go part_live_2 源码
golang part_live_2 代码
文件路径：/test/abi/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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