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go/test/escape2.go
Russ Cox 60d47101aa gc: fix label recursion bugs 
Was keeping a pointer to the labeled statement in n->right,
which meant that generic traversals of the tree visited it twice.
That combined with aggressive flattening of the block
structure when possible during parsing meant that
the kinds of label: code label: code label: code sequences
generated by yacc were giving the recursion 2ⁿ paths
through the program.

Fixes #2212.

R=lvd
CC=golang-dev
https://golang.org/cl/4960050
2011-09-01 13:44:46 -04:00

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18 KiB
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// errchk -0 $G -m $D/$F.go
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package foo
import "unsafe"
var gxx *int
func foo1(x int) { // ERROR "moved to heap: NAME-x"
gxx = &x // ERROR "&x escapes to heap"
}
func foo2(yy *int) { // ERROR "leaking param: NAME-yy"
gxx = yy
}
func foo3(x int) *int { // ERROR "moved to heap: NAME-x"
return &x // ERROR "&x escapes to heap"
}
type T *T
func foo3b(t T) { // ERROR "leaking param: NAME-t"
*t = t
}
// xx isn't going anywhere, so use of yy is ok
func foo4(xx, yy *int) { // ERROR "xx does not escape" "yy does not escape"
xx = yy
}
// xx isn't going anywhere, so taking address of yy is ok
func foo5(xx **int, yy *int) { // ERROR "xx does not escape" "yy does not escape"
xx = &yy // ERROR "&yy does not escape"
}
func foo6(xx **int, yy *int) { // ERROR "xx does not escape" "leaking param: NAME-yy"
*xx = yy
}
func foo7(xx **int, yy *int) { // ERROR "xx does not escape" "yy does not escape"
**xx = *yy
}
func foo8(xx, yy *int) int { // ERROR "xx does not escape" "yy does not escape"
xx = yy
return *xx
}
func foo9(xx, yy *int) *int { // ERROR "leaking param: NAME-xx" "leaking param: NAME-yy"
xx = yy
return xx
}
func foo10(xx, yy *int) { // ERROR "xx does not escape" "yy does not escape"
*xx = *yy
}
func foo11() int {
x, y := 0, 42
xx := &x // ERROR "&x does not escape"
yy := &y // ERROR "&y does not escape"
*xx = *yy
return x
}
var xxx **int
func foo12(yyy **int) { // ERROR "leaking param: NAME-yyy"
xxx = yyy
}
func foo13(yyy **int) { // ERROR "yyy does not escape"
*xxx = *yyy
}
func foo14(yyy **int) { // ERROR "yyy does not escape"
**xxx = **yyy
}
func foo15(yy *int) { // ERROR "moved to heap: NAME-yy"
xxx = &yy // ERROR "&yy escapes to heap"
}
func foo16(yy *int) { // ERROR "leaking param: NAME-yy"
*xxx = yy
}
func foo17(yy *int) { // ERROR "yy does not escape"
**xxx = *yy
}
func foo18(y int) { // ERROR "moved to heap: "NAME-y"
*xxx = &y // ERROR "&y escapes to heap"
}
func foo19(y int) {
**xxx = y
}
type Bar struct {
i int
ii *int
}
func NewBar() *Bar {
return &Bar{42, nil} // ERROR "&struct literal escapes to heap"
}
func NewBarp(x *int) *Bar { // ERROR "leaking param: NAME-x"
return &Bar{42, x} // ERROR "&struct literal escapes to heap"
}
func NewBarp2(x *int) *Bar { // ERROR "x does not escape"
return &Bar{*x, nil} // ERROR "&struct literal escapes to heap"
}
func (b *Bar) NoLeak() int { // ERROR "b does not escape"
return *(b.ii)
}
func (b *Bar) AlsoNoLeak() *int { // ERROR "b does not escape"
return b.ii
}
type Bar2 struct {
i [12]int
ii []int
}
func NewBar2() *Bar2 {
return &Bar2{[12]int{42}, nil} // ERROR "&struct literal escapes to heap"
}
func (b *Bar2) NoLeak() int { // ERROR "b does not escape"
return b.i[0]
}
func (b *Bar2) Leak() []int { // ERROR "leaking param: NAME-b"
return b.i[:] // ERROR "&b.i escapes to heap"
}
func (b *Bar2) AlsoNoLeak() []int { // ERROR "b does not escape"
return b.ii[0:1]
}
func (b *Bar2) LeakSelf() { // ERROR "leaking param: NAME-b"
b.ii = b.i[0:4] // ERROR "&b.i escapes to heap"
}
func (b *Bar2) LeakSelf2() { // ERROR "leaking param: NAME-b"
var buf []int
buf = b.i[0:] // ERROR "&b.i escapes to heap"
b.ii = buf
}
func foo21() func() int {
x := 42 // ERROR "moved to heap: NAME-x"
return func() int { // ERROR "func literal escapes to heap"
return x // ERROR "&x escapes to heap"
}
}
func foo22() int {
x := 42
return func() int { // ERROR "func literal does not escape"
return x
}()
}
func foo23(x int) func() int { // ERROR "moved to heap: NAME-x"
return func() int { // ERROR "func literal escapes to heap"
return x // ERROR "&x escapes to heap"
}
}
func foo23a(x int) func() int { // ERROR "moved to heap: NAME-x"
f := func() int { // ERROR "func literal escapes to heap"
return x // ERROR "&x escapes to heap"
}
return f
}
func foo23b(x int) *(func() int) { // ERROR "moved to heap: NAME-x"
f := func() int { return x } // ERROR "moved to heap: NAME-f" "func literal escapes to heap" "&x escapes to heap"
return &f // ERROR "&f escapes to heap"
}
func foo24(x int) int {
return func() int { // ERROR "func literal does not escape"
return x
}()
}
var x *int
func fooleak(xx *int) int { // ERROR "leaking param: NAME-xx"
x = xx
return *x
}
func foonoleak(xx *int) int { // ERROR "xx does not escape"
return *x + *xx
}
func foo31(x int) int { // ERROR "moved to heap: NAME-x"
return fooleak(&x) // ERROR "&x escapes to heap"
}
func foo32(x int) int {
return foonoleak(&x) // ERROR "&x does not escape"
}
type Foo struct {
xx *int
x int
}
var F Foo
var pf *Foo
func (f *Foo) fooleak() { // ERROR "leaking param: NAME-f"
pf = f
}
func (f *Foo) foonoleak() { // ERROR "f does not escape"
F.x = f.x
}
func (f *Foo) Leak() { // ERROR "leaking param: NAME-f"
f.fooleak()
}
func (f *Foo) NoLeak() { // ERROR "f does not escape"
f.foonoleak()
}
func foo41(x int) { // ERROR "moved to heap: NAME-x"
F.xx = &x // ERROR "&x escapes to heap"
}
func (f *Foo) foo42(x int) { // ERROR "f does not escape" "moved to heap: NAME-x"
f.xx = &x // ERROR "&x escapes to heap"
}
func foo43(f *Foo, x int) { // ERROR "f does not escape" "moved to heap: NAME-x"
f.xx = &x // ERROR "&x escapes to heap"
}
func foo44(yy *int) { // ERROR "leaking param: NAME-yy"
F.xx = yy
}
func (f *Foo) foo45() { // ERROR "f does not escape"
F.x = f.x
}
func (f *Foo) foo46() { // ERROR "f does not escape"
F.xx = f.xx
}
func (f *Foo) foo47() { // ERROR "leaking param: NAME-f"
f.xx = &f.x // ERROR "&f.x escapes to heap"
}
var ptrSlice []*int
func foo50(i *int) { // ERROR "leaking param: NAME-i"
ptrSlice[0] = i
}
var ptrMap map[*int]*int
func foo51(i *int) { // ERROR "leaking param: NAME-i"
ptrMap[i] = i
}
func indaddr1(x int) *int { // ERROR "moved to heap: NAME-x"
return &x // ERROR "&x escapes to heap"
}
func indaddr2(x *int) *int { // ERROR "leaking param: NAME-x"
return *&x // ERROR "&x does not escape"
}
func indaddr3(x *int32) *int { // ERROR "leaking param: NAME-x"
return *(**int)(unsafe.Pointer(&x)) // ERROR "&x does not escape"
}
// From package math:
func Float32bits(f float32) uint32 {
return *(*uint32)(unsafe.Pointer(&f)) // ERROR "&f does not escape"
}
func Float32frombits(b uint32) float32 {
return *(*float32)(unsafe.Pointer(&b)) // ERROR "&b does not escape"
}
func Float64bits(f float64) uint64 {
return *(*uint64)(unsafe.Pointer(&f)) // ERROR "&f does not escape"
}
func Float64frombits(b uint64) float64 {
return *(*float64)(unsafe.Pointer(&b)) // ERROR "&b does not escape"
}
// contrast with
func float64bitsptr(f float64) *uint64 { // ERROR "moved to heap: NAME-f"
return (*uint64)(unsafe.Pointer(&f)) // ERROR "&f escapes to heap"
}
func float64ptrbitsptr(f *float64) *uint64 { // ERROR "leaking param: NAME-f"
return (*uint64)(unsafe.Pointer(f))
}
func typesw(i interface{}) *int { // ERROR "leaking param: NAME-i"
switch val := i.(type) {
case *int:
return val
case *int8:
v := int(*val) // ERROR "moved to heap: NAME-v"
return &v // ERROR "&v escapes to heap"
}
return nil
}
func exprsw(i *int) *int { // ERROR "leaking param: NAME-i"
switch j := i; *j + 110 {
case 12:
return j
case 42:
return nil
}
return nil
}
// assigning to an array element is like assigning to the array
func foo60(i *int) *int { // ERROR "leaking param: NAME-i"
var a [12]*int
a[0] = i
return a[1]
}
func foo60a(i *int) *int { // ERROR "i does not escape"
var a [12]*int
a[0] = i
return nil
}
// assigning to a struct field is like assigning to the struct
func foo61(i *int) *int { // ERROR "leaking param: NAME-i"
type S struct {
a, b *int
}
var s S
s.a = i
return s.b
}
func foo61a(i *int) *int { // ERROR "i does not escape"
type S struct {
a, b *int
}
var s S
s.a = i
return nil
}
// assigning to a struct field is like assigning to the struct but
// here this subtlety is lost, since s.a counts as an assignment to a
// track-losing dereference.
func foo62(i *int) *int { // ERROR "leaking param: NAME-i"
type S struct {
a, b *int
}
s := new(S) // ERROR "new[(]S[)] does not escape"
s.a = i
return nil // s.b
}
type M interface {
M()
}
func foo63(m M) { // ERROR "m does not escape"
}
func foo64(m M) { // ERROR "leaking param: NAME-m"
m.M()
}
type MV int
func (MV) M() {}
func foo65() {
var mv MV
foo63(&mv) // ERROR "&mv does not escape"
}
func foo66() {
var mv MV // ERROR "moved to heap: NAME-mv"
foo64(&mv) // ERROR "&mv escapes to heap"
}
func foo67() {
var mv MV
foo63(mv)
}
func foo68() {
var mv MV
foo64(mv) // escapes but it's an int so irrelevant
}
func foo69(m M) { // ERROR "leaking param: NAME-m"
foo64(m)
}
func foo70(mv1 *MV, m M) { // ERROR "leaking param: NAME-mv1" "leaking param: NAME-m"
m = mv1
foo64(m)
}
func foo71(x *int) []*int { // ERROR "leaking param: NAME-x"
var y []*int
y = append(y, x)
return y
}
func foo71a(x int) []*int { // ERROR "moved to heap: NAME-x"
var y []*int
y = append(y, &x) // ERROR "&x escapes to heap"
return y
}
func foo72() {
var x int
var y [1]*int
y[0] = &x // ERROR "&x does not escape"
}
func foo72aa() [10]*int {
var x int // ERROR "moved to heap: NAME-x"
var y [10]*int
y[0] = &x // ERROR "&x escapes to heap"
return y
}
func foo72a() {
var y [10]*int
for i := 0; i < 10; i++ {
// escapes its scope
x := i // ERROR "moved to heap: NAME-x"
y[i] = &x // ERROR "&x escapes to heap"
}
return
}
func foo72b() [10]*int {
var y [10]*int
for i := 0; i < 10; i++ {
x := i // ERROR "moved to heap: NAME-x"
y[i] = &x // ERROR "&x escapes to heap"
}
return y
}
// issue 2145
func foo73() {
s := []int{3, 2, 1} // ERROR "slice literal does not escape"
for _, v := range s {
vv := v // ERROR "moved to heap: NAME-vv"
// actually just escapes its scope
defer func() { // ERROR "func literal escapes to heap"
println(vv) // ERROR "&vv escapes to heap"
}()
}
}
func foo74() {
s := []int{3, 2, 1} // ERROR "slice literal does not escape"
for _, v := range s {
vv := v // ERROR "moved to heap: NAME-vv"
// actually just escapes its scope
fn := func() { // ERROR "func literal escapes to heap"
println(vv) // ERROR "&vv escapes to heap"
}
defer fn()
}
}
func myprint(y *int, x ...interface{}) *int { // ERROR "x does not escape" "leaking param: NAME-y"
return y
}
func myprint1(y *int, x ...interface{}) *interface{} { // ERROR "y does not escape" "leaking param: NAME-x"
return &x[0] // ERROR "&x.0. escapes to heap"
}
func foo75(z *int) { // ERROR "leaking param: NAME-z"
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 escapes to heap"
}
func foo76(z *int) { // ERROR "leaking param: NAME-z"
myprint(nil, z) // ERROR "[.][.][.] argument does not escape"
}
func foo76a(z *int) { // ERROR "leaking param: NAME-z"
myprint1(nil, z) // ERROR "[.][.][.] argument escapes to heap"
}
func foo76b() {
myprint(nil, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
}
func foo76c() {
myprint1(nil, 1, 2, 3) // ERROR "[.][.][.] argument escapes to heap"
}
func foo76d() {
defer myprint(nil, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
}
func foo76e() {
defer myprint1(nil, 1, 2, 3) // ERROR "[.][.][.] argument escapes to heap"
}
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 "leaking param: NAME-z"
myprint1(nil, z...)
}
func foo78(z int) *int { // ERROR "moved to heap: NAME-z"
return &z // ERROR "&z escapes to heap"
}
func foo78a(z int) *int { // ERROR "moved to heap: NAME-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
}
type Fooer interface {
Foo()
}
type LimitedFooer struct {
Fooer
N int64
}
func LimitFooer(r Fooer, n int64) Fooer { // ERROR "leaking param: NAME-r"
return &LimitedFooer{r, n} // ERROR "&struct literal escapes to heap"
}
func foo90(x *int) map[*int]*int { // ERROR "leaking param: NAME-x"
return map[*int]*int{nil: x} // ERROR "map literal escapes to heap"
}
func foo91(x *int) map[*int]*int { // ERROR "leaking param: NAME-x"
return map[*int]*int{x: nil} // ERROR "map literal escapes to heap"
}
func foo92(x *int) [2]*int { // ERROR "leaking param: NAME-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: NAME-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: NAME-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: NAME-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: NAME-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: NAME-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: NAME-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: NAME-x"
_ = append(y, x)
}
func foo107(x *int) map[*int]*int { // ERROR "leaking param: NAME-x"
return map[*int]*int{x: nil} // ERROR "map literal escapes to heap"
}
func foo108(x *int) map[*int]*int { // ERROR "leaking param: NAME-x"
return map[*int]*int{nil: x} // ERROR "map literal escapes to heap"
}
func foo109(x *int) *int { // ERROR "leaking param: NAME-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: NAME-x"
m := map[*int]*int{nil: x} // ERROR "map literal does not escape"
return m[nil]
}
func foo111(x *int) *int { // ERROR "leaking param: NAME-x"
m := []*int{x} // ERROR "slice literal does not escape"
return m[0]
}
func foo112(x *int) *int { // ERROR "leaking param: NAME-x"
m := [1]*int{x}
return m[0]
}
func foo113(x *int) *int { // ERROR "leaking param: NAME-x"
m := Bar{ii: x}
return m.ii
}
func foo114(x *int) *int { // ERROR "leaking param: NAME-x"
m := &Bar{ii: x} // ERROR "&struct literal does not escape"
return m.ii
}
func foo115(x *int) *int { // ERROR "leaking param: NAME-x"
return (*int)(unsafe.Pointer(uintptr(unsafe.Pointer(x)) + 1))
}
func foo116(b bool) *int {
if b {
x := 1 // ERROR "moved to heap: NAME-x"
return &x // ERROR "&x escapes to heap"
} else {
y := 1 // ERROR "moved to heap: NAME-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: NAME-x"
unknown(&x) // ERROR "&x escapes to heap"
}
func foo118(unknown func(*int)) { // ERROR "unknown does not escape"
x := 1 // ERROR "moved to heap: NAME-x"
unknown(&x) // ERROR "&x escapes to heap"
}
func external(*int)
func foo119(x *int) { // ERROR "leaking param: NAME-x"
external(x)
}
func foo120() {
// formerly exponential time analysis
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// 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
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goto L31
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goto L93
goto L94
goto L95
goto L96
goto L97
goto L98
goto L99
goto L100
}
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