Merge pull request #162 from goccy/feature/fix-marshaler

Fix encoding of MarshalJSON of function type

cover_marshal_json_test.go

@@ -39,6 +39,16 @@ func (c *coverPtrMarshalJSONString) MarshalJSON() ([]byte, error) {
 	return []byte(c.C), nil
 }
 
+type coverFuncMarshalJSON func()
+
+func (f coverFuncMarshalJSON) MarshalJSON() ([]byte, error) {
+	if f == nil {
+		return []byte(`null`), nil
+	}
+	f()
+	return []byte(`"func"`), nil
+}
+
 func TestCoverMarshalJSON(t *testing.T) {
 	type structMarshalJSON struct {
 		A coverMarshalJSON `json:"a"`
@@ -82,6 +92,31 @@ func TestCoverMarshalJSON(t *testing.T) {
 		name string
 		data interface{}
 	}{
+		{
+			name: "FuncMarshalJSON",
+			data: coverFuncMarshalJSON(func() {}),
+		},
+		{
+			name: "StructFuncMarshalJSON",
+			data: struct {
+				A coverFuncMarshalJSON
+			}{A: func() {}},
+		},
+		{
+			name: "StructFuncMarshalJSONMultiFields",
+			data: struct {
+				A coverFuncMarshalJSON
+				B coverFuncMarshalJSON
+			}{A: func() {}, B: func() {}},
+		},
+		{
+			name: "PtrStructFuncMarshalJSONMultiFields",
+			data: &struct {
+				A coverFuncMarshalJSON
+				B coverFuncMarshalJSON
+				C coverFuncMarshalJSON
+			}{A: func() {}, B: nil, C: func() {}},
+		},
 		{
 			name: "MarshalJSON",
 			data: coverMarshalJSON{A: 1},
@@ -3652,6 +3687,7 @@ func TestCoverMarshalJSON(t *testing.T) {
 		},
 	}
 	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
 			for _, indent := range []bool{true, false} {
 				for _, htmlEscape := range []bool{true, false} {
 					var buf bytes.Buffer
@@ -3669,5 +3705,6 @@ func TestCoverMarshalJSON(t *testing.T) {
 					}
 				}
 			}
+		})
 	}
 }

internal/encoder/compiler.go

@@ -506,6 +506,7 @@ func compileMarshalJSON(ctx *compileContext) (*Opcode, error) {
 	if !typ.Implements(marshalJSONType) && runtime.PtrTo(typ).Implements(marshalJSONType) {
 		code.AddrForMarshaler = true
 	}
+	code.IsNilableType = isNilableType(typ)
 	ctx.incIndex()
 	return code, nil
 }
@@ -516,6 +517,7 @@ func compileMarshalText(ctx *compileContext) (*Opcode, error) {
 	if !typ.Implements(marshalTextType) && runtime.PtrTo(typ).Implements(marshalTextType) {
 		code.AddrForMarshaler = true
 	}
+	code.IsNilableType = isNilableType(typ)
 	ctx.incIndex()
 	return code, nil
 }
@@ -1274,12 +1276,10 @@ func isNilableType(typ *runtime.Type) bool {
 	switch typ.Kind() {
 	case reflect.Ptr:
 		return true
-	case reflect.Interface:
-		return true
-	case reflect.Slice:
-		return true
 	case reflect.Map:
 		return true
+	case reflect.Func:
+		return true
 	default:
 		return false
 	}
@@ -1418,6 +1418,7 @@ func compileStruct(ctx *compileContext, isPtr bool) (*Opcode, error) {
 			Nilcheck:         nilcheck,
 			AddrForMarshaler: addrForMarshaler,
 			IsNextOpPtrType:  strings.Contains(valueCode.Op.String(), "Ptr"),
+			IsNilableType:    isNilableType,
 		}
 		if fieldIdx == 0 {
 			fieldCode.HeadIdx = fieldCode.Idx

internal/encoder/encoder.go

@@ -559,7 +559,7 @@ func AppendIndent(ctx *RuntimeContext, b []byte, indent int) []byte {
 func IsNilForMarshaler(v interface{}) bool {
 	rv := reflect.ValueOf(v)
 	switch rv.Kind() {
-	case reflect.Interface, reflect.Map, reflect.Ptr:
+	case reflect.Interface, reflect.Map, reflect.Ptr, reflect.Func:
 		return rv.IsNil()
 	case reflect.Slice:
 		return rv.IsNil() || rv.Len() == 0

internal/encoder/opcode.go

@@ -26,6 +26,7 @@ type Opcode struct {
 	Nilcheck         bool          // whether needs to nilcheck or not
 	AddrForMarshaler bool          // whether needs to addr for marshaler or not
 	IsNextOpPtrType  bool          // whether next operation is ptr type or not
+	IsNilableType    bool          // whether type is nilable or not
 	RshiftNum        uint8         // use to take bit for judging whether negative integer or not
 	Mask             uint64        // mask for number
 	Indent           int           // indent number
@@ -242,6 +243,7 @@ func (c *Opcode) copy(codeMap map[uintptr]*Opcode) *Opcode {
 		Nilcheck:         c.Nilcheck,
 		AddrForMarshaler: c.AddrForMarshaler,
 		IsNextOpPtrType:  c.IsNextOpPtrType,
+		IsNilableType:    c.IsNilableType,
 		Indent:           c.Indent,
 		Idx:              c.Idx,
 		HeadIdx:          c.HeadIdx,

internal/encoder/vm/vm.go

@@ -3,7 +3,6 @@ package vm
 import (
 	"fmt"
 	"math"
-	"reflect"
 	"sort"
 	"unsafe"
 
@@ -271,7 +270,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
-			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+			if code.IsNilableType && code.Indirect {
 				p = ptrToPtr(p)
 			}
 			bb, err := appendMarshalJSON(code, b, ptrToInterface(code, p), false)
@@ -298,7 +297,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
-			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+			if code.IsNilableType && code.Indirect {
 				p = ptrToPtr(p)
 			}
 			bb, err := appendMarshalText(code, b, ptrToInterface(code, p), false)
@@ -2711,7 +2710,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				b = append(b, '{')
 			}
 			b = append(b, code.Key...)
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadMarshalJSON {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -2755,7 +2754,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				b = append(b, '{')
 			}
 			b = append(b, code.Key...)
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadStringTagMarshalJSON {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -2798,7 +2797,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			if !code.AnonymousHead {
 				b = append(b, '{')
 			}
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadOmitEmptyMarshalJSON {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -2924,7 +2923,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				b = append(b, '{')
 			}
 			b = append(b, code.Key...)
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadMarshalText {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -2968,7 +2967,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				b = append(b, '{')
 			}
 			b = append(b, code.Key...)
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadStringTagMarshalText {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -3011,7 +3010,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			if !code.AnonymousHead {
 				b = append(b, '{')
 			}
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadOmitEmptyMarshalText {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -3623,7 +3622,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			p := load(ctxptr, code.HeadIdx)
 			b = append(b, code.Key...)
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {
@@ -3640,7 +3639,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 		case encoder.OpStructFieldOmitEmptyMarshalJSON:
 			p := load(ctxptr, code.HeadIdx)
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {
@@ -3685,7 +3684,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			p := load(ctxptr, code.HeadIdx)
 			b = append(b, code.Key...)
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {
@@ -3702,7 +3701,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 		case encoder.OpStructFieldOmitEmptyMarshalText:
 			p := load(ctxptr, code.HeadIdx)
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {

internal/encoder/vm_escaped/vm.go

@@ -3,7 +3,6 @@ package vm_escaped
 import (
 	"fmt"
 	"math"
-	"reflect"
 	"sort"
 	"unsafe"
 
@@ -271,7 +270,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
-			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+			if code.IsNilableType && code.Indirect {
 				p = ptrToPtr(p)
 			}
 			bb, err := appendMarshalJSON(code, b, ptrToInterface(code, p), true)
@@ -298,7 +297,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
-			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+			if code.IsNilableType && code.Indirect {
 				p = ptrToPtr(p)
 			}
 			bb, err := appendMarshalText(code, b, ptrToInterface(code, p), true)
@@ -2711,7 +2710,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				b = append(b, '{')
 			}
 			b = append(b, code.EscapedKey...)
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadMarshalJSON {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -2755,7 +2754,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				b = append(b, '{')
 			}
 			b = append(b, code.EscapedKey...)
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadStringTagMarshalJSON {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -2798,7 +2797,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			if !code.AnonymousHead {
 				b = append(b, '{')
 			}
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadOmitEmptyMarshalJSON {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -2924,7 +2923,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				b = append(b, '{')
 			}
 			b = append(b, code.EscapedKey...)
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadMarshalText {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -2968,7 +2967,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				b = append(b, '{')
 			}
 			b = append(b, code.EscapedKey...)
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadStringTagMarshalText {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -3011,7 +3010,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			if !code.AnonymousHead {
 				b = append(b, '{')
 			}
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadOmitEmptyMarshalText {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -3623,7 +3622,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			p := load(ctxptr, code.HeadIdx)
 			b = append(b, code.EscapedKey...)
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {
@@ -3640,7 +3639,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 		case encoder.OpStructFieldOmitEmptyMarshalJSON:
 			p := load(ctxptr, code.HeadIdx)
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {
@@ -3685,7 +3684,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			p := load(ctxptr, code.HeadIdx)
 			b = append(b, code.EscapedKey...)
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {
@@ -3702,7 +3701,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 		case encoder.OpStructFieldOmitEmptyMarshalText:
 			p := load(ctxptr, code.HeadIdx)
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {

internal/encoder/vm_escaped_indent/vm.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"fmt"
 	"math"
-	"reflect"
 	"sort"
 	"unsafe"
 
@@ -269,7 +268,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
-			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+			if code.IsNilableType && code.Indirect {
 				p = ptrToPtr(p)
 			}
 			bb, err := appendMarshalJSON(ctx, code, b, ptrToInterface(code, p), code.Indent, true)
@@ -296,7 +295,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
-			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+			if code.IsNilableType && code.Indirect {
 				p = ptrToPtr(p)
 			}
 			bb, err := appendMarshalText(code, b, ptrToInterface(code, p), true)
@@ -2844,7 +2843,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			b = appendIndent(ctx, b, code.Indent+1)
 			b = append(b, code.EscapedKey...)
 			b = append(b, ' ')
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadMarshalJSON {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -2890,7 +2889,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			b = appendIndent(ctx, b, code.Indent+1)
 			b = append(b, code.EscapedKey...)
 			b = append(b, ' ')
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadStringTagMarshalJSON {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -2933,7 +2932,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			if !code.AnonymousHead {
 				b = append(b, '{', '\n')
 			}
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadOmitEmptyMarshalJSON {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -3067,7 +3066,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			b = appendIndent(ctx, b, code.Indent+1)
 			b = append(b, code.EscapedKey...)
 			b = append(b, ' ')
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadMarshalText {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -3113,7 +3112,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			b = appendIndent(ctx, b, code.Indent+1)
 			b = append(b, code.EscapedKey...)
 			b = append(b, ' ')
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadStringTagMarshalText {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -3156,7 +3155,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			if !code.AnonymousHead {
 				b = append(b, '{', '\n')
 			}
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadOmitEmptyMarshalText {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -3870,7 +3869,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			b = append(b, ' ')
 			p := load(ctxptr, code.HeadIdx)
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {
@@ -3887,7 +3886,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 		case encoder.OpStructFieldOmitEmptyMarshalJSON:
 			p := load(ctxptr, code.HeadIdx)
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {
@@ -3940,7 +3939,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			b = append(b, code.EscapedKey...)
 			b = append(b, ' ')
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {
@@ -3957,7 +3956,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 		case encoder.OpStructFieldOmitEmptyMarshalText:
 			p := load(ctxptr, code.HeadIdx)
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {

internal/encoder/vm_indent/vm.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"fmt"
 	"math"
-	"reflect"
 	"sort"
 	"unsafe"
 
@@ -275,7 +274,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
-			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+			if code.IsNilableType && code.Indirect {
 				p = ptrToPtr(p)
 			}
 			bb, err := appendMarshalJSON(ctx, code, b, ptrToInterface(code, p), code.Indent, false)
@@ -302,7 +301,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
-			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+			if code.IsNilableType && code.Indirect {
 				p = ptrToPtr(p)
 			}
 			bb, err := appendMarshalText(code, b, ptrToInterface(code, p), false)
@@ -2850,7 +2849,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			b = appendIndent(ctx, b, code.Indent+1)
 			b = append(b, code.Key...)
 			b = append(b, ' ')
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadMarshalJSON {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -2896,7 +2895,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			b = appendIndent(ctx, b, code.Indent+1)
 			b = append(b, code.Key...)
 			b = append(b, ' ')
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadStringTagMarshalJSON {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -2939,7 +2938,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			if !code.AnonymousHead {
 				b = append(b, '{', '\n')
 			}
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadOmitEmptyMarshalJSON {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -3073,7 +3072,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			b = appendIndent(ctx, b, code.Indent+1)
 			b = append(b, code.Key...)
 			b = append(b, ' ')
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadMarshalText {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -3119,7 +3118,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			b = appendIndent(ctx, b, code.Indent+1)
 			b = append(b, code.Key...)
 			b = append(b, ' ')
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadStringTagMarshalText {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -3162,7 +3161,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			if !code.AnonymousHead {
 				b = append(b, '{', '\n')
 			}
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				if code.Indirect || code.Op == encoder.OpStructPtrHeadOmitEmptyMarshalText {
 					p = ptrToPtr(p + code.Offset)
 				}
@@ -3876,7 +3875,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			b = append(b, ' ')
 			p := load(ctxptr, code.HeadIdx)
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {
@@ -3893,7 +3892,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 		case encoder.OpStructFieldOmitEmptyMarshalJSON:
 			p := load(ctxptr, code.HeadIdx)
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {
@@ -3946,7 +3945,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 			b = append(b, code.Key...)
 			b = append(b, ' ')
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {
@@ -3963,7 +3962,7 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 		case encoder.OpStructFieldOmitEmptyMarshalText:
 			p := load(ctxptr, code.HeadIdx)
 			p += code.Offset
-			if code.Type.Kind() == reflect.Ptr {
+			if code.IsNilableType {
 				p = ptrToPtr(p)
 			}
 			if p == 0 && code.Nilcheck {