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| author | Kartik Agaram <vc@akkartik.com> | 2019-07-07 23:56:23 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2019-07-07 23:56:23 -0700 |
| commit | 195d62f167d51b43ef7dc564899427ee63328c97 (patch) | |
| tree | e7c1ae0c83f9a15de58231d9b79745d88db534ad /subx/apps/subx-common.subx | |
| parent | 23bc3650e0d4d7ccc8a8976cb085d202c7d1bc39 (diff) | |
| download | mu-195d62f167d51b43ef7dc564899427ee63328c97.tar.gz | |
build `num-bytes`
Diffstat (limited to 'subx/apps/subx-common.subx')
| -rw-r--r-- | subx/apps/subx-common.subx | 64 |
1 files changed, 62 insertions, 2 deletions
diff --git a/subx/apps/subx-common.subx b/subx/apps/subx-common.subx index d9f4e34c..ef1a6f93 100644 --- a/subx/apps/subx-common.subx +++ b/subx/apps/subx-common.subx @@ -1136,7 +1136,7 @@ test-has-metadata-multiple-false: 5d/pop-to-EBP c3/return -compute-width: # word : (address array byte) +compute-width: # word : (address array byte) -> EAX : int # . prolog 55/push-EBP 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP @@ -1198,7 +1198,7 @@ compute-width: # word : (address array byte) # else: return 1 b8/copy-to-EAX 1/imm32 $compute-width:end: - # . discard locals + # . reclaim locals 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP # . restore registers 59/pop-to-ECX @@ -1322,6 +1322,66 @@ $test-compute-width:no-metadata: 5d/pop-to-EBP c3/return +compute-width-of-slice: # s : (address slice) -> EAX : int + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # . save registers + 51/push-ECX + # ECX = s + 8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 1/r32/ECX 8/disp8 . # copy *(EBP+8) to ECX + # if has-metadata?(word, "imm32") or has-metadata?(word, "disp32"): return 4 + # . EAX = has-metadata?(word, "imm32") + 68/push "imm32"/imm32 + 51/push-ECX + e8/call has-metadata?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # . if EAX: return 4 + 3d/compare-EAX-and 1/imm32 + b8/copy-to-EAX 4/imm32 # ZF is set, so we can overwrite EAX now + 74/jump-if-equal $compute-width-of-slice:end/disp8 + # . has-metadata?(word, "disp32") + 68/push "disp32"/imm32 + 51/push-ECX + e8/call has-metadata?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # . if EAX: return 4 + 3d/compare-EAX-and 1/imm32 + b8/copy-to-EAX 4/imm32 # ZF is set, so we can overwrite EAX now + 74/jump-if-equal $compute-width-of-slice:end/disp8 + # if has-metadata?(word, "imm16") or has-metadata?(word, "disp16"): return 2 + # . has-metadata?(word, "imm16") + 68/push "imm16"/imm32 + 51/push-ECX + e8/call has-metadata?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # . if EAX: return 2 + 3d/compare-EAX-and 1/imm32 + b8/copy-to-EAX 2/imm32 # ZF is set, so we can overwrite EAX now + 74/jump-if-equal $compute-width-of-slice:end/disp8 + # . has-metadata?(word, "disp16") + 68/push "disp16"/imm32 + 51/push-ECX + e8/call has-metadata?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # . if EAX: return 2 + 3d/compare-EAX-and 1/imm32 + b8/copy-to-EAX 2/imm32 # ZF is set, so we can overwrite EAX now + 74/jump-if-equal $compute-width-of-slice:end/disp8 + # else: return 1 + b8/copy-to-EAX 1/imm32 +$compute-width-of-slice: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 + is-label?: # word : (address slice) -> EAX : boolean # . prolog 55/push-EBP |