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e3033fc535
Type switches need write barriers if the written-to variable is heap allocated. For the added needwritebarrier call, the right arg doesn't really matter, I just pass something that will never disqualify the write barrier. The left arg is the one that matters. Fixes #14306 Change-Id: Ic2754167cce062064ea2eeac2944ea4f77cc9c3b Reviewed-on: https://go-review.googlesource.com/19481 Reviewed-by: Russ Cox <rsc@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
161 lines
2.9 KiB
Go
161 lines
2.9 KiB
Go
// errorcheck -0 -l -d=wb
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test where write barriers are and are not emitted.
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package p
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import "unsafe"
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func f(x **byte, y *byte) {
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*x = y // ERROR "write barrier"
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z := y // no barrier
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*x = z // ERROR "write barrier"
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}
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func f1(x *[]byte, y []byte) {
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*x = y // ERROR "write barrier"
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z := y // no barrier
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*x = z // ERROR "write barrier"
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}
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func f1a(x *[]byte, y *[]byte) {
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*x = *y // ERROR "write barrier"
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z := *y // no barrier
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*x = z // ERROR "write barrier"
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}
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func f2(x *interface{}, y interface{}) {
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*x = y // ERROR "write barrier"
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z := y // no barrier
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*x = z // ERROR "write barrier"
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}
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func f2a(x *interface{}, y *interface{}) {
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*x = *y // ERROR "write barrier"
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z := y // no barrier
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*x = z // ERROR "write barrier"
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}
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func f3(x *string, y string) {
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*x = y // ERROR "write barrier"
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z := y // no barrier
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*x = z // ERROR "write barrier"
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}
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func f3a(x *string, y *string) {
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*x = *y // ERROR "write barrier"
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z := *y // no barrier
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*x = z // ERROR "write barrier"
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}
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func f4(x *[2]string, y [2]string) {
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*x = y // ERROR "write barrier"
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z := y // no barrier
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*x = z // ERROR "write barrier"
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}
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func f4a(x *[2]string, y *[2]string) {
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*x = *y // ERROR "write barrier"
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z := *y // no barrier
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*x = z // ERROR "write barrier"
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}
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type T struct {
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X *int
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Y int
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M map[int]int
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}
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func f5(t, u *T) {
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t.X = &u.Y // ERROR "write barrier"
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}
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func f6(t *T) {
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t.M = map[int]int{1: 2} // ERROR "write barrier"
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}
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func f7(x, y *int) []*int {
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var z [3]*int
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i := 0
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z[i] = x // ERROR "write barrier"
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i++
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z[i] = y // ERROR "write barrier"
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i++
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return z[:i]
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}
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func f9(x *interface{}, v *byte) {
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*x = v // ERROR "write barrier"
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}
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func f10(x *byte, f func(interface{})) {
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f(x)
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}
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func f11(x *unsafe.Pointer, y unsafe.Pointer) {
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*x = unsafe.Pointer(uintptr(y) + 1) // ERROR "write barrier"
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}
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func f12(x []*int, y *int) []*int {
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// write barrier for storing y in x's underlying array
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x = append(x, y) // ERROR "write barrier"
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return x
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}
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func f12a(x []int, y int) []int {
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// y not a pointer, so no write barriers in this function
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x = append(x, y)
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return x
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}
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func f13(x []int, y *[]int) {
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*y = append(x, 1) // ERROR "write barrier"
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}
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func f14(y *[]int) {
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*y = append(*y, 1) // ERROR "write barrier"
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}
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type T1 struct {
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X *int
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}
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func f15(x []T1, y T1) []T1 {
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return append(x, y) // ERROR "write barrier"
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}
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type T8 struct {
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X [8]*int
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}
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func f16(x []T8, y T8) []T8 {
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return append(x, y) // ERROR "write barrier"
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}
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func t1(i interface{}) **int {
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// From issue 14306, make sure we have write barriers in a type switch
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// where the assigned variable escapes.
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switch x := i.(type) { // ERROR "write barrier"
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case *int:
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return &x
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}
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switch y := i.(type) { // no write barrier here
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case **int:
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return y
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}
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return nil
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}
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