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| 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 | +} |
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