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go/test/escape_map.go
Cuong Manh Le 2c95e3a6a8 cmd/compile: use clearer error message for stuct literal
This CL changes "T literal.M" error message to "T{...}.M". It's clearer
expression and focusing user on actual issue.

Updates #38745

Change-Id: I84b455a86742f37e0bde5bf390aa02984eecc3c9
Reviewed-on: https://go-review.googlesource.com/c/go/+/253677
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-09-12 08:31:49 +00:00

108 lines
2.8 KiB
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]
}