Source file test/escape4.go
Documentation: test
1 // errorcheck -0 -m 2 3 // Copyright 2010 The Go Authors. All rights reserved. 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file. 6 7 // Test, using compiler diagnostic flags, that the escape analysis is working. 8 // Compiles but does not run. Inlining is enabled. 9 10 package foo 11 12 var p *int 13 14 func alloc(x int) *int { // ERROR "can inline alloc" "moved to heap: x" 15 return &x 16 } 17 18 var f func() 19 20 func f1() { 21 p = alloc(2) // ERROR "inlining call to alloc" "moved to heap: x" 22 23 // Escape analysis used to miss inlined code in closures. 24 25 func() { // ERROR "can inline f1.func1" 26 p = alloc(3) // ERROR "inlining call to alloc" 27 }() // ERROR "inlining call to f1.func1" "inlining call to alloc" "moved to heap: x" 28 29 f = func() { // ERROR "func literal escapes to heap" "can inline f1.func2" 30 p = alloc(3) // ERROR "inlining call to alloc" "moved to heap: x" 31 } 32 f() 33 } 34 35 func f2() {} // ERROR "can inline f2" 36 37 // No inline for recover; panic now allowed to inline. 38 func f3() { panic(1) } // ERROR "can inline f3" "1 escapes to heap" 39 func f4() { recover() } 40 41 func f5() *byte { 42 type T struct { 43 x [1]byte 44 } 45 t := new(T) // ERROR "new.T. escapes to heap" 46 return &t.x[0] 47 } 48 49 func f6() *byte { 50 type T struct { 51 x struct { 52 y byte 53 } 54 } 55 t := new(T) // ERROR "new.T. escapes to heap" 56 return &t.x.y 57 } 58