e1024b6030
Currently the heapBitsSweepSpan comment claims that heapBitsSweepSpan sets the heap bitmap for the first two words to dead. In fact, it sets the first *four* words to scalar/dead. This is important because first two words don't actually have a dead bit, so for objects larger than two words it *must* set a dead bit in third word to reset the object to a "noscan" state. For example, we use this in heapBits.hasPointers to detect that an object larger than two words is noscan. Change-Id: Ie166a628bed5060851db083475c7377adb349d6c Reviewed-on: https://go-review.googlesource.com/19630 Reviewed-by: Rick Hudson <rlh@golang.org> Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> |
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