diff options
Diffstat (limited to 'subx/apps/factorial.subx')
| -rw-r--r-- | subx/apps/factorial.subx | 204 |
1 files changed, 184 insertions, 20 deletions
diff --git a/subx/apps/factorial.subx b/subx/apps/factorial.subx index 88f4baa8..209206ca 100644 --- a/subx/apps/factorial.subx +++ b/subx/apps/factorial.subx @@ -7,11 +7,12 @@ # $ echo $? # 120 # -# You can also run an automated test (that does the exact same thing): +# You can also run the automated test suite: # $ subx run apps/factorial test # Expected output: -# . +# ........ # Every '.' indicates a passing test. Failing tests get a 'F'. +# When running tests the exit status doesn't mean anything. Yet. == code # instruction effective address operand displacement immediate @@ -26,8 +27,8 @@ # and if (argv[1] == "test") 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 0/r32/EAX 8/disp8 . # copy *(ESP+8) to EAX # push args - 68/push Test_argv/imm32 50/push-EAX + 68/push "test"/imm32 # call e8/call argv_equal/disp32 # discard args @@ -141,33 +142,59 @@ $check_ints_equal:else: # end c3/return -# compare two null-terminated ascii strings +# compare a null-terminated ascii string with a more idiomatic length-prefixed byte array # reason for the name: the only place we should have null-terminated ascii strings is from commandline args -argv_equal: # (s1, s2) : null-terminated ascii strings -> EAX : boolean - # initialize s1 (ECX) and s2 (EDX) - 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 1/r32/ECX 8/disp8 . # copy *(ESP+8) to ECX +argv_equal: # s : null-terminated ascii string, benchmark : length-prefixed ascii string -> EAX : boolean + # pseudocode: + # initialize n = b.length + # initialize s1 = s + # initialize s2 = b.data + # i = 0 + # for (i = 0; i < n; ++n) + # c1 = *s1 + # c2 = *s2 + # if c1 == 0 + # return false + # if c1 != c2 + # return false + # return *s1 == 0 +# {{{ + # initialize s into EDI + 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 7/r32/EDI 8/disp8 . # copy *(ESP+8) to EDI + # initialize benchmark length n into EDX 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 2/r32/EDX 4/disp8 . # copy *(ESP+4) to EDX - # while (true) + 8b/copy 0/mod/indirect 2/rm32/EDX . . . 2/r32/EDX . . # copy *EDX to EDX + # initialize benchmark data into ESI + 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 6/r32/ESI 4/disp8 . # copy *(ESP+4) to ESI + 81 0/subop/add 3/mod/direct 6/rm32/ESI . . . . . 4/imm32 # add 4 to ESI + # initialize loop counter i into ECX + b9/copy . . . . . . . 0/imm32/exit # copy 1 to ECX + # while (i/ECX < n/EDX) $argv_loop: - # c1/EAX, c2/EBX = *s1, *s2 + 39/compare 3/mod/direct 1/rm32/ECX . . . 2/r32/EDX . . # compare ECX with EDX + 74/jump-if-equal $argv_break/disp8 + # c1/EAX, c2/EBX = *s, *benchmark b8/copy 0/imm32 # clear EAX - 8a/copy 0/mod/indirect 1/rm32/ECX . . . 0/r32/EAX . . # copy byte at *ECX to lower byte of EAX + 8a/copy 0/mod/indirect 7/rm32/EDI . . . 0/r32/EAX . . # copy byte at *EDI to lower byte of EAX bb/copy 0/imm32 # clear EBX - 8a/copy 0/mod/indirect 2/rm32/EDX . . . 3/r32/EBX . . # copy byte at *EDX to lower byte of EBX - # if (c1 == 0) break + 8a/copy 0/mod/indirect 6/rm32/ESI . . . 3/r32/EBX . . # copy byte at *ESI to lower byte of EBX + # if (c1 == 0) return false 3d/compare . . . . . . . 0/imm32 # compare EAX with 0 - 74/jump-if-equal $argv_break/disp8 + 74/jump-if-equal $argv_fail/disp8 # if (c1 != c2) return false 39/compare 3/mod/direct 0/rm32/EAX . . . 3/r32/EBX . . # compare EAX with EBX 75/jump-if-not-equal $argv_fail/disp8 - # ++s1, ++s2 + # ++s1, ++s2, ++i 41/inc-ECX - 42/inc-EDX + 46/inc-ESI + 47/inc-EDI # end while eb/jump $argv_loop/disp8 $argv_break: - # if (c2 == 0) return true - 81 7/subop/compare 3/mod/direct 3/rm32/EBX . . . . . 0/imm32 # compare EBX with 0 + # if (*s/EDI == 0) return true + b8/copy 0/imm32 # clear EAX + 8a/copy 0/mod/indirect 7/rm32/EDI . . . 0/r32/EAX . . # copy byte at *EDI to lower byte of EAX + 81 7/subop/compare 3/mod/direct 0/rm32/EAX . . . . . 0/imm32 # compare EAX with 0 75/jump-if-not-equal $argv_fail/disp8 b8/copy . . . . . . . 1/imm32 # copy 1 to EAX c3/return @@ -175,6 +202,141 @@ $argv_break: $argv_fail: b8/copy . . . . . . . 0/imm32 # copy 0 to EAX c3/return +# }}} +# tests for argv_equal {{{ +test_compare_null_argv_with_empty_array: + # EAX = argv_equal(Null_argv, "") + # push args + 68/push Null_argv/imm32 + 68/push ""/imm32 + # call + e8/call argv_equal/disp32 + # discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add 8 to ESP + # call check_ints_equal(EAX, 1) + 50/push-EAX + 68/push 1/imm32/true + 68/push "F - test_compare_null_argv_with_empty_array"/imm32 + # call + e8/call check_ints_equal/disp32 + # discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add 12 to ESP + c3/return + +test_compare_null_argv_with_non_empty_array: + # EAX = argv_equal(Null_argv, "Abc") + # push args + 68/push Null_argv/imm32 + 68/push "Abc"/imm32 + # call + e8/call argv_equal/disp32 + # discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add 8 to ESP + # call check_ints_equal(EAX, 0) + 50/push-EAX + 68/push 0/imm32/false + 68/push "F - test_compare_null_argv_with_non_empty_array"/imm32 + # call + e8/call check_ints_equal/disp32 + # discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add 12 to ESP + c3/return + +test_compare_argv_with_equal_array: + # EAX = argv_equal(Abc_argv, "Abc") + # push args + 68/push Abc_argv/imm32 + 68/push "Abc"/imm32 + # call + e8/call argv_equal/disp32 + # discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add 8 to ESP + # call check_ints_equal(EAX, 1) + 50/push-EAX + 68/push 1/imm32/true + 68/push "F - test_compare_argv_with_equal_array"/imm32 + # call + e8/call check_ints_equal/disp32 + # discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add 12 to ESP + c3/return + +test_compare_argv_with_inequal_array: + # EAX = argv_equal(Abc_argv, "Adc") + # push args + 68/push Abc_argv/imm32 + 68/push "Adc"/imm32 + # call + e8/call argv_equal/disp32 + # discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add 8 to ESP + # call check_ints_equal(EAX, 0) + 50/push-EAX + 68/push 0/imm32/false + 68/push "F - test_compare_argv_with_equal_array"/imm32 + # call + e8/call check_ints_equal/disp32 + # discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add 12 to ESP + c3/return + +test_compare_argv_with_empty_array: + # EAX = argv_equal(Abc_argv, "") + # push args + 68/push Abc_argv/imm32 + 68/push ""/imm32 + # call + e8/call argv_equal/disp32 + # discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add 8 to ESP + # call check_ints_equal(EAX, 0) + 50/push-EAX + 68/push 0/imm32/false + 68/push "F - test_compare_argv_with_equal_array"/imm32 + # call + e8/call check_ints_equal/disp32 + # discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add 12 to ESP + c3/return + +test_compare_argv_with_shorter_array: + # EAX = argv_equal(Abc_argv, "Ab") + # push args + 68/push Abc_argv/imm32 + 68/push "Ab"/imm32 + # call + e8/call argv_equal/disp32 + # discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add 8 to ESP + # call check_ints_equal(EAX, 0) + 50/push-EAX + 68/push 0/imm32/false + 68/push "F - test_compare_argv_with_shorter_array"/imm32 + # call + e8/call check_ints_equal/disp32 + # discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add 12 to ESP + c3/return + +test_compare_argv_with_longer_array: + # EAX = argv_equal(Abc_argv, "Abcd") + # push args + 68/push Abc_argv/imm32 + 68/push "Abcd"/imm32 + # call + e8/call argv_equal/disp32 + # discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add 8 to ESP + # call check_ints_equal(EAX, 0) + 50/push-EAX + 68/push 0/imm32/false + 68/push "F - test_compare_argv_with_longer_array"/imm32 + # call + e8/call check_ints_equal/disp32 + # discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add 12 to ESP + c3/return +# }}} write_stderr: # s : (address array byte) -> <void> # save registers @@ -209,8 +371,10 @@ Newline: # data 0a/newline -Test_argv: # null-terminated - # data - 74/t 65/e 73/s 74/t 00/null +# for argv_equal tests +Null_argv: + 00/null +Abc_argv: + 41/A 62/b 63/c 00/null # vim:ft=subx:nowrap:so=0 |