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master
test/fixedbugs/issue27278.go
63 строки
865 B
Cherry Zhang
cmd/compile: count nil check as use in dead auto elim
30 авг 2018, 05:19
30 авг 2018, 05:19
54f9c04
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// run // Copyright 2018 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. // Issue 27278: dead auto elim deletes an auto and its // initialization, but it is live because of a nil check. package main type T struct { _ [3]string T2 } func (t *T) M() []string { return t.T2.M() } type T2 struct { T3 } func (t *T2) M() []string { return t.T3.M() } type T3 struct { a string } func (t *T3) M() []string { return []string{} } func main() { poison() f() } //go:noinline func f() { (&T{}).M() grow(10000) } // grow stack, triggers stack copy func grow(n int) { if n == 0 { return } grow(n-1) } // put some junk on stack, which cannot be valid address //go:noinline func poison() { x := [10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10} g = x } var g [10]int