/
go_type.go
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/
go_type.go
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// MIT License
//
// Copyright (c) 2021 Xiantu Li
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package json
import (
"reflect"
"unsafe"
)
type SliceHeader struct {
Data unsafe.Pointer
Len int
Cap int
}
type StringHeader struct {
Data unsafe.Pointer
Len int
}
type Value struct {
typ *GoType
ptr unsafe.Pointer
flag uintptr
}
func reflectValueToPointer(v *reflect.Value) unsafe.Pointer {
return (*Value)(unsafe.Pointer(v)).ptr
}
func reflectValueToValue(v *reflect.Value) *Value {
return (*Value)(unsafe.Pointer(v))
}
func bytesString(b []byte) string {
return *(*string)(unsafe.Pointer(&b))
}
func stringBytes(str string) []byte {
return (*(*[]byte)(unsafe.Pointer(&str)))[:len(str):len(str)]
}
func bytesCopyToString(b []byte, str *string) {
*str = *(*string)(unsafe.Pointer(&b))
}
// emptyInterface is the header for an interface{} value.
type emptyInterface struct {
typ uintptr
word unsafe.Pointer
}
type nonEmptyInterface struct {
itab *struct {
ityp *GoType // static interface type
typ *GoType // dynamic concrete type
hash uint32 // copy of typ.hash
_ [4]byte
fun [100000]unsafe.Pointer // method table
}
word *GoType
}
func UnpackNonEface(p unsafe.Pointer) *GoType {
neface := (*nonEmptyInterface)(p)
return neface.word
}
func UnpackType(t reflect.Type) *GoType {
return (*GoType)((*GoIface)(unsafe.Pointer(&t)).Value)
}
func unpackEface(v interface{}) *emptyInterface {
empty := (*emptyInterface)(unsafe.Pointer(&v))
return empty
}
func UnpackEface(v interface{}) GoEface {
return *(*GoEface)(unsafe.Pointer(&v))
}
type GoEface struct {
Type *GoType
Value unsafe.Pointer
}
type GoIface struct {
Itab *GoItab
Value unsafe.Pointer
}
type GoItab struct {
it unsafe.Pointer
vt *GoType
hv uint32
_ [4]byte
fn [1]uintptr
}
type GoType struct {
Size uintptr
PtrData uintptr
Hash uint32
Flags uint8
Align uint8
FieldAlign uint8
KindFlags uint8
Traits unsafe.Pointer
GCData *byte
Str int32
PtrToSelf int32
}
type interfacetype struct {
typ GoType
// /src/runtime/type.go: interfacetype
}
func PtrElem(t *GoType) *GoType {
return (*GoPtrType)(unsafe.Pointer(t)).Elem
}
type GoPtrType struct {
GoType
Elem *GoType
}