Fix encoding of marshaler

cover_marshal_json_test.go

@@ -2,6 +2,7 @@ package json_test
 
 import (
 	"bytes"
+	"fmt"
 	"testing"
 
 	"github.com/goccy/go-json"
@@ -12,7 +13,7 @@ type coverMarshalJSON struct {
 }
 
 func (c coverMarshalJSON) MarshalJSON() ([]byte, error) {
-	return []byte(`"hello"`), nil
+	return []byte(fmt.Sprint(c.A)), nil
 }
 
 type coverPtrMarshalJSON struct {
@@ -20,7 +21,22 @@ type coverPtrMarshalJSON struct {
 }
 
 func (c *coverPtrMarshalJSON) MarshalJSON() ([]byte, error) {
-	return []byte(`"hello"`), nil
+	if c == nil {
+		return []byte(`"NULL"`), nil
+	}
+	return []byte(fmt.Sprint(c.B)), nil
+}
+
+type coverPtrMarshalJSONString struct {
+	dummy int
+	C     string
+}
+
+func (c *coverPtrMarshalJSONString) MarshalJSON() ([]byte, error) {
+	if c == nil {
+		return []byte(`"NULL"`), nil
+	}
+	return []byte(c.C), nil
 }
 
 func TestCoverMarshalJSON(t *testing.T) {
@@ -66,6 +82,117 @@ func TestCoverMarshalJSON(t *testing.T) {
 		name string
 		data interface{}
 	}{
+		{
+			name: "MarshalJSON",
+			data: coverMarshalJSON{A: 1},
+		},
+		{
+			name: "PtrMarshalJSON",
+			data: &coverMarshalJSON{A: 1},
+		},
+		{
+			name: "PtrMarshalJSON",
+			data: coverPtrMarshalJSON{B: 1},
+		},
+		{
+			name: "PtrPtrMarshalJSON",
+			data: &coverPtrMarshalJSON{B: 1},
+		},
+		{
+			name: "SliceMarshalJSON",
+			data: []coverMarshalJSON{{A: 1}, {A: 2}},
+		},
+		{
+			name: "SliceAddrMarshalJSON",
+			data: []*coverMarshalJSON{{A: 1}, {A: 2}},
+		},
+		{
+			name: "SlicePtrMarshalJSON",
+			data: []coverPtrMarshalJSON{{B: 1}, {B: 2}},
+		},
+		{
+			name: "SliceAddrPtrMarshalJSON",
+			data: []*coverPtrMarshalJSON{{B: 1}, {B: 2}},
+		},
+		{
+			name: "StructSliceMarshalJSON",
+			data: struct {
+				A []coverMarshalJSON
+			}{A: []coverMarshalJSON{{A: 1}, {A: 2}}},
+		},
+		{
+			name: "StructSliceAddrMarshalJSON",
+			data: struct {
+				A []*coverMarshalJSON
+			}{A: []*coverMarshalJSON{{A: 1}, {A: 2}}},
+		},
+		{
+			name: "StructSlicePtrMarshalJSON",
+			data: struct {
+				A []coverPtrMarshalJSON
+			}{A: []coverPtrMarshalJSON{{B: 1}, {B: 2}}},
+		},
+		{
+			name: "StructSliceAddrPtrMarshalJSON",
+			data: struct {
+				A []*coverPtrMarshalJSON
+			}{A: []*coverPtrMarshalJSON{{B: 1}, {B: 2}}},
+		},
+		{
+			name: "PtrStructSliceMarshalJSON",
+			data: &struct {
+				A []coverMarshalJSON
+			}{A: []coverMarshalJSON{{A: 1}, {A: 2}}},
+		},
+		{
+			name: "PtrStructSliceAddrMarshalJSON",
+			data: &struct {
+				A []*coverMarshalJSON
+			}{A: []*coverMarshalJSON{{A: 1}, {A: 2}}},
+		},
+		{
+			name: "PtrStructSlicePtrMarshalJSON",
+			data: &struct {
+				A []coverPtrMarshalJSON
+			}{A: []coverPtrMarshalJSON{{B: 1}, {B: 2}}},
+		},
+		{
+			name: "PtrStructSlicePtrMarshalJSONString",
+			data: &struct {
+				A []coverPtrMarshalJSONString
+			}{A: []coverPtrMarshalJSONString{{C: "1"}, {C: "2"}}},
+		},
+		{
+			name: "PtrStructSliceAddrPtrMarshalJSONString",
+			data: &struct {
+				A []*coverPtrMarshalJSONString
+			}{A: []*coverPtrMarshalJSONString{{C: "1"}, {C: "2"}}},
+		},
+		{
+			name: "PtrStructArrayPtrMarshalJSONString",
+			data: &struct {
+				A [2]coverPtrMarshalJSONString
+			}{A: [2]coverPtrMarshalJSONString{{C: "1"}, {C: "2"}}},
+		},
+		{
+			name: "PtrStructArrayAddrPtrMarshalJSONString",
+			data: &struct {
+				A [2]*coverPtrMarshalJSONString
+			}{A: [2]*coverPtrMarshalJSONString{{C: "1"}, {C: "2"}}},
+		},
+		{
+			name: "PtrStructMapPtrMarshalJSONString",
+			data: &struct {
+				A map[string]coverPtrMarshalJSONString
+			}{A: map[string]coverPtrMarshalJSONString{"a": {C: "1"}, "b": {C: "2"}}},
+		},
+		{
+			name: "PtrStructMapAddrPtrMarshalJSONString",
+			data: &struct {
+				A map[string]*coverPtrMarshalJSONString
+			}{A: map[string]*coverPtrMarshalJSONString{"a": {C: "1"}, "b": {C: "2"}}},
+		},
+
 		// HeadMarshalJSONZero
 		{
 			name: "HeadMarshalJSONZero",

internal/encoder/compiler.go

@@ -600,10 +600,11 @@ func compileSlice(ctx *compileContext) (*Opcode, error) {
 	header := newSliceHeaderCode(ctx)
 	ctx.incIndex()
 
-	code, err := compileSliceElem(ctx.withType(elem).incIndent())
+	code, err := compileListElem(ctx.withType(elem).incIndent())
 	if err != nil {
 		return nil, err
 	}
+	code.Indirect = true
 
 	// header => opcode => elem => end
 	//             ^        |
@@ -624,7 +625,7 @@ func compileSlice(ctx *compileContext) (*Opcode, error) {
 	return (*Opcode)(unsafe.Pointer(header)), nil
 }
 
-func compileSliceElem(ctx *compileContext) (*Opcode, error) {
+func compileListElem(ctx *compileContext) (*Opcode, error) {
 	typ := ctx.typ
 	switch {
 	case !typ.Implements(marshalJSONType) && runtime.PtrTo(typ).Implements(marshalJSONType):
@@ -645,10 +646,11 @@ func compileArray(ctx *compileContext) (*Opcode, error) {
 	header := newArrayHeaderCode(ctx, alen)
 	ctx.incIndex()
 
-	code, err := compile(ctx.withType(elem).incIndent(), false)
+	code, err := compileListElem(ctx.withType(elem).incIndent())
 	if err != nil {
 		return nil, err
 	}
+	code.Indirect = true
 	// header => opcode => elem => end
 	//             ^        |
 	//             |________|
@@ -690,6 +692,7 @@ func compileMap(ctx *compileContext) (*Opcode, error) {
 	if err != nil {
 		return nil, err
 	}
+	valueCode.Indirect = true
 
 	key := newMapKeyCode(ctx, header)
 	ctx.incIndex()
@@ -1057,10 +1060,11 @@ func compileStruct(ctx *compileContext, isPtr bool) (*Opcode, error) {
 			// *struct{ field T } => struct { field *T }
 			// func (*T) MarshalJSON() ([]byte, error)
 			// move pointer position from head to first field
-			code, err := compileMarshalJSON(ctx.withType(runtime.PtrTo(fieldType)))
+			code, err := compileMarshalJSON(ctx.withType(fieldType))
 			if err != nil {
 				return nil, err
 			}
+			addrForMarshaler = true
 			valueCode = code
 			nilcheck = false
 			indirect = false
@@ -1069,10 +1073,11 @@ func compileStruct(ctx *compileContext, isPtr bool) (*Opcode, error) {
 			// *struct{ field T } => struct { field *T }
 			// func (*T) MarshalText() ([]byte, error)
 			// move pointer position from head to first field
-			code, err := compileMarshalText(ctx.withType(runtime.PtrTo(fieldType)))
+			code, err := compileMarshalText(ctx.withType(fieldType))
 			if err != nil {
 				return nil, err
 			}
+			addrForMarshaler = true
 			valueCode = code
 			nilcheck = false
 			indirect = false

internal/encoder/vm/vm.go

@@ -272,6 +272,9 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
+			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+				p = ptrToPtr(p)
+			}
 			bb, err := appendMarshalJSON(code, b, ptrToInterface(code, p), false)
 			if err != nil {
 				return nil, err
@@ -296,6 +299,9 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
+			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+				p = ptrToPtr(p)
+			}
 			bb, err := appendMarshalText(code, b, ptrToInterface(code, p), false)
 			if err != nil {
 				return nil, err

internal/encoder/vm_escaped/vm.go

@@ -272,6 +272,9 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
+			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+				p = ptrToPtr(p)
+			}
 			bb, err := appendMarshalJSON(code, b, ptrToInterface(code, p), true)
 			if err != nil {
 				return nil, err
@@ -296,6 +299,9 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
+			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+				p = ptrToPtr(p)
+			}
 			bb, err := appendMarshalText(code, b, ptrToInterface(code, p), true)
 			if err != nil {
 				return nil, err

internal/encoder/vm_escaped_indent/vm.go

@@ -270,6 +270,9 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
+			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+				p = ptrToPtr(p)
+			}
 			bb, err := appendMarshalJSON(ctx, code, b, ptrToInterface(code, p), code.Indent, true)
 			if err != nil {
 				return nil, err
@@ -294,6 +297,9 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
+			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+				p = ptrToPtr(p)
+			}
 			bb, err := appendMarshalText(code, b, ptrToInterface(code, p), true)
 			if err != nil {
 				return nil, err

internal/encoder/vm_indent/vm.go

@@ -276,6 +276,9 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
+			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+				p = ptrToPtr(p)
+			}
 			bb, err := appendMarshalJSON(ctx, code, b, ptrToInterface(code, p), code.Indent, false)
 			if err != nil {
 				return nil, err
@@ -300,6 +303,9 @@ func Run(ctx *encoder.RuntimeContext, b []byte, codeSet *encoder.OpcodeSet, opt
 				code = code.Next
 				break
 			}
+			if code.Type.Kind() == reflect.Ptr && code.Indirect {
+				p = ptrToPtr(p)
+			}
 			bb, err := appendMarshalText(code, b, ptrToInterface(code, p), false)
 			if err != nil {
 				return nil, err