core: Allocate exceptions at the beginning of function

Only one instance of exception is necessary, as exceptions will always
be initialized before being thrown.

nac3core/src/codegen/expr.rs

@@ -120,7 +120,7 @@ impl<'ctx, 'a> CodeGenContext<'ctx, 'a> {
                 let vals = ls.iter().map(|v| self.gen_symbol_val(generator, v, ty)).collect_vec();
                 let fields = vals.iter().map(|v| v.get_type()).collect_vec();
                 let ty = self.ctx.struct_type(&fields, false);
-                let ptr = self.builder.build_alloca(ty, "tuple");
+                let ptr = gen_var(self, ty.into(), Some("tuple")).unwrap();
                 let zero = self.ctx.i32_type().const_zero();
                 unsafe {
                     for (i, val) in vals.into_iter().enumerate() {
@@ -144,7 +144,7 @@ impl<'ctx, 'a> CodeGenContext<'ctx, 'a> {
                     _ => unreachable!("must be option type"),
                 };
                 let val = self.gen_symbol_val(generator, v, ty);
-                let ptr = self.builder.build_alloca(val.get_type(), "default_opt_some");
+                let ptr = generator.gen_var_alloc(self, val.get_type(), Some("default_opt_some")).unwrap();
                 self.builder.build_store(ptr, val);
                 ptr.into()
             }
@@ -365,6 +365,15 @@ impl<'ctx, 'a> CodeGenContext<'ctx, 'a> {
         let mut loc_params: Vec<BasicValueEnum<'ctx>> = Vec::new();
         let mut return_slot = None;
 
+        let loc = self.debug_info.0.create_debug_location(
+            self.ctx,
+            self.current_loc.row as u32,
+            self.current_loc.column as u32,
+            self.debug_info.2,
+            None,
+        );
+        self.builder.set_current_debug_location(loc);
+
         if fun.count_params() > 0 {
             let sret_id = Attribute::get_named_enum_kind_id("sret");
             let byref_id = Attribute::get_named_enum_kind_id("byref");
@@ -450,9 +459,14 @@ impl<'ctx, 'a> CodeGenContext<'ctx, 'a> {
         params: [Option<IntValue<'ctx>>; 3],
         loc: Location,
     ) {
-        let ty = self.get_llvm_type(generator, self.primitives.exception).into_pointer_type();
-        let zelf_ty: BasicTypeEnum = ty.get_element_type().into_struct_type().into();
-        let zelf = generator.gen_var_alloc(self, zelf_ty, Some("exn")).unwrap();
+        let zelf = if let Some(exception_val) = self.exception_val {
+            exception_val
+        } else {
+            let ty = self.get_llvm_type(generator, self.primitives.exception).into_pointer_type();
+            let zelf_ty: BasicTypeEnum = ty.get_element_type().into_struct_type().into();
+            let zelf = generator.gen_var_alloc(self, zelf_ty, Some("exn")).unwrap();
+            self.exception_val.insert(zelf).to_owned()
+        };
         let int32 = self.ctx.i32_type();
         let zero = int32.const_zero();
         unsafe {
@@ -655,6 +669,7 @@ pub fn gen_call<'ctx, 'a, G: CodeGenerator>(
     let key;
     let param_vals;
     let is_extern;
+
     let symbol = {
         // make sure this lock guard is dropped at the end of this scope...
         let def = definition.read();
@@ -1648,6 +1663,10 @@ pub fn gen_expr<'ctx, 'a, G: CodeGenerator>(
                             _ => unreachable!("option must be static or ptr")
                         }
                     }
+
+                    // Reset current_loc back to the location of the call
+                    ctx.current_loc = expr.location;
+
                     return Ok(generator
                         .gen_call(
                             ctx,

nac3core/src/codegen/mod.rs

@@ -146,6 +146,7 @@ pub struct CodeGenContext<'ctx, 'a> {
     pub const_strings: HashMap<String, BasicValueEnum<'ctx>>,
     // stores the alloca for variables
     pub init_bb: BasicBlock<'ctx>,
+    pub exception_val: Option<PointerValue<'ctx>>,
     /// The header and exit basic blocks of a loop in this context. See
     /// https://llvm.org/docs/LoopTerminology.html for explanation of these terminology.
     pub loop_target: Option<(BasicBlock<'ctx>, BasicBlock<'ctx>)>,
@@ -802,6 +803,7 @@ pub fn gen_func_impl<'ctx, G: CodeGenerator, F: FnOnce(&mut G, &mut CodeGenConte
         type_cache,
         primitives,
         init_bb,
+        exception_val: Default::default(),
         builder,
         module,
         unifier,

nac3core/src/toplevel/builtins.rs

@@ -710,7 +710,7 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
                     });
                     let start = start.unwrap_or_else(|| int32.const_zero().into());
                     let ty = int32.array_type(3);
-                    let ptr = ctx.builder.build_alloca(ty, "range");
+                    let ptr = generator.gen_var_alloc(ctx, ty.into(), Some("range")).unwrap();
                     unsafe {
                         let a = ctx.builder.build_in_bounds_gep(ptr, &[zero, zero], "start");
                         let b = ctx.builder.build_in_bounds_gep(
@@ -1236,7 +1236,7 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
                 |ctx, _, fun, args, generator| {
                     let arg_ty = fun.0.args[0].ty;
                     let arg_val = args[0].1.clone().to_basic_value_enum(ctx, generator, arg_ty)?;
-                    let alloca = ctx.builder.build_alloca(arg_val.get_type(), "alloca_some");
+                    let alloca = generator.gen_var_alloc(ctx, arg_val.get_type(), Some("alloca_some")).unwrap();
                     ctx.builder.build_store(alloca, arg_val);
                     Ok(Some(alloca.into()))
                 },