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ec2ea40b31
So it won't be visible outside of runtime package. There are changes to
make tests happy:
- For test/directive*.go files, using "go:noinline" for testing misplaced
directives instead.
- Restrict test/fixedbugs/bug515.go for gccgo only.
- For test/notinheap{2,3}.go, using runtime/cgo.Incomplete for marking
the type as not-in-heap. Though it's somewhat clumsy, it's the easiest
way to keep the test errors for not-in-heap types until we can cleanup
further.
- test/typeparam/mdempsky/11.go is about defined type in user code marked
as go:notinheap, which can't happen after this CL, though.
Fixes #46731
Change-Id: I869f5b2230c8a2a363feeec042e7723bbc416e8e
Reviewed-on: https://go-review.googlesource.com/c/go/+/421882
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Joedian Reid <joedian@golang.org>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
81 lines
1.3 KiB
Go
81 lines
1.3 KiB
Go
// errorcheck -+ -0 -l -d=wb
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test write barrier elimination for notinheap.
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//go:build cgo
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package p
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import "runtime/cgo"
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type t1 struct {
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x *nih
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s []nih
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y [1024]byte // Prevent write decomposition
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}
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type t2 struct {
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x *ih
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s []ih
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y [1024]byte
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}
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type nih struct {
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_ cgo.Incomplete
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x uintptr
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}
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type ih struct { // In-heap type
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x uintptr
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}
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var (
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v1 t1
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v2 t2
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v1s []t1
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v2s []t2
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)
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func f() {
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// Test direct writes
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v1.x = nil // no barrier
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v2.x = nil // ERROR "write barrier"
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v1.s = []nih(nil) // no barrier
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v2.s = []ih(nil) // ERROR "write barrier"
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}
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func g() {
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// Test aggregate writes
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v1 = t1{x: nil} // no barrier
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v2 = t2{x: nil} // ERROR "write barrier"
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}
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func h() {
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// Test copies and appends.
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copy(v1s, v1s[1:]) // no barrier
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copy(v2s, v2s[1:]) // ERROR "write barrier"
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_ = append(v1s, v1s...) // no barrier
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_ = append(v2s, v2s...) // ERROR "write barrier"
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}
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// Slice clearing
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var (
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sliceIH []*ih
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sliceNIH []*nih
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)
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func sliceClear() {
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for i := range sliceIH {
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sliceIH[i] = nil // ERROR "write barrier"
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}
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for i := range sliceNIH {
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sliceNIH[i] = nil // no barrier
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}
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}
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