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-rw-r--r--test/escape5.go282
1 files changed, 282 insertions, 0 deletions
diff --git a/test/escape5.go b/test/escape5.go
new file mode 100644
index 0000000..82be2c3
--- /dev/null
+++ b/test/escape5.go
@@ -0,0 +1,282 @@
+// errorcheck -0 -m -l
+
+// Copyright 2012 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.
+
+package foo
+
+import (
+ "runtime"
+ "unsafe"
+)
+
+func noleak(p *int) int { // ERROR "p does not escape"
+ return *p
+}
+
+func leaktoret(p *int) *int { // ERROR "leaking param: p to result"
+ return p
+}
+
+func leaktoret2(p *int) (*int, *int) { // ERROR "leaking param: p to result ~r1" "leaking param: p to result ~r2"
+ return p, p
+}
+
+func leaktoret22(p, q *int) (*int, *int) { // ERROR "leaking param: p to result ~r2" "leaking param: q to result ~r3"
+ return p, q
+}
+
+func leaktoret22b(p, q *int) (*int, *int) { // ERROR "leaking param: p to result ~r3" "leaking param: q to result ~r2"
+ return leaktoret22(q, p)
+}
+
+func leaktoret22c(p, q *int) (*int, *int) { // ERROR "leaking param: p to result ~r3" "leaking param: q to result ~r2"
+ r, s := leaktoret22(q, p)
+ return r, s
+}
+
+func leaktoret22d(p, q *int) (r, s *int) { // ERROR "leaking param: p to result s" "leaking param: q to result r"
+ r, s = leaktoret22(q, p)
+ return
+}
+
+func leaktoret22e(p, q *int) (r, s *int) { // ERROR "leaking param: p to result s" "leaking param: q to result r"
+ r, s = leaktoret22(q, p)
+ return r, s
+}
+
+func leaktoret22f(p, q *int) (r, s *int) { // ERROR "leaking param: p to result s" "leaking param: q to result r"
+ rr, ss := leaktoret22(q, p)
+ return rr, ss
+}
+
+var gp *int
+
+func leaktosink(p *int) *int { // ERROR "leaking param: p"
+ gp = p
+ return p
+}
+
+func f1() {
+ var x int
+ p := noleak(&x)
+ _ = p
+}
+
+func f2() {
+ var x int
+ p := leaktoret(&x)
+ _ = p
+}
+
+func f3() {
+ var x int // ERROR "moved to heap: x"
+ p := leaktoret(&x)
+ gp = p
+}
+
+func f4() {
+ var x int // ERROR "moved to heap: x"
+ p, q := leaktoret2(&x)
+ gp = p
+ gp = q
+}
+
+func f5() {
+ var x int
+ leaktoret22(leaktoret2(&x))
+}
+
+func f6() {
+ var x int // ERROR "moved to heap: x"
+ px1, px2 := leaktoret22(leaktoret2(&x))
+ gp = px1
+ _ = px2
+}
+
+type T struct{ x int }
+
+func (t *T) Foo(u int) (*T, bool) { // ERROR "leaking param: t to result"
+ t.x += u
+ return t, true
+}
+
+func f7() *T {
+ r, _ := new(T).Foo(42) // ERROR "new.T. escapes to heap"
+ return r
+}
+
+func leakrecursive1(p, q *int) (*int, *int) { // ERROR "leaking param: p" "leaking param: q"
+ return leakrecursive2(q, p)
+}
+
+func leakrecursive2(p, q *int) (*int, *int) { // ERROR "leaking param: p" "leaking param: q"
+ if *p > *q {
+ return leakrecursive1(q, p)
+ }
+ // without this, leakrecursive? are safe for p and q, b/c in fact their graph does not have leaking edges.
+ return p, q
+}
+
+var global interface{}
+
+type T1 struct {
+ X *int
+}
+
+type T2 struct {
+ Y *T1
+}
+
+func f8(p *T1) (k T2) { // ERROR "leaking param: p$"
+ if p == nil {
+ k = T2{}
+ return
+ }
+
+ // should make p leak always
+ global = p
+ return T2{p}
+}
+
+func f9() {
+ var j T1 // ERROR "moved to heap: j"
+ f8(&j)
+}
+
+func f10() {
+ // These don't escape but are too big for the stack
+ var x [1 << 30]byte // ERROR "moved to heap: x"
+ var y = make([]byte, 1<<30) // ERROR "make\(\[\]byte, 1 << 30\) escapes to heap"
+ _ = x[0] + y[0]
+}
+
+// Test for issue 19687 (passing to unnamed parameters does not escape).
+func f11(**int) {
+}
+func f12(_ **int) {
+}
+func f13() {
+ var x *int
+ f11(&x)
+ f12(&x)
+ runtime.KeepAlive(&x)
+}
+
+// Test for issue 24305 (passing to unnamed receivers does not escape).
+type U int
+
+func (*U) M() {}
+func (_ *U) N() {}
+
+func _() {
+ var u U
+ u.M()
+ u.N()
+}
+
+func fbad24305() {
+ // BAD u should not be heap allocated
+ var u U // ERROR "moved to heap: u"
+ (*U).M(&u)
+ (*U).N(&u)
+}
+
+// Issue 24730: taking address in a loop causes unnecessary escape
+type T24730 struct {
+ x [64]byte
+}
+
+func (t *T24730) g() { // ERROR "t does not escape"
+ y := t.x[:]
+ for i := range t.x[:] {
+ y = t.x[:]
+ y[i] = 1
+ }
+
+ var z *byte
+ for i := range t.x[:] {
+ z = &t.x[i]
+ *z = 2
+ }
+}
+
+// Issue 15730: copy causes unnecessary escape
+
+var sink []byte
+var sink2 []int
+var sink3 []*int
+
+func f15730a(args ...interface{}) { // ERROR "args does not escape"
+ for _, arg := range args {
+ switch a := arg.(type) {
+ case string:
+ copy(sink, a)
+ }
+ }
+}
+
+func f15730b(args ...interface{}) { // ERROR "args does not escape"
+ for _, arg := range args {
+ switch a := arg.(type) {
+ case []int:
+ copy(sink2, a)
+ }
+ }
+}
+
+func f15730c(args ...interface{}) { // ERROR "leaking param content: args"
+ for _, arg := range args {
+ switch a := arg.(type) {
+ case []*int:
+ // copy pointerful data should cause escape
+ copy(sink3, a)
+ }
+ }
+}
+
+// Issue 29000: unnamed parameter is not handled correctly
+
+var sink4 interface{}
+var alwaysFalse = false
+
+func f29000(_ int, x interface{}) { // ERROR "leaking param: x"
+ sink4 = x
+ if alwaysFalse {
+ g29000()
+ }
+}
+
+func g29000() {
+ x := 1
+ f29000(2, x) // ERROR "x escapes to heap"
+}
+
+// Issue 28369: taking an address of a parameter and converting it into a uintptr causes an
+// unnecessary escape.
+
+var sink28369 uintptr
+
+func f28369(n int) int {
+ if n == 0 {
+ sink28369 = uintptr(unsafe.Pointer(&n))
+ return n
+ }
+
+ return 1 + f28369(n-1)
+}
+
+// Issue 44614: parameters that flow to a heap-allocated result
+// parameter must be recorded as a heap-flow rather than a
+// result-flow.
+
+// N.B., must match "leaking param: p",
+// but *not* "leaking param: p to result r level=0".
+func f(p *int) (r *int) { // ERROR "leaking param: p$" "moved to heap: r"
+ sink4 = &r
+ return p
+}