// errorcheck -0 -N -d=nil // Copyright 2013 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 that nil checks are inserted. // Optimization is disabled, so redundant checks are not removed. package p type Struct struct { X int Y float64 } type BigStruct struct { X int Y float64 A [1 << 20]int Z string } type Empty struct { } type Empty1 struct { Empty } var ( intp *int arrayp *[10]int array0p *[0]int bigarrayp *[1 << 26]int structp *Struct bigstructp *BigStruct emptyp *Empty empty1p *Empty1 ) func f1() { _ = *intp // ERROR "nil check" _ = *arrayp // ERROR "nil check" _ = *array0p // ERROR "nil check" _ = *array0p // ERROR "nil check" _ = *intp // ERROR "nil check" _ = *arrayp // ERROR "nil check" _ = *structp // ERROR "nil check" _ = *emptyp // ERROR "nil check" _ = *arrayp // ERROR "nil check" } func f2() { var ( intp *int arrayp *[10]int array0p *[0]int bigarrayp *[1 << 20]int structp *Struct bigstructp *BigStruct emptyp *Empty empty1p *Empty1 ) _ = *intp // ERROR "nil check" _ = *arrayp // ERROR "nil check" _ = *array0p // ERROR "nil check" _ = *array0p // ERROR "nil check" _ = *intp // ERROR "nil check" _ = *arrayp // ERROR "nil check" _ = *structp // ERROR "nil check" _ = *emptyp // ERROR "nil check" _ = *arrayp // ERROR "nil check" _ = *bigarrayp // ERROR "nil check" _ = *bigstructp // ERROR "nil check" _ = *empty1p // ERROR "nil check" } func fx10k() *[10000]int var b bool func f3(x *[10000]int) { // Using a huge type and huge offsets so the compiler // does not expect the memory hardware to fault. _ = x[9999] // ERROR "nil check" for { if x[9999] != 0 { // ERROR "nil check" break } } x = fx10k() _ = x[9999] // ERROR "nil check" if b { _ = x[9999] // ERROR "nil check" } else { _ = x[9999] // ERROR "nil check" } _ = x[9999] // ERROR "nil check" x = fx10k() if b { _ = x[9999] // ERROR "nil check" } else { _ = x[9999] // ERROR "nil check" } _ = x[9999] // ERROR "nil check" fx10k() // This one is a bit redundant, if we figured out that // x wasn't going to change across the function call. // But it's a little complex to do and in practice doesn't // matter enough. _ = x[9999] // ERROR "nil check" } func f3a() { x := fx10k() y := fx10k() z := fx10k() _ = &x[9] // ERROR "nil check" y = z _ = &x[9] // ERROR "nil check" x = y _ = &x[9] // ERROR "nil check" } func f3b() { x := fx10k() y := fx10k() _ = &x[9] // ERROR "nil check" y = x _ = &x[9] // ERROR "nil check" x = y _ = &x[9] // ERROR "nil check" } func fx10() *[10]int func f4(x *[10]int) { // Most of these have no checks because a real memory reference follows, // and the offset is small enough that if x is nil, the address will still be // in the first unmapped page of memory. _ = x[9] // ERROR "nil check" for { if x[9] != 0 { // ERROR "nil check" break } } x = fx10() _ = x[9] // ERROR "nil check" if b { _ = x[9] // ERROR "nil check" } else { _ = x[9] // ERROR "nil check" } _ = x[9] // ERROR "nil check" x = fx10() if b { _ = x[9] // ERROR "nil check" } else { _ = &x[9] // ERROR "nil check" } _ = x[9] // ERROR "nil check" fx10() _ = x[9] // ERROR "nil check" x = fx10() y := fx10() _ = &x[9] // ERROR "nil check" y = x _ = &x[9] // ERROR "nil check" x = y _ = &x[9] // ERROR "nil check" } func f5(m map[string]struct{}) bool { // Existence-only map lookups should not generate a nil check tmp1, tmp2 := m[""] // ERROR "removed nil check" _, ok := tmp1, tmp2 return ok }