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Copy pathformat_test.go
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267 lines (248 loc) · 6.08 KB
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package btf
import (
"errors"
"fmt"
"go/format"
"strings"
"testing"
)
func TestGoTypeDeclaration(t *testing.T) {
tests := []struct {
typ Type
output string
}{
{&Int{Size: 1}, "type t uint8"},
{&Int{Size: 1, Encoding: Bool}, "type t bool"},
{&Int{Size: 1, Encoding: Char}, "type t uint8"},
{&Int{Size: 2, Encoding: Signed}, "type t int16"},
{&Int{Size: 4, Encoding: Signed}, "type t int32"},
{&Int{Size: 8}, "type t uint64"},
{&Typedef{Name: "frob", Type: &Int{Size: 8}}, "type t uint64"},
{&Int{Size: 16}, "type t [16]byte /* uint128 */"},
{&Enum{Values: []EnumValue{{"FOO", 32}}, Size: 4}, "type t uint32; const ( tFOO t = 32; )"},
{&Enum{Values: []EnumValue{{"BAR", 1}}, Size: 1, Signed: true}, "type t int8; const ( tBAR t = 1; )"},
{
&Struct{
Name: "enum literals",
Size: 2,
Members: []Member{
{Name: "enum", Type: &Enum{Values: []EnumValue{{"BAR", 1}}, Size: 2}, Offset: 0},
},
},
"type t struct { enum uint16; }",
},
{&Array{Nelems: 2, Type: &Int{Size: 1}}, "type t [2]uint8"},
{
&Union{
Size: 8,
Members: []Member{
{Name: "a", Type: &Int{Size: 4}},
{Name: "b", Type: &Int{Size: 8}},
},
},
"type t struct { a uint32; _ [4]byte; }",
},
{
&Struct{
Name: "field padding",
Size: 16,
Members: []Member{
{Name: "frob", Type: &Int{Size: 4}, Offset: 0},
{Name: "foo", Type: &Int{Size: 8}, Offset: 8 * 8},
},
},
"type t struct { frob uint32; _ [4]byte; foo uint64; }",
},
{
&Struct{
Name: "end padding",
Size: 16,
Members: []Member{
{Name: "foo", Type: &Int{Size: 8}, Offset: 0},
{Name: "frob", Type: &Int{Size: 4}, Offset: 8 * 8},
},
},
"type t struct { foo uint64; frob uint32; _ [4]byte; }",
},
{
&Struct{
Name: "bitfield",
Size: 8,
Members: []Member{
{Name: "foo", Type: &Int{Size: 4}, Offset: 0, BitfieldSize: 1},
{Name: "frob", Type: &Int{Size: 4}, Offset: 4 * 8},
},
},
"type t struct { _ [4]byte /* unsupported bitfield */; frob uint32; }",
},
{
&Struct{
Name: "nested",
Size: 8,
Members: []Member{
{
Name: "foo",
Type: &Struct{
Size: 4,
Members: []Member{
{Name: "bar", Type: &Int{Size: 4}, Offset: 0},
},
},
},
{Name: "frob", Type: &Int{Size: 4}, Offset: 4 * 8},
},
},
"type t struct { foo struct { bar uint32; }; frob uint32; }",
},
{
&Struct{
Name: "nested anon union",
Size: 8,
Members: []Member{
{
Name: "",
Type: &Union{
Size: 4,
Members: []Member{
{Name: "foo", Type: &Int{Size: 4}, Offset: 0},
{Name: "bar", Type: &Int{Size: 4}, Offset: 0},
},
},
},
},
},
"type t struct { foo uint32; _ [4]byte; }",
},
{
&Datasec{
Size: 16,
Vars: []VarSecinfo{
{&Var{Name: "s", Type: &Int{Size: 2}, Linkage: StaticVar}, 0, 2},
{&Var{Name: "g", Type: &Int{Size: 4}, Linkage: GlobalVar}, 4, 4},
{&Var{Name: "e", Type: &Int{Size: 8}, Linkage: ExternVar}, 8, 8},
},
},
"type t struct { _ [4]byte; g uint32; _ [8]byte; }",
},
}
for _, test := range tests {
t.Run(fmt.Sprint(test.typ), func(t *testing.T) {
have := mustGoTypeDeclaration(t, test.typ, nil, nil)
if have != test.output {
t.Errorf("Unexpected output:\n\t-%s\n\t+%s", test.output, have)
}
})
}
}
func TestGoTypeDeclarationNamed(t *testing.T) {
e1 := &Enum{Name: "e1", Size: 4}
s1 := &Struct{
Name: "s1",
Size: 4,
Members: []Member{
{Name: "frob", Type: e1},
},
}
s2 := &Struct{
Name: "s2",
Size: 4,
Members: []Member{
{Name: "frood", Type: s1},
},
}
td := &Typedef{Name: "td", Type: e1}
arr := &Array{Nelems: 1, Type: td}
tests := []struct {
typ Type
named []Type
output string
}{
{e1, []Type{e1}, "type t uint32"},
{s1, []Type{e1, s1}, "type t struct { frob E1; }"},
{s2, []Type{e1}, "type t struct { frood struct { frob E1; }; }"},
{s2, []Type{e1, s1}, "type t struct { frood S1; }"},
{td, nil, "type t uint32"},
{td, []Type{td}, "type t uint32"},
{arr, []Type{td}, "type t [1]TD"},
}
for _, test := range tests {
t.Run(fmt.Sprint(test.typ), func(t *testing.T) {
names := make(map[Type]string)
for _, t := range test.named {
names[t] = strings.ToUpper(t.TypeName())
}
have := mustGoTypeDeclaration(t, test.typ, names, nil)
if have != test.output {
t.Errorf("Unexpected output:\n\t-%s\n\t+%s", test.output, have)
}
})
}
}
func TestGoTypeDeclarationQualifiers(t *testing.T) {
i := &Int{Size: 4}
want := mustGoTypeDeclaration(t, i, nil, nil)
tests := []struct {
typ Type
}{
{&Volatile{Type: i}},
{&Const{Type: i}},
{&Restrict{Type: i}},
}
for _, test := range tests {
t.Run(fmt.Sprint(test.typ), func(t *testing.T) {
have := mustGoTypeDeclaration(t, test.typ, nil, nil)
if have != want {
t.Errorf("Unexpected output:\n\t-%s\n\t+%s", want, have)
}
})
}
}
func TestGoTypeDeclarationCycle(t *testing.T) {
s := &Struct{Name: "cycle"}
s.Members = []Member{{Name: "f", Type: s}}
var gf GoFormatter
_, err := gf.TypeDeclaration("t", s)
if !errors.Is(err, errNestedTooDeep) {
t.Fatal("Expected errNestedTooDeep, got", err)
}
}
func TestRejectBogusTypes(t *testing.T) {
tests := []struct {
typ Type
}{
{&Struct{
Size: 1,
Members: []Member{
{Name: "foo", Type: &Int{Size: 2}, Offset: 0},
},
}},
{&Int{Size: 2, Encoding: Bool}},
{&Int{Size: 1, Encoding: Char | Signed}},
{&Int{Size: 2, Encoding: Char}},
}
for _, test := range tests {
t.Run(fmt.Sprint(test.typ), func(t *testing.T) {
var gf GoFormatter
_, err := gf.TypeDeclaration("t", test.typ)
if err == nil {
t.Fatal("TypeDeclaration does not reject bogus type")
}
})
}
}
func mustGoTypeDeclaration(tb testing.TB, typ Type, names map[Type]string, id func(string) string) string {
tb.Helper()
gf := GoFormatter{
Names: names,
Identifier: id,
}
have, err := gf.TypeDeclaration("t", typ)
if err != nil {
tb.Fatal(err)
}
_, err = format.Source([]byte(have))
if err != nil {
tb.Fatalf("Output can't be formatted: %s\n%s", err, have)
}
return have
}