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| author | Kartik Agaram <vc@akkartik.com> | 2020-04-03 12:35:53 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2020-04-03 12:35:53 -0700 |
| commit | bfcc0f858aa324739ad645e2056d73a47ab66f82 (patch) | |
| tree | 24a22e364b2c1d535013c604b7a9620a31606e71 /055stream.subx | |
| parent | f730f2f2c7934f52091a848b71f9031ea99e2377 (diff) | |
| download | mu-bfcc0f858aa324739ad645e2056d73a47ab66f82.tar.gz | |
6182 - start of support for safe handles
So far it's unclear how to do this in a series of small commits. Still nibbling around the edges. In this commit we standardize some terminology: The length of an array or stream is denominated in the high-level elements. The _size_ is denominated in bytes. The thing we encode into the type is always the size, not the length. There's still an open question of what to do about the Mu `length` operator. I'd like to modify it to provide the length. Currently it provides the size. If I can't fix that I'll rename it.
Diffstat (limited to '055stream.subx')
| -rw-r--r-- | 055stream.subx | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/055stream.subx b/055stream.subx index 15d82ce6..84d0580b 100644 --- a/055stream.subx +++ b/055stream.subx @@ -3,10 +3,10 @@ # A stream looks like this: # write: int # index at which writes go # read: int # index that we've read until -# data: (array byte) # prefixed by length as usual +# data: (array byte) # prefixed by size as usual # # some primitives for operating on streams: -# - clear-stream (clears everything but the data length) +# - clear-stream (clears everything but the data size) # - rewind-stream (resets read pointer) == code @@ -23,9 +23,9 @@ clear-stream: # f: (addr stream byte) 51/push-ecx # eax = f 8b/copy 1/mod/*+disp8 5/rm32/ebp . . 0/r32/eax 8/disp8 . # copy *(ebp+8) to eax - # var count/ecx: int = f->length + # var count/ecx: int = f->size 8b/copy 1/mod/*+disp8 0/rm32/eax . . . 1/r32/ecx 8/disp8 . # copy *(eax+8) to ecx - # var max/ecx: (addr byte) = &f->data[f->length] + # var max/ecx: (addr byte) = &f->data[f->size] 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/eax 1/index/ecx . 1/r32/ecx 0xc/disp8 . # copy eax+ecx+12 to ecx # f->write = 0 c7 0/subop/copy 0/mod/direct 0/rm32/eax . . . . . 0/imm32 # copy to *eax |