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// run // 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 // Test 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) bad = true } if *q != v+1 { println("wrong value want", v+1, "got", *q, "after", s) bad = true } } 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 _, 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 var k, v int 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 i := x for ; n < 2; i = y { p[n] = &i n++ } return p[0], p[1] } func for_escapes3(x int, y int) (*int, *int) { var f [2]func() *int n := 0 for i := x; n < 2; i = y { p := new(int) *p = i f[n] = func() *int { return p } n++ } return f[0](), f[1]() } func out_escapes(i int) (x int, p *int) { x = i p = &x // ERROR "address of out parameter" return } func out_escapes_2(i int) (x int, p *int) { x = i return x, &x // ERROR "address of out parameter" } func defer1(i int) (x int) { c := make(chan int) go func() { x = i; c <- 1 }() <-c return } 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") p, q = for_escapes3(105, 106) chk(p, q, 105, "for_escapes3") _, p = out_escapes(15) _, q = out_escapes(16) chk(p, q, 15, "out_escapes") _, p = out_escapes_2(17) _, q = out_escapes_2(18) chk(p, q, 17, "out_escapes_2") x := defer1(20) if x != 20 { println("defer failed", x) bad = true } if bad { panic("BUG: no escape") } }