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runtime: remove unused maxSliceCap function and maxElems array

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All uses of these have been converted to use runtime/internal/math
functions for overflow checking.

Fixes #21588

Change-Id: I0ba57028e471803dc7d445e66d77a8f87edfdafb
Reviewed-on: https://go-review.googlesource.com/c/144037
Run-TryBot: Martin Möhrmann <martisch@uos.de>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Martin Möhrmann 2018-10-23 10:03:59 +02:00 committed by Martin Möhrmann
parent 1e50dd02a9
commit 642792350c
2 changed files with 0 additions and 23 deletions
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1
src/cmd/compile/internal/gc/inl_test.go
View File

@ -54,7 +54,6 @@ func TestIntendedInlining(t *testing.T) {
"getm",
"isDirectIface",
"itabHashFunc",
"maxSliceCap",
"noescape",
"readUnaligned32",
"readUnaligned64",

22
src/runtime/slice.go
View File

@ -23,28 +23,6 @@ type notInHeapSlice struct {
cap int
}
// maxElems is a lookup table containing the maximum capacity for a slice.
// The index is the size of the slice element.
var maxElems = [...]uintptr{
^uintptr(0),
maxAlloc / 1, maxAlloc / 2, maxAlloc / 3, maxAlloc / 4,
maxAlloc / 5, maxAlloc / 6, maxAlloc / 7, maxAlloc / 8,
maxAlloc / 9, maxAlloc / 10, maxAlloc / 11, maxAlloc / 12,
maxAlloc / 13, maxAlloc / 14, maxAlloc / 15, maxAlloc / 16,
maxAlloc / 17, maxAlloc / 18, maxAlloc / 19, maxAlloc / 20,
maxAlloc / 21, maxAlloc / 22, maxAlloc / 23, maxAlloc / 24,
maxAlloc / 25, maxAlloc / 26, maxAlloc / 27, maxAlloc / 28,
maxAlloc / 29, maxAlloc / 30, maxAlloc / 31, maxAlloc / 32,
}
// maxSliceCap returns the maximum capacity for a slice.
func maxSliceCap(elemsize uintptr) uintptr {
if elemsize < uintptr(len(maxElems)) {
return maxElems[elemsize]
}
return maxAlloc / elemsize
}
func panicmakeslicelen() {
panic(errorString("makeslice: len out of range"))
}