mirror of
https://github.com/golang/go
synced 2024-11-25 01:27:56 -07:00
745cdc3ad7
The existing test did not take into account the implicit dereference of &fixedArray and thus heap-escaped when it was not necessary. Also added a detailed test for this and related cases. Fixes #12588 Change-Id: I951e9684a093082ccdca47710f69f4366bd6b3cf Reviewed-on: https://go-review.googlesource.com/15130 Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
89 lines
2.0 KiB
Go
89 lines
2.0 KiB
Go
// 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.
|
|
|
|
// Tests escape analysis for range of arrays.
|
|
// Compiles but need not run. Inlining is disabled.
|
|
|
|
package main
|
|
|
|
type A struct {
|
|
b [3]uint64
|
|
}
|
|
|
|
type B struct {
|
|
b [3]*uint64
|
|
}
|
|
|
|
func f(a A) int {
|
|
for i, x := range &a.b { // ERROR "f &a.b does not escape"
|
|
if x != 0 {
|
|
return 64*i + int(x)
|
|
}
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func g(a *A) int { // ERROR "g a does not escape"
|
|
for i, x := range &a.b { // ERROR "g &a.b does not escape"
|
|
if x != 0 {
|
|
return 64*i + int(x)
|
|
}
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func h(a *B) *uint64 { // ERROR "leaking param: a to result ~r1 level=1"
|
|
for i, x := range &a.b { // ERROR "h &a.b does not escape"
|
|
if i == 0 {
|
|
return x
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func h2(a *B) *uint64 { // ERROR "leaking param: a to result ~r1 level=1"
|
|
p := &a.b // ERROR "h2 &a.b does not escape"
|
|
for i, x := range p {
|
|
if i == 0 {
|
|
return x
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Seems like below should be level=1, not 0.
|
|
func k(a B) *uint64 { // ERROR "leaking param: a to result ~r1 level=0"
|
|
for i, x := range &a.b { // ERROR "k &a.b does not escape"
|
|
if i == 0 {
|
|
return x
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
var sink *uint64
|
|
|
|
func main() {
|
|
var a1, a2 A
|
|
var b1, b2, b3, b4 B
|
|
var x1, x2, x3, x4 uint64 // ERROR "moved to heap: x1" "moved to heap: x3"
|
|
b1.b[0] = &x1 // ERROR "&x1 escapes to heap"
|
|
b2.b[0] = &x2 // ERROR "main &x2 does not escape"
|
|
b3.b[0] = &x3 // ERROR "&x3 escapes to heap"
|
|
b4.b[0] = &x4 // ERROR "main &x4 does not escape"
|
|
f(a1)
|
|
g(&a2) // ERROR "main &a2 does not escape"
|
|
sink = h(&b1) // ERROR "main &b1 does not escape"
|
|
h(&b2) // ERROR "main &b2 does not escape"
|
|
sink = h2(&b1) // ERROR "main &b1 does not escape"
|
|
h2(&b4) // ERROR "main &b4 does not escape"
|
|
x1 = 17
|
|
println("*sink=", *sink) // Verify that sink addresses x1
|
|
x3 = 42
|
|
sink = k(b3)
|
|
println("*sink=", *sink) // Verify that sink addresses x3
|
|
}
|