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decoder.go
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decoder.go
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/*
* Copyright 2022 ByteDance Inc.
*
* 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.
*/
package decoder
import (
`reflect`
`sync/atomic`
`unsafe`
`github.com/cloudwego/frugal/internal/opts`
`github.com/cloudwego/frugal/internal/rt`
`github.com/cloudwego/frugal/internal/utils`
)
type Decoder func (
buf unsafe.Pointer,
nb int,
i int,
p unsafe.Pointer,
rs *RuntimeState,
st int,
) (int, error)
var (
HitCount uint64 = 0
MissCount uint64 = 0
TypeCount uint64 = 0
)
var (
programCache = utils.CreateProgramCache()
)
func decode(vt *rt.GoType, buf unsafe.Pointer, nb int, i int, p unsafe.Pointer, rs *RuntimeState, st int) (int, error) {
if dec, err := resolve(vt); err != nil {
return 0, err
} else {
return dec(buf, nb, i, p, rs, st)
}
}
func resolve(vt *rt.GoType) (Decoder, error) {
var err error
var val interface{}
/* fast-path: type is cached */
if val = programCache.Get(vt); val != nil {
atomic.AddUint64(&HitCount, 1)
return val.(Decoder), nil
}
/* record the cache miss, and compile the type */
atomic.AddUint64(&MissCount, 1)
val, err = programCache.Compute(vt, compile)
/* check for errors */
if err != nil {
return nil, err
}
/* record the successful compilation */
atomic.AddUint64(&TypeCount, 1)
return val.(Decoder), nil
}
func compile(vt *rt.GoType) (interface{}, error) {
if pp, err := CreateCompiler().CompileAndFree(vt.Pack()); err != nil {
return nil, err
} else {
return Link(Translate(pp)), nil
}
}
func mkcompile(ty map[reflect.Type]struct{}, opts opts.Options) func(*rt.GoType) (interface{}, error) {
return func(vt *rt.GoType) (interface{}, error) {
cc := CreateCompiler()
pp, err := cc.Apply(opts).Compile(vt.Pack())
/* add all the deferred types */
for t := range cc.d {
ty[t] = struct{}{}
}
/* translate and link the program */
if err != nil {
return nil, err
} else {
return Link(Translate(pp)), nil
}
}
}
type DecodeError struct {
vt *rt.GoType
}
func (self DecodeError) Error() string {
if self.vt == nil {
return "frugal: unmarshal to nil interface"
} else if self.vt.Kind() == reflect.Ptr {
return "frugal: unmarshal to nil " + self.vt.String()
} else {
return "frugal: unmarshal to non-pointer " + self.vt.String()
}
}
func Pretouch(vt *rt.GoType, opts opts.Options) (map[reflect.Type]struct{}, error) {
var err error
var ret map[reflect.Type]struct{}
/* check for cached types */
if programCache.Get(vt) != nil {
return nil, nil
}
/* compile & load the type */
ret = make(map[reflect.Type]struct{})
_, err = programCache.Compute(vt, mkcompile(ret, opts))
/* check for errors */
if err != nil {
return nil, err
}
/* add the type count */
atomic.AddUint64(&TypeCount, 1)
return ret, nil
}
func DecodeObject(buf []byte, val interface{}) (ret int, err error) {
vv := rt.UnpackEface(val)
vt := vv.Type
/* check for nil interface */
if vt == nil || vv.Value == nil || vt.Kind() != reflect.Ptr {
return 0, DecodeError { vt }
}
/* create a new runtime state */
et := rt.PtrElem(vt)
st := newRuntimeState()
sl := (*rt.GoSlice)(unsafe.Pointer(&buf))
/* call the encoder, and return the runtime state into pool */
ret, err = decode(et, sl.Ptr, sl.Len, 0, vv.Value, st, 0)
freeRuntimeState(st)
return
}