diff options
Diffstat (limited to 'subx/066print-byte.subx')
-rw-r--r-- | subx/066print-byte.subx | 93 |
1 files changed, 82 insertions, 11 deletions
diff --git a/subx/066print-byte.subx b/subx/066print-byte.subx index 39d7793e..80a29a0c 100644 --- a/subx/066print-byte.subx +++ b/subx/066print-byte.subx @@ -5,7 +5,7 @@ # . 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 -print-byte: # f : (address buffered-file), n : int -> <void> +append-byte-hex: # f : (address stream), n : int -> <void> # . prolog 55/push-EBP 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP @@ -17,12 +17,12 @@ print-byte: # f : (address buffered-file), n : int -> <void> 25/and-EAX 0xf/imm32 # . AL = to-hex-char(AL) e8/call to-hex-char/disp32 - # write-byte(f, AL) + # append-byte(f, AL) # . . push args 50/push-EAX ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8) # . . call - e8/call write-byte/disp32 + e8/call append-byte/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP # AL = convert lower nibble to hex @@ -30,15 +30,15 @@ print-byte: # f : (address buffered-file), n : int -> <void> 25/and-EAX 0xf/imm32 # . AL = to-hex-char(AL) e8/call to-hex-char/disp32 - # write-byte(f, AL) + # append-byte(f, AL) # . . push args 50/push-EAX ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8) # . . call - e8/call write-byte/disp32 + e8/call append-byte/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP -$print-byte:end: +$append-byte-hex:end: # . restore registers 58/pop-to-EAX # . epilog @@ -46,8 +46,79 @@ $print-byte:end: 5d/pop-to-EBP c3/return -test-print-byte: - # - check that print-byte prints the hex textual representation +test-append-byte-hex: + # - check that append-byte-hex adds the hex textual representation + # 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 + # append-byte-hex(_test-stream, 0xa) # exercises digit, non-digit as well as leading zero + # . . push args + 68/push 0xa/imm32 + 68/push _test-stream/imm32 + # . . call + e8/call append-byte-hex/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # check-stream-equal(_test-stream, "0a", msg) + # . . push args + 68/push "F - test-append-byte-hex"/imm32 + 68/push "0a"/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 + # . end + c3/return + +print-byte-buffered: # f : (address buffered-file), n : int -> <void> + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # . save registers + 50/push-EAX + # AL = convert upper nibble to hex + 8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 0/r32/EAX 0xc/disp8 . # copy *(EBP+12) to EAX + c1/shift 5/subop/logic-right 3/mod/direct 0/rm32/EAX . . . . . 4/imm8 # shift EAX right by 4 bits, while padding zeroes + 25/and-EAX 0xf/imm32 + # . AL = to-hex-char(AL) + e8/call to-hex-char/disp32 + # write-byte-buffered(f, AL) + # . . push args + 50/push-EAX + ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8) + # . . call + e8/call write-byte-buffered/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # AL = convert lower nibble to hex + 8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 0/r32/EAX 0xc/disp8 . # copy *(EBP+12) to EAX + 25/and-EAX 0xf/imm32 + # . AL = to-hex-char(AL) + e8/call to-hex-char/disp32 + # write-byte-buffered(f, AL) + # . . push args + 50/push-EAX + ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8) + # . . call + e8/call write-byte-buffered/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP +$print-byte-buffered:end: + # . restore registers + 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 + +test-print-byte-buffered: + # - check that print-byte-buffered prints the hex textual representation # setup # . clear-stream(_test-stream) # . . push args @@ -65,12 +136,12 @@ test-print-byte: e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP - # print-byte(_test-buffered-file, 0xa) # exercises digit, non-digit as well as leading zero + # print-byte-buffered(_test-buffered-file, 0xa) # exercises digit, non-digit as well as leading zero # . . push args 68/push 0xa/imm32 68/push _test-buffered-file/imm32 # . . call - e8/call print-byte/disp32 + e8/call print-byte-buffered/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP # flush(_test-buffered-file) @@ -82,7 +153,7 @@ test-print-byte: 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP # check-stream-equal(_test-stream, "0a", msg) # . . push args - 68/push "F - test-print-byte"/imm32 + 68/push "F - test-print-byte-buffered"/imm32 68/push "0a"/imm32 68/push _test-stream/imm32 # . . call |