107trace.subx


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
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-10-23 01:04:16 +0000
 

.               4/imm32           # add to esp
    # eax = trace-scan("cd")
    # . . push args
    68/push  "cd"/imm32
    # . . call
    e8/call  trace-scan/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # check-ints-equal(eax, 1, msg)
    # . . push args
    68/push  "F - test-trace-scan-skips-lines-until-found"/imm32
    68/push  1/imm32
    50/push-eax
    # . . call
    e8/call check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # pop into *Trace-stream
    8f          0/subop/pop         0/mod/indirect  5/rm32/.disp32            .             .           .           Trace-stream/disp32               # pop into *Trace-stream
    # . end
    c3/return

test-trace-second-scan-starts-where-first-left-off:
    # push *Trace-stream
    ff          6/subop/push        0/mod/indirect  5/rm32/.disp32            .             .           .           Trace-stream/disp32               # push *Trace-stream
    # setup
    # . *Trace-stream = _test-trace-stream
    b8/copy-to-eax  _test-trace-stream/imm32
    89/copy                         0/mod/indirect  5/rm32/.disp32            .             .           0/r32/eax   Trace-stream/disp32               # copy eax to *Trace-stream
    # . clear-trace-stream()
    e8/call  clear-trace-stream/disp32
    # . trace("Ab")
    # . . push args
    68/push  "Ab"/imm32
    # . . call
    e8/call  trace/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . eax = trace-scan("Ab")
    # . . push args
    68/push  "Ab"/imm32
    # . . call
    e8/call  trace-scan/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # second scan fails
    # . eax = trace-scan("Ab")
    # . . push args
    68/push  "Ab"/imm32
    # . . call
    e8/call  trace-scan/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-trace-second-scan-starts-where-first-left-off"/imm32
    68/push  0/imm32
    50/push-eax
    # . . call
    e8/call check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # pop into *Trace-stream
    8f          0/subop/pop         0/mod/indirect  5/rm32/.disp32            .             .           .           Trace-stream/disp32               # pop into *Trace-stream
    # . end
    c3/return

test-trace-scan-failure-leaves-read-index-untouched:
    # push *Trace-stream
    ff          6/subop/push        0/mod/indirect  5/rm32/.disp32            .             .           .           Trace-stream/disp32               # push *Trace-stream
    # setup
    # . *Trace-stream = _test-trace-stream
    b8/copy-to-eax  _test-trace-stream/imm32
    89/copy                         0/mod/indirect  5/rm32/.disp32            .             .           0/r32/eax   Trace-stream/disp32               # copy eax to *Trace-stream
    # . clear-trace-stream()
    e8/call  clear-trace-stream/disp32
    # . trace("Ab")
    # . . push args
    68/push  "Ab"/imm32
    # . . call
    e8/call  trace/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . check-ints-equal(_test-trace-stream->read, 0, msg)
    # . . push args
    68/push  "F - test-trace-second-scan-starts-where-first-left-off/precondition-failure"/imm32
    68/push  0/imm32
    b8/copy-to-eax  _test-trace-stream/imm32
    ff          6/subop/push        1/mod/*+disp8   0/rm32/eax    .           .             .           .           4/disp8         .                 # push *(eax+4)
    # . . call
    e8/call check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # perform a failing scan
    # . eax = trace-scan("Ax")
    # . . push args
    68/push  "Ax"/imm32
    # . . call
    e8/call  trace-scan/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # no change in read index
    # . check-ints-equal(_test-trace-stream->read, 0, msg)
    # . . push args
    68/push  "F - test-trace-second-scan-starts-where-first-left-off"/imm32
    68/push  0/imm32
    b8/copy-to-eax  _test-trace-stream/imm32
    ff          6/subop/push        1/mod/*+disp8   0/rm32/eax    .           .             .           .           4/disp8         .                 # push *(eax+4)
    # . . call
    e8/call check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # pop into *Trace-stream
    8f          0/subop/pop         0/mod/indirect  5/rm32/.disp32            .             .           .           Trace-stream/disp32               # pop into *Trace-stream
    # . end
    c3/return

next-line-matches?:  # t: (addr stream byte), line: (addr array byte) -> result/eax: boolean
    # pseudocode:
    #   while true:
    #     if (currl >= maxl) break
    #     if (currt >= maxt) return false
    #     if (*currt != *currl) return false
    #     ++currt
    #     ++currl
    #   return *currt == '\n'
    #
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    51/push-ecx
    52/push-edx
    53/push-ebx
    56/push-esi
    57/push-edi
    # edx = line
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .                         2/r32/edx   0xc/disp8       .                 # copy *(ebp+12) to edx
    # var currl/esi: (addr byte) = line->data
    # . esi = line/edx->data
    8d/copy-address                 1/mod/*+disp8   2/rm32/edx    .           .             .           6/r32/esi   4/disp8         .                 # copy edx+4 to esi
    # var maxl/ecx: (addr byte) = &line->data[line->size]
    # . eax = line/edx->size
    8b/copy                         0/mod/indirect  2/rm32/edx    .           .                         0/r32/eax   .               .                 # copy *edx to eax
    # . maxl = &line->data[line->size]
    8d/copy-address                 0/mod/indirect  4/rm32/sib    6/base/esi  0/index/eax   .           1/r32/ecx   .               .                 # copy edx+eax to ecx
    # edi = t
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .                         7/r32/edi   8/disp8         .                 # copy *(ebp+8) to edi
    # var ebx: (addr byte) = t->data
    8d/copy-address                 1/mod/*+disp8   7/rm32/edi    .           .             .           3/r32/ebx   0xc/disp8       .                 # copy edi+12 to ebx
    # var maxt/edx: (addr byte) = &t->data[t->write]
    # . eax = t->write
    8b/copy                         0/mod/indirect  7/rm32/edi    .           .                         0/r32/eax   .               .                 # copy *edi to eax
    # . maxt = &t->data[t->write]
    8d/copy-address                 0/mod/indirect  4/rm32/sib    3/base/ebx  0/index/eax   .           2/r32/edx   .               .                 # copy ebx+eax to edx
    # var currt/edi: (addr byte) = &t->data[t->read]
    # . eax = t/edi->read
    8b/copy                         1/mod/*+disp8   7/rm32/edi    .           .                         0/r32/eax   4/disp8         .                 # copy *(edi+4) to eax
    # . currt = &t->data[t->read]
    8d/copy-address                 0/mod/indirect  4/rm32/sib    3/base/ebx  0/index/eax   .           7/r32/edi   .               .                 # copy ebx+eax to edi
$next-line-matches?:loop:
    # if (currl >= maxl) break
    39/compare                      3/mod/direct    6/rm32/esi    .           .             .           1/r32/ecx   .               .                 # compare esi and ecx
    73/jump-if-addr>=  $next-line-matches?:break/disp8
    # if (currt >= maxt) return false
    # . eax = false
    b8/copy-to-eax  0/imm32/false
    39/compare                      3/mod/direct    7/rm32/edi    .           .             .           2/r32/edx   .               .                 # compare edi and edx
    73/jump-if-addr>=  $next-line-matches?:end/disp8
    # if (*currt != *currl) return false
    31/xor                          3/mod/direct    0/rm32/eax    .           .             .           0/r32/eax   .               .                 # clear eax
    31/xor                          3/mod/direct    3/rm32/eax    .           .             .           3/r32/eax   .               .                 # clear ebx
    # . eax: byte = *currt
    8a/copy-byte                    0/mod/indirect  7/rm32/edi    .           .                         0/r32/eax   .               .                 # copy *edi to eax
    # . ebx: byte = *currl
    8a/copy-byte                    0/mod/indirect  6/rm32/esi    .           .                         3/r32/ebx   .               .                 # copy *esi to ebx
    # . eax >= ebx
    39/compare                      3/mod/direct    0/rm32/eax    .           .             .           3/r32/ebx   .               .                 # compare eax and ebx
    # . eax = false
    b8/copy-to-eax  0/imm32/false
    75/jump-if-!=  $next-line-matches?:end/disp8
    # ++currt
    47/increment-edi
    # ++currl
    46/increment-esi
    eb/jump  $next-line-matches?:loop/disp8
$next-line-matches?:break:
    # return *currt == '\n'
    31/xor                          3/mod/direct    0/rm32/eax    .           .             .           0/r32/eax   .               .                 # clear eax
    # . eax: byte = *currt
    8a/copy-byte                    0/mod/indirect  7/rm32/edi    .           .                         0/r32/eax   .               .                 # copy *edi to eax
    3d/compare-eax-and  0xa/imm32/newline
    # . eax = false
    b8/copy-to-eax  1/imm32/true
    74/jump-if-=  $next-line-matches?:end/disp8
    b8/copy-to-eax  0/imm32/true
$next-line-matches?: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/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-next-line-matches?-no-match-1:
    # next line of "ABABA" does not match "blah blah"
    # . eax = next-line-matches?(_test-stream-line-ABABA, "blah blah")
    # . . push args
    68/push  "blah blah"/imm32
    68/push  _test-stream-line-ABABA/imm32
    # . . call
    e8/call  next-line-matches?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # . check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-next-line-matches?-no-match-1"/imm32
    68/push  0/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    c3/return

test-next-line-matches?-no-match-2:
    # next line of "ABABA" does not match ""
    # . eax = next-line-matches?(_test-stream-line-ABABA, "")
    # . . push args
    68/push  ""/imm32
    68/push  _test-stream-line-ABABA/imm32
    # . . call
    e8/call  next-line-matches?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # . check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-next-line-matches?-no-match-2"/imm32
    68/push  0/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    c3/return

test-next-line-matches?-no-match-3:
    # next line of "ABABA" does not match  "AA"
    # . eax = next-line-matches?(_test-stream-line-ABABA, "AA")
    # . . push args
    68/push  "AA"/imm32
    68/push  _test-stream-line-ABABA/imm32
    # . . call
    e8/call  next-line-matches?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # . check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-next-line-matches?-no-match-3"/imm32
    68/push  0/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    c3/return

test-next-line-matches?-match:
    # next line of "ABABA" matches "ABABA"
    # . eax = next-line-matches?(_test-stream-line-ABABA, "ABABA")
    # . . push args
    68/push  "ABABA"/imm32
    68/push  _test-stream-line-ABABA/imm32
    # . . call
    e8/call  next-line-matches?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # . check-ints-equal(eax, 1, msg)
    # . . push args
    68/push  "F - test-next-line-matches?-match"/imm32
    68/push  1/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    c3/return

# move t->read to _after_ next newline
skip-next-line:  # t: (addr stream byte)
    # pseudocode:
    #   max = &t->data[t->write]
    #   i = t->read
    #   curr = &t->data[t->read]
    #   while true
    #     if (curr >= max) break
    #     ++i
    #     if (*curr == '\n') break
    #     ++curr
    #   t->read = i
    #
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    50/push-eax
    51/push-ecx
    52/push-edx
    53/push-ebx
    # ecx = t
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .                         1/r32/ecx   8/disp8         .                 # copy *(ebp+8) to ecx
    # edx = t->data
    8d/copy-address                 1/mod/*+disp8   1/rm32/ecx    .           .             .           2/r32/edx   0xc/disp8       .                 # copy ecx+12 to edx
    # eax = t->write
    8b/copy                         0/mod/indirect  1/rm32/ecx    .           .             .           0/r32/eax   .               .                 # copy *ecx to eax
    # var max/ebx: (addr byte) = &t->data[t->write]
    8d/copy-address                 0/mod/indirect  4/rm32/sib    2/base/edx  0/index/eax   .           3/r32/ebx   .               .                 # copy edx+eax to ebx
    # eax = t->read
    8b/copy                         1/mod/*+disp8   1/rm32/ecx    .           .             .           0/r32/eax   4/disp8         .                 # copy *(ecx+4) to edx
    # var curr/ecx: (addr byte) = &t->data[t->read]
    8d/copy-address                 0/mod/indirect  4/rm32/sib    2/base/edx  0/index/eax   .           1/r32/ecx   .               .                 # copy edx+eax to ecx
    # var i/edx: int = t->read
    89/copy                         3/mod/direct    2/rm32/edx    .           .             .           0/r32/eax   .               .                 # copy eax to edx
$skip-next-line:loop:
    # if (curr >= max) break
    39/compare                      3/mod/direct    1/rm32/ecx    .           .             .           3/r32/ebx   .               .                 # compare ecx and ebx
    73/jump-if-addr>=  $skip-next-line:end/disp8
    # ++i
    42/increment-edx
    # if (*curr == '\n') break
    31/xor                          3/mod/direct    0/rm32/eax    .           .             .           0/r32/eax   .               .                 # clear eax
    8a/copy-byte                    0/mod/indirect  1/rm32/ecx    .           .             .           0/r32/eax   .               .                 # copy *ecx to eax
    3d/compare-eax-and  0a/imm32/newline
    74/jump-if-=  $skip-next-line:end/disp8
    # ++curr
    41/increment-ecx
    # loop
    eb/jump  $skip-next-line:loop/disp8
$skip-next-line:end:
    # ecx = t
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .                         1/r32/ecx   8/disp8         .                 # copy *(ebp+8) to ecx
    # t->read = i
    89/copy                         1/mod/*+disp8   1/rm32/ecx    .           .             .           2/r32/edx   4/disp8         .                 # copy edx to *(ecx+4)
    # . restore registers
    5b/pop-to-ebx
    5a/pop-to-edx
    59/pop-to-ecx
    58/pop-to-eax
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-skip-next-line-empty:
    # skipping next line in empty stream leaves read pointer at 0
    # . skip-next-line(_test-stream-empty)
    # . . push args
    68/push  _test-stream-empty/imm32
    # . . call
    e8/call  skip-next-line/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . check-ints-equal(_test-stream-empty->read, 0, msg)
    # . . push args
    68/push  "F - test-skip-next-line-empty"/imm32
    68/push  0/imm32
    b8/copy-to-eax  _test-stream-empty/imm32
    8b/copy                         1/mod/*+disp8   0/rm32/eax    .           .             .           0/r32/eax   4/disp8         .                 # copy *(eax+4) to eax
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    c3/return

test-skip-next-line-filled:
    # skipping next line increments read pointer by length of line + 1 (for newline)
    # . skip-next-line(_test-stream-filled)
    # . . push args
    68/push  _test-stream-filled/imm32
    # . . call
    e8/call  skip-next-line/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . check-ints-equal(_test-stream-filled->read, 5, msg)
    # . . push args
    68/push  "F - test-skip-next-line-filled"/imm32
    68/push  5/imm32
    b8/copy-to-eax  _test-stream-filled/imm32
    8b/copy                         1/mod/*+disp8   0/rm32/eax    .           .             .           0/r32/eax   4/disp8         .                 # copy *(eax+4) to eax
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    c3/return

clear-trace-stream:
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # clear-stream(*Trace-stream)
    # . . push args
    ff          6/subop/push        0/mod/indirect  5/rm32/.disp32            .             .           .           Trace-stream/disp32               # push *Trace-stream
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
$clear-trace-stream:end:
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

# - helpers

# 3-argument variant of _append
_append-3:  # out: (addr byte), outend: (addr byte), s: (addr array byte) -> num_bytes_appended/eax
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    51/push-ecx
    # eax = _append-4(out, outend, &s->data[0], &s->data[s->size])
    # . . push &s->data[s->size]
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .                         0/r32/eax   0x10/disp8      .                 # copy *(ebp+16) to eax
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    51/push-ecx
    # . . push &s->data[0]
    8d/copy-address                 1/mod/*+disp8   0/rm32/eax    .           .             .           1/r32/ecx   4/disp8         .                 # copy eax+4 to ecx
    51/push-ecx
    # . . push outend
    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0xc/disp8       .                 # push *(ebp+12)
    # . . push out
    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           8/disp8         .                 # push *(ebp+8)
    # . . call
    e8/call  _append-4/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0x10/imm32        # add to esp
$_append-3:end:
    # . restore registers
    59/pop-to-ecx
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

# 4-argument variant of _append
_append-4:  # out: (addr byte), outend: (addr byte), in: (addr byte), inend: (addr byte) -> num_bytes_appended/eax: int
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    51/push-ecx
    52/push-edx
    53/push-ebx
    56/push-esi
    57/push-edi
    # num_bytes_appended = 0
    b8/copy-to-eax  0/imm32
    # edi = out
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           7/r32/edi   8/disp8         .                 # copy *(ebp+8) to edi
    # edx = outend
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           2/r32/edx   0xc/disp8       .                 # copy *(ebp+12) to edx
    # esi = in
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           6/r32/esi   0x10/disp8      .                 # copy *(ebp+16) to esi
    # ecx = inend
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           1/r32/ecx   0x14/disp8      .                 # copy *(ebp+20) to ecx
$_append-4:loop:
    # if (in >= inend) break
    39/compare                      3/mod/direct    6/rm32/esi    .           .             .           1/r32/ecx   .               .                 # compare esi with ecx
    73/jump-if-addr>=  $_append-4:end/disp8
    # if (out >= outend) abort  # just to catch test failures fast
    39/compare                      3/mod/direct    7/rm32/edi    .           .             .           2/r32/edx   .               .                 # compare edi with edx
    73/jump-if-addr>=  $_append-4:abort/disp8
    # *out = *in
    8a/copy-byte                    0/mod/indirect  6/rm32/esi    .           .             .           3/r32/BL    .               .                 # copy byte at *esi to BL
    88/copy-byte                    0/mod/indirect  7/rm32/edi    .           .             .           3/r32/BL    .               .                 # copy byte at BL to *edi
    # ++num_bytes_appended
    40/increment-eax
    # ++in
    46/increment-esi
    # ++out
    47/increment-edi
    eb/jump  $_append-4:loop/disp8
$_append-4: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/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

$_append-4:abort:
    # . _write(2/stderr, error)
    # . . push args
    68/push  "stream overflow\n"/imm32
    68/push  2/imm32/stderr
    # . . call
    e8/call  _write/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # . syscall(exit, 1)
    bb/copy-to-ebx  1/imm32
    e8/call  syscall_exit/disp32
    # never gets here

== data

_test-stream-line-ABABA:  # (stream byte)
    # write
    8/imm32
    # read
    0/imm32
    # size
    8/imm32
    # data
    41 42 41 42 41 0a 00 00  # 8 bytes

_test-stream-empty:  # (stream byte)
    # write
    0/imm32
    # read
    0/imm32
    # size
    8/imm32
    # data
    00 00 00 00 00 00 00 00  # 8 bytes

_test-stream-filled:  # (stream byte)
    # write
    8/imm32
    # read
    0/imm32
    # size
    8/imm32
    # data
    41 41 41 41 0a 41 41 41  # 8 bytes

# . . vim:nowrap:textwidth=0