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The false positives (var incorrectly escapes) are marked with BAD. Change-Id: If64fabb6ea96de44a1177d9ab12e2ccc579fe0c4 Reviewed-on: https://go-review.googlesource.com/5294 Reviewed-by: Keith Randall <khr@golang.org>
108 lines
3.3 KiB
Go
108 lines
3.3 KiB
Go
// errorcheck -0 -m -l
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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 escape analysis for maps.
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package escape
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var sink interface{}
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func map0() {
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m := make(map[*int]*int) // ERROR "make\(map\[\*int\]\*int\) does not escape"
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// BAD: i should not escape
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i := 0 // ERROR "moved to heap: i"
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// BAD: j should not escape
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j := 0 // ERROR "moved to heap: j"
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m[&i] = &j // ERROR "&i escapes to heap" "&j escapes to heap"
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_ = m
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}
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func map1() *int {
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m := make(map[*int]*int) // ERROR "make\(map\[\*int\]\*int\) does not escape"
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// BAD: i should not escape
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i := 0 // ERROR "moved to heap: i"
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j := 0 // ERROR "moved to heap: j"
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m[&i] = &j // ERROR "&i escapes to heap" "&j escapes to heap"
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return m[&i] // ERROR "&i does not escape"
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}
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func map2() map[*int]*int {
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m := make(map[*int]*int) // ERROR "make\(map\[\*int\]\*int\) escapes to heap"
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i := 0 // ERROR "moved to heap: i"
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j := 0 // ERROR "moved to heap: j"
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m[&i] = &j // ERROR "&i escapes to heap" "&j escapes to heap"
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return m
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}
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func map3() []*int {
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m := make(map[*int]*int) // ERROR "make\(map\[\*int\]\*int\) does not escape"
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i := 0 // ERROR "moved to heap: i"
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// BAD: j should not escape
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j := 0 // ERROR "moved to heap: j"
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m[&i] = &j // ERROR "&i escapes to heap" "&j escapes to heap"
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var r []*int
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for k := range m {
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r = append(r, k)
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}
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return r
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}
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func map4() []*int {
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m := make(map[*int]*int) // ERROR "make\(map\[\*int\]\*int\) does not escape"
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// BAD: i should not escape
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i := 0 // ERROR "moved to heap: i"
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j := 0 // ERROR "moved to heap: j"
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m[&i] = &j // ERROR "&i escapes to heap" "&j escapes to heap"
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var r []*int
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for k, v := range m {
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// We want to test exactly "for k, v := range m" rather than "for _, v := range m".
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// The following if is merely to use (but not leak) k.
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if k != nil {
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r = append(r, v)
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}
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}
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return r
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}
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func map5(m map[*int]*int) { // ERROR "m does not escape"
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i := 0 // ERROR "moved to heap: i"
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j := 0 // ERROR "moved to heap: j"
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m[&i] = &j // ERROR "&i escapes to heap" "&j escapes to heap"
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}
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func map6(m map[*int]*int) { // ERROR "m does not escape"
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if m != nil {
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m = make(map[*int]*int) // ERROR "make\(map\[\*int\]\*int\) does not escape"
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}
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i := 0 // ERROR "moved to heap: i"
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j := 0 // ERROR "moved to heap: j"
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m[&i] = &j // ERROR "&i escapes to heap" "&j escapes to heap"
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}
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func map7() {
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// BAD: i should not escape
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i := 0 // ERROR "moved to heap: i"
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// BAD: j should not escape
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j := 0 // ERROR "moved to heap: j"
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m := map[*int]*int{&i: &j} // ERROR "&i escapes to heap" "&j escapes to heap" "literal does not escape"
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_ = m
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}
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func map8() {
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i := 0 // ERROR "moved to heap: i"
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j := 0 // ERROR "moved to heap: j"
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m := map[*int]*int{&i: &j} // ERROR "&i escapes to heap" "&j escapes to heap" "literal escapes to heap"
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sink = m // ERROR "m escapes to heap"
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}
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func map9() *int {
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// BAD: i should not escape
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i := 0 // ERROR "moved to heap: i"
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j := 0 // ERROR "moved to heap: j"
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m := map[*int]*int{&i: &j} // ERROR "&i escapes to heap" "&j escapes to heap" "literal does not escape"
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return m[nil]
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}
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