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// 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 with respect to field assignments.
package escape
var sink interface{}
type X struct {
p1 *int
p2 *int
a [2]*int
}
type Y struct {
x X
}
func field0() {
i := 0 // ERROR "moved to heap: i$"
var x X
x.p1 = &i
sink = x.p1
}
func field1() {
i := 0 // ERROR "moved to heap: i$"
var x X
// BAD: &i should not escape
x.p1 = &i
sink = x.p2
}
func field3() {
i := 0 // ERROR "moved to heap: i$"
var x X
x.p1 = &i
sink = x // ERROR "x escapes to heap"
}
func field4() {
i := 0 // ERROR "moved to heap: i$"
var y Y
y.x.p1 = &i
x := y.x
sink = x // ERROR "x escapes to heap"
}
func field5() {
i := 0 // ERROR "moved to heap: i$"
var x X
// BAD: &i should not escape here
x.a[0] = &i
sink = x.a[1]
}
// BAD: we are not leaking param x, only x.p2
func field6(x *X) { // ERROR "leaking param content: x$"
sink = x.p2
}
func field6a() {
i := 0 // ERROR "moved to heap: i$"
var x X
// BAD: &i should not escape
x.p1 = &i
field6(&x)
}
func field7() {
i := 0
var y Y
y.x.p1 = &i
x := y.x
var y1 Y
y1.x = x
_ = y1.x.p1
}
func field8() {
i := 0 // ERROR "moved to heap: i$"
var y Y
y.x.p1 = &i
x := y.x
var y1 Y
y1.x = x
sink = y1.x.p1
}
func field9() {
i := 0 // ERROR "moved to heap: i$"
var y Y
y.x.p1 = &i
x := y.x
var y1 Y
y1.x = x
sink = y1.x // ERROR "y1\.x escapes to heap"
}
func field10() {
i := 0 // ERROR "moved to heap: i$"
var y Y
// BAD: &i should not escape
y.x.p1 = &i
x := y.x
var y1 Y
y1.x = x
sink = y1.x.p2
}
func field11() {
i := 0 // ERROR "moved to heap: i$"
x := X{p1: &i}
sink = x.p1
}
func field12() {
i := 0 // ERROR "moved to heap: i$"
// BAD: &i should not escape
x := X{p1: &i}
sink = x.p2
}
func field13() {
i := 0 // ERROR "moved to heap: i$"
x := &X{p1: &i} // ERROR "&X{...} does not escape$"
sink = x.p1
}
func field14() {
i := 0 // ERROR "moved to heap: i$"
// BAD: &i should not escape
x := &X{p1: &i} // ERROR "&X{...} does not escape$"
sink = x.p2
}
func field15() {
i := 0 // ERROR "moved to heap: i$"
x := &X{p1: &i} // ERROR "&X{...} escapes to heap$"
sink = x
}
func field16() {
i := 0 // ERROR "moved to heap: i$"
var x X
// BAD: &i should not escape
x.p1 = &i
var iface interface{} = x // ERROR "x does not escape"
x1 := iface.(X)
sink = x1.p2
}
func field17() {
i := 0 // ERROR "moved to heap: i$"
var x X
x.p1 = &i
var iface interface{} = x // ERROR "x does not escape"
x1 := iface.(X)
sink = x1.p1
}
func field18() {
i := 0 // ERROR "moved to heap: i$"
var x X
// BAD: &i should not escape
x.p1 = &i
var iface interface{} = x // ERROR "x does not escape"
y, _ := iface.(Y) // Put X, but extracted Y. The cast will fail, so y is zero initialized.
sink = y // ERROR "y escapes to heap"
}