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package gotypes
import (
"errors"
"go/token"
"go/types"
"strings"
"testing"
"github.com/mmcloughlin/avo/operand"
"github.com/mmcloughlin/avo/reg"
)
func TestBasicKindsArePrimitive(t *testing.T) {
kinds := []types.BasicKind{
types.Bool,
types.Int,
types.Int8,
types.Int16,
types.Int32,
types.Int64,
types.Uint,
types.Uint8,
types.Uint16,
types.Uint32,
types.Uint64,
types.Uintptr,
types.Float32,
types.Float64,
}
for _, k := range kinds {
AssertPrimitive(t, types.Typ[k])
}
}
func TestPointersArePrimitive(t *testing.T) {
typ := types.NewPointer(types.Typ[types.Uint32])
AssertPrimitive(t, typ)
}
func AssertPrimitive(t *testing.T, typ types.Type) {
t.Helper()
c := NewComponent(typ, operand.NewParamAddr("primitive", 0))
if _, err := c.Resolve(); err != nil {
t.Errorf("expected type %s to be primitive: got error '%s'", typ, err)
}
}
func TestComponentErrors(t *testing.T) {
comp := NewComponent(types.Typ[types.Uint32], operand.Mem{})
cases := []struct {
Component Component
ErrorSubstring string
}{
{comp.Base(), "only slices and strings"},
{comp.Len(), "only slices and strings"},
{comp.Cap(), "only slices have"},
{comp.Real(), "only complex"},
{comp.Imag(), "only complex"},
{comp.Index(42), "not array type"},
{comp.Field("a"), "not struct type"},
{comp.Dereference(reg.R12), "not pointer type"},
}
for _, c := range cases {
_, err := c.Component.Resolve()
if err == nil {
t.Fatal("expected error")
}
if !strings.Contains(err.Error(), c.ErrorSubstring) {
t.Fatalf("error message %q; expected substring %q", err.Error(), c.ErrorSubstring)
}
}
}
func TestComponentErrorChaining(t *testing.T) {
// Build a component with an error.
comp := NewComponent(types.Typ[types.Uint32], operand.Mem{}).Index(3)
_, expect := comp.Resolve()
if expect == nil {
t.Fatal("expected error")
}
// Confirm that the error is preserved through chaining operations.
cases := []Component{
comp.Dereference(reg.R13),
comp.Base(),
comp.Len(),
comp.Cap(),
comp.Real(),
comp.Imag(),
comp.Index(42),
comp.Field("field"),
}
for _, c := range cases {
_, err := c.Resolve()
if !errors.Is(err, expect) {
t.Fatal("chaining should preserve error")
}
}
}
func TestComponentDeconstruction(t *testing.T) {
cases := []struct {
Name string
Type types.Type
Chain func(Component) Component
Param string
Offset int
}{
{
Name: "slice_base",
Type: types.NewSlice(types.Typ[types.Uint64]),
Chain: func(c Component) Component { return c.Base() },
Param: "base",
Offset: 0,
},
{
Name: "slice_len",
Type: types.NewSlice(types.Typ[types.Uint64]),
Chain: func(c Component) Component { return c.Len() },
Param: "len",
Offset: 8,
},
{
Name: "slice_cap",
Type: types.NewSlice(types.Typ[types.Uint64]),
Chain: func(c Component) Component { return c.Cap() },
Param: "cap",
Offset: 16,
},
{
Name: "string_base",
Type: types.Typ[types.String],
Chain: func(c Component) Component { return c.Base() },
Param: "base",
Offset: 0,
},
{
Name: "slice_len",
Type: types.Typ[types.String],
Chain: func(c Component) Component { return c.Len() },
Param: "len",
Offset: 8,
},
{
Name: "complex64_real",
Type: types.Typ[types.Complex64],
Chain: func(c Component) Component { return c.Real() },
Param: "real",
Offset: 0,
},
{
Name: "complex64_imag",
Type: types.Typ[types.Complex64],
Chain: func(c Component) Component { return c.Imag() },
Param: "imag",
Offset: 4,
},
{
Name: "complex128_real",
Type: types.Typ[types.Complex128],
Chain: func(c Component) Component { return c.Real() },
Param: "real",
Offset: 0,
},
{
Name: "complex128_imag",
Type: types.Typ[types.Complex128],
Chain: func(c Component) Component { return c.Imag() },
Param: "imag",
Offset: 8,
},
{
Name: "array",
Type: types.NewArray(types.Typ[types.Uint32], 7),
Chain: func(c Component) Component { return c.Index(3) },
Param: "3",
Offset: 12,
},
{
Name: "struct",
Type: types.NewStruct([]*types.Var{
types.NewField(token.NoPos, nil, "Byte", types.Typ[types.Byte], false),
types.NewField(token.NoPos, nil, "Uint64", types.Typ[types.Uint64], false),
}, nil),
Chain: func(c Component) Component { return c.Field("Uint64") },
Param: "Uint64",
Offset: 8,
},
}
// For every test case, generate the same case but when the type is wrapped in
// a named type.
n := len(cases)
for i := 0; i < n; i++ {
wrapped := cases[i]
wrapped.Name += "_wrapped"
wrapped.Type = types.NewNamed(
types.NewTypeName(token.NoPos, nil, "wrapped", nil),
wrapped.Type,
nil,
)
cases = append(cases, wrapped)
}
for _, c := range cases {
c := c // avoid scopelint error
t.Run(c.Name, func(t *testing.T) {
t.Log(c.Type)
base := operand.NewParamAddr("test", 0)
comp := NewComponent(c.Type, base)
comp = c.Chain(comp)
b, err := comp.Resolve()
if err != nil {
t.Fatal(err)
}
expectname := "test_" + c.Param
if b.Addr.Symbol.Name != expectname {
t.Errorf("parameter name %q; expected %q", b.Addr.Symbol.Name, expectname)
}
if b.Addr.Disp != c.Offset {
t.Errorf("offset %d; expected %d", b.Addr.Disp, c.Offset)
}
})
}
}
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