forked from mirrors/gotosocial
216 lines
6 KiB
Go
216 lines
6 KiB
Go
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package vm
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import (
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"encoding/json"
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"fmt"
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"unsafe"
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"github.com/goccy/go-json/internal/encoder"
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"github.com/goccy/go-json/internal/runtime"
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)
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const uintptrSize = 4 << (^uintptr(0) >> 63)
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var (
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appendInt = encoder.AppendInt
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appendUint = encoder.AppendUint
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appendFloat32 = encoder.AppendFloat32
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appendFloat64 = encoder.AppendFloat64
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appendString = encoder.AppendString
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appendByteSlice = encoder.AppendByteSlice
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appendNumber = encoder.AppendNumber
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errUnsupportedValue = encoder.ErrUnsupportedValue
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errUnsupportedFloat = encoder.ErrUnsupportedFloat
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mapiterinit = encoder.MapIterInit
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mapiterkey = encoder.MapIterKey
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mapitervalue = encoder.MapIterValue
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mapiternext = encoder.MapIterNext
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maplen = encoder.MapLen
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)
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type emptyInterface struct {
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typ *runtime.Type
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ptr unsafe.Pointer
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}
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func errUnimplementedOp(op encoder.OpType) error {
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return fmt.Errorf("encoder: opcode %s has not been implemented", op)
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}
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func load(base uintptr, idx uintptr) uintptr {
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addr := base + idx
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return **(**uintptr)(unsafe.Pointer(&addr))
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}
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func store(base uintptr, idx uintptr, p uintptr) {
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addr := base + idx
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**(**uintptr)(unsafe.Pointer(&addr)) = p
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}
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func loadNPtr(base uintptr, idx uintptr, ptrNum int) uintptr {
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addr := base + idx
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p := **(**uintptr)(unsafe.Pointer(&addr))
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for i := 0; i < ptrNum; i++ {
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if p == 0 {
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return 0
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}
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p = ptrToPtr(p)
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}
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return p
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}
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func ptrToUint64(p uintptr) uint64 { return **(**uint64)(unsafe.Pointer(&p)) }
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func ptrToFloat32(p uintptr) float32 { return **(**float32)(unsafe.Pointer(&p)) }
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func ptrToFloat64(p uintptr) float64 { return **(**float64)(unsafe.Pointer(&p)) }
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func ptrToBool(p uintptr) bool { return **(**bool)(unsafe.Pointer(&p)) }
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func ptrToBytes(p uintptr) []byte { return **(**[]byte)(unsafe.Pointer(&p)) }
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func ptrToNumber(p uintptr) json.Number { return **(**json.Number)(unsafe.Pointer(&p)) }
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func ptrToString(p uintptr) string { return **(**string)(unsafe.Pointer(&p)) }
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func ptrToSlice(p uintptr) *runtime.SliceHeader { return *(**runtime.SliceHeader)(unsafe.Pointer(&p)) }
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func ptrToPtr(p uintptr) uintptr {
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return uintptr(**(**unsafe.Pointer)(unsafe.Pointer(&p)))
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}
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func ptrToNPtr(p uintptr, ptrNum int) uintptr {
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for i := 0; i < ptrNum; i++ {
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if p == 0 {
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return 0
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}
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p = ptrToPtr(p)
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}
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return p
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}
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func ptrToUnsafePtr(p uintptr) unsafe.Pointer {
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return *(*unsafe.Pointer)(unsafe.Pointer(&p))
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}
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func ptrToInterface(code *encoder.Opcode, p uintptr) interface{} {
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return *(*interface{})(unsafe.Pointer(&emptyInterface{
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typ: code.Type,
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ptr: *(*unsafe.Pointer)(unsafe.Pointer(&p)),
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}))
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}
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func appendBool(b []byte, v bool) []byte {
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if v {
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return append(b, "true"...)
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}
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return append(b, "false"...)
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}
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func appendNull(b []byte) []byte {
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return append(b, "null"...)
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}
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func appendComma(b []byte) []byte {
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return append(b, ',')
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}
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func appendColon(b []byte) []byte {
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last := len(b) - 1
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b[last] = ':'
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return b
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}
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func appendMapKeyValue(_ *encoder.RuntimeContext, _ *encoder.Opcode, b, key, value []byte) []byte {
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b = append(b, key...)
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b[len(b)-1] = ':'
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return append(b, value...)
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}
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func appendMapEnd(_ *encoder.RuntimeContext, _ *encoder.Opcode, b []byte) []byte {
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b[len(b)-1] = '}'
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b = append(b, ',')
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return b
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}
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func appendInterface(ctx *encoder.RuntimeContext, codeSet *encoder.OpcodeSet, opt encoder.Option, _ *encoder.Opcode, b []byte, iface *emptyInterface, ptrOffset uintptr) ([]byte, error) {
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ctx.KeepRefs = append(ctx.KeepRefs, unsafe.Pointer(iface))
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ifaceCodeSet, err := encoder.CompileToGetCodeSet(uintptr(unsafe.Pointer(iface.typ)))
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if err != nil {
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return nil, err
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}
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totalLength := uintptr(codeSet.CodeLength)
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nextTotalLength := uintptr(ifaceCodeSet.CodeLength)
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curlen := uintptr(len(ctx.Ptrs))
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offsetNum := ptrOffset / uintptrSize
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newLen := offsetNum + totalLength + nextTotalLength
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if curlen < newLen {
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ctx.Ptrs = append(ctx.Ptrs, make([]uintptr, newLen-curlen)...)
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}
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oldPtrs := ctx.Ptrs
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newPtrs := ctx.Ptrs[(ptrOffset+totalLength*uintptrSize)/uintptrSize:]
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newPtrs[0] = uintptr(iface.ptr)
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ctx.Ptrs = newPtrs
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bb, err := Run(ctx, b, ifaceCodeSet, opt)
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if err != nil {
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return nil, err
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}
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ctx.Ptrs = oldPtrs
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return bb, nil
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}
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func appendMarshalJSON(ctx *encoder.RuntimeContext, code *encoder.Opcode, b []byte, v interface{}) ([]byte, error) {
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return encoder.AppendMarshalJSON(ctx, code, b, v, false)
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}
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func appendMarshalText(code *encoder.Opcode, b []byte, v interface{}) ([]byte, error) {
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return encoder.AppendMarshalText(code, b, v, false)
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}
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func appendArrayHead(_ *encoder.RuntimeContext, _ *encoder.Opcode, b []byte) []byte {
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return append(b, '[')
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}
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func appendArrayEnd(_ *encoder.RuntimeContext, _ *encoder.Opcode, b []byte) []byte {
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last := len(b) - 1
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b[last] = ']'
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return append(b, ',')
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}
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func appendEmptyArray(b []byte) []byte {
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return append(b, '[', ']', ',')
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}
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func appendEmptyObject(b []byte) []byte {
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return append(b, '{', '}', ',')
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}
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func appendObjectEnd(_ *encoder.RuntimeContext, _ *encoder.Opcode, b []byte) []byte {
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last := len(b) - 1
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b[last] = '}'
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return append(b, ',')
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}
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func appendStructHead(b []byte) []byte {
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return append(b, '{')
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}
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func appendStructKey(_ *encoder.RuntimeContext, code *encoder.Opcode, b []byte) []byte {
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return append(b, code.Key...)
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}
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func appendStructEnd(_ *encoder.RuntimeContext, _ *encoder.Opcode, b []byte) []byte {
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return append(b, '}', ',')
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}
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func appendStructEndSkipLast(ctx *encoder.RuntimeContext, code *encoder.Opcode, b []byte) []byte {
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last := len(b) - 1
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if b[last] == ',' {
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b[last] = '}'
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return appendComma(b)
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}
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return appendStructEnd(ctx, code, b)
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}
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func restoreIndent(_ *encoder.RuntimeContext, _ *encoder.Opcode, _ uintptr) {}
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func storeIndent(_ uintptr, _ *encoder.Opcode, _ uintptr) {}
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func appendMapKeyIndent(_ *encoder.RuntimeContext, _ *encoder.Opcode, b []byte) []byte { return b }
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func appendArrayElemIndent(_ *encoder.RuntimeContext, _ *encoder.Opcode, b []byte) []byte { return b }
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