+#include <stdbool.h>
+#include "ast.h"
+#include "symbol.h"
+
+/* note that the constant values represent the rank of the types as defined
+ * in ยง 6.3.1 */
+typedef enum {
+ ATOMIC_TYPE_INVALID = 0,
+ ATOMIC_TYPE_VOID,
+ ATOMIC_TYPE_CHAR,
+ ATOMIC_TYPE_SCHAR,
+ ATOMIC_TYPE_UCHAR,
+ ATOMIC_TYPE_SHORT,
+ ATOMIC_TYPE_USHORT,
+ ATOMIC_TYPE_INT,
+ ATOMIC_TYPE_UINT,
+ ATOMIC_TYPE_LONG,
+ ATOMIC_TYPE_ULONG,
+ ATOMIC_TYPE_LONGLONG,
+ ATOMIC_TYPE_ULONGLONG,
+ ATOMIC_TYPE_FLOAT,
+ ATOMIC_TYPE_DOUBLE,
+ ATOMIC_TYPE_LONG_DOUBLE,
+ ATOMIC_TYPE_BOOL,
+
+ ATOMIC_TYPE_LAST = ATOMIC_TYPE_BOOL
+} atomic_type_kind_t;
+
+typedef enum {
+ ATOMIC_TYPE_FLAG_NONE = 0,
+ ATOMIC_TYPE_FLAG_SIGNED = 1 << 0,
+ ATOMIC_TYPE_FLAG_INTEGER = 1 << 1,
+ ATOMIC_TYPE_FLAG_FLOAT = 1 << 2,
+ ATOMIC_TYPE_FLAG_ARITHMETIC = 1 << 3,
+ ATOMIC_TYPE_FLAG_COMPLEX = 1 << 4,
+} atomic_type_flag_t;
+
+typedef struct type_base_t type_base_t;
+typedef struct atomic_type_t atomic_type_t;
+typedef struct complex_type_t complex_type_t;
+typedef struct imaginary_type_t imaginary_type_t;
+typedef struct pointer_type_t pointer_type_t;
+typedef struct function_parameter_t function_parameter_t;
+typedef struct function_type_t function_type_t;
+typedef struct compound_type_t compound_type_t;
+typedef struct enum_type_t enum_type_t;
+typedef struct builtin_type_t builtin_type_t;
+typedef struct array_type_t array_type_t;
+typedef struct typedef_type_t typedef_type_t;
+typedef struct bitfield_type_t bitfield_type_t;
+typedef struct typeof_type_t typeof_type_t;
+typedef union type_t type_t;
+
+void init_types(void);
+void exit_types(void);
+
+void print_type(const type_t *type);
+
+/**
+ * prints a human readable form of @p type. prints an abstract typename
+ * if symbol is NULL
+ */
+void print_type_ext(const type_t *type, const symbol_t *symbol,
+ const scope_t *scope);
+
+void print_type_qualifiers(unsigned qualifiers);