Commit 295d160e authored by Austin Clements's avatar Austin Clements

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: default avatarRick Hudson <rlh@golang.org>
parent 8e25d4cc
......@@ -111,7 +111,7 @@ 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.
......
......@@ -326,7 +326,7 @@ type spanClass uint8
const (
numSpanClasses = _NumSizeClasses << 1
tinySpanClass = tinySizeClass<<1 | 1
tinySpanClass = spanClass(tinySizeClass<<1 | 1)
)
func makeSpanClass(sizeclass uint8, noscan bool) spanClass {
......
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