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typemap.go
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typemap.go
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// Copyright 2018 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License. See the AUTHORS file
// for names of contributors.
package templates
func init() {
TemplateSources["50typemap"] = `
{{- $v := . -}}
{{- $Context := T $v "Context" -}}
{{- $Engine := t $v "Engine" -}}
{{- $TypeId := T $v "TypeId" -}}
{{- $WalkerFn := T $v "WalkerFn" -}}
var {{ $Engine }} = e.New(e.TypeMap {
// ------ Structs ------
{{ range $s := Structs $v }}{{ TypeId $s }}: {
Copy: func(dest, from e.Ptr) { *(*{{ $s }})(dest) = *(*{{ $s }})(from) },
Facade: func(impl e.ContextImpl, fn e.FacadeFn, x e.Ptr) e.DecisionImpl {
return fn.({{ $WalkerFn }})({{ $Context }}{impl}, (*{{ $s }})(x)).impl
},
Fields: []e.FieldInfo {
{{ range $f := $s.Fields -}}
{ Name: "{{ $f }}", Offset: unsafe.Offsetof({{ $s }}{}.{{ $f }}), Target: e.TypeId({{ TypeId $f.Target }})},
{{ end }}
},
NewStruct: func() e.Ptr { return e.Ptr(&{{ $s }}{}) },
SizeOf: unsafe.Sizeof({{ $s }}{}),
Kind: e.KindStruct,
TypeId: e.TypeId({{ TypeId $s }}),
},
{{ end }}
// ------ Interfaces ------
{{ range $s := Intfs $v }}{{ TypeId $s }}: {
Copy: func(dest, from e.Ptr) {
*(*{{ $s }})(dest) = *(*{{ $s }})(from)
},
IntfType: func(x e.Ptr) e.TypeId {
d := *(*{{ $s }})(x)
switch d.(type) {
{{ range $imp := Implementors $s -}}
case {{ $imp.Actual }}: return e.TypeId({{ TypeId $imp.Underlying }});
{{- end }}
default:
return 0
}
},
IntfWrap: func(id e.TypeId, x e.Ptr) e.Ptr {
var d {{ $s }}
switch {{ $TypeId }}(id) {
{{ range $imp := Implementors $s -}}
case {{ TypeId $imp.Actual }}: d = *(*{{ $imp.Actual }})(x);
{{- end }}
}
return e.Ptr(&d)
},
SizeOf: unsafe.Sizeof({{ $s }}(nil)),
Kind: e.KindInterface,
TypeId: e.TypeId({{ TypeId $s }}),
},
{{ end }}
// ------ Pointers ------
{{ range $s := Pointers $v }}{{ TypeId $s }}: {
Copy: func(dest, from e.Ptr) {
*(*{{ $s }})(dest) = *(*{{ $s }})(from)
},
Elem: e.TypeId({{ TypeId $s.Elem }}),
SizeOf: unsafe.Sizeof(({{ $s }})(nil)),
Kind: e.KindPointer,
TypeId: e.TypeId({{ TypeId $s }}),
},
{{ end }}
// ------ Slices ------
{{ range $s := Slices $v }}{{ TypeId $s }}: {
Copy: func(dest, from e.Ptr) {
*(*{{ $s }})(dest) = *(*{{ $s }})(from)
},
Elem: e.TypeId({{ TypeId $s.Elem }}),
Kind: e.KindSlice,
NewSlice: func(size int) e.Ptr {
x := make({{ $s }}, size)
return e.Ptr(&x)
},
SizeOf: unsafe.Sizeof(({{ $s }})(nil)),
TypeId: e.TypeId({{ TypeId $s }}),
},
{{ end }}
})
// These are lightweight type tokens.
const (
_ {{ T $v "TypeId" }} = iota
{{ range $t := $v.Types }}{{ TypeId $t }};{{ end }}
)
var {{ t $v "TypeIdNames" }} = [...]string{
"<NIL>",
{{ range $t := $v.Types }}"{{ $t }}",
{{ end }} }
// String is for debugging use only.
func (t {{ $TypeId }}) String() string {
return {{ t $v "TypeIdNames" }}[t]
}
`
}