diff options
Diffstat (limited to 'subx/068read-line.subx')
-rw-r--r-- | subx/068read-line.subx | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/subx/068read-line.subx b/subx/068read-line.subx new file mode 100644 index 00000000..5e35ce3c --- /dev/null +++ b/subx/068read-line.subx @@ -0,0 +1,198 @@ +== code +# instruction effective address register displacement immediate +# . op subop mod rm32 base index scale r32 +# . 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 + +# main: + e8/call run-tests/disp32 # 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'. + # syscall(exit, Num-test-failures) + 8b/copy 0/mod/indirect 5/rm32/.disp32 . . 3/r32/EBX Num-test-failures/disp32 # copy *Num-test-failures to EBX + b8/copy-to-EAX 1/imm32/exit + cd/syscall 0x80/imm8 + +# read bytes from 'f' until (and including) a newline and store them into 's' +# return true if no data found, false otherwise +# just abort if 's' is too small +read-line: # f : (address buffered-file), s : (address stream byte) -> eof?/EAX + # pseudocode: + # loop: + # if (s->write >= s->length) abort + # if (f->read >= f->write) populate stream from file + # if (f->write == 0) break + # AL = f->data[f->read] + # s->data[s->write] = AL + # ++f->read + # ++s->write + # if AL == '\n' break + # . prolog + 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 + 56/push-ESI + 57/push-EDI + # ESI = f + 8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 6/r32/ESI 8/disp8 . # copy *(EBP+8) to ESI + # ECX = f->read + 8b/copy 1/mod/*+disp8 6/rm32/ESI . . . 1/r32/ECX 8/disp8 . # copy *(ESI+8) to ECX + # EDI = s + 8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 7/r32/EDI 0xc/disp8 . # copy *(EBP+12) to EDI + # EDX = s->write + 8b/copy 0/mod/indirect 7/rm32/EDI . . . 2/r32/EDX . . # copy *EDI to EDX +$read-line:loop: + # if (s->write >= s->length) abort + 3b/compare 1/mod/*+disp8 7/rm32/EDI . . . 2/r32/EDX 8/disp8 . # compare EDX with *(EDI+8) + 7d/jump-if-greater-or-equal $read-line:abort/disp8 + # if (f->read >= f->write) populate stream from file + 3b/compare 1/mod/*+disp8 6/rm32/ESI . . . 1/r32/ECX 4/disp8 . # compare ECX with *(ESI+4) + 7c/jump-if-lesser $read-line:from-stream/disp8 + # . clear-stream(stream = f+4) + # . . push args + 8d/copy-address 1/mod/*+disp8 6/rm32/ESI . . . 0/r32/EAX 4/disp8 . # copy ESI+4 to EAX + 50/push-EAX + # . . call + e8/call clear-stream/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # . f->read must now be 0; update ECX + 31/xor 3/mod/direct 1/rm32/ECX . . . 1/r32/ECX . . # clear ECX + # . EAX = read(f->fd, stream = f+4) + # . . push args + 50/push-EAX + ff 6/subop/push 0/mod/indirect 6/rm32/ESI . . . . . . # push *ESI + # . . call + e8/call read/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # if f->write == 0 return true + # . if EAX == 0 return true + 81 7/subop/compare 3/mod/direct 0/rm32/EAX . . . . . 0/imm32 # compare EAX + 75/jump-if-not-equal $read-line:from-stream/disp8 + b8/copy-to-EAX 0xffffffff/imm32 + eb/jump $read-line:end/disp8 +$read-line:from-stream: + # AL = f->data[f->read] + 31/xor 3/mod/direct 0/rm32/EAX . . . 0/r32/EAX . . # clear EAX + 8a/copy-byte 1/mod/*+disp8 4/rm32/sib 6/base/ESI 1/index/ECX . 0/r32/AL 0x10/disp8 . # copy byte at *(ESI+ECX+16) to AL + # s->data[s->write] = AL + 88/copy-byte 1/mod/*+disp8 4/rm32/sib 7/base/EDI 2/index/EDX . 0/r32/AL 0xc/disp8 . # copy AL to *(EDI+EDX+12) + # ++f->read + 41/increment-ECX + # ++s->write + 42/increment-EDX + # if AL == '\n' return false + 81 7/subop/compare 3/mod/direct 0/rm32/EAX . . . . . 0xa/imm32 # compare EAX + 75/jump-if-not-equal $read-line:loop/disp8 + 31/xor 3/mod/direct 0/rm32/EAX . . . 0/r32/EAX . . # clear EAX +$read-line:end: + # save f->read + 89/copy 1/mod/*+disp8 6/rm32/ESI . . . 1/r32/ECX 8/disp8 . # copy ECX to *(ESI+8) + # save s->write + 89/copy 0/mod/indirect 7/rm32/EDI . . . 2/r32/EDX . . # copy EDX to *EDI + # . restore registers + 5f/pop-to-EDI + 5e/pop-to-ESI + 5a/pop-to-EDX + 59/pop-to-ECX + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +$read-line:abort: + # . _write(2/stderr, error) + # . . push args + 68/push "read-line: line too long"/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-read-line: + # - check that read-line stops at a newline + # 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 + # . clear-stream(_test-buffered-file+4) + # . . push args + b8/copy-to-EAX _test-buffered-file/imm32 + 05/add-to-EAX 4/imm32 + 50/push-EAX + # . . call + e8/call clear-stream/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # write(_test-stream, "ab\ncd") + # . write(_test-stream, "ab") + # . . push args + 68/push "ab"/imm32 + 68/push _test-stream/imm32 + # . . call + e8/call write/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # . write(_test-stream, "\n") + # . . push args + 68/push Newline/imm32 + 68/push _test-stream/imm32 + # . . call + e8/call write/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # . write(_test-stream, "cd") + # . . push args + 68/push "cd"/imm32 + 68/push _test-stream/imm32 + # . . call + e8/call write/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # read a line from _test-stream (buffered by _test-buffered-file) into _test-stream-buffer + # . EAX = read-line(_test-buffered-file, _test-stream-buffer) + # . . push args + 68/push _test-stream-buffer/imm32 + 68/push _test-buffered-file/imm32 + # . . call + e8/call read-line/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # check-ints-equal(EAX, 0/not-at-eof, msg) + # . . push args + 68/push "F - test-read-line: return value"/imm32 + 68/push 0/imm32/not-at-eof + 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 + # check-ints-equal(*_test-stream-buffer->data, 61/a 62/b 0a/newline 00, msg) + # . . push args + 68/push "F - test-read-line"/imm32 + 68/push 0x000a6261/imm32 + # . . push *_test-stream->data + b8/copy-to-EAX _test-stream-buffer/imm32 + ff 6/subop/push 1/mod/*+disp8 0/rm32/EAX . . . . 0xc/disp8 . # push *(EAX+12) + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # end + c3/return + +#? test-read-line-returns-true-on-eof: +#? +#? test-read-line-reads-final-line-until-eof: + +# . . vim:nowrap:textwidth=0 |