diff options
| author | Austin Clements <austin@google.com> | 2016-02-09 17:34:14 -0500 |
|---|---|---|
| committer | Austin Clements <austin@google.com> | 2016-02-25 23:37:14 +0000 |
| commit | 39f2bd737bb0b9446b4d241aa76fcb87d7e77278 (patch) | |
| tree | 9c6b33cfc760adb55b47f644a20c64a029c55c8b /src/runtime/mbitmap.go | |
| parent | e1024b6030e181f3994d93cac6099d3d0f341260 (diff) | |
| download | go-39f2bd737bb0b9446b4d241aa76fcb87d7e77278.tar.xz | |
runtime: improve initSpan documentation
Change-Id: I9c45aad1c35a99da4c3b8990649dcd962fd23b81
Reviewed-on: https://go-review.googlesource.com/19631
Reviewed-by: Rick Hudson <rlh@golang.org>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Diffstat (limited to 'src/runtime/mbitmap.go')
| -rw-r--r-- | src/runtime/mbitmap.go | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/runtime/mbitmap.go b/src/runtime/mbitmap.go index 35fc82bf4a..04992890a1 100644 --- a/src/runtime/mbitmap.go +++ b/src/runtime/mbitmap.go @@ -494,6 +494,10 @@ func typeBitsBulkBarrier(typ *_type, p, size uintptr) { // TODO(rsc): Perhaps introduce a different heapBitsSpan type. // initSpan initializes the heap bitmap for a span. +// It clears all mark and checkmark bits. +// If this is a span of pointer-sized objects, it initializes all +// words to pointer (and there are no dead bits). +// Otherwise, it initializes all words to scalar/dead. func (h heapBits) initSpan(size, n, total uintptr) { if total%heapBitmapScale != 0 { throw("initSpan: unaligned length") |