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runtime: improve initSpan documentation

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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>
This commit is contained in:
Austin Clements 2016-02-09 17:34:14 -05:00
parent e1024b6030
commit 39f2bd737b
1 changed files with 4 additions and 0 deletions
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4
src/runtime/mbitmap.go
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@ -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")