1 ;;; Words for adding words
3 WORD p_here,'HERE',dovariable
7 WORD p_create,'CREATE',fasm
8 ;; CREATE ( chars* n -- tfa )
9 ;; Add the pstring as a new word in the current wordlist.
11 mov rax,qword [p_wordlist_DFA] ; Current word list
12 mov rax,[rax] ; last word of current wordlist
13 mov rbx,qword [p_here_DFA]
14 mov [rbx],rax ; TFA of new word
15 mov qword [rbx+16],0 ; flags field
18 mov qword [rbx+24],rcx ; PFA (length)
19 pop rsi ; chars* (source)
20 lea rdi,[rbx+32] ; (dest)
26 mov byte [rdi],0 ; extra NUL
28 mov qword [rdi],rbx ; pTFA
30 mov qword [rdi],rbx ; OFF
32 mov qword [rbx+8],rdi ; pCFA
34 mov qword [rdi],dovalue ;CFA
36 mov qword [rax],rbx ; Install new word
37 mov qword [p_here_DFA],rdi ; allocate the space
42 WORD p_allot,'ALLOT',fasm
44 ;; Allocate n bytes on the heap
46 add rax,qword [p_here_DFA]
47 mov qword [p_here_DFA],rax
52 ;; Put cell value onto the heap and advance "HERE"
53 mov rax,qword [p_here_DFA]
57 mov qword [p_here_DFA],rax
60 WORD p_Ccomma,'C,',fasm
62 ;; Put byte value onto the heap and advance "HERE"
63 mov rax,qword [p_here_DFA]
67 mov qword [p_here_DFA],rax
70 WORD p_does,'DOES>',fasm,IMMEDIATE
72 ;; Change the "DOES offset" of latest compilation and assign
73 ;; it the "dodoes" execution semantics,
74 mov rax,qword [p_wordlist_DFA]
75 mov rax,[rax] ; last word of current wordlist
76 tfa2does rax ; *rax is the DOES offset field
77 ;; offset = qword [p_here_DFA]) - (rax+2*8)
78 mov rbx,qword [p_here_DFA]
82 mov qword [rax+8],dodoes
85 WORD p_literal,'LIT',fasm
87 ;; Push the value of successor cell onto stack, and skip it
92 WORD p_literal_string,'S"',fasm
95 ;; Push the value of successor cell onto stack, and skip it
103 ;;; ========================================
104 ;;; The text interpreter
106 WORD p_state,'STATE',dovariable
107 ;; Interpretation state (0=interpreting, 1=compiling)
110 WORD p_left_bracket,'[',fasm,IMMEDIATE
112 ;; Change state to interpretation state.
113 mov qword[p_state_DFA],0
116 WORD p_right_bracket,']',fasm
118 ;; Change state to compilation state.
119 mov qword[p_state_DFA],1
122 WORD p_base,'BASE',dovariable
125 WORD p_decimal,'DECIMAL',fasm
128 mov qword [p_base_DFA],10
131 WORD p_hex,'HEX',fasm
134 mov qword [p_base_DFA],16
137 WORD p_number,'NUMBER',fasm
138 ;; ( chars* n -- [ 0 ]/[ v 1 ] )
140 pop rcx ; ( -- chars* )
143 mov rbx,1 ; sign (byte 0=0 means negative)
144 cmp qword [p_base_DFA],10
155 xor rax,rax ; clearing
165 mul qword [p_base_DFA] ; uses rdx:rax
189 jne p_numper_POSITIVE
197 WORD p_this_word,'THIS-WORD',dovariable
198 dq 0,0 ; ( n chars* )
200 WORD p_evaluate_stream,'EVALUATE-STREAM'
201 ;; ( stream* -- *?* flag )
202 ;; Execute the words from the given stream
203 ;; returns 1 if stream ends and 0 if an unknown word is found
204 dq p_ltR ; Keep the stream on the return stack.
205 p_evaluate_stream_LOOP:
206 dq p_Rget ; ( -- stream*
207 dq p_read_word ; ( -- chars* n )
209 BRANCH 0,p_evaluate_stream_END ; branch if 0 on TOP
210 dq p_2dup ; ( -- chars* n chars* n )
211 dq p_this_word ; ( -- chars* n chars* n p )
212 dq p_2put ; ( -- chars* n )
213 dq p_find ; ( -- [ chars* n 0 ]/[ tfa ] )
214 dq p_dup ; ( -- [ chars* n 0 0 ]/[ tfa tfa ] )
215 BRANCH 0,p_evaluate_stream_NOTWORD ; branch if 0 on TOP
216 dq p_execute ; consumes tfa
217 BRANCH ,p_evaluate_stream_LOOP
218 p_evaluate_stream_NOTWORD:
219 dq p_drop ; ( -- chars* n )
220 dq p_number ; ( -- [ 0 ]/[ v 1 ] )
222 BRANCH 0,p_evaluate_stream_BAD ; branch if 0
224 BRANCH ,p_evaluate_stream_LOOP
225 p_evaluate_stream_END:
229 p_evaluate_stream_BAD:
230 dq p_Rgt ; Discard the stream from the return stack