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runtime: simplify mallocgc flag argument

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mallocgc can calculate noscan itself.  The only remaining
flag argument is needzero, so we just make that a boolean arg.

Fixes #15379

Change-Id: I839a70790b2a0c9dbcee2600052bfbd6c8148e20
Reviewed-on: https://go-review.googlesource.com/22290
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Keith Randall 2016-04-19 19:35:10 -07:00
parent 731531980a
commit 001e8e8070
8 changed files with 23 additions and 54 deletions
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6
src/runtime/string.go
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@ -284,7 +284,7 @@ func stringiter2(s string, k int) (int, rune) {
// The storage is not zeroed. Callers should use
// b to set the string contents and then drop b.
func rawstring(size int) (s string, b []byte) {
p := mallocgc(uintptr(size), nil, flagNoScan|flagNoZero)
p := mallocgc(uintptr(size), nil, false)
stringStructOf(&s).str = p
stringStructOf(&s).len = size
@ -302,7 +302,7 @@ func rawstring(size int) (s string, b []byte) {
// rawbyteslice allocates a new byte slice. The byte slice is not zeroed.
func rawbyteslice(size int) (b []byte) {
cap := roundupsize(uintptr(size))
p := mallocgc(cap, nil, flagNoScan|flagNoZero)
p := mallocgc(cap, nil, false)
if cap != uintptr(size) {
memclr(add(p, uintptr(size)), cap-uintptr(size))
}
@ -317,7 +317,7 @@ func rawruneslice(size int) (b []rune) {
throw("out of memory")
}
mem := roundupsize(uintptr(size) * 4)
p := mallocgc(mem, nil, flagNoScan|flagNoZero)
p := mallocgc(mem, nil, false)
if mem != uintptr(size)*4 {
memclr(add(p, uintptr(size)*4), mem-uintptr(size)*4)
}