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initfn.go
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initfn.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 (
`fmt`
`sync`
`unsafe`
`github.com/cloudwego/frugal/internal/atm/hir`
`github.com/cloudwego/frugal/internal/rt`
)
var (
initFnLock = new(sync.RWMutex)
initFnCache = make(map[unsafe.Pointer]*hir.CallHandle)
)
func toInitFn(fp unsafe.Pointer) (fn func(unsafe.Pointer)) {
*(*unsafe.Pointer)(unsafe.Pointer(&fn)) = unsafe.Pointer(&fp)
return
}
func addInitFn(fp unsafe.Pointer) *hir.CallHandle {
var ok bool
var fn *hir.CallHandle
/* check function cache */
initFnLock.RLock()
fn, ok = initFnCache[fp]
initFnLock.RUnlock()
/* exists, use the cached value */
if ok {
return fn
}
/* lock in write mode */
initFnLock.Lock()
defer initFnLock.Unlock()
/* double check */
if fn, ok = initFnCache[fp]; ok {
return fn
}
/* still not exists, register a new function */
fn = hir.RegisterGCall(toInitFn(fp), func(ctx hir.CallContext) {
if !ctx.Verify("*", "") {
panic(fmt.Sprintf("invalid %s call", rt.FuncName(fp)))
} else {
toInitFn(fp)(ctx.Ap(0))
}
})
/* update the cache */
initFnCache[fp] = fn
return fn
}