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-rw-r--r--test/fixedbugs/issue12006.go174
1 files changed, 174 insertions, 0 deletions
diff --git a/test/fixedbugs/issue12006.go b/test/fixedbugs/issue12006.go
new file mode 100644
index 0000000..e878bc4
--- /dev/null
+++ b/test/fixedbugs/issue12006.go
@@ -0,0 +1,174 @@
+// errorcheck -0 -m -l
+
+// Copyright 2015 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 escape analysis through ... parameters.
+
+package foo
+
+func FooN(vals ...*int) (s int) { // ERROR "vals does not escape"
+ for _, v := range vals {
+ s += *v
+ }
+ return s
+}
+
+// Append forces heap allocation and copies entries in vals to heap, therefore they escape to heap.
+func FooNx(x *int, vals ...*int) (s int) { // ERROR "leaking param: x" "leaking param content: vals"
+ vals = append(vals, x)
+ return FooN(vals...)
+}
+
+var sink []*int
+
+func FooNy(x *int, vals ...*int) (s int) { // ERROR "leaking param: x" "leaking param: vals"
+ vals = append(vals, x)
+ sink = vals
+ return FooN(vals...)
+}
+
+func FooNz(vals ...*int) (s int) { // ERROR "leaking param: vals"
+ sink = vals
+ return FooN(vals...)
+}
+
+func TFooN() {
+ for i := 0; i < 1000; i++ {
+ var i, j int
+ FooN(&i, &j) // ERROR "... argument does not escape"
+ }
+}
+
+func TFooNx() {
+ for i := 0; i < 1000; i++ {
+ var i, j, k int // ERROR "moved to heap: i" "moved to heap: j" "moved to heap: k"
+ FooNx(&k, &i, &j) // ERROR "... argument does not escape"
+ }
+}
+
+func TFooNy() {
+ for i := 0; i < 1000; i++ {
+ var i, j, k int // ERROR "moved to heap: i" "moved to heap: j" "moved to heap: k"
+ FooNy(&k, &i, &j) // ERROR "... argument escapes to heap"
+ }
+}
+
+func TFooNz() {
+ for i := 0; i < 1000; i++ {
+ var i, j int // ERROR "moved to heap: i" "moved to heap: j"
+ FooNz(&i, &j) // ERROR "... argument escapes to heap"
+ }
+}
+
+var isink *int32
+
+func FooI(args ...interface{}) { // ERROR "leaking param content: args"
+ for i := 0; i < len(args); i++ {
+ switch x := args[i].(type) {
+ case nil:
+ println("is nil")
+ case int32:
+ println("is int32")
+ case *int32:
+ println("is *int32")
+ isink = x
+ case string:
+ println("is string")
+ }
+ }
+}
+
+func TFooI() {
+ a := int32(1) // ERROR "moved to heap: a"
+ b := "cat"
+ c := &a
+ FooI(a, b, c) // ERROR "a escapes to heap" "b escapes to heap" "... argument does not escape"
+}
+
+func FooJ(args ...interface{}) *int32 { // ERROR "leaking param: args to result ~r0 level=1"
+ for i := 0; i < len(args); i++ {
+ switch x := args[i].(type) {
+ case nil:
+ println("is nil")
+ case int32:
+ println("is int32")
+ case *int32:
+ println("is *int32")
+ return x
+ case string:
+ println("is string")
+ }
+ }
+ return nil
+}
+
+func TFooJ1() {
+ a := int32(1)
+ b := "cat"
+ c := &a
+ FooJ(a, b, c) // ERROR "a does not escape" "b does not escape" "... argument does not escape"
+}
+
+func TFooJ2() {
+ a := int32(1) // ERROR "moved to heap: a"
+ b := "cat"
+ c := &a
+ isink = FooJ(a, b, c) // ERROR "a escapes to heap" "b escapes to heap" "... argument does not escape"
+}
+
+type fakeSlice struct {
+ l int
+ a *[4]interface{}
+}
+
+func FooK(args fakeSlice) *int32 { // ERROR "leaking param: args to result ~r0 level=1"
+ for i := 0; i < args.l; i++ {
+ switch x := (*args.a)[i].(type) {
+ case nil:
+ println("is nil")
+ case int32:
+ println("is int32")
+ case *int32:
+ println("is *int32")
+ return x
+ case string:
+ println("is string")
+ }
+ }
+ return nil
+}
+
+func TFooK2() {
+ a := int32(1) // ERROR "moved to heap: a"
+ b := "cat"
+ c := &a
+ fs := fakeSlice{3, &[4]interface{}{a, b, c, nil}} // ERROR "a escapes to heap" "b escapes to heap" "&\[4\]interface {}{...} does not escape"
+ isink = FooK(fs)
+}
+
+func FooL(args []interface{}) *int32 { // ERROR "leaking param: args to result ~r0 level=1"
+ for i := 0; i < len(args); i++ {
+ switch x := args[i].(type) {
+ case nil:
+ println("is nil")
+ case int32:
+ println("is int32")
+ case *int32:
+ println("is *int32")
+ return x
+ case string:
+ println("is string")
+ }
+ }
+ return nil
+}
+
+func TFooL2() {
+ a := int32(1) // ERROR "moved to heap: a"
+ b := "cat"
+ c := &a
+ s := []interface{}{a, b, c} // ERROR "a escapes to heap" "b escapes to heap" "\[\]interface {}{...} does not escape"
+ isink = FooL(s)
+}