Primitive Type Cheat Sheet

The following table summarizes RPython’s primitive types and corresponding low-level types, FFI types, and C types.

RPython Type (Primitive)	LL Type	FFI Type	C Type (64-bit Linux)
int	Signed	SIGNED	long
long	Signed	LONG	long
r_uint	Unsigned	UINT	unsigned long
r_ulonglong	UnsignedLongLong	ULONGLONG	unsigned long
r_longlong	SignedLongLong	LONGLONG	long long
r_longlonglong	SignedLongLongLong	__INT128_T	__int128_t
r_singlefloat	SingleFloat	FLOAT	float
float	Float	DOUBLE	double
r_longfloat	LongFloat	LONGDOUBLE	long double
char	Char	CHAR	char
bool	Bool	N/A	boot_t
NoneType	Void	VOID	void
unicode	UniChar	WCHAR_T	wchar_t

• RPython types start with r_ can be imported from the rpython.rlib.rarithmetic module.

• Low-level types can be imported from the rpython.rtyper.lltypesystem.lltype module.

• FFI types can be imported from the rpython.rtyper.lltypesystem.rffi module.

The definitions of these types can be found in the following source code.

• Arithmetic type (r_*): rpython/rlib/rarithmetic.py

• LL type: rpython/rtyper/lltypesystem/lltype.py

• FFI type: rpython/rtyper/lltypesystem/rffi.py

• C type: rpython/translator/c/primitive.py

In addition to these primitive types, there are other types like pointer types for FFI.