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| author | Kartik Agaram <vc@akkartik.com> | 2020-10-25 17:41:06 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2020-10-25 18:14:12 -0700 |
| commit | 8a6ad45d8d26c60b62a2a7ac8d594b3c4d1dbc45 (patch) | |
| tree | f021f4413da5f0b2e532fb7fd59f874355c366b1 /309stream.subx | |
| parent | 517ef9f64f32ea6592c7b802fd94391254daf86c (diff) | |
| download | mu-8a6ad45d8d26c60b62a2a7ac8d594b3c4d1dbc45.tar.gz | |
7100 - tile: render string literals
Diffstat (limited to '309stream.subx')
| -rw-r--r-- | 309stream.subx | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/309stream.subx b/309stream.subx index 84642def..adc92cfd 100644 --- a/309stream.subx +++ b/309stream.subx @@ -156,3 +156,59 @@ $read-from-stream:abort: bb/copy-to-ebx 1/imm32 (syscall_exit) # never gets here + +stream-first: # s: (addr stream byte) -> result/eax: byte + # . prologue + 55/push-ebp + 89/<- %ebp 4/r32/esp + # . save registers + 51/push-ecx + 56/push-esi + # result = false + b8/copy-to-eax 0/imm32 + # esi = s + 8b/-> *(ebp+8) 6/r32/esi + # var idx/ecx: int = s->read + 8b/-> *(esi+4) 1/r32/ecx + # if idx >= s->write return 0 + 3b/compare-with 1/r32/ecx *esi + 7d/jump-if->= $stream-first:end/disp8 + # result = s->data[idx] + 8a/byte-> *(esi+ecx+0xc) 0/r32/AL +$stream-first:end: + # . restore registers + 5e/pop-to-esi + 59/pop-to-ecx + # . epilogue + 89/<- %esp 5/r32/ebp + 5d/pop-to-ebp + c3/return + +stream-final: # s: (addr stream byte) -> result/eax: byte + # . prologue + 55/push-ebp + 89/<- %ebp 4/r32/esp + # . save registers + 51/push-ecx + 56/push-esi + # result = false + b8/copy-to-eax 0/imm32 + # esi = s + 8b/-> *(ebp+8) 6/r32/esi + # var max/ecx: int = s->write + 8b/-> *esi 1/r32/ecx + # if s->read >= max return 0 + 39/compare-with *(esi+4) 1/r32/ecx + 7d/jump-if->= $stream-final:end/disp8 + # var idx/ecx: int = max - 1 + 49/decrement-ecx + # result = s->data[idx] + 8a/byte-> *(esi+ecx+0xc) 0/r32/AL +$stream-final:end: + # . restore registers + 5e/pop-to-esi + 59/pop-to-ecx + # . epilogue + 89/<- %esp 5/r32/ebp + 5d/pop-to-ebp + c3/return |