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![Tal Shprecher](/assets/img/avatar_default.png)
This is a followup to issue #13805. That change avoid leaks for types that don't have any pointers for the single assignment form of a dottype expression. This does the same for the double assignment form. Fixes #15796 Change-Id: I27474cade0ff1f3025cb6392f47b87b33542bc0f Reviewed-on: https://go-review.googlesource.com/24906 Run-TryBot: Michael Matloob <matloob@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com>
262 lines
6.1 KiB
Go
262 lines
6.1 KiB
Go
// errorcheck -0 -m -l
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test escape analysis for interface conversions.
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package escape
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var sink interface{}
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type M interface {
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M()
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}
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func mescapes(m M) { // ERROR "leaking param: m"
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sink = m // ERROR "m escapes to heap"
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}
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func mdoesnotescape(m M) { // ERROR "m does not escape"
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}
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// Tests for type stored directly in iface and with value receiver method.
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type M0 struct {
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p *int
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}
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func (M0) M() {
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}
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func efaceEscape0() {
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{
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i := 0
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v := M0{&i} // ERROR "&i does not escape"
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var x M = v // ERROR "v does not escape"
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_ = x
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}
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{
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i := 0 // ERROR "moved to heap: i"
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v := M0{&i} // ERROR "&i escapes to heap"
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var x M = v // ERROR "v escapes to heap"
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sink = x // ERROR "x escapes to heap"
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}
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{
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i := 0
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v := M0{&i} // ERROR "&i does not escape"
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var x M = v // ERROR "v does not escape"
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v1 := x.(M0)
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_ = v1
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}
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{
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i := 0 // ERROR "moved to heap: i"
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v := M0{&i} // ERROR "&i escapes to heap"
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// BAD: v does not escape to heap here
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var x M = v // ERROR "v escapes to heap"
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v1 := x.(M0)
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sink = v1 // ERROR "v1 escapes to heap"
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}
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{
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i := 0 // ERROR "moved to heap: i"
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v := M0{&i} // ERROR "&i escapes to heap"
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// BAD: v does not escape to heap here
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var x M = v // ERROR "v escapes to heap"
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x.M()
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}
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{
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i := 0 // ERROR "moved to heap: i"
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v := M0{&i} // ERROR "&i escapes to heap"
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var x M = v // ERROR "v escapes to heap"
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mescapes(x)
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}
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{
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i := 0
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v := M0{&i} // ERROR "&i does not escape"
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var x M = v // ERROR "v does not escape"
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mdoesnotescape(x)
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}
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}
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// Tests for type stored indirectly in iface and with value receiver method.
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type M1 struct {
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p *int
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x int
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}
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func (M1) M() {
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}
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func efaceEscape1() {
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{
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i := 0
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v := M1{&i, 0} // ERROR "&i does not escape"
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var x M = v // ERROR "v does not escape"
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_ = x
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}
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{
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i := 0 // ERROR "moved to heap: i"
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v := M1{&i, 0} // ERROR "&i escapes to heap"
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var x M = v // ERROR "v escapes to heap"
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sink = x // ERROR "x escapes to heap"
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}
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{
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i := 0
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v := M1{&i, 0} // ERROR "&i does not escape"
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var x M = v // ERROR "v does not escape"
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v1 := x.(M1)
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_ = v1
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}
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{
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i := 0 // ERROR "moved to heap: i"
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v := M1{&i, 0} // ERROR "&i escapes to heap"
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// BAD: v does not escape to heap here
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var x M = v // ERROR "v escapes to heap"
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v1 := x.(M1)
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sink = v1 // ERROR "v1 escapes to heap"
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}
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{
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i := 0 // ERROR "moved to heap: i"
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v := M1{&i, 0} // ERROR "&i escapes to heap"
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// BAD: v does not escape to heap here
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var x M = v // ERROR "v escapes to heap"
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x.M()
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}
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{
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i := 0 // ERROR "moved to heap: i"
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v := M1{&i, 0} // ERROR "&i escapes to heap"
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var x M = v // ERROR "v escapes to heap"
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mescapes(x)
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}
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{
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i := 0
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v := M1{&i, 0} // ERROR "&i does not escape"
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var x M = v // ERROR "v does not escape"
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mdoesnotescape(x)
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}
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}
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// Tests for type stored directly in iface and with pointer receiver method.
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type M2 struct {
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p *int
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}
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func (*M2) M() {
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}
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func efaceEscape2() {
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{
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i := 0
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v := &M2{&i} // ERROR "&i does not escape" "&M2 literal does not escape"
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var x M = v // ERROR "v does not escape"
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_ = x
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}
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{
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i := 0 // ERROR "moved to heap: i"
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v := &M2{&i} // ERROR "&i escapes to heap" "&M2 literal escapes to heap"
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var x M = v // ERROR "v escapes to heap"
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sink = x // ERROR "x escapes to heap"
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}
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{
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i := 0
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v := &M2{&i} // ERROR "&i does not escape" "&M2 literal does not escape"
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var x M = v // ERROR "v does not escape"
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v1 := x.(*M2)
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_ = v1
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}
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{
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i := 0 // ERROR "moved to heap: i"
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v := &M2{&i} // ERROR "&i escapes to heap" "&M2 literal escapes to heap"
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// BAD: v does not escape to heap here
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var x M = v // ERROR "v escapes to heap"
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v1 := x.(*M2)
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sink = v1 // ERROR "v1 escapes to heap"
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}
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{
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i := 0 // ERROR "moved to heap: i"
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v := &M2{&i} // ERROR "&i escapes to heap" "&M2 literal does not escape"
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// BAD: v does not escape to heap here
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var x M = v // ERROR "v does not escape"
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v1 := x.(*M2)
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sink = *v1 // ERROR "v1 escapes to heap"
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}
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{
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i := 0 // ERROR "moved to heap: i"
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v := &M2{&i} // ERROR "&i escapes to heap" "&M2 literal does not escape"
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// BAD: v does not escape to heap here
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var x M = v // ERROR "v does not escape"
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v1, ok := x.(*M2)
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sink = *v1 // ERROR "v1 escapes to heap"
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_ = ok
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}
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{
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i := 0 // ERROR "moved to heap: i"
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v := &M2{&i} // ERROR "&i escapes to heap" "&M2 literal escapes to heap"
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// BAD: v does not escape to heap here
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var x M = v // ERROR "v escapes to heap"
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x.M()
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}
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{
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i := 0 // ERROR "moved to heap: i"
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v := &M2{&i} // ERROR "&i escapes to heap" "&M2 literal escapes to heap"
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var x M = v // ERROR "v escapes to heap"
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mescapes(x)
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}
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{
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i := 0
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v := &M2{&i} // ERROR "&i does not escape" "&M2 literal does not escape"
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var x M = v // ERROR "v does not escape"
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mdoesnotescape(x)
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}
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}
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type T1 struct {
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p *int
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}
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type T2 struct {
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T1 T1
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}
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func dotTypeEscape() *T2 { // #11931
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var x interface{}
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x = &T1{p: new(int)} // ERROR "new\(int\) escapes to heap" "&T1 literal does not escape"
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return &T2{
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T1: *(x.(*T1)), // ERROR "&T2 literal escapes to heap"
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}
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}
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func dotTypeEscape2() { // #13805, #15796
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{
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i := 0
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j := 0
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var v int
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var ok bool
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var x interface{} = i // ERROR "i does not escape"
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var y interface{} = j // ERROR "j does not escape"
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*(&v) = x.(int) // ERROR "&v does not escape"
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*(&v), *(&ok) = y.(int) // ERROR "&v does not escape" "&ok does not escape"
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}
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{
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i := 0
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j := 0
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var ok bool
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var x interface{} = i // ERROR "i does not escape"
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var y interface{} = j // ERROR "j does not escape"
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sink = x.(int) // ERROR "x.\(int\) escapes to heap"
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sink, *(&ok) = y.(int) // ERROR "&ok does not escape"
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}
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{
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i := 0 // ERROR "moved to heap: i"
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j := 0 // ERROR "moved to heap: j"
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var ok bool
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var x interface{} = &i // ERROR "&i escapes to heap"
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var y interface{} = &j // ERROR "&j escapes to heap"
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sink = x.(*int) // ERROR "x.\(\*int\) escapes to heap"
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sink, *(&ok) = y.(*int) // ERROR "&ok does not escape"
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}
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}
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