cmd/gc: run escape analysis always (even in -N mode)
Fixes #8585.
Removes some little-used code paths.
LGTM=josharian
R=golang-codereviews, minux, josharian
CC=golang-codereviews, iant, r
https://golang.org/cl/132970043
diff --git a/test/escape2.go b/test/escape2.go
index 28251aa..6a46ce8 100644
--- a/test/escape2.go
+++ b/test/escape2.go
@@ -7,6 +7,8 @@
// Test, using compiler diagnostic flags, that the escape analysis is working.
// Compiles but does not run. Inlining is disabled.
+// escape2n.go contains all the same tests but compiles with -N.
+
package foo
import (
diff --git a/test/escape2n.go b/test/escape2n.go
new file mode 100644
index 0000000..002a78e
--- /dev/null
+++ b/test/escape2n.go
@@ -0,0 +1,1494 @@
+// errorcheck -0 -N -m -l
+
+// 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.
+
+// Test, using compiler diagnostic flags, that the escape analysis is working.
+// Compiles but does not run. Inlining is disabled.
+// Registerization is disabled too (-N), which should
+// have no effect on escape analysis.
+
+package foo
+
+import (
+ "fmt"
+ "unsafe"
+)
+
+var gxx *int
+
+func foo1(x int) { // ERROR "moved to heap: x"
+ gxx = &x // ERROR "&x escapes to heap"
+}
+
+func foo2(yy *int) { // ERROR "leaking param: yy"
+ gxx = yy
+}
+
+func foo3(x int) *int { // ERROR "moved to heap: x"
+ return &x // ERROR "&x escapes to heap"
+}
+
+type T *T
+
+func foo3b(t T) { // ERROR "leaking param: 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: 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: xx" "leaking param: 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: yyy"
+ xxx = yyy
+}
+
+// Must treat yyy as leaking because *yyy leaks, and the escape analysis
+// summaries in exported metadata do not distinguish these two cases.
+func foo13(yyy **int) { // ERROR "leaking param: yyy"
+ *xxx = *yyy
+}
+
+func foo14(yyy **int) { // ERROR "yyy does not escape"
+ **xxx = **yyy
+}
+
+func foo15(yy *int) { // ERROR "moved to heap: yy"
+ xxx = &yy // ERROR "&yy escapes to heap"
+}
+
+func foo16(yy *int) { // ERROR "leaking param: yy"
+ *xxx = yy
+}
+
+func foo17(yy *int) { // ERROR "yy does not escape"
+ **xxx = *yy
+}
+
+func foo18(y int) { // ERROR "moved to heap: "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 "&Bar literal escapes to heap"
+}
+
+func NewBarp(x *int) *Bar { // ERROR "leaking param: x"
+ return &Bar{42, x} // ERROR "&Bar literal escapes to heap"
+}
+
+func NewBarp2(x *int) *Bar { // ERROR "x does not escape"
+ return &Bar{*x, nil} // ERROR "&Bar literal escapes to heap"
+}
+
+func (b *Bar) NoLeak() int { // ERROR "b does not escape"
+ return *(b.ii)
+}
+
+func (b *Bar) Leak() *int { // ERROR "leaking param: b"
+ return &b.i // ERROR "&b.i escapes to heap"
+}
+
+func (b *Bar) AlsoNoLeak() *int { // ERROR "leaking param b content to result ~r0"
+ return b.ii
+}
+
+func (b Bar) AlsoLeak() *int { // ERROR "leaking param: b"
+ return b.ii
+}
+
+func (b Bar) LeaksToo() *int { // ERROR "leaking param: b"
+ v := 0 // ERROR "moved to heap: v"
+ b.ii = &v // ERROR "&v escapes"
+ return b.ii
+}
+
+func (b *Bar) LeaksABit() *int { // ERROR "leaking param b content to result ~r0"
+ v := 0 // ERROR "moved to heap: v"
+ b.ii = &v // ERROR "&v escapes"
+ return b.ii
+}
+
+func (b Bar) StillNoLeak() int { // ERROR "b does not escape"
+ v := 0
+ b.ii = &v // ERROR "&v does not escape"
+ return b.i
+}
+
+func goLeak(b *Bar) { // ERROR "leaking param: b"
+ go b.NoLeak()
+}
+
+type Bar2 struct {
+ i [12]int
+ ii []int
+}
+
+func NewBar2() *Bar2 {
+ return &Bar2{[12]int{42}, nil} // ERROR "&Bar2 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: b"
+ return b.i[:] // ERROR "b.i escapes to heap"
+}
+
+func (b *Bar2) AlsoNoLeak() []int { // ERROR "leaking param b content to result ~r0"
+ return b.ii[0:1]
+}
+
+func (b Bar2) AgainNoLeak() [12]int { // ERROR "b does not escape"
+ return b.i
+}
+
+func (b *Bar2) LeakSelf() { // ERROR "leaking param: b"
+ 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"
+ 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"
+ }
+}
+
+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: 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: 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: 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"
+}
+
+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: 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: 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: f"
+ pf = f
+}
+
+func (f *Foo) foonoleak() { // ERROR "f does not escape"
+ F.x = f.x
+}
+
+func (f *Foo) Leak() { // ERROR "leaking param: f"
+ f.fooleak()
+}
+
+func (f *Foo) NoLeak() { // ERROR "f does not escape"
+ f.foonoleak()
+}
+
+func foo41(x int) { // ERROR "moved to heap: x"
+ 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"
+}
+
+func foo43(f *Foo, x int) { // ERROR "f does not escape" "moved to heap: x"
+ f.xx = &x // ERROR "&x escapes to heap"
+}
+
+func foo44(yy *int) { // ERROR "leaking param: yy"
+ F.xx = yy
+}
+
+func (f *Foo) foo45() { // ERROR "f does not escape"
+ F.x = f.x
+}
+
+// See foo13 above for explanation of why f leaks.
+func (f *Foo) foo46() { // ERROR "leaking param: f"
+ F.xx = f.xx
+}
+
+func (f *Foo) foo47() { // ERROR "leaking param: f"
+ f.xx = &f.x // ERROR "&f.x escapes to heap"
+}
+
+var ptrSlice []*int
+
+func foo50(i *int) { // ERROR "leaking param: i"
+ ptrSlice[0] = i
+}
+
+var ptrMap map[*int]*int
+
+func foo51(i *int) { // ERROR "leaking param: i"
+ ptrMap[i] = i
+}
+
+func indaddr1(x int) *int { // ERROR "moved to heap: x"
+ return &x // ERROR "&x escapes to heap"
+}
+
+func indaddr2(x *int) *int { // ERROR "leaking param: x"
+ 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"
+}
+
+// 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: f"
+ return (*uint64)(unsafe.Pointer(&f)) // ERROR "&f escapes to heap"
+}
+
+func float64ptrbitsptr(f *float64) *uint64 { // ERROR "leaking param: f"
+ return (*uint64)(unsafe.Pointer(f))
+}
+
+func typesw(i interface{}) *int { // ERROR "leaking param: i"
+ switch val := i.(type) {
+ case *int:
+ return val
+ case *int8:
+ v := int(*val) // ERROR "moved to heap: v"
+ return &v // ERROR "&v escapes to heap"
+ }
+ return nil
+}
+
+func exprsw(i *int) *int { // ERROR "leaking param: 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: 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: 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: 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: m"
+ m.M()
+}
+
+func foo64b(m M) { // ERROR "leaking param: m"
+ defer 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: 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: m"
+ foo64(m)
+}
+
+func foo70(mv1 *MV, m M) { // ERROR "leaking param: mv1" "leaking param: m"
+ m = mv1
+ foo64(m)
+}
+
+func foo71(x *int) []*int { // ERROR "leaking param: x"
+ var y []*int
+ y = append(y, x)
+ return y
+}
+
+func foo71a(x int) []*int { // ERROR "moved to heap: 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: 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: 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: x"
+ y[i] = &x // ERROR "&x escapes to heap"
+ }
+ return y
+}
+
+// issue 2145
+func foo73() {
+ s := []int{3, 2, 1} // ERROR "\[\]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"
+ println(vv) // ERROR "&vv escapes to heap"
+ }()
+ }
+}
+
+func foo74() {
+ s := []int{3, 2, 1} // ERROR "\[\]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"
+ println(vv) // ERROR "&vv escapes to heap"
+ }
+ defer fn()
+ }
+}
+
+// issue 3975
+func foo74b() {
+ var array [3]func()
+ s := []int{3, 2, 1} // ERROR "\[\]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) // ERROR "&vv escapes to heap"
+ }
+ }
+}
+
+func myprint(y *int, x ...interface{}) *int { // ERROR "x does not escape" "leaking param: y"
+ return y
+}
+
+func myprint1(y *int, x ...interface{}) *interface{} { // ERROR "y does not escape" "leaking param: x"
+ return &x[0] // ERROR "&x.0. escapes to heap"
+}
+
+func foo75(z *int) { // ERROR "z does not escape"
+ myprint(z, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
+}
+
+func foo75a(z *int) { // ERROR "z does not escape"
+ myprint1(z, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
+}
+
+func foo75esc(z *int) { // ERROR "leaking param: z"
+ gxx = myprint(z, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
+}
+
+func foo75aesc(z *int) { // ERROR "z does not escape"
+ var ppi **interface{} // assignments to pointer dereferences lose track
+ *ppi = myprint1(z, 1, 2, 3) // ERROR "[.][.][.] argument escapes to heap"
+}
+
+func foo76(z *int) { // ERROR "leaking param: z"
+ myprint(nil, z) // ERROR "[.][.][.] argument does not escape"
+}
+
+func foo76a(z *int) { // ERROR "leaking param: z"
+ myprint1(nil, z) // ERROR "[.][.][.] argument does not escape"
+}
+
+func foo76b() {
+ myprint(nil, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
+}
+
+func foo76c() {
+ myprint1(nil, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
+}
+
+func foo76d() {
+ defer myprint(nil, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
+}
+
+func foo76e() {
+ defer myprint1(nil, 1, 2, 3) // ERROR "[.][.][.] argument does not escape"
+}
+
+func foo76f() {
+ for {
+ // TODO: This one really only escapes its scope, but we don't distinguish yet.
+ defer myprint(nil, 1, 2, 3) // ERROR "[.][.][.] argument escapes to heap"
+ }
+}
+
+func foo76g() {
+ for {
+ defer myprint1(nil, 1, 2, 3) // ERROR "[.][.][.] argument escapes to heap"
+ }
+}
+
+func foo77(z []interface{}) { // ERROR "z does not escape"
+ myprint(nil, z...) // z does not escape
+}
+
+func foo77a(z []interface{}) { // ERROR "z does not escape"
+ myprint1(nil, z...)
+}
+
+func foo77b(z []interface{}) { // ERROR "leaking param: z"
+ var ppi **interface{}
+ *ppi = myprint1(nil, z...)
+}
+
+func foo78(z int) *int { // ERROR "moved to heap: z"
+ return &z // ERROR "&z escapes to heap"
+}
+
+func foo78a(z int) *int { // ERROR "moved to heap: z"
+ y := &z // ERROR "&z escapes to heap"
+ x := &y // ERROR "&y does not escape"
+ return *x // really return y
+}
+
+func foo79() *int {
+ return new(int) // ERROR "new[(]int[)] escapes to heap"
+}
+
+func foo80() *int {
+ var z *int
+ for {
+ // Really just escapes its scope but we don't distinguish
+ z = new(int) // ERROR "new[(]int[)] escapes to heap"
+ }
+ _ = z
+ return nil
+}
+
+func foo81() *int {
+ for {
+ z := new(int) // ERROR "new[(]int[)] does not escape"
+ _ = z
+ }
+ return nil
+}
+
+func tee(p *int) (x, y *int) { return p, p } // ERROR "leaking param"
+
+func noop(x, y *int) {} // ERROR "does not escape"
+
+func foo82() {
+ var x, y, z int // ERROR "moved to heap"
+ go noop(tee(&z)) // ERROR "&z escapes to heap"
+ go noop(&x, &y) // ERROR "escapes to heap"
+ for {
+ var u, v, w int // ERROR "moved to heap"
+ defer noop(tee(&u)) // ERROR "&u escapes to heap"
+ defer noop(&v, &w) // ERROR "escapes to heap"
+ }
+}
+
+type Fooer interface {
+ Foo()
+}
+
+type LimitedFooer struct {
+ Fooer
+ N int64
+}
+
+func LimitFooer(r Fooer, n int64) Fooer { // ERROR "leaking param: r"
+ return &LimitedFooer{r, n} // ERROR "&LimitedFooer literal escapes to heap"
+}
+
+func foo90(x *int) map[*int]*int { // ERROR "leaking param: x"
+ return map[*int]*int{nil: x} // ERROR "map\[\*int\]\*int literal escapes to heap"
+}
+
+func foo91(x *int) map[*int]*int { // ERROR "leaking param: x"
+ return map[*int]*int{x: nil} // ERROR "map\[\*int\]\*int literal escapes to heap"
+}
+
+func foo92(x *int) [2]*int { // ERROR "leaking param: x"
+ return [2]*int{x, nil}
+}
+
+// does not leak c
+func foo93(c chan *int) *int { // ERROR "c does not escape"
+ for v := range c {
+ return v
+ }
+ return nil
+}
+
+// does not leak m
+func foo94(m map[*int]*int, b bool) *int { // ERROR "m does not escape"
+ for k, v := range m {
+ if b {
+ return k
+ }
+ return v
+ }
+ return nil
+}
+
+// does leak x
+func foo95(m map[*int]*int, x *int) { // ERROR "m does not escape" "leaking param: x"
+ m[x] = x
+}
+
+// does not leak m
+func foo96(m []*int) *int { // ERROR "m does not escape"
+ return m[0]
+}
+
+// does leak m
+func foo97(m [1]*int) *int { // ERROR "leaking param: m"
+ return m[0]
+}
+
+// does not leak m
+func foo98(m map[int]*int) *int { // ERROR "m does not escape"
+ return m[0]
+}
+
+// does leak m
+func foo99(m *[1]*int) []*int { // ERROR "leaking param: m"
+ return m[:]
+}
+
+// does not leak m
+func foo100(m []*int) *int { // ERROR "m does not escape"
+ for _, v := range m {
+ return v
+ }
+ return nil
+}
+
+// does leak m
+func foo101(m [1]*int) *int { // ERROR "leaking param: m"
+ for _, v := range m {
+ return v
+ }
+ return nil
+}
+
+// does not leak m
+func foo101a(m [1]*int) *int { // ERROR "m does not escape"
+ for i := range m { // ERROR "moved to heap: i"
+ return &i // ERROR "&i escapes to heap"
+ }
+ return nil
+}
+
+// does leak x
+func foo102(m []*int, x *int) { // ERROR "m does not escape" "leaking param: x"
+ m[0] = x
+}
+
+// does not leak x
+func foo103(m [1]*int, x *int) { // ERROR "m does not escape" "x does not escape"
+ m[0] = x
+}
+
+var y []*int
+
+// does not leak x
+func foo104(x []*int) { // ERROR "x does not escape"
+ copy(y, x)
+}
+
+// does not leak x
+func foo105(x []*int) { // ERROR "x does not escape"
+ _ = append(y, x...)
+}
+
+// does leak x
+func foo106(x *int) { // ERROR "leaking param: x"
+ _ = append(y, x)
+}
+
+func foo107(x *int) map[*int]*int { // ERROR "leaking param: x"
+ return map[*int]*int{x: nil} // ERROR "map.* literal escapes to heap"
+}
+
+func foo108(x *int) map[*int]*int { // ERROR "leaking param: x"
+ return map[*int]*int{nil: x} // ERROR "map.* literal escapes to heap"
+}
+
+func foo109(x *int) *int { // ERROR "leaking param: x"
+ m := map[*int]*int{x: nil} // ERROR "map.* literal does not escape"
+ for k, _ := range m {
+ return k
+ }
+ return nil
+}
+
+func foo110(x *int) *int { // ERROR "leaking param: x"
+ m := map[*int]*int{nil: x} // ERROR "map.* literal does not escape"
+ return m[nil]
+}
+
+func foo111(x *int) *int { // ERROR "leaking param: x"
+ m := []*int{x} // ERROR "\[\]\*int literal does not escape"
+ return m[0]
+}
+
+func foo112(x *int) *int { // ERROR "leaking param: x"
+ m := [1]*int{x}
+ return m[0]
+}
+
+func foo113(x *int) *int { // ERROR "leaking param: x"
+ m := Bar{ii: x}
+ return m.ii
+}
+
+func foo114(x *int) *int { // ERROR "leaking param: x"
+ m := &Bar{ii: x} // ERROR "&Bar literal does not escape"
+ return m.ii
+}
+
+func foo115(x *int) *int { // ERROR "leaking param: x"
+ return (*int)(unsafe.Pointer(uintptr(unsafe.Pointer(x)) + 1))
+}
+
+func foo116(b bool) *int {
+ if b {
+ x := 1 // ERROR "moved to heap: x"
+ return &x // ERROR "&x escapes to heap"
+ } else {
+ y := 1 // ERROR "moved to heap: y"
+ return &y // ERROR "&y escapes to heap"
+ }
+ return nil
+}
+
+func foo117(unknown func(interface{})) { // ERROR "unknown does not escape"
+ x := 1 // ERROR "moved to heap: x"
+ unknown(&x) // ERROR "&x escapes to heap"
+}
+
+func foo118(unknown func(*int)) { // ERROR "unknown does not escape"
+ x := 1 // ERROR "moved to heap: x"
+ unknown(&x) // ERROR "&x escapes to heap"
+}
+
+func external(*int)
+
+func foo119(x *int) { // ERROR "leaking param: x"
+ external(x)
+}
+
+func foo120() {
+ // formerly exponential time analysis
+L1:
+L2:
+L3:
+L4:
+L5:
+L6:
+L7:
+L8:
+L9:
+L10:
+L11:
+L12:
+L13:
+L14:
+L15:
+L16:
+L17:
+L18:
+L19:
+L20:
+L21:
+L22:
+L23:
+L24:
+L25:
+L26:
+L27:
+L28:
+L29:
+L30:
+L31:
+L32:
+L33:
+L34:
+L35:
+L36:
+L37:
+L38:
+L39:
+L40:
+L41:
+L42:
+L43:
+L44:
+L45:
+L46:
+L47:
+L48:
+L49:
+L50:
+L51:
+L52:
+L53:
+L54:
+L55:
+L56:
+L57:
+L58:
+L59:
+L60:
+L61:
+L62:
+L63:
+L64:
+L65:
+L66:
+L67:
+L68:
+L69:
+L70:
+L71:
+L72:
+L73:
+L74:
+L75:
+L76:
+L77:
+L78:
+L79:
+L80:
+L81:
+L82:
+L83:
+L84:
+L85:
+L86:
+L87:
+L88:
+L89:
+L90:
+L91:
+L92:
+L93:
+L94:
+L95:
+L96:
+L97:
+L98:
+L99:
+L100:
+ // use the labels to silence compiler errors
+ goto L1
+ goto L2
+ goto L3
+ goto L4
+ goto L5
+ goto L6
+ goto L7
+ goto L8
+ goto L9
+ goto L10
+ goto L11
+ goto L12
+ goto L13
+ goto L14
+ goto L15
+ goto L16
+ goto L17
+ goto L18
+ goto L19
+ goto L20
+ goto L21
+ goto L22
+ goto L23
+ goto L24
+ goto L25
+ goto L26
+ goto L27
+ goto L28
+ goto L29
+ goto L30
+ goto L31
+ goto L32
+ goto L33
+ goto L34
+ goto L35
+ goto L36
+ goto L37
+ goto L38
+ goto L39
+ goto L40
+ goto L41
+ goto L42
+ goto L43
+ goto L44
+ goto L45
+ goto L46
+ goto L47
+ goto L48
+ goto L49
+ goto L50
+ goto L51
+ goto L52
+ goto L53
+ goto L54
+ goto L55
+ goto L56
+ goto L57
+ goto L58
+ goto L59
+ goto L60
+ goto L61
+ goto L62
+ goto L63
+ goto L64
+ goto L65
+ goto L66
+ goto L67
+ goto L68
+ goto L69
+ goto L70
+ goto L71
+ goto L72
+ goto L73
+ goto L74
+ goto L75
+ goto L76
+ goto L77
+ goto L78
+ goto L79
+ goto L80
+ goto L81
+ goto L82
+ goto L83
+ goto L84
+ goto L85
+ goto L86
+ goto L87
+ goto L88
+ goto L89
+ goto L90
+ goto L91
+ goto L92
+ goto L93
+ goto L94
+ goto L95
+ goto L96
+ goto L97
+ goto L98
+ goto L99
+ goto L100
+}
+
+func foo121() {
+ for i := 0; i < 10; i++ {
+ defer myprint(nil, i) // ERROR "[.][.][.] argument escapes to heap"
+ go myprint(nil, i) // ERROR "[.][.][.] argument escapes to heap"
+ }
+}
+
+// same as foo121 but check across import
+func foo121b() {
+ for i := 0; i < 10; i++ {
+ defer fmt.Printf("%d", i) // ERROR "[.][.][.] argument escapes to heap"
+ go fmt.Printf("%d", i) // ERROR "[.][.][.] argument escapes to heap"
+ }
+}
+
+// a harmless forward jump
+func foo122() {
+ var i *int
+
+ goto L1
+L1:
+ i = new(int) // ERROR "new.int. does not escape"
+ _ = i
+}
+
+// a backward jump, increases loopdepth
+func foo123() {
+ var i *int
+
+L1:
+ i = new(int) // ERROR "new.int. escapes to heap"
+
+ goto L1
+ _ = i
+}
+
+func foo124(x **int) { // ERROR "x does not escape"
+ var i int // ERROR "moved to heap: i"
+ p := &i // ERROR "&i escapes"
+ func() { // ERROR "func literal does not escape"
+ *x = p // ERROR "leaking closure reference p"
+ }()
+}
+
+func foo125(ch chan *int) { // ERROR "does not escape"
+ var i int // ERROR "moved to heap"
+ p := &i // ERROR "&i escapes to heap"
+ func() { // ERROR "func literal does not escape"
+ ch <- p // ERROR "leaking closure reference p"
+ }()
+}
+
+func foo126() {
+ var px *int // loopdepth 0
+ for {
+ // loopdepth 1
+ var i int // ERROR "moved to heap"
+ func() { // ERROR "func literal does not escape"
+ px = &i // ERROR "&i escapes"
+ }()
+ }
+ _ = px
+}
+
+var px *int
+
+func foo127() {
+ var i int // ERROR "moved to heap: i"
+ p := &i // ERROR "&i escapes to heap"
+ q := p
+ px = q
+}
+
+func foo128() {
+ var i int
+ p := &i // ERROR "&i does not escape"
+ q := p
+ _ = q
+}
+
+func foo129() {
+ var i int // ERROR "moved to heap: i"
+ p := &i // ERROR "&i escapes to heap"
+ func() { // ERROR "func literal does not escape"
+ q := p // ERROR "leaking closure reference p"
+ func() { // ERROR "func literal does not escape"
+ r := q // ERROR "leaking closure reference q"
+ px = r
+ }()
+ }()
+}
+
+func foo130() {
+ for {
+ var i int // ERROR "moved to heap"
+ func() { // ERROR "func literal does not escape"
+ px = &i // ERROR "&i escapes" "leaking closure reference i"
+ }()
+ }
+}
+
+func foo131() {
+ var i int // ERROR "moved to heap"
+ func() { // ERROR "func literal does not escape"
+ px = &i // ERROR "&i escapes" "leaking closure reference i"
+ }()
+}
+
+func foo132() {
+ var i int // ERROR "moved to heap"
+ go func() { // ERROR "func literal escapes to heap"
+ px = &i // ERROR "&i escapes" "leaking closure reference i"
+ }()
+}
+
+func foo133() {
+ var i int // ERROR "moved to heap"
+ defer func() { // ERROR "func literal does not escape"
+ px = &i // ERROR "&i escapes" "leaking closure reference i"
+ }()
+}
+
+func foo134() {
+ var i int
+ p := &i // ERROR "&i does not escape"
+ func() { // ERROR "func literal does not escape"
+ q := p
+ func() { // ERROR "func literal does not escape"
+ r := q
+ _ = r
+ }()
+ }()
+}
+
+func foo135() {
+ var i int // ERROR "moved to heap: i"
+ p := &i // ERROR "&i escapes to heap" "moved to heap: p"
+ go func() { // ERROR "func literal escapes to heap"
+ q := p // ERROR "&p escapes to heap"
+ func() { // ERROR "func literal does not escape"
+ r := q
+ _ = r
+ }()
+ }()
+}
+
+func foo136() {
+ var i int // ERROR "moved to heap: i"
+ p := &i // ERROR "&i escapes to heap" "moved to heap: p"
+ go func() { // ERROR "func literal escapes to heap"
+ q := p // ERROR "&p escapes to heap" "leaking closure reference p"
+ func() { // ERROR "func literal does not escape"
+ r := q // ERROR "leaking closure reference q"
+ px = r
+ }()
+ }()
+}
+
+func foo137() {
+ var i int // ERROR "moved to heap: i"
+ p := &i // ERROR "&i escapes to heap"
+ func() { // ERROR "func literal does not escape"
+ q := p // ERROR "leaking closure reference p" "moved to heap: q"
+ go func() { // ERROR "func literal escapes to heap"
+ r := q // ERROR "&q escapes to heap"
+ _ = r
+ }()
+ }()
+}
+
+func foo138() *byte {
+ type T struct {
+ x [1]byte
+ }
+ t := new(T) // ERROR "new.T. escapes to heap"
+ return &t.x[0] // ERROR "&t.x.0. escapes to heap"
+}
+
+func foo139() *byte {
+ type T struct {
+ x struct {
+ y byte
+ }
+ }
+ t := new(T) // ERROR "new.T. escapes to heap"
+ return &t.x.y // ERROR "&t.x.y escapes to heap"
+}
+
+// issue 4751
+func foo140() interface{} {
+ type T struct {
+ X string
+ }
+ type U struct {
+ X string
+ T *T
+ }
+ t := &T{} // ERROR "&T literal escapes to heap"
+ return U{
+ X: t.X,
+ T: t,
+ }
+}
+
+//go:noescape
+
+func F1([]byte)
+
+func F2([]byte)
+
+//go:noescape
+
+func F3(x []byte) // ERROR "F3 x does not escape"
+
+func F4(x []byte)
+
+func G() {
+ var buf1 [10]byte
+ F1(buf1[:]) // ERROR "buf1 does not escape"
+
+ var buf2 [10]byte // ERROR "moved to heap: buf2"
+ F2(buf2[:]) // ERROR "buf2 escapes to heap"
+
+ var buf3 [10]byte
+ F3(buf3[:]) // ERROR "buf3 does not escape"
+
+ var buf4 [10]byte // ERROR "moved to heap: buf4"
+ F4(buf4[:]) // ERROR "buf4 escapes to heap"
+}
+
+type Tm struct {
+ x int
+}
+
+func (t *Tm) M() { // ERROR "t does not escape"
+}
+
+func foo141() {
+ var f func()
+
+ t := new(Tm) // ERROR "escapes to heap"
+ f = t.M // ERROR "t.M does not escape"
+ _ = f
+}
+
+var gf func()
+
+func foo142() {
+ t := new(Tm) // ERROR "escapes to heap"
+ gf = t.M // ERROR "t.M escapes to heap"
+}
+
+// issue 3888.
+func foo143() {
+ for i := 0; i < 1000; i++ {
+ func() { // ERROR "func literal does not escape"
+ for i := 0; i < 1; i++ {
+ var t Tm
+ t.M() // ERROR "t does not escape"
+ }
+ }()
+ }
+}
+
+// issue 5773
+// Check that annotations take effect regardless of whether they
+// are before or after the use in the source code.
+
+//go:noescape
+
+func foo144a(*int)
+
+func foo144() {
+ var x int
+ foo144a(&x) // ERROR "&x does not escape"
+ var y int
+ foo144b(&y) // ERROR "&y does not escape"
+}
+
+//go:noescape
+
+func foo144b(*int)
+
+// issue 7313: for loop init should not be treated as "in loop"
+
+type List struct {
+ Next *List
+}
+
+func foo145(l List) { // ERROR "l does not escape"
+ var p *List
+ for p = &l; p.Next != nil; p = p.Next { // ERROR "&l does not escape"
+ }
+}
+
+func foo146(l List) { // ERROR "l does not escape"
+ var p *List
+ p = &l // ERROR "&l does not escape"
+ for ; p.Next != nil; p = p.Next {
+ }
+}
+
+func foo147(l List) { // ERROR "l does not escape"
+ var p *List
+ p = &l // ERROR "&l does not escape"
+ for p.Next != nil {
+ p = p.Next
+ }
+}
+
+func foo148(l List) { // ERROR " l does not escape"
+ for p := &l; p.Next != nil; p = p.Next { // ERROR "&l does not escape"
+ }
+}
+
+// related: address of variable should have depth of variable, not of loop
+
+func foo149(l List) { // ERROR " l does not escape"
+ var p *List
+ for {
+ for p = &l; p.Next != nil; p = p.Next { // ERROR "&l does not escape"
+ }
+ }
+}
+
+// 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]) // ERROR "&\(&a\)\[4:8\]\[0\] escapes to heap" "&a escapes to heap"
+}
+
+func bar151b() {
+ var a [10]int // ERROR "moved to heap: a"
+ b := a[:] // ERROR "a escapes to heap"
+ foo151(&b[4:8][0]) // ERROR "&b\[4:8\]\[0\] escapes to heap"
+}
+
+func bar151c() {
+ var a [64]int // ERROR "moved to heap: a"
+ a[4] = 101
+ foo151(&(&a)[4:8:8][0]) // ERROR "&\(&a\)\[4:8:8\]\[0\] escapes to heap" "&a escapes to heap"
+}
+
+func bar151d() {
+ var a [10]int // ERROR "moved to heap: a"
+ b := a[:] // ERROR "a escapes to heap"
+ foo151(&b[4:8:8][0]) // ERROR "&b\[4:8:8\]\[0\] escapes to heap"
+}
+
+// issue 8120
+
+type U struct {
+ s *string
+}
+
+func (u *U) String() *string { // ERROR "leaking param u content to result ~r0"
+ 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" "u does not escape"
+}
+
+func foo152() {
+ a := "a" // ERROR "moved to heap: a"
+ u := U{&a} // ERROR "&a escapes to heap"
+ v := NewV(u)
+ println(v)
+}
+
+// issue 8176 - &x in type switch body not marked as escaping
+
+func foo153(v interface{}) *int { // ERROR "leaking param: v"
+ switch x := v.(type) {
+ case int: // ERROR "moved to heap: x"
+ return &x // ERROR "&x escapes to heap"
+ }
+ panic(0)
+}
+
+// issue 8185 - &result escaping into result
+
+func f() (x int, y *int) { // ERROR "moved to heap: x"
+ y = &x // ERROR "&x escapes to heap"
+ return
+}
+
+func g() (x interface{}) { // ERROR "moved to heap: x"
+ x = &x // ERROR "&x escapes to heap"
+ return
+}
