1 /*
2 * Copyright 2021 ByteDance Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 17 package rt
18 19 import (
20 `unsafe`
21 `reflect`
22 )
23 24 //go:nosplit
25 func Mem2Str(v []byte) (s string) {
26 (*GoString)(unsafe.Pointer(&s)).Len = (*GoSlice)(unsafe.Pointer(&v)).Len
27 (*GoString)(unsafe.Pointer(&s)).Ptr = (*GoSlice)(unsafe.Pointer(&v)).Ptr
28 return
29 }
30 31 //go:nosplit
32 func Str2Mem(s string) (v []byte) {
33 (*GoSlice)(unsafe.Pointer(&v)).Cap = (*GoString)(unsafe.Pointer(&s)).Len
34 (*GoSlice)(unsafe.Pointer(&v)).Len = (*GoString)(unsafe.Pointer(&s)).Len
35 (*GoSlice)(unsafe.Pointer(&v)).Ptr = (*GoString)(unsafe.Pointer(&s)).Ptr
36 return
37 }
38 39 func BytesFrom(p unsafe.Pointer, n int, c int) (r []byte) {
40 (*GoSlice)(unsafe.Pointer(&r)).Ptr = p
41 (*GoSlice)(unsafe.Pointer(&r)).Len = n
42 (*GoSlice)(unsafe.Pointer(&r)).Cap = c
43 return
44 }
45 46 func FuncAddr(f interface{}) unsafe.Pointer {
47 if vv := UnpackEface(f); vv.Type.Kind() != reflect.Func {
48 panic("f is not a function")
49 } else {
50 return *(*unsafe.Pointer)(vv.Value)
51 }
52 }
53 54 //go:nocheckptr
55 func IndexChar(src string, index int) unsafe.Pointer {
56 return unsafe.Pointer(uintptr((*GoString)(unsafe.Pointer(&src)).Ptr) + uintptr(index))
57 }
58 59 //go:nocheckptr
60 func IndexByte(ptr []byte, index int) unsafe.Pointer {
61 return unsafe.Pointer(uintptr((*GoSlice)(unsafe.Pointer(&ptr)).Ptr) + uintptr(index))
62 }
63