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// 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.
//go:build goexperiment.regabiargs
// This file contains tests specific to making sure the register ABI
// works in a bunch of contexts in the runtime.
package runtime_test
import (
"internal/abi"
"internal/testenv"
"os"
"os/exec"
"runtime"
"strings"
"testing"
"time"
)
var regConfirmRun chan int
//go:registerparams
func regFinalizerPointer(v *Tint) (int, float32, [10]byte) {
regConfirmRun <- *(*int)(v)
return 5151, 4.0, [10]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
}
//go:registerparams
func regFinalizerIface(v Tinter) (int, float32, [10]byte) {
regConfirmRun <- *(*int)(v.(*Tint))
return 5151, 4.0, [10]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
}
func TestFinalizerRegisterABI(t *testing.T) {
testenv.MustHaveExec(t)
// Actually run the test in a subprocess because we don't want
// finalizers from other tests interfering.
if os.Getenv("TEST_FINALIZER_REGABI") != "1" {
cmd := testenv.CleanCmdEnv(exec.Command(os.Args[0], "-test.run=^TestFinalizerRegisterABI$", "-test.v"))
cmd.Env = append(cmd.Env, "TEST_FINALIZER_REGABI=1")
out, err := cmd.CombinedOutput()
if !strings.Contains(string(out), "PASS\n") || err != nil {
t.Fatalf("%s\n(exit status %v)", string(out), err)
}
return
}
// Optimistically clear any latent finalizers from e.g. the testing
// package before continuing.
//
// It's possible that a finalizer only becomes available to run
// after this point, which would interfere with the test and could
// cause a crash, but because we're running in a separate process
// it's extremely unlikely.
runtime.GC()
runtime.GC()
// fing will only pick the new IntRegArgs up if it's currently
// sleeping and wakes up, so wait for it to go to sleep.
success := false
for i := 0; i < 100; i++ {
if runtime.FinalizerGAsleep() {
success = true
break
}
time.Sleep(20 * time.Millisecond)
}
if !success {
t.Fatal("finalizer not asleep?")
}
argRegsBefore := runtime.SetIntArgRegs(abi.IntArgRegs)
defer runtime.SetIntArgRegs(argRegsBefore)
tests := []struct {
name string
fin any
confirmValue int
}{
{"Pointer", regFinalizerPointer, -1},
{"Interface", regFinalizerIface, -2},
}
for i := range tests {
test := &tests[i]
t.Run(test.name, func(t *testing.T) {
regConfirmRun = make(chan int)
x := new(Tint)
*x = (Tint)(test.confirmValue)
runtime.SetFinalizer(x, test.fin)
runtime.KeepAlive(x)
// Queue the finalizer.
runtime.GC()
runtime.GC()
select {
case <-time.After(time.Second):
t.Fatal("finalizer failed to execute")
case gotVal := <-regConfirmRun:
if gotVal != test.confirmValue {
t.Fatalf("wrong finalizer executed? got %d, want %d", gotVal, test.confirmValue)
}
}
})
}
}