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u3: adds comments to road pave implementations

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This commit is contained in:
Joe Bryan 2022-12-13 00:06:42 -05:00
parent ebf0ab49af
commit af8607fde4
1 changed files with 4 additions and 0 deletions
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4
pkg/urbit/noun/manage.c
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@ -522,6 +522,8 @@ _pave_north(c3_w* mem_w, c3_w siz_w, c3_w len_w)
// the stack starts at the end of the memory segment, // the stack starts at the end of the memory segment,
// minus space for the road structure [siz_w] // minus space for the road structure [siz_w]
// //
// NB: the returned road is "above" the stack
//
c3_w* rut_w = mem_w; c3_w* rut_w = mem_w;
c3_w* mat_w = ((mem_w + len_w) - siz_w); c3_w* mat_w = ((mem_w + len_w) - siz_w);
c3_w* cap_w = mat_w; c3_w* cap_w = mat_w;
@ -540,6 +542,8 @@ _pave_south(c3_w* mem_w, c3_w siz_w, c3_w len_w)
// the stack starts at the base memory pointer [mem_w], // the stack starts at the base memory pointer [mem_w],
// and ends after the space for the road structure [siz_w] // and ends after the space for the road structure [siz_w]
// //
// NB: the returned road is *on* the stack
//
c3_w* rut_w = (mem_w + len_w); c3_w* rut_w = (mem_w + len_w);
c3_w* mat_w = mem_w; c3_w* mat_w = mem_w;
c3_w* cap_w = mat_w + siz_w; c3_w* cap_w = mat_w + siz_w;