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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 for slices.
package escape
import (
"os"
"strings"
)
var sink interface{}
func slice0() {
var s []*int
// BAD: i should not escape
i := 0 // ERROR "moved to heap: i"
s = append(s, &i)
_ = s
}
func slice1() *int {
var s []*int
i := 0 // ERROR "moved to heap: i"
s = append(s, &i)
return s[0]
}
func slice2() []*int {
var s []*int
i := 0 // ERROR "moved to heap: i"
s = append(s, &i)
return s
}
func slice3() *int {
var s []*int
i := 0 // ERROR "moved to heap: i"
s = append(s, &i)
for _, p := range s {
return p
}
return nil
}
func slice4(s []*int) { // ERROR "s does not escape"
i := 0 // ERROR "moved to heap: i"
s[0] = &i
}
func slice5(s []*int) { // ERROR "s does not escape"
if s != nil {
s = make([]*int, 10) // ERROR "make\(\[\]\*int, 10\) does not escape"
}
i := 0 // ERROR "moved to heap: i"
s[0] = &i
}
func slice6() {
s := make([]*int, 10) // ERROR "make\(\[\]\*int, 10\) does not escape"
// BAD: i should not escape
i := 0 // ERROR "moved to heap: i"
s[0] = &i
_ = s
}
func slice7() *int {
s := make([]*int, 10) // ERROR "make\(\[\]\*int, 10\) does not escape"
i := 0 // ERROR "moved to heap: i"
s[0] = &i
return s[0]
}
func slice8() {
i := 0
s := []*int{&i} // ERROR "\[\]\*int{...} does not escape"
_ = s
}
func slice9() *int {
i := 0 // ERROR "moved to heap: i"
s := []*int{&i} // ERROR "\[\]\*int{...} does not escape"
return s[0]
}
func slice10() []*int {
i := 0 // ERROR "moved to heap: i"
s := []*int{&i} // ERROR "\[\]\*int{...} escapes to heap"
return s
}
func slice11() {
i := 2
s := make([]int, 2, 3) // ERROR "make\(\[\]int, 2, 3\) does not escape"
s = make([]int, i, 3) // ERROR "make\(\[\]int, i, 3\) does not escape"
s = make([]int, i, 1) // ERROR "make\(\[\]int, i, 1\) does not escape"
_ = s
}
func slice12(x []int) *[1]int { // ERROR "leaking param: x to result ~r0 level=0$"
return (*[1]int)(x)
}
func slice13(x []*int) [1]*int { // ERROR "leaking param: x to result ~r0 level=1$"
return [1]*int(x)
}
func envForDir(dir string) []string { // ERROR "dir does not escape"
env := os.Environ()
return mergeEnvLists([]string{"PWD=" + dir}, env) // ERROR ".PWD=. \+ dir escapes to heap" "\[\]string{...} does not escape"
}
func mergeEnvLists(in, out []string) []string { // ERROR "leaking param content: in" "leaking param content: out" "leaking param: out to result ~r0 level=0"
NextVar:
for _, inkv := range in {
k := strings.SplitAfterN(inkv, "=", 2)[0]
for i, outkv := range out {
if strings.HasPrefix(outkv, k) {
out[i] = inkv
continue NextVar
}
}
out = append(out, inkv)
}
return out
}
const (
IPv4len = 4
IPv6len = 16
)
var v4InV6Prefix = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff}
func IPv4(a, b, c, d byte) IP {
p := make(IP, IPv6len) // ERROR "make\(IP, 16\) escapes to heap"
copy(p, v4InV6Prefix)
p[12] = a
p[13] = b
p[14] = c
p[15] = d
return p
}
type IP []byte
type IPAddr struct {
IP IP
Zone string // IPv6 scoped addressing zone
}
type resolveIPAddrTest struct {
network string
litAddrOrName string
addr *IPAddr
err error
}
var resolveIPAddrTests = []resolveIPAddrTest{
{"ip", "127.0.0.1", &IPAddr{IP: IPv4(127, 0, 0, 1)}, nil},
{"ip4", "127.0.0.1", &IPAddr{IP: IPv4(127, 0, 0, 1)}, nil},
{"ip4:icmp", "127.0.0.1", &IPAddr{IP: IPv4(127, 0, 0, 1)}, nil},
}
func setupTestData() {
resolveIPAddrTests = append(resolveIPAddrTests,
[]resolveIPAddrTest{ // ERROR "\[\]resolveIPAddrTest{...} does not escape"
{"ip",
"localhost",
&IPAddr{IP: IPv4(127, 0, 0, 1)}, // ERROR "&IPAddr{...} escapes to heap"
nil},
{"ip4",
"localhost",
&IPAddr{IP: IPv4(127, 0, 0, 1)}, // ERROR "&IPAddr{...} escapes to heap"
nil},
}...)
}