implemented basic parsing

sema.h

@@ -0,0 +1,54 @@
+#ifndef SEMA_H
+#define SEMA_H
+
+typedef enum {
+	TYPE_VOID,
+	TYPE_PTR,
+	TYPE_I8,
+	TYPE_I16,
+	TYPE_I32,
+	TYPE_I64,
+	TYPE_U8,
+	TYPE_U16,
+	TYPE_U32,
+	TYPE_U64,
+	TYPE_STRUCT,
+	TYPE_UNION,
+	TYPE_ENUM,
+} type_tag;
+
+typedef struct _type {
+	type_tag tag;
+	union {
+		u8 integer;
+		u8 flt; // float
+		struct {
+			bool is_const;
+			bool is_volatile;
+			u16 alignment;
+			struct _type child;
+		} ptr;
+		struct {
+			usize len;
+			struct _type child;
+		} array;
+		struct {
+			struct_layout layout;
+			char *name;
+			usize name_len;
+			usize alignment;
+			member *members;
+			function_decl *decls;
+		} structure;
+		struct {
+			struct_layout layout;
+			char *name;
+			usize name_len;
+			usize alignment;
+			member *members;
+			function_decl *decls;
+		} enum;
+	} data;
+} type;
+
+#endif