nac3core/src/codegen/expr.rs

@@ -1,8 +1,9 @@
 use std::{collections::HashMap, convert::TryInto, iter::once};
 
+use super::{get_llvm_type, CodeGenContext};
 use crate::{
     symbol_resolver::SymbolValue,
-    top_level::{CodeGenContext, DefinitionId, TopLevelDef},
+    top_level::{DefinitionId, TopLevelDef},
     typecheck::typedef::{FunSignature, Type, TypeEnum},
 };
 use inkwell::{
@@ -48,45 +49,6 @@ impl<'ctx> CodeGenContext<'ctx> {
         index
     }
 
-    pub fn get_llvm_type(&mut self, ty: Type) -> BasicTypeEnum<'ctx> {
-        use TypeEnum::*;
-        // we assume the type cache should already contain primitive types,
-        // and they should be passed by value instead of passing as pointer.
-        self.type_cache.get(&ty).cloned().unwrap_or_else(|| match &*self.unifier.get_ty(ty) {
-            TObj { obj_id, fields, .. } => {
-                // a struct with fields in the order of declaration
-                let defs = self.top_level.definitions.read();
-                let definition = defs.get(obj_id.0).unwrap();
-                let ty = if let TopLevelDef::Class { fields: fields_list, .. } = &*definition.read()
-                {
-                    let fields = fields.borrow();
-                    let fields =
-                        fields_list.iter().map(|f| self.get_llvm_type(fields[&f.0])).collect_vec();
-                    self.ctx.struct_type(&fields, false).ptr_type(AddressSpace::Generic).into()
-                } else {
-                    unreachable!()
-                };
-                ty
-            }
-            TTuple { ty } => {
-                // a struct with fields in the order present in the tuple
-                let fields = ty.iter().map(|ty| self.get_llvm_type(*ty)).collect_vec();
-                self.ctx.struct_type(&fields, false).ptr_type(AddressSpace::Generic).into()
-            }
-            TList { ty } => {
-                // a struct with an integer and a pointer to an array
-                let element_type = self.get_llvm_type(*ty);
-                let fields = [
-                    self.ctx.i32_type().into(),
-                    element_type.ptr_type(AddressSpace::Generic).into(),
-                ];
-                self.ctx.struct_type(&fields, false).ptr_type(AddressSpace::Generic).into()
-            }
-            TVirtual { .. } => unimplemented!(),
-            _ => unreachable!(),
-        })
-    }
-
     fn gen_symbol_val(&mut self, val: &SymbolValue) -> BasicValueEnum<'ctx> {
         match val {
             SymbolValue::I32(v) => self.ctx.i32_type().const_int(*v as u64, true).into(),
@@ -113,6 +75,10 @@ impl<'ctx> CodeGenContext<'ctx> {
         }
     }
 
+    pub fn get_llvm_type(&mut self, ty: Type) -> BasicTypeEnum<'ctx> {
+        get_llvm_type(self.ctx, &mut self.unifier, self.top_level, &mut self.type_cache, ty)
+    }
+
     fn gen_call(
         &mut self,
         obj: Option<(Type, BasicValueEnum<'ctx>)>,

nac3core/src/codegen/mod.rs

@@ -1,2 +1,197 @@
+use crate::{
+    symbol_resolver::SymbolResolver,
+    top_level::{TopLevelContext, TopLevelDef},
+    typecheck::{
+        type_inferencer::PrimitiveStore,
+        typedef::{FunSignature, Type, TypeEnum, Unifier},
+    },
+};
+use inkwell::{
+    basic_block::BasicBlock,
+    builder::Builder,
+    context::Context,
+    module::Module,
+    types::{BasicType, BasicTypeEnum},
+    values::PointerValue,
+    AddressSpace,
+};
+use itertools::Itertools;
+use rayon::current_thread_index;
+use rustpython_parser::ast::{Stmt, StmtKind};
+use std::collections::HashMap;
+use std::sync::Arc;
+
 mod expr;
 mod stmt;
+
+pub struct CodeGenContext<'ctx> {
+    pub ctx: &'ctx Context,
+    pub builder: Builder<'ctx>,
+    pub module: Module<'ctx>,
+    pub top_level: &'ctx TopLevelContext,
+    pub unifier: Unifier,
+    pub resolver: Box<dyn SymbolResolver>,
+    pub var_assignment: HashMap<String, PointerValue<'ctx>>,
+    pub type_cache: HashMap<Type, BasicTypeEnum<'ctx>>,
+    pub primitives: PrimitiveStore,
+    // stores the alloca for variables
+    pub init_bb: BasicBlock<'ctx>,
+    // where continue and break should go to respectively
+    // the first one is the test_bb, and the second one is bb after the loop
+    pub loop_bb: Option<(BasicBlock<'ctx>, BasicBlock<'ctx>)>,
+}
+
+pub struct CodeGenTask {
+    pub subst: Vec<(Type, Type)>,
+    pub symbol_name: String,
+    pub signature: FunSignature,
+    pub body: Stmt<Option<Type>>,
+    pub unifier_index: usize,
+    pub resolver: Box<dyn SymbolResolver>,
+}
+
+fn get_llvm_type<'ctx>(
+    ctx: &'ctx Context,
+    unifier: &mut Unifier,
+    top_level: &TopLevelContext,
+    type_cache: &mut HashMap<Type, BasicTypeEnum<'ctx>>,
+    ty: Type,
+) -> BasicTypeEnum<'ctx> {
+    use TypeEnum::*;
+    // we assume the type cache should already contain primitive types,
+    // and they should be passed by value instead of passing as pointer.
+    type_cache.get(&ty).cloned().unwrap_or_else(|| match &*unifier.get_ty(ty) {
+        TObj { obj_id, fields, .. } => {
+            // a struct with fields in the order of declaration
+            let defs = top_level.definitions.read();
+            let definition = defs.get(obj_id.0).unwrap();
+            let ty = if let TopLevelDef::Class { fields: fields_list, .. } = &*definition.read() {
+                let fields = fields.borrow();
+                let fields = fields_list
+                    .iter()
+                    .map(|f| get_llvm_type(ctx, unifier, top_level, type_cache, fields[&f.0]))
+                    .collect_vec();
+                ctx.struct_type(&fields, false).ptr_type(AddressSpace::Generic).into()
+            } else {
+                unreachable!()
+            };
+            ty
+        }
+        TTuple { ty } => {
+            // a struct with fields in the order present in the tuple
+            let fields = ty
+                .iter()
+                .map(|ty| get_llvm_type(ctx, unifier, top_level, type_cache, *ty))
+                .collect_vec();
+            ctx.struct_type(&fields, false).ptr_type(AddressSpace::Generic).into()
+        }
+        TList { ty } => {
+            // a struct with an integer and a pointer to an array
+            let element_type = get_llvm_type(ctx, unifier, top_level, type_cache, *ty);
+            let fields =
+                [ctx.i32_type().into(), element_type.ptr_type(AddressSpace::Generic).into()];
+            ctx.struct_type(&fields, false).ptr_type(AddressSpace::Generic).into()
+        }
+        TVirtual { .. } => unimplemented!(),
+        _ => unreachable!(),
+    })
+}
+
+pub fn gen_func(task: CodeGenTask, top_level_ctx: Arc<TopLevelContext>) {
+    // unwrap_or(0) is for unit tests without using rayon
+    let thread_id = current_thread_index().unwrap_or(0);
+    let (mut unifier, primitives) = {
+        let unifiers = top_level_ctx.unifiers.read();
+        let (unifier, primitives) = &unifiers[task.unifier_index];
+        (Unifier::from_shared_unifier(unifier), *primitives)
+    };
+    let contexts = top_level_ctx.conetexts.read();
+    let context = contexts[thread_id].lock();
+
+    for (a, b) in task.subst.iter() {
+        // this should be unification between variables and concrete types
+        // and should not cause any problem...
+        unifier.unify(*a, *b).unwrap();
+    }
+
+    // rebuild primitive store with unique representatives
+    let primitives = PrimitiveStore {
+        int32: unifier.get_representative(primitives.int32),
+        int64: unifier.get_representative(primitives.int64),
+        float: unifier.get_representative(primitives.float),
+        bool: unifier.get_representative(primitives.bool),
+        none: unifier.get_representative(primitives.none),
+    };
+
+    let mut type_cache: HashMap<_, _> = [
+        (primitives.int32, context.i32_type().into()),
+        (primitives.int64, context.i64_type().into()),
+        (primitives.float, context.f64_type().into()),
+        (primitives.bool, context.bool_type().into()),
+    ]
+    .iter()
+    .cloned()
+    .collect();
+
+    let params = task
+        .signature
+        .args
+        .iter()
+        .map(|arg| {
+            get_llvm_type(&context, &mut unifier, top_level_ctx.as_ref(), &mut type_cache, arg.ty)
+        })
+        .collect_vec();
+
+    let fn_type = if unifier.unioned(task.signature.ret, primitives.none) {
+        context.void_type().fn_type(&params, false)
+    } else {
+        get_llvm_type(
+            &context,
+            &mut unifier,
+            top_level_ctx.as_ref(),
+            &mut type_cache,
+            task.signature.ret,
+        )
+        .fn_type(&params, false)
+    };
+
+    let builder = context.create_builder();
+    let module = context.create_module(&task.symbol_name);
+    let fn_val = module.add_function(&task.symbol_name, fn_type, None);
+    let init_bb = context.append_basic_block(fn_val, "init");
+    builder.position_at_end(init_bb);
+    let body_bb = context.append_basic_block(fn_val, "body");
+
+    let mut var_assignment = HashMap::new();
+    for (n, arg) in task.signature.args.iter().enumerate() {
+        let param = fn_val.get_nth_param(n as u32).unwrap();
+        let alloca = builder.build_alloca(
+            get_llvm_type(&context, &mut unifier, top_level_ctx.as_ref(), &mut type_cache, arg.ty),
+            &arg.name,
+        );
+        builder.build_store(alloca, param);
+        var_assignment.insert(arg.name.clone(), alloca);
+    }
+    builder.build_unconditional_branch(body_bb);
+    builder.position_at_end(body_bb);
+
+    let mut code_gen_context = CodeGenContext {
+        ctx: &context,
+        resolver: task.resolver,
+        top_level: top_level_ctx.as_ref(),
+        loop_bb: None,
+        var_assignment,
+        type_cache,
+        primitives,
+        init_bb,
+        builder,
+        module,
+        unifier,
+    };
+
+    if let StmtKind::FunctionDef { body, .. } = &task.body.node {
+        for stmt in body.iter() {
+            code_gen_context.gen_stmt(stmt);
+        }
+    }
+}

nac3core/src/codegen/stmt.rs

@@ -1,12 +1,14 @@
-use crate::{top_level::CodeGenContext, typecheck::typedef::Type};
-use inkwell::values::{BasicValueEnum, PointerValue};
+use super::CodeGenContext;
+use crate::typecheck::typedef::Type;
+use inkwell::values::{BasicValue, BasicValueEnum, PointerValue};
 use rustpython_parser::ast::{Expr, ExprKind, Stmt, StmtKind};
 
 impl<'ctx> CodeGenContext<'ctx> {
     fn gen_var(&mut self, ty: Type) -> PointerValue<'ctx> {
         // put the alloca in init block
         let current = self.builder.get_insert_block().unwrap();
-        self.builder.position_at_end(self.init_bb);
+        // position before the last branching instruction...
+        self.builder.position_before(&self.init_bb.get_last_instruction().unwrap());
         let ty = self.get_llvm_type(ty);
         let ptr = self.builder.build_alloca(ty, "tmp");
         self.builder.position_at_end(current);
@@ -71,6 +73,11 @@ impl<'ctx> CodeGenContext<'ctx> {
             StmtKind::Expr { value } => {
                 self.gen_expr(&value);
             }
+            StmtKind::Return { value } => {
+                let value = value.as_ref().map(|v| self.gen_expr(&v));
+                let value = value.as_ref().map(|v| v as &dyn BasicValue);
+                self.builder.build_return(value);
+            }
             StmtKind::AnnAssign { target, value, .. } => {
                 if let Some(value) = value {
                     let value = self.gen_expr(&value);

nac3core/src/top_level.rs

@@ -3,11 +3,8 @@ use std::{collections::HashMap, sync::Arc};
 use super::typecheck::type_inferencer::PrimitiveStore;
 use super::typecheck::typedef::{SharedUnifier, Type, TypeEnum, Unifier};
 use crate::symbol_resolver::SymbolResolver;
-use inkwell::{
-    basic_block::BasicBlock, builder::Builder, context::Context, module::Module,
-    types::BasicTypeEnum, values::PointerValue,
-};
-use parking_lot::RwLock;
+use inkwell::context::Context;
+use parking_lot::{Mutex, RwLock};
 use rustpython_parser::ast::{self, Stmt};
 
 #[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy)]
@@ -49,33 +46,10 @@ pub enum TopLevelDef {
     },
 }
 
-pub struct CodeGenTask {
-    pub subst: HashMap<usize, Type>,
-    pub symbol_name: String,
-    pub body: Stmt<Option<Type>>,
-    pub unifier: SharedUnifier,
-}
-
 pub struct TopLevelContext {
     pub definitions: Arc<RwLock<Vec<RwLock<TopLevelDef>>>>,
-    pub unifiers: Arc<RwLock<Vec<SharedUnifier>>>,
-}
-
-pub struct CodeGenContext<'ctx> {
-    pub ctx: &'ctx Context,
-    pub builder: Builder<'ctx>,
-    pub module: Module<'ctx>,
-    pub top_level: &'ctx TopLevelContext,
-    pub unifier: Unifier,
-    pub resolver: Box<dyn SymbolResolver>,
-    pub var_assignment: HashMap<String, PointerValue<'ctx>>,
-    pub type_cache: HashMap<Type, BasicTypeEnum<'ctx>>,
-    pub primitives: PrimitiveStore,
-    // stores the alloca for variables
-    pub init_bb: BasicBlock<'ctx>,
-    // where continue and break should go to respectively
-    // the first one is the test_bb, and the second one is bb after the loop
-    pub loop_bb: Option<(BasicBlock<'ctx>, BasicBlock<'ctx>)>,
+    pub unifiers: Arc<RwLock<Vec<(SharedUnifier, PrimitiveStore)>>>,
+    pub conetexts: Arc<RwLock<Vec<Mutex<Context>>>>,
 }
 
 pub struct TopLevelDefInfo<'a> {