handle global variables

src/basic_symbol_resolver.rs

@@ -1,6 +1,14 @@
-use nac3core::nac3parser::ast::{self, StrRef};
+use std::{
+    collections::{HashMap, HashSet},
+    sync::Arc,
+};
+
+use parking_lot::{Mutex, RwLock};
+
 use nac3core::{
-    codegen::CodeGenContext,
+    codegen::{CodeGenContext, CodeGenerator},
+    inkwell::{module::Linkage, values::BasicValue},
+    nac3parser::ast::{self, StrRef},
     symbol_resolver::{SymbolResolver, SymbolValue, ValueEnum},
     toplevel::{DefinitionId, TopLevelDef},
     typecheck::{
@@ -8,9 +16,6 @@ use nac3core::{
         typedef::{Type, Unifier},
     },
 };
-use parking_lot::{Mutex, RwLock};
-use std::collections::HashSet;
-use std::{collections::HashMap, sync::Arc};
 
 pub struct ResolverInternal {
     pub id_to_type: Mutex<HashMap<StrRef, Type>>,
@@ -45,9 +50,9 @@ impl SymbolResolver for Resolver {
 
     fn get_symbol_type(
         &self,
-        _: &mut Unifier,
+        unifier: &mut Unifier,
         _: &[Arc<RwLock<TopLevelDef>>],
-        _: &PrimitiveStore,
+        primitives: &PrimitiveStore,
         str: StrRef,
     ) -> Result<Type, String> {
         self.0
@@ -55,15 +60,41 @@ impl SymbolResolver for Resolver {
             .lock()
             .get(&str)
             .copied()
+            .or_else(|| {
+                self.0
+                    .module_globals
+                    .lock()
+                    .get(&str)
+                    .cloned()
+                    .map(|v| v.get_type(primitives, unifier))
+            })
             .ok_or(format!("cannot get type of {str}"))
     }
 
     fn get_symbol_value<'ctx>(
         &self,
-        _: StrRef,
-        _: &mut CodeGenContext<'ctx, '_>,
+        str: StrRef,
+        ctx: &mut CodeGenContext<'ctx, '_>,
+        generator: &mut dyn CodeGenerator,
     ) -> Option<ValueEnum<'ctx>> {
-        unimplemented!()
+        self.0.module_globals.lock().get(&str).cloned().map(|v| {
+            ctx.module
+                .get_global(&str.to_string())
+                .unwrap_or_else(|| {
+                    let ty = v.get_type(&ctx.primitives, &mut ctx.unifier);
+
+                    let init_val = ctx.gen_symbol_val(generator, &v, ty);
+                    let llvm_ty = init_val.get_type();
+
+                    let global = ctx.module.add_global(llvm_ty, None, &str.to_string());
+                    global.set_linkage(Linkage::LinkOnceAny);
+                    global.set_initializer(&init_val);
+
+                    global
+                })
+                .as_basic_value_enum()
+                .into()
+        })
     }
 
     fn get_identifier_def(&self, id: StrRef) -> Result<DefinitionId, HashSet<String>> {

src/main.rs

@@ -199,6 +199,36 @@ fn handle_assignment_pattern(
     }
 }
 
+fn handle_global_var(
+    target: &nac3parser::ast::Expr,
+    value: Option<&nac3parser::ast::Expr>,
+    resolver: &(dyn nac3core::symbol_resolver::SymbolResolver + Send + Sync),
+    internal_resolver: &ResolverInternal,
+) -> Result<(), String> {
+    let nac3parser::ast::ExprKind::Name { id, .. } = target.node else {
+        return Err(format!(
+            "global variable declaration must be an identifier (at {})",
+            target.location,
+        ));
+    };
+
+    let Some(value) = value else {
+        return Err(format!(
+            "global variable `{id}` must be initialized in its definition"
+        ));
+    };
+
+    if let Ok(val) = toplevel::helper::parse_parameter_default_value(value, resolver) {
+        internal_resolver.add_module_global(id, val);
+        Ok(())
+    } else {
+        Err(format!(
+            "failed to evaluate this expression `{:?}` as a constant at {}",
+            target.node, target.location,
+        ))
+    }
+}
+
 fn compile(code: &String, run_symbol: &String, output_filename: &Path) -> Result<(), String> {
     let mut target_machine_options = codegen::CodeGenTargetMachineOptions::from_host();
     target_machine_options.reloc_mode = inkwell::targets::RelocMode::PIC;
@@ -241,34 +271,54 @@ fn compile(code: &String, run_symbol: &String, output_filename: &Path) -> Result
             }
         };
     for mut stmt in parser_result {
-        if let nac3parser::ast::StmtKind::Assign { targets, value, .. } = stmt.node {
-            let def_list = composer.extract_def_list();
-            let unifier = &mut composer.unifier;
-            let primitives = &composer.primitives_ty;
-            handle_assignment_pattern(
-                &targets,
-                &value,
-                resolver.as_ref(),
-                internal_resolver.as_ref(),
-                &def_list,
-                unifier,
-                primitives,
-            )?;
-        } else {
-            if let nac3parser::ast::StmtKind::FunctionDef { name, .. } = &mut stmt.node {
-                if name.to_string() == "run" {
-                    *name = run_symbol.as_str().into();
-                }
+        match stmt.node {
+            nac3parser::ast::StmtKind::Assign { targets, value, .. } => {
+                let def_list = composer.extract_def_list();
+                let unifier = &mut composer.unifier;
+                let primitives = &composer.primitives_ty;
+                handle_assignment_pattern(
+                    &targets,
+                    &value,
+                    resolver.as_ref(),
+                    internal_resolver.as_ref(),
+                    &def_list,
+                    unifier,
+                    primitives,
+                )?;
             }
-            match composer.register_top_level(stmt, Some(resolver.clone()), "__main__", true) {
-                Ok((name, def_id, ty)) => {
-                    internal_resolver.add_id_def(name, def_id);
-                    if let Some(ty) = ty {
-                        internal_resolver.add_id_type(name, ty);
+            nac3parser::ast::StmtKind::AnnAssign {
+                ref target,
+                ref value,
+                ..
+            } => {
+                handle_global_var(
+                    &target,
+                    value.as_ref().map(Box::as_ref),
+                    resolver.as_ref(),
+                    internal_resolver.as_ref(),
+                )?;
+
+                let (name, def_id, _) = composer
+                    .register_top_level(stmt, Some(resolver.clone()), "__main__", true)
+                    .unwrap();
+                internal_resolver.add_id_def(name, def_id);
+            }
+            _ => {
+                if let nac3parser::ast::StmtKind::FunctionDef { name, .. } = &mut stmt.node {
+                    if name.to_string() == "run" {
+                        *name = run_symbol.as_str().into();
                     }
                 }
-                Err(err) => {
-                    return Err(format!("composer error: {}", err));
+                match composer.register_top_level(stmt, Some(resolver.clone()), "__main__", true) {
+                    Ok((name, def_id, ty)) => {
+                        internal_resolver.add_id_def(name, def_id);
+                        if let Some(ty) = ty {
+                            internal_resolver.add_id_type(name, ty);
+                        }
+                    }
+                    Err(err) => {
+                        return Err(format!("composer error: {}", err));
+                    }
                 }
             }
         }