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runtime: make _TinySizeClass an int8 to prevent use as spanClass
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.
This is a cherry-pick of dev.garbage commit 81b74bf9c5
.
Change-Id: I1e69eccee436ea5aa45e9a9828a013e369e03f1a
Reviewed-on: https://go-review.googlesource.com/41254
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
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@ -111,7 +111,7 @@ const (
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// Tiny allocator parameters, see "Tiny allocator" comment in malloc.go.
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_TinySize = 16
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_TinySizeClass = 2
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_TinySizeClass = int8(2)
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_FixAllocChunk = 16 << 10 // Chunk size for FixAlloc
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_MaxMHeapList = 1 << (20 - _PageShift) // Maximum page length for fixed-size list in MHeap.
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@ -326,7 +326,7 @@ type spanClass uint8
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const (
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numSpanClasses = _NumSizeClasses << 1
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tinySpanClass = tinySizeClass<<1 | 1
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tinySpanClass = spanClass(tinySizeClass<<1 | 1)
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)
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func makeSpanClass(sizeclass uint8, noscan bool) spanClass {
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