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gc: test + fix escape analysis bug

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R=lvd
CC=golang-dev
https://golang.org/cl/5333049
This commit is contained in:
Russ Cox 2011-11-01 11:02:43 -04:00
parent 1fe22d2d24
commit b4df33a6ea
2 changed files with 89 additions and 70 deletions
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1
src/cmd/gc/esc.c
View File

@ -239,6 +239,7 @@ esc(Node *n)
case OPROC:
// go f(x) - f and x escape
escassign(&theSink, n->left->left);
escassign(&theSink, n->left->right); // ODDDARG for call
for(ll=n->left->list; ll; ll=ll->next)
escassign(&theSink, ll->n);
break;

158
test/escape2.go
View File

@ -6,12 +6,15 @@
package foo
import "unsafe"
import (
"fmt"
"unsafe"
)
var gxx *int
func foo1(x int) { // ERROR "moved to heap: x"
gxx = &x // ERROR "&x escapes to heap"
gxx = &x // ERROR "&x escapes to heap"
}
func foo2(yy *int) { // ERROR "leaking param: yy"
@ -19,7 +22,7 @@ func foo2(yy *int) { // ERROR "leaking param: yy"
}
func foo3(x int) *int { // ERROR "moved to heap: x"
return &x // ERROR "&x escapes to heap"
return &x // ERROR "&x escapes to heap"
}
type T *T
@ -35,7 +38,7 @@ func foo4(xx, yy *int) { // ERROR "xx does not escape" "yy does not escape"
// 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"
xx = &yy // ERROR "&yy does not escape"
}
func foo6(xx **int, yy *int) { // ERROR "xx does not escape" "leaking param: yy"
@ -62,8 +65,8 @@ func foo10(xx, yy *int) { // ERROR "xx does not escape" "yy does not escape"
func foo11() int {
x, y := 0, 42
xx := &x // ERROR "&x does not escape"
yy := &y // ERROR "&y does not escape"
xx := &x // ERROR "&x does not escape"
yy := &y // ERROR "&y does not escape"
*xx = *yy
return x
}
@ -83,7 +86,7 @@ func foo14(yyy **int) { // ERROR "yyy does not escape"
}
func foo15(yy *int) { // ERROR "moved to heap: yy"
xxx = &yy // ERROR "&yy escapes to heap"
xxx = &yy // ERROR "&yy escapes to heap"
}
func foo16(yy *int) { // ERROR "leaking param: yy"
@ -95,7 +98,7 @@ func foo17(yy *int) { // ERROR "yy does not escape"
}
func foo18(y int) { // ERROR "moved to heap: "y"
*xxx = &y // ERROR "&y escapes to heap"
*xxx = &y // ERROR "&y escapes to heap"
}
func foo19(y int) {
@ -127,7 +130,7 @@ func (b *Bar) AlsoNoLeak() *int { // ERROR "b does not escape"
return b.ii
}
func goLeak(b *Bar) { // ERROR "leaking param: b"
func goLeak(b *Bar) { // ERROR "leaking param: b"
go b.NoLeak()
}
@ -145,7 +148,7 @@ func (b *Bar2) NoLeak() int { // ERROR "b does not escape"
}
func (b *Bar2) Leak() []int { // ERROR "leaking param: b"
return b.i[:] // ERROR "&b.i escapes to heap"
return b.i[:] // ERROR "&b.i escapes to heap"
}
func (b *Bar2) AlsoNoLeak() []int { // ERROR "b does not escape"
@ -153,49 +156,49 @@ func (b *Bar2) AlsoNoLeak() []int { // ERROR "b does not escape"
}
func (b *Bar2) LeakSelf() { // ERROR "leaking param: b"
b.ii = b.i[0:4] // ERROR "&b.i escapes to heap"
b.ii = b.i[0:4] // ERROR "&b.i escapes to heap"
}
func (b *Bar2) LeakSelf2() { // ERROR "leaking param: b"
var buf []int
buf = b.i[0:] // ERROR "&b.i escapes to heap"
buf = b.i[0:] // ERROR "&b.i escapes to heap"
b.ii = buf
}
func foo21() func() int {
x := 42 // ERROR "moved to heap: x"
return func() int { // ERROR "func literal escapes to heap"
return x // ERROR "&x escapes to heap"
x := 42 // ERROR "moved to heap: 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 func() int { // ERROR "func literal does not escape"
return x
}()
}
func foo23(x int) func() int { // ERROR "moved to heap: x"
return func() int { // ERROR "func literal escapes to heap"
return x // ERROR "&x escapes to heap"
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: x"
f := func() int { // ERROR "func literal escapes to heap"
return x // ERROR "&x escapes to heap"
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: x"
f := func() int { return x } // ERROR "moved to heap: f" "func literal escapes to heap" "&x escapes to heap"
return &f // ERROR "&f 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 func() int { // ERROR "func literal does not escape"
return x
}()
}
@ -212,11 +215,11 @@ func foonoleak(xx *int) int { // ERROR "xx does not escape"
}
func foo31(x int) int { // ERROR "moved to heap: x"
return fooleak(&x) // ERROR "&x escapes to heap"
return fooleak(&x) // ERROR "&x escapes to heap"
}
func foo32(x int) int {
return foonoleak(&x) // ERROR "&x does not escape"
return foonoleak(&x) // ERROR "&x does not escape"
}
type Foo struct {
@ -244,15 +247,15 @@ func (f *Foo) NoLeak() { // ERROR "f does not escape"
}
func foo41(x int) { // ERROR "moved to heap: x"
F.xx = &x // ERROR "&x escapes to heap"
F.xx = &x // ERROR "&x escapes to heap"
}
func (f *Foo) foo42(x int) { // ERROR "f does not escape" "moved to heap: x"
f.xx = &x // ERROR "&x escapes to heap"
f.xx = &x // ERROR "&x escapes to heap"
}
func foo43(f *Foo, x int) { // ERROR "f does not escape" "moved to heap: x"
f.xx = &x // ERROR "&x escapes to heap"
f.xx = &x // ERROR "&x escapes to heap"
}
func foo44(yy *int) { // ERROR "leaking param: yy"
@ -268,7 +271,7 @@ func (f *Foo) foo46() { // ERROR "f does not escape"
}
func (f *Foo) foo47() { // ERROR "leaking param: f"
f.xx = &f.x // ERROR "&f.x escapes to heap"
f.xx = &f.x // ERROR "&f.x escapes to heap"
}
var ptrSlice []*int
@ -284,38 +287,38 @@ func foo51(i *int) { // ERROR "leaking param: i"
}
func indaddr1(x int) *int { // ERROR "moved to heap: x"
return &x // ERROR "&x escapes to heap"
return &x // ERROR "&x escapes to heap"
}
func indaddr2(x *int) *int { // ERROR "leaking param: x"
return *&x // ERROR "&x does not escape"
return *&x // ERROR "&x does not escape"
}
func indaddr3(x *int32) *int { // ERROR "leaking param: x"
return *(**int)(unsafe.Pointer(&x)) // ERROR "&x does not escape"
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"
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"
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"
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"
return *(*float64)(unsafe.Pointer(&b)) // ERROR "&b does not escape"
}
// contrast with
func float64bitsptr(f float64) *uint64 { // ERROR "moved to heap: f"
return (*uint64)(unsafe.Pointer(&f)) // ERROR "&f escapes to heap"
return (*uint64)(unsafe.Pointer(&f)) // ERROR "&f escapes to heap"
}
func float64ptrbitsptr(f *float64) *uint64 { // ERROR "leaking param: f"
@ -328,7 +331,7 @@ func typesw(i interface{}) *int { // ERROR "leaking param: i"
return val
case *int8:
v := int(*val) // ERROR "moved to heap: v"
return &v // ERROR "&v escapes to heap"
return &v // ERROR "&v escapes to heap"
}
return nil
}
@ -409,12 +412,12 @@ func (MV) M() {}
func foo65() {
var mv MV
foo63(&mv) // ERROR "&mv does not escape"
foo63(&mv) // ERROR "&mv does not escape"
}
func foo66() {
var mv MV // ERROR "moved to heap: mv"
foo64(&mv) // ERROR "&mv escapes to heap"
var mv MV // ERROR "moved to heap: mv"
foo64(&mv) // ERROR "&mv escapes to heap"
}
func foo67() {
@ -444,20 +447,20 @@ func foo71(x *int) []*int { // ERROR "leaking param: x"
func foo71a(x int) []*int { // ERROR "moved to heap: x"
var y []*int
y = append(y, &x) // ERROR "&x escapes to heap"
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"
y[0] = &x // ERROR "&x does not escape"
}
func foo72aa() [10]*int {
var x int // ERROR "moved to heap: x"
var y [10]*int
y[0] = &x // ERROR "&x escapes to heap"
y[0] = &x // ERROR "&x escapes to heap"
return y
}
@ -465,7 +468,7 @@ func foo72a() {
var y [10]*int
for i := 0; i < 10; i++ {
// escapes its scope
x := i // ERROR "moved to heap: x"
x := i // ERROR "moved to heap: x"
y[i] = &x // ERROR "&x escapes to heap"
}
return
@ -474,8 +477,8 @@ func foo72a() {
func foo72b() [10]*int {
var y [10]*int
for i := 0; i < 10; i++ {
x := i // ERROR "moved to heap: x"
y[i] = &x // ERROR "&x escapes to heap"
x := i // ERROR "moved to heap: x"
y[i] = &x // ERROR "&x escapes to heap"
}
return y
}
@ -484,10 +487,10 @@ func foo72b() [10]*int {
func foo73() {
s := []int{3, 2, 1} // ERROR "\[\]int literal does not escape"
for _, v := range s {
vv := v // ERROR "moved to heap: vv"
vv := v // ERROR "moved to heap: vv"
// actually just escapes its scope
defer func() { // ERROR "func literal escapes to heap"
println(vv) // ERROR "&vv escapes to heap"
println(vv) // ERROR "&vv escapes to heap"
}()
}
}
@ -495,10 +498,10 @@ func foo73() {
func foo74() {
s := []int{3, 2, 1} // ERROR "\[\]int literal does not escape"
for _, v := range s {
vv := v // ERROR "moved to heap: vv"
vv := v // ERROR "moved to heap: vv"
// actually just escapes its scope
fn := func() { // ERROR "func literal escapes to heap"
println(vv) // ERROR "&vv escapes to heap"
println(vv) // ERROR "&vv escapes to heap"
}
defer fn()
}
@ -509,7 +512,7 @@ func myprint(y *int, x ...interface{}) *int { // ERROR "x does not escape" "leak
}
func myprint1(y *int, x ...interface{}) *interface{} { // ERROR "y does not escape" "leaking param: x"
return &x[0] // ERROR "&x.0. escapes to heap"
return &x[0] // ERROR "&x.0. escapes to heap"
}
func foo75(z *int) { // ERROR "leaking param: z"
@ -566,12 +569,12 @@ func foo77a(z []interface{}) { // ERROR "leaking param: z"
}
func foo78(z int) *int { // ERROR "moved to heap: z"
return &z // ERROR "&z escapes to heap"
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"
y := &z // ERROR "&z escapes to heap"
x := &y // ERROR "&y does not escape"
return *x // really return y
}
@ -685,7 +688,7 @@ func foo101(m [1]*int) *int { // ERROR "leaking param: m"
// 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 &i // ERROR "&i escapes to heap"
}
return nil
}
@ -703,12 +706,12 @@ func foo103(m [1]*int, x *int) { // ERROR "m does not escape" "x does not escape
var y []*int
// does not leak x
func foo104(x []*int) { // ERROR "x does not escape"
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"
func foo105(x []*int) { // ERROR "x does not escape"
_ = append(y, x...)
}
@ -726,7 +729,7 @@ func foo108(x *int) map[*int]*int { // ERROR "leaking param: x"
}
func foo109(x *int) *int { // ERROR "leaking param: x"
m := map[*int]*int{x: nil} // ERROR "map.* literal does not escape"
m := map[*int]*int{x: nil} // ERROR "map.* literal does not escape"
for k, _ := range m {
return k
}
@ -734,12 +737,12 @@ func foo109(x *int) *int { // ERROR "leaking param: x"
}
func foo110(x *int) *int { // ERROR "leaking param: x"
m := map[*int]*int{nil: x} // ERROR "map.* literal does not escape"
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"
m := []*int{x} // ERROR "\[\]\*int literal does not escape"
return m[0]
}
@ -754,7 +757,7 @@ func foo113(x *int) *int { // ERROR "leaking param: x"
}
func foo114(x *int) *int { // ERROR "leaking param: x"
m := &Bar{ii: x} // ERROR "&Bar literal does not escape"
m := &Bar{ii: x} // ERROR "&Bar literal does not escape"
return m.ii
}
@ -764,28 +767,28 @@ func foo115(x *int) *int { // ERROR "leaking param: x"
func foo116(b bool) *int {
if b {
x := 1 // ERROR "moved to heap: x"
return &x // ERROR "&x escapes to heap"
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"
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"
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"
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"
func foo119(x *int) { // ERROR "leaking param: x"
external(x)
}
@ -993,3 +996,18 @@ L100:
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"
}
}