144 lines
3.5 KiB
Go
144 lines
3.5 KiB
Go
/*
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* Copyright 2021 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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*/
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package decoder
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import (
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`sync`
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`unsafe`
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`github.com/bytedance/sonic/internal/caching`
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`github.com/bytedance/sonic/internal/native/types`
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`github.com/bytedance/sonic/internal/rt`
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)
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const (
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_MinSlice = 2
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_MaxStack = 4096 // 4k slots
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_MaxStackBytes = _MaxStack * _PtrBytes
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_MaxDigitNums = types.MaxDigitNums // used in atof fallback algorithm
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)
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const (
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_PtrBytes = _PTR_SIZE / 8
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_FsmOffset = (_MaxStack + 1) * _PtrBytes
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_DbufOffset = _FsmOffset + int64(unsafe.Sizeof(types.StateMachine{})) + types.MAX_RECURSE * _PtrBytes
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_StackSize = unsafe.Sizeof(_Stack{})
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)
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var (
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stackPool = sync.Pool{}
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valueCache = []unsafe.Pointer(nil)
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fieldCache = []*caching.FieldMap(nil)
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fieldCacheMux = sync.Mutex{}
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programCache = caching.CreateProgramCache()
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)
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type _Stack struct {
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sp uintptr
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sb [_MaxStack]unsafe.Pointer
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mm types.StateMachine
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vp [types.MAX_RECURSE]unsafe.Pointer
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dp [_MaxDigitNums]byte
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}
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type _Decoder func(
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s string,
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i int,
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vp unsafe.Pointer,
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sb *_Stack,
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fv uint64,
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sv string, // DO NOT pass value to this arguement, since it is only used for local _VAR_sv
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vk unsafe.Pointer, // DO NOT pass value to this arguement, since it is only used for local _VAR_vk
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) (int, error)
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var _KeepAlive struct {
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s string
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i int
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vp unsafe.Pointer
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sb *_Stack
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fv uint64
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sv string
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vk unsafe.Pointer
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ret int
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err error
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frame_decoder [_FP_offs]byte
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frame_generic [_VD_offs]byte
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}
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var (
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argPtrs = []bool{true, false, false, true, true, false, true, false, true}
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localPtrs = []bool{}
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)
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var (
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argPtrs_generic = []bool{true}
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localPtrs_generic = []bool{}
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)
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func newStack() *_Stack {
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if ret := stackPool.Get(); ret == nil {
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return new(_Stack)
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} else {
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return ret.(*_Stack)
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}
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}
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func resetStack(p *_Stack) {
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memclrNoHeapPointers(unsafe.Pointer(p), _StackSize)
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}
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func freeStack(p *_Stack) {
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p.sp = 0
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stackPool.Put(p)
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}
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func freezeValue(v unsafe.Pointer) uintptr {
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valueCache = append(valueCache, v)
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return uintptr(v)
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}
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func freezeFields(v *caching.FieldMap) int64 {
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fieldCacheMux.Lock()
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fieldCache = append(fieldCache, v)
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fieldCacheMux.Unlock()
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return referenceFields(v)
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}
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func referenceFields(v *caching.FieldMap) int64 {
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return int64(uintptr(unsafe.Pointer(v)))
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}
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func makeDecoder(vt *rt.GoType, _ ...interface{}) (interface{}, error) {
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if pp, err := newCompiler().compile(vt.Pack()); err != nil {
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return nil, err
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} else {
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return newAssembler(pp).Load(), nil
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}
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}
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func findOrCompile(vt *rt.GoType) (_Decoder, error) {
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if val := programCache.Get(vt); val != nil {
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return val.(_Decoder), nil
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} else if ret, err := programCache.Compute(vt, makeDecoder); err == nil {
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return ret.(_Decoder), nil
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} else {
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return nil, err
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}
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}
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