Mu - subx/066write-buffered.subx

From 695f9bf8d0a7d0a871b8ab75270ceb29715d9be3 Mon Sep 17 00:00:00 2001 From: Kartik Agaram Date: Thu, 25 Jul 2019 00:08:23 -0700 Subject: 5468 --- html/subx/066write-buffered.subx.html | 274 ---------------------------------- 1 file changed, 274 deletions(-) delete mode 100644 html/subx/066write-buffered.subx.html (limited to 'html/subx/066write-buffered.subx.html') diff --git a/html/subx/066write-buffered.subx.html b/html/subx/066write-buffered.subx.html deleted file mode 100644 index ffb79b3c..00000000 --- a/html/subx/066write-buffered.subx.html +++ /dev/null @@ -1,274 +0,0 @@ - - - - -Mu - subx/066write-buffered.subx - - - - - - - - - - -https://github.com/akkartik/mu/blob/master/subx/066write-buffered.subx -
-  1 # write-buffered: like 'write', but for a buffered-file
-  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 write-buffered:  # f : (address buffered-file), msg : (address array byte) -> <void>
-  9     # pseudocode:
- 10     #   in = msg->data
- 11     #   inend = &msg->data[msg->length]
- 12     #   while (in < inend)
- 13     #     if f->write >= f->length
- 14     #       flush(f)
- 15     #       clear-stream(f)
- 16     #     c = *in
- 17     #     f->data[f->write] = c
- 18     #     ++f->write
- 19     #     ++in
- 20     #
- 21     # registers:
- 22     #   in: ESI
- 23     #   inend: ECX
- 24     #   f: EDI
- 25     #   f->length: EDX
- 26     #   f->write: EBX (cached; need to keep in sync)
- 27     #   c: EAX
- 28     #
- 29     # . prolog
- 30     55/push-EBP
- 31     89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
- 32     # . save registers
- 33     50/push-EAX
- 34     51/push-ECX
- 35     52/push-EDX
- 36     53/push-EBX
- 37     56/push-ESI
- 38     57/push-EDI
- 39     # EAX = msg
- 40     8b/copy                         1/mod/*+disp8   5/rm32/EBP    .           .                         0/r32/EAX   0xc/disp8       .                 # copy *(EBP+12) to EAX
- 41     # in/ESI = msg->data
- 42     8d/copy-address                 1/mod/*+disp8   0/rm32/EAX    .           .             .           6/r32/ESI   4/disp8         .                 # copy EAX+4 to ESI
- 43     # inend/ECX = &msg->data[msg->length]
- 44     8b/copy                         0/mod/indirect  0/rm32/EAX    .           .             .           1/r32/ECX   .               .                 # copy *EAX to ECX
- 45     8d/copy-address                 0/mod/indirect  4/rm32/sib    6/base/ESI  1/index/ECX   .           1/r32/ECX   .               .                 # copy ESI+ECX to ECX
- 46     # EDI = f
- 47     8b/copy                         1/mod/*+disp8   5/rm32/EBP    .           .                         7/r32/EDI   8/disp8         .                 # copy *(EBP+8) to EDI
- 48     # EDX = f->length
- 49     8b/copy                         1/mod/*+disp8   7/rm32/EDI    .           .             .           2/r32/EDX   0xc/disp8       .                 # copy *(EDI+12) to EDX
- 50     # EBX = f->write
- 51     8b/copy                         1/mod/*+disp8   7/rm32/EDI    .           .             .           3/r32/EBX   4/disp8         .                 # copy *(EDI+4) to EBX
- 52 $write-buffered:loop:
- 53     # if (in >= inend) break
- 54     39/compare                      3/mod/direct    6/rm32/ESI    .           .             .           1/r32/ECX   .               .                 # compare ESI with ECX
- 55     73/jump-if-greater-or-equal-unsigned  $write-buffered:loop-end/disp8
- 56     # if (f->write >= f->length) flush and clear f's stream
- 57     39/compare                      3/mod/direct    3/rm32/EBX    .           .             .           2/r32/EDX   .               .                 # compare EBX with EDX
- 58     7c/jump-if-lesser  $write-buffered:to-stream/disp8
- 59     # . persist f->write
- 60     89/copy                         1/mod/*+disp8   7/rm32/EDI    .           .             .           3/r32/EBX   4/disp8         .                 # copy EBX to *(EDI+4)
- 61     # . flush(f)
- 62     # . . push args
- 63     57/push-EDI
- 64     # . . call
- 65     e8/call  flush/disp32
- 66     # . . discard args
- 67     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
- 68     # . clear-stream(stream = f+4)
- 69     # . . push args
- 70     8d/copy-address                 1/mod/*+disp8   7/rm32/EDI    .           .             .           0/r32/EAX   4/disp8         .                 # copy EDI+4 to EAX
- 71     50/push-EAX
- 72     # . . call
- 73     e8/call  clear-stream/disp32
- 74     # . . discard args
- 75     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
- 76     # . f->write must now be 0; update its cache at EBX
- 77     31/xor                          3/mod/direct    3/rm32/EBX    .           .             .           3/r32/EBX   .               .                 # clear EBX
- 78 $write-buffered:to-stream:
- 79     # write to stream
- 80     # f->data[f->write] = *in
- 81     # . AL = *in
- 82     31/xor                          3/mod/direct    0/rm32/EAX    .           .             .           0/r32/EAX   .               .                 # clear EAX
- 83     8a/copy-byte                    0/mod/indirect  6/rm32/ESI    .           .             .           0/r32/AL    .               .                 # copy byte at *ESI to AL
- 84     # . f->data[f->write] = AL
- 85     88/copy-byte                    1/mod/*+disp8   4/rm32/sib    7/base/EDI  3/index/EBX   .           0/r32/AL    0x10/disp8      .                 # copy AL to *(EDI+EBX+16)
- 86     # ++f->write
- 87     43/increment-EBX
- 88     # ++in
- 89     46/increment-ESI
- 90     eb/jump  $write-buffered:loop/disp8
- 91 $write-buffered:loop-end:
- 92     # persist necessary variables from registers
- 93     89/copy                         1/mod/*+disp8   7/rm32/EDI    .           .             .           3/r32/EBX   4/disp8         .                 # copy EBX to *(EDI+4)
- 94 $write-buffered:end:
- 95     # . restore registers
- 96     5f/pop-to-EDI
- 97     5e/pop-to-ESI
- 98     5b/pop-to-EBX
- 99     5a/pop-to-EDX
-100     59/pop-to-ECX
-101     58/pop-to-EAX
-102     # . epilog
-103     89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
-104     5d/pop-to-EBP
-105     c3/return
-106 
-107 test-write-buffered:
-108     # - check that write-buffered writes to the file
-109     # setup
-110     # . clear-stream(_test-stream)
-111     # . . push args
-112     68/push  _test-stream/imm32
-113     # . . call
-114     e8/call  clear-stream/disp32
-115     # . . discard args
-116     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
-117     # . clear-stream(_test-buffered-file+4)
-118     # . . push args
-119     b8/copy-to-EAX  _test-buffered-file/imm32
-120     05/add-to-EAX  4/imm32
-121     50/push-EAX
-122     # . . call
-123     e8/call  clear-stream/disp32
-124     # . . discard args
-125     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
-126     # write-buffered(_test-buffered-file, "Abc")
-127     # . . push args
-128     68/push  "Abc"/imm32
-129     68/push  _test-buffered-file/imm32
-130     # . . call
-131     e8/call  write-buffered/disp32
-132     # . . discard args
-133     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
-134     # flush(_test-buffered-file)
-135     # . . push args
-136     68/push  _test-buffered-file/imm32
-137     # . . call
-138     e8/call  flush/disp32
-139     # . . discard args
-140     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
-141     # check-stream-equal(_test-stream, "Abc", msg)
-142     # . . push args
-143     68/push  "F - test-write-buffered-single"/imm32
-144     68/push  "Abc"/imm32
-145     68/push  _test-stream/imm32
-146     # . . call
-147     e8/call  check-stream-equal/disp32
-148     # . . discard args
-149     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
-150     # . end
-151     c3/return
-152 
-153 test-write-buffered-with-intermediate-flush:
-154     # - check that write-buffered flushes in the middle if its buffer fills up
-155     # setup
-156     # . clear-stream(_test-stream)
-157     # . . push args
-158     68/push  _test-stream/imm32
-159     # . . call
-160     e8/call  clear-stream/disp32
-161     # . . discard args
-162     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
-163     # . clear-stream(_test-buffered-file+4)
-164     # . . push args
-165     b8/copy-to-EAX  _test-buffered-file/imm32
-166     05/add-to-EAX  4/imm32
-167     50/push-EAX
-168     # . . call
-169     e8/call  clear-stream/disp32
-170     # . . discard args
-171     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
-172     # _test-stream can hold 8 bytes, but _test-buffered-file can hold only 6.
-173     # Try to write 7 bytes.
-174     # . write-buffered(_test-buffered-file, "Abcdefg")
-175     # . . push args
-176     68/push  "Abcdefg"/imm32
-177     68/push  _test-buffered-file/imm32
-178     # . . call
-179     e8/call  write-buffered/disp32
-180     # . . discard args
-181     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
-182     # don't flush
-183     # 6 bytes should still have gotten to _test-stream
-184     # . check-ints-equal(*_test-stream->write, 6, msg)
-185     # . . push args
-186     68/push  "F - test-write-buffered-with-intermediate-flush: flushed data"/imm32
-187     68/push  6/imm32
-188     # . . push *_test-stream->write
-189     b8/copy-to-EAX  _test-stream/imm32
-190     ff          6/subop/push        0/mod/indirect  0/rm32/EAX    .           .             .           .           .               .                 # push *EAX
-191     # . . call
-192     e8/call  check-ints-equal/disp32
-193     # . . discard args
-194     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
-195     # and 1 byte should still be in _test-buffered-file
-196     # . check-ints-equal(*_test-buffered-file->write, 1, msg)
-197     # . . push args
-198     68/push  "F - test-write-buffered-with-intermediate-flush: unflushed bytes"/imm32
-199     68/push  1/imm32
-200     # . . push *_test-buffered-file->write
-201     b8/copy-to-EAX  _test-buffered-file/imm32
-202     ff          6/subop/push        1/mod/*+disp8   0/rm32/EAX    .           .             .           .           4/disp8         .                 # push *(EAX+4)
-203     # . . call
-204     e8/call  check-ints-equal/disp32
-205     # . . discard args
-206     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
-207     # . end
-208     c3/return
-209 
-210 # . . vim:nowrap:textwidth=0
-
- - - -- cgit 1.4.1-2-gfad0