checker: reduce allocations part 2 (vlang#22434)

vlib/v/checker/autocomplete.v

@@ -81,7 +81,7 @@ fn (mut c Checker) ident_autocomplete(node ast.Ident) {
 	}
 }
 
-fn build_method_summary(method ast.Fn) string {
+fn build_method_summary(method &ast.Fn) string {
 	mut s := method.name + '('
 	for i, param in method.params {
 		s += param.name

vlib/v/checker/check_types.v

@@ -928,7 +928,7 @@ fn (g Checker) get_generic_array_fixed_element_type(array ast.ArrayFixed) ast.Ty
 	return typ
 }
 
-fn (mut c Checker) infer_fn_generic_types(func ast.Fn, mut node ast.CallExpr) {
+fn (mut c Checker) infer_fn_generic_types(func &ast.Fn, mut node ast.CallExpr) {
 	mut inferred_types := []ast.Type{}
 	mut arg_inferred := []int{}
 	for gi, gt_name in func.generic_names {

vlib/v/checker/checker.v

@@ -3713,7 +3713,7 @@ struct ACFieldMethod {
 	typ  string
 }
 
-fn (mut c Checker) resolve_var_fn(func ast.Fn, mut node ast.Ident, name string) ast.Type {
+fn (mut c Checker) resolve_var_fn(func &ast.Fn, mut node ast.Ident, name string) ast.Type {
 	mut fn_type := ast.new_type(c.table.find_or_register_fn_type(func, false, true))
 	if func.generic_names.len > 0 {
 		concrete_types := node.concrete_types.map(c.unwrap_generic(it))

vlib/v/checker/comptime.v

@@ -597,7 +597,7 @@ fn (mut c Checker) eval_comptime_const_expr(expr ast.Expr, nlevel int) ?ast.Comp
 	return none
 }
 
-fn (mut c Checker) verify_vweb_params_for_method(node ast.Fn) (bool, int, int) {
+fn (mut c Checker) verify_vweb_params_for_method(node &ast.Fn) (bool, int, int) {
 	margs := node.params.len - 1 // first arg is the receiver/this
 	// if node.attrs.len == 0 || (node.attrs.len == 1 && node.attrs[0].name == 'post') {
 	if node.attrs.len == 0 {

vlib/v/checker/fn.v

@@ -693,7 +693,7 @@ fn (mut c Checker) call_expr(mut node ast.CallExpr) ast.Type {
 	return typ
 }
 
-fn (mut c Checker) builtin_args(mut node ast.CallExpr, fn_name string, func ast.Fn) {
+fn (mut c Checker) builtin_args(mut node ast.CallExpr, fn_name string, func &ast.Fn) {
 	c.inside_interface_deref = true
 	c.expected_type = ast.string_type
 	if !(node.language != .js && node.args[0].expr is ast.CallExpr) {
@@ -1690,25 +1690,33 @@ fn (mut c Checker) fn_call(mut node ast.CallExpr, mut continue_check &bool) ast.
 }
 
 // register_trace_call registers the wrapper funcs for calling funcs for callstack feature
-fn (mut c Checker) register_trace_call(node ast.CallExpr, func ast.Fn) {
-	is_traceable := (c.pref.is_callstack || c.pref.is_trace) && c.table.cur_fn != unsafe { nil }
-		&& node.language == .v && c.file.imports.any(it.mod == 'v.debug')
-		&& node.name !in ['v.debug.callstack', 'v.debug.add_after_call', 'v.debug.add_before_call', 'v.debug.remove_after_call', 'v.debug.remove_before_call']
-	if is_traceable {
-		hash_fn, fn_name := c.table.get_trace_fn_name(c.table.cur_fn, node)
-		calling_fn := if func.is_method {
-			'${c.table.type_to_str(c.unwrap_generic(node.left_type))}_${fn_name}'
-		} else {
-			fn_name
-		}
-		c.table.cur_fn.trace_fns[hash_fn] = ast.FnTrace{
-			name:        calling_fn
-			file:        c.file.path
-			line:        node.pos.line_nr + 1
-			return_type: node.return_type
-			func:        &func
-			is_fn_var:   node.is_fn_var
+fn (mut c Checker) register_trace_call(node &ast.CallExpr, func &ast.Fn) {
+	if !(c.pref.is_callstack || c.pref.is_trace) || c.table.cur_fn == unsafe { nil }
+		|| node.language != .v {
+		return
+	}
+	if node.name in ['v.debug.callstack', 'v.debug.add_after_call', 'v.debug.add_before_call',
+		'v.debug.remove_after_call', 'v.debug.remove_before_call'] {
+		return
+	}
+	if !c.file.imports.any(it.mod == 'v.debug') {
+		return
+	}
+	hash_fn, fn_name := c.table.get_trace_fn_name(c.table.cur_fn, node)
+	calling_fn := if func.is_method {
+		'${c.table.type_to_str(c.unwrap_generic(node.left_type))}_${fn_name}'
+	} else {
+		fn_name
+	}
+	c.table.cur_fn.trace_fns[hash_fn] = ast.FnTrace{
+		name:        calling_fn
+		file:        c.file.path
+		line:        node.pos.line_nr + 1
+		return_type: node.return_type
+		func:        &ast.Fn{
+			...func
 		}
+		is_fn_var:   node.is_fn_var
 	}
 }
 
@@ -1741,7 +1749,7 @@ fn (mut c Checker) is_generic_expr(node ast.Expr) bool {
 	}
 }
 
-fn (mut c Checker) resolve_comptime_args(func ast.Fn, node_ ast.CallExpr, concrete_types []ast.Type) map[int]ast.Type {
+fn (mut c Checker) resolve_comptime_args(func &ast.Fn, node_ ast.CallExpr, concrete_types []ast.Type) map[int]ast.Type {
 	mut comptime_args := map[int]ast.Type{}
 	has_dynamic_vars := (c.table.cur_fn != unsafe { nil } && c.table.cur_fn.generic_names.len > 0)
 		|| c.comptime.comptime_for_field_var != ''
@@ -1890,7 +1898,7 @@ fn (mut c Checker) resolve_comptime_args(func ast.Fn, node_ ast.CallExpr, concre
 	return comptime_args
 }
 
-fn (mut c Checker) resolve_fn_generic_args(func ast.Fn, mut node ast.CallExpr) []ast.Type {
+fn (mut c Checker) resolve_fn_generic_args(func &ast.Fn, mut node ast.CallExpr) []ast.Type {
 	mut concrete_types := node.concrete_types.map(c.unwrap_generic(it))
 
 	// dynamic values from comptime and generic parameters