Mu - subx/062write-stream.subx

From 6e1eeeebfb453fa7c871869c19375ce60fbd7413 Mon Sep 17 00:00:00 2001 From: Kartik Agaram Date: Sat, 27 Jul 2019 16:01:55 -0700 Subject: 5485 - promote SubX to top-level --- html/062write-stream.subx.html | 320 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 320 insertions(+) create mode 100644 html/062write-stream.subx.html (limited to 'html/062write-stream.subx.html') diff --git a/html/062write-stream.subx.html b/html/062write-stream.subx.html new file mode 100644 index 00000000..f7b05f1e --- /dev/null +++ b/html/062write-stream.subx.html @@ -0,0 +1,320 @@ + + + + +Mu - subx/062write-stream.subx + + + + + + + + + + +https://github.com/akkartik/mu/blob/master/subx/062write-stream.subx +
+  1 # write-stream: like write, but write streams rather than strings
+  2 
+  3 == code
+  4 #   instruction                     effective address                                                   register    displacement    immediate
+  5 # . op          subop               mod             rm32          base        index         scale       r32
+  6 # . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes
+  7 
+  8 #? Entry:  # manual test
+  9 #?     # write-stream(stdout, _test-stream2)
+ 10 #?     68/push  _test-stream2/imm32
+ 11 #?     68/push  1/imm32/stdout
+ 12 #?     e8/call write-stream/disp32
+ 13 #?     # syscall(exit, Num-test-failures)
+ 14 #?     8b/copy                         0/mod/indirect  5/rm32/.disp32            .             .           3/r32/EBX   Num-test-failures/disp32          # copy *Num-test-failures to EBX
+ 15 #?     b8/copy-to-EAX  1/imm32/exit
+ 16 #?     cd/syscall  0x80/imm8
+ 17 
+ 18 write-stream:  # f : fd or (address stream), s : (address stream) -> <void>
+ 19     # . prolog
+ 20     55/push-EBP
+ 21     89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
+ 22     # if (f < 0x08000000) _write-stream(f, s), return  # f can't be a user-mode address, so treat it as a kernel file descriptor
+ 23     81          7/subop/compare     1/mod/*+disp8   5/rm32/EBP    .           .             .           .           8/disp8         0x08000000/imm32  # compare *(EBP+8)
+ 24     73/jump-if-greater-unsigned-or-equal  $write-stream:fake/disp8
+ 25     # . . push args
+ 26     ff          6/subop/push        1/mod/*+disp8   5/rm32/EBP    .           .             .           .           0xc/disp8       .                 # push *(EBP+12)
+ 27     ff          6/subop/push        1/mod/*+disp8   5/rm32/EBP    .           .             .           .           8/disp8         .                 # push *(EBP+8)
+ 28     # . . call
+ 29     e8/call  _write-stream/disp32
+ 30     # . . discard args
+ 31     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+ 32     eb/jump  $write-stream:end/disp8
+ 33 $write-stream:fake:
+ 34     # otherwise, treat 'f' as a stream to append to
+ 35     # . save registers
+ 36     50/push-EAX
+ 37     56/push-ESI
+ 38     57/push-EDI
+ 39     # EDI = f
+ 40     8b/copy                         1/mod/*+disp8   5/rm32/EBP    .           .                         7/r32/EDI   8/disp8         .                 # copy *(EBP+8) to EDI
+ 41     # ESI = s
+ 42     8b/copy                         1/mod/*+disp8   5/rm32/EBP    .           .                         6/r32/ESI   0xc/disp8       .                 # copy *(EBP+12) to ESI
+ 43     # EAX = _append-4(&f->data[f->write], &f->data[f->length], &s->data[s->read], &s->data[s->write])
+ 44     # . . push &s->data[s->write]
+ 45     8b/copy                         0/mod/indirect  6/rm32/ESI    .           .             .           0/r32/EAX   .               .                 # copy *ESI to EAX
+ 46     8d/copy-address                 1/mod/*+disp8   4/rm32/sib    6/base/ESI  0/index/EAX   .           0/r32/EAX   0xc/disp8       .                 # copy ESI+EAX+12 to EAX
+ 47     50/push-EAX
+ 48     # . . push &s->data[s->read]
+ 49     8b/copy                         1/mod/*+disp8   6/rm32/ESI    .           .             .           0/r32/EAX   4/disp8         .                 # copy *(ESI+4) to EAX
+ 50     8d/copy-address                 1/mod/*+disp8   4/rm32/sib    6/base/ESI  0/index/EAX   .           0/r32/EAX   0xc/disp8       .                 # copy ESI+EAX+12 to EAX
+ 51     50/push-EAX
+ 52     # . . push &f->data[f->length]
+ 53     8b/copy                         1/mod/*+disp8   7/rm32/EDI    .           .             .           0/r32/EAX   8/disp8         .                 # copy *(EDI+8) to EAX
+ 54     8d/copy-address                 1/mod/*+disp8   4/rm32/sib    7/base/EDI  0/index/EAX   .           0/r32/EAX   0xc/disp8       .                 # copy EDI+EAX+12 to EAX
+ 55     50/push-EAX
+ 56     # . . push &f->data[f->write]
+ 57     8b/copy                         0/mod/indirect  7/rm32/EDI    .           .             .           0/r32/EAX   .               .                 # copy *EDI to EAX
+ 58     8d/copy-address                 1/mod/*+disp8   4/rm32/sib    7/base/EDI  0/index/EAX   .           0/r32/EAX   0xc/disp8       .                 # copy EDI+EAX+12 to EAX
+ 59     50/push-EAX
+ 60     # . . call
+ 61     e8/call  _append-4/disp32
+ 62     # . . discard args
+ 63     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0x10/imm32        # add to ESP
+ 64     # f->write += EAX
+ 65     01/add                          0/mod/indirect  7/rm32/EDI    .           .             .           0/r32/EAX   .               .                 # add EAX to *EDI
+ 66     # s->read += EAX
+ 67     01/add                          1/mod/*+disp8   6/rm32/ESI    .           .             .           0/r32/EAX   4/disp8         .                 # add EAX to *(ESI+4)
+ 68     # . restore registers
+ 69     5f/pop-to-EDI
+ 70     5e/pop-to-ESI
+ 71     58/pop-to-EAX
+ 72 $write-stream:end:
+ 73     # . epilog
+ 74     89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
+ 75     5d/pop-to-EBP
+ 76     c3/return
+ 77 
+ 78 _write-stream:  # fd : int, s : (address stream) -> <void>
+ 79     # . prolog
+ 80     55/push-EBP
+ 81     89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
+ 82     # . save registers
+ 83     50/push-EAX
+ 84     51/push-ECX
+ 85     52/push-EDX
+ 86     53/push-EBX
+ 87     56/push-ESI
+ 88     57/push-EDI
+ 89     # ESI = s
+ 90     8b/copy                         1/mod/*+disp8   5/rm32/EBP    .           .             .           6/r32/ESI   0xc/disp8       .                 # copy *(EBP+12) to ESI
+ 91     # EDI = s->read
+ 92     8b/copy                         1/mod/*+disp8   6/rm32/ESI    .           .             .           7/r32/EDI   4/disp8         .                 # copy *(ESI+4) to EDI
+ 93     # EDX = s->write
+ 94     8b/copy                         0/mod/indirect  6/rm32/ESI    .           .             .           2/r32/EDX   .               .                 # copy *ESI to EDX
+ 95     # syscall(write, fd, &s->data[s->read], s->write - s->read)
+ 96     # . . fd : EBX
+ 97     8b/copy                         1/mod/*+disp8   5/rm32/EBP    .           .             .           3/r32/EBX   8/disp8         .                 # copy *(EBP+8) to EBX
+ 98     # . . data : ECX = &s->data[s->read]
+ 99     8d/copy-address                 1/mod/*+disp8   4/rm32/sib    6/base/ESI  7/index/EDI   .           1/r32/ECX   0xc/disp8       .                 # copy ESI+EDI+12 to ECX
+100     # . . size : EDX = s->write - s->read
+101     29/subtract                     3/mod/direct    2/rm32/EDX    .           .             .           7/r32/EDI   .               .                 # subtract EDI from EDX
+102     # . . syscall
+103     b8/copy-to-EAX  4/imm32/write
+104     cd/syscall  0x80/imm8
+105     # if (EAX < 0) abort
+106     3d/compare-EAX-with  0/imm32
+107     0f 8c/jump-if-lesser  $_write-stream:abort/disp32
+108     # s->read += EAX
+109     01/add                          1/mod/*+disp8   6/rm32/ESI    .           .             .           0/r32/EAX   4/disp8         .                 # add EAX to *(ESI+4)
+110     # . restore registers
+111     5f/pop-to-EDI
+112     5e/pop-to-ESI
+113     5b/pop-to-EBX
+114     5a/pop-to-EDX
+115     59/pop-to-ECX
+116     58/pop-to-EAX
+117     # . epilog
+118     89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
+119     5d/pop-to-EBP
+120     c3/return
+121 
+122 $_write-stream:abort:
+123     # . _write(2/stderr, error)
+124     # . . push args
+125     68/push  "_write-stream: failed to write to file\n"/imm32
+126     68/push  2/imm32/stderr
+127     # . . call
+128     e8/call  _write/disp32
+129     # . . discard args
+130     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+131     # . syscall(exit, 1)
+132     bb/copy-to-EBX  1/imm32
+133     b8/copy-to-EAX  1/imm32/exit
+134     cd/syscall  0x80/imm8
+135     # never gets here
+136 
+137 test-write-stream-single:
+138     # setup
+139     # . clear-stream(_test-stream)
+140     # . . push args
+141     68/push  _test-stream/imm32
+142     # . . call
+143     e8/call  clear-stream/disp32
+144     # . . discard args
+145     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
+146     # . clear-stream(_test-stream2)
+147     # . . push args
+148     68/push  _test-stream2/imm32
+149     # . . call
+150     e8/call  clear-stream/disp32
+151     # . . discard args
+152     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
+153     # . write(_test-stream2, "Ab")
+154     # . . push args
+155     68/push  "Ab"/imm32
+156     68/push  _test-stream2/imm32
+157     # . . call
+158     e8/call  write/disp32
+159     # . . discard args
+160     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+161     # write-stream(_test-stream, _test-stream2)
+162     # . . push args
+163     68/push  _test-stream2/imm32
+164     68/push  _test-stream/imm32
+165     # . . call
+166     e8/call  write-stream/disp32
+167     # . . discard args
+168     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+169     # check-stream-equal(_test-stream, "Ab", msg)
+170     # . . push args
+171     68/push  "F - test-write-stream-single"/imm32
+172     68/push  "Ab"/imm32
+173     68/push  _test-stream/imm32
+174     # . . call
+175     e8/call  check-stream-equal/disp32
+176     # . . discard args
+177     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
+178     # . end
+179     c3/return
+180 
+181 test-write-stream-appends:
+182     # setup
+183     # . clear-stream(_test-stream)
+184     # . . push args
+185     68/push  _test-stream/imm32
+186     # . . call
+187     e8/call  clear-stream/disp32
+188     # . . discard args
+189     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
+190     # . clear-stream(_test-stream2)
+191     # . . push args
+192     68/push  _test-stream2/imm32
+193     # . . call
+194     e8/call  clear-stream/disp32
+195     # . . discard args
+196     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
+197     # . write(_test-stream2, "C")
+198     # . . push args
+199     68/push  "C"/imm32
+200     68/push  _test-stream2/imm32
+201     # . . call
+202     e8/call  write/disp32
+203     # . . discard args
+204     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+205     # first write
+206     # . write-stream(_test-stream, _test-stream2)
+207     # . . push args
+208     68/push  _test-stream2/imm32
+209     68/push  _test-stream/imm32
+210     # . . call
+211     e8/call  write-stream/disp32
+212     # . . discard args
+213     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+214     # second write
+215     # . write(_test-stream2, "D")
+216     # . . push args
+217     68/push  "D"/imm32
+218     68/push  _test-stream2/imm32
+219     # . . call
+220     e8/call  write/disp32
+221     # . . discard args
+222     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+223     # . write-stream(_test-stream, _test-stream2)
+224     # . . push args
+225     68/push  _test-stream2/imm32
+226     68/push  _test-stream/imm32
+227     # . . call
+228     e8/call  write-stream/disp32
+229     # . . discard args
+230     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+231     # check-stream-equal(_test-stream, "CD", msg)
+232     # . . push args
+233     68/push  "F - test-write-stream-appends"/imm32
+234     68/push  "CD"/imm32
+235     68/push  _test-stream/imm32
+236     # . . call
+237     e8/call  check-stream-equal/disp32
+238     # . . discard args
+239     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
+240     # . end
+241     c3/return
+242 
+243 == data
+244 
+245 _test-stream2:
+246     # current write index
+247     4/imm32
+248     # current read index
+249     1/imm32
+250     # length
+251     8/imm32
+252     # data
+253     41/A 42/B 43/C 44/D 00 00 00 00  # 8 bytes
+254 
+255 # . . vim:nowrap:textwidth=0
+
+ + + -- cgit 1.4.1-2-gfad0