diff options
Diffstat (limited to 'vendor/github.com/bytedance/gopkg/lang/dirtmake/bytes.go')
| -rw-r--r-- | vendor/github.com/bytedance/gopkg/lang/dirtmake/bytes.go | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/vendor/github.com/bytedance/gopkg/lang/dirtmake/bytes.go b/vendor/github.com/bytedance/gopkg/lang/dirtmake/bytes.go new file mode 100644 index 000000000..1daa27904 --- /dev/null +++ b/vendor/github.com/bytedance/gopkg/lang/dirtmake/bytes.go @@ -0,0 +1,43 @@ +// Copyright 2024 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 dirtmake + +import ( + "unsafe" +) + +type slice struct { + data unsafe.Pointer + len int + cap int +} + +//go:linkname mallocgc runtime.mallocgc +func mallocgc(size uintptr, typ unsafe.Pointer, needzero bool) unsafe.Pointer + +// Bytes allocates a byte slice but does not clean up the memory it references. +// Throw a fatal error instead of panic if cap is greater than runtime.maxAlloc. +// NOTE: MUST set any byte element before it's read. +func Bytes(len, cap int) (b []byte) { + if len < 0 || len > cap { + panic("dirtmake.Bytes: len out of range") + } + p := mallocgc(uintptr(cap), nil, false) + sh := (*slice)(unsafe.Pointer(&b)) + sh.data = p + sh.len = len + sh.cap = cap + return +} |
