Editando: escape_map.go
// errorcheck -0 -m -l // 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 escape analysis for maps. package escape var sink interface{} func map0() { m := make(map[*int]*int) // ERROR "make\(map\[\*int\]\*int\) does not escape" // BAD: i should not escape i := 0 // ERROR "moved to heap: i" // BAD: j should not escape j := 0 // ERROR "moved to heap: j" m[&i] = &j _ = m } func map1() *int { m := make(map[*int]*int) // ERROR "make\(map\[\*int\]\*int\) does not escape" // BAD: i should not escape i := 0 // ERROR "moved to heap: i" j := 0 // ERROR "moved to heap: j" m[&i] = &j return m[&i] } func map2() map[*int]*int { m := make(map[*int]*int) // ERROR "make\(map\[\*int\]\*int\) escapes to heap" i := 0 // ERROR "moved to heap: i" j := 0 // ERROR "moved to heap: j" m[&i] = &j return m } func map3() []*int { m := make(map[*int]*int) // ERROR "make\(map\[\*int\]\*int\) does not escape" i := 0 // ERROR "moved to heap: i" // BAD: j should not escape j := 0 // ERROR "moved to heap: j" m[&i] = &j var r []*int for k := range m { r = append(r, k) } return r } func map4() []*int { m := make(map[*int]*int) // ERROR "make\(map\[\*int\]\*int\) does not escape" // BAD: i should not escape i := 0 // ERROR "moved to heap: i" j := 0 // ERROR "moved to heap: j" m[&i] = &j var r []*int for k, v := range m { // We want to test exactly "for k, v := range m" rather than "for _, v := range m". // The following if is merely to use (but not leak) k. if k != nil { r = append(r, v) } } return r } func map5(m map[*int]*int) { // ERROR "m does not escape" i := 0 // ERROR "moved to heap: i" j := 0 // ERROR "moved to heap: j" m[&i] = &j } func map6(m map[*int]*int) { // ERROR "m does not escape" if m != nil { m = make(map[*int]*int) // ERROR "make\(map\[\*int\]\*int\) does not escape" } i := 0 // ERROR "moved to heap: i" j := 0 // ERROR "moved to heap: j" m[&i] = &j } func map7() { // BAD: i should not escape i := 0 // ERROR "moved to heap: i" // BAD: j should not escape j := 0 // ERROR "moved to heap: j" m := map[*int]*int{&i: &j} // ERROR "map\[\*int\]\*int{...} does not escape" _ = m } func map8() { i := 0 // ERROR "moved to heap: i" j := 0 // ERROR "moved to heap: j" m := map[*int]*int{&i: &j} // ERROR "map\[\*int\]\*int{...} escapes to heap" sink = m } func map9() *int { // BAD: i should not escape i := 0 // ERROR "moved to heap: i" j := 0 // ERROR "moved to heap: j" m := map[*int]*int{&i: &j} // ERROR "map\[\*int\]\*int{...} does not escape" return m[nil] }
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