/
main.fs
340 lines (311 loc) · 8.7 KB
/
main.fs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
require leb128.fs
require parser.fs
require cs-stack.fs
\ ------------------ Compiler
CREATE FUNCTIONS 32 ALLOT
: compile-load-local ( n -- )
POSTPONE [ POSTPONE @local# CELLS , \ not sure why ] causes an error here, works anyway
;
: compile-store-local ( n -- )
POSTPONE [ POSTPONE laddr# CELLS , \ not sure why ] causes an error here, works anyway
;
: compile-apply-memarg ( c-addr -- ptr )
char+ \ ignore alignment
consume-uleb128 \ offset
POSTPONE LITERAL POSTPONE +
POSTPONE MEMORY-PTR POSTPONE + \ don't compile the value of MEMORY_PTR because it can change
;
: truncate-i32 ( n -- n )
$ffffffff AND
;
: consume-byte ( c-addr -- c-addr n )
dup char+ swap c@
;
: compile-instruction ( ..cs-items.. c-addr1 type-stack cs-stack -- ..cs-items.. c-addr2 )
{ c-addr type-stack cs-stack }
c-addr consume-byte
CASE
$01 OF \ nop
ENDOF
$02 OF \ block
consume-leb128 drop \ ignore blocktype
TYPE-BLOCK type-stack stack.push
ENDOF
$03 OF \ loop
consume-leb128 drop \ ignore blocktype
TO c-addr
postpone begin
c-addr
TYPE-LOOP type-stack stack.push
type-stack stack.size 1- cs-stack cs-stack.push-loop-begin
ENDOF
$04 OF \ if
consume-leb128 drop \ ignore blocktype
TO c-addr
postpone 0<>
postpone if
c-addr
cs-stack cs-stack.push-ignore
TYPE-IFELSE type-stack stack.push
ENDOF
$05 OF \ else
TO c-addr
type-stack cs-stack gen-end
cs-stack cs-stack.pop-index-ignore cs-roll
postpone ahead
1 cs-roll
postpone endif
cs-stack cs-stack.push-ignore
TYPE-IFELSE type-stack stack.push
c-addr
ENDOF
$0b OF \ end : --
TO c-addr
type-stack stack.head TYPE-IFELSE = IF
cs-stack cs-stack.pop-index-ignore cs-roll postpone endif
ENDIF
type-stack cs-stack gen-end
c-addr
ENDOF
$0c OF \ br [lit] : --
consume-leb128 swap
TO c-addr
type-stack cs-stack gen-br
c-addr
ENDOF
$0D OF \ br_if [lit] : v --
consume-leb128 swap
TO c-addr
type-stack cs-stack gen-br_if
c-addr
ENDOF
\ $0D OF \ br_table
\ ENDOF
$0F OF \ return
TO c-addr
type-stack stack.size 1-
type-stack cs-stack gen-br
c-addr
ENDOF
$10 OF \ call [idx] : --
consume-uleb128 cells FUNCTIONS +
POSTPONE LITERAL POSTPONE @ POSTPONE EXECUTE
ENDOF
\ $11 OF \ call_indirect
\ ENDOF
$1A OF \ drop : v --
POSTPONE drop
ENDOF
$41 OF \ i32.const [lit] : -- lit
consume-leb128
POSTPONE LITERAL
ENDOF
$42 OF \ i64.const [lit] : -- lit
consume-leb128
POSTPONE LITERAL
ENDOF
$46 OF \ i32.eq : a b -- c
POSTPONE = POSTPONE 1 POSTPONE AND
ENDOF
$47 OF \ i32.ne : a b -- c
POSTPONE <> POSTPONE 1 POSTPONE AND
ENDOF
$51 OF \ i64.eq : a b -- c
POSTPONE = POSTPONE 1 POSTPONE AND
ENDOF
$52 OF \ i64.ne : a b -- c
POSTPONE <> POSTPONE 1 POSTPONE AND
ENDOF
$6a OF \ i32.add : a b -- c
POSTPONE + POSTPONE truncate-i32
ENDOF
$6b OF \ i32.sub : a b -- c
POSTPONE - POSTPONE truncate-i32
ENDOF
$6c OF \ i32.mul : a b -- c
POSTPONE * POSTPONE truncate-i32
ENDOF
$74 OF \ i32.shl : a n -- b
POSTPONE lshift POSTPONE truncate-i32
ENDOF
$76 OF \ i32.shr_u : a n -- b
POSTPONE rshift POSTPONE truncate-i32
ENDOF
$7C OF \ i64.add : a b -- c
POSTPONE +
ENDOF
$7D OF \ i64.sub : a b -- c
POSTPONE -
ENDOF
$7E OF \ i64.mul : a b -- c
POSTPONE *
ENDOF
$20 OF \ local.get [lit] : -- v
consume-uleb128
compile-load-local
ENDOF
$21 OF \ local.set [lit] : v --
consume-uleb128
compile-store-local POSTPONE !
ENDOF
$22 OF \ local.tee [lit] : v --
POSTPONE dup
consume-uleb128
compile-store-local POSTPONE !
ENDOF
$23 OF \ global.get : [lit] -- v
consume-uleb128 cells GLOBALS-PTR + POSTPONE LITERAL \ GLOBALS-PTR is constant
POSTPONE @
ENDOF
$24 OF \ global.set : [lit] v --
consume-uleb128 cells GLOBALS-PTR + POSTPONE LITERAL \ GLOBALS-PTR is constant
POSTPONE !
ENDOF
$36 OF \ i32.store : addr v --
POSTPONE swap
compile-apply-memarg
POSTPONE l!
ENDOF
$28 OF \ i32.load : addr -- v
compile-apply-memarg
POSTPONE ul@
ENDOF
$2D OF \ i32.load8_u : addr -- v
compile-apply-memarg
POSTPONE c@
ENDOF
( n ) ." unhandled instruction " hex. bye
ENDCASE
;
: compile-instructions ( a-addr -- )
dup dup @ chars + cell+ swap
cell+
stack.new
stack.new
{ end pos type-stack cs-stack }
TYPE-BLOCK type-stack stack.push \ function is a block
BEGIN
pos type-stack cs-stack
compile-instruction
TO pos
end pos <=
UNTIL
\ TODO function "end" is optional?
;
: compile-function-prelude ( nparams nlocals -- )
0 ?DO
POSTPONE lp-
LOOP
0 ?DO
POSTPONE >l
LOOP
;
: compile-function-postlude ( nparams nlocals -- )
+
0 ?DO
POSTPONE lp+
LOOP
;
: compile-function ( nparams a-addr -- )
dup @
rot swap
( a-addr nparams nlocals )
2dup compile-function-prelude
rot cell+
compile-instructions
compile-function-postlude
; IMMEDIATE
: create-function ( nparams a-addr -- xt )
\ use return stack to smuggle the params around the stack elements pushed by :noname
>r >r
:noname r> r> POSTPONE compile-function POSTPONE ;
\ "quotations" appear to be the indetended mechanism for this, but dynamically generating code doesn't work
\ [: [ POSTPONE . ] ;]
;
\ ------------------ Initialization
\ CREATE CODE-temporary
\ 0 , \ 0 local
\ 21 , \ 6 bytes code
\ \ $02 c, $40 c, \ block
\ $02 c, $40 c, \ block
\ $41 c, $00 c, \ i32.const
\ $0d c, $01 c, \ br_if 0
\ $41 c, $05 c, \ i32.const 5
\ $0c c, $01 c, \ br 1
\ $0b c, \ end
\ $41 c, $04 c, \ i32.const 4
\ $41 c, $01 c, \ i32.const
\ $0d c, $00 c, \ br_if 0
\ $41 c, $01 c, \ i32.const 1
\ $6a c, \ i32.add
\ \ $0b c, \ end
\ $0b c, \ end
\ CREATE CODE-temporary
\ 0 , \ 0 locals
\ 8 , \ 8 bytes code
\ $20 c, $01 c, \ local.get 1
\ $41 c, $00 c, \ i32.const 0
\ $36 c, $02 c, $00 c, \ i32.store align=2 offset=0
\ $0b c, \ return
\ : temporary [
\ 0 CODE-temporary compile-function
\ ] ;
\ see temporary cr
\ temporary . cr
\ bye
\ CREATE CODE-temporary
\ 1 , \ 1 local
\ 11 , \ 11 bytes code
\ $20 c, $01 c, \ local.get 1
\ $20 c, $00 c, \ local.get 0
\ $6a c, \ i32.add
\ $22 c, $02 c, \ local.tee 2
\ $20 c, $02 c, \ local.get 2
\ $6a c, \ i32.add
\ $0b c, \ return
\ : temporary [
\ 2 CODE-temporary compile-function
\ ] ;
\ see temporary cr
\ cr
\ 3 11 temporary .s \ 11 3 + dup + = 28
\ bye
: get-arg ( -- a-addr u )
next-arg
dup 0 = IF
." No wasm file specified"
1 (bye)
ENDIF
;
get-arg open-input
parse-wasm
close-input
:noname
START-FN -1 = IF
." No start function found"
1 (bye)
ENDIF
; EXECUTE
: compile-functions
COUNT-FN 0 ?DO
FN-INFOS i CELLS + @ \ pointer to [nlocals nbytes ...code] OR [0 0 (ptr to host function)]
dup @ \ nlocals
over cell+ @ \ nbytes
+ 0 = IF \ host function
2 cells + @
\ i . dup xt-see cr
FUNCTIONS i CELLS + !
ELSE \ compile
FN-TYPES i CELLS + @ ( a-addr tid )
2 * CELLS cell+ TYPES + @ ( a-addr nparams )
swap
create-function
\ i . dup xt-see cr
FUNCTIONS i CELLS + !
ENDIF
LOOP
;
compile-functions
FUNCTIONS START-FN CELLS + @ EXECUTE
\ FUNCTIONS 0 CELLS + @ xt-see
bye