125 lines
3.2 KiB
Go
125 lines
3.2 KiB
Go
/*
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* Copyright 2021 ByteDance Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package rt
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import (
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`unsafe`
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`reflect`
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)
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//go:nosplit
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func Get16(v []byte) int16 {
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return *(*int16)((*GoSlice)(unsafe.Pointer(&v)).Ptr)
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}
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//go:nosplit
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func Get32(v []byte) int32 {
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return *(*int32)((*GoSlice)(unsafe.Pointer(&v)).Ptr)
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}
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//go:nosplit
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func Get64(v []byte) int64 {
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return *(*int64)((*GoSlice)(unsafe.Pointer(&v)).Ptr)
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}
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//go:nosplit
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func Mem2Str(v []byte) (s string) {
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(*GoString)(unsafe.Pointer(&s)).Len = (*GoSlice)(unsafe.Pointer(&v)).Len
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(*GoString)(unsafe.Pointer(&s)).Ptr = (*GoSlice)(unsafe.Pointer(&v)).Ptr
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return
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}
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//go:nosplit
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func Str2Mem(s string) (v []byte) {
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(*GoSlice)(unsafe.Pointer(&v)).Cap = (*GoString)(unsafe.Pointer(&s)).Len
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(*GoSlice)(unsafe.Pointer(&v)).Len = (*GoString)(unsafe.Pointer(&s)).Len
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(*GoSlice)(unsafe.Pointer(&v)).Ptr = (*GoString)(unsafe.Pointer(&s)).Ptr
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return
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}
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func BytesFrom(p unsafe.Pointer, n int, c int) (r []byte) {
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(*GoSlice)(unsafe.Pointer(&r)).Ptr = p
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(*GoSlice)(unsafe.Pointer(&r)).Len = n
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(*GoSlice)(unsafe.Pointer(&r)).Cap = c
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return
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}
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func FuncAddr(f interface{}) unsafe.Pointer {
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if vv := UnpackEface(f); vv.Type.Kind() != reflect.Func {
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panic("f is not a function")
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} else {
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return *(*unsafe.Pointer)(vv.Value)
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}
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}
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//go:nocheckptr
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func IndexChar(src string, index int) unsafe.Pointer {
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return unsafe.Pointer(uintptr((*GoString)(unsafe.Pointer(&src)).Ptr) + uintptr(index))
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}
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//go:nocheckptr
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func IndexByte(ptr []byte, index int) unsafe.Pointer {
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return unsafe.Pointer(uintptr((*GoSlice)(unsafe.Pointer(&ptr)).Ptr) + uintptr(index))
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}
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func GuardSlice(buf *[]byte, n int) {
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c := cap(*buf)
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l := len(*buf)
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if c-l < n {
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c = c>>1 + n + l
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if c < 32 {
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c = 32
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}
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tmp := make([]byte, l, c)
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copy(tmp, *buf)
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*buf = tmp
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}
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}
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//go:nosplit
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func Ptr2SlicePtr(s unsafe.Pointer, l int, c int) unsafe.Pointer {
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slice := &GoSlice{
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Ptr: s,
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Len: l,
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Cap: c,
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}
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return unsafe.Pointer(slice)
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}
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//go:nosplit
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func StrPtr(s string) unsafe.Pointer {
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return (*GoString)(unsafe.Pointer(&s)).Ptr
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}
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//go:nosplit
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func StrFrom(p unsafe.Pointer, n int64) (s string) {
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(*GoString)(unsafe.Pointer(&s)).Ptr = p
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(*GoString)(unsafe.Pointer(&s)).Len = int(n)
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return
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}
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// NoEscape hides a pointer from escape analysis. NoEscape is
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// the identity function but escape analysis doesn't think the
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// output depends on the input. NoEscape is inlined and currently
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// compiles down to zero instructions.
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// USE CAREFULLY!
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//go:nosplit
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//goland:noinspection GoVetUnsafePointer
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func NoEscape(p unsafe.Pointer) unsafe.Pointer {
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x := uintptr(p)
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return unsafe.Pointer(x ^ 0)
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} |