mirror of
https://github.com/golang/go
synced 2024-11-25 07:07:57 -07:00
148fac79a3
Functions without bodies were excluded from the ordering logic, because when I wrote the ordering logic there was no reason to analyze them. But then we added //go:noescape tags that need analysis, and we didn't update the ordering logic. So in the absence of good ordering, //go:noescape only worked if it appeared before the use in the source code. Fixes #5773. R=golang-dev, r CC=golang-dev https://golang.org/cl/10570043
1359 lines
26 KiB
Go
1359 lines
26 KiB
Go
// errorcheck -0 -m -l
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// Copyright 2010 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, using compiler diagnostic flags, that the escape analysis is working.
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// Compiles but does not run. Inlining is disabled.
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package foo
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import (
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"fmt"
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"unsafe"
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)
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var gxx *int
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func foo1(x int) { // ERROR "moved to heap: x"
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gxx = &x // ERROR "&x escapes to heap"
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}
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func foo2(yy *int) { // ERROR "leaking param: yy"
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gxx = yy
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}
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func foo3(x int) *int { // ERROR "moved to heap: x"
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return &x // ERROR "&x escapes to heap"
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}
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type T *T
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func foo3b(t T) { // ERROR "leaking param: t"
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*t = t
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}
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// xx isn't going anywhere, so use of yy is ok
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func foo4(xx, yy *int) { // ERROR "xx does not escape" "yy does not escape"
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xx = yy
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}
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// xx isn't going anywhere, so taking address of yy is ok
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func foo5(xx **int, yy *int) { // ERROR "xx does not escape" "yy does not escape"
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xx = &yy // ERROR "&yy does not escape"
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}
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func foo6(xx **int, yy *int) { // ERROR "xx does not escape" "leaking param: yy"
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*xx = yy
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}
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func foo7(xx **int, yy *int) { // ERROR "xx does not escape" "yy does not escape"
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**xx = *yy
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}
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func foo8(xx, yy *int) int { // ERROR "xx does not escape" "yy does not escape"
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xx = yy
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return *xx
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}
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func foo9(xx, yy *int) *int { // ERROR "leaking param: xx" "leaking param: yy"
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xx = yy
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return xx
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}
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func foo10(xx, yy *int) { // ERROR "xx does not escape" "yy does not escape"
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*xx = *yy
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}
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func foo11() int {
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x, y := 0, 42
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xx := &x // ERROR "&x does not escape"
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yy := &y // ERROR "&y does not escape"
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*xx = *yy
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return x
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}
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var xxx **int
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func foo12(yyy **int) { // ERROR "leaking param: yyy"
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xxx = yyy
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}
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// Must treat yyy as leaking because *yyy leaks, and the escape analysis
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// summaries in exported metadata do not distinguish these two cases.
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func foo13(yyy **int) { // ERROR "leaking param: yyy"
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*xxx = *yyy
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}
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func foo14(yyy **int) { // ERROR "yyy does not escape"
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**xxx = **yyy
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}
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func foo15(yy *int) { // ERROR "moved to heap: yy"
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xxx = &yy // ERROR "&yy escapes to heap"
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}
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func foo16(yy *int) { // ERROR "leaking param: yy"
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*xxx = yy
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}
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func foo17(yy *int) { // ERROR "yy does not escape"
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**xxx = *yy
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}
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func foo18(y int) { // ERROR "moved to heap: "y"
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*xxx = &y // ERROR "&y escapes to heap"
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}
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func foo19(y int) {
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**xxx = y
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}
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type Bar struct {
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i int
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ii *int
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}
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func NewBar() *Bar {
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return &Bar{42, nil} // ERROR "&Bar literal escapes to heap"
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}
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func NewBarp(x *int) *Bar { // ERROR "leaking param: x"
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return &Bar{42, x} // ERROR "&Bar literal escapes to heap"
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}
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func NewBarp2(x *int) *Bar { // ERROR "x does not escape"
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return &Bar{*x, nil} // ERROR "&Bar literal escapes to heap"
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}
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func (b *Bar) NoLeak() int { // ERROR "b does not escape"
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return *(b.ii)
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}
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func (b *Bar) Leak() *int { // ERROR "leaking param: b"
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return &b.i // ERROR "&b.i escapes to heap"
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}
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func (b *Bar) AlsoNoLeak() *int { // ERROR "b does not escape"
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return b.ii
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}
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func (b Bar) AlsoLeak() *int { // ERROR "leaking param: b"
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return b.ii
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}
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func (b Bar) LeaksToo() *int { // ERROR "leaking param: b"
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v := 0 // ERROR "moved to heap: v"
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b.ii = &v // ERROR "&v escapes"
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return b.ii
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}
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func (b *Bar) LeaksABit() *int { // ERROR "b does not escape"
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v := 0 // ERROR "moved to heap: v"
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b.ii = &v // ERROR "&v escapes"
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return b.ii
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}
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func (b Bar) StillNoLeak() int { // ERROR "b does not escape"
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v := 0
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b.ii = &v // ERROR "&v does not escape"
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return b.i
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}
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func goLeak(b *Bar) { // ERROR "leaking param: b"
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go b.NoLeak()
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}
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type Bar2 struct {
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i [12]int
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ii []int
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}
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func NewBar2() *Bar2 {
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return &Bar2{[12]int{42}, nil} // ERROR "&Bar2 literal escapes to heap"
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}
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func (b *Bar2) NoLeak() int { // ERROR "b does not escape"
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return b.i[0]
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}
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func (b *Bar2) Leak() []int { // ERROR "leaking param: b"
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return b.i[:] // ERROR "b.i escapes to heap"
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}
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func (b *Bar2) AlsoNoLeak() []int { // ERROR "b does not escape"
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return b.ii[0:1]
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}
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func (b Bar2) AgainNoLeak() [12]int { // ERROR "b does not escape"
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return b.i
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}
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func (b *Bar2) LeakSelf() { // ERROR "leaking param: b"
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b.ii = b.i[0:4] // ERROR "b.i escapes to heap"
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}
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func (b *Bar2) LeakSelf2() { // ERROR "leaking param: b"
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var buf []int
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buf = b.i[0:] // ERROR "b.i escapes to heap"
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b.ii = buf
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}
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func foo21() func() int {
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x := 42 // ERROR "moved to heap: x"
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return func() int { // ERROR "func literal escapes to heap"
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return x // ERROR "&x escapes to heap"
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}
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}
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func foo22() int {
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x := 42
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return func() int { // ERROR "func literal does not escape"
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return x
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}()
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}
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func foo23(x int) func() int { // ERROR "moved to heap: x"
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return func() int { // ERROR "func literal escapes to heap"
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return x // ERROR "&x escapes to heap"
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}
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}
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func foo23a(x int) func() int { // ERROR "moved to heap: x"
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f := func() int { // ERROR "func literal escapes to heap"
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return x // ERROR "&x escapes to heap"
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}
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return f
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}
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func foo23b(x int) *(func() int) { // ERROR "moved to heap: x"
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f := func() int { return x } // ERROR "moved to heap: f" "func literal escapes to heap" "&x escapes to heap"
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return &f // ERROR "&f escapes to heap"
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}
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func foo24(x int) int {
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return func() int { // ERROR "func literal does not escape"
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return x
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}()
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}
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var x *int
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func fooleak(xx *int) int { // ERROR "leaking param: xx"
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x = xx
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return *x
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}
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func foonoleak(xx *int) int { // ERROR "xx does not escape"
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return *x + *xx
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}
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func foo31(x int) int { // ERROR "moved to heap: x"
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return fooleak(&x) // ERROR "&x escapes to heap"
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}
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func foo32(x int) int {
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return foonoleak(&x) // ERROR "&x does not escape"
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}
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type Foo struct {
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xx *int
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x int
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}
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var F Foo
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var pf *Foo
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func (f *Foo) fooleak() { // ERROR "leaking param: f"
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pf = f
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}
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func (f *Foo) foonoleak() { // ERROR "f does not escape"
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F.x = f.x
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}
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func (f *Foo) Leak() { // ERROR "leaking param: f"
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f.fooleak()
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}
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func (f *Foo) NoLeak() { // ERROR "f does not escape"
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f.foonoleak()
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}
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func foo41(x int) { // ERROR "moved to heap: x"
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F.xx = &x // ERROR "&x escapes to heap"
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}
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func (f *Foo) foo42(x int) { // ERROR "f does not escape" "moved to heap: x"
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f.xx = &x // ERROR "&x escapes to heap"
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}
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func foo43(f *Foo, x int) { // ERROR "f does not escape" "moved to heap: x"
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f.xx = &x // ERROR "&x escapes to heap"
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}
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func foo44(yy *int) { // ERROR "leaking param: yy"
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F.xx = yy
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}
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func (f *Foo) foo45() { // ERROR "f does not escape"
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F.x = f.x
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}
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// See foo13 above for explanation of why f leaks.
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func (f *Foo) foo46() { // ERROR "leaking param: f"
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F.xx = f.xx
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}
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func (f *Foo) foo47() { // ERROR "leaking param: f"
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f.xx = &f.x // ERROR "&f.x escapes to heap"
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}
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var ptrSlice []*int
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func foo50(i *int) { // ERROR "leaking param: i"
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ptrSlice[0] = i
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}
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var ptrMap map[*int]*int
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func foo51(i *int) { // ERROR "leaking param: i"
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ptrMap[i] = i
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}
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func indaddr1(x int) *int { // ERROR "moved to heap: x"
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return &x // ERROR "&x escapes to heap"
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}
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func indaddr2(x *int) *int { // ERROR "leaking param: x"
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return *&x // ERROR "&x does not escape"
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}
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func indaddr3(x *int32) *int { // ERROR "leaking param: x"
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return *(**int)(unsafe.Pointer(&x)) // ERROR "&x does not escape"
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}
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// From package math:
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func Float32bits(f float32) uint32 {
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return *(*uint32)(unsafe.Pointer(&f)) // ERROR "&f does not escape"
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}
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func Float32frombits(b uint32) float32 {
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return *(*float32)(unsafe.Pointer(&b)) // ERROR "&b does not escape"
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}
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func Float64bits(f float64) uint64 {
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return *(*uint64)(unsafe.Pointer(&f)) // ERROR "&f does not escape"
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}
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func Float64frombits(b uint64) float64 {
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return *(*float64)(unsafe.Pointer(&b)) // ERROR "&b does not escape"
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}
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// contrast with
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func float64bitsptr(f float64) *uint64 { // ERROR "moved to heap: f"
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return (*uint64)(unsafe.Pointer(&f)) // ERROR "&f escapes to heap"
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}
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func float64ptrbitsptr(f *float64) *uint64 { // ERROR "leaking param: f"
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return (*uint64)(unsafe.Pointer(f))
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}
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func typesw(i interface{}) *int { // ERROR "leaking param: i"
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switch val := i.(type) {
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case *int:
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return val
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case *int8:
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v := int(*val) // ERROR "moved to heap: v"
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return &v // ERROR "&v escapes to heap"
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}
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return nil
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}
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func exprsw(i *int) *int { // ERROR "leaking param: i"
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switch j := i; *j + 110 {
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case 12:
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return j
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case 42:
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return nil
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}
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return nil
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}
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// assigning to an array element is like assigning to the array
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func foo60(i *int) *int { // ERROR "leaking param: i"
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var a [12]*int
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a[0] = i
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return a[1]
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}
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func foo60a(i *int) *int { // ERROR "i does not escape"
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var a [12]*int
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a[0] = i
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return nil
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}
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// assigning to a struct field is like assigning to the struct
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func foo61(i *int) *int { // ERROR "leaking param: i"
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type S struct {
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a, b *int
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}
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var s S
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s.a = i
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return s.b
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}
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func foo61a(i *int) *int { // ERROR "i does not escape"
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type S struct {
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a, b *int
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}
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var s S
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s.a = i
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return nil
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}
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// assigning to a struct field is like assigning to the struct but
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// here this subtlety is lost, since s.a counts as an assignment to a
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// track-losing dereference.
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func foo62(i *int) *int { // ERROR "leaking param: i"
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type S struct {
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a, b *int
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}
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s := new(S) // ERROR "new[(]S[)] does not escape"
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s.a = i
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return nil // s.b
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}
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type M interface {
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M()
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}
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func foo63(m M) { // ERROR "m does not escape"
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}
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func foo64(m M) { // ERROR "leaking param: m"
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m.M()
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}
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func foo64b(m M) { // ERROR "leaking param: m"
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defer m.M()
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}
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type MV int
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func (MV) M() {}
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func foo65() {
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var mv MV
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foo63(&mv) // ERROR "&mv does not escape"
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}
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func foo66() {
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var mv MV // ERROR "moved to heap: mv"
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foo64(&mv) // ERROR "&mv escapes to heap"
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}
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func foo67() {
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var mv MV
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foo63(mv)
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}
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func foo68() {
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var mv MV
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foo64(mv) // escapes but it's an int so irrelevant
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}
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func foo69(m M) { // ERROR "leaking param: m"
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foo64(m)
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}
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func foo70(mv1 *MV, m M) { // ERROR "leaking param: mv1" "leaking param: m"
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m = mv1
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foo64(m)
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}
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func foo71(x *int) []*int { // ERROR "leaking param: x"
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var y []*int
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y = append(y, x)
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return y
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}
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func foo71a(x int) []*int { // ERROR "moved to heap: x"
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var y []*int
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y = append(y, &x) // ERROR "&x escapes to heap"
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return y
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}
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func foo72() {
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var x int
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var y [1]*int
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y[0] = &x // ERROR "&x does not escape"
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}
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func foo72aa() [10]*int {
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var x int // ERROR "moved to heap: x"
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var y [10]*int
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y[0] = &x // ERROR "&x escapes to heap"
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return y
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}
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func foo72a() {
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var y [10]*int
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for i := 0; i < 10; i++ {
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// escapes its scope
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x := i // ERROR "moved to heap: x"
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y[i] = &x // ERROR "&x escapes to heap"
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}
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return
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}
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func foo72b() [10]*int {
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var y [10]*int
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for i := 0; i < 10; i++ {
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x := i // ERROR "moved to heap: x"
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y[i] = &x // ERROR "&x escapes to heap"
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}
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return y
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}
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// issue 2145
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func foo73() {
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s := []int{3, 2, 1} // ERROR "\[\]int literal does not escape"
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for _, v := range s {
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vv := v // ERROR "moved to heap: vv"
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// actually just escapes its scope
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defer func() { // ERROR "func literal escapes to heap"
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println(vv) // ERROR "&vv escapes to heap"
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}()
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}
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}
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func foo74() {
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s := []int{3, 2, 1} // ERROR "\[\]int literal does not escape"
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for _, v := range s {
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vv := v // ERROR "moved to heap: vv"
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// actually just escapes its scope
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fn := func() { // ERROR "func literal escapes to heap"
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println(vv) // ERROR "&vv escapes to heap"
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}
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defer fn()
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}
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}
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// issue 3975
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func foo74b() {
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var array [3]func()
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s := []int{3, 2, 1} // ERROR "\[\]int literal does not escape"
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for i, v := range s {
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vv := v // ERROR "moved to heap: vv"
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// actually just escapes its scope
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array[i] = func() { // ERROR "func literal escapes to heap"
|
|
println(vv) // ERROR "&vv escapes to heap"
|
|
}
|
|
}
|
|
}
|
|
|
|
func myprint(y *int, x ...interface{}) *int { // ERROR "x does not escape" "leaking param: y"
|
|
return y
|
|
}
|
|
|
|
func myprint1(y *int, x ...interface{}) *interface{} { // ERROR "y does not escape" "leaking param: x"
|
|
return &x[0] // ERROR "&x.0. escapes to heap"
|
|
}
|
|
|
|
func foo75(z *int) { // ERROR "z does not escape"
|
|
myprint(z, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
|
|
}
|
|
|
|
func foo75a(z *int) { // ERROR "z does not escape"
|
|
myprint1(z, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
|
|
}
|
|
|
|
func foo75esc(z *int) { // ERROR "leaking param: z"
|
|
gxx = myprint(z, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
|
|
}
|
|
|
|
func foo75aesc(z *int) { // ERROR "z does not escape"
|
|
var ppi **interface{} // assignments to pointer dereferences lose track
|
|
*ppi = myprint1(z, 1, 2, 3) // ERROR "[.][.][.] argument escapes to heap"
|
|
}
|
|
|
|
func foo76(z *int) { // ERROR "leaking param: z"
|
|
myprint(nil, z) // ERROR "[.][.][.] argument does not escape"
|
|
}
|
|
|
|
func foo76a(z *int) { // ERROR "leaking param: z"
|
|
myprint1(nil, z) // ERROR "[.][.][.] argument does not escape"
|
|
}
|
|
|
|
func foo76b() {
|
|
myprint(nil, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
|
|
}
|
|
|
|
func foo76c() {
|
|
myprint1(nil, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
|
|
}
|
|
|
|
func foo76d() {
|
|
defer myprint(nil, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
|
|
}
|
|
|
|
func foo76e() {
|
|
defer myprint1(nil, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
|
|
}
|
|
|
|
func foo76f() {
|
|
for {
|
|
// TODO: This one really only escapes its scope, but we don't distinguish yet.
|
|
defer myprint(nil, 1, 2, 3) // ERROR "[.][.][.] argument escapes to heap"
|
|
}
|
|
}
|
|
|
|
func foo76g() {
|
|
for {
|
|
defer myprint1(nil, 1, 2, 3) // ERROR "[.][.][.] argument escapes to heap"
|
|
}
|
|
}
|
|
|
|
func foo77(z []interface{}) { // ERROR "z does not escape"
|
|
myprint(nil, z...) // z does not escape
|
|
}
|
|
|
|
func foo77a(z []interface{}) { // ERROR "z does not escape"
|
|
myprint1(nil, z...)
|
|
}
|
|
|
|
func foo77b(z []interface{}) { // ERROR "leaking param: z"
|
|
var ppi **interface{}
|
|
*ppi = myprint1(nil, z...)
|
|
}
|
|
|
|
func foo78(z int) *int { // ERROR "moved to heap: z"
|
|
return &z // ERROR "&z escapes to heap"
|
|
}
|
|
|
|
func foo78a(z int) *int { // ERROR "moved to heap: z"
|
|
y := &z // ERROR "&z escapes to heap"
|
|
x := &y // ERROR "&y does not escape"
|
|
return *x // really return y
|
|
}
|
|
|
|
func foo79() *int {
|
|
return new(int) // ERROR "new[(]int[)] escapes to heap"
|
|
}
|
|
|
|
func foo80() *int {
|
|
var z *int
|
|
for {
|
|
// Really just escapes its scope but we don't distinguish
|
|
z = new(int) // ERROR "new[(]int[)] escapes to heap"
|
|
}
|
|
_ = z
|
|
return nil
|
|
}
|
|
|
|
func foo81() *int {
|
|
for {
|
|
z := new(int) // ERROR "new[(]int[)] does not escape"
|
|
_ = z
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func tee(p *int) (x, y *int) { return p, p } // ERROR "leaking param"
|
|
|
|
func noop(x, y *int) {} // ERROR "does not escape"
|
|
|
|
func foo82() {
|
|
var x, y, z int // ERROR "moved to heap"
|
|
go noop(tee(&z)) // ERROR "&z escapes to heap"
|
|
go noop(&x, &y) // ERROR "escapes to heap"
|
|
for {
|
|
var u, v, w int // ERROR "moved to heap"
|
|
defer noop(tee(&u)) // ERROR "&u escapes to heap"
|
|
defer noop(&v, &w) // ERROR "escapes to heap"
|
|
}
|
|
}
|
|
|
|
type Fooer interface {
|
|
Foo()
|
|
}
|
|
|
|
type LimitedFooer struct {
|
|
Fooer
|
|
N int64
|
|
}
|
|
|
|
func LimitFooer(r Fooer, n int64) Fooer { // ERROR "leaking param: r"
|
|
return &LimitedFooer{r, n} // ERROR "&LimitedFooer literal escapes to heap"
|
|
}
|
|
|
|
func foo90(x *int) map[*int]*int { // ERROR "leaking param: x"
|
|
return map[*int]*int{nil: x} // ERROR "map\[\*int\]\*int literal escapes to heap"
|
|
}
|
|
|
|
func foo91(x *int) map[*int]*int { // ERROR "leaking param: x"
|
|
return map[*int]*int{x: nil} // ERROR "map\[\*int\]\*int literal escapes to heap"
|
|
}
|
|
|
|
func foo92(x *int) [2]*int { // ERROR "leaking param: x"
|
|
return [2]*int{x, nil}
|
|
}
|
|
|
|
// does not leak c
|
|
func foo93(c chan *int) *int { // ERROR "c does not escape"
|
|
for v := range c {
|
|
return v
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// does not leak m
|
|
func foo94(m map[*int]*int, b bool) *int { // ERROR "m does not escape"
|
|
for k, v := range m {
|
|
if b {
|
|
return k
|
|
}
|
|
return v
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// does leak x
|
|
func foo95(m map[*int]*int, x *int) { // ERROR "m does not escape" "leaking param: x"
|
|
m[x] = x
|
|
}
|
|
|
|
// does not leak m
|
|
func foo96(m []*int) *int { // ERROR "m does not escape"
|
|
return m[0]
|
|
}
|
|
|
|
// does leak m
|
|
func foo97(m [1]*int) *int { // ERROR "leaking param: m"
|
|
return m[0]
|
|
}
|
|
|
|
// does not leak m
|
|
func foo98(m map[int]*int) *int { // ERROR "m does not escape"
|
|
return m[0]
|
|
}
|
|
|
|
// does leak m
|
|
func foo99(m *[1]*int) []*int { // ERROR "leaking param: m"
|
|
return m[:]
|
|
}
|
|
|
|
// does not leak m
|
|
func foo100(m []*int) *int { // ERROR "m does not escape"
|
|
for _, v := range m {
|
|
return v
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// does leak m
|
|
func foo101(m [1]*int) *int { // ERROR "leaking param: m"
|
|
for _, v := range m {
|
|
return v
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// does not leak m
|
|
func foo101a(m [1]*int) *int { // ERROR "m does not escape"
|
|
for i := range m { // ERROR "moved to heap: i"
|
|
return &i // ERROR "&i escapes to heap"
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// does leak x
|
|
func foo102(m []*int, x *int) { // ERROR "m does not escape" "leaking param: x"
|
|
m[0] = x
|
|
}
|
|
|
|
// does not leak x
|
|
func foo103(m [1]*int, x *int) { // ERROR "m does not escape" "x does not escape"
|
|
m[0] = x
|
|
}
|
|
|
|
var y []*int
|
|
|
|
// does not leak x
|
|
func foo104(x []*int) { // ERROR "x does not escape"
|
|
copy(y, x)
|
|
}
|
|
|
|
// does not leak x
|
|
func foo105(x []*int) { // ERROR "x does not escape"
|
|
_ = append(y, x...)
|
|
}
|
|
|
|
// does leak x
|
|
func foo106(x *int) { // ERROR "leaking param: x"
|
|
_ = append(y, x)
|
|
}
|
|
|
|
func foo107(x *int) map[*int]*int { // ERROR "leaking param: x"
|
|
return map[*int]*int{x: nil} // ERROR "map.* literal escapes to heap"
|
|
}
|
|
|
|
func foo108(x *int) map[*int]*int { // ERROR "leaking param: x"
|
|
return map[*int]*int{nil: x} // ERROR "map.* literal escapes to heap"
|
|
}
|
|
|
|
func foo109(x *int) *int { // ERROR "leaking param: x"
|
|
m := map[*int]*int{x: nil} // ERROR "map.* literal does not escape"
|
|
for k, _ := range m {
|
|
return k
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func foo110(x *int) *int { // ERROR "leaking param: x"
|
|
m := map[*int]*int{nil: x} // ERROR "map.* literal does not escape"
|
|
return m[nil]
|
|
}
|
|
|
|
func foo111(x *int) *int { // ERROR "leaking param: x"
|
|
m := []*int{x} // ERROR "\[\]\*int literal does not escape"
|
|
return m[0]
|
|
}
|
|
|
|
func foo112(x *int) *int { // ERROR "leaking param: x"
|
|
m := [1]*int{x}
|
|
return m[0]
|
|
}
|
|
|
|
func foo113(x *int) *int { // ERROR "leaking param: x"
|
|
m := Bar{ii: x}
|
|
return m.ii
|
|
}
|
|
|
|
func foo114(x *int) *int { // ERROR "leaking param: x"
|
|
m := &Bar{ii: x} // ERROR "&Bar literal does not escape"
|
|
return m.ii
|
|
}
|
|
|
|
func foo115(x *int) *int { // ERROR "leaking param: x"
|
|
return (*int)(unsafe.Pointer(uintptr(unsafe.Pointer(x)) + 1))
|
|
}
|
|
|
|
func foo116(b bool) *int {
|
|
if b {
|
|
x := 1 // ERROR "moved to heap: x"
|
|
return &x // ERROR "&x escapes to heap"
|
|
} else {
|
|
y := 1 // ERROR "moved to heap: y"
|
|
return &y // ERROR "&y escapes to heap"
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func foo117(unknown func(interface{})) { // ERROR "unknown does not escape"
|
|
x := 1 // ERROR "moved to heap: x"
|
|
unknown(&x) // ERROR "&x escapes to heap"
|
|
}
|
|
|
|
func foo118(unknown func(*int)) { // ERROR "unknown does not escape"
|
|
x := 1 // ERROR "moved to heap: x"
|
|
unknown(&x) // ERROR "&x escapes to heap"
|
|
}
|
|
|
|
func external(*int)
|
|
|
|
func foo119(x *int) { // ERROR "leaking param: x"
|
|
external(x)
|
|
}
|
|
|
|
func foo120() {
|
|
// formerly exponential time analysis
|
|
L1:
|
|
L2:
|
|
L3:
|
|
L4:
|
|
L5:
|
|
L6:
|
|
L7:
|
|
L8:
|
|
L9:
|
|
L10:
|
|
L11:
|
|
L12:
|
|
L13:
|
|
L14:
|
|
L15:
|
|
L16:
|
|
L17:
|
|
L18:
|
|
L19:
|
|
L20:
|
|
L21:
|
|
L22:
|
|
L23:
|
|
L24:
|
|
L25:
|
|
L26:
|
|
L27:
|
|
L28:
|
|
L29:
|
|
L30:
|
|
L31:
|
|
L32:
|
|
L33:
|
|
L34:
|
|
L35:
|
|
L36:
|
|
L37:
|
|
L38:
|
|
L39:
|
|
L40:
|
|
L41:
|
|
L42:
|
|
L43:
|
|
L44:
|
|
L45:
|
|
L46:
|
|
L47:
|
|
L48:
|
|
L49:
|
|
L50:
|
|
L51:
|
|
L52:
|
|
L53:
|
|
L54:
|
|
L55:
|
|
L56:
|
|
L57:
|
|
L58:
|
|
L59:
|
|
L60:
|
|
L61:
|
|
L62:
|
|
L63:
|
|
L64:
|
|
L65:
|
|
L66:
|
|
L67:
|
|
L68:
|
|
L69:
|
|
L70:
|
|
L71:
|
|
L72:
|
|
L73:
|
|
L74:
|
|
L75:
|
|
L76:
|
|
L77:
|
|
L78:
|
|
L79:
|
|
L80:
|
|
L81:
|
|
L82:
|
|
L83:
|
|
L84:
|
|
L85:
|
|
L86:
|
|
L87:
|
|
L88:
|
|
L89:
|
|
L90:
|
|
L91:
|
|
L92:
|
|
L93:
|
|
L94:
|
|
L95:
|
|
L96:
|
|
L97:
|
|
L98:
|
|
L99:
|
|
L100:
|
|
// use the labels to silence compiler errors
|
|
goto L1
|
|
goto L2
|
|
goto L3
|
|
goto L4
|
|
goto L5
|
|
goto L6
|
|
goto L7
|
|
goto L8
|
|
goto L9
|
|
goto L10
|
|
goto L11
|
|
goto L12
|
|
goto L13
|
|
goto L14
|
|
goto L15
|
|
goto L16
|
|
goto L17
|
|
goto L18
|
|
goto L19
|
|
goto L20
|
|
goto L21
|
|
goto L22
|
|
goto L23
|
|
goto L24
|
|
goto L25
|
|
goto L26
|
|
goto L27
|
|
goto L28
|
|
goto L29
|
|
goto L30
|
|
goto L31
|
|
goto L32
|
|
goto L33
|
|
goto L34
|
|
goto L35
|
|
goto L36
|
|
goto L37
|
|
goto L38
|
|
goto L39
|
|
goto L40
|
|
goto L41
|
|
goto L42
|
|
goto L43
|
|
goto L44
|
|
goto L45
|
|
goto L46
|
|
goto L47
|
|
goto L48
|
|
goto L49
|
|
goto L50
|
|
goto L51
|
|
goto L52
|
|
goto L53
|
|
goto L54
|
|
goto L55
|
|
goto L56
|
|
goto L57
|
|
goto L58
|
|
goto L59
|
|
goto L60
|
|
goto L61
|
|
goto L62
|
|
goto L63
|
|
goto L64
|
|
goto L65
|
|
goto L66
|
|
goto L67
|
|
goto L68
|
|
goto L69
|
|
goto L70
|
|
goto L71
|
|
goto L72
|
|
goto L73
|
|
goto L74
|
|
goto L75
|
|
goto L76
|
|
goto L77
|
|
goto L78
|
|
goto L79
|
|
goto L80
|
|
goto L81
|
|
goto L82
|
|
goto L83
|
|
goto L84
|
|
goto L85
|
|
goto L86
|
|
goto L87
|
|
goto L88
|
|
goto L89
|
|
goto L90
|
|
goto L91
|
|
goto L92
|
|
goto L93
|
|
goto L94
|
|
goto L95
|
|
goto L96
|
|
goto L97
|
|
goto L98
|
|
goto L99
|
|
goto L100
|
|
}
|
|
|
|
func foo121() {
|
|
for i := 0; i < 10; i++ {
|
|
defer myprint(nil, i) // ERROR "[.][.][.] argument escapes to heap"
|
|
go myprint(nil, i) // ERROR "[.][.][.] argument escapes to heap"
|
|
}
|
|
}
|
|
|
|
// same as foo121 but check across import
|
|
func foo121b() {
|
|
for i := 0; i < 10; i++ {
|
|
defer fmt.Printf("%d", i) // ERROR "[.][.][.] argument escapes to heap"
|
|
go fmt.Printf("%d", i) // ERROR "[.][.][.] argument escapes to heap"
|
|
}
|
|
}
|
|
|
|
// a harmless forward jump
|
|
func foo122() {
|
|
var i *int
|
|
|
|
goto L1
|
|
L1:
|
|
i = new(int) // ERROR "new.int. does not escape"
|
|
_ = i
|
|
}
|
|
|
|
// a backward jump, increases loopdepth
|
|
func foo123() {
|
|
var i *int
|
|
|
|
L1:
|
|
i = new(int) // ERROR "new.int. escapes to heap"
|
|
|
|
goto L1
|
|
_ = i
|
|
}
|
|
|
|
func foo124(x **int) { // ERROR "x does not escape"
|
|
var i int // ERROR "moved to heap: i"
|
|
p := &i // ERROR "&i escapes"
|
|
func() { // ERROR "func literal does not escape"
|
|
*x = p // ERROR "leaking closure reference p"
|
|
}()
|
|
}
|
|
|
|
func foo125(ch chan *int) { // ERROR "does not escape"
|
|
var i int // ERROR "moved to heap"
|
|
p := &i // ERROR "&i escapes to heap"
|
|
func() { // ERROR "func literal does not escape"
|
|
ch <- p // ERROR "leaking closure reference p"
|
|
}()
|
|
}
|
|
|
|
func foo126() {
|
|
var px *int // loopdepth 0
|
|
for {
|
|
// loopdepth 1
|
|
var i int // ERROR "moved to heap"
|
|
func() { // ERROR "func literal does not escape"
|
|
px = &i // ERROR "&i escapes"
|
|
}()
|
|
}
|
|
}
|
|
|
|
var px *int
|
|
|
|
func foo127() {
|
|
var i int // ERROR "moved to heap: i"
|
|
p := &i // ERROR "&i escapes to heap"
|
|
q := p
|
|
px = q
|
|
}
|
|
|
|
func foo128() {
|
|
var i int
|
|
p := &i // ERROR "&i does not escape"
|
|
q := p
|
|
_ = q
|
|
}
|
|
|
|
func foo129() {
|
|
var i int // ERROR "moved to heap: i"
|
|
p := &i // ERROR "&i escapes to heap"
|
|
func() { // ERROR "func literal does not escape"
|
|
q := p // ERROR "leaking closure reference p"
|
|
func() { // ERROR "func literal does not escape"
|
|
r := q // ERROR "leaking closure reference q"
|
|
px = r
|
|
}()
|
|
}()
|
|
}
|
|
|
|
func foo130() {
|
|
for {
|
|
var i int // ERROR "moved to heap"
|
|
func() { // ERROR "func literal does not escape"
|
|
px = &i // ERROR "&i escapes" "leaking closure reference i"
|
|
}()
|
|
}
|
|
}
|
|
|
|
func foo131() {
|
|
var i int // ERROR "moved to heap"
|
|
func() { // ERROR "func literal does not escape"
|
|
px = &i // ERROR "&i escapes" "leaking closure reference i"
|
|
}()
|
|
}
|
|
|
|
func foo132() {
|
|
var i int // ERROR "moved to heap"
|
|
go func() { // ERROR "func literal escapes to heap"
|
|
px = &i // ERROR "&i escapes" "leaking closure reference i"
|
|
}()
|
|
}
|
|
|
|
func foo133() {
|
|
var i int // ERROR "moved to heap"
|
|
defer func() { // ERROR "func literal does not escape"
|
|
px = &i // ERROR "&i escapes" "leaking closure reference i"
|
|
}()
|
|
}
|
|
|
|
func foo134() {
|
|
var i int
|
|
p := &i // ERROR "&i does not escape"
|
|
func() { // ERROR "func literal does not escape"
|
|
q := p
|
|
func() { // ERROR "func literal does not escape"
|
|
r := q
|
|
_ = r
|
|
}()
|
|
}()
|
|
}
|
|
|
|
func foo135() {
|
|
var i int // ERROR "moved to heap: i"
|
|
p := &i // ERROR "&i escapes to heap" "moved to heap: p"
|
|
go func() { // ERROR "func literal escapes to heap"
|
|
q := p // ERROR "&p escapes to heap"
|
|
func() { // ERROR "func literal does not escape"
|
|
r := q
|
|
_ = r
|
|
}()
|
|
}()
|
|
}
|
|
|
|
func foo136() {
|
|
var i int // ERROR "moved to heap: i"
|
|
p := &i // ERROR "&i escapes to heap" "moved to heap: p"
|
|
go func() { // ERROR "func literal escapes to heap"
|
|
q := p // ERROR "&p escapes to heap" "leaking closure reference p"
|
|
func() { // ERROR "func literal does not escape"
|
|
r := q // ERROR "leaking closure reference q"
|
|
px = r
|
|
}()
|
|
}()
|
|
}
|
|
|
|
func foo137() {
|
|
var i int // ERROR "moved to heap: i"
|
|
p := &i // ERROR "&i escapes to heap"
|
|
func() { // ERROR "func literal does not escape"
|
|
q := p // ERROR "leaking closure reference p" "moved to heap: q"
|
|
go func() { // ERROR "func literal escapes to heap"
|
|
r := q // ERROR "&q escapes to heap"
|
|
_ = r
|
|
}()
|
|
}()
|
|
}
|
|
|
|
func foo138() *byte {
|
|
type T struct {
|
|
x [1]byte
|
|
}
|
|
t := new(T) // ERROR "new.T. escapes to heap"
|
|
return &t.x[0] // ERROR "&t.x.0. escapes to heap"
|
|
}
|
|
|
|
func foo139() *byte {
|
|
type T struct {
|
|
x struct {
|
|
y byte
|
|
}
|
|
}
|
|
t := new(T) // ERROR "new.T. escapes to heap"
|
|
return &t.x.y // ERROR "&t.x.y escapes to heap"
|
|
}
|
|
|
|
// issue 4751
|
|
func foo140() interface{} {
|
|
type T struct {
|
|
X string
|
|
}
|
|
type U struct {
|
|
X string
|
|
T *T
|
|
}
|
|
t := &T{} // ERROR "&T literal escapes to heap"
|
|
return U{
|
|
X: t.X,
|
|
T: t,
|
|
}
|
|
}
|
|
|
|
//go:noescape
|
|
|
|
func F1([]byte)
|
|
|
|
func F2([]byte)
|
|
|
|
//go:noescape
|
|
|
|
func F3(x []byte) // ERROR "F3 x does not escape"
|
|
|
|
func F4(x []byte)
|
|
|
|
func G() {
|
|
var buf1 [10]byte
|
|
F1(buf1[:]) // ERROR "buf1 does not escape"
|
|
|
|
var buf2 [10]byte // ERROR "moved to heap: buf2"
|
|
F2(buf2[:]) // ERROR "buf2 escapes to heap"
|
|
|
|
var buf3 [10]byte
|
|
F3(buf3[:]) // ERROR "buf3 does not escape"
|
|
|
|
var buf4 [10]byte // ERROR "moved to heap: buf4"
|
|
F4(buf4[:]) // ERROR "buf4 escapes to heap"
|
|
}
|
|
|
|
type Tm struct {
|
|
x int
|
|
}
|
|
|
|
func (t *Tm) M() { // ERROR "t does not escape"
|
|
}
|
|
|
|
func foo141() {
|
|
var f func()
|
|
|
|
t := new(Tm) // ERROR "escapes to heap"
|
|
f = t.M // ERROR "t.M does not escape"
|
|
_ = f
|
|
}
|
|
|
|
var gf func()
|
|
|
|
func foo142() {
|
|
t := new(Tm) // ERROR "escapes to heap"
|
|
gf = t.M // ERROR "t.M escapes to heap"
|
|
}
|
|
|
|
// issue 3888.
|
|
func foo143() {
|
|
for i := 0; i < 1000; i++ {
|
|
func() { // ERROR "func literal does not escape"
|
|
for i := 0; i < 1; i++ {
|
|
var t Tm
|
|
t.M() // ERROR "t does not escape"
|
|
}
|
|
}()
|
|
}
|
|
}
|
|
|
|
// issue 5773
|
|
// Check that annotations take effect regardless of whether they
|
|
// are before or after the use in the source code.
|
|
|
|
//go:noescape
|
|
|
|
func foo144a(*int)
|
|
|
|
func foo144() {
|
|
var x int
|
|
foo144a(&x) // ERROR "&x does not escape"
|
|
var y int
|
|
foo144b(&y) // ERROR "&y does not escape"
|
|
}
|
|
|
|
//go:noescape
|
|
|
|
func foo144b(*int)
|