diff options
| -rw-r--r-- | subx/056trace.subx | 346 |
1 files changed, 346 insertions, 0 deletions
diff --git a/subx/056trace.subx b/subx/056trace.subx index 2f2fd0ea..af52da2a 100644 --- a/subx/056trace.subx +++ b/subx/056trace.subx @@ -45,6 +45,13 @@ _test-trace-stream: # . 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 +#? Entry: # run a single test, while debugging +#? e8/call test-trace-single/disp32 +#? # 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 + # Allocate a new segment for the trace stream, initialize its length, and save its address to Trace-stream. # The Trace-stream segment will consist of variable-length lines separated by newlines (0x0a) initialize-trace-stream: # n : int -> <void> @@ -238,6 +245,345 @@ test-trace-empty-line: # end c3/return +check-trace-contains: # line : (address string), msg : (address string) + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # rewind-stream(*Trace-stream) + # . . push args + ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Segment-size + # . . call + e8/call rewind-stream/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # check-trace-can-scan-to(line, msg) + # . . 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 check-trace-can-scan-to/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP +$check-trace-contains:end: + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +check-trace-scans-to: # line : (address string), msg : (address string) + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # . save registers + 50/push-EAX + # EAX = trace-scan(*Trace-stream, line) + # . . push args + ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8) + ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Segment-size + # . . call + e8/call check-trace-can-scan-to/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # check-ints-equal(EAX, 1, msg) + # . . push args + ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12) + 68/push 1/imm32 + 50/push-EAX + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP +$check-trace-scans-to: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 + +# Start scanning from Trace-stream->read for 'line'. If found, update Trace-stream->read and return true. +trace-scan: # line : string -> result/EAX : boolean + # pseudocode: + # while true: + # if Trace-stream->read >= Trace-stream->write + # break + # if next-line-matches?(Trace-stream, line) + # skip-next-line(Trace-stream) + # return true + # return false + # + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # . save registers + 51/push-ECX + 56/push-ESI + # ESI = *Trace-stream + 8b/copy 0/mod/indirect 5/rm32/.disp32 . . 6/r32/ESI Trace-stream/disp32 # copy *Trace-stream to ESI + # ECX = Trace-stream->write +$trace-scan:loop: + # if (Trace-stream->read >= Trace-stream->write) return false + 39/compare 1/mod/*+disp8 6/rm32/ESI . . . 1/r32/ECX 4/disp8 . # compare ECX with *(ESI+4) + 7d/jump-if-greater-or-equal $trace-scan:false/disp8 + # EAX = next-line-matches?(Trace-stream, line) + # . . push args + ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8) + 56/push-ESI + # . . call + e8/call next-line-matches?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # if (EAX == 0) continue + 3d/compare-EAX-and 0/imm32 + 74/jump-if-equal $trace-scan:loop/disp8 +$trace-scan:true: + # skip-next-line(Trace-stream) + # . . push args + 56/push-ESI + # . . call + e8/call skip-next-line/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # return true + b8/copy-to-EAX 1/imm32/true + eb/jump $trace-scan:end/disp8 +$trace-scan:false: + b8/copy-to-EAX 0/imm32/false +$trace-scan:end: + # . restore registers + 59/pop-to-ECX + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +next-line-matches?: # t : (address stream), line : string -> result/EAX : boolean + # pseudocode: + # while true: + # if (currl >= maxl) break + # if (currt >= maxt) return false + # if (*currt != *currl) return false + # ++currt + # ++currl + # return *currt == '\n' + # + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # . save registers + # ESI = line + # maxl/ECX = line->data + line->size + # currl/ESI = line->data + # EDI = t + # maxt/EDX = t->data + t->write + # currt/EDI = t->data + t->read +$next-line-matches?:loop: + # if (currl >= maxl) break + # if (currt >= maxt) return false + # if (*currt != *currl) return false + # ++currt + # ++currl +$next-line-matches?:break: + # return *currt == '\n' +$next-line-matches?:end: + # . restore registers + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +skip-next-line: # t : (address stream) + # pseudocode: + # i = t->read + # curr = t->data + t->read + # max = t->data + t->write + # while true + # if (curr >= max) break + # if (*curr == '\n') break + # ++curr + # ++i + # t->read = i + # + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # . save registers + # i = t->read + # curr = t->data + t->read + # max = t->data + t->write +$skip-next-line:loop: + # if (curr >= max) break + # if (*curr == '\n') break + # ++curr + # ++i +$skip-next-line:end: + # t->read = i + # . restore registers + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +test-trace-scan-first: + # setup + # . *Trace-stream = _test-trace-stream + b8/copy-to-EAX _test-trace-stream/imm32 + 89/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX Trace-stream/disp32 # copy EAX to *Trace-stream + # . clear-trace-stream() + e8/call clear-trace-stream/disp32 + # . trace("Ab") + # . . push args + 68/push "Ab"/imm32 + # . . call + e8/call trace/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # EAX = trace-scan("Ab") + # . . push args + 68/push "Ab"/imm32 + # . . call + e8/call trace-scan/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # check-ints-equal(EAX, 1, msg) + # . . push args + 68/push "F - test-trace-scan-first"/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 + # . end + c3/return + +test-trace-scan-skips-lines-until-found: + # setup + # . *Trace-stream = _test-trace-stream + b8/copy-to-EAX _test-trace-stream/imm32 + 89/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX Trace-stream/disp32 # copy EAX to *Trace-stream + # . clear-trace-stream() + e8/call clear-trace-stream/disp32 + # . trace("Ab") + # . . push args + 68/push "Ab"/imm32 + # . . call + e8/call trace/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # . trace("cd") + # . . push args + 68/push "cd"/imm32 + # . . call + e8/call trace/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # EAX = trace-scan("cd") + # . . push args + 68/push "cd"/imm32 + # . . call + e8/call trace-scan/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # check-ints-equal(EAX, 1, msg) + # . . push args + 68/push "F - test-trace-scan-skips-lines-until-found"/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 + # . end + c3/return + +test-trace-second-scan-starts-where-first-left-off: + # setup + # . *Trace-stream = _test-trace-stream + b8/copy-to-EAX _test-trace-stream/imm32 + 89/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX Trace-stream/disp32 # copy EAX to *Trace-stream + # . clear-trace-stream() + e8/call clear-trace-stream/disp32 + # . trace("Ab") + # . . push args + 68/push "Ab"/imm32 + # . . call + e8/call trace/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # . EAX = trace-scan("Ab") + # . . push args + 68/push "Ab"/imm32 + # . . call + e8/call trace-scan/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # second scan fails + # . EAX = trace-scan("Ab") + # . . push args + 68/push "Ab"/imm32 + # . . call + e8/call trace-scan/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # check-ints-equal(EAX, 0, msg) + # . . push args + 68/push "F - test-trace-second-scan-starts-where-first-left-off"/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 + # . end + c3/return + +test-trace-scan-failure-leaves-read-index-untouched: + # setup + # . *Trace-stream = _test-trace-stream + b8/copy-to-EAX _test-trace-stream/imm32 + 89/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX Trace-stream/disp32 # copy EAX to *Trace-stream + # . clear-trace-stream() + e8/call clear-trace-stream/disp32 + # . trace("Ab") + # . . push args + 68/push "Ab"/imm32 + # . . call + e8/call trace/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # . check-ints-equal(_test-trace-stream->read, 0, msg) + # . . push args + 68/push "F - test-trace-second-scan-starts-where-first-left-off/precondition-failure"/imm32 + 68/push 0/imm32 + b8/copy-to-EAX _test-trace-stream/imm32 + ff 6/subop/push 1/mod/*+disp8 0/rm32/EAX . . . . 4/disp8 . # push *(EAX+4) + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # perform a failing scan + # . EAX = trace-scan("Ax") + # . . push args + 68/push "Ax"/imm32 + # . . call + e8/call trace-scan/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # no change in read index + # . check-ints-equal(_test-trace-stream->read, 0, msg) + # . . push args + 68/push "F - test-trace-second-scan-starts-where-first-left-off"/imm32 + 68/push 0/imm32 + b8/copy-to-EAX _test-trace-stream/imm32 + ff 6/subop/push 1/mod/*+disp8 0/rm32/EAX . . . . 4/disp8 . # push *(EAX+4) + # . . 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 + clear-trace-stream: # . prolog 55/push-EBP |