about summary refs log tree commit diff stats
path: root/linux/301array-equal.subx
blob: 7c6281e9c3bd2c5f29fbc7559945ddbe7f5aa759 (plain) (blame)
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
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
414
415
416
417
418
419
420
421
422
423
# 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 array byte), 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

parse-array-of-ints:  # s: (addr array byte), out: (addr handle array int)
    # . prologue
    55/push-ebp
    89/<- %ebp 4/r32/esp
    #
    (_parse-array-of-ints Heap *(ebp+8) *(ebp+0xc))
$parse-array-of-ints:end:
    # . 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 *(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