github.com/bytedance/sonic@v1.11.7-0.20240517092252-d2edb31b167b/internal/caching/hashing.go (about)

     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 caching
    18  
    19  import (
    20      `unsafe`
    21  
    22      `github.com/bytedance/sonic/internal/rt`
    23  )
    24  
    25  var (
    26      V_strhash = rt.UnpackEface(strhash)
    27      S_strhash = *(*uintptr)(V_strhash.Value)
    28  )
    29  
    30  //go:noescape
    31  //go:linkname strhash runtime.strhash
    32  func strhash(_ unsafe.Pointer, _ uintptr) uintptr
    33  
    34  func StrHash(s string) uint64 {
    35      if v := strhash(unsafe.Pointer(&s), 0); v == 0 {
    36          return 1
    37      } else {
    38          return uint64(v)
    39      }
    40  }