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// +build !gccgo
package reflect2
import (
"reflect"
"sync"
"unsafe"
)
// typelinks2 for 1.7 ~
//go:linkname typelinks2 reflect.typelinks
func typelinks2() (sections []unsafe.Pointer, offset [][]int32)
// initOnce guards initialization of types and packages
var initOnce sync.Once
var types map[string]reflect.Type
var packages map[string]map[string]reflect.Type
// discoverTypes initializes types and packages
func discoverTypes() {
types = make(map[string]reflect.Type)
packages = make(map[string]map[string]reflect.Type)
loadGoTypes()
}
func loadGoTypes() {
var obj interface{} = reflect.TypeOf(0)
sections, offset := typelinks2()
for i, offs := range offset {
rodata := sections[i]
for _, off := range offs {
(*emptyInterface)(unsafe.Pointer(&obj)).word = resolveTypeOff(unsafe.Pointer(rodata), off)
typ := obj.(reflect.Type)
if typ.Kind() == reflect.Ptr && typ.Elem().Kind() == reflect.Struct {
loadedType := typ.Elem()
pkgTypes := packages[loadedType.PkgPath()]
if pkgTypes == nil {
pkgTypes = map[string]reflect.Type{}
packages[loadedType.PkgPath()] = pkgTypes
}
types[loadedType.String()] = loadedType
pkgTypes[loadedType.Name()] = loadedType
}
}
}
}
type emptyInterface struct {
typ unsafe.Pointer
word unsafe.Pointer
}
// TypeByName return the type by its name, just like Class.forName in java
func TypeByName(typeName string) Type {
initOnce.Do(discoverTypes)
return Type2(types[typeName])
}
// TypeByPackageName return the type by its package and name
func TypeByPackageName(pkgPath string, name string) Type {
initOnce.Do(discoverTypes)
pkgTypes := packages[pkgPath]
if pkgTypes == nil {
return nil
}
return Type2(pkgTypes[name])
}
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