Improve procedure group selection based on the minimum number of arguments

src/check_expr.cpp

@@ -4872,25 +4872,16 @@ bool is_expr_constant_zero(Ast *expr) {
 	return false;
 }
 
-
-CALL_ARGUMENT_CHECKER(check_call_arguments_internal) {
-	ast_node(ce, CallExpr, call);
-	GB_ASSERT(is_type_proc(proc_type));
-	proc_type = base_type(proc_type);
-	TypeProc *pt = &proc_type->Proc;
-
+isize get_procedure_param_count_excluding_defaults(Type *pt, isize *param_count_) {
+	GB_ASSERT(pt != nullptr);
+	GB_ASSERT(pt->kind == Type_Proc);
 	isize param_count = 0;
 	isize param_count_excluding_defaults = 0;
-	bool variadic = pt->variadic;
-	bool vari_expand = (ce->ellipsis.pos.line != 0);
-	i64 score = 0;
-	bool show_error = show_error_mode == CallArgumentMode_ShowErrors;
-
-
+	bool variadic = pt->Proc.variadic;
 	TypeTuple *param_tuple = nullptr;
 
-	if (pt->params != nullptr) {
-		param_tuple = &pt->params->Tuple;
+	if (pt->Proc.params != nullptr) {
+		param_tuple = &pt->Proc.params->Tuple;
 
 		param_count = param_tuple->variables.count;
 		if (variadic) {
@@ -4930,6 +4921,31 @@ CALL_ARGUMENT_CHECKER(check_call_arguments_internal) {
 		}
 	}
 
+	if (param_count_) *param_count_ = param_count;
+	return param_count_excluding_defaults;
+}
+
+
+CALL_ARGUMENT_CHECKER(check_call_arguments_internal) {
+	ast_node(ce, CallExpr, call);
+	GB_ASSERT(is_type_proc(proc_type));
+	proc_type = base_type(proc_type);
+	TypeProc *pt = &proc_type->Proc;
+
+	isize param_count = 0;
+	isize param_count_excluding_defaults = get_procedure_param_count_excluding_defaults(proc_type, &param_count);
+	bool variadic = pt->variadic;
+	bool vari_expand = (ce->ellipsis.pos.line != 0);
+	i64 score = 0;
+	bool show_error = show_error_mode == CallArgumentMode_ShowErrors;
+
+
+	TypeTuple *param_tuple = nullptr;
+	if (pt->params != nullptr) {
+		param_tuple = &pt->params->Tuple;
+	}
+
+
 	CallArgumentError err = CallArgumentError_None;
 	Type *final_proc_type = proc_type;
 	Entity *gen_entity = nullptr;
@@ -5602,7 +5618,37 @@ CallArgumentData check_call_arguments(CheckerContext *c, Operand *operand, Type
 	if (operand->mode == Addressing_ProcGroup) {
 		check_entity_decl(c, operand->proc_group, nullptr, nullptr);
 
-		Array<Entity *> procs = proc_group_entities(c, *operand);
+		auto procs = proc_group_entities_cloned(c, *operand);
+
+		if (procs.count > 1) {
+			isize max_arg_count = args.count;
+			for_array(i, args) {
+				// NOTE(bill): The only thing that may have multiple values
+				// will be a call expression (assuming `or_return` and `()` will be stripped)
+				Ast *arg = strip_or_return_expr(args[i]);
+				if (arg && arg->kind == Ast_CallExpr) {
+					max_arg_count = ISIZE_MAX;
+					break;
+				}
+			}
+
+			for (isize proc_index = 0; proc_index < procs.count; /**/) {
+				Entity *proc = procs[proc_index];
+				Type *pt = base_type(proc->type);
+				if (!(pt != nullptr && is_type_proc(pt))) {
+					continue;
+				}
+
+				isize param_count = 0;
+				isize param_count_excluding_defaults = get_procedure_param_count_excluding_defaults(pt, &param_count);
+
+				if (param_count_excluding_defaults > max_arg_count) {
+					array_unordered_remove(&procs, proc_index);
+				} else {
+					proc_index++;
+				}
+			}
+		}
 
 		if (procs.count == 1) {
 			Ast *ident = operand->expr;
@@ -5632,6 +5678,7 @@ CallArgumentData check_call_arguments(CheckerContext *c, Operand *operand, Type
 			return data;
 		}
 
+
 		Entity **lhs = nullptr;
 		isize lhs_count = -1;
 

src/check_type.cpp

@@ -1960,20 +1960,6 @@ bool check_procedure_type(CheckerContext *ctx, Type *type, Ast *proc_type_node,
 	if (params)  param_count  = params ->Tuple.variables.count;
 	if (results) result_count = results->Tuple.variables.count;
 
-	if (param_count > 0) {
-		for_array(i, params->Tuple.variables) {
-			Entity *param = params->Tuple.variables[i];
-			if (param->kind == Entity_Variable) {
-				ParameterValue pv = param->Variable.param_value;
-				if (pv.kind == ParameterValue_Constant &&
-				    pv.value.kind == ExactValue_Procedure) {
-					type->Proc.has_proc_default_values = true;
-					break;
-				}
-			}
-		}
-	}
-
 	if (result_count > 0) {
 		Entity *first = results->Tuple.variables[0];
 		type->Proc.has_named_results = first->token.string != "";

src/checker.cpp

@@ -2657,6 +2657,15 @@ Array<Entity *> proc_group_entities(CheckerContext *c, Operand o) {
 	return procs;
 }
 
+Array<Entity *> proc_group_entities_cloned(CheckerContext *c, Operand o) {
+	auto entities = proc_group_entities(c, o);
+	if (entities.count == 0) {
+		return {};
+	}
+	return array_clone(permanent_allocator(), entities);
+}
+
+
 
 
 void init_core_type_info(Checker *c) {

src/entity.cpp

@@ -115,6 +115,16 @@ struct ParameterValue {
 	};
 };
 
+bool has_parameter_value(ParameterValue const &param_value) {
+	if (param_value.kind != ParameterValue_Invalid) {
+		return true;
+	}
+	if (param_value.original_ast_expr != nullptr) {
+		return true;
+	}
+	return false;
+}
+
 enum EntityConstantFlags : u32 {
 	EntityConstantFlag_ImplicitEnumValue = 1<<0,
 };

src/types.cpp

@@ -186,7 +186,6 @@ struct TypeProc {
 	bool     c_vararg;
 	bool     is_polymorphic;
 	bool     is_poly_specialized;
-	bool     has_proc_default_values;
 	bool     has_named_results;
 	bool     diverging; // no return
 	bool     return_by_pointer;