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Copy pathtypes_test.go
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479 lines (410 loc) · 10.4 KB
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package btf
import (
"bytes"
"fmt"
"reflect"
"testing"
"github.com/cilium/ebpf/internal"
qt "github.com/frankban/quicktest"
"github.com/google/go-cmp/cmp"
)
func TestSizeof(t *testing.T) {
testcases := []struct {
size int
typ Type
}{
{0, (*Void)(nil)},
{1, &Int{Size: 1}},
{8, &Enum{Size: 8}},
{0, &Array{Type: &Pointer{Target: (*Void)(nil)}, Nelems: 0}},
{12, &Array{Type: &Enum{Size: 4}, Nelems: 3}},
}
for _, tc := range testcases {
name := fmt.Sprint(tc.typ)
t.Run(name, func(t *testing.T) {
have, err := Sizeof(tc.typ)
if err != nil {
t.Fatal("Can't calculate size:", err)
}
if have != tc.size {
t.Errorf("Expected size %d, got %d", tc.size, have)
}
})
}
}
func TestPow(t *testing.T) {
tests := []struct {
n int
r bool
}{
{0, false},
{1, true},
{2, true},
{3, false},
{4, true},
{5, false},
{8, true},
}
for _, tt := range tests {
t.Run(fmt.Sprintf("%d", tt.n), func(t *testing.T) {
if want, got := tt.r, pow(tt.n); want != got {
t.Errorf("unexpected result for n %d; want: %v, got: %v", tt.n, want, got)
}
})
}
}
func TestCopy(t *testing.T) {
_ = Copy((*Void)(nil), nil)
in := &Int{Size: 4}
out := Copy(in, nil)
in.Size = 8
if size := out.(*Int).Size; size != 4 {
t.Error("Copy doesn't make a copy, expected size 4, got", size)
}
t.Run("cyclical", func(t *testing.T) {
_ = Copy(newCyclicalType(2), nil)
})
t.Run("identity", func(t *testing.T) {
u16 := &Int{Size: 2}
out := Copy(&Struct{
Members: []Member{
{Name: "a", Type: u16},
{Name: "b", Type: u16},
},
}, nil)
outStruct := out.(*Struct)
qt.Assert(t, outStruct.Members[0].Type, qt.Equals, outStruct.Members[1].Type)
})
}
func BenchmarkCopy(b *testing.B) {
typ := newCyclicalType(10)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
Copy(typ, nil)
}
}
// The following are valid Types.
//
// There currently is no better way to document which
// types implement an interface.
func ExampleType_validTypes() {
var _ Type = &Void{}
var _ Type = &Int{}
var _ Type = &Pointer{}
var _ Type = &Array{}
var _ Type = &Struct{}
var _ Type = &Union{}
var _ Type = &Enum{}
var _ Type = &Fwd{}
var _ Type = &Typedef{}
var _ Type = &Volatile{}
var _ Type = &Const{}
var _ Type = &Restrict{}
var _ Type = &Func{}
var _ Type = &FuncProto{}
var _ Type = &Var{}
var _ Type = &Datasec{}
var _ Type = &Float{}
}
func TestType(t *testing.T) {
types := []func() Type{
func() Type { return &Void{} },
func() Type { return &Int{Size: 2} },
func() Type { return &Pointer{Target: &Void{}} },
func() Type { return &Array{Type: &Int{}} },
func() Type {
return &Struct{
Members: []Member{{Type: &Void{}}},
}
},
func() Type {
return &Union{
Members: []Member{{Type: &Void{}}},
}
},
func() Type { return &Enum{} },
func() Type { return &Fwd{Name: "thunk"} },
func() Type { return &Typedef{Type: &Void{}} },
func() Type { return &Volatile{Type: &Void{}} },
func() Type { return &Const{Type: &Void{}} },
func() Type { return &Restrict{Type: &Void{}} },
func() Type { return &Func{Name: "foo", Type: &Void{}} },
func() Type {
return &FuncProto{
Params: []FuncParam{{Name: "bar", Type: &Void{}}},
Return: &Void{},
}
},
func() Type { return &Var{Type: &Void{}} },
func() Type {
return &Datasec{
Vars: []VarSecinfo{{Type: &Void{}}},
}
},
func() Type { return &Float{} },
func() Type { return &declTag{Type: &Void{}} },
func() Type { return &typeTag{Type: &Void{}} },
func() Type { return &cycle{&Void{}} },
}
compareTypes := cmp.Comparer(func(a, b *Type) bool {
return a == b
})
for _, fn := range types {
typ := fn()
t.Run(fmt.Sprintf("%T", typ), func(t *testing.T) {
t.Logf("%v", typ)
if typ == typ.copy() {
t.Error("Copy doesn't copy")
}
var a []*Type
walkType(typ, func(t *Type) { a = append(a, t) })
if _, ok := typ.(*cycle); !ok {
if n := countChildren(t, reflect.TypeOf(typ)); len(a) < n {
t.Errorf("walkType visited %d children, expected at least %d", len(a), n)
}
}
var b []*Type
walkType(typ, func(t *Type) { b = append(b, t) })
if diff := cmp.Diff(a, b, compareTypes); diff != "" {
t.Errorf("Walk mismatch (-want +got):\n%s", diff)
}
})
}
}
func TestTagMarshaling(t *testing.T) {
for _, typ := range []Type{
&declTag{&Struct{Members: []Member{}}, "foo", -1},
&typeTag{&Int{}, "foo"},
} {
t.Run(fmt.Sprint(typ), func(t *testing.T) {
var buf bytes.Buffer
err := marshalTypes(&buf, []Type{&Void{}, typ}, nil, nil)
qt.Assert(t, err, qt.IsNil)
s, err := loadRawSpec(bytes.NewReader(buf.Bytes()), internal.NativeEndian, nil)
qt.Assert(t, err, qt.IsNil)
have, err := s.TypeByID(1)
qt.Assert(t, err, qt.IsNil)
qt.Assert(t, have, qt.DeepEquals, typ)
})
}
}
func countChildren(t *testing.T, typ reflect.Type) int {
if typ.Kind() != reflect.Pointer {
t.Fatal("Expected pointer, got", typ.Kind())
}
typ = typ.Elem()
if typ.Kind() != reflect.Struct {
t.Fatal("Expected struct, got", typ.Kind())
}
var n int
for i := 0; i < typ.NumField(); i++ {
if typ.Field(i).Type == reflect.TypeOf((*Type)(nil)).Elem() {
n++
}
}
return n
}
type testFormattableType struct {
name string
extra []interface{}
}
var _ formattableType = (*testFormattableType)(nil)
func (tft *testFormattableType) TypeName() string { return tft.name }
func (tft *testFormattableType) Format(fs fmt.State, verb rune) {
formatType(fs, verb, tft, tft.extra...)
}
func TestFormatType(t *testing.T) {
t1 := &testFormattableType{"", []interface{}{"extra"}}
t1Addr := fmt.Sprintf("%#p", t1)
goType := reflect.TypeOf(t1).Elem().Name()
t2 := &testFormattableType{"foo", []interface{}{t1}}
t3 := &testFormattableType{extra: []interface{}{""}}
tests := []struct {
t formattableType
fmt string
contains []string
omits []string
}{
// %s doesn't contain address or extra.
{t1, "%s", []string{goType}, []string{t1Addr, "extra"}},
// %+s doesn't contain extra.
{t1, "%+s", []string{goType, t1Addr}, []string{"extra"}},
// %v does contain extra.
{t1, "%v", []string{goType, "extra"}, []string{t1Addr}},
// %+v does contain address.
{t1, "%+v", []string{goType, "extra", t1Addr}, nil},
// %v doesn't print nested types' extra.
{t2, "%v", []string{goType, t2.name}, []string{"extra"}},
// %1v does print nested types' extra.
{t2, "%1v", []string{goType, t2.name, "extra"}, nil},
// empty strings in extra don't emit anything.
{t3, "%v", []string{"[]"}, nil},
}
for _, test := range tests {
t.Run(test.fmt, func(t *testing.T) {
str := fmt.Sprintf(test.fmt, test.t)
t.Log(str)
for _, want := range test.contains {
qt.Assert(t, str, qt.Contains, want)
}
for _, notWant := range test.omits {
qt.Assert(t, str, qt.Not(qt.Contains), notWant)
}
})
}
}
func newCyclicalType(n int) Type {
ptr := &Pointer{}
prev := Type(ptr)
for i := 0; i < n; i++ {
switch i % 5 {
case 0:
prev = &Struct{
Members: []Member{
{Type: prev},
},
}
case 1:
prev = &Const{Type: prev}
case 2:
prev = &Volatile{Type: prev}
case 3:
prev = &Typedef{Type: prev}
case 4:
prev = &Array{Type: prev, Index: &Int{Size: 1}}
}
}
ptr.Target = prev
return ptr
}
func TestUnderlyingType(t *testing.T) {
wrappers := []struct {
name string
fn func(Type) Type
}{
{"const", func(t Type) Type { return &Const{Type: t} }},
{"volatile", func(t Type) Type { return &Volatile{Type: t} }},
{"restrict", func(t Type) Type { return &Restrict{Type: t} }},
{"typedef", func(t Type) Type { return &Typedef{Type: t} }},
{"type tag", func(t Type) Type { return &typeTag{Type: t} }},
}
for _, test := range wrappers {
t.Run(test.name+" cycle", func(t *testing.T) {
root := &Volatile{}
root.Type = test.fn(root)
got, ok := UnderlyingType(root).(*cycle)
qt.Assert(t, ok, qt.IsTrue)
qt.Assert(t, got.root, qt.Equals, root)
})
}
for _, test := range wrappers {
t.Run(test.name, func(t *testing.T) {
want := &Int{}
got := UnderlyingType(test.fn(want))
qt.Assert(t, got, qt.Equals, want)
})
}
}
func TestInflateLegacyBitfield(t *testing.T) {
const offset = 3
const size = 5
var rawInt rawType
rawInt.SetKind(kindInt)
rawInt.SetSize(4)
var data btfInt
data.SetOffset(offset)
data.SetBits(size)
rawInt.data = &data
var beforeInt rawType
beforeInt.SetKind(kindStruct)
beforeInt.SetVlen(1)
beforeInt.data = []btfMember{{Type: 2}}
afterInt := beforeInt
afterInt.data = []btfMember{{Type: 1}}
emptyStrings := newStringTable("")
for _, test := range []struct {
name string
raw []rawType
}{
{"struct before int", []rawType{beforeInt, rawInt}},
{"struct after int", []rawType{rawInt, afterInt}},
} {
t.Run(test.name, func(t *testing.T) {
types, err := inflateRawTypes(test.raw, emptyStrings, nil)
if err != nil {
t.Fatal(err)
}
for _, typ := range types {
s, ok := typ.(*Struct)
if !ok {
continue
}
i := s.Members[0]
if i.BitfieldSize != size {
t.Errorf("Expected bitfield size %d, got %d", size, i.BitfieldSize)
}
if i.Offset != offset {
t.Errorf("Expected offset %d, got %d", offset, i.Offset)
}
return
}
t.Fatal("No Struct returned from inflateRawTypes")
})
}
}
func BenchmarkWalk(b *testing.B) {
types := []Type{
&Void{},
&Int{},
&Pointer{},
&Array{},
&Struct{Members: make([]Member, 2)},
&Union{Members: make([]Member, 2)},
&Enum{},
&Fwd{},
&Typedef{},
&Volatile{},
&Const{},
&Restrict{},
&Func{},
&FuncProto{Params: make([]FuncParam, 2)},
&Var{},
&Datasec{Vars: make([]VarSecinfo, 2)},
}
for _, typ := range types {
b.Run(fmt.Sprint(typ), func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
var dq typeDeque
walkType(typ, dq.Push)
}
})
}
}
func BenchmarkUnderlyingType(b *testing.B) {
b.Run("no unwrapping", func(b *testing.B) {
v := &Int{}
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
UnderlyingType(v)
}
})
b.Run("single unwrapping", func(b *testing.B) {
v := &Typedef{Type: &Int{}}
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
UnderlyingType(v)
}
})
}
// Copy can be used with UnderlyingType to strip qualifiers from a type graph.
func ExampleCopy_stripQualifiers() {
a := &Volatile{Type: &Pointer{Target: &Typedef{Name: "foo", Type: &Int{Size: 2}}}}
b := Copy(a, UnderlyingType)
// b has Volatile and Typedef removed.
fmt.Printf("%3v\n", b)
// Output: Pointer[target=Int[unsigned size=16]]
}