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part_live_2.go
// run // Copyright 2021 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. // A test for partial liveness / partial spilling / compiler-induced GC failure package main import "runtime" import "unsafe" //go:registerparams func F(s []int) { for i, x := range s { G(i, x) } GC() H(&s[0]) // It's possible that this will make the spill redundant, but there's a bug in spill slot allocation. G(len(s), cap(s)) GC() } //go:noinline //go:registerparams func G(int, int) {} //go:noinline //go:registerparams func H(*int) {} //go:registerparams func GC() { runtime.GC(); runtime.GC() } func main() { s := make([]int, 3) escape(s) p := int(uintptr(unsafe.Pointer(&s[2])) + 42) // likely point to unallocated memory poison([3]int{p, p, p}) F(s) } //go:noinline //go:registerparams func poison([3]int) {} //go:noinline //go:registerparams func escape(s []int) { g = s } var g []int
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