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/*
* Copyright 2021 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 loader
import (
`reflect`
`sync`
`unsafe`
`github.com/bytedance/sonic/internal/rt`
)
//go:linkname lastmoduledatap runtime.lastmoduledatap
//goland:noinspection GoUnusedGlobalVariable
var lastmoduledatap *_ModuleData
//go:linkname moduledataverify1 runtime.moduledataverify1
func moduledataverify1(_ *_ModuleData)
// PCDATA and FUNCDATA table indexes.
//
// See funcdata.h and $GROOT/src/cmd/internal/objabi/funcdata.go.
const (
_FUNCDATA_ArgsPointerMaps = 0
_FUNCDATA_LocalsPointerMaps = 1
)
type funcInfo struct {
*_Func
datap *_ModuleData
}
//go:linkname findfunc runtime.findfunc
func findfunc(pc uintptr) funcInfo
//go:linkname funcdata runtime.funcdata
func funcdata(f funcInfo, i uint8) unsafe.Pointer
var (
modLock sync.Mutex
modList []*_ModuleData
)
var emptyByte byte
func encodeVariant(v int) []byte {
var u int
var r []byte
/* split every 7 bits */
for v > 127 {
u = v & 0x7f
v = v >> 7
r = append(r, byte(u) | 0x80)
}
/* check for last one */
if v == 0 {
return r
}
/* add the last one */
r = append(r, byte(v))
return r
}
func registerModule(mod *_ModuleData) {
modLock.Lock()
modList = append(modList, mod)
lastmoduledatap.next = mod
lastmoduledatap = mod
modLock.Unlock()
}
func stackMap(f interface{}) (args uintptr, locals uintptr) {
fv := reflect.ValueOf(f)
if fv.Kind() != reflect.Func {
panic("f must be reflect.Func kind!")
}
fi := findfunc(fv.Pointer())
return uintptr(funcdata(fi, uint8(_FUNCDATA_ArgsPointerMaps))), uintptr(funcdata(fi, uint8(_FUNCDATA_LocalsPointerMaps)))
}
var moduleCache = struct{
m map[*_ModuleData][]byte
l sync.Mutex
}{
m : make(map[*_ModuleData][]byte),
}
func cacheStackmap(argPtrs []bool, localPtrs []bool, mod *_ModuleData) (argptrs uintptr, localptrs uintptr) {
as := rt.StackMapBuilder{}
for _, b := range argPtrs {
as.AddField(b)
}
ab, _ := as.Build().MarshalBinary()
ls := rt.StackMapBuilder{}
for _, b := range localPtrs {
ls.AddField(b)
}
lb, _ := ls.Build().MarshalBinary()
cache := make([]byte, len(ab) + len(lb))
copy(cache, ab)
copy(cache[len(ab):], lb)
moduleCache.l.Lock()
moduleCache.m[mod] = cache
moduleCache.l.Unlock()
return uintptr(rt.IndexByte(cache, 0)), uintptr(rt.IndexByte(cache, len(ab)))
}
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