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c8057d8569
if q != nil {
p = &q.f
}
Which gets rewritten to a conditional move:
tmp := &q.f
p = Select q!=nil, tmp, p
Unfortunately, we can't compute &q.f before we've checked if q is nil,
because if it is nil, &q.f is an invalid pointer (if f's offset is
nonzero but small).
Normally this is not a problem because the tmp variable above
immediately dies, and is thus not live across any safepoint. However,
if later there is another &q.f computation, those two computations are
CSEd, causing tmp to be used at both use points. That will extend
tmp's lifetime, possibly across a call.
Fixes #56990
Change-Id: I3ea31be93feae04fbe3304cb11323194c5df3879
Reviewed-on: https://go-review.googlesource.com/c/go/+/454155
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
120 lines
2.3 KiB
Go
120 lines
2.3 KiB
Go
// run
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// Copyright 2022 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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package main
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import (
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"fmt"
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"path/filepath"
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"testing"
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)
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var t *testing.T
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type TypeMeta struct {
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Kind string
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APIVersion string
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}
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type ObjectMeta struct {
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Name string `json:"name,omitempty" protobuf:"bytes,1,opt,name=name"`
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GenerateName string `json:"generateName,omitempty" protobuf:"bytes,2,opt,name=generateName"`
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Namespace string `json:"namespace,omitempty" protobuf:"bytes,3,opt,name=namespace"`
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SelfLink string `json:"selfLink,omitempty" protobuf:"bytes,4,opt,name=selfLink"`
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}
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type ConfigSpec struct {
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Disks []DiskSpec
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StorageClass string
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}
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type DiskSpec struct {
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Name string
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Size string
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StorageClass string
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Annotations map[string]string
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VolumeName string
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}
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// Config is the Schema for the configs API.
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type Config struct {
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TypeMeta
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ObjectMeta
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Spec ConfigSpec
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}
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func findDiskSize(diskSpec *DiskSpec, configSpec *ConfigSpec) string {
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t.Log(fmt.Sprintf("Hello World"))
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return diskSpec.Size
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}
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func findStorageClassName(diskSpec *DiskSpec, configSpec *ConfigSpec) *string {
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if diskSpec.StorageClass != "" {
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return &diskSpec.StorageClass
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}
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if configSpec != nil {
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for _, d := range configSpec.Disks {
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if d.Name == diskSpec.Name {
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if d.StorageClass != "" {
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return &d.StorageClass
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}
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break
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}
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}
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if configSpec.StorageClass != "" {
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return &configSpec.StorageClass
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}
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}
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return nil
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}
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func Bar(config *Config) *ConfigSpec {
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var configSpec *ConfigSpec
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if config != nil {
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configSpec = &config.Spec
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}
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return configSpec
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}
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func Foo(diskSpec DiskSpec, config *Config) {
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cs := Bar(config)
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_ = findDiskSize(&diskSpec, cs)
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cs = Bar(config)
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_ = findStorageClassName(&diskSpec, cs)
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}
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func TestPanic(tt *testing.T) {
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t = tt
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myarray := []string{filepath.Join("..", "config", "crd", "bases")}
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for i := 0; i < 1000; i++ {
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Foo(DiskSpec{
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Name: "DataDisk",
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Size: "1Gi",
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}, nil)
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}
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t.Log(myarray)
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}
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// Hack to run tests in a playground
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func matchString(a, b string) (bool, error) {
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return a == b, nil
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}
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func main() {
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testSuite := []testing.InternalTest{
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{
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Name: "TestPanic",
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F: TestPanic,
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},
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}
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testing.Main(matchString, testSuite, nil, nil)
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}
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