syscall_fixed_test.go RawHistoryFolder

1// SPDX-License-Identifier: Apache-2.0
2// SPDX-FileCopyrightText: 2026 The Ebitengine Authors
3
4//go:build !windows && !plan9
5
6package purego_test
7
8import (
9	"path/filepath"
10	"runtime"
11	"runtime/debug"
12	"sync"
13	"testing"
14	"unsafe"
15
16	"github.com/bnema/purego"
17	"github.com/bnema/purego/internal/load"
18)
19
20//go:noinline
21func writeDeep(sym uintptr, depth int) bool {
22	var pad [1024]byte
23	pad[0] = byte(depth)
24	if depth > 0 {
25		ok := writeDeep(sym, depth-1)
26		runtime.KeepAlive(pad)
27		return ok
28	}
29	var local uint64
30	purego.Syscall6(sym, uintptr(unsafe.Pointer(&local)), 42, 0, 0, 0, 0)
31	runtime.KeepAlive(&local)
32	runtime.KeepAlive(pad)
33	return local == 42
34}
35
36func TestSyscall6PointerLiveness(t *testing.T) {
37	libFile := filepath.Join(t.TempDir(), "libbenchmark.so")
38	if err := buildSharedLib(t, "CC", libFile, filepath.Join("testdata", "benchmarktest", "benchmark.c")); err != nil {
39		t.Fatal(err)
40	}
41	lib, err := load.OpenLibrary(libFile)
42	if err != nil {
43		t.Fatal(err)
44	}
45	defer load.CloseLibrary(lib)
46	sym, err := load.OpenSymbol(lib, "write_through")
47	if err != nil {
48		t.Fatal(err)
49	}
50
51	stop := make(chan struct{})
52	var wg sync.WaitGroup
53	wg.Add(1)
54	go func() {
55		defer wg.Done()
56		for {
57			select {
58			case <-stop:
59				return
60			default:
61				runtime.GC()
62				debug.FreeOSMemory()
63			}
64		}
65	}()
66	defer func() { close(stop); wg.Wait() }()
67
68	for i := 0; i < 32; i++ {
69		if !writeDeep(sym, 0) {
70			t.Fatal("stack local not updated")
71		}
72	}
73	if !writeDeep(sym, 64) {
74		t.Fatal("deep stack local not updated")
75	}
76	heap := new(uint64)
77	purego.Syscall6(sym, uintptr(unsafe.Pointer(heap)), 42, 0, 0, 0, 0)
78	runtime.KeepAlive(heap)
79	if *heap != 42 {
80		t.Fatalf("heap value = %d", *heap)
81	}
82}