PlanckForth: Bootstrapping Forth from Handwritten Executable

$ git clone https://github.com/nineties/planckforth.git
$ cd planckforth
$ make
$ cat helloworld.fs | ./planck

Builtin Words

code	name	stack effect	semantics
Q	quit	( -- )	Exit the process
C	cell	( -- n )	The size of Cells
h	here	( -- addr )	The address of 'here' cell
l	latest	( -- addr )	The address of 'latest' cell
k	key	( -- c )	Read character
t	type	( c -- )	Print character
j	jump	( -- )	Unconditional branch
J	0jump	( a -- )	Jump if a == 0
f	find	( c -- xt )	Get execution token of c
x	execute	( xt -- ... )	Run the execution token
@	fetch	( addr -- a )	Load value from addr
!	store	( a addr -- )	Store value to addr
?	cfetch	( addr -- c )	Load byte from addr
$	cstore	( c addr -- )	Store byte to addr
d	dfetch	( -- addr )	Get data stack pointer
D	dstore	( addr -- )	Set data stack pointer
r	rfetch	( -- addr )	Get return stack pointer
R	rstore	( addr -- )	Set return stack pointer
i	docol	( -- addr )	Get the interpreter function
e	exit	( -- )	Exit current function
L	lit	( -- a )	Load immediate
S	string	( -- addr len)	Load string literal
+	add	( a b -- c )	c = (a + b)
-	sub	( a b -- c )	c = (a - b)
*	mul	( a b -- c )	c = (a * b)
/	div	( a b -- c )	c = (a / b)
%	mod	( a b -- c )	c = (a % b)
&	and	( a b -- c )	c = (a & b)
\|	or	( a b -- c )	c = (a \| b)
^	xor	( a b -- c )	c = (a ^ b)
<	less	( a b -- c )	c = (a < b)
=	equal	( a b -- c )	c = (a == b)