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
|
href='#n306'>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
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
|
# Comparing arrays of numbers.
== code
array-equal?: # a: (addr array int), b: (addr array int) -> result/eax: boolean
# pseudocode:
# asize = a->size
# if (asize != b->size) return false
# i = 0
# curra = a->data
# currb = b->data
# while i < asize
# i1 = *curra
# i2 = *currb
# if (c1 != c2) return false
# i+=4, curra+=4, currb+=4
# return true
#
# registers:
# i: ecx
# asize: edx
# curra: esi
# currb: edi
# i1: eax
# i2: ebx
#
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
51/push-ecx
52/push-edx
53/push-ebx
56/push-esi
57/push-edi
# esi = a
8b/-> *(ebp+8) 6/r32/esi
# edi = b
8b/-> *(ebp+0xc) 7/r32/edi
# var asize/edx: int = a->size
8b/-> *esi 2/r32/edx
$array-equal?:sizes:
# if (asize != b->size) return false
39/compare *edi 2/r32/edx
75/jump-if-!= $array-equal?:false/disp8
# var curra/esi: (addr byte) = a->data
81 0/subop/add %esi 4/imm32
# var currb/edi: (addr byte) = b->data
81 0/subop/add %edi 4/imm32
# var i/ecx: int = 0
31/xor-with %ecx 1/r32/ecx
# var vala/eax: int
# var valb/ebx: int
$array-equal?:loop:
# if (i >= asize) return true
39/compare %ecx 2/r32/edx
7d/jump-if->= $array-equal?:true/disp8
# var vala/eax: int = *curra
8b/-> *esi 0/r32/eax
# var valb/ebx: int = *currb
8b/-> *edi 3/r32/ebx
# if (vala != valb) return false
39/compare %eax 3/r32/ebx
75/jump-if-!= $array-equal?:false/disp8
# i += 4
81 0/subop/add %ecx 4/imm32
# currs += 4
81 0/subop/add %esi 4/imm32
# currb += 4
81 0/subop/add %edi 4/imm32
eb/jump $array-equal?:loop/disp8
$array-equal?:true:
b8/copy-to-eax 1/imm32
eb/jump $array-equal?:end/disp8
$array-equal?:false:
b8/copy-to-eax 0/imm32
$array-equal?:end:
# . restore registers
5f/pop-to-edi
5e/pop-to-esi
5b/pop-to-ebx
5a/pop-to-edx
59/pop-to-ecx
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-compare-empty-with-empty-array:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# var ecx: (array _) = []
68/push 0/imm32/size
89/<- %ecx 4/r32/esp
# var edx: (array _) = []
68/push 0/imm32/size
89/<- %edx 4/r32/esp
#
(array-equal? %ecx %edx) # => eax
(check-ints-equal %eax 1 "F - test-compare-empty-with-empty-array")
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-compare-empty-with-non-empty-array: # also checks size-mismatch code path
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# var ecx: (array int) = [1]
68/push 1/imm32
68/push 4/imm32/size
89/<- %ecx 4/r32/esp
# var edx: (array int) = []
68/push 0/imm32/size
89/<- %edx 4/r32/esp
#
(array-equal? %ecx %edx) # => eax
(check-ints-equal %eax 0 "F - test-compare-empty-with-non-empty-array")
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-compare-equal-arrays:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# var ecx: (array int) = [1, 2, 3]
68/push 3/imm32
68/push 2/imm32
68/push 1/imm32
68/push 0xc/imm32/size
89/<- %ecx 4/r32/esp
# var edx: (array int) = [1, 2, 3]
68/push 3/imm32
68/push 2/imm32
68/push 1/imm32
68/push 0xc/imm32/size
89/<- %edx 4/r32/esp
#
(array-equal? %ecx %edx) # => eax
(check-ints-equal %eax 1 "F - test-compare-equal-arrays")
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-compare-inequal-arrays-equal-sizes:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# var ecx: (array int) = [1, 4, 3]
68/push 3/imm32
68/push 4/imm32
68/push 1/imm32
68/push 0xc/imm32/size
89/<- %ecx 4/r32/esp
# var edx: (array int) = [1, 2, 3]
68/push 3/imm32
68/push 2/imm32
68/push 1/imm32
68/push 0xc/imm32/size
89/<- %edx 4/r32/esp
#
(array-equal? %ecx %edx) # => eax
(check-ints-equal %eax 0 "F - test-compare-inequal-arrays-equal-sizes")
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
parse-array-of-ints: # ad: (addr allocation-descriptor), s: (addr string), out: (addr handle array int)
# pseudocode
# end = &s->data[s->size]
# curr = s->data
# size = 0
# while true
# if (curr >= end) break
# curr = skip-chars-matching-in-slice(curr, end, ' ')
# if (curr >= end) break
# curr = skip-chars-not-matching-in-slice(curr, end, ' ')
# ++size
# allocate-array(ad, size*4, out)
# var slice: slice = {s->data, 0}
# curr = lookup(out)->data
# while true
# if (slice->start >= end) break
# slice->start = skip-chars-matching-in-slice(slice->start, end, ' ')
# if (slice->start >= end) break
# slice->end = skip-chars-not-matching-in-slice(slice->start, end, ' ')
# *curr = parse-hex-int-from-slice(slice)
# curr += 4
# slice->start = slice->end
# return result
#
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
50/push-eax
51/push-ecx
52/push-edx
53/push-ebx
56/push-esi
57/push-edi
# esi = s
8b/-> *(ebp+0xc) 6/r32/esi
# var curr/ecx: (addr byte) = s->data
8d/copy-address *(esi+4) 1/r32/ecx
# var end/edx: (addr byte) = &s->data[s->size]
# . edx = s->size
8b/-> *esi 2/r32/edx
# . edx += curr
01/add-to %edx 1/r32/ecx
# var size/ebx: int = 0
31/xor-with %ebx 3/r32/ebx
$parse-array-of-ints:loop1:
# if (curr >= end) break
39/compare %ecx 2/r32/edx
73/jump-if-addr>= $parse-array-of-ints:break1/disp8
# curr = skip-chars-matching-in-slice(curr, end, ' ')
(skip-chars-matching-in-slice %ecx %edx 0x20) # => eax
89/<- %ecx 0/r32/eax
# if (curr >= end) break
39/compare %ecx 2/r32/edx
73/jump-if-addr>= $parse-array-of-ints:break1/disp8
# curr = skip-chars-not-matching-in-slice(curr, end, ' ')
(skip-chars-not-matching-in-slice %ecx %edx 0x20) # => eax
89/<- %ecx 0/r32/eax
# size += 4
81 0/subop/add %ebx 4/imm32
eb/jump $parse-array-of-ints:loop1/disp8
$parse-array-of-ints:break1:
(allocate-array *(ebp+8) %ebx *(ebp+0x10))
$parse-array-of-ints:pass2:
# var slice/edi: slice = {s->data, 0}
68/push 0/imm32/end
8d/copy-address *(esi+4) 7/r32/edi
57/push-edi
89/<- %edi 4/r32/esp
# curr = lookup(out)->data
8b/-> *(ebp+0x10) 0/r32/eax
(lookup *eax *(eax+4)) # => eax
8d/copy-address *(eax+4) 1/r32/ecx
$parse-array-of-ints:loop2:
# if (slice->start >= end) break
39/compare *edi 2/r32/edx
73/jump-if-addr>= $parse-array-of-ints:end/disp8
# slice->start = skip-chars-matching-in-slice(slice->start, end, ' ')
(skip-chars-matching-in-slice *edi %edx 0x20) # => eax
89/<- *edi 0/r32/eax
# if (slice->start >= end) break
39/compare *edi 2/r32/edx
73/jump-if-addr>= $parse-array-of-ints:end/disp8
# slice->end = skip-chars-not-matching-in-slice(slice->start, end, ' ')
(skip-chars-not-matching-in-slice *edi %edx 0x20) # => eax
89/<- *(edi+4) 0/r32/eax
# *curr = parse-hex-int-from-slice(slice)
(parse-hex-int-from-slice %edi)
89/<- *ecx 0/r32/eax
# curr += 4
81 0/subop/add %ecx 4/imm32
# slice->start = slice->end
8b/-> *(edi+4) 0/r32/eax
89/<- *edi 0/r32/eax
eb/jump $parse-array-of-ints:loop2/disp8
$parse-array-of-ints:end:
# . reclaim locals
81 0/subop/add %esp 8/imm32
# . restore registers
5f/pop-to-edi
5e/pop-to-esi
5b/pop-to-ebx
5a/pop-to-edx
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-parse-array-of-ints:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# var h/esi: (handle array int)
68/push 0/imm32
68/push 0/imm32
89/<- %esi 4/r32/esp
# var ecx: (array int) = [1, 2, 3]
68/push 3/imm32
68/push 2/imm32
68/push 1/imm32
68/push 0xc/imm32/size
89/<- %ecx 4/r32/esp
#
(parse-array-of-ints Heap "1 2 3" %esi)
(lookup *esi *(esi+4)) # => eax
(array-equal? %ecx %eax) # => eax
(check-ints-equal %eax 1 "F - test-parse-array-of-ints")
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-parse-array-of-ints-empty:
# - empty string = empty array
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# var h/esi: handle
68/push 0/imm32
68/push 0/imm32
89/<- %esi 4/r32/esp
#
(parse-array-of-ints Heap "" %esi)
(lookup *esi *(esi+4)) # => eax
(check-ints-equal *eax 0 "F - test-parse-array-of-ints-empty")
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-parse-array-of-ints-just-whitespace:
# - just whitespace = empty array
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# var h/esi: handle
68/push 0/imm32
68/push 0/imm32
89/<- %esi 4/r32/esp
#
(parse-array-of-ints Heap Space %esi)
(lookup *esi *(esi+4)) # => eax
(check-ints-equal *eax 0 "F - test-parse-array-of-ints-just-whitespace")
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-parse-array-of-ints-extra-whitespace:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# var h/esi: handle
68/push 0/imm32
68/push 0/imm32
89/<- %esi 4/r32/esp
# var ecx: (array int) = [1, 2, 3]
68/push 3/imm32
68/push 2/imm32
68/push 1/imm32
68/push 0xc/imm32/size
89/<- %ecx 4/r32/esp
#
(parse-array-of-ints Heap " 1 2 3 " %esi)
(lookup *esi *(esi+4)) # => eax
(array-equal? %ecx %eax) # => eax
(check-ints-equal %eax 1 "F - test-parse-array-of-ints-extra-whitespace")
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
# helper for later tests
# compare an array with a string representation of an array literal
check-array-equal: # a: (addr array int), expected: (addr string), msg: (addr string)
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
50/push-eax
56/push-esi
# var h/esi: handle
68/push 0/imm32
68/push 0/imm32
89/<- %esi 4/r32/esp
# var b/eax: (addr array int) = parse-array-of-ints(Heap, expected)
(parse-array-of-ints Heap *(ebp+0xc) %esi)
(lookup *esi *(esi+4)) # => eax
#
(array-equal? *(ebp+8) %eax)
(check-ints-equal %eax 1 *(ebp+0x10))
$check-array-equal:end:
# . restore registers
5e/pop-to-esi
58/pop-to-eax
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-check-array-equal:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# var ecx: (array int) = [1, 2, 3]
68/push 3/imm32
68/push 2/imm32
68/push 1/imm32
68/push 0xc/imm32/size
89/<- %ecx 4/r32/esp
#
(check-array-equal %ecx "1 2 3" "F - test-check-array-equal")
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
# . . vim:nowrap:textwidth=0
|