diff options
author | Kartik Agaram <vc@akkartik.com> | 2019-07-12 11:23:23 -0700 |
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committer | Kartik Agaram <vc@akkartik.com> | 2019-07-12 11:23:23 -0700 |
commit | 38a314d320c78dbb080a012d96207631bce78169 (patch) | |
tree | bf6bda7a8cd2fd8b259fdebc4dd66e653be91452 /subx/apps | |
parent | 0be794d4400c978649bef61b1c578008a7a7936c (diff) | |
download | mu-38a314d320c78dbb080a012d96207631bce78169.tar.gz |
rearrange compute-offsets cases
Now they're in the order you expect to see them at runtime: first you see a segment header, then you see labels.
Diffstat (limited to 'subx/apps')
-rw-r--r-- | subx/apps/survey.subx | 147 |
1 files changed, 74 insertions, 73 deletions
diff --git a/subx/apps/survey.subx b/subx/apps/survey.subx index 9fe896a7..9a1b1df1 100644 --- a/subx/apps/survey.subx +++ b/subx/apps/survey.subx @@ -346,17 +346,9 @@ compute-offsets: # in : (address buffered-file), segments : (address stream {st # word-slice = next-word(line) # if slice-empty?(word-slice) # end of line # break - # if slice-starts-with?(word-slice, "#") # comment - # continue - # if is-label?(word-slice) - # strip trailing ':' from word-slice - # x : (address label-info) = get-or-insert(labels, name) - # x->segment-offset = segment-offset - # trace("label '", word-slice, "' is in segment '", curr-segment-name, "'.") - # trace("label '", word-slice, "' is at segment offset ", segment-offset, ".") - # # labels occupy no space, so no need to increment offsets + # else if slice-starts-with?(word-slice, "#") # comment # continue - # if slice-equal?(word-slice, "==") + # else if slice-equal?(word-slice, "==") # if curr-segment-name != 0 # seg = get-or-insert(segments, curr-segment-name) # seg->size = *file-offset - seg->file-offset @@ -373,6 +365,14 @@ compute-offsets: # in : (address buffered-file), segments : (address stream {st # seg->file-offset = *file-offset # trace("segment '", curr-segment-name, "' is at file offset ", seg->file-offset) # segment-offset = 0 + # break (next line) + # else if is-label?(word-slice) + # strip trailing ':' from word-slice + # x : (address label-info) = get-or-insert(labels, name) + # x->segment-offset = segment-offset + # trace("label '", word-slice, "' is in segment '", curr-segment-name, "'.") + # trace("label '", word-slice, "' is at segment offset ", segment-offset, ".") + # # labels occupy no space, so no need to increment offsets # else # width = compute-width-of-slice(word-slice) # *segment-offset += width @@ -421,7 +421,7 @@ $compute-offsets:line-loop: # if (line->write == 0) break 8b/copy 0/mod/indirect 1/rm32/ECX . . . 0/r32/EAX . . # copy *ECX to EAX 3d/compare-EAX-and 0/imm32 - 0f 84/jump-if-equal $compute-offsets:break/disp32 + 0f 84/jump-if-equal $compute-offsets:break-line-loop/disp32 $compute-offsets:word-loop: # EDX = word-slice ba/copy-to-EDX compute-offsets:word-slice/imm32 @@ -530,73 +530,17 @@ $compute-offsets:check0: # . if (EAX != 0) continue 3d/compare-EAX-and 0/imm32 0f 85/jump-if-not-equal $compute-offsets:word-loop/disp32 -$compute-offsets:label: - # if (!is-label?(word-slice/EDX)) goto next check - # . EAX = is-label?(word-slice/EDX) - # . . push args - 52/push-EDX - # . . call - e8/call is-label?/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP - # . if (EAX == 0) goto next check - 3d/compare-EAX-and 0/imm32 - 74/jump-if-equal $compute-offsets:segment/disp8 - # strip trailing ':' from word-slice - ff 1/subop/decrement 1/mod/*+disp8 2/rm32/EDX . . . . 4/disp8 . # decrement *(EDX+4) - # x/EAX = get-or-insert-slice(labels, word-slice, row-size=16) - # . . push args - 68/push 0x10/imm32/row-size - 52/push-EDX - ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16) - # . . call - e8/call get-or-insert-slice/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP - # x->segment-offset = segment-offset - # . EBX = segment-offset - 8f 0/subop/pop 0/mod/indirect 5/rm32/.disp32 . . . compute-offsets:segment-offset/disp32 - # . x->segment-offset = EBX - 89/copy 1/mod/*+disp8 0/rm32/EAX . . . 3/r32/EBX 4/disp8 . # copy EBX to *(EAX+4) - # trace-slsss("label '" word-slice/EDX "' is in segment '" current-segment-name "'.") - # . . push args - 68/push "'."/imm32 - 56/push-ESI - 68/push "' is in segment '"/imm32 - 52/push-EDX - 68/push "label '"/imm32 - # . . call - e8/call trace-slsss/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP - # trace-slsns("label '" word-slice/EDX "' is at segment offset " *segment-offset/EAX ".") - # . . EAX = file-offset - b8/copy-to-EAX compute-offsets:segment-offset/imm32 - # . . EAX = *file-offset/EAX - 8b/copy 0/mod/indirect 0/rm32/EAX . . . 0/r32/EAX . . # copy *EAX to EAX - # . . push args - 68/push "."/imm32 - 50/push-EAX - 68/push "' is at segment offset "/imm32 - 52/push-EDX - 68/push "label '"/imm32 - # . . call - e8/call trace-slsns/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP - # continue - e9/jump $compute-offsets:word-loop/disp32 -$compute-offsets:segment: - # if (!slice-equal?(word-slice/EDX, "==")) goto next check +$compute-offsets:case-segment-header: + # if (!slice-equal?(word-slice/EDX, "==")) goto next case # . EAX = slice-equal?(word-slice/EDX, "==") 68/push "=="/imm32 52/push-EDX e8/call slice-equal?/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP - # . if (EAX == 0) goto next check + # . if (EAX == 0) goto next case 3d/compare-EAX-and 0/imm32 - 0f 84/jump-if-equal $compute-offsets:else/disp32 + 0f 84/jump-if-equal $compute-offsets:case-label/disp32 # if (curr-segment-name == 0) goto construct-next-segment 81 7/subop/compare 3/mod/direct 6/rm32/ESI . . . . . 0/imm32 # compare ESI 74/jump-if-equal $compute-offsets:construct-next-segment/disp8 @@ -753,8 +697,65 @@ $compute-offsets:update-curr-segment-name: 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP # segment-offset = 0 c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 . . . compute-offsets:segment-offset/disp32 0/imm32 # copy to *segment-offset + # break e9/jump $compute-offsets:line-loop/disp32 -$compute-offsets:else: +$compute-offsets:case-label: + # if (!is-label?(word-slice/EDX)) goto next case + # . EAX = is-label?(word-slice/EDX) + # . . push args + 52/push-EDX + # . . call + e8/call is-label?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # . if (EAX == 0) goto next case + 3d/compare-EAX-and 0/imm32 + 74/jump-if-equal $compute-offsets:case-final/disp8 + # strip trailing ':' from word-slice + ff 1/subop/decrement 1/mod/*+disp8 2/rm32/EDX . . . . 4/disp8 . # decrement *(EDX+4) + # x/EAX = get-or-insert-slice(labels, word-slice, row-size=16) + # . . push args + 68/push 0x10/imm32/row-size + 52/push-EDX + ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16) + # . . call + e8/call get-or-insert-slice/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # x->segment-offset = segment-offset + # . EBX = segment-offset + 8f 0/subop/pop 0/mod/indirect 5/rm32/.disp32 . . . compute-offsets:segment-offset/disp32 + # . x->segment-offset = EBX + 89/copy 1/mod/*+disp8 0/rm32/EAX . . . 3/r32/EBX 4/disp8 . # copy EBX to *(EAX+4) + # trace-slsss("label '" word-slice/EDX "' is in segment '" current-segment-name "'.") + # . . push args + 68/push "'."/imm32 + 56/push-ESI + 68/push "' is in segment '"/imm32 + 52/push-EDX + 68/push "label '"/imm32 + # . . call + e8/call trace-slsss/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP + # trace-slsns("label '" word-slice/EDX "' is at segment offset " *segment-offset/EAX ".") + # . . EAX = file-offset + b8/copy-to-EAX compute-offsets:segment-offset/imm32 + # . . EAX = *file-offset/EAX + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 0/r32/EAX . . # copy *EAX to EAX + # . . push args + 68/push "."/imm32 + 50/push-EAX + 68/push "' is at segment offset "/imm32 + 52/push-EDX + 68/push "label '"/imm32 + # . . call + e8/call trace-slsns/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP + # continue + e9/jump $compute-offsets:word-loop/disp32 +$compute-offsets:case-final: # width/EAX = compute-width-of-slice(word-slice) # . . push args 52/push-EDX @@ -767,7 +768,7 @@ $compute-offsets:else: # file-offset += width 01/add 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX compute-offsets:file-offset/disp32 # add EAX to *file-offset e9/jump $compute-offsets:word-loop/disp32 -$compute-offsets:break: +$compute-offsets:break-line-loop: # seg/EAX = get-or-insert(segments, curr-segment-name, row-size=16) # . . push args 68/push 0x10/imm32/row-size |