mirror of
https://github.com/golang/go
synced 2024-11-26 17:56:55 -07:00
391425ae55
heuristic to not print bogus strings. fix one error message format. R=ken OCL=23849 CL=23851
176 lines
3.1 KiB
Go
176 lines
3.1 KiB
Go
// $G $D/$F.go && $L $F.$A && ./$A.out
|
|
|
|
// Copyright 2009 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.
|
|
|
|
package main
|
|
|
|
// check for correct heap-moving of escaped variables.
|
|
// it is hard to check for the allocations, but it is easy
|
|
// to check that if you call the function twice at the
|
|
// same stack level, the pointers returned should be
|
|
// different.
|
|
|
|
var bad = false
|
|
|
|
var allptr = make([]*int, 0, 100);
|
|
|
|
func noalias(p, q *int, s string) {
|
|
n := len(allptr);
|
|
*p = -(n+1);
|
|
*q = -(n+2);
|
|
allptr = allptr[0:n+2];
|
|
allptr[n] = p;
|
|
allptr[n+1] = q;
|
|
n += 2;
|
|
for i := 0; i < n; i++ {
|
|
if allptr[i] != nil && *allptr[i] != -(i+1) {
|
|
println("aliased pointers", -(i+1), *allptr[i], "after", s);
|
|
allptr[i] = nil;
|
|
bad = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
func val(p, q *int, v int, s string) {
|
|
if *p != v {
|
|
println("wrong value want", v, "got", *p, "after", s);
|
|
bad = true;
|
|
}
|
|
if *q != v+1 {
|
|
println("wrong value want", v+1, "got", *q, "after", s);
|
|
bad = true;
|
|
}
|
|
}
|
|
|
|
func chk(p, q *int, v int, s string) {
|
|
val(p, q, v, s);
|
|
noalias(p, q, s);
|
|
}
|
|
|
|
func chkalias(p, q *int, v int, s string) {
|
|
if p != q {
|
|
println("want aliased pointers but got different after", s);
|
|
}
|
|
if *q != v+1 {
|
|
println("wrong value want", v+1, "got", *q, "after", s);
|
|
}
|
|
}
|
|
|
|
func i_escapes(x int) *int {
|
|
var i int;
|
|
i = x;
|
|
return &i;
|
|
}
|
|
|
|
func j_escapes(x int) *int {
|
|
var j int = x;
|
|
j = x;
|
|
return &j;
|
|
}
|
|
|
|
func k_escapes(x int) *int {
|
|
k := x;
|
|
return &k;
|
|
}
|
|
|
|
func in_escapes(x int) *int {
|
|
return &x;
|
|
}
|
|
|
|
func send(c chan int, x int) {
|
|
c <- x;
|
|
}
|
|
|
|
func select_escapes(x int) *int {
|
|
c := make(chan int);
|
|
go send(c, x);
|
|
select {
|
|
case req := <-c:
|
|
return &req;
|
|
}
|
|
return nil;
|
|
}
|
|
|
|
func select_escapes1(x int, y int) (*int, *int) {
|
|
c := make(chan int);
|
|
var a [2]int;
|
|
var p [2]*int;
|
|
a[0] = x;
|
|
a[1] = y;
|
|
for i := 0; i < 2; i++ {
|
|
go send(c, a[i]);
|
|
select {
|
|
case req := <-c:
|
|
p[i] = &req;
|
|
}
|
|
}
|
|
return p[0], p[1]
|
|
}
|
|
|
|
func range_escapes(x int) *int {
|
|
var a [1]int;
|
|
a[0] = x;
|
|
for k, v := range a {
|
|
return &v;
|
|
}
|
|
return nil;
|
|
}
|
|
|
|
// *is* aliased
|
|
func range_escapes2(x, y int) (*int, *int) {
|
|
var a [2]int;
|
|
var p [2]*int;
|
|
a[0] = x;
|
|
a[1] = y;
|
|
for k, v := range a {
|
|
p[k] = &v;
|
|
}
|
|
return p[0], p[1]
|
|
}
|
|
|
|
// *is* aliased
|
|
func for_escapes2(x int, y int) (*int, *int) {
|
|
var p [2]*int;
|
|
n := 0;
|
|
for i := x; n < 2; i = y {
|
|
p[n] = &i;
|
|
n++;
|
|
}
|
|
return p[0], p[1]
|
|
}
|
|
|
|
func main() {
|
|
p, q := i_escapes(1), i_escapes(2);
|
|
chk(p, q, 1, "i_escapes");
|
|
|
|
p, q = j_escapes(3), j_escapes(4);
|
|
chk(p, q, 3, "j_escapes");
|
|
|
|
p, q = k_escapes(5), k_escapes(6);
|
|
chk(p, q, 5, "k_escapes");
|
|
|
|
p, q = in_escapes(7), in_escapes(8);
|
|
chk(p, q, 7, "in_escapes");
|
|
|
|
p, q = select_escapes(9), select_escapes(10);
|
|
chk(p, q, 9, "select_escapes");
|
|
|
|
p, q = select_escapes1(11, 12);
|
|
chk(p, q, 11, "select_escapes1");
|
|
|
|
p, q = range_escapes(13), range_escapes(14);
|
|
chk(p, q, 13, "range_escapes");
|
|
|
|
p, q = range_escapes2(101, 102);
|
|
chkalias(p, q, 101, "range_escapes2");
|
|
|
|
p, q = for_escapes2(103, 104);
|
|
chkalias(p, q, 103, "for_escapes2");
|
|
|
|
if bad {
|
|
panic("BUG: no escape");
|
|
}
|
|
}
|