462 lines
14 KiB
Cheetah
462 lines
14 KiB
Cheetah
// +build !notfastpath
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// Copyright (c) 2012-2015 Ugorji Nwoke. All rights reserved.
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// Use of this source code is governed by a MIT license found in the LICENSE file.
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// ************************************************************
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// DO NOT EDIT.
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// THIS FILE IS AUTO-GENERATED from fast-path.go.tmpl
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// ************************************************************
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package codec
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// Fast path functions try to create a fast path encode or decode implementation
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// for common maps and slices.
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//
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// We define the functions and register then in this single file
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// so as not to pollute the encode.go and decode.go, and create a dependency in there.
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// This file can be omitted without causing a build failure.
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//
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// The advantage of fast paths is:
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// - Many calls bypass reflection altogether
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//
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// Currently support
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// - slice of all builtin types,
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// - map of all builtin types to string or interface value
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// - symmetrical maps of all builtin types (e.g. str-str, uint8-uint8)
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// This should provide adequate "typical" implementations.
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//
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// Note that fast track decode functions must handle values for which an address cannot be obtained.
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// For example:
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// m2 := map[string]int{}
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// p2 := []interface{}{m2}
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// // decoding into p2 will bomb if fast track functions do not treat like unaddressable.
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//
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import (
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"reflect"
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"sort"
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)
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const fastpathEnabled = true
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type fastpathT struct {}
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var fastpathTV fastpathT
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type fastpathE struct {
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rtid uintptr
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rt reflect.Type
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encfn func(*Encoder, *codecFnInfo, reflect.Value)
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decfn func(*Decoder, *codecFnInfo, reflect.Value)
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}
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type fastpathA [{{ .FastpathLen }}]fastpathE
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func (x *fastpathA) index(rtid uintptr) int {
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// use binary search to grab the index (adapted from sort/search.go)
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h, i, j := 0, 0, {{ .FastpathLen }} // len(x)
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for i < j {
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h = i + (j-i)/2
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if x[h].rtid < rtid {
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i = h + 1
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} else {
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j = h
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}
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}
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if i < {{ .FastpathLen }} && x[i].rtid == rtid {
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return i
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}
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return -1
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}
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type fastpathAslice []fastpathE
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func (x fastpathAslice) Len() int { return len(x) }
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func (x fastpathAslice) Less(i, j int) bool { return x[i].rtid < x[j].rtid }
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func (x fastpathAslice) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
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var fastpathAV fastpathA
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// due to possible initialization loop error, make fastpath in an init()
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func init() {
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i := 0
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fn := func(v interface{},
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fe func(*Encoder, *codecFnInfo, reflect.Value),
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fd func(*Decoder, *codecFnInfo, reflect.Value)) (f fastpathE) {
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xrt := reflect.TypeOf(v)
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xptr := rt2id(xrt)
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fastpathAV[i] = fastpathE{xptr, xrt, fe, fd}
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i++
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return
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}
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{{range .Values}}{{if not .Primitive}}{{if not .MapKey }}
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fn([]{{ .Elem }}(nil), (*Encoder).{{ .MethodNamePfx "fastpathEnc" false }}R, (*Decoder).{{ .MethodNamePfx "fastpathDec" false }}R){{end}}{{end}}{{end}}
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{{range .Values}}{{if not .Primitive}}{{if .MapKey }}
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fn(map[{{ .MapKey }}]{{ .Elem }}(nil), (*Encoder).{{ .MethodNamePfx "fastpathEnc" false }}R, (*Decoder).{{ .MethodNamePfx "fastpathDec" false }}R){{end}}{{end}}{{end}}
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sort.Sort(fastpathAslice(fastpathAV[:]))
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}
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// -- encode
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// -- -- fast path type switch
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func fastpathEncodeTypeSwitch(iv interface{}, e *Encoder) bool {
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switch v := iv.(type) {
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{{range .Values}}{{if not .Primitive}}{{if not .MapKey }}
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case []{{ .Elem }}:{{else}}
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case map[{{ .MapKey }}]{{ .Elem }}:{{end}}
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(v, e){{if not .MapKey }}
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case *[]{{ .Elem }}:{{else}}
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case *map[{{ .MapKey }}]{{ .Elem }}:{{end}}
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(*v, e)
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{{end}}{{end}}
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default:
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_ = v // TODO: workaround https://github.com/golang/go/issues/12927 (remove after go 1.6 release)
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return false
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}
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return true
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}
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{{/* **** removing this block, as they are never called directly ****
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func fastpathEncodeTypeSwitchSlice(iv interface{}, e *Encoder) bool {
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switch v := iv.(type) {
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{{range .Values}}{{if not .Primitive}}{{if not .MapKey }}
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case []{{ .Elem }}:
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(v, e)
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case *[]{{ .Elem }}:
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(*v, e)
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{{end}}{{end}}{{end}}
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default:
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_ = v // TODO: workaround https://github.com/golang/go/issues/12927 (remove after go 1.6 release)
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return false
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}
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return true
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}
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func fastpathEncodeTypeSwitchMap(iv interface{}, e *Encoder) bool {
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switch v := iv.(type) {
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{{range .Values}}{{if not .Primitive}}{{if .MapKey }}
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case map[{{ .MapKey }}]{{ .Elem }}:
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(v, e)
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case *map[{{ .MapKey }}]{{ .Elem }}:
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(*v, e)
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{{end}}{{end}}{{end}}
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default:
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_ = v // TODO: workaround https://github.com/golang/go/issues/12927 (remove after go 1.6 release)
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return false
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}
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return true
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}
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*/}}
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// -- -- fast path functions
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{{range .Values}}{{if not .Primitive}}{{if not .MapKey }}
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func (e *Encoder) {{ .MethodNamePfx "fastpathEnc" false }}R(f *codecFnInfo, rv reflect.Value) {
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if f.ti.mbs {
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fastpathTV.{{ .MethodNamePfx "EncAsMap" false }}V(rv2i(rv).([]{{ .Elem }}), e)
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} else {
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(rv2i(rv).([]{{ .Elem }}), e)
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}
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}
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func (_ fastpathT) {{ .MethodNamePfx "Enc" false }}V(v []{{ .Elem }}, e *Encoder) {
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if v == nil { e.e.EncodeNil(); return }
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ee, esep := e.e, e.hh.hasElemSeparators()
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ee.WriteArrayStart(len(v))
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for _, v2 := range v {
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if esep { ee.WriteArrayElem() }
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{{ encmd .Elem "v2"}}
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}
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ee.WriteArrayEnd()
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}
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func (_ fastpathT) {{ .MethodNamePfx "EncAsMap" false }}V(v []{{ .Elem }}, e *Encoder) {
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ee, esep := e.e, e.hh.hasElemSeparators()
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if len(v)%2 == 1 {
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e.errorf("mapBySlice requires even slice length, but got %v", len(v))
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return
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}
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ee.WriteMapStart(len(v) / 2)
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for j, v2 := range v {
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if esep {
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if j%2 == 0 {
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ee.WriteMapElemKey()
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} else {
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ee.WriteMapElemValue()
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}
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}
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{{ encmd .Elem "v2"}}
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}
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ee.WriteMapEnd()
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}
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{{end}}{{end}}{{end}}
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{{range .Values}}{{if not .Primitive}}{{if .MapKey }}
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func (e *Encoder) {{ .MethodNamePfx "fastpathEnc" false }}R(f *codecFnInfo, rv reflect.Value) {
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(rv2i(rv).(map[{{ .MapKey }}]{{ .Elem }}), e)
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}
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func (_ fastpathT) {{ .MethodNamePfx "Enc" false }}V(v map[{{ .MapKey }}]{{ .Elem }}, e *Encoder) {
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if v == nil { e.e.EncodeNil(); return }
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ee, esep := e.e, e.hh.hasElemSeparators()
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ee.WriteMapStart(len(v))
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{{if eq .MapKey "string"}}asSymbols := e.h.AsSymbols&AsSymbolMapStringKeysFlag != 0
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{{end}}if e.h.Canonical {
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{{if eq .MapKey "interface{}"}}{{/* out of band
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*/}}var mksv []byte = make([]byte, 0, len(v)*16) // temporary byte slice for the encoding
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e2 := NewEncoderBytes(&mksv, e.hh)
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v2 := make([]bytesI, len(v))
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var i, l int
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var vp *bytesI {{/* put loop variables outside. seems currently needed for better perf */}}
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for k2, _ := range v {
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l = len(mksv)
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e2.MustEncode(k2)
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vp = &v2[i]
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vp.v = mksv[l:]
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vp.i = k2
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i++
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}
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sort.Sort(bytesISlice(v2))
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for j := range v2 {
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if esep { ee.WriteMapElemKey() }
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e.asis(v2[j].v)
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if esep { ee.WriteMapElemValue() }
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e.encode(v[v2[j].i])
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} {{else}}{{ $x := sorttype .MapKey true}}v2 := make([]{{ $x }}, len(v))
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var i int
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for k, _ := range v {
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v2[i] = {{ $x }}(k)
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i++
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}
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sort.Sort({{ sorttype .MapKey false}}(v2))
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for _, k2 := range v2 {
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if esep { ee.WriteMapElemKey() }
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{{if eq .MapKey "string"}}if asSymbols {
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ee.EncodeSymbol(k2)
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} else {
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ee.EncodeString(c_UTF8, k2)
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}{{else}}{{ $y := printf "%s(k2)" .MapKey }}{{ encmd .MapKey $y }}{{end}}
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if esep { ee.WriteMapElemValue() }
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{{ $y := printf "v[%s(k2)]" .MapKey }}{{ encmd .Elem $y }}
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} {{end}}
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} else {
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for k2, v2 := range v {
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if esep { ee.WriteMapElemKey() }
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{{if eq .MapKey "string"}}if asSymbols {
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ee.EncodeSymbol(k2)
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} else {
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ee.EncodeString(c_UTF8, k2)
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}{{else}}{{ encmd .MapKey "k2"}}{{end}}
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if esep { ee.WriteMapElemValue() }
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{{ encmd .Elem "v2"}}
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}
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}
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ee.WriteMapEnd()
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}
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{{end}}{{end}}{{end}}
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// -- decode
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// -- -- fast path type switch
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func fastpathDecodeTypeSwitch(iv interface{}, d *Decoder) bool {
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switch v := iv.(type) {
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{{range .Values}}{{if not .Primitive}}{{if not .MapKey }}
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case []{{ .Elem }}:{{else}}
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case map[{{ .MapKey }}]{{ .Elem }}:{{end}}
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fastpathTV.{{ .MethodNamePfx "Dec" false }}V(v, false, d){{if not .MapKey }}
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case *[]{{ .Elem }}: {{else}}
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case *map[{{ .MapKey }}]{{ .Elem }}: {{end}}
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if v2, changed2 := fastpathTV.{{ .MethodNamePfx "Dec" false }}V(*v, true, d); changed2 {
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*v = v2
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}
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{{end}}{{end}}
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default:
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_ = v // TODO: workaround https://github.com/golang/go/issues/12927 (remove after go 1.6 release)
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return false
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}
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return true
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}
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func fastpathDecodeSetZeroTypeSwitch(iv interface{}) bool {
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switch v := iv.(type) {
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{{range .Values}}{{if not .Primitive}}{{if not .MapKey }}
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case *[]{{ .Elem }}: {{else}}
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case *map[{{ .MapKey }}]{{ .Elem }}: {{end}}
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*v = nil
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{{end}}{{end}}
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default:
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_ = v // TODO: workaround https://github.com/golang/go/issues/12927 (remove after go 1.6 release)
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return false
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}
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return true
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}
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// -- -- fast path functions
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{{range .Values}}{{if not .Primitive}}{{if not .MapKey }}
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{{/*
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Slices can change if they
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- did not come from an array
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- are addressable (from a ptr)
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- are settable (e.g. contained in an interface{})
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*/}}
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func (d *Decoder) {{ .MethodNamePfx "fastpathDec" false }}R(f *codecFnInfo, rv reflect.Value) {
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if array := f.seq == seqTypeArray; !array && rv.Kind() == reflect.Ptr {
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var vp = rv2i(rv).(*[]{{ .Elem }})
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if v, changed := fastpathTV.{{ .MethodNamePfx "Dec" false }}V(*vp, !array, d); changed {
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*vp = v
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}
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} else {
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fastpathTV.{{ .MethodNamePfx "Dec" false }}V(rv2i(rv).([]{{ .Elem }}), !array, d)
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}
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}
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func (f fastpathT) {{ .MethodNamePfx "Dec" false }}X(vp *[]{{ .Elem }}, d *Decoder) {
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if v, changed := f.{{ .MethodNamePfx "Dec" false }}V(*vp, true, d); changed {
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*vp = v
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}
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}
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func (_ fastpathT) {{ .MethodNamePfx "Dec" false }}V(v []{{ .Elem }}, canChange bool, d *Decoder) (_ []{{ .Elem }}, changed bool) {
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dd := d.d
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{{/* // if dd.isContainerType(valueTypeNil) { dd.TryDecodeAsNil() */}}
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slh, containerLenS := d.decSliceHelperStart()
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if containerLenS == 0 {
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if canChange {
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if v == nil {
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v = []{{ .Elem }}{}
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} else if len(v) != 0 {
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v = v[:0]
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}
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changed = true
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}
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slh.End()
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return v, changed
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}
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hasLen := containerLenS > 0
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var xlen int
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if hasLen && canChange {
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if containerLenS > cap(v) {
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xlen = decInferLen(containerLenS, d.h.MaxInitLen, {{ .Size }})
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if xlen <= cap(v) {
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v = v[:xlen]
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} else {
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v = make([]{{ .Elem }}, xlen)
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}
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changed = true
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} else if containerLenS != len(v) {
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v = v[:containerLenS]
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changed = true
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}
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}
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j := 0
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for ; (hasLen && j < containerLenS) || !(hasLen || dd.CheckBreak()); j++ {
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if j == 0 && len(v) == 0 {
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if hasLen {
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xlen = decInferLen(containerLenS, d.h.MaxInitLen, {{ .Size }})
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} else {
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xlen = 8
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}
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v = make([]{{ .Elem }}, xlen)
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changed = true
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}
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// if indefinite, etc, then expand the slice if necessary
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var decodeIntoBlank bool
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if j >= len(v) {
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if canChange {
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v = append(v, {{ zerocmd .Elem }})
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changed = true
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} else {
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d.arrayCannotExpand(len(v), j+1)
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decodeIntoBlank = true
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}
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}
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slh.ElemContainerState(j)
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if decodeIntoBlank {
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d.swallow()
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} else {
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{{ if eq .Elem "interface{}" }}d.decode(&v[j]){{ else }}v[j] = {{ decmd .Elem }}{{ end }}
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}
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}
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if canChange {
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if j < len(v) {
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v = v[:j]
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changed = true
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} else if j == 0 && v == nil {
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v = make([]{{ .Elem }}, 0)
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changed = true
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}
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}
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slh.End()
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return v, changed
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}
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{{end}}{{end}}{{end}}
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{{range .Values}}{{if not .Primitive}}{{if .MapKey }}
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{{/*
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Maps can change if they are
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- addressable (from a ptr)
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- settable (e.g. contained in an interface{})
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*/}}
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func (d *Decoder) {{ .MethodNamePfx "fastpathDec" false }}R(f *codecFnInfo, rv reflect.Value) {
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if rv.Kind() == reflect.Ptr {
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vp := rv2i(rv).(*map[{{ .MapKey }}]{{ .Elem }})
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if v, changed := fastpathTV.{{ .MethodNamePfx "Dec" false }}V(*vp, true, d); changed {
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*vp = v
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}
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return
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}
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fastpathTV.{{ .MethodNamePfx "Dec" false }}V(rv2i(rv).(map[{{ .MapKey }}]{{ .Elem }}), false, d)
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}
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func (f fastpathT) {{ .MethodNamePfx "Dec" false }}X(vp *map[{{ .MapKey }}]{{ .Elem }}, d *Decoder) {
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if v, changed := f.{{ .MethodNamePfx "Dec" false }}V(*vp, true, d); changed {
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*vp = v
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}
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}
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func (_ fastpathT) {{ .MethodNamePfx "Dec" false }}V(v map[{{ .MapKey }}]{{ .Elem }}, canChange bool,
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d *Decoder) (_ map[{{ .MapKey }}]{{ .Elem }}, changed bool) {
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dd, esep := d.d, d.hh.hasElemSeparators()
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{{/* // if dd.isContainerType(valueTypeNil) {dd.TryDecodeAsNil() */}}
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containerLen := dd.ReadMapStart()
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if canChange && v == nil {
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xlen := decInferLen(containerLen, d.h.MaxInitLen, {{ .Size }})
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v = make(map[{{ .MapKey }}]{{ .Elem }}, xlen)
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changed = true
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}
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if containerLen == 0 {
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dd.ReadMapEnd()
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return v, changed
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}
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{{ if eq .Elem "interface{}" }}mapGet := !d.h.MapValueReset && !d.h.InterfaceReset{{end}}
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var mk {{ .MapKey }}
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var mv {{ .Elem }}
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hasLen := containerLen > 0
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for j := 0; (hasLen && j < containerLen) || !(hasLen || dd.CheckBreak()); j++ {
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if esep { dd.ReadMapElemKey() }
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{{ if eq .MapKey "interface{}" }}mk = nil
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d.decode(&mk)
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if bv, bok := mk.([]byte); bok {
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mk = d.string(bv) {{/* // maps cannot have []byte as key. switch to string. */}}
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}{{ else }}mk = {{ decmd .MapKey }}{{ end }}
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if esep { dd.ReadMapElemValue() }
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if dd.TryDecodeAsNil() {
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if d.h.DeleteOnNilMapValue { delete(v, mk) } else { v[mk] = {{ zerocmd .Elem }} }
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continue
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}
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{{ if eq .Elem "interface{}" }}if mapGet { mv = v[mk] } else { mv = nil }
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d.decode(&mv){{ else }}mv = {{ decmd .Elem }}{{ end }}
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if v != nil {
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v[mk] = mv
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}
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}
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dd.ReadMapEnd()
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return v, changed
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}
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{{end}}{{end}}{{end}}
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