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Merge pull request #256 from goccy/feature/improve-map-decoder-perf 

Improve performance of decoding map
This commit is contained in:
Masaaki Goshima 2021-06-23 22:11:29 +09:00 committed by GitHub
parent c423502f97 80c460c74b
commit 4f9edb7bc0
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 34 additions and 17 deletions
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23
internal/decoder/map.go
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@ -1,6 +1,7 @@
package decoder
import (
"reflect"
"unsafe"
"github.com/goccy/go-json/internal/errors"
@ -11,6 +12,7 @@ type mapDecoder struct {
mapType *runtime.Type
keyType *runtime.Type
valueType *runtime.Type
stringKeyType bool
keyDecoder Decoder
valueDecoder Decoder
structName string
@ -22,6 +24,7 @@ func newMapDecoder(mapType *runtime.Type, keyType *runtime.Type, keyDec Decoder,
mapType: mapType,
keyDecoder: keyDec,
keyType: keyType,
stringKeyType: keyType.Kind() == reflect.String,
valueType: valueType,
valueDecoder: valueDec,
structName: structName,
@ -32,9 +35,23 @@ func newMapDecoder(mapType *runtime.Type, keyType *runtime.Type, keyDec Decoder,
//go:linkname makemap reflect.makemap
func makemap(*runtime.Type, int) unsafe.Pointer
//nolint:golint
//go:linkname mapassign_faststr runtime.mapassign_faststr
//go:noescape
func mapassign_faststr(t *runtime.Type, m unsafe.Pointer, s string) unsafe.Pointer
//go:linkname mapassign reflect.mapassign
//go:noescape
func mapassign(t *runtime.Type, m unsafe.Pointer, key, val unsafe.Pointer)
func mapassign(t *runtime.Type, m unsafe.Pointer, k, v unsafe.Pointer)
func (d *mapDecoder) mapassign(t *runtime.Type, m, k, v unsafe.Pointer) {
if d.stringKeyType {
mapV := mapassign_faststr(d.mapType, m, *(*string)(k))
typedmemmove(d.valueType, mapV, v)
} else {
mapassign(t, m, k, v)
}
}
func (d *mapDecoder) DecodeStream(s *Stream, depth int64, p unsafe.Pointer) error {
depth++
@ -77,7 +94,7 @@ func (d *mapDecoder) DecodeStream(s *Stream, depth int64, p unsafe.Pointer) erro
if err := d.valueDecoder.DecodeStream(s, depth, v); err != nil {
return err
}
mapassign(d.mapType, mapValue, k, v)
d.mapassign(d.mapType, mapValue, k, v)
s.skipWhiteSpace()
if s.equalChar('}') {
**(**unsafe.Pointer)(unsafe.Pointer(&p)) = mapValue
@ -141,7 +158,7 @@ func (d *mapDecoder) Decode(ctx *RuntimeContext, cursor, depth int64, p unsafe.P
if err != nil {
return 0, err
}
mapassign(d.mapType, mapValue, k, v)
d.mapassign(d.mapType, mapValue, k, v)
cursor = skipWhiteSpace(buf, valueCursor)
if buf[cursor] == '}' {
**(**unsafe.Pointer)(unsafe.Pointer(&p)) = mapValue