runtime: use type int to specify size for newarray

Consistently use type int for the size argument of
runtime.newarray, runtime.reflect_unsafe_NewArray
and reflect.unsafe_NewArray.

Change-Id: Ic77bf2dde216c92ca8c49462f8eedc0385b6314e
Reviewed-on: https://go-review.googlesource.com/22311Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Martin Möhrmann <martisch@uos.de>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/runtime/chan.go

@@ -84,7 +84,7 @@ func makechan(t *chantype, size int64) *hchan {
 		}
 	} else {
 		c = new(hchan)
-		c.buf = newarray(elem, uintptr(size))
+		c.buf = newarray(elem, int(size))
 	}
 	c.elemsize = uint16(elem.size)
 	c.elemtype = elem

src/runtime/hashmap.go

@@ -246,7 +246,7 @@ func makemap(t *maptype, hint int64, h *hmap, bucket unsafe.Pointer) *hmap {
 	// If hint is large zeroing this memory could take a while.
 	buckets := bucket
 	if B != 0 {
-		buckets = newarray(t.bucket, uintptr(1)<<B)
+		buckets = newarray(t.bucket, 1<<B)
 	}
 
 	// initialize Hmap
@@ -821,7 +821,7 @@ func hashGrow(t *maptype, h *hmap) {
 		throw("evacuation not done in time")
 	}
 	oldbuckets := h.buckets
-	newbuckets := newarray(t.bucket, uintptr(1)<<(h.B+1))
+	newbuckets := newarray(t.bucket, 1<<(h.B+1))
 	flags := h.flags &^ (iterator | oldIterator)
 	if h.flags&iterator != 0 {
 		flags |= oldIterator

src/runtime/malloc.go

@@ -770,16 +770,16 @@ func reflect_unsafe_New(typ *_type) unsafe.Pointer {
 	return newobject(typ)
 }
 
-// implementation of make builtin for slices
-func newarray(typ *_type, n uintptr) unsafe.Pointer {
-	if int(n) < 0 || n > maxSliceCap(typ.size) {
+// newarray allocates an array of n elements of type typ.
+func newarray(typ *_type, n int) unsafe.Pointer {
+	if n < 0 || uintptr(n) > maxSliceCap(typ.size) {
 		panic(plainError("runtime: allocation size out of range"))
 	}
-	return mallocgc(typ.size*n, typ, true)
+	return mallocgc(typ.size*uintptr(n), typ, true)
 }
 
 //go:linkname reflect_unsafe_NewArray reflect.unsafe_NewArray
-func reflect_unsafe_NewArray(typ *_type, n uintptr) unsafe.Pointer {
+func reflect_unsafe_NewArray(typ *_type, n int) unsafe.Pointer {
 	return newarray(typ, n)
 }