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Adding bigendian support #11

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Adding bigendian support #11

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11 changes: 9 additions & 2 deletions backends/golang/init.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,19 +2,25 @@ package golang

import (
"flag"
"fmt"
"go/format"

"github.com/andyleap/gencode/schema"
)

type GolangBackend struct {
Package string
Unsafe bool
Package string
Unsafe bool
BigEndian bool
}

func (gb *GolangBackend) Generate(s *schema.Schema) (string, error) {
w := &Walker{}
w.Unsafe = gb.Unsafe
w.BigEndian = gb.BigEndian
if w.Unsafe && w.BigEndian {
return "", fmt.Errorf("Unsafe and BigEndian incompatible")
}
def, err := w.WalkSchema(s, gb.Package)
if err != nil {
return "", err
Expand All @@ -30,6 +36,7 @@ func (gb *GolangBackend) Flags() *flag.FlagSet {
flags := flag.NewFlagSet("Go", flag.ExitOnError)
flags.StringVar(&gb.Package, "package", "main", "package to build the gencode system for")
flags.BoolVar(&gb.Unsafe, "unsafe", false, "Generate faster, but unsafe code")
flags.BoolVar(&gb.BigEndian, "bigendian", false, "Generate bigendian code, incompatible with unsafe.")
return flags
}

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5 changes: 3 additions & 2 deletions backends/golang/schema.go
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Original file line number Diff line number Diff line change
Expand Up @@ -11,18 +11,19 @@ type Walker struct {
Offset int
IAdjusted bool
Unsafe bool
BigEndian bool
}

func (w *Walker) WalkSchema(s *schema.Schema, Package string) (parts *StringBuilder, err error) {
parts = &StringBuilder{}
parts.Append(fmt.Sprintf(`package %s

import (
"unsafe"
"io"
"time"
)

var (
_ = unsafe.Sizeof(0)
_ = io.ReadFull
Expand Down
18 changes: 10 additions & 8 deletions backends/golang/type_float.go
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
package golang

import (
"sort"
"text/template"

"github.com/andyleap/gencode/schema"
Expand All @@ -12,11 +13,12 @@ var (

func init() {
FloatTemps = template.New("FloatTemps").Funcs(template.FuncMap{
"Bytes": func(bits int) int {
return bits / 8
},
"BitRange": func(bits int) []int {
return []int{0, 8, 16, 24, 32, 40, 48, 56, 64}[0:(bits / 8)]
"BitRange": func(bits int, bigEndian bool) []int {
ar := []int{0, 8, 16, 24, 32, 40, 48, 56, 64}[0:(bits / 8)]
if bigEndian {
sort.Sort(sort.Reverse(sort.IntSlice(ar)))
}
return ar
},
})

Expand All @@ -26,8 +28,8 @@ func init() {
*(*float{{.Bits}})(unsafe.Pointer(&buf[{{if .W.IAdjusted}}i + {{end}}{{.W.Offset}}])) = {{.Target}}
{{else}}
v := *(*uint{{.Bits}})(unsafe.Pointer(&({{.Target}})))
{{range BitRange .Bits}}
buf[{{if $.W.IAdjusted}}i + {{end}}{{Bytes .}} + {{$.W.Offset}}] = byte(v >> {{.}})
{{range $pos, $bits := BitRange .Bits .W.BigEndian}}
buf[{{if $.W.IAdjusted}}i + {{end}}{{$pos}} + {{$.W.Offset}}] = byte(v >> {{$bits}})
{{end}}
{{end}}
}`))
Expand All @@ -36,7 +38,7 @@ func init() {
{{if .W.Unsafe}}
{{.Target}} = *(*float{{.Bits}})(unsafe.Pointer(&buf[{{if .W.IAdjusted}}i + {{end}}{{.W.Offset}}]))
{{else}}
v := 0{{range BitRange .Bits}} | (uint{{$.Bits}}(buf[{{if $.W.IAdjusted}}i + {{end}}{{Bytes .}} + {{$.W.Offset}}]) << {{.}}){{end}}
v := 0{{range $pos, $bits := BitRange .Bits .W.BigEndian}} | (uint{{$.Bits}}(buf[{{if $.W.IAdjusted}}i + {{end}}{{$pos}} + {{$.W.Offset}}]) << {{$bits}}){{end}}
{{.Target}} = *(*float{{.Bits}})(unsafe.Pointer(&v))
{{end}}
}`))
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32 changes: 17 additions & 15 deletions backends/golang/type_int.go
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
package golang

import (
"sort"
"text/template"

"github.com/andyleap/gencode/schema"
Expand All @@ -12,18 +13,19 @@ var (

func init() {
IntTemps = template.New("IntTemps").Funcs(template.FuncMap{
"Bytes": func(bits int) int {
return bits / 8
},
"BitRange": func(bits int) []int {
return []int{0, 8, 16, 24, 32, 40, 48, 56, 64}[0:(bits / 8)]
"BitRange": func(bits int, bigEndian bool) []int {
ar := []int{0, 8, 16, 24, 32, 40, 48, 56, 64}[0:(bits / 8)]
if bigEndian {
sort.Sort(sort.Reverse(sort.IntSlice(ar)))
}
return ar
},
})

template.Must(IntTemps.New("marshal").Parse(`
{
{{if .VarInt }}

t := uint{{.Bits}}({{.Target}})
{{if .Signed}}
t <<= 1
Expand All @@ -38,17 +40,17 @@ func init() {
}
buf[i + {{.W.Offset}}] = byte(t)
i++

{{else}}

{{if .W.Unsafe}}
*(*{{if not .Signed}}u{{end}}int{{.Bits}})(unsafe.Pointer(&buf[{{if $.W.IAdjusted}}i + {{end}}{{$.W.Offset}}])) = {{.Target}}
{{else}}
{{range BitRange .Bits}}
buf[{{if $.W.IAdjusted}}i + {{end}}{{Bytes .}} + {{$.W.Offset}}] = byte({{$.Target}} >> {{.}})
{{range $pos, $bits := BitRange .Bits .W.BigEndian}}
buf[{{if $.W.IAdjusted}}i + {{end}}{{$pos}} + {{$.W.Offset}}] = byte({{$.Target}} >> {{$bits}})
{{end}}
{{end}}

{{end}}
}`))
template.Must(IntTemps.New("unmarshal").Parse(`
Expand All @@ -70,15 +72,15 @@ func init() {
{{else}}
{{.Target}} = t
{{end}}

{{else}}

{{if .W.Unsafe}}
{{.Target}} = *(*{{if not .Signed}}u{{end}}int{{.Bits}})(unsafe.Pointer(&buf[{{if $.W.IAdjusted}}i + {{end}}{{$.W.Offset}}]))
{{else}}
{{$.Target}} = 0{{range BitRange .Bits}} | ({{if not $.Signed}}u{{end}}int{{$.Bits}}(buf[{{if $.W.IAdjusted}}i + {{end}}{{Bytes .}} + {{$.W.Offset}}]) << {{.}}){{end}}
{{$.Target}} = 0{{range $pos, $bits := BitRange .Bits .W.BigEndian}} | ({{if not $.Signed}}u{{end}}int{{$.Bits}}(buf[{{if $.W.IAdjusted}}i + {{end}}{{$pos}} + {{$.W.Offset}}]) << {{$bits}}){{end}}
{{end}}

{{end}}
}`))
template.Must(IntTemps.New("field").Parse(`{{if not .Signed}}u{{end}}int{{.Bits}}`))
Expand Down