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 )
22 23 24 // NoEscape hides a pointer from escape analysis. NoEscape is
25 // the identity function but escape analysis doesn't think the
26 // output depends on the input. NoEscape is inlined and currently
27 // compiles down to zero instructions.
28 // USE CAREFULLY!
29 //go:nosplit
30 //goland:noinspection GoVetUnsafePointer
31 func NoEscape(p unsafe.Pointer) unsafe.Pointer {
32 x := uintptr(p)
33 return unsafe.Pointer(x ^ 0)
34 }
35 36 //go:nosplit
37 func MoreStack(size uintptr)
38 39 //go:nosplit
40 func Add(ptr unsafe.Pointer, off uintptr) unsafe.Pointer {
41 return unsafe.Pointer(uintptr(ptr) + off)
42 }
43