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/*
* Copyright 2021 ByteDance Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package rt
import (
"reflect"
"unsafe"
)
var (
reflectRtypeItab = findReflectRtypeItab()
)
// GoType.KindFlags const
const (
F_direct = 1 << 5
F_kind_mask = (1 << 5) - 1
)
// GoType.Flags const
const (
tflagUncommon uint8 = 1 << 0
tflagExtraStar uint8 = 1 << 1
tflagNamed uint8 = 1 << 2
tflagRegularMemory uint8 = 1 << 3
)
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
}
func (self *GoType) IsNamed() bool {
return (self.Flags & tflagNamed) != 0
}
func (self *GoType) Kind() reflect.Kind {
return reflect.Kind(self.KindFlags & F_kind_mask)
}
func (self *GoType) Pack() (t reflect.Type) {
(*GoIface)(unsafe.Pointer(&t)).Itab = reflectRtypeItab
(*GoIface)(unsafe.Pointer(&t)).Value = unsafe.Pointer(self)
return
}
func (self *GoType) String() string {
return self.Pack().String()
}
func (self *GoType) Indirect() bool {
return self.KindFlags&F_direct == 0
}
type GoMap struct {
Count int
Flags uint8
B uint8
Overflow uint16
Hash0 uint32
Buckets unsafe.Pointer
OldBuckets unsafe.Pointer
Evacuate uintptr
Extra unsafe.Pointer
}
type GoMapIterator struct {
K unsafe.Pointer
V unsafe.Pointer
T *GoMapType
H *GoMap
Buckets unsafe.Pointer
Bptr *unsafe.Pointer
Overflow *[]unsafe.Pointer
OldOverflow *[]unsafe.Pointer
StartBucket uintptr
Offset uint8
Wrapped bool
B uint8
I uint8
Bucket uintptr
CheckBucket uintptr
}
type GoItab struct {
it unsafe.Pointer
Vt *GoType
hv uint32
_ [4]byte
fn [1]uintptr
}
type GoIface struct {
Itab *GoItab
Value unsafe.Pointer
}
type GoEface struct {
Type *GoType
Value unsafe.Pointer
}
func (self GoEface) Pack() (v interface{}) {
*(*GoEface)(unsafe.Pointer(&v)) = self
return
}
type GoPtrType struct {
GoType
Elem *GoType
}
type GoMapType struct {
GoType
Key *GoType
Elem *GoType
Bucket *GoType
Hasher func(unsafe.Pointer, uintptr) uintptr
KeySize uint8
ElemSize uint8
BucketSize uint16
Flags uint32
}
func (self *GoMapType) IndirectElem() bool {
return self.Flags&2 != 0
}
type GoStructType struct {
GoType
Pkg *byte
Fields []GoStructField
}
type GoStructField struct {
Name *byte
Type *GoType
OffEmbed uintptr
}
type GoInterfaceType struct {
GoType
PkgPath *byte
Methods []GoInterfaceMethod
}
type GoInterfaceMethod struct {
Name int32
Type int32
}
type GoSlice struct {
Ptr unsafe.Pointer
Len int
Cap int
}
type GoString struct {
Ptr unsafe.Pointer
Len int
}
func PtrElem(t *GoType) *GoType {
return (*GoPtrType)(unsafe.Pointer(t)).Elem
}
func MapType(t *GoType) *GoMapType {
return (*GoMapType)(unsafe.Pointer(t))
}
func IfaceType(t *GoType) *GoInterfaceType {
return (*GoInterfaceType)(unsafe.Pointer(t))
}
func UnpackType(t reflect.Type) *GoType {
return (*GoType)((*GoIface)(unsafe.Pointer(&t)).Value)
}
func UnpackEface(v interface{}) GoEface {
return *(*GoEface)(unsafe.Pointer(&v))
}
func UnpackIface(v interface{}) GoIface {
return *(*GoIface)(unsafe.Pointer(&v))
}
func findReflectRtypeItab() *GoItab {
v := reflect.TypeOf(struct{}{})
return (*GoIface)(unsafe.Pointer(&v)).Itab
}
func AssertI2I2(t *GoType, i GoIface) (r GoIface) {
inter := IfaceType(t)
tab := i.Itab
if tab == nil {
return
}
if (*GoInterfaceType)(tab.it) != inter {
tab = GetItab(inter, tab.Vt, true)
if tab == nil {
return
}
}
r.Itab = tab
r.Value = i.Value
return
}
func (t *GoType) IsInt64() bool {
return t.Kind() == reflect.Int64 || (t.Kind() == reflect.Int && t.Size == 8)
}
func (t *GoType) IsInt32() bool {
return t.Kind() == reflect.Int32 || (t.Kind() == reflect.Int && t.Size == 4)
}
//go:nosplit
func (t *GoType) IsUint64() bool {
isUint := t.Kind() == reflect.Uint || t.Kind() == reflect.Uintptr
return t.Kind() == reflect.Uint64 || (isUint && t.Size == 8)
}
//go:nosplit
func (t *GoType) IsUint32() bool {
isUint := t.Kind() == reflect.Uint || t.Kind() == reflect.Uintptr
return t.Kind() == reflect.Uint32 || (isUint && t.Size == 4)
}
//go:nosplit
func PtrAdd(ptr unsafe.Pointer, offset uintptr) unsafe.Pointer {
return unsafe.Pointer(uintptr(ptr) + offset)
}
//go:noescape
//go:linkname GetItab runtime.getitab
func GetItab(inter *GoInterfaceType, typ *GoType, canfail bool) *GoItab
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