),
                     kind: match &binop.fn_kind {
-                        FunctionDefinitionKind::Local(block, metadata) => {
+                        FunctionDefinitionKind::Local(..) => {
                             let ir_function = module.function(
                                 &binop_fn_name,
                                 binop.return_type.get_type(&type_values),
@@ -246,7 +292,6 @@ impl mir::Module {
                                 &vec![binop.lhs.clone(), binop.rhs.clone()],
                                 &mut AllocatorScope {
                                     block: &mut entry,
-                                    module_id: self.module_id,
                                     type_values: &type_values,
                                 },
                             );
@@ -259,6 +304,7 @@ impl mir::Module {
                                 module_id: self.module_id,
                                 function: &ir_function,
                                 block: entry,
+                                assoc_functions: &associated_functions,
                                 functions: &functions,
                                 types: &types,
                                 type_values: &type_values,
@@ -289,10 +335,9 @@ impl mir::Module {
                                 )
                                 .unwrap();
 
-                            StackBinopFunctionKind::UserGenerated(ir_function)
+                            ScopeFunctionKind::UserGenerated(ir_function)
                         }
-                        FunctionDefinitionKind::Extern(imported) => {
-                            StackBinopFunctionKind::UserGenerated(module.function(
+                        FunctionDefinitionKind::Extern(imported) => ScopeFunctionKind::UserGenerated(module.function(
                             &binop_fn_name,
                             binop.return_type.get_type(&type_values),
                             vec![binop.lhs.1.get_type(&type_values), binop.rhs.1.get_type(&type_values)],
@@ -301,10 +346,9 @@ impl mir::Module {
                                 is_imported: *imported,
                                 ..FunctionFlags::default()
                             },
-                            ))
-                        }
+                        )),
                         FunctionDefinitionKind::Intrinsic(intrinsic_function) => {
-                            StackBinopFunctionKind::Intrinsic(intrinsic_function)
+                            ScopeFunctionKind::Intrinsic(intrinsic_function)
                         }
                     },
                 },
@@ -312,7 +356,7 @@ impl mir::Module {
         }
 
         for mir_function in &self.functions {
-            let function = functions.get(&mir_function.name).unwrap();
+            if let ScopeFunctionKind::UserGenerated(function) = functions.get(&mir_function.name).unwrap() {
                 let mut entry = function.block("entry");
 
                 let allocator = Allocator::from(
@@ -320,7 +364,6 @@ impl mir::Module {
                     &mir_function.parameters,
                     &mut AllocatorScope {
                         block: &mut entry,
-                    module_id: self.module_id,
                         type_values: &type_values,
                     },
                 );
@@ -333,6 +376,7 @@ impl mir::Module {
                     module_id: self.module_id,
                     function,
                     block: entry,
+                    assoc_functions: &associated_functions,
                     functions: &functions,
                     types: &types,
                     type_values: &type_values,
@@ -356,13 +400,75 @@ impl mir::Module {
                         &mir_function.return_type,
                         &function,
                         match &mir_function.kind {
-                        FunctionDefinitionKind::Local(..) => mir_function.signature().into_debug(tokens, compile_unit),
+                            FunctionDefinitionKind::Local(..) => {
+                                mir_function.signature().into_debug(tokens, compile_unit)
+                            }
                             FunctionDefinitionKind::Extern(_) => None,
                             FunctionDefinitionKind::Intrinsic(_) => None,
                         },
                     )
                     .unwrap();
             }
+        }
+
+        for (ty, mir_function) in &self.associated_functions {
+            if let ScopeFunctionKind::UserGenerated(function) = associated_functions
+                .get(&AssociatedFunctionKey(ty.clone(), mir_function.name.clone()))
+                .unwrap()
+            {
+                let mut entry = function.block("entry");
+
+                let allocator = Allocator::from(
+                    &mir_function.kind,
+                    &mir_function.parameters,
+                    &mut AllocatorScope {
+                        block: &mut entry,
+                        type_values: &type_values,
+                    },
+                );
+
+                let mut scope = Scope {
+                    context,
+                    modules: &modules,
+                    tokens,
+                    module: &module,
+                    module_id: self.module_id,
+                    function,
+                    block: entry,
+                    assoc_functions: &associated_functions,
+                    functions: &functions,
+                    types: &types,
+                    type_values: &type_values,
+                    stack_values: HashMap::new(),
+                    debug: Some(Debug {
+                        info: &debug,
+                        scope: compile_unit,
+                        types: &debug_types,
+                    }),
+                    binops: &binops,
+                    allocator: Rc::new(RefCell::new(allocator)),
+                };
+
+                mir_function
+                    .kind
+                    .codegen(
+                        mir_function.name.clone(),
+                        mir_function.is_pub,
+                        &mut scope,
+                        &mir_function.parameters,
+                        &mir_function.return_type,
+                        &function,
+                        match &mir_function.kind {
+                            FunctionDefinitionKind::Local(..) => {
+                                mir_function.signature().into_debug(tokens, compile_unit)
+                            }
+                            FunctionDefinitionKind::Extern(_) => None,
+                            FunctionDefinitionKind::Intrinsic(_) => None,
+                        },
+                    )
+                    .unwrap();
+            }
+        }
 
         Ok(ModuleCodegen { module })
     }
@@ -723,7 +829,7 @@ impl mir::Expression {
                 });
 
                 if let Some(operation) = operation {
-                    let a = operation.codegen(&lhs_val, &rhs_val, scope)?;
+                    let a = operation.codegen(lhs_val.clone(), rhs_val.clone(), scope)?;
                     Some(a)
                 } else {
                     let lhs_type = lhs_exp.return_type(&Default::default(), scope.module_id).unwrap().1;
@@ -792,72 +898,7 @@ impl mir::Expression {
                     ))
                 }
             }
-            mir::ExprKind::FunctionCall(call) => {
-                let ret_type_kind = call.return_type.known().expect("function return type unknown");
-
-                let ret_type = ret_type_kind.get_type(scope.type_values);
-
-                let params = try_all(
-                    call.parameters
-                        .iter()
-                        .map(|e| e.codegen(scope, state))
-                        .collect::<Vec<_>>(),
-                )
-                .map_err(|e| e.first().cloned().unwrap())?
-                .into_iter()
-                .map(|v| v.unwrap())
-                .collect::<Vec<_>>();
-
-                let param_instrs = params.iter().map(|e| e.instr()).collect();
-                let callee = scope.functions.get(&call.name).expect("function not found!");
-
-                let val = scope
-                    .block
-                    .build_named(call.name.clone(), Instr::FunctionCall(callee.value(), param_instrs))
-                    .unwrap();
-
-                if let Some(debug) = &scope.debug {
-                    let location = call.meta.into_debug(scope.tokens, debug.scope).unwrap();
-                    let location_val = debug.info.location(&debug.scope, location);
-                    val.with_location(&mut scope.block, location_val);
-                }
-
-                let ptr = if ret_type_kind != TypeKind::Void {
-                    let ptr = scope
-                        .block
-                        .build_named(&call.name, Instr::Alloca(ret_type.clone()))
-                        .unwrap();
-                    scope
-                        .block
-                        .build_named(format!("{}.store", call.name), Instr::Store(ptr, val))
-                        .unwrap();
-
-                    Some(ptr)
-                } else {
-                    None
-                };
-
-                if let Some(ptr) = ptr {
-                    if state.should_load {
-                        Some(StackValue(
-                            StackValueKind::Immutable(
-                                scope
-                                    .block
-                                    .build_named(call.name.clone(), Instr::Load(ptr, ret_type))
-                                    .unwrap(),
-                            ),
-                            ret_type_kind,
-                        ))
-                    } else {
-                        Some(StackValue(
-                            StackValueKind::Immutable(ptr),
-                            TypeKind::CodegenPtr(Box::new(ret_type_kind)),
-                        ))
-                    }
-                } else {
-                    None
-                }
-            }
+            mir::ExprKind::FunctionCall(call) => codegen_function_call(None, call, scope, state)?,
             mir::ExprKind::If(if_expression) => if_expression.codegen(scope, state)?,
             mir::ExprKind::Block(block) => {
                 let inner = scope.function.block("inner");
@@ -1217,6 +1258,7 @@ impl mir::Expression {
                     }
                 }
             }
+            mir::ExprKind::AssociatedFunctionCall(ty, call) => codegen_function_call(Some(ty), call, scope, state)?,
         };
         if let Some(value) = &value {
             value.instr().maybe_location(&mut scope.block, location);
@@ -1225,6 +1267,103 @@ impl mir::Expression {
     }
 }
 
+fn codegen_function_call<'ctx, 'a>(
+    associated_type: Option<&TypeKind>,
+    call: &FunctionCall,
+    scope: &mut Scope<'ctx, 'a>,
+    state: &State,
+) -> Result<Option<StackValue>, ErrorKind> {
+    let ret_type_kind = call.return_type.known().expect("function return type unknown");
+    let call_name = if let Some(ty) = &associated_type {
+        format!("{}::{}", ty, call.name)
+    } else {
+        String::from(call.name.clone())
+    };
+
+    let ret_type = ret_type_kind.get_type(scope.type_values);
+
+    let params = try_all(
+        call.parameters
+            .iter()
+            .map(|e| e.codegen(scope, state))
+            .collect::<Vec<_>>(),
+    )
+    .map_err(|e| e.first().cloned().unwrap())?
+    .into_iter()
+    .map(|v| v.unwrap())
+    .collect::<Vec<_>>();
+
+    let location = if let Some(debug) = &scope.debug {
+        call.meta.into_debug(scope.tokens, debug.scope)
+    } else {
+        None
+    };
+
+    let val = if let Some(ty) = associated_type {
+        let assoc_key = AssociatedFunctionKey(ty.clone(), call.name.clone());
+        let intrinsic_def = get_intrinsic_assoc_func(&ty, &call.name);
+        let intrinsic = intrinsic_def.map(|func_def| {
+            let FunctionDefinitionKind::Intrinsic(intrinsic) = func_def.kind else {
+                panic!();
+            };
+            ScopeFunctionKind::IntrinsicOwned(intrinsic)
+        });
+        let callee = scope
+            .assoc_functions
+            .get(&assoc_key)
+            .or(intrinsic.as_ref())
+            .expect(&format!("Function {} does not exist!", call_name));
+        callee
+            .codegen(&call_name, params.as_slice(), &call.return_type, location, scope)
+            .unwrap()
+    } else {
+        let callee = scope
+            .functions
+            .get(&call.name)
+            .expect(&format!("Function {} does not exist!", call_name));
+
+        callee
+            .codegen(&call_name, params.as_slice(), &call.return_type, location, scope)
+            .unwrap()
+    };
+
+    let ptr = if ret_type_kind != TypeKind::Void {
+        let ptr = scope
+            .block
+            .build_named(&call.name, Instr::Alloca(ret_type.clone()))
+            .unwrap();
+        scope
+            .block
+            .build_named(format!("{}.store", call_name), Instr::Store(ptr, val.instr()))
+            .unwrap();
+
+        Some(ptr)
+    } else {
+        None
+    };
+
+    Ok(if let Some(ptr) = ptr {
+        if state.should_load {
+            Some(StackValue(
+                StackValueKind::Immutable(
+                    scope
+                        .block
+                        .build_named(call.name.clone(), Instr::Load(ptr, ret_type))
+                        .unwrap(),
+                ),
+                ret_type_kind,
+            ))
+        } else {
+            Some(StackValue(
+                StackValueKind::Immutable(ptr),
+                TypeKind::CodegenPtr(Box::new(ret_type_kind)),
+            ))
+        }
+    } else {
+        None
+    })
+}
+
 impl mir::IfExpression {
     fn codegen<'ctx, 'a>(&self, scope: &mut Scope<'ctx, 'a>, state: &State) -> Result<Option<StackValue>, ErrorKind> {
         let condition = self.0.codegen(scope, state)?.unwrap();

reid/src/codegen/scope.rs

@@ -2,13 +2,16 @@ use std::{cell::RefCell, collections::HashMap, mem, rc::Rc};
 
 use reid_lib::{
     builder::{InstructionValue, TypeValue},
-    debug_information::{DebugInformation, DebugProgramValue, DebugTypeValue},
+    debug_information::{DebugInformation, DebugLocation, DebugProgramValue, DebugTypeValue},
     Block, Context, Function, Instr, Module,
 };
 
 use crate::{
     lexer::FullToken,
-    mir::{pass::BinopKey, CustomTypeKey, SourceModuleId, TypeDefinition, TypeKind},
+    mir::{
+        pass::{AssociatedFunctionKey, BinopKey},
+        CustomTypeKey, SourceModuleId, TypeDefinition, TypeKind,
+    },
 };
 
 use super::{allocator::Allocator, ErrorKind, IntrinsicFunction, ModuleCodegen};
@@ -23,7 +26,8 @@ pub struct Scope<'ctx, 'scope> {
     pub(super) block: Block<'ctx>,
     pub(super) types: &'scope HashMap<TypeValue, TypeDefinition>,
     pub(super) type_values: &'scope HashMap<CustomTypeKey, TypeValue>,
-    pub(super) functions: &'scope HashMap<String, Function<'ctx>>,
+    pub(super) assoc_functions: &'scope HashMap<AssociatedFunctionKey, ScopeFunctionKind<'ctx>>,
+    pub(super) functions: &'scope HashMap<String, ScopeFunctionKind<'ctx>>,
     pub(super) binops: &'scope HashMap<BinopKey, StackBinopDefinition<'ctx>>,
     pub(super) stack_values: HashMap<String, StackValue>,
     pub(super) debug: Option<Debug<'ctx>>,
@@ -40,6 +44,7 @@ impl<'ctx, 'a> Scope<'ctx, 'a> {
             context: self.context,
             module: self.module,
             module_id: self.module_id,
+            assoc_functions: self.assoc_functions,
             functions: self.functions,
             types: self.types,
             type_values: self.type_values,
@@ -126,19 +131,20 @@ impl StackValueKind {
 pub struct StackBinopDefinition<'ctx> {
     pub(super) parameters: ((String, TypeKind), (String, TypeKind)),
     pub(super) return_ty: TypeKind,
-    pub(super) kind: StackBinopFunctionKind<'ctx>,
+    pub(super) kind: ScopeFunctionKind<'ctx>,
 }
 
-pub enum StackBinopFunctionKind<'ctx> {
+pub enum ScopeFunctionKind<'ctx> {
     UserGenerated(Function<'ctx>),
     Intrinsic(&'ctx Box<dyn IntrinsicFunction>),
+    IntrinsicOwned(Box<dyn IntrinsicFunction>),
 }
 
 impl<'ctx> StackBinopDefinition<'ctx> {
     pub fn codegen<'a>(
         &self,
-        lhs: &StackValue,
-        rhs: &StackValue,
+        lhs: StackValue,
+        rhs: StackValue,
         scope: &mut Scope<'ctx, 'a>,
     ) -> Result<StackValue, ErrorKind> {
         let (lhs, rhs) = if lhs.1 == self.parameters.0 .1 && rhs.1 == self.parameters.1 .1 {
@@ -146,15 +152,43 @@ impl<'ctx> StackBinopDefinition<'ctx> {
         } else {
             (rhs, lhs)
         };
-        match &self.kind {
-            StackBinopFunctionKind::UserGenerated(ir) => {
-                let instr = scope
-                    .block
-                    .build(Instr::FunctionCall(ir.value(), vec![lhs.instr(), rhs.instr()]))
-                    .unwrap();
-                Ok(StackValue(StackValueKind::Immutable(instr), self.return_ty.clone()))
+        let name = format!(
+            "binop.{}.{}.{}.call",
+            self.parameters.0 .1, self.parameters.1 .1, self.return_ty
+        );
+        self.kind.codegen(&name, &[lhs, rhs], &self.return_ty, None, scope)
     }
-            StackBinopFunctionKind::Intrinsic(fun) => fun.codegen(scope, &[&lhs, &rhs]),
+}
+
+impl<'ctx> ScopeFunctionKind<'ctx> {
+    pub fn codegen<'a>(
+        &self,
+        name: &str,
+        params: &[StackValue],
+        return_ty: &TypeKind,
+        location: Option<DebugLocation>,
+        scope: &mut Scope<'ctx, 'a>,
+    ) -> Result<StackValue, ErrorKind> {
+        match self {
+            ScopeFunctionKind::UserGenerated(function) => {
+                let val = scope
+                    .block
+                    .build_named(
+                        name,
+                        Instr::FunctionCall(function.value(), params.iter().map(|p| p.instr()).collect()),
+                    )
+                    .unwrap();
+
+                if let Some(debug) = &scope.debug {
+                    if let Some(location) = location {
+                        let location_val = debug.info.location(&debug.scope, location);
+                        val.with_location(&mut scope.block, location_val);
+                    }
+                }
+                Ok(StackValue(StackValueKind::Immutable(val), return_ty.clone()))
+            }
+            ScopeFunctionKind::Intrinsic(fun) => fun.codegen(scope, params),
+            ScopeFunctionKind::IntrinsicOwned(fun) => fun.codegen(scope, params),
         }
     }
 }

reid/src/mir/fmt.rs

@@ -2,7 +2,7 @@ use std::fmt::{Debug, Display, Write};
 
 use crate::pad_adapter::PadAdapter;
 
-use super::{typecheck::typerefs::TypeRefs, *};
+use super::*;
 
 impl Display for Context {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
@@ -49,6 +49,9 @@ impl Display for Module {
         for typedef in &self.typedefs {
             writeln!(inner_f, "{}", typedef)?;
         }
+        for (ty, fun) in &self.associated_functions {
+            writeln!(inner_f, "(Assoc {}) {}", ty, fun)?;
+        }
         for fun in &self.functions {
             writeln!(inner_f, "{}", fun)?;
         }
@@ -272,6 +275,11 @@ impl Display for ExprKind {
             ExprKind::Borrow(var_ref, true) => write!(f, "&mut {}", var_ref),
             ExprKind::Deref(var_ref) => write!(f, "*{}", var_ref),
             ExprKind::CastTo(expression, type_kind) => write!(f, "{} as {}", expression, type_kind),
+            ExprKind::AssociatedFunctionCall(type_kind, function_call) => {
+                Display::fmt(type_kind, f)?;
+                write!(f, "::")?;
+                Display::fmt(function_call, f)
+            }
         }
     }
 }

reid/src/mir/implement.rs

@@ -1,6 +1,6 @@
 use crate::util::maybe;
 
-use super::{pass::ScopeBinopDef, typecheck::typerefs::TypeRefs, *};
+use super::{typecheck::typerefs::TypeRefs, *};
 
 #[derive(Debug, Clone)]
 pub enum ReturnTypeOther {
@@ -443,6 +443,7 @@ impl Expression {
                 },
                 Err(_) => Ok((ReturnKind::Soft, type_kind.clone())),
             },
+            AssociatedFunctionCall(_, fcall) => fcall.return_type(),
         }
     }
 
@@ -461,6 +462,7 @@ impl Expression {
             ExprKind::FunctionCall(_) => None,
             ExprKind::If(_) => None,
             ExprKind::CastTo(expression, _) => expression.backing_var(),
+            ExprKind::AssociatedFunctionCall(..) => None,
         }
     }
 
@@ -499,6 +501,7 @@ impl Expression {
             ExprKind::Borrow(_, _) => None,
             ExprKind::Deref(_) => None,
             ExprKind::CastTo(expression, _) => expression.num_value()?,
+            ExprKind::AssociatedFunctionCall(..) => None,
         })
     }
 }

reid/src/mir/linker.rs

@@ -8,7 +8,6 @@ use std::{
 };
 
 use crate::{
-    codegen::scope,
     compile_module,
     error_raporting::{ErrorModules, ReidError},
     mir::{
@@ -254,7 +253,7 @@ impl<'map> Pass for LinkerPass<'map> {
                         binop.exported = true;
                         already_imported_binops.insert(binop_key);
                         match &binop.fn_kind {
-                            FunctionDefinitionKind::Local(block, metadata) => {
+                            FunctionDefinitionKind::Local(..) => {
                                 importer_module.binop_defs.push(BinopDefinition {
                                     lhs: binop.lhs.clone(),
                                     op: binop.op,

reid/src/mir/mod.rs

@@ -258,6 +258,7 @@ pub enum ExprKind {
     Literal(Literal),
     BinOp(BinaryOperator, Box<Expression>, Box<Expression>, TypeKind),
     FunctionCall(FunctionCall),
+    AssociatedFunctionCall(TypeKind, FunctionCall),
     If(IfExpression),
     Block(Block),
     Borrow(NamedVariableRef, bool),
@@ -292,6 +293,12 @@ pub struct FunctionDefinition {
     pub kind: FunctionDefinitionKind,
 }
 
+pub enum SelfKind {
+    Borrow,
+    MutBorrow,
+    None,
+}
+
 #[derive(Debug)]
 pub enum FunctionDefinitionKind {
     /// Actual definition block and surrounding signature range
@@ -393,6 +400,7 @@ pub struct Module {
     pub name: String,
     pub module_id: SourceModuleId,
     pub imports: Vec<Import>,
+    pub associated_functions: Vec<(TypeKind, FunctionDefinition)>,
     pub functions: Vec<FunctionDefinition>,
     pub typedefs: Vec<TypeDefinition>,
     pub binop_defs: Vec<BinopDefinition>,

reid/src/mir/pass.rs

@@ -5,7 +5,7 @@ use std::collections::HashMap;
 use std::convert::Infallible;
 use std::error::Error as STDError;
 
-use crate::codegen::intrinsics::form_intrinsic_binops;
+use crate::codegen::intrinsics::{form_intrinsic_binops, get_intrinsic_assoc_func};
 use crate::error_raporting::ReidError;
 
 use super::*;
@@ -123,7 +123,8 @@ pub type BinopMap = Storage<BinopKey, ScopeBinopDef>;
 pub struct Scope<Data: Clone + Default> {
     pub module_id: Option<SourceModuleId>,
     pub binops: BinopMap,
-    pub function_returns: Storage<String, ScopeFunction>,
+    pub associated_functions: Storage<AssociatedFunctionKey, ScopeFunction>,
+    pub functions: Storage<String, ScopeFunction>,
     pub variables: Storage<String, ScopeVariable>,
     pub types: Storage<CustomTypeKey, TypeDefinition>,
     /// Hard Return type of this scope, if inside a function
@@ -135,7 +136,8 @@ impl<Data: Clone + Default> Scope<Data> {
     pub fn inner(&self) -> Scope<Data> {
         Scope {
             module_id: self.module_id,
-            function_returns: self.function_returns.clone(),
+            associated_functions: self.associated_functions.clone(),
+            functions: self.functions.clone(),
             variables: self.variables.clone(),
             binops: self.binops.clone(),
             types: self.types.clone(),
@@ -167,6 +169,24 @@ impl<Data: Clone + Default> Scope<Data> {
             .find(|(key, def)| key.0 == typekey.0 && def.importer == Some(typekey.1))
             .map(|(_, v)| v))
     }
+
+    pub fn get_associated_function(&mut self, key: &AssociatedFunctionKey) -> Option<ScopeFunction> {
+        let func = self.associated_functions.get(key);
+        if let Some(func) = func {
+            Some(func.clone())
+        } else if let Some(func) = get_intrinsic_assoc_func(&key.0, &key.1) {
+            self.associated_functions.set(
+                key.clone(),
+                ScopeFunction {
+                    ret: func.return_type,
+                    params: func.parameters.iter().map(|(_, p)| p.clone()).collect(),
+                },
+            );
+            self.associated_functions.get(key).cloned()
+        } else {
+            None
+        }
+    }
 }
 
 #[derive(Clone, Debug)]
@@ -181,6 +201,9 @@ pub struct ScopeVariable {
     pub mutable: bool,
 }
 
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+pub struct AssociatedFunctionKey(pub TypeKind, pub String);
+
 #[derive(Clone, Debug, Eq)]
 pub struct BinopKey {
     pub params: (TypeKind, TypeKind),
@@ -389,7 +412,7 @@ impl Module {
 
         for function in &self.functions {
             scope
-                .function_returns
+                .functions
                 .set(
                     function.name.clone(),
                     ScopeFunction {
@@ -400,6 +423,19 @@ impl Module {
                 .ok();
         }
 
+        for (ty, function) in &self.associated_functions {
+            scope
+                .associated_functions
+                .set(
+                    AssociatedFunctionKey(ty.clone(), function.name.clone()),
+                    ScopeFunction {
+                        ret: function.return_type.clone(),
+                        params: function.parameters.iter().cloned().map(|v| v.1).collect(),
+                    },
+                )
+                .ok();
+        }
+
         pass.module(self, PassState::from(state, scope, Some(self.module_id)))?;
 
         for function in &mut self.functions {

reid/src/mir/typecheck/mod.rs

@@ -24,12 +24,16 @@ pub enum ErrorKind {
     TypesIncompatible(TypeKind, TypeKind),
     #[error("Variable not defined: {0}")]
     VariableNotDefined(String),
-    #[error("Function not defined: {0}")]
+    #[error("Function {0} not defined")]
     FunctionNotDefined(String),
+    #[error("Function {0} not defined for type {1}")]
+    AssocFunctionNotDefined(String, TypeKind),
     #[error("Expected a return type of {0}, got {1} instead")]
     ReturnTypeMismatch(TypeKind, TypeKind),
     #[error("Function {0} already defined {1}")]
     FunctionAlreadyDefined(String, ErrorTypedefKind),
+    #[error("Function {0}::{1} already defined {2}")]
+    AssocFunctionAlreadyDefined(TypeKind, String, ErrorTypedefKind),
     #[error("Variable already defined: {0}")]
     VariableAlreadyDefined(String),
     #[error("Variable {0} is not declared as mutable")]
@@ -170,7 +174,7 @@ impl TypeKind {
             return self.clone();
         }
         match (self, other) {
-            (TypeKind::Vague(Vague::Unknown), other) | (other, TypeKind::Vague(Vague::Unknown)) => {
+            (TypeKind::Vague(Vague::Unknown), _) | (_, TypeKind::Vague(Vague::Unknown)) => {
                 TypeKind::Vague(VagueType::Unknown)
             }
             (TypeKind::Vague(Vague::Integer), other) | (other, TypeKind::Vague(Vague::Integer)) => match other {

reid/src/mir/typecheck/typecheck.rs

@@ -68,6 +68,11 @@ impl<'t> Pass for TypeCheck<'t> {
             state.ok(res, binop.block_meta().unwrap_or(binop.signature()));
         }
 
+        for (_, function) in &mut module.associated_functions {
+            let res = function.typecheck(&self.refs, &mut state.inner());
+            state.ok(res, function.block_meta());
+        }
+
         for function in &mut module.functions {
             let res = function.typecheck(&self.refs, &mut state.inner());
             state.ok(res, function.block_meta());
@@ -443,7 +448,7 @@ impl Expression {
             ExprKind::FunctionCall(function_call) => {
                 let true_function = state
                     .scope
-                    .function_returns
+                    .functions
                     .get(&function_call.name)
                     .cloned()
                     .ok_or(ErrorKind::FunctionNotDefined(function_call.name.clone()));
@@ -724,6 +729,54 @@ impl Expression {
                 let expr = expression.typecheck(state, typerefs, HintKind::Default)?;
                 expr.resolve_ref(typerefs).cast_into(type_kind)
             }
+            ExprKind::AssociatedFunctionCall(type_kind, function_call) => {
+                let true_function = state
+                    .scope
+                    .get_associated_function(&pass::AssociatedFunctionKey(
+                        type_kind.clone(),
+                        function_call.name.clone(),
+                    ))
+                    .ok_or(ErrorKind::FunctionNotDefined(function_call.name.clone()));
+
+                if let Some(f) = state.ok(true_function, self.1) {
+                    let param_len_given = function_call.parameters.len();
+                    let param_len_expected = f.params.len();
+
+                    // Check that there are the same number of parameters given
+                    // as expected
+                    if param_len_given != param_len_expected {
+                        state.ok::<_, Infallible>(
+                            Err(ErrorKind::InvalidAmountParameters(
+                                function_call.name.clone(),
+                                param_len_given,
+                                param_len_expected,
+                            )),
+                            self.1,
+                        );
+                    }
+
+                    let true_params_iter = f
+                        .params
+                        .into_iter()
+                        .chain(iter::repeat(TypeKind::Vague(Vague::Unknown)));
+
+                    for (param, true_param_t) in function_call.parameters.iter_mut().zip(true_params_iter) {
+                        // Typecheck every param separately
+                        let param_res = param.typecheck(state, &typerefs, HintKind::Coerce(true_param_t.clone()));
+                        let param_t = state.or_else(param_res, TypeKind::Vague(Vague::Unknown), param.1);
+                        state.ok(param_t.narrow_into(&true_param_t), param.1);
+                    }
+
+                    // Make sure function return type is the same as the claimed
+                    // return type
+                    let ret_t = f.ret.narrow_into(&function_call.return_type.resolve_ref(typerefs))?;
+                    // Update typing to be more accurate
+                    function_call.return_type = ret_t.clone();
+                    Ok(ret_t.resolve_ref(typerefs))
+                } else {
+                    Ok(function_call.return_type.clone().resolve_ref(typerefs))
+                }
+            }
         }
     }
 }

reid/src/mir/typecheck/typeinference.rs

@@ -12,15 +12,15 @@ use std::{
 
 use crate::{
     mir::{
-        BinopDefinition, Block, CustomTypeKey, ExprKind, Expression, FunctionDefinition, FunctionDefinitionKind,
-        IfExpression, Module, ReturnKind, StmtKind, TypeKind, WhileStatement,
+        pass::AssociatedFunctionKey, BinopDefinition, Block, CustomTypeKey, ExprKind, Expression, FunctionDefinition,
+        FunctionDefinitionKind, IfExpression, Module, ReturnKind, StmtKind, TypeKind, WhileStatement,
     },
     util::try_all,
 };
 
 use super::{
     super::{
-        pass::{BinopKey, Pass, PassResult, PassState},
+        pass::{BinopKey, Pass, PassResult},
         TypeKind::*,
         VagueType::*,
     },
@@ -60,6 +60,29 @@ impl<'t> Pass for TypeInference<'t> {
             }
         }
 
+        let mut seen_assoc_functions = HashMap::new();
+        for (ty, function) in &mut module.associated_functions {
+            if let Some(kind) = seen_assoc_functions.get(&(ty.clone(), function.name.clone())) {
+                state.note_errors(
+                    &vec![ErrorKind::AssocFunctionAlreadyDefined(
+                        ty.clone(),
+                        function.name.clone(),
+                        *kind,
+                    )],
+                    function.signature(),
+                );
+            } else {
+                seen_assoc_functions.insert(
+                    (ty.clone(), function.name.clone()),
+                    match function.kind {
+                        FunctionDefinitionKind::Local(..) => ErrorTypedefKind::Local,
+                        FunctionDefinitionKind::Extern(..) => ErrorTypedefKind::Extern,
+                        FunctionDefinitionKind::Intrinsic(..) => ErrorTypedefKind::Intrinsic,
+                    },
+                );
+            }
+        }
+
         let mut seen_binops = HashSet::new();
         for binop in &module.binop_defs {
             let binop_key = BinopKey {
@@ -97,6 +120,11 @@ impl<'t> Pass for TypeInference<'t> {
             state.ok(res, binop.block_meta().unwrap_or(binop.signature()));
         }
 
+        for (_, function) in &mut module.associated_functions {
+            let res = function.infer_types(&self.refs, &mut state.inner());
+            state.ok(res, function.block_meta());
+        }
+
         for function in &mut module.functions {
             let res = function.infer_types(&self.refs, &mut state.inner());
             state.ok(res, function.block_meta());
@@ -365,7 +393,7 @@ impl Expression {
                 // Get function definition and types
                 let fn_call = state
                     .scope
-                    .function_returns
+                    .functions
                     .get(&function_call.name)
                     .ok_or(ErrorKind::FunctionNotDefined(function_call.name.clone()))?
                     .clone();
@@ -566,6 +594,32 @@ impl Expression {
                 expression.infer_types(state, type_refs)?;
                 Ok(type_refs.from_type(type_kind).unwrap())
             }
+            ExprKind::AssociatedFunctionCall(type_kind, function_call) => {
+                // Get function definition and types
+                let fn_call = state
+                    .scope
+                    .get_associated_function(&AssociatedFunctionKey(type_kind.clone(), function_call.name.clone()))
+                    .ok_or(ErrorKind::AssocFunctionNotDefined(
+                        function_call.name.clone(),
+                        type_kind.clone(),
+                    ))?
+                    .clone();
+
+                // Infer param expression types and narrow them to the
+                // expected function parameters (or Unknown types if too
+                // many were provided)
+                let true_params_iter = fn_call.params.iter().chain(iter::repeat(&Vague(Unknown)));
+
+                for (param_expr, param_t) in function_call.parameters.iter_mut().zip(true_params_iter) {
+                    let expr_res = param_expr.infer_types(state, type_refs);
+                    if let Some(mut param_ref) = state.ok(expr_res, param_expr.1) {
+                        param_ref.narrow(&mut type_refs.from_type(param_t).unwrap());
+                    }
+                }
+
+                // Provide function return type
+                Ok(type_refs.from_type(&fn_call.ret).unwrap())
+            }
         }
     }
 }

reid/src/mir/typecheck/typerefs.rs

@@ -4,15 +4,9 @@ use std::{
     rc::Rc,
 };
 
-use crate::{
-    ast::BinopDefinition,
-    mir::{pass::BinopMap, BinaryOperator, TypeKind, VagueType},
-};
+use crate::mir::{pass::BinopMap, BinaryOperator, TypeKind, VagueType};
 
-use super::{
-    super::pass::{BinopKey, ScopeBinopDef, Storage},
-    ErrorKind,
-};
+use super::{super::pass::ScopeBinopDef, ErrorKind};
 
 #[derive(Clone)]
 pub struct TypeRef<'scope>(pub(super) TypeIdRef, pub(super) &'scope ScopeTypeRefs<'scope>);

reid/tests/e2e.rs

@@ -1,10 +1,4 @@
-use std::{
-    alloc::System,
-    path::PathBuf,
-    process::Command,
-    thread,
-    time::{Duration, SystemTime},
-};
+use std::{path::PathBuf, process::Command, time::SystemTime};
 
 use reid::{
     compile_module,
@@ -149,3 +143,12 @@ fn array_short_compiles_well() {
 fn imported_type_compiles_well() {
     test(include_str!("../../examples/imported_type.reid"), "test", Some(0));
 }
+
+#[test]
+fn associated_functions() {
+    test(
+        include_str!("../../examples/associated_functions.reid"),
+        "test",
+        Some(32),
+    );
+}