// errorcheck -+ -p=runtime // Copyright 2016 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 go:nowritebarrier and related directives. // This must appear to be in package runtime so the compiler // recognizes "systemstack". package runtime type t struct { f *t } var x t var y *t //go:nowritebarrier func a1() { x.f = y // ERROR "write barrier prohibited" a2() // no error } //go:noinline func a2() { x.f = y } //go:nowritebarrierrec func b1() { b2() } //go:noinline func b2() { x.f = y // ERROR "write barrier prohibited by caller" } // Test recursive cycles through nowritebarrierrec and yeswritebarrierrec. //go:nowritebarrierrec func c1() { c2() } //go:yeswritebarrierrec func c2() { c3() } func c3() { x.f = y c4() } //go:nowritebarrierrec func c4() { c2() } //go:nowritebarrierrec func d1() { d2() } func d2() { d3() } //go:noinline func d3() { x.f = y // ERROR "write barrier prohibited by caller" d4() } //go:yeswritebarrierrec func d4() { d2() } //go:noinline func systemstack(func()) {} //go:nowritebarrierrec func e1() { systemstack(e2) systemstack(func() { x.f = y // ERROR "write barrier prohibited by caller" }) } func e2() { x.f = y // ERROR "write barrier prohibited by caller" }