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//go:build !windows
package gen
import (
"bytes"
"os"
"path/filepath"
"testing"
"github.com/cilium/ebpf/internal/testutils"
)
const minimalSocketFilter = `__attribute__((section("socket"), used)) int main() { return 0; }`
func TestCompile(t *testing.T) {
if testing.Short() {
t.SkipNow()
}
dir := t.TempDir()
mustWriteFile(t, dir, "test.c", minimalSocketFilter)
err := Compile(CompileArgs{
CC: testutils.ClangBin(t),
DisableStripping: true,
Workdir: dir,
Source: filepath.Join(dir, "test.c"),
Dest: filepath.Join(dir, "test.o"),
})
if err != nil {
t.Fatal("Can't compile:", err)
}
stat, err := os.Stat(filepath.Join(dir, "test.o"))
if err != nil {
t.Fatal("Can't stat output:", err)
}
if stat.Size() == 0 {
t.Error("Compilation creates an empty file")
}
}
func TestReproducibleCompile(t *testing.T) {
if testing.Short() {
t.SkipNow()
}
clangBin := testutils.ClangBin(t)
dir := t.TempDir()
mustWriteFile(t, dir, "test.c", minimalSocketFilter)
err := Compile(CompileArgs{
CC: clangBin,
DisableStripping: true,
Workdir: dir,
Source: filepath.Join(dir, "test.c"),
Dest: filepath.Join(dir, "a.o"),
})
if err != nil {
t.Fatal("Can't compile:", err)
}
err = Compile(CompileArgs{
CC: clangBin,
DisableStripping: true,
Workdir: dir,
Source: filepath.Join(dir, "test.c"),
Dest: filepath.Join(dir, "b.o"),
})
if err != nil {
t.Fatal("Can't compile:", err)
}
aBytes, err := os.ReadFile(filepath.Join(dir, "a.o"))
if err != nil {
t.Fatal(err)
}
bBytes, err := os.ReadFile(filepath.Join(dir, "b.o"))
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(aBytes, bBytes) {
t.Error("Compiling the same file twice doesn't give the same result")
}
}
func TestTriggerMissingTarget(t *testing.T) {
if testing.Short() {
t.SkipNow()
}
dir := t.TempDir()
mustWriteFile(t, dir, "test.c", `_Pragma(__BPF_TARGET_MISSING);`)
err := Compile(CompileArgs{
CC: testutils.ClangBin(t),
Workdir: dir,
Source: filepath.Join(dir, "test.c"),
Dest: filepath.Join(dir, "a.o"),
})
if err == nil {
t.Fatal("No error when compiling __BPF_TARGET_MISSING")
}
}
func mustWriteFile(tb testing.TB, dir, name, contents string) {
tb.Helper()
tmpFile := filepath.Join(dir, name)
if err := os.WriteFile(tmpFile, []byte(contents), 0660); err != nil {
tb.Fatal(err)
}
}
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