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escape_map.go
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// 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 // ERROR "&i escapes to heap" "&j escapes to heap"
_ = 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 // ERROR "&i escapes to heap" "&j escapes to heap"
return m[&i] // ERROR "&i does not escape"
}
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 // ERROR "&i escapes to heap" "&j escapes to heap"
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 // ERROR "&i escapes to heap" "&j escapes to heap"
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 // ERROR "&i escapes to heap" "&j escapes to heap"
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 // ERROR "&i escapes to heap" "&j escapes to heap"
}
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 // ERROR "&i escapes to heap" "&j escapes to heap"
}
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 "&i escapes to heap" "&j escapes to heap" "literal 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 "&i escapes to heap" "&j escapes to heap" "literal escapes to heap"
sink = m // ERROR "m escapes to heap"
}
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 "&i escapes to heap" "&j escapes to heap" "literal does not escape"
return m[nil]
}