#ifndef _datatype_h_
#define _datatype_h_
#include "pre.h"

enum DataTypeKind
{
	DtkInvalid = 0,
	DtkVoid,
	DtkBasic,
	DtkStruct,
	DtkUnion,
	DtkProc,
	DtkArray,
	DtkBool,
};

typedef struct DataType DataType;

typedef struct {
	bool packed;
	Vec(DataType *) fields;
} DataTypeCompound;

struct DataType
{
	enum DataTypeKind kind;
	u16 size; /* size in bytes of the data type */
	bool builtin; /* if this type is defined in compilerland */
	bool sign; /* if the type is numerical and has a sign or not */
	Str name;

	union {
		DataTypeCompound compound; /* Represents either a struct or union type */
		struct {
			DataType *rettype;
			Vec(DataType *) argtypes;
			bool public;
			bool extern_lnk; /* external linkage */
			bool c_varargs; /* C-style varargs (for FFI) */
		} proc;
		struct {
			DataType *base;
			isize len;
		} array;
	};
};

typedef struct {
	bool ok; /* whether the type checking succeeded */
	Str msg; /* message describing the type error */
} DataTypeCheck;

#endif