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// 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
}
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