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author | Kartik Agaram <vc@akkartik.com> | 2019-02-03 23:29:46 -0800 |
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committer | Kartik Agaram <vc@akkartik.com> | 2019-02-03 23:29:46 -0800 |
commit | 51b4f888dd20653bb218f06e1221a7007446fcd5 (patch) | |
tree | 7458e3eebfc7e5df9903219603d5f8cda87f74af /subx/070read-line.subx | |
parent | 03c6f1d3858ff0fdb6af6ce4b61bea51f16b33be (diff) | |
download | mu-51b4f888dd20653bb218f06e1221a7007446fcd5.tar.gz |
4950
Diffstat (limited to 'subx/070read-line.subx')
-rw-r--r-- | subx/070read-line.subx | 312 |
1 files changed, 0 insertions, 312 deletions
diff --git a/subx/070read-line.subx b/subx/070read-line.subx deleted file mode 100644 index 961fc521..00000000 --- a/subx/070read-line.subx +++ /dev/null @@ -1,312 +0,0 @@ -== 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 its cache at 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 - # . clear-stream(_test-stream-buffer) - # . . push args - 68/push _test-stream-buffer/imm32 - # . . 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: - # 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 - # . clear-stream(_test-stream-buffer) - # . . push args - 68/push _test-stream-buffer/imm32 - # . . call - e8/call clear-stream/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP - # write nothing - # 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, eof, msg) - # . . push args - 68/push "F - test-read-line-returns-true-on-eof"/imm32 - 68/push 0xffffffff/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 - # end - c3/return - -test-read-line-reads-final-line-until-eof: - # 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 - # . clear-stream(_test-stream-buffer) - # . . push args - 68/push _test-stream-buffer/imm32 - # . . 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, "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, eof, msg) - # . . push args - 68/push "F - test-read-line-reads-final-line-until-eof: return value"/imm32 - 68/push 0xffffffff/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, 63/c 64/d 00 00, msg) - # . . push args - 68/push "F - test-read-line-reads-final-line-until-eof"/imm32 - 68/push 0x00006463/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 - -# . . vim:nowrap:textwidth=0 |