Mu - 116write-buffered.subx

From 3350c34a74844e21ea69077e01efff3bae64bdcd Mon Sep 17 00:00:00 2001 From: Kartik Agaram Date: Tue, 23 Mar 2021 17:31:08 -0700 Subject: . --- html/116write-buffered.subx.html | 291 --------------------------------------- 1 file changed, 291 deletions(-) delete mode 100644 html/116write-buffered.subx.html (limited to 'html/116write-buffered.subx.html') diff --git a/html/116write-buffered.subx.html b/html/116write-buffered.subx.html deleted file mode 100644 index adbd7d43..00000000 --- a/html/116write-buffered.subx.html +++ /dev/null @@ -1,291 +0,0 @@ - - - - -Mu - 116write-buffered.subx - - - - - - - - - - -https://github.com/akkartik/mu/blob/main/116write-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: (addr buffered-file), msg: (addr array byte)
-  9     # pseudocode:
- 10     #   in = msg->data
- 11     #   inend = &msg->data[msg->size]
- 12     #   while (in < inend)
- 13     #     if f->write >= f->size
- 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->size: edx
- 26     #   f->write: ebx (cached; need to keep in sync)
- 27     #   c: eax
- 28     #
- 29     # . prologue
- 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     # var in/esi: (addr byte) = msg->data
- 42     8d/copy-address                 1/mod/*+disp8   0/rm32/eax    .           .             .           6/r32/esi   4/disp8         .                 # copy eax+4 to esi
- 43     # var inend/ecx: (addr byte) = &msg->data[msg->size]
- 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->size
- 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-addr>=  $write-buffered:loop-end/disp8
- 56     # if (f->write >= f->size) 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-<  $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 $write-buffered:end:
- 95     # . restore registers
- 96     5f/pop-to-edi
- 97     5e/pop-to-esi
- 98     5b/pop-to-ebx
- 99     5a/pop-to-edx
-100     59/pop-to-ecx
-101     58/pop-to-eax
-102     # . epilogue
-103     89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-104     5d/pop-to-ebp
-105     c3/return
-106 
-107 test-write-buffered:
-108     # - check that write-buffered writes to the file
-109     # setup
-110     # . clear-stream(_test-stream)
-111     # . . push args
-112     68/push  _test-stream/imm32
-113     # . . call
-114     e8/call  clear-stream/disp32
-115     # . . discard args
-116     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-117     # . clear-stream($_test-buffered-file->buffer)
-118     # . . push args
-119     68/push  $_test-buffered-file->buffer/imm32
-120     # . . call
-121     e8/call  clear-stream/disp32
-122     # . . discard args
-123     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-124     # write-buffered(_test-buffered-file, "Abc")
-125     # . . push args
-126     68/push  "Abc"/imm32
-127     68/push  _test-buffered-file/imm32
-128     # . . call
-129     e8/call  write-buffered/disp32
-130     # . . discard args
-131     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-132     # flush(_test-buffered-file)
-133     # . . push args
-134     68/push  _test-buffered-file/imm32
-135     # . . call
-136     e8/call  flush/disp32
-137     # . . discard args
-138     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-139     # check-stream-equal(_test-stream, "Abc", msg)
-140     # . . push args
-141     68/push  "F - test-write-buffered-single"/imm32
-142     68/push  "Abc"/imm32
-143     68/push  _test-stream/imm32
-144     # . . call
-145     e8/call  check-stream-equal/disp32
-146     # . . discard args
-147     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-148     # . end
-149     c3/return
-150 
-151 test-write-buffered-with-intermediate-flush:
-152     # - check that write-buffered flushes in the middle if its buffer fills up
-153     # setup
-154     # . clear-stream(_test-stream)
-155     # . . push args
-156     68/push  _test-stream/imm32
-157     # . . call
-158     e8/call  clear-stream/disp32
-159     # . . discard args
-160     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-161     # . clear-stream($_test-buffered-file->buffer)
-162     # . . push args
-163     68/push  $_test-buffered-file->buffer/imm32
-164     # . . call
-165     e8/call  clear-stream/disp32
-166     # . . discard args
-167     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-168     # _test-stream can hold 8 bytes, but _test-buffered-file can hold only 6.
-169     # Try to write 7 bytes.
-170     # . write-buffered(_test-buffered-file, "Abcdefg")
-171     # . . push args
-172     68/push  "Abcdefg"/imm32
-173     68/push  _test-buffered-file/imm32
-174     # . . call
-175     e8/call  write-buffered/disp32
-176     # . . discard args
-177     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-178     # don't flush
-179     # 6 bytes should still have gotten to _test-stream
-180     # . check-ints-equal(*_test-stream->write, 6, msg)
-181     # . . push args
-182     68/push  "F - test-write-buffered-with-intermediate-flush: flushed data"/imm32
-183     68/push  6/imm32
-184     # . . push *_test-stream->write
-185     b8/copy-to-eax  _test-stream/imm32
-186     ff          6/subop/push        0/mod/indirect  0/rm32/eax    .           .             .           .           .               .                 # push *eax
-187     # . . call
-188     e8/call  check-ints-equal/disp32
-189     # . . discard args
-190     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-191     # and 1 byte should still be in _test-buffered-file
-192     # . check-ints-equal(*_test-buffered-file->write, 1, msg)
-193     # . . push args
-194     68/push  "F - test-write-buffered-with-intermediate-flush: unflushed bytes"/imm32
-195     68/push  1/imm32
-196     # . . push *_test-buffered-file->write
-197     b8/copy-to-eax  _test-buffered-file/imm32
-198     ff          6/subop/push        1/mod/*+disp8   0/rm32/eax    .           .             .           .           4/disp8         .                 # push *(eax+4)
-199     # . . call
-200     e8/call  check-ints-equal/disp32
-201     # . . discard args
-202     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-203     # . end
-204     c3/return
-205 
-206 == data
-207 
-208 # The buffered file for standard error.
-209 Stderr:  # buffered-file
-210     # file descriptor or (addr stream byte)
-211     2/imm32  # standard error
-212 $Stderr->buffer:
-213     # inlined fields for a stream
-214     #   current write index
-215     0/imm32
-216     #   current read index
-217     0/imm32
-218     #   size
-219     8/imm32
-220     #   data
-221     00 00 00 00 00 00 00 00  # 8 bytes
-222 
-223 # TODO: 8 bytes is too small. We'll need to grow the buffer for efficiency. But
-224 # I don't want to type in 1024 bytes here.
-225 
-226 # . . vim:nowrap:textwidth=0
-
- - - -- cgit 1.4.1-2-gfad0