go notinheap2 源码
golang notinheap2 代码
文件路径：/test/notinheap2.go
// errorcheck -+
// Copyright 2016 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.
// Test walk errors for go:notinheap.
package p
//go:notinheap
type nih struct {
next *nih
}
// Global variables are okay.
var x nih
// Stack variables are not okay.
func f() {
var y nih // ERROR "nih is incomplete \(or unallocatable\); stack allocation disallowed"
x = y
}
// Heap allocation is not okay.
var y *nih
var y2 *struct{ x nih }
var y3 *[1]nih
var z []nih
var w []nih
var n int
var sink interface{}
type embed1 struct { // implicitly notinheap
x nih
}
type embed2 [1]nih // implicitly notinheap
type embed3 struct { // implicitly notinheap
x [1]nih
}
// Type aliases inherit the go:notinheap-ness of the type they alias.
type nihAlias = nih
type embedAlias1 struct { // implicitly notinheap
x nihAlias
}
type embedAlias2 [1]nihAlias // implicitly notinheap
func g() {
y = new(nih) // ERROR "can't be allocated in Go"
y2 = new(struct{ x nih }) // ERROR "can't be allocated in Go"
y3 = new([1]nih) // ERROR "can't be allocated in Go"
z = make([]nih, 1) // ERROR "can't be allocated in Go"
z = append(z, x) // ERROR "can't be allocated in Go"
sink = new(embed1) // ERROR "can't be allocated in Go"
sink = new(embed2) // ERROR "can't be allocated in Go"
sink = new(embed3) // ERROR "can't be allocated in Go"
sink = new(embedAlias1) // ERROR "can't be allocated in Go"
sink = new(embedAlias2) // ERROR "can't be allocated in Go"
// Test for special case of OMAKESLICECOPY
x := make([]nih, n) // ERROR "can't be allocated in Go"
copy(x, z)
z = x
}
// Writes don't produce write barriers.
var p *nih
//go:nowritebarrier
func h() {
y.next = p.next
}
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