mirror of
https://github.com/golang/go
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a9831633be
The new escape analysis implementation tries to emit debugging
diagnostics that are compatible with the existing implementation, but
there's a handful of cases that are easier to handle by updating the
test expectations instead.
For regress tests that need updating, the original file is copied to
oldescapeXXX.go.go with -newescape=false added to the //errorcheck
line, while the file is updated in place with -newescape=true and new
test requirements.
Notable test changes:
1) escape_because.go looks for a lot of detailed internal debugging
messages that are fairly particular to how esc.go works and that I
haven't attempted to port over to escape.go yet.
2) There are a lot of "leaking param: x to result ~r1 level=-1"
messages for code like
func(p *int) *T { return &T{p} }
that were simply wrong. Here &T must be heap allocated unconditionally
(because it's being returned); and since p is stored into it, p
escapes unconditionally too. esc.go incorrectly reports that p escapes
conditionally only if the returned pointer escaped.
3) esc.go used to print each "leaking param" analysis result as it
discovered them, which could lead to redundant messages (e.g., that a
param leaks at level=0 and level=1). escape.go instead prints
everything at the end, once it knows the shortest path to each sink.
4) esc.go didn't precisely model direct-interface types, resulting in
some values unnecessarily escaping to the heap when stored into
non-escaping interface values.
5) For functions written in assembly, esc.go only printed "does not
escape" messages, whereas escape.go prints "does not escape" or
"leaking param" as appropriate, consistent with the behavior for
functions written in Go.
6) 12 tests included "BAD" annotations identifying cases where esc.go
was unnecessarily heap allocating something. These are all fixed by
escape.go.
Updates #23109.
Change-Id: Iabc9eb14c94c9cadde3b183478d1fd54f013502f
Reviewed-on: https://go-review.googlesource.com/c/go/+/170447
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
1846 lines
37 KiB
Go
1846 lines
37 KiB
Go
// errorcheck -0 -N -m -l -newescape=true
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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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// Registerization is disabled too (-N), which should
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// have no effect on escape analysis.
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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$"
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gxx = &x
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}
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func foo2(yy *int) { // ERROR "leaking param: yy$"
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gxx = yy
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}
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func foo3(x int) *int { // ERROR "moved to heap: x$"
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return &x
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}
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type T *T
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func foo3b(t T) { // ERROR "leaking param: t$"
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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 "foo4 xx does not escape$" "foo4 yy does not escape$"
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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 "foo5 xx does not escape$" "foo5 yy does not escape$"
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xx = &yy
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}
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func foo6(xx **int, yy *int) { // ERROR "foo6 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 "foo7 xx does not escape$" "foo7 yy does not escape$"
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**xx = *yy
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}
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func foo8(xx, yy *int) int { // ERROR "foo8 xx does not escape$" "foo8 yy does not escape$"
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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 to result ~r2 level=0$" "leaking param: yy to result ~r2 level=0$"
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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 "foo10 xx does not escape$" "foo10 yy does not escape$"
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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
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yy := &y
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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$"
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xxx = yyy
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}
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// Must treat yyy as leaking because *yyy leaks, and the escape analysis
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// summaries in exported metadata do not distinguish these two cases.
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func foo13(yyy **int) { // ERROR "leaking param content: yyy$"
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*xxx = *yyy
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}
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func foo14(yyy **int) { // ERROR "foo14 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
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}
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func foo16(yy *int) { // ERROR "leaking param: yy$"
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*xxx = yy
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}
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func foo17(yy *int) { // ERROR "foo17 yy does not escape$"
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**xxx = *yy
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}
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func foo18(y int) { // ERROR "moved to heap: y$"
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*xxx = &y
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}
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func foo19(y int) {
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**xxx = y
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}
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type Bar struct {
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i int
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ii *int
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}
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func NewBar() *Bar {
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return &Bar{42, nil} // ERROR "&Bar literal escapes to heap$"
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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 "NewBarp2 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 "\(\*Bar\).NoLeak b does not escape$"
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return *(b.ii)
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}
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func (b *Bar) Leak() *int { // ERROR "leaking param: b to result ~r0 level=0$"
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return &b.i
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}
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func (b *Bar) AlsoNoLeak() *int { // ERROR "leaking param: b to result ~r0 level=1$"
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return b.ii
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}
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func (b Bar) AlsoLeak() *int { // ERROR "leaking param: b to result ~r0 level=0$"
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return b.ii
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}
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func (b Bar) LeaksToo() *int { // ERROR "leaking param: b to result ~r0 level=0$"
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v := 0 // ERROR "moved to heap: v$"
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b.ii = &v
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return b.ii
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}
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func (b *Bar) LeaksABit() *int { // ERROR "leaking param: b to result ~r0 level=1$"
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v := 0 // ERROR "moved to heap: v$"
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b.ii = &v
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return b.ii
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}
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func (b Bar) StillNoLeak() int { // ERROR "Bar.StillNoLeak b does not escape$"
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v := 0
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b.ii = &v
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return b.i
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}
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func goLeak(b *Bar) { // ERROR "leaking param: b$"
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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 "\(\*Bar2\).NoLeak b does not escape$"
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return b.i[0]
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}
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func (b *Bar2) Leak() []int { // ERROR "leaking param: b to result ~r0 level=0$"
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return b.i[:]
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}
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func (b *Bar2) AlsoNoLeak() []int { // ERROR "leaking param: b to result ~r0 level=1$"
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return b.ii[0:1]
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}
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func (b Bar2) AgainNoLeak() [12]int { // ERROR "Bar2.AgainNoLeak b does not escape$"
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return b.i
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}
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func (b *Bar2) LeakSelf() { // ERROR "leaking param: b$"
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b.ii = b.i[0:4]
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}
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func (b *Bar2) LeakSelf2() { // ERROR "leaking param: b$"
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var buf []int
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buf = b.i[0:]
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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
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return func() int { // ERROR "func literal escapes to heap$"
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return x
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}
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}
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func foo21a() func() int {
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x := 42 // ERROR "moved to heap: x$"
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return func() int { // ERROR "func literal escapes to heap$"
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x++
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return x
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}
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}
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func foo22() int {
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x := 42
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return func() int { // ERROR "foo22 func literal does not escape$"
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return x
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}()
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}
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func foo23(x int) func() int {
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return func() int { // ERROR "func literal escapes to heap$"
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return x
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}
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}
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func foo23a(x int) func() int {
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f := func() int { // ERROR "func literal escapes to heap$"
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return x
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}
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return f
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}
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func foo23b(x int) *(func() int) {
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f := func() int { return x } // ERROR "func literal escapes to heap$" "moved to heap: f$"
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return &f
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}
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func foo23c(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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x++
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return x
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}
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}
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func foo24(x int) int {
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return func() int { // ERROR "foo24 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 "foonoleak 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)
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}
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func foo32(x int) int {
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return foonoleak(&x)
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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 "\(\*Foo\).foonoleak 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 "\(\*Foo\).NoLeak 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
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}
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func (f *Foo) foo42(x int) { // ERROR "\(\*Foo\).foo42 f does not escape$" "moved to heap: x$"
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f.xx = &x
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}
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func foo43(f *Foo, x int) { // ERROR "foo43 f does not escape$" "moved to heap: x$"
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f.xx = &x
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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 "\(\*Foo\).foo45 f does not escape$"
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F.x = f.x
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}
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// See foo13 above for explanation of why f leaks.
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func (f *Foo) foo46() { // ERROR "leaking param content: f$"
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F.xx = f.xx
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}
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func (f *Foo) foo47() { // ERROR "leaking param: f$"
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f.xx = &f.x
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}
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var ptrSlice []*int
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func foo50(i *int) { // ERROR "leaking param: i$"
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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
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}
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func indaddr2(x *int) *int { // ERROR "leaking param: x to result ~r1 level=0$"
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return *&x
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}
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func indaddr3(x *int32) *int { // ERROR "leaking param: x to result ~r1 level=0$"
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return *(**int)(unsafe.Pointer(&x))
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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))
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}
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func Float32frombits(b uint32) float32 {
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return *(*float32)(unsafe.Pointer(&b))
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}
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func Float64bits(f float64) uint64 {
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return *(*uint64)(unsafe.Pointer(&f))
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}
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func Float64frombits(b uint64) float64 {
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return *(*float64)(unsafe.Pointer(&b))
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}
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// contrast with
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func float64bitsptr(f float64) *uint64 { // ERROR "moved to heap: f$"
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return (*uint64)(unsafe.Pointer(&f))
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}
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func float64ptrbitsptr(f *float64) *uint64 { // ERROR "leaking param: f to result ~r1 level=0$"
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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 to result ~r1 level=0$"
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switch val := i.(type) {
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case *int:
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return val
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case *int8:
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v := int(*val) // ERROR "moved to heap: v$"
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return &v
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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 to result ~r1 level=0$"
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switch j := i; *j + 110 {
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case 12:
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return j
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case 42:
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return nil
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}
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return nil
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}
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// assigning to an array element is like assigning to the array
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func foo60(i *int) *int { // ERROR "leaking param: i to result ~r1 level=0$"
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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 "foo60a i does not escape$"
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var a [12]*int
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a[0] = i
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return nil
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}
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// assigning to a struct field is like assigning to the struct
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func foo61(i *int) *int { // ERROR "leaking param: i to result ~r1 level=0$"
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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 "foo61a 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 "foo62 new\(S\) does not escape$"
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s.a = i
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return nil // s.b
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}
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type M interface {
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M()
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}
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func foo63(m M) { // ERROR "foo63 m does not escape$"
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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 "foo65 &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$"
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}
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func foo67() {
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var mv MV
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foo63(mv) // ERROR "foo67 mv does not escape$"
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}
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func foo68() {
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var mv MV
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// escapes but it's an int so irrelevant
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foo64(mv) // ERROR "mv escapes to heap$"
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}
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func foo69(m M) { // ERROR "leaking param: m$"
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foo64(m)
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}
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func foo70(mv1 *MV, m M) { // ERROR "leaking param: m$" "leaking param: mv1$"
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m = mv1 // ERROR "mv1 escapes to heap$"
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foo64(m)
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}
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func foo71(x *int) []*int { // ERROR "leaking param: x$"
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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$"
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var y []*int
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y = append(y, &x)
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return y
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}
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func foo72() {
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var x int
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var y [1]*int
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y[0] = &x
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}
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func foo72aa() [10]*int {
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var x int // ERROR "moved to heap: x$"
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var y [10]*int
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y[0] = &x
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return y
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}
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func foo72a() {
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var y [10]*int
|
|
for i := 0; i < 10; i++ {
|
|
// escapes its scope
|
|
x := i // ERROR "moved to heap: x$"
|
|
y[i] = &x
|
|
}
|
|
return
|
|
}
|
|
|
|
func foo72b() [10]*int {
|
|
var y [10]*int
|
|
for i := 0; i < 10; i++ {
|
|
x := i // ERROR "moved to heap: x$"
|
|
y[i] = &x
|
|
}
|
|
return y
|
|
}
|
|
|
|
// issue 2145
|
|
func foo73() {
|
|
s := []int{3, 2, 1} // ERROR "foo73 \[\]int literal does not escape$"
|
|
for _, v := range s {
|
|
vv := v
|
|
// actually just escapes its scope
|
|
defer func() { // ERROR "func literal escapes to heap$"
|
|
println(vv)
|
|
}()
|
|
}
|
|
}
|
|
|
|
func foo731() {
|
|
s := []int{3, 2, 1} // ERROR "foo731 \[\]int literal does not escape$"
|
|
for _, v := range s {
|
|
vv := v // ERROR "moved to heap: vv$"
|
|
// actually just escapes its scope
|
|
defer func() { // ERROR "func literal escapes to heap$"
|
|
vv = 42
|
|
println(vv)
|
|
}()
|
|
}
|
|
}
|
|
|
|
func foo74() {
|
|
s := []int{3, 2, 1} // ERROR "foo74 \[\]int literal does not escape$"
|
|
for _, v := range s {
|
|
vv := v
|
|
// actually just escapes its scope
|
|
fn := func() { // ERROR "func literal escapes to heap$"
|
|
println(vv)
|
|
}
|
|
defer fn()
|
|
}
|
|
}
|
|
|
|
func foo74a() {
|
|
s := []int{3, 2, 1} // ERROR "foo74a \[\]int literal does not escape$"
|
|
for _, v := range s {
|
|
vv := v // ERROR "moved to heap: vv$"
|
|
// actually just escapes its scope
|
|
fn := func() { // ERROR "func literal escapes to heap$"
|
|
vv += 1
|
|
println(vv)
|
|
}
|
|
defer fn()
|
|
}
|
|
}
|
|
|
|
// issue 3975
|
|
func foo74b() {
|
|
var array [3]func()
|
|
s := []int{3, 2, 1} // ERROR "foo74b \[\]int literal does not escape$"
|
|
for i, v := range s {
|
|
vv := v
|
|
// actually just escapes its scope
|
|
array[i] = func() { // ERROR "func literal escapes to heap$"
|
|
println(vv)
|
|
}
|
|
}
|
|
}
|
|
|
|
func foo74c() {
|
|
var array [3]func()
|
|
s := []int{3, 2, 1} // ERROR "foo74c \[\]int literal does not escape$"
|
|
for i, v := range s {
|
|
vv := v // ERROR "moved to heap: vv$"
|
|
// actually just escapes its scope
|
|
array[i] = func() { // ERROR "func literal escapes to heap$"
|
|
println(&vv)
|
|
}
|
|
}
|
|
}
|
|
|
|
func myprint(y *int, x ...interface{}) *int { // ERROR "leaking param: y to result ~r2 level=0$" "myprint x does not escape$"
|
|
return y
|
|
}
|
|
|
|
func myprint1(y *int, x ...interface{}) *interface{} { // ERROR "leaking param: x to result ~r2 level=0$" "myprint1 y does not escape$"
|
|
return &x[0]
|
|
}
|
|
|
|
func foo75(z *int) { // ERROR "foo75 z does not escape$"
|
|
myprint(z, 1, 2, 3) // ERROR "1 does not escape" "2 does not escape" "3 does not escape" "foo75 ... argument does not escape$"
|
|
}
|
|
|
|
func foo75a(z *int) { // ERROR "foo75a z does not escape$"
|
|
myprint1(z, 1, 2, 3) // ERROR "1 does not escape" "2 does not escape" "3 does not escape" "foo75a ... argument does not escape$"
|
|
}
|
|
|
|
func foo75esc(z *int) { // ERROR "leaking param: z$"
|
|
gxx = myprint(z, 1, 2, 3) // ERROR "1 does not escape" "2 does not escape" "3 does not escape" "foo75esc ... argument does not escape$"
|
|
}
|
|
|
|
func foo75aesc(z *int) { // ERROR "foo75aesc z does not escape$"
|
|
var ppi **interface{} // assignments to pointer dereferences lose track
|
|
*ppi = myprint1(z, 1, 2, 3) // ERROR "... argument escapes to heap$" "1 escapes to heap$" "2 escapes to heap$" "3 escapes to heap$"
|
|
}
|
|
|
|
func foo75aesc1(z *int) { // ERROR "foo75aesc1 z does not escape$"
|
|
sink = myprint1(z, 1, 2, 3) // ERROR "... argument escapes to heap$" "1 escapes to heap$" "2 escapes to heap$" "3 escapes to heap$" "myprint1\(z, 1, 2, 3\) escapes to heap$"
|
|
}
|
|
|
|
func foo76(z *int) { // ERROR "z does not escape"
|
|
myprint(nil, z) // ERROR "foo76 ... argument does not escape$" "z does not escape"
|
|
}
|
|
|
|
func foo76a(z *int) { // ERROR "z does not escape"
|
|
myprint1(nil, z) // ERROR "foo76a ... argument does not escape$" "z does not escape"
|
|
}
|
|
|
|
func foo76b() {
|
|
myprint(nil, 1, 2, 3) // ERROR "1 does not escape" "2 does not escape" "3 does not escape" "foo76b ... argument does not escape$"
|
|
}
|
|
|
|
func foo76c() {
|
|
myprint1(nil, 1, 2, 3) // ERROR "1 does not escape" "2 does not escape" "3 does not escape" "foo76c ... argument does not escape$"
|
|
}
|
|
|
|
func foo76d() {
|
|
defer myprint(nil, 1, 2, 3) // ERROR "1 does not escape" "2 does not escape" "3 does not escape" "foo76d ... argument does not escape$"
|
|
}
|
|
|
|
func foo76e() {
|
|
defer myprint1(nil, 1, 2, 3) // ERROR "1 does not escape" "2 does not escape" "3 does not escape" "foo76e ... argument does not escape$"
|
|
}
|
|
|
|
func foo76f() {
|
|
for {
|
|
// TODO: This one really only escapes its scope, but we don't distinguish yet.
|
|
defer myprint(nil, 1, 2, 3) // ERROR "... argument escapes to heap$" "1 escapes to heap$" "2 escapes to heap$" "3 escapes to heap$"
|
|
}
|
|
}
|
|
|
|
func foo76g() {
|
|
for {
|
|
defer myprint1(nil, 1, 2, 3) // ERROR "... argument escapes to heap$" "1 escapes to heap$" "2 escapes to heap$" "3 escapes to heap$"
|
|
}
|
|
}
|
|
|
|
func foo77(z []interface{}) { // ERROR "foo77 z does not escape$"
|
|
myprint(nil, z...) // z does not escape
|
|
}
|
|
|
|
func foo77a(z []interface{}) { // ERROR "foo77a z does not escape$"
|
|
myprint1(nil, z...)
|
|
}
|
|
|
|
func foo77b(z []interface{}) { // ERROR "leaking param: z$"
|
|
var ppi **interface{}
|
|
*ppi = myprint1(nil, z...)
|
|
}
|
|
|
|
func foo77c(z []interface{}) { // ERROR "leaking param: z$"
|
|
sink = myprint1(nil, z...) // ERROR "myprint1\(nil, z...\) escapes to heap$"
|
|
}
|
|
|
|
func dotdotdot() {
|
|
i := 0
|
|
myprint(nil, &i) // ERROR "&i does not escape" "dotdotdot ... argument does not escape$"
|
|
|
|
j := 0
|
|
myprint1(nil, &j) // ERROR "&j does not escape" "dotdotdot ... argument does not escape$"
|
|
}
|
|
|
|
func foo78(z int) *int { // ERROR "moved to heap: z$"
|
|
return &z
|
|
}
|
|
|
|
func foo78a(z int) *int { // ERROR "moved to heap: z$"
|
|
y := &z
|
|
x := &y
|
|
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 "foo81 new\(int\) does not escape$"
|
|
_ = z
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func tee(p *int) (x, y *int) { return p, p } // ERROR "leaking param: p to result x level=0$" "leaking param: p to result y level=0$"
|
|
|
|
func noop(x, y *int) {} // ERROR "noop x does not escape$" "noop y does not escape$"
|
|
|
|
func foo82() {
|
|
var x, y, z int // ERROR "moved to heap: x$" "moved to heap: y$" "moved to heap: z$"
|
|
go noop(tee(&z))
|
|
go noop(&x, &y)
|
|
for {
|
|
var u, v, w int // ERROR "moved to heap: u$" "moved to heap: v$" "moved to heap: w$"
|
|
defer noop(tee(&u))
|
|
defer noop(&v, &w)
|
|
}
|
|
}
|
|
|
|
type Fooer interface {
|
|
Foo()
|
|
}
|
|
|
|
type LimitedFooer struct {
|
|
Fooer
|
|
N int64
|
|
}
|
|
|
|
func LimitFooer(r Fooer, n int64) Fooer { // ERROR "leaking param: r$"
|
|
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$"
|
|
}
|
|
|
|
func foo92(x *int) [2]*int { // ERROR "leaking param: x to result ~r1 level=0$"
|
|
return [2]*int{x, nil}
|
|
}
|
|
|
|
// does not leak c
|
|
func foo93(c chan *int) *int { // ERROR "foo93 c does not escape$"
|
|
for v := range c {
|
|
return v
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// does not leak m
|
|
func foo94(m map[*int]*int, b bool) *int { // ERROR "leaking param: m to result ~r2 level=1"
|
|
for k, v := range m {
|
|
if b {
|
|
return k
|
|
}
|
|
return v
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// does leak x
|
|
func foo95(m map[*int]*int, x *int) { // ERROR "foo95 m does not escape$" "leaking param: x$"
|
|
m[x] = x
|
|
}
|
|
|
|
// does not leak m but does leak content
|
|
func foo96(m []*int) *int { // ERROR "leaking param: m to result ~r1 level=1"
|
|
return m[0]
|
|
}
|
|
|
|
// does leak m
|
|
func foo97(m [1]*int) *int { // ERROR "leaking param: m to result ~r1 level=0$"
|
|
return m[0]
|
|
}
|
|
|
|
// does not leak m
|
|
func foo98(m map[int]*int) *int { // ERROR "foo98 m does not escape$"
|
|
return m[0]
|
|
}
|
|
|
|
// does leak m
|
|
func foo99(m *[1]*int) []*int { // ERROR "leaking param: m to result ~r1 level=0$"
|
|
return m[:]
|
|
}
|
|
|
|
// does not leak m
|
|
func foo100(m []*int) *int { // ERROR "leaking param: m to result ~r1 level=1"
|
|
for _, v := range m {
|
|
return v
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// does leak m
|
|
func foo101(m [1]*int) *int { // ERROR "leaking param: m to result ~r1 level=0$"
|
|
for _, v := range m {
|
|
return v
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// does not leak m
|
|
func foo101a(m [1]*int) *int { // ERROR "foo101a m does not escape$"
|
|
for i := range m { // ERROR "moved to heap: i$"
|
|
return &i
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// does leak x
|
|
func foo102(m []*int, x *int) { // ERROR "foo102 m does not escape$" "leaking param: x$"
|
|
m[0] = x
|
|
}
|
|
|
|
// does not leak x
|
|
func foo103(m [1]*int, x *int) { // ERROR "foo103 m does not escape$" "foo103 x does not escape$"
|
|
m[0] = x
|
|
}
|
|
|
|
var y []*int
|
|
|
|
// does not leak x but does leak content
|
|
func foo104(x []*int) { // ERROR "leaking param content: x"
|
|
copy(y, x)
|
|
}
|
|
|
|
// does not leak x but does leak content
|
|
func foo105(x []*int) { // ERROR "leaking param content: x"
|
|
_ = append(y, x...)
|
|
}
|
|
|
|
// does leak x
|
|
func foo106(x *int) { // ERROR "leaking param: x$"
|
|
_ = append(y, x)
|
|
}
|
|
|
|
func foo107(x *int) map[*int]*int { // ERROR "leaking param: x$"
|
|
return map[*int]*int{x: nil} // ERROR "map\[\*int\]\*int literal escapes to heap$"
|
|
}
|
|
|
|
func foo108(x *int) map[*int]*int { // ERROR "leaking param: x$"
|
|
return map[*int]*int{nil: x} // ERROR "map\[\*int\]\*int literal escapes to heap$"
|
|
}
|
|
|
|
func foo109(x *int) *int { // ERROR "leaking param: x$"
|
|
m := map[*int]*int{x: nil} // ERROR "foo109 map\[\*int\]\*int 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 "foo110 map\[\*int\]\*int literal does not escape$"
|
|
return m[nil]
|
|
}
|
|
|
|
func foo111(x *int) *int { // ERROR "leaking param: x to result ~r1 level=0"
|
|
m := []*int{x} // ERROR "foo111 \[\]\*int literal does not escape$"
|
|
return m[0]
|
|
}
|
|
|
|
func foo112(x *int) *int { // ERROR "leaking param: x to result ~r1 level=0$"
|
|
m := [1]*int{x}
|
|
return m[0]
|
|
}
|
|
|
|
func foo113(x *int) *int { // ERROR "leaking param: x to result ~r1 level=0$"
|
|
m := Bar{ii: x}
|
|
return m.ii
|
|
}
|
|
|
|
func foo114(x *int) *int { // ERROR "leaking param: x to result ~r1 level=0$"
|
|
m := &Bar{ii: x} // ERROR "foo114 &Bar literal does not escape$"
|
|
return m.ii
|
|
}
|
|
|
|
func foo115(x *int) *int { // ERROR "leaking param: x to result ~r1 level=0$"
|
|
return (*int)(unsafe.Pointer(uintptr(unsafe.Pointer(x)) + 1))
|
|
}
|
|
|
|
func foo116(b bool) *int {
|
|
if b {
|
|
x := 1 // ERROR "moved to heap: x$"
|
|
return &x
|
|
} else {
|
|
y := 1 // ERROR "moved to heap: y$"
|
|
return &y
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func foo117(unknown func(interface{})) { // ERROR "foo117 unknown does not escape$"
|
|
x := 1 // ERROR "moved to heap: x$"
|
|
unknown(&x) // ERROR "&x escapes to heap$"
|
|
}
|
|
|
|
func foo118(unknown func(*int)) { // ERROR "foo118 unknown does not escape$"
|
|
x := 1 // ERROR "moved to heap: x$"
|
|
unknown(&x)
|
|
}
|
|
|
|
func external(*int)
|
|
|
|
func foo119(x *int) { // ERROR "leaking param: x$"
|
|
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$" "i escapes to heap$"
|
|
go myprint(nil, i) // ERROR "... argument escapes to heap$" "i escapes to heap$"
|
|
}
|
|
}
|
|
|
|
// 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$" "i escapes to heap$"
|
|
go fmt.Printf("%d", i) // ERROR "... argument escapes to heap$" "i escapes to heap$"
|
|
}
|
|
}
|
|
|
|
// a harmless forward jump
|
|
func foo122() {
|
|
var i *int
|
|
|
|
goto L1
|
|
L1:
|
|
i = new(int) // ERROR "foo122 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$"
|
|
|
|
goto L1
|
|
_ = i
|
|
}
|
|
|
|
func foo124(x **int) { // ERROR "foo124 x does not escape$"
|
|
var i int // ERROR "moved to heap: i$"
|
|
p := &i
|
|
func() { // ERROR "foo124 func literal does not escape$"
|
|
*x = p
|
|
}()
|
|
}
|
|
|
|
func foo125(ch chan *int) { // ERROR "foo125 ch does not escape$"
|
|
var i int // ERROR "moved to heap: i$"
|
|
p := &i
|
|
func() { // ERROR "foo125 func literal does not escape$"
|
|
ch <- p
|
|
}()
|
|
}
|
|
|
|
func foo126() {
|
|
var px *int // loopdepth 0
|
|
for {
|
|
// loopdepth 1
|
|
var i int // ERROR "moved to heap: i$"
|
|
func() { // ERROR "foo126 func literal does not escape$"
|
|
px = &i
|
|
}()
|
|
}
|
|
_ = px
|
|
}
|
|
|
|
var px *int
|
|
|
|
func foo127() {
|
|
var i int // ERROR "moved to heap: i$"
|
|
p := &i
|
|
q := p
|
|
px = q
|
|
}
|
|
|
|
func foo128() {
|
|
var i int
|
|
p := &i
|
|
q := p
|
|
_ = q
|
|
}
|
|
|
|
func foo129() {
|
|
var i int // ERROR "moved to heap: i$"
|
|
p := &i
|
|
func() { // ERROR "foo129 func literal does not escape$"
|
|
q := p
|
|
func() { // ERROR "foo129.func1 func literal does not escape$"
|
|
r := q
|
|
px = r
|
|
}()
|
|
}()
|
|
}
|
|
|
|
func foo130() {
|
|
for {
|
|
var i int // ERROR "moved to heap: i$"
|
|
func() { // ERROR "foo130 func literal does not escape$"
|
|
px = &i
|
|
}()
|
|
}
|
|
}
|
|
|
|
func foo131() {
|
|
var i int // ERROR "moved to heap: i$"
|
|
func() { // ERROR "foo131 func literal does not escape$"
|
|
px = &i
|
|
}()
|
|
}
|
|
|
|
func foo132() {
|
|
var i int // ERROR "moved to heap: i$"
|
|
go func() { // ERROR "func literal escapes to heap$"
|
|
px = &i
|
|
}()
|
|
}
|
|
|
|
func foo133() {
|
|
var i int // ERROR "moved to heap: i$"
|
|
defer func() { // ERROR "foo133 func literal does not escape$"
|
|
px = &i
|
|
}()
|
|
}
|
|
|
|
func foo134() {
|
|
var i int
|
|
p := &i
|
|
func() { // ERROR "foo134 func literal does not escape$"
|
|
q := p
|
|
func() { // ERROR "foo134.func1 func literal does not escape$"
|
|
r := q
|
|
_ = r
|
|
}()
|
|
}()
|
|
}
|
|
|
|
func foo135() {
|
|
var i int // ERROR "moved to heap: i$"
|
|
p := &i
|
|
go func() { // ERROR "func literal escapes to heap$"
|
|
q := p
|
|
func() { // ERROR "foo135.func1 func literal does not escape$"
|
|
r := q
|
|
_ = r
|
|
}()
|
|
}()
|
|
}
|
|
|
|
func foo136() {
|
|
var i int // ERROR "moved to heap: i$"
|
|
p := &i
|
|
go func() { // ERROR "func literal escapes to heap$"
|
|
q := p
|
|
func() { // ERROR "foo136.func1 func literal does not escape$"
|
|
r := q
|
|
px = r
|
|
}()
|
|
}()
|
|
}
|
|
|
|
func foo137() {
|
|
var i int // ERROR "moved to heap: i$"
|
|
p := &i
|
|
func() { // ERROR "foo137 func literal does not escape$"
|
|
q := p
|
|
go func() { // ERROR "func literal escapes to heap$"
|
|
r := q
|
|
_ = r
|
|
}()
|
|
}()
|
|
}
|
|
|
|
func foo138() *byte {
|
|
type T struct {
|
|
x [1]byte
|
|
}
|
|
t := new(T) // ERROR "new\(T\) escapes to heap$"
|
|
return &t.x[0]
|
|
}
|
|
|
|
func foo139() *byte {
|
|
type T struct {
|
|
x struct {
|
|
y byte
|
|
}
|
|
}
|
|
t := new(T) // ERROR "new\(T\) escapes to heap$"
|
|
return &t.x.y
|
|
}
|
|
|
|
// issue 4751
|
|
func foo140() interface{} {
|
|
type T struct {
|
|
X string
|
|
}
|
|
type U struct {
|
|
X string
|
|
T *T
|
|
}
|
|
t := &T{} // ERROR "&T literal escapes to heap$"
|
|
return U{ // ERROR "U literal escapes to heap$"
|
|
X: t.X,
|
|
T: t,
|
|
}
|
|
}
|
|
|
|
//go:noescape
|
|
|
|
func F1([]byte)
|
|
|
|
func F2([]byte)
|
|
|
|
//go:noescape
|
|
|
|
func F3(x []byte) // ERROR "F3 x does not escape$"
|
|
|
|
func F4(x []byte) // ERROR "leaking param: x$"
|
|
|
|
func G() {
|
|
var buf1 [10]byte
|
|
F1(buf1[:])
|
|
|
|
var buf2 [10]byte // ERROR "moved to heap: buf2$"
|
|
F2(buf2[:])
|
|
|
|
var buf3 [10]byte
|
|
F3(buf3[:])
|
|
|
|
var buf4 [10]byte // ERROR "moved to heap: buf4$"
|
|
F4(buf4[:])
|
|
}
|
|
|
|
type Tm struct {
|
|
x int
|
|
}
|
|
|
|
func (t *Tm) M() { // ERROR "\(\*Tm\).M t does not escape$"
|
|
}
|
|
|
|
func foo141() {
|
|
var f func()
|
|
|
|
t := new(Tm) // ERROR "new\(Tm\) escapes to heap$"
|
|
f = t.M // ERROR "foo141 t.M does not escape$"
|
|
_ = f
|
|
}
|
|
|
|
var gf func()
|
|
|
|
func foo142() {
|
|
t := new(Tm) // ERROR "new\(Tm\) escapes to heap$"
|
|
gf = t.M // ERROR "t.M escapes to heap$"
|
|
}
|
|
|
|
// issue 3888.
|
|
func foo143() {
|
|
for i := 0; i < 1000; i++ {
|
|
func() { // ERROR "foo143 func literal does not escape$"
|
|
for i := 0; i < 1; i++ {
|
|
var t Tm
|
|
t.M()
|
|
}
|
|
}()
|
|
}
|
|
}
|
|
|
|
// issue 5773
|
|
// Check that annotations take effect regardless of whether they
|
|
// are before or after the use in the source code.
|
|
|
|
//go:noescape
|
|
|
|
func foo144a(*int)
|
|
|
|
func foo144() {
|
|
var x int
|
|
foo144a(&x)
|
|
var y int
|
|
foo144b(&y)
|
|
}
|
|
|
|
//go:noescape
|
|
|
|
func foo144b(*int)
|
|
|
|
// issue 7313: for loop init should not be treated as "in loop"
|
|
|
|
type List struct {
|
|
Next *List
|
|
}
|
|
|
|
func foo145(l List) { // ERROR "foo145 l does not escape$"
|
|
var p *List
|
|
for p = &l; p.Next != nil; p = p.Next {
|
|
}
|
|
}
|
|
|
|
func foo146(l List) { // ERROR "foo146 l does not escape$"
|
|
var p *List
|
|
p = &l
|
|
for ; p.Next != nil; p = p.Next {
|
|
}
|
|
}
|
|
|
|
func foo147(l List) { // ERROR "foo147 l does not escape$"
|
|
var p *List
|
|
p = &l
|
|
for p.Next != nil {
|
|
p = p.Next
|
|
}
|
|
}
|
|
|
|
func foo148(l List) { // ERROR "foo148 l does not escape$"
|
|
for p := &l; p.Next != nil; p = p.Next {
|
|
}
|
|
}
|
|
|
|
// related: address of variable should have depth of variable, not of loop
|
|
|
|
func foo149(l List) { // ERROR "foo149 l does not escape$"
|
|
var p *List
|
|
for {
|
|
for p = &l; p.Next != nil; p = p.Next {
|
|
}
|
|
}
|
|
}
|
|
|
|
// issue 7934: missed ... if element type had no pointers
|
|
|
|
var save150 []byte
|
|
|
|
func foo150(x ...byte) { // ERROR "leaking param: x$"
|
|
save150 = x
|
|
}
|
|
|
|
func bar150() {
|
|
foo150(1, 2, 3) // ERROR "... argument escapes to heap$"
|
|
}
|
|
|
|
// issue 7931: bad handling of slice of array
|
|
|
|
var save151 *int
|
|
|
|
func foo151(x *int) { // ERROR "leaking param: x$"
|
|
save151 = x
|
|
}
|
|
|
|
func bar151() {
|
|
var a [64]int // ERROR "moved to heap: a$"
|
|
a[4] = 101
|
|
foo151(&(&a)[4:8][0])
|
|
}
|
|
|
|
func bar151b() {
|
|
var a [10]int // ERROR "moved to heap: a$"
|
|
b := a[:]
|
|
foo151(&b[4:8][0])
|
|
}
|
|
|
|
func bar151c() {
|
|
var a [64]int // ERROR "moved to heap: a$"
|
|
a[4] = 101
|
|
foo151(&(&a)[4:8:8][0])
|
|
}
|
|
|
|
func bar151d() {
|
|
var a [10]int // ERROR "moved to heap: a$"
|
|
b := a[:]
|
|
foo151(&b[4:8:8][0])
|
|
}
|
|
|
|
// issue 8120
|
|
|
|
type U struct {
|
|
s *string
|
|
}
|
|
|
|
func (u *U) String() *string { // ERROR "leaking param: u to result ~r0 level=1$"
|
|
return u.s
|
|
}
|
|
|
|
type V struct {
|
|
s *string
|
|
}
|
|
|
|
func NewV(u U) *V { // ERROR "leaking param: u$"
|
|
return &V{u.String()} // ERROR "&V literal escapes to heap$"
|
|
}
|
|
|
|
func foo152() {
|
|
a := "a" // ERROR "moved to heap: a$"
|
|
u := U{&a}
|
|
v := NewV(u)
|
|
println(v)
|
|
}
|
|
|
|
// issue 8176 - &x in type switch body not marked as escaping
|
|
|
|
func foo153(v interface{}) *int { // ERROR "foo153 v does not escape"
|
|
switch x := v.(type) {
|
|
case int: // ERROR "moved to heap: x$"
|
|
return &x
|
|
}
|
|
panic(0)
|
|
}
|
|
|
|
// issue 8185 - &result escaping into result
|
|
|
|
func f() (x int, y *int) { // ERROR "moved to heap: x$"
|
|
y = &x
|
|
return
|
|
}
|
|
|
|
func g() (x interface{}) { // ERROR "moved to heap: x$"
|
|
x = &x // ERROR "&x escapes to heap$"
|
|
return
|
|
}
|
|
|
|
var sink interface{}
|
|
|
|
type Lit struct {
|
|
p *int
|
|
}
|
|
|
|
func ptrlitNoescape() {
|
|
// Both literal and element do not escape.
|
|
i := 0
|
|
x := &Lit{&i} // ERROR "ptrlitNoescape &Lit literal does not escape$"
|
|
_ = x
|
|
}
|
|
|
|
func ptrlitNoEscape2() {
|
|
// Literal does not escape, but element does.
|
|
i := 0 // ERROR "moved to heap: i$"
|
|
x := &Lit{&i} // ERROR "ptrlitNoEscape2 &Lit literal does not escape$"
|
|
sink = *x // ERROR "\*x escapes to heap$"
|
|
}
|
|
|
|
func ptrlitEscape() {
|
|
// Both literal and element escape.
|
|
i := 0 // ERROR "moved to heap: i$"
|
|
x := &Lit{&i} // ERROR "&Lit literal escapes to heap$"
|
|
sink = x // ERROR "x escapes to heap$"
|
|
}
|
|
|
|
// self-assignments
|
|
|
|
type Buffer struct {
|
|
arr [64]byte
|
|
arrPtr *[64]byte
|
|
buf1 []byte
|
|
buf2 []byte
|
|
str1 string
|
|
str2 string
|
|
}
|
|
|
|
func (b *Buffer) foo() { // ERROR "\(\*Buffer\).foo b does not escape$"
|
|
b.buf1 = b.buf1[1:2] // ERROR "\(\*Buffer\).foo ignoring self-assignment in b.buf1 = b.buf1\[1:2\]$"
|
|
b.buf1 = b.buf1[1:2:3] // ERROR "\(\*Buffer\).foo ignoring self-assignment in b.buf1 = b.buf1\[1:2:3\]$"
|
|
b.buf1 = b.buf2[1:2] // ERROR "\(\*Buffer\).foo ignoring self-assignment in b.buf1 = b.buf2\[1:2\]$"
|
|
b.buf1 = b.buf2[1:2:3] // ERROR "\(\*Buffer\).foo ignoring self-assignment in b.buf1 = b.buf2\[1:2:3\]$"
|
|
}
|
|
|
|
func (b *Buffer) bar() { // ERROR "leaking param: b$"
|
|
b.buf1 = b.arr[1:2]
|
|
}
|
|
|
|
func (b *Buffer) arrayPtr() { // ERROR "\(\*Buffer\).arrayPtr b does not escape"
|
|
b.buf1 = b.arrPtr[1:2] // ERROR "\(\*Buffer\).arrayPtr ignoring self-assignment in b.buf1 = b.arrPtr\[1:2\]$"
|
|
b.buf1 = b.arrPtr[1:2:3] // ERROR "\(\*Buffer\).arrayPtr ignoring self-assignment in b.buf1 = b.arrPtr\[1:2:3\]$"
|
|
}
|
|
|
|
func (b *Buffer) baz() { // ERROR "\(\*Buffer\).baz b does not escape$"
|
|
b.str1 = b.str1[1:2] // ERROR "\(\*Buffer\).baz ignoring self-assignment in b.str1 = b.str1\[1:2\]$"
|
|
b.str1 = b.str2[1:2] // ERROR "\(\*Buffer\).baz ignoring self-assignment in b.str1 = b.str2\[1:2\]$"
|
|
}
|
|
|
|
func (b *Buffer) bat() { // ERROR "leaking param content: b$"
|
|
o := new(Buffer) // ERROR "new\(Buffer\) escapes to heap$"
|
|
o.buf1 = b.buf1[1:2]
|
|
sink = o // ERROR "o escapes to heap$"
|
|
}
|
|
|
|
func quux(sp *string, bp *[]byte) { // ERROR "quux bp does not escape$" "quux sp does not escape$"
|
|
*sp = (*sp)[1:2] // ERROR "quux ignoring self-assignment in \*sp = \(\*sp\)\[1:2\]$"
|
|
*bp = (*bp)[1:2] // ERROR "quux ignoring self-assignment in \*bp = \(\*bp\)\[1:2\]$"
|
|
}
|
|
|
|
type StructWithString struct {
|
|
p *int
|
|
s string
|
|
}
|
|
|
|
// This is escape analysis false negative.
|
|
// We assign the pointer to x.p but leak x.s. Escape analysis coarsens flows
|
|
// to just x, and thus &i looks escaping.
|
|
func fieldFlowTracking() {
|
|
var x StructWithString
|
|
i := 0 // ERROR "moved to heap: i$"
|
|
x.p = &i
|
|
sink = x.s // ERROR "x.s escapes to heap$"
|
|
}
|
|
|
|
// String operations.
|
|
|
|
func slicebytetostring0() {
|
|
b := make([]byte, 20) // ERROR "slicebytetostring0 make\(\[\]byte, 20\) does not escape$"
|
|
s := string(b) // ERROR "slicebytetostring0 string\(b\) does not escape$"
|
|
_ = s
|
|
}
|
|
|
|
func slicebytetostring1() {
|
|
b := make([]byte, 20) // ERROR "slicebytetostring1 make\(\[\]byte, 20\) does not escape$"
|
|
s := string(b) // ERROR "slicebytetostring1 string\(b\) does not escape$"
|
|
s1 := s[0:1]
|
|
_ = s1
|
|
}
|
|
|
|
func slicebytetostring2() {
|
|
b := make([]byte, 20) // ERROR "slicebytetostring2 make\(\[\]byte, 20\) does not escape$"
|
|
s := string(b) // ERROR "string\(b\) escapes to heap$"
|
|
s1 := s[0:1] // ERROR "moved to heap: s1$"
|
|
sink = &s1 // ERROR "&s1 escapes to heap$"
|
|
}
|
|
|
|
func slicebytetostring3() {
|
|
b := make([]byte, 20) // ERROR "slicebytetostring3 make\(\[\]byte, 20\) does not escape$"
|
|
s := string(b) // ERROR "string\(b\) escapes to heap$"
|
|
s1 := s[0:1]
|
|
sink = s1 // ERROR "s1 escapes to heap$"
|
|
}
|
|
|
|
func addstr0() {
|
|
s0 := "a"
|
|
s1 := "b"
|
|
s := s0 + s1 // ERROR "addstr0 s0 \+ s1 does not escape$"
|
|
_ = s
|
|
}
|
|
|
|
func addstr1() {
|
|
s0 := "a"
|
|
s1 := "b"
|
|
s := "c"
|
|
s += s0 + s1 // ERROR "addstr1 s0 \+ s1 does not escape$"
|
|
_ = s
|
|
}
|
|
|
|
func addstr2() {
|
|
b := make([]byte, 20) // ERROR "addstr2 make\(\[\]byte, 20\) does not escape$"
|
|
s0 := "a"
|
|
s := string(b) + s0 // ERROR "addstr2 string\(b\) \+ s0 does not escape$" "addstr2 string\(b\) does not escape$"
|
|
_ = s
|
|
}
|
|
|
|
func addstr3() {
|
|
s0 := "a"
|
|
s1 := "b"
|
|
s := s0 + s1 // ERROR "s0 \+ s1 escapes to heap$"
|
|
s2 := s[0:1]
|
|
sink = s2 // ERROR "s2 escapes to heap$"
|
|
}
|
|
|
|
func intstring0() bool {
|
|
// string does not escape
|
|
x := '0'
|
|
s := string(x) // ERROR "intstring0 string\(x\) does not escape$"
|
|
return s == "0"
|
|
}
|
|
|
|
func intstring1() string {
|
|
// string does not escape, but the buffer does
|
|
x := '0'
|
|
s := string(x) // ERROR "string\(x\) escapes to heap$"
|
|
return s
|
|
}
|
|
|
|
func intstring2() {
|
|
// string escapes to heap
|
|
x := '0'
|
|
s := string(x) // ERROR "moved to heap: s$" "string\(x\) escapes to heap$"
|
|
sink = &s // ERROR "&s escapes to heap$"
|
|
}
|
|
|
|
func stringtoslicebyte0() {
|
|
s := "foo"
|
|
x := []byte(s) // ERROR "stringtoslicebyte0 \(\[\]byte\)\(s\) does not escape$"
|
|
_ = x
|
|
}
|
|
|
|
func stringtoslicebyte1() []byte {
|
|
s := "foo"
|
|
return []byte(s) // ERROR "\(\[\]byte\)\(s\) escapes to heap$"
|
|
}
|
|
|
|
func stringtoslicebyte2() {
|
|
s := "foo"
|
|
sink = []byte(s) // ERROR "\(\[\]byte\)\(s\) escapes to heap$"
|
|
}
|
|
|
|
func stringtoslicerune0() {
|
|
s := "foo"
|
|
x := []rune(s) // ERROR "stringtoslicerune0 \(\[\]rune\)\(s\) does not escape$"
|
|
_ = x
|
|
}
|
|
|
|
func stringtoslicerune1() []rune {
|
|
s := "foo"
|
|
return []rune(s) // ERROR "\(\[\]rune\)\(s\) escapes to heap$"
|
|
}
|
|
|
|
func stringtoslicerune2() {
|
|
s := "foo"
|
|
sink = []rune(s) // ERROR "\(\[\]rune\)\(s\) escapes to heap$"
|
|
}
|
|
|
|
func slicerunetostring0() {
|
|
r := []rune{1, 2, 3} // ERROR "slicerunetostring0 \[\]rune literal does not escape$"
|
|
s := string(r) // ERROR "slicerunetostring0 string\(r\) does not escape$"
|
|
_ = s
|
|
}
|
|
|
|
func slicerunetostring1() string {
|
|
r := []rune{1, 2, 3} // ERROR "slicerunetostring1 \[\]rune literal does not escape$"
|
|
return string(r) // ERROR "string\(r\) escapes to heap$"
|
|
}
|
|
|
|
func slicerunetostring2() {
|
|
r := []rune{1, 2, 3} // ERROR "slicerunetostring2 \[\]rune literal does not escape$"
|
|
sink = string(r) // ERROR "string\(r\) escapes to heap$"
|
|
}
|
|
|
|
func makemap0() {
|
|
m := make(map[int]int) // ERROR "makemap0 make\(map\[int\]int\) does not escape$"
|
|
m[0] = 0
|
|
m[1]++
|
|
delete(m, 1)
|
|
sink = m[0] // ERROR "m\[0\] escapes to heap$"
|
|
}
|
|
|
|
func makemap1() map[int]int {
|
|
return make(map[int]int) // ERROR "make\(map\[int\]int\) escapes to heap$"
|
|
}
|
|
|
|
func makemap2() {
|
|
m := make(map[int]int) // ERROR "make\(map\[int\]int\) escapes to heap$"
|
|
sink = m // ERROR "m escapes to heap$"
|
|
}
|
|
|
|
func nonescapingEface(m map[interface{}]bool) bool { // ERROR "nonescapingEface m does not escape$"
|
|
return m["foo"] // ERROR "nonescapingEface .foo. does not escape$"
|
|
}
|
|
|
|
func nonescapingIface(m map[M]bool) bool { // ERROR "nonescapingIface m does not escape$"
|
|
return m[MV(0)] // ERROR "nonescapingIface MV\(0\) does not escape$"
|
|
}
|
|
|
|
func issue10353() {
|
|
x := new(int) // ERROR "new\(int\) escapes to heap$"
|
|
issue10353a(x)()
|
|
}
|
|
|
|
func issue10353a(x *int) func() { // ERROR "leaking param: x$"
|
|
return func() { // ERROR "func literal escapes to heap$"
|
|
println(*x)
|
|
}
|
|
}
|
|
|
|
func issue10353b() {
|
|
var f func()
|
|
for {
|
|
x := new(int) // ERROR "new\(int\) escapes to heap$"
|
|
f = func() { // ERROR "func literal escapes to heap$"
|
|
println(*x)
|
|
}
|
|
}
|
|
_ = f
|
|
}
|
|
|
|
func issue11387(x int) func() int {
|
|
f := func() int { return x } // ERROR "func literal escapes to heap"
|
|
slice1 := []func() int{f} // ERROR "\[\].* does not escape"
|
|
slice2 := make([]func() int, 1) // ERROR "make\(.*\) does not escape"
|
|
copy(slice2, slice1)
|
|
return slice2[0]
|
|
}
|
|
|
|
func issue12397(x, y int) { // ERROR "moved to heap: y$"
|
|
// x does not escape below, because all relevant code is dead.
|
|
if false {
|
|
gxx = &x
|
|
} else {
|
|
gxx = &y
|
|
}
|
|
|
|
if true {
|
|
gxx = &y
|
|
} else {
|
|
gxx = &x
|
|
}
|
|
}
|