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// errorcheck -0 -l -d=wb // Copyright 2015 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 where write barriers are and are not emitted. package p import "unsafe" func f(x **byte, y *byte) { *x = y // no barrier (dead store) z := y // no barrier *x = z // ERROR "write barrier" } func f1(x *[]byte, y []byte) { *x = y // no barrier (dead store) z := y // no barrier *x = z // ERROR "write barrier" } func f1a(x *[]byte, y *[]byte) { *x = *y // ERROR "write barrier" z := *y // no barrier *x = z // ERROR "write barrier" } func f2(x *interface{}, y interface{}) { *x = y // no barrier (dead store) z := y // no barrier *x = z // ERROR "write barrier" } func f2a(x *interface{}, y *interface{}) { *x = *y // no barrier (dead store) z := y // no barrier *x = z // ERROR "write barrier" } func f3(x *string, y string) { *x = y // no barrier (dead store) z := y // no barrier *x = z // ERROR "write barrier" } func f3a(x *string, y *string) { *x = *y // ERROR "write barrier" z := *y // no barrier *x = z // ERROR "write barrier" } func f4(x *[2]string, y [2]string) { *x = y // ERROR "write barrier" z := y // no barrier *x = z // ERROR "write barrier" } func f4a(x *[2]string, y *[2]string) { *x = *y // ERROR "write barrier" z := *y // no barrier *x = z // ERROR "write barrier" } type T struct { X *int Y int M map[int]int } func f5(t, u *T) { t.X = &u.Y // ERROR "write barrier" } func f6(t *T) { t.M = map[int]int{1: 2} // ERROR "write barrier" } func f7(x, y *int) []*int { var z [3]*int i := 0 z[i] = x // ERROR "write barrier" i++ z[i] = y // ERROR "write barrier" i++ return z[:i] } func f9(x *interface{}, v *byte) { *x = v // ERROR "write barrier" } func f10(x *byte, f func(interface{})) { f(x) } func f11(x *unsafe.Pointer, y unsafe.Pointer) { *x = unsafe.Pointer(uintptr(y) + 1) // ERROR "write barrier" } func f12(x []*int, y *int) []*int { // write barrier for storing y in x's underlying array x = append(x, y) // ERROR "write barrier" return x } func f12a(x []int, y int) []int { // y not a pointer, so no write barriers in this function x = append(x, y) return x } func f13(x []int, y *[]int) { *y = append(x, 1) // ERROR "write barrier" } func f14(y *[]int) { *y = append(*y, 1) // ERROR "write barrier" } type T1 struct { X *int } func f15(x []T1, y T1) []T1 { return append(x, y) // ERROR "write barrier" } type T8 struct { X [8]*int } func f16(x []T8, y T8) []T8 { return append(x, y) // ERROR "write barrier" } func t1(i interface{}) **int { // From issue 14306, make sure we have write barriers in a type switch // where the assigned variable escapes. switch x := i.(type) { case *int: // ERROR "write barrier" return &x } switch y := i.(type) { case **int: // no write barrier here return y } return nil } type T17 struct { f func(*T17) } func f17(x *T17) { // Originally from golang.org/issue/13901, but the hybrid // barrier requires both to have barriers. x.f = f17 // ERROR "write barrier" x.f = func(y *T17) { *y = *x } // ERROR "write barrier" } type T18 struct { a []int s string } func f18(p *T18, x *[]int) { p.a = p.a[:5] // no barrier *x = (*x)[0:5] // no barrier p.a = p.a[3:5] // ERROR "write barrier" p.a = p.a[1:2:3] // ERROR "write barrier" p.s = p.s[8:9] // ERROR "write barrier" *x = (*x)[3:5] // ERROR "write barrier" } func f19(x, y *int, i int) int { // Constructing a temporary slice on the stack should not // require any write barriers. See issue 14263. a := []*int{x, y} // no barrier return *a[i] } func f20(x, y *int, i int) []*int { // ... but if that temporary slice escapes, then the // write barriers are necessary. a := []*int{x, y} // ERROR "write barrier" return a } var x21 *int var y21 struct { x *int } var z21 int // f21x: Global -> heap pointer updates must have write barriers. func f21a(x *int) { x21 = x // ERROR "write barrier" y21.x = x // ERROR "write barrier" } func f21b(x *int) { x21 = &z21 // ERROR "write barrier" y21.x = &z21 // ERROR "write barrier" } func f21c(x *int) { y21 = struct{ x *int }{x} // ERROR "write barrier" } func f22(x *int) (y *int) { // pointer write on stack should have no write barrier. // this is a case that the frontend failed to eliminate. p := &y *p = x // no barrier return } type T23 struct { p *int a int } var t23 T23 var i23 int // f23x: zeroing global needs write barrier for the hybrid barrier. func f23a() { t23 = T23{} // ERROR "write barrier" } func f23b() { // also test partial assignments t23 = T23{a: 1} // ERROR "write barrier" } func f23c() { t23 = T23{} // no barrier (dead store) // also test partial assignments t23 = T23{p: &i23} // ERROR "write barrier" } var g int func f24() **int { p := new(*int) *p = &g // no write barrier here return p } func f25() []string { return []string{"abc", "def", "ghi"} // no write barrier here } type T26 struct { a, b, c int d, e, f *int } var g26 int func f26(p *int) *T26 { // see issue 29573 return &T26{ a: 5, b: 6, c: 7, d: &g26, // no write barrier: global ptr e: nil, // no write barrier: nil ptr f: p, // ERROR "write barrier" } } func f27(p *int) []interface{} { return []interface{}{ nil, // no write barrier: zeroed memory, nil ptr (*T26)(nil), // no write barrier: zeroed memory, type ptr & nil ptr &g26, // no write barrier: zeroed memory, type ptr & global ptr 7, // no write barrier: zeroed memory, type ptr & global ptr p, // ERROR "write barrier" } } var g28 [256]uint64 func f28() []interface{} { return []interface{}{ false, // no write barrier true, // no write barrier 0, // no write barrier 1, // no write barrier uint8(127), // no write barrier int8(-4), // no write barrier &g28[5], // no write barrier } }