Initial project import

tools/v/vlib/builtin/builtin.v

@@ -0,0 +1,58 @@
+// Copyright (c) 2019-2023 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+@[has_globals]
+module builtin
+
+// isnil returns true if an object is nil (only for C objects).
+@[inline]
+pub fn isnil(v voidptr) bool {
+	return v == 0
+}
+
+struct VCastTypeIndexName {
+	tindex int
+	tname  string
+}
+
+// will be filled in cgen
+__global as_cast_type_indexes []VCastTypeIndexName
+
+// SliceIndex describes one overloaded `[]` index or slice part.
+pub struct SliceIndex {
+pub:
+	is_range bool
+	value    int
+	low      int
+	high     int
+	has_low  bool
+	has_high bool
+}
+
+@[direct_array_access]
+fn __as_cast(obj voidptr, obj_type int, expected_type int) voidptr {
+	if obj_type != expected_type {
+		mut obj_name := as_cast_type_indexes[0].tname.clone()
+		mut expected_name := as_cast_type_indexes[0].tname.clone()
+		for x in as_cast_type_indexes {
+			if x.tindex == obj_type {
+				obj_name = x.tname.clone()
+			}
+			if x.tindex == expected_type {
+				expected_name = x.tname.clone()
+			}
+		}
+		panic('as cast: cannot cast `' + obj_name + '` to `' + expected_name + '`')
+	}
+	return obj
+}
+
+@[inline]
+fn __v2_flag_has_int(receiver int, flag int) bool {
+	return (receiver & flag) != 0
+}
+
+@[inline]
+fn __v2_flag_all_int(receiver int, flags int) bool {
+	return (receiver & flags) == flags
+}