diff options
author | Kartik Agaram <vc@akkartik.com> | 2019-02-03 23:31:03 -0800 |
---|---|---|
committer | Kartik Agaram <vc@akkartik.com> | 2019-02-03 23:33:48 -0800 |
commit | ddd2e9891e843279cf1c190c1ee7c5ceef9ef96b (patch) | |
tree | d6bba236bd6b28402436ce60e004decd0b951f78 /subx/058stream-equal.subx | |
parent | 51b4f888dd20653bb218f06e1221a7007446fcd5 (diff) | |
download | mu-ddd2e9891e843279cf1c190c1ee7c5ceef9ef96b.tar.gz |
4951
Cleaner way to compare streams in tests.
Diffstat (limited to 'subx/058stream-equal.subx')
-rw-r--r-- | subx/058stream-equal.subx | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/subx/058stream-equal.subx b/subx/058stream-equal.subx new file mode 100644 index 00000000..5a01d7ff --- /dev/null +++ b/subx/058stream-equal.subx @@ -0,0 +1,225 @@ +== 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 test-stream-data-equal/disp32 + 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 + +# compare all the data in a stream (ignoring the read pointer) +stream-data-equal?: # f : (address stream), s : (address string) -> EAX : boolean + # . 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 + # max/EDX = f->data + f->write + 8b/copy 0/mod/indirect 6/rm32/ESI . . . 0/r32/EAX . . # copy *ESI to EAX + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/ESI 0/index/EAX . 2/r32/EDX 0xc/disp8 . # copy ESI+EAX+12 to EDX + # currf/ESI = f->data + 81 0/subop/add 3/mod/direct 6/rm32/ESI . . . . . 0xc/imm32 # add to ESI + # EDI = s + 8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 7/r32/EDI 0xc/disp8 . # copy *(EBP+12) to EDI + # if (f->write != s->length) return false; + 39/compare 0/mod/indirect 7/rm32/EDI . . . 0/r32/EAX . . # compare *EDI and EAX + 75/jump-if-not-equal $stream-data-equal?:false/disp8 + # currs/EDI = s->data + 81 0/subop/add 3/mod/direct 7/rm32/EDI . . . . . 4/imm32 # add to EDI + # EAX = ECX = 0 + 31/xor 3/mod/direct 0/rm32/EAX . . . 0/r32/EAX . . # clear EAX + 31/xor 3/mod/direct 1/rm32/ECX . . . 1/r32/ECX . . # clear ECX +$stream-data-equal?:loop: + # if (curr >= max) return true + 39/compare 3/mod/direct 6/rm32/ESI . . . 2/r32/EDX . . # compare ESI with EDX + 7d/jump-if-greater-or-equal $stream-data-equal?:true/disp8 + # AL = *s + 8a/copy-byte 0/mod/indirect 6/rm32/ESI . . . 0/r32/AL . . # copy byte at *ESI to AL + # CL = *curr + 8a/copy-byte 0/mod/indirect 7/rm32/EDI . . . 1/r32/CL . . # copy byte at *EDI to CL + # if (EAX != ECX) return false + 39/compare 3/mod/direct 0/rm32/EAX . . . 1/r32/ECX . . # compare EAX and ECX + 75/jump-if-not-equal $stream-data-equal?:false/disp8 + # ++f + 46/increment-ESI + # ++curr + 47/increment-EDI + eb/jump $stream-data-equal?:loop/disp8 +$stream-data-equal?:false: + b8/copy-to-EAX 0/imm32 + eb/jump $stream-data-equal?:end/disp8 +$stream-data-equal?:true: + b8/copy-to-EAX 1/imm32 +$stream-data-equal?:end: + # . 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 + +test-stream-data-equal: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # 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 + # write(_test-stream, "Abc") + # . . push args + 68/push "Abc"/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 + # EAX = stream-data-equal?(_test-stream, "Abc") + # . . push args + 68/push "Abc"/imm32 + 68/push _test-stream/imm32 + # . . call + e8/call stream-data-equal?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # check-ints-equal(EAX, 1, msg) + # . . push args + 68/push "F - test-stream-data-equal"/imm32 + 68/push 1/imm32 + 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 + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +test-stream-data-equal-2: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # 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 + # write(_test-stream, "Abc") + # . . push args + 68/push "Abc"/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 + # EAX = stream-data-equal?(_test-stream, "Abd") + # . . push args + 68/push "Abd"/imm32 + 68/push _test-stream/imm32 + # . . call + e8/call stream-data-equal?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # check-ints-equal(EAX, 0, msg) + # . . push args + 68/push "F - test-stream-data-equal-2"/imm32 + 68/push 0/imm32 + 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 + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +test-stream-data-equal-length-check: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # 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 + # write(_test-stream, "Abc") + # . . push args + 68/push "Abc"/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 + # EAX = stream-data-equal?(_test-stream, "Abcd") + # . . push args + 68/push "Abcd"/imm32 + 68/push _test-stream/imm32 + # . . call + e8/call stream-data-equal?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # check-ints-equal(EAX, 0, msg) + # . . push args + 68/push "F - test-stream-data-equal-length-check"/imm32 + 68/push 0/imm32 + 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 + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +# helper for tests +check-stream-equal: # f : (address stream), s : (address string), msg : (address string) + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # . save registers + 50/push-EAX + # EAX = stream-data-equal?(f, s) + # . . push args + ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12) + ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8) + # . . call + e8/call stream-data-equal?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # check-ints-equal(EAX, 1, msg) + # . . push args + ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16) + 68/push 1/imm32 + 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 + # . 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 |