44 lines
1.2 KiB
Go
44 lines
1.2 KiB
Go
// Copyright 2024 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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package dirtmake
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import (
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"unsafe"
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)
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type slice struct {
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data unsafe.Pointer
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len int
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cap int
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}
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//go:linkname mallocgc runtime.mallocgc
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func mallocgc(size uintptr, typ unsafe.Pointer, needzero bool) unsafe.Pointer
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// Bytes allocates a byte slice but does not clean up the memory it references.
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// Throw a fatal error instead of panic if cap is greater than runtime.maxAlloc.
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// NOTE: MUST set any byte element before it's read.
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func Bytes(len, cap int) (b []byte) {
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if len < 0 || len > cap {
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panic("dirtmake.Bytes: len out of range")
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}
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p := mallocgc(uintptr(cap), nil, false)
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sh := (*slice)(unsafe.Pointer(&b))
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sh.data = p
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sh.len = len
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sh.cap = cap
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return
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}
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