504 lines
15 KiB
Cheetah
504 lines
15 KiB
Cheetah
// +build !notfastpath
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// Copyright (c) 2012-2018 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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// Code generated from fast-path.go.tmpl - DO NOT EDIT.
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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 them 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 (numeric, bool, string, []byte)
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// - maps of builtin types to builtin or interface{} type, EXCEPT FOR
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// keys of type uintptr, int8/16/32, uint16/32, float32/64, bool, interface{}
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// AND values of type type int8/16/32, uint16/32
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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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{{/*
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fastpathEncMapStringUint64R (called by fastpath...switch)
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EncMapStringUint64V (called by codecgen)
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fastpathEncSliceBoolR: (called by fastpath...switch) (checks f.ti.mbs and calls one of them below)
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EncSliceBoolV (also called by codecgen)
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EncAsMapSliceBoolV (delegate when mapbyslice=true)
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fastpathDecSliceIntfR (called by fastpath...switch) (calls Y or N below depending on if it can be updated)
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DecSliceIntfX (called by codecgen) (calls Y below)
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DecSliceIntfY (delegate when slice CAN be updated)
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DecSliceIntfN (delegate when slice CANNOT be updated e.g. from array or non-addressable slice)
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fastpathDecMap...R (called by fastpath...switch) (calls L or X? below)
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DecMap...X (called by codecgen)
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DecMap...L (delegated to by both above)
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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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const fastpathMapBySliceErrMsg = "mapBySlice requires even slice length, but got %v"
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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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// Note: we use goto (instead of for loop) so this can be inlined.
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// h, i, j := 0, 0, len(x)
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var h, i uint
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var j = uint(len(x))
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LOOP:
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if 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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goto LOOP
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}
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if i < uint(len(x)) && x[i].rtid == rtid {
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return int(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[uint(i)].rtid < x[uint(j)].rtid }
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func (x fastpathAslice) Swap(i, j int) { x[uint(i)], x[uint(j)] = x[uint(j)], x[uint(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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var i uint = 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)) {
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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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}
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{{/* do not register []uint8 in fast-path */}}
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{{range .Values}}{{if not .Primitive}}{{if not .MapKey }}{{if ne .Elem "uint8" -}}
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fn([]{{ .Elem }}(nil), (*Encoder).{{ .MethodNamePfx "fastpathEnc" false }}R, (*Decoder).{{ .MethodNamePfx "fastpathDec" false }}R)
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{{end}}{{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)
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{{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 }}{{if ne .Elem "uint8" -}}
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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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if *v == nil {
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e.e.EncodeNil()
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} else {
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(*v, e)
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}
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{{end}}{{end}}{{end}}{{end -}}
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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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if *v == nil {
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e.e.EncodeNil()
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} else {
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(*v, e)
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}
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{{end}}{{end}}{{end -}}
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default:
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_ = v // workaround https://github.com/golang/go/issues/12927 seen in go1.4
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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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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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e.arrayStart(len(v))
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for j := range v {
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e.arrayElem()
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{{ encmd .Elem "v[j]"}}
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}
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e.arrayEnd()
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}
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func (fastpathT) {{ .MethodNamePfx "EncAsMap" false }}V(v []{{ .Elem }}, e *Encoder) {
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{{/* if v == nil { e.e.EncodeNil() } else */ -}}
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if len(v)%2 == 1 {
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e.errorf(fastpathMapBySliceErrMsg, len(v))
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} else {
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e.mapStart(len(v) / 2)
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for j := range v {
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if j%2 == 0 {
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e.mapElemKey()
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} else {
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e.mapElemValue()
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}
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{{ encmd .Elem "v[j]"}}
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}
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e.mapEnd()
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}
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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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e.mapStart(len(v))
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if e.h.Canonical { {{/* need to figure out .NoCanonical */}}
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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([]bytesIntf, len(v))
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var i, l uint {{/* put loop variables outside. seems currently needed for better perf */}}
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var vp *bytesIntf
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for k2 := range v {
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l = uint(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(bytesIntfSlice(v2))
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for j := range v2 {
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e.mapElemKey()
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e.asis(v2[j].v)
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e.mapElemValue()
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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 uint
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for k := range v {
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v2[i] = {{if eq $x .MapKey}}k{{else}}{{ $x }}(k){{end}}
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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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e.mapElemKey()
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{{if eq .MapKey "string"}} e.e.EncodeString(k2) {{else}}{{ $y := printf "%s(k2)" .MapKey }}{{if eq $x .MapKey }}{{ $y = "k2" }}{{end}}{{ encmd .MapKey $y }}{{end}}
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e.mapElemValue()
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{{ $y := printf "v[%s(k2)]" .MapKey }}{{if eq $x .MapKey }}{{ $y = "v[k2]" }}{{end}}{{ 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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e.mapElemKey()
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{{if eq .MapKey "string"}} e.e.EncodeString(k2) {{else}}{{ encmd .MapKey "k2"}}{{end}}
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e.mapElemValue()
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{{ encmd .Elem "v2"}}
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}
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}
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e.mapEnd()
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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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var changed bool
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var containerLen int
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switch v := iv.(type) {
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{{range .Values}}{{if not .Primitive}}{{if not .MapKey }}{{if ne .Elem "uint8" -}}
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case []{{ .Elem }}:
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fastpathTV.{{ .MethodNamePfx "Dec" false }}N(v, d)
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case *[]{{ .Elem }}:
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var v2 []{{ .Elem }}
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if v2, changed = fastpathTV.{{ .MethodNamePfx "Dec" false }}Y(*v, d); changed {
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*v = v2
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}
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{{end}}{{end}}{{end}}{{end -}}
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{{range .Values}}{{if not .Primitive}}{{if .MapKey }}{{/*
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// maps only change if nil, and in that case, there's no point copying
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*/ -}}
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case map[{{ .MapKey }}]{{ .Elem }}:
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containerLen = d.mapStart()
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if containerLen != decContainerLenNil {
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if containerLen != 0 {
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fastpathTV.{{ .MethodNamePfx "Dec" false }}L(v, containerLen, d)
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}
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d.mapEnd()
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}
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case *map[{{ .MapKey }}]{{ .Elem }}:
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{{/*
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containerLen = d.mapStart()
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if containerLen == 0 {
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d.mapEnd()
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} else if containerLen == decContainerLenNil {
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*v = nil
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} else {
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if *v == nil {
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*v = make(map[{{ .MapKey }}]{{ .Elem }}, decInferLen(containerLen, d.h.MaxInitLen, {{ .Size }}))
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}
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fastpathTV.{{ .MethodNamePfx "Dec" false }}L(*v, containerLen, d)
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}
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// consider delegating fully to X - encoding *map is uncommon, so ok to pay small function call cost
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*/ -}}
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fastpathTV.{{ .MethodNamePfx "Dec" false }}X(v, d)
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{{end}}{{end}}{{end -}}
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default:
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_ = v // workaround https://github.com/golang/go/issues/12927 seen in go1.4
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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 }}:
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*v = nil
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{{end}}{{end}}{{end}}
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{{range .Values}}{{if not .Primitive}}{{if .MapKey -}}
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case *map[{{ .MapKey }}]{{ .Elem }}:
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*v = nil
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{{end}}{{end}}{{end}}
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default:
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_ = v // workaround https://github.com/golang/go/issues/12927 seen in go1.4
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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 f.seq != seqTypeArray && rv.Kind() == reflect.Ptr {
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vp := rv2i(rv).(*[]{{ .Elem }})
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if v, changed := fastpathTV.{{ .MethodNamePfx "Dec" false }}Y(*vp, d); changed { *vp = v }
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} else {
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fastpathTV.{{ .MethodNamePfx "Dec" false }}N(rv2i(rv).([]{{ .Elem }}), 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 }}Y(*vp, d); changed { *vp = v }
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}
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func (fastpathT) {{ .MethodNamePfx "Dec" false }}Y(v []{{ .Elem }}, d *Decoder) (_ []{{ .Elem }}, changed bool) {
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slh, containerLenS := d.decSliceHelperStart()
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if slh.IsNil {
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if v == nil { return }
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return nil, true
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}
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if containerLenS == 0 {
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if v == nil { v = []{{ .Elem }}{} } else if len(v) != 0 { v = v[:0] }
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slh.End()
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return v, true
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}
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hasLen := containerLenS > 0
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var xlen int
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if hasLen {
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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[:uint(xlen)]
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} else {
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v = make([]{{ .Elem }}, uint(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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var j int
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for j = 0; (hasLen && j < containerLenS) || !(hasLen || d.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 }}, uint(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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if j >= len(v) {
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v = append(v, {{ zerocmd .Elem }})
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changed = true
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}
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slh.ElemContainerState(j)
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{{ if eq .Elem "interface{}" }}d.decode(&v[uint(j)]){{ else }}v[uint(j)] = {{ decmd .Elem }}{{ end }}
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}
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if j < len(v) {
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v = v[:uint(j)]
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changed = true
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} else if j == 0 && v == nil {
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v = []{{ .Elem }}{}
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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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func (fastpathT) {{ .MethodNamePfx "Dec" false }}N(v []{{ .Elem }}, d *Decoder) {
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slh, containerLenS := d.decSliceHelperStart()
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if slh.IsNil {
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return
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}
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if containerLenS == 0 {
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slh.End()
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return
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}
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hasLen := containerLenS > 0
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for j := 0; (hasLen && j < containerLenS) || !(hasLen || d.checkBreak()); j++ {
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{{/* // if indefinite, etc, then expand the slice if necessary */ -}}
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if j >= len(v) {
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fastpathDecArrayCannotExpand(slh, hasLen, len(v), j, containerLenS)
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return
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}
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slh.ElemContainerState(j)
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{{ if eq .Elem "interface{}" -}}
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d.decode(&v[uint(j)])
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{{- else -}}
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v[uint(j)] = {{ decmd .Elem }}
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{{- end }}
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}
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slh.End()
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}
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{{end}}{{end}}{{end -}}
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func fastpathDecArrayCannotExpand(slh decSliceHelper, hasLen bool, lenv, j, containerLenS int) {
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slh.d.arrayCannotExpand(lenv, j+1)
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slh.ElemContainerState(j)
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slh.d.swallow()
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j++
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for ; (hasLen && j < containerLenS) || !(hasLen || slh.d.checkBreak()); j++ {
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slh.ElemContainerState(j)
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slh.d.swallow()
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}
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slh.End()
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}
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|
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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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containerLen := d.mapStart()
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if containerLen == decContainerLenNil {
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if rv.Kind() == reflect.Ptr {
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*(rv2i(rv).(*map[{{ .MapKey }}]{{ .Elem }})) = nil
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}
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} else {
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if rv.Kind() == reflect.Ptr {
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vp, _ := rv2i(rv).(*map[{{ .MapKey }}]{{ .Elem }})
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if *vp == nil {
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*vp = make(map[{{ .MapKey }}]{{ .Elem }}, decInferLen(containerLen, d.h.MaxInitLen, {{ .Size }}))
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}
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if containerLen != 0 {
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fastpathTV.{{ .MethodNamePfx "Dec" false }}L(*vp, containerLen, d)
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}
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} else if containerLen != 0 {
|
|
fastpathTV.{{ .MethodNamePfx "Dec" false }}L(rv2i(rv).(map[{{ .MapKey }}]{{ .Elem }}), containerLen, d)
|
|
}
|
|
d.mapEnd()
|
|
}
|
|
}
|
|
func (f fastpathT) {{ .MethodNamePfx "Dec" false }}X(vp *map[{{ .MapKey }}]{{ .Elem }}, d *Decoder) {
|
|
containerLen := d.mapStart()
|
|
if containerLen == decContainerLenNil {
|
|
*vp = nil
|
|
} else {
|
|
if *vp == nil {
|
|
*vp = make(map[{{ .MapKey }}]{{ .Elem }}, decInferLen(containerLen, d.h.MaxInitLen, {{ .Size }}))
|
|
}
|
|
if containerLen != 0 {
|
|
f.{{ .MethodNamePfx "Dec" false }}L(*vp, containerLen, d)
|
|
}
|
|
d.mapEnd()
|
|
}
|
|
}
|
|
func (fastpathT) {{ .MethodNamePfx "Dec" false }}L(v map[{{ .MapKey }}]{{ .Elem }}, containerLen int, d *Decoder) {
|
|
{{/* No need to check if containerLen == decContainerLenNil, as that is checked by R and L above */ -}}
|
|
{{if eq .Elem "interface{}" }}mapGet := v != nil && !d.h.MapValueReset && !d.h.InterfaceReset
|
|
{{else if eq .Elem "bytes" "[]byte" }}mapGet := v != nil && !d.h.MapValueReset
|
|
{{end -}}
|
|
var mk {{ .MapKey }}
|
|
var mv {{ .Elem }}
|
|
hasLen := containerLen > 0
|
|
for j := 0; (hasLen && j < containerLen) || !(hasLen || d.checkBreak()); j++ {
|
|
d.mapElemKey()
|
|
{{ if eq .MapKey "interface{}" }}mk = nil
|
|
d.decode(&mk)
|
|
if bv, bok := mk.([]byte); bok {
|
|
mk = d.string(bv) {{/* // maps cannot have []byte as key. switch to string. */}}
|
|
}{{ else }}mk = {{ decmd .MapKey }}{{ end }}
|
|
d.mapElemValue()
|
|
{{ if eq .Elem "interface{}" "[]byte" "bytes" -}}
|
|
if mapGet { mv = v[mk] } else { mv = nil }
|
|
{{ end -}}
|
|
{{ if eq .Elem "interface{}" -}}
|
|
d.decode(&mv)
|
|
{{ else if eq .Elem "[]byte" "bytes" -}}
|
|
mv = d.d.DecodeBytes(mv, false)
|
|
{{ else -}}
|
|
mv = {{ decmd .Elem }}
|
|
{{ end -}}
|
|
if v != nil { v[mk] = mv }
|
|
}
|
|
}
|
|
{{end}}{{end}}{{end}}
|