golang escape_closure 代码
文件路径：/test/escape_closure.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 closure arguments.
package escape
var sink interface{}
func ClosureCallArgs0() {
x := 0
func(p *int) { / ERROR "p does not escape" "func literal does not escape"
*p = 1
}(&x)
}
func ClosureCallArgs1() {
x := 0
for {
func(p *int) { / ERROR "p does not escape" "func literal does not escape"
*p = 1
}(&x)
}
}
func ClosureCallArgs2() {
for {
x := 0
func(p *int) { / ERROR "p does not escape" "func literal does not escape"
*p = 1
}(&x)
}
}
func ClosureCallArgs3() {
x := 0 / ERROR "moved to heap: x"
func(p *int) { / ERROR "leaking param: p" "func literal does not escape"
sink = p
}(&x)
}
func ClosureCallArgs4() {
x := 0
_ = func(p *int) *int { / ERROR "leaking param: p to result ~r0" "func literal does not escape"
return p
}(&x)
}
func ClosureCallArgs5() {
x := 0 / ERROR "moved to heap: x"
/ TODO(mdempsky): We get "leaking param: p" here because the new escape analysis pass
/ can tell that p flows directly to sink, but it's a little weird. Re-evaluate.
sink = func(p *int) *int { / ERROR "leaking param: p" "func literal does not escape"
return p
}(&x)
}
func ClosureCallArgs6() {
x := 0 / ERROR "moved to heap: x"
func(p *int) { / ERROR "moved to heap: p" "func literal does not escape"
sink = &p
}(&x)
}
func ClosureCallArgs7() {
var pp *int
for {
x := 0 / ERROR "moved to heap: x"
func(p *int) { / ERROR "leaking param: p" "func literal does not escape"
pp = p
}(&x)
}
_ = pp
}
func ClosureCallArgs8() {
x := 0
defer func(p *int) { / ERROR "p does not escape" "func literal does not escape"
*p = 1
}(&x)
}
func ClosureCallArgs9() {
/ BAD: x should not leak
x := 0 / ERROR "moved to heap: x"
for {
defer func(p *int) { / ERROR "func literal escapes to heap" "p does not escape"
*p = 1
}(&x)
}
}
func ClosureCallArgs10() {
for {
x := 0 / ERROR "moved to heap: x"
defer func(p *int) { / ERROR "func literal escapes to heap" "p does not escape"
*p = 1
}(&x)
}
}
func ClosureCallArgs11() {
x := 0 / ERROR "moved to heap: x"
defer func(p *int) { / ERROR "leaking param: p" "func literal does not escape"
sink = p
}(&x)
}
func ClosureCallArgs12() {
x := 0
defer func(p *int) *int { / ERROR "leaking param: p to result ~r0" "func literal does not escape"
return p
}(&x)
}
func ClosureCallArgs13() {
x := 0 / ERROR "moved to heap: x"
defer func(p *int) { / ERROR "moved to heap: p" "func literal does not escape"
sink = &p
}(&x)
}
func ClosureCallArgs14() {
x := 0
p := &x
_ = func(p **int) *int { / ERROR "leaking param: p to result ~r0 level=1" "func literal does not escape"
return *p
}(&p)
}
func ClosureCallArgs15() {
x := 0 / ERROR "moved to heap: x"
p := &x
sink = func(p **int) *int { / ERROR "leaking param content: p" "func literal does not escape"
return *p
}(&p)
}
func ClosureLeak1(s string) string { / ERROR "s does not escape"
t := s + "YYYY" / ERROR "escapes to heap"
return ClosureLeak1a(t) / ERROR "... argument does not escape"
}
/ See #14409 -- returning part of captured var leaks it.
func ClosureLeak1a(a ...string) string { / ERROR "leaking param: a to result ~r0 level=1$"
return func() string { / ERROR "func literal does not escape"
return a[0]
}()
}
func ClosureLeak2(s string) string { / ERROR "s does not escape"
t := s + "YYYY" / ERROR "escapes to heap"
c := ClosureLeak2a(t) / ERROR "... argument does not escape"
return c
}
func ClosureLeak2a(a ...string) string { / ERROR "leaking param content: a"
return ClosureLeak2b(func() string { / ERROR "func literal does not escape"
return a[0]
})
}
func ClosureLeak2b(f func() string) string { / ERROR "f does not escape"
return f()
}
func ClosureIndirect() {
f := func(p *int) {} / ERROR "p does not escape" "func literal does not escape"
f(new(int)) / ERROR "new\(int\) does not escape"
g := f
g(new(int)) / ERROR "new\(int\) does not escape"
h := nopFunc
h(new(int)) / ERROR "new\(int\) does not escape"
}
func nopFunc(p *int) {} / ERROR "p does not escape"