mirror of
https://github.com/golang/go
synced 2024-11-26 20:41:24 -07:00
9a8372f8bd
The previous CL introduced stack objects. This CL removes the old ambiguously live liveness analysis. After this CL we're relying on stack objects exclusively. Update a bunch of liveness tests to reflect the new world. Fixes #22350 Change-Id: I739b26e015882231011ce6bc1a7f426049e59f31 Reviewed-on: https://go-review.googlesource.com/c/134156 Reviewed-by: Austin Clements <austin@google.com> Reviewed-by: Cherry Zhang <cherryyz@google.com>
94 lines
1.4 KiB
Go
94 lines
1.4 KiB
Go
// 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.
|
|
|
|
// This test makes sure that ambiguously live arguments work correctly.
|
|
|
|
package main
|
|
|
|
import (
|
|
"runtime"
|
|
)
|
|
|
|
type HeapObj [8]int64
|
|
|
|
type StkObj struct {
|
|
h *HeapObj
|
|
}
|
|
|
|
var n int
|
|
var c int = -1
|
|
|
|
func gc() {
|
|
// encourage heap object to be collected, and have its finalizer run.
|
|
runtime.GC()
|
|
runtime.GC()
|
|
runtime.GC()
|
|
n++
|
|
}
|
|
|
|
var null StkObj
|
|
|
|
var sink *HeapObj
|
|
|
|
//go:noinline
|
|
func use(p *StkObj) {
|
|
}
|
|
|
|
//go:noinline
|
|
func f(s StkObj, b bool) {
|
|
var p *StkObj
|
|
if b {
|
|
p = &s
|
|
} else {
|
|
p = &null
|
|
}
|
|
// use is required here to prevent the conditional
|
|
// code above from being executed after the first gc() call.
|
|
use(p)
|
|
// If b==false, h should be collected here.
|
|
gc() // 0
|
|
sink = p.h
|
|
gc() // 1
|
|
sink = nil
|
|
// If b==true, h should be collected here.
|
|
gc() // 2
|
|
}
|
|
|
|
func fTrue() {
|
|
var s StkObj
|
|
s.h = new(HeapObj)
|
|
c = -1
|
|
n = 0
|
|
runtime.SetFinalizer(s.h, func(h *HeapObj) {
|
|
// Remember at what phase the heap object was collected.
|
|
c = n
|
|
})
|
|
f(s, true)
|
|
if c != 2 {
|
|
panic("bad liveness")
|
|
}
|
|
}
|
|
|
|
func fFalse() {
|
|
var s StkObj
|
|
s.h = new(HeapObj)
|
|
c = -1
|
|
n = 0
|
|
runtime.SetFinalizer(s.h, func(h *HeapObj) {
|
|
// Remember at what phase the heap object was collected.
|
|
c = n
|
|
})
|
|
f(s, false)
|
|
if c != 0 {
|
|
panic("bad liveness")
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
fTrue()
|
|
fFalse()
|
|
}
|