diff options
| author | Kartik Agaram <vc@akkartik.com> | 2019-06-30 22:33:57 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2019-07-01 23:09:58 -0700 |
| commit | 4d0a047f65eae8521d9ff936c7139db01a11f6f6 (patch) | |
| tree | d10187afda5b91773e0c01ce05839d0684793601 /subx/072slice.subx | |
| parent | 51c311d5f9bf028c7a3967525062a96bd4b13b40 (diff) | |
| download | mu-4d0a047f65eae8521d9ff936c7139db01a11f6f6.tar.gz | |
.
Diffstat (limited to 'subx/072slice.subx')
| -rw-r--r-- | subx/072slice.subx | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/subx/072slice.subx b/subx/072slice.subx index c9836429..3aff095d 100644 --- a/subx/072slice.subx +++ b/subx/072slice.subx @@ -697,6 +697,119 @@ test-slice-starts-with-fails-2: 5d/pop-to-EBP c3/return +# write a slice to a stream +# abort if the stream doesn't have enough space +write-slice: # out : (address stream), s : (address slice) + # . prolog + 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 + 56/push-ESI + 57/push-EDI + # ESI = s + 8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 6/r32/ESI 0xc/disp8 . # copy *(EBP+12) to ESI + # curr/ECX = s->start + 8b/copy 0/mod/indirect 6/rm32/ESI . . . 1/r32/ECX . . # copy *ESI to ECX + # max/ESI = s->end + 8b/copy 1/mod/*+disp8 6/rm32/ESI . . . 6/r32/ESI 4/disp8 . # copy *(ESI+4) to ESI + # EDI = out + 8b/copy 1/mod/*+disp8 5/rm32/EBP . . 7/r32/EDI 8/disp8 . # copy *(EBP+8) to EDI + # EDX = out->length + 8b/copy 1/mod/*+disp8 7/rm32/EDI . . . 2/r32/EDX 8/disp8 . # copy *(EDI+8) to EDX + # EBX = out->write + 8b/copy 0/mod/indirect 7/rm32/EDI . . . 3/r32/EBX . . # copy *EDI to EBX +$write-slice:loop: + # if (curr >= max) break + 39/compare 3/mod/direct 1/rm32/ECX . . . 6/r32/ESI . . # compare ECX with ESI + 73/jump-if-greater-or-equal-unsigned $write-slice:loop-end/disp8 + # if (out->write >= out->length) abort + 39/compare 3/mod/direct 3/rm32/EBX . . . 2/r32/EDX . . # compare EBX with EDX + 7d/jump-if-greater-or-equal $write-slice:abort/disp8 + # out->data[out->write] = *in + # . AL = *in + 31/xor 3/mod/direct 0/rm32/EAX . . . 0/r32/EAX . . # clear EAX + 8a/copy-byte 0/mod/indirect 1/rm32/ECX . . . 0/r32/AL . . # copy byte at *ECX to AL + # . out->data[out->write] = AL + 88/copy-byte 1/mod/*+disp8 4/rm32/sib 7/base/EDI 3/index/EBX . 0/r32/AL 0xc/disp8 . # copy AL to *(EDI+EBX+12) + # ++out->write + 43/increment-EBX + # ++in + 41/increment-ECX + eb/jump $write-slice:loop/disp8 +$write-slice:loop-end: + # persist out->write + 89/copy 0/mod/indirect 7/rm32/EDI . . . 3/r32/EBX . . # copy EBX to *EDI +$write-slice:end: + # . restore registers + 5f/pop-to-EDI + 5e/pop-to-ESI + 5b/pop-to-EBX + 5a/pop-to-EDX + 59/pop-to-ECX + 58/pop-to-EAX + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +$write-slice:abort: + # . _write(2/stderr, error) + # . . push args + 68/push "write-slice: out of space"/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 + b8/copy-to-EAX 1/imm32/exit + cd/syscall 0x80/imm8 + # never gets here + +test-write-slice: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # setup + # . clear-stream(_test-stream) + # . . push args + 68/push _test-stream/imm32 + # . . call + e8/call clear-stream/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # var slice/ECX = "Abc" + 68/push _test-slice-data-3/imm32/end + 68/push _test-slice-data-0/imm32/start + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # write-slice(_test-stream, slice) + # . . push args + 51/push-ECX + 68/push _test-stream/imm32 + # . . call + e8/call write-slice/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # check-stream-equal(_test-stream, "Abc", msg) + # . . push args + 68/push "F - test-write-slice"/imm32 + 68/push "Abc"/imm32 + 68/push _test-stream/imm32 + # . . call + e8/call check-stream-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +# write a slice to a buffered-file write-slice-buffered: # out : (address buffered-file), s : (address slice) # . prolog 55/push-EBP |