This allows maphash.Hash to be allocated on the stack for typical uses.
Fixes #35636
Change-Id: I8366507d26ea717f47a9fb46d3bd69ba799845ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/207444
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
}
//go:linkname runtime_memhash runtime.memhash
+//go:noescape
func runtime_memhash(p unsafe.Pointer, seed, s uintptr) uintptr
// Sum appends the hash's current 64-bit value to b.
--- /dev/null
+// errorcheck -0 -m -l
+
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Test escape analysis for hash/maphash.
+
+package escape
+
+import (
+ "hash/maphash"
+)
+
+func f() {
+ var x maphash.Hash // should be stack allocatable
+ x.WriteString("foo")
+ x.Sum64()
+}