gtsocial-umbx

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pools.go (3523B)

      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 decoder
     18 
     19 import (
     20     `sync`
     21     `unsafe`
     22 
     23     `github.com/bytedance/sonic/internal/caching`
     24     `github.com/bytedance/sonic/internal/native/types`
     25     `github.com/bytedance/sonic/internal/rt`
     26 )
     27 
     28 const (
     29     _MinSlice = 2
     30     _MaxStack = 4096 // 4k slots
     31     _MaxStackBytes = _MaxStack * _PtrBytes
     32     _MaxDigitNums = 800  // used in atof fallback algorithm
     33 )
     34 
     35 const (
     36     _PtrBytes   = _PTR_SIZE / 8
     37     _FsmOffset  = (_MaxStack + 1) * _PtrBytes
     38     _DbufOffset = _FsmOffset + int64(unsafe.Sizeof(types.StateMachine{})) + types.MAX_RECURSE * _PtrBytes
     39     _StackSize  = unsafe.Sizeof(_Stack{})
     40 )
     41 
     42 var (
     43     stackPool     = sync.Pool{}
     44     valueCache    = []unsafe.Pointer(nil)
     45     fieldCache    = []*caching.FieldMap(nil)
     46     fieldCacheMux = sync.Mutex{}
     47     programCache  = caching.CreateProgramCache()
     48 )
     49 
     50 type _Stack struct {
     51     sp uintptr
     52     sb [_MaxStack]unsafe.Pointer
     53     mm types.StateMachine
     54     vp [types.MAX_RECURSE]unsafe.Pointer
     55     dp [_MaxDigitNums]byte
     56 }
     57 
     58 type _Decoder func(
     59     s  string,
     60     i  int,
     61     vp unsafe.Pointer,
     62     sb *_Stack,
     63     fv uint64,
     64     sv string, // DO NOT pass value to this arguement, since it is only used for local _VAR_sv
     65     vk unsafe.Pointer, // DO NOT pass value to this arguement, since it is only used for local _VAR_vk
     66 ) (int, error)
     67 
     68 var _KeepAlive struct {
     69     s string
     70     i int
     71     vp unsafe.Pointer
     72     sb *_Stack
     73     fv uint64
     74     sv string
     75     vk unsafe.Pointer
     76 
     77     ret int
     78     err error
     79 
     80     frame_decoder [_FP_offs]byte
     81     frame_generic [_VD_offs]byte
     82 }
     83 
     84 var (
     85     argPtrs   = []bool{true, false, false, true, true, false, true, false, true}
     86     localPtrs = []bool{}
     87 )
     88 
     89 var (
     90     argPtrs_generic   = []bool{true}
     91     localPtrs_generic = []bool{}
     92 )
     93 
     94 func newStack() *_Stack {
     95     if ret := stackPool.Get(); ret == nil {
     96         return new(_Stack)
     97     } else {
     98         return ret.(*_Stack)
     99     }
    100 }
    101 
    102 func resetStack(p *_Stack) {
    103     memclrNoHeapPointers(unsafe.Pointer(p), _StackSize)
    104 }
    105 
    106 func freeStack(p *_Stack) {
    107     p.sp = 0
    108     stackPool.Put(p)
    109 }
    110 
    111 func freezeValue(v unsafe.Pointer) uintptr {
    112     valueCache = append(valueCache, v)
    113     return uintptr(v)
    114 }
    115 
    116 func freezeFields(v *caching.FieldMap) int64 {
    117     fieldCacheMux.Lock()
    118     fieldCache = append(fieldCache, v)
    119     fieldCacheMux.Unlock()
    120     return referenceFields(v)
    121 }
    122 
    123 func referenceFields(v *caching.FieldMap) int64 {
    124     return int64(uintptr(unsafe.Pointer(v)))
    125 }
    126 
    127 func makeDecoder(vt *rt.GoType, _ ...interface{}) (interface{}, error) {
    128     if pp, err := newCompiler().compile(vt.Pack()); err != nil {
    129         return nil, err
    130     } else {
    131         return newAssembler(pp).Load(), nil
    132     }
    133 }
    134 
    135 func findOrCompile(vt *rt.GoType) (_Decoder, error) {
    136     if val := programCache.Get(vt); val != nil {
    137         return val.(_Decoder), nil
    138     } else if ret, err := programCache.Compute(vt, makeDecoder); err == nil {
    139         return ret.(_Decoder), nil
    140     } else {
    141         return nil, err
    142     }
    143 }