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[dev.garbage] runtime: make _TinySizeClass an int8 to prevent use as spanClass

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Currently _TinySizeClass is untyped, which means it can accidentally
be used as a spanClass (not that I would know this from experience or
anything). Make it an int8 to avoid this mix up.

Change-Id: I1e69eccee436ea5aa45e9a9828a013e369e03f1a
Reviewed-on: https://go-review.googlesource.com/24372
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
This commit is contained in:
Austin Clements 2016-06-17 09:33:33 -04:00
parent edb54c300f
commit 81b74bf9c5
2 changed files with 2 additions and 2 deletions
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2
src/runtime/malloc.go
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@ -125,7 +125,7 @@ const (
// Tiny allocator parameters, see "Tiny allocator" comment in malloc.go.
_TinySize = 16
_TinySizeClass = 2
_TinySizeClass = int8(2)
_FixAllocChunk = 16 << 10 // Chunk size for FixAlloc
_MaxMHeapList = 1 << (20 - _PageShift) // Maximum page length for fixed-size list in MHeap.

2
src/runtime/mheap.go
View file

@ -262,7 +262,7 @@ type spanClass uint8
const (
numSpanClasses = _NumSizeClasses << 1
tinySpanClass = tinySizeClass<<1 | 1
tinySpanClass = spanClass(tinySizeClass<<1 | 1)
)
func makeSpanClass(sizeclass int8, noscan bool) spanClass {