gotosocial/vendor/github.com/goccy/go-json/internal/encoder/opcode.go

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package encoder
import (
"bytes"
"fmt"
"sort"
"strings"
"unsafe"
"github.com/goccy/go-json/internal/runtime"
)
const uintptrSize = 4 << (^uintptr(0) >> 63)
type OpFlags uint16
const (
AnonymousHeadFlags OpFlags = 1 << 0
AnonymousKeyFlags OpFlags = 1 << 1
IndirectFlags OpFlags = 1 << 2
IsTaggedKeyFlags OpFlags = 1 << 3
NilCheckFlags OpFlags = 1 << 4
AddrForMarshalerFlags OpFlags = 1 << 5
IsNextOpPtrTypeFlags OpFlags = 1 << 6
IsNilableTypeFlags OpFlags = 1 << 7
MarshalerContextFlags OpFlags = 1 << 8
NonEmptyInterfaceFlags OpFlags = 1 << 9
)
type Opcode struct {
Op OpType // operation type
Idx uint32 // offset to access ptr
Next *Opcode // next opcode
End *Opcode // array/slice/struct/map end
NextField *Opcode // next struct field
Key string // struct field key
Offset uint32 // offset size from struct header
PtrNum uint8 // pointer number: e.g. double pointer is 2.
NumBitSize uint8
Flags OpFlags
Type *runtime.Type // go type
Jmp *CompiledCode // for recursive call
FieldQuery *FieldQuery // field query for Interface / MarshalJSON / MarshalText
ElemIdx uint32 // offset to access array/slice elem
Length uint32 // offset to access slice length or array length
Indent uint32 // indent number
Size uint32 // array/slice elem size
DisplayIdx uint32 // opcode index
DisplayKey string // key text to display
}
func (c *Opcode) Validate() error {
var prevIdx uint32
for code := c; !code.IsEnd(); {
if prevIdx != 0 {
if code.DisplayIdx != prevIdx+1 {
return fmt.Errorf(
"invalid index. previous display index is %d but next is %d. dump = %s",
prevIdx, code.DisplayIdx, c.Dump(),
)
}
}
prevIdx = code.DisplayIdx
code = code.IterNext()
}
return nil
}
func (c *Opcode) IterNext() *Opcode {
if c == nil {
return nil
}
switch c.Op.CodeType() {
case CodeArrayElem, CodeSliceElem, CodeMapKey:
return c.End
default:
return c.Next
}
}
func (c *Opcode) IsEnd() bool {
if c == nil {
return true
}
return c.Op == OpEnd || c.Op == OpInterfaceEnd || c.Op == OpRecursiveEnd
}
func (c *Opcode) MaxIdx() uint32 {
max := uint32(0)
for _, value := range []uint32{
c.Idx,
c.ElemIdx,
c.Length,
c.Size,
} {
if max < value {
max = value
}
}
return max
}
func (c *Opcode) ToHeaderType(isString bool) OpType {
switch c.Op {
case OpInt:
if isString {
return OpStructHeadIntString
}
return OpStructHeadInt
case OpIntPtr:
if isString {
return OpStructHeadIntPtrString
}
return OpStructHeadIntPtr
case OpUint:
if isString {
return OpStructHeadUintString
}
return OpStructHeadUint
case OpUintPtr:
if isString {
return OpStructHeadUintPtrString
}
return OpStructHeadUintPtr
case OpFloat32:
if isString {
return OpStructHeadFloat32String
}
return OpStructHeadFloat32
case OpFloat32Ptr:
if isString {
return OpStructHeadFloat32PtrString
}
return OpStructHeadFloat32Ptr
case OpFloat64:
if isString {
return OpStructHeadFloat64String
}
return OpStructHeadFloat64
case OpFloat64Ptr:
if isString {
return OpStructHeadFloat64PtrString
}
return OpStructHeadFloat64Ptr
case OpString:
if isString {
return OpStructHeadStringString
}
return OpStructHeadString
case OpStringPtr:
if isString {
return OpStructHeadStringPtrString
}
return OpStructHeadStringPtr
case OpNumber:
if isString {
return OpStructHeadNumberString
}
return OpStructHeadNumber
case OpNumberPtr:
if isString {
return OpStructHeadNumberPtrString
}
return OpStructHeadNumberPtr
case OpBool:
if isString {
return OpStructHeadBoolString
}
return OpStructHeadBool
case OpBoolPtr:
if isString {
return OpStructHeadBoolPtrString
}
return OpStructHeadBoolPtr
case OpBytes:
return OpStructHeadBytes
case OpBytesPtr:
return OpStructHeadBytesPtr
case OpMap:
return OpStructHeadMap
case OpMapPtr:
c.Op = OpMap
return OpStructHeadMapPtr
case OpArray:
return OpStructHeadArray
case OpArrayPtr:
c.Op = OpArray
return OpStructHeadArrayPtr
case OpSlice:
return OpStructHeadSlice
case OpSlicePtr:
c.Op = OpSlice
return OpStructHeadSlicePtr
case OpMarshalJSON:
return OpStructHeadMarshalJSON
case OpMarshalJSONPtr:
return OpStructHeadMarshalJSONPtr
case OpMarshalText:
return OpStructHeadMarshalText
case OpMarshalTextPtr:
return OpStructHeadMarshalTextPtr
}
return OpStructHead
}
func (c *Opcode) ToFieldType(isString bool) OpType {
switch c.Op {
case OpInt:
if isString {
return OpStructFieldIntString
}
return OpStructFieldInt
case OpIntPtr:
if isString {
return OpStructFieldIntPtrString
}
return OpStructFieldIntPtr
case OpUint:
if isString {
return OpStructFieldUintString
}
return OpStructFieldUint
case OpUintPtr:
if isString {
return OpStructFieldUintPtrString
}
return OpStructFieldUintPtr
case OpFloat32:
if isString {
return OpStructFieldFloat32String
}
return OpStructFieldFloat32
case OpFloat32Ptr:
if isString {
return OpStructFieldFloat32PtrString
}
return OpStructFieldFloat32Ptr
case OpFloat64:
if isString {
return OpStructFieldFloat64String
}
return OpStructFieldFloat64
case OpFloat64Ptr:
if isString {
return OpStructFieldFloat64PtrString
}
return OpStructFieldFloat64Ptr
case OpString:
if isString {
return OpStructFieldStringString
}
return OpStructFieldString
case OpStringPtr:
if isString {
return OpStructFieldStringPtrString
}
return OpStructFieldStringPtr
case OpNumber:
if isString {
return OpStructFieldNumberString
}
return OpStructFieldNumber
case OpNumberPtr:
if isString {
return OpStructFieldNumberPtrString
}
return OpStructFieldNumberPtr
case OpBool:
if isString {
return OpStructFieldBoolString
}
return OpStructFieldBool
case OpBoolPtr:
if isString {
return OpStructFieldBoolPtrString
}
return OpStructFieldBoolPtr
case OpBytes:
return OpStructFieldBytes
case OpBytesPtr:
return OpStructFieldBytesPtr
case OpMap:
return OpStructFieldMap
case OpMapPtr:
c.Op = OpMap
return OpStructFieldMapPtr
case OpArray:
return OpStructFieldArray
case OpArrayPtr:
c.Op = OpArray
return OpStructFieldArrayPtr
case OpSlice:
return OpStructFieldSlice
case OpSlicePtr:
c.Op = OpSlice
return OpStructFieldSlicePtr
case OpMarshalJSON:
return OpStructFieldMarshalJSON
case OpMarshalJSONPtr:
return OpStructFieldMarshalJSONPtr
case OpMarshalText:
return OpStructFieldMarshalText
case OpMarshalTextPtr:
return OpStructFieldMarshalTextPtr
}
return OpStructField
}
func newOpCode(ctx *compileContext, typ *runtime.Type, op OpType) *Opcode {
return newOpCodeWithNext(ctx, typ, op, newEndOp(ctx, typ))
}
func opcodeOffset(idx int) uint32 {
return uint32(idx) * uintptrSize
}
func getCodeAddrByIdx(head *Opcode, idx uint32) *Opcode {
addr := uintptr(unsafe.Pointer(head)) + uintptr(idx)*unsafe.Sizeof(Opcode{})
return *(**Opcode)(unsafe.Pointer(&addr))
}
func copyOpcode(code *Opcode) *Opcode {
codeNum := ToEndCode(code).DisplayIdx + 1
codeSlice := make([]Opcode, codeNum)
head := (*Opcode)((*runtime.SliceHeader)(unsafe.Pointer(&codeSlice)).Data)
ptr := head
c := code
for {
*ptr = Opcode{
Op: c.Op,
Key: c.Key,
PtrNum: c.PtrNum,
NumBitSize: c.NumBitSize,
Flags: c.Flags,
Idx: c.Idx,
Offset: c.Offset,
Type: c.Type,
FieldQuery: c.FieldQuery,
DisplayIdx: c.DisplayIdx,
DisplayKey: c.DisplayKey,
ElemIdx: c.ElemIdx,
Length: c.Length,
Size: c.Size,
Indent: c.Indent,
Jmp: c.Jmp,
}
if c.End != nil {
ptr.End = getCodeAddrByIdx(head, c.End.DisplayIdx)
}
if c.NextField != nil {
ptr.NextField = getCodeAddrByIdx(head, c.NextField.DisplayIdx)
}
if c.Next != nil {
ptr.Next = getCodeAddrByIdx(head, c.Next.DisplayIdx)
}
if c.IsEnd() {
break
}
ptr = getCodeAddrByIdx(head, c.DisplayIdx+1)
c = c.IterNext()
}
return head
}
func setTotalLengthToInterfaceOp(code *Opcode) {
for c := code; !c.IsEnd(); {
if c.Op == OpInterface || c.Op == OpInterfacePtr {
c.Length = uint32(code.TotalLength())
}
c = c.IterNext()
}
}
func ToEndCode(code *Opcode) *Opcode {
c := code
for !c.IsEnd() {
c = c.IterNext()
}
return c
}
func copyToInterfaceOpcode(code *Opcode) *Opcode {
copied := copyOpcode(code)
c := copied
c = ToEndCode(c)
c.Idx += uintptrSize
c.ElemIdx = c.Idx + uintptrSize
c.Length = c.Idx + 2*uintptrSize
c.Op = OpInterfaceEnd
return copied
}
func newOpCodeWithNext(ctx *compileContext, typ *runtime.Type, op OpType, next *Opcode) *Opcode {
return &Opcode{
Op: op,
Idx: opcodeOffset(ctx.ptrIndex),
Next: next,
Type: typ,
DisplayIdx: ctx.opcodeIndex,
Indent: ctx.indent,
}
}
func newEndOp(ctx *compileContext, typ *runtime.Type) *Opcode {
return newOpCodeWithNext(ctx, typ, OpEnd, nil)
}
func (c *Opcode) TotalLength() int {
var idx int
code := c
for !code.IsEnd() {
maxIdx := int(code.MaxIdx() / uintptrSize)
if idx < maxIdx {
idx = maxIdx
}
if code.Op == OpRecursiveEnd {
break
}
code = code.IterNext()
}
maxIdx := int(code.MaxIdx() / uintptrSize)
if idx < maxIdx {
idx = maxIdx
}
return idx + 1
}
func (c *Opcode) dumpHead(code *Opcode) string {
var length uint32
if code.Op.CodeType() == CodeArrayHead {
length = code.Length
} else {
length = code.Length / uintptrSize
}
return fmt.Sprintf(
`[%03d]%s%s ([idx:%d][elemIdx:%d][length:%d])`,
code.DisplayIdx,
strings.Repeat("-", int(code.Indent)),
code.Op,
code.Idx/uintptrSize,
code.ElemIdx/uintptrSize,
length,
)
}
func (c *Opcode) dumpMapHead(code *Opcode) string {
return fmt.Sprintf(
`[%03d]%s%s ([idx:%d])`,
code.DisplayIdx,
strings.Repeat("-", int(code.Indent)),
code.Op,
code.Idx/uintptrSize,
)
}
func (c *Opcode) dumpMapEnd(code *Opcode) string {
return fmt.Sprintf(
`[%03d]%s%s ([idx:%d])`,
code.DisplayIdx,
strings.Repeat("-", int(code.Indent)),
code.Op,
code.Idx/uintptrSize,
)
}
func (c *Opcode) dumpElem(code *Opcode) string {
var length uint32
if code.Op.CodeType() == CodeArrayElem {
length = code.Length
} else {
length = code.Length / uintptrSize
}
return fmt.Sprintf(
`[%03d]%s%s ([idx:%d][elemIdx:%d][length:%d][size:%d])`,
code.DisplayIdx,
strings.Repeat("-", int(code.Indent)),
code.Op,
code.Idx/uintptrSize,
code.ElemIdx/uintptrSize,
length,
code.Size,
)
}
func (c *Opcode) dumpField(code *Opcode) string {
return fmt.Sprintf(
`[%03d]%s%s ([idx:%d][key:%s][offset:%d])`,
code.DisplayIdx,
strings.Repeat("-", int(code.Indent)),
code.Op,
code.Idx/uintptrSize,
code.DisplayKey,
code.Offset,
)
}
func (c *Opcode) dumpKey(code *Opcode) string {
return fmt.Sprintf(
`[%03d]%s%s ([idx:%d])`,
code.DisplayIdx,
strings.Repeat("-", int(code.Indent)),
code.Op,
code.Idx/uintptrSize,
)
}
func (c *Opcode) dumpValue(code *Opcode) string {
return fmt.Sprintf(
`[%03d]%s%s ([idx:%d])`,
code.DisplayIdx,
strings.Repeat("-", int(code.Indent)),
code.Op,
code.Idx/uintptrSize,
)
}
func (c *Opcode) Dump() string {
codes := []string{}
for code := c; !code.IsEnd(); {
switch code.Op.CodeType() {
case CodeSliceHead:
codes = append(codes, c.dumpHead(code))
code = code.Next
case CodeMapHead:
codes = append(codes, c.dumpMapHead(code))
code = code.Next
case CodeArrayElem, CodeSliceElem:
codes = append(codes, c.dumpElem(code))
code = code.End
case CodeMapKey:
codes = append(codes, c.dumpKey(code))
code = code.End
case CodeMapValue:
codes = append(codes, c.dumpValue(code))
code = code.Next
case CodeMapEnd:
codes = append(codes, c.dumpMapEnd(code))
code = code.Next
case CodeStructField:
codes = append(codes, c.dumpField(code))
code = code.Next
case CodeStructEnd:
codes = append(codes, c.dumpField(code))
code = code.Next
default:
codes = append(codes, fmt.Sprintf(
"[%03d]%s%s ([idx:%d])",
code.DisplayIdx,
strings.Repeat("-", int(code.Indent)),
code.Op,
code.Idx/uintptrSize,
))
code = code.Next
}
}
return strings.Join(codes, "\n")
}
func (c *Opcode) DumpDOT() string {
type edge struct {
from, to *Opcode
label string
weight int
}
var edges []edge
b := &bytes.Buffer{}
fmt.Fprintf(b, "digraph \"%p\" {\n", c.Type)
fmt.Fprintln(b, "mclimit=1.5;\nrankdir=TD;\nordering=out;\nnode[shape=box];")
for code := c; !code.IsEnd(); {
label := code.Op.String()
fmt.Fprintf(b, "\"%p\" [label=%q];\n", code, label)
if p := code.Next; p != nil {
edges = append(edges, edge{
from: code,
to: p,
label: "Next",
weight: 10,
})
}
if p := code.NextField; p != nil {
edges = append(edges, edge{
from: code,
to: p,
label: "NextField",
weight: 2,
})
}
if p := code.End; p != nil {
edges = append(edges, edge{
from: code,
to: p,
label: "End",
weight: 1,
})
}
if p := code.Jmp; p != nil {
edges = append(edges, edge{
from: code,
to: p.Code,
label: "Jmp",
weight: 1,
})
}
switch code.Op.CodeType() {
case CodeSliceHead:
code = code.Next
case CodeMapHead:
code = code.Next
case CodeArrayElem, CodeSliceElem:
code = code.End
case CodeMapKey:
code = code.End
case CodeMapValue:
code = code.Next
case CodeMapEnd:
code = code.Next
case CodeStructField:
code = code.Next
case CodeStructEnd:
code = code.Next
default:
code = code.Next
}
if code.IsEnd() {
fmt.Fprintf(b, "\"%p\" [label=%q];\n", code, code.Op.String())
}
}
sort.Slice(edges, func(i, j int) bool {
return edges[i].to.DisplayIdx < edges[j].to.DisplayIdx
})
for _, e := range edges {
fmt.Fprintf(b, "\"%p\" -> \"%p\" [label=%q][weight=%d];\n", e.from, e.to, e.label, e.weight)
}
fmt.Fprint(b, "}")
return b.String()
}
func newSliceHeaderCode(ctx *compileContext, typ *runtime.Type) *Opcode {
idx := opcodeOffset(ctx.ptrIndex)
ctx.incPtrIndex()
elemIdx := opcodeOffset(ctx.ptrIndex)
ctx.incPtrIndex()
length := opcodeOffset(ctx.ptrIndex)
return &Opcode{
Op: OpSlice,
Type: typ,
Idx: idx,
DisplayIdx: ctx.opcodeIndex,
ElemIdx: elemIdx,
Length: length,
Indent: ctx.indent,
}
}
func newSliceElemCode(ctx *compileContext, typ *runtime.Type, head *Opcode, size uintptr) *Opcode {
return &Opcode{
Op: OpSliceElem,
Type: typ,
Idx: head.Idx,
DisplayIdx: ctx.opcodeIndex,
ElemIdx: head.ElemIdx,
Length: head.Length,
Indent: ctx.indent,
Size: uint32(size),
}
}
func newArrayHeaderCode(ctx *compileContext, typ *runtime.Type, alen int) *Opcode {
idx := opcodeOffset(ctx.ptrIndex)
ctx.incPtrIndex()
elemIdx := opcodeOffset(ctx.ptrIndex)
return &Opcode{
Op: OpArray,
Type: typ,
Idx: idx,
DisplayIdx: ctx.opcodeIndex,
ElemIdx: elemIdx,
Indent: ctx.indent,
Length: uint32(alen),
}
}
func newArrayElemCode(ctx *compileContext, typ *runtime.Type, head *Opcode, length int, size uintptr) *Opcode {
return &Opcode{
Op: OpArrayElem,
Type: typ,
Idx: head.Idx,
DisplayIdx: ctx.opcodeIndex,
ElemIdx: head.ElemIdx,
Length: uint32(length),
Indent: ctx.indent,
Size: uint32(size),
}
}
func newMapHeaderCode(ctx *compileContext, typ *runtime.Type) *Opcode {
idx := opcodeOffset(ctx.ptrIndex)
ctx.incPtrIndex()
return &Opcode{
Op: OpMap,
Type: typ,
Idx: idx,
DisplayIdx: ctx.opcodeIndex,
Indent: ctx.indent,
}
}
func newMapKeyCode(ctx *compileContext, typ *runtime.Type, head *Opcode) *Opcode {
return &Opcode{
Op: OpMapKey,
Type: typ,
Idx: head.Idx,
DisplayIdx: ctx.opcodeIndex,
Indent: ctx.indent,
}
}
func newMapValueCode(ctx *compileContext, typ *runtime.Type, head *Opcode) *Opcode {
return &Opcode{
Op: OpMapValue,
Type: typ,
Idx: head.Idx,
DisplayIdx: ctx.opcodeIndex,
Indent: ctx.indent,
}
}
func newMapEndCode(ctx *compileContext, typ *runtime.Type, head *Opcode) *Opcode {
return &Opcode{
Op: OpMapEnd,
Type: typ,
Idx: head.Idx,
DisplayIdx: ctx.opcodeIndex,
Indent: ctx.indent,
Next: newEndOp(ctx, typ),
}
}
func newRecursiveCode(ctx *compileContext, typ *runtime.Type, jmp *CompiledCode) *Opcode {
return &Opcode{
Op: OpRecursive,
Type: typ,
Idx: opcodeOffset(ctx.ptrIndex),
Next: newEndOp(ctx, typ),
DisplayIdx: ctx.opcodeIndex,
Indent: ctx.indent,
Jmp: jmp,
}
}