mirror of https://go.googlesource.com/go
118 lines
3.1 KiB
Go
118 lines
3.1 KiB
Go
// Copyright 2021 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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//go:build goexperiment.regabiargs
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// This file contains tests specific to making sure the register ABI
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// works in a bunch of contexts in the runtime.
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package runtime_test
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import (
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"internal/abi"
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"internal/runtime/atomic"
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"internal/testenv"
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"os"
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"os/exec"
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"runtime"
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"strings"
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"testing"
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"time"
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)
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var regConfirmRun atomic.Int32
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//go:registerparams
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func regFinalizerPointer(v *TintPointer) (int, float32, [10]byte) {
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regConfirmRun.Store(int32(*(*int)(v.p)))
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return 5151, 4.0, [10]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
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}
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//go:registerparams
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func regFinalizerIface(v Tinter) (int, float32, [10]byte) {
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regConfirmRun.Store(int32(*(*int)(v.(*TintPointer).p)))
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return 5151, 4.0, [10]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
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}
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// TintPointer has a pointer member to make sure that it isn't allocated by the
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// tiny allocator, so we know when its finalizer will run
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type TintPointer struct {
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p *Tint
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}
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func (*TintPointer) m() {}
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func TestFinalizerRegisterABI(t *testing.T) {
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testenv.MustHaveExec(t)
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// Actually run the test in a subprocess because we don't want
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// finalizers from other tests interfering.
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if os.Getenv("TEST_FINALIZER_REGABI") != "1" {
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cmd := testenv.CleanCmdEnv(exec.Command(os.Args[0], "-test.run=^TestFinalizerRegisterABI$", "-test.v"))
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cmd.Env = append(cmd.Env, "TEST_FINALIZER_REGABI=1")
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out, err := cmd.CombinedOutput()
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if !strings.Contains(string(out), "PASS\n") || err != nil {
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t.Fatalf("%s\n(exit status %v)", string(out), err)
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}
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return
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}
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// Optimistically clear any latent finalizers from e.g. the testing
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// package before continuing.
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//
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// It's possible that a finalizer only becomes available to run
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// after this point, which would interfere with the test and could
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// cause a crash, but because we're running in a separate process
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// it's extremely unlikely.
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runtime.GC()
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runtime.GC()
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// fing will only pick the new IntRegArgs up if it's currently
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// sleeping and wakes up, so wait for it to go to sleep.
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success := false
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for i := 0; i < 100; i++ {
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if runtime.FinalizerGAsleep() {
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success = true
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break
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}
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time.Sleep(20 * time.Millisecond)
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}
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if !success {
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t.Fatal("finalizer not asleep?")
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}
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argRegsBefore := runtime.SetIntArgRegs(abi.IntArgRegs)
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defer runtime.SetIntArgRegs(argRegsBefore)
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tests := []struct {
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name string
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fin any
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confirmValue int
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}{
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{"Pointer", regFinalizerPointer, -1},
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{"Interface", regFinalizerIface, -2},
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}
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for i := range tests {
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test := &tests[i]
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t.Run(test.name, func(t *testing.T) {
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x := &TintPointer{p: new(Tint)}
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*x.p = (Tint)(test.confirmValue)
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runtime.SetFinalizer(x, test.fin)
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runtime.KeepAlive(x)
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// Queue the finalizer.
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runtime.GC()
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runtime.GC()
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if !runtime.BlockUntilEmptyFinalizerQueue(int64(time.Second)) {
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t.Fatal("finalizer failed to execute")
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}
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if got := int(regConfirmRun.Load()); got != test.confirmValue {
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t.Fatalf("wrong finalizer executed? got %d, want %d", got, test.confirmValue)
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}
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})
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}
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}
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