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// Package unsafe provides wrapper of standard library unsafe package to be imported natively in Yaegi.
package unsafe
import (
"reflect"
"unsafe"
)
// Symbols stores the map of unsafe package symbols.
var Symbols = map[string]map[string]reflect.Value{}
func init() {
Symbols["github.com/traefik/yaegi/stdlib/unsafe/unsafe"] = map[string]reflect.Value{
"Symbols": reflect.ValueOf(Symbols),
}
Symbols["github.com/traefik/yaegi/yaegi"] = map[string]reflect.Value{
"convert": reflect.ValueOf(convert),
}
Symbols["unsafe/unsafe"]["Add"] = reflect.ValueOf(add)
// Add builtin functions to unsafe, also implemented in interp/cfg.go.
Symbols["unsafe/unsafe"]["Sizeof"] = reflect.ValueOf(sizeof)
Symbols["unsafe/unsafe"]["Alignof"] = reflect.ValueOf(alignof)
// The following is used for signature check only.
Symbols["unsafe/unsafe"]["Offsetof"] = reflect.ValueOf(func(interface{}) uintptr { return 0 })
}
func convert(from, to reflect.Type) func(src, dest reflect.Value) {
switch {
case to.Kind() == reflect.UnsafePointer && from.Kind() == reflect.Uintptr:
return uintptrToUnsafePtr
case to.Kind() == reflect.UnsafePointer:
return func(src, dest reflect.Value) {
dest.SetPointer(unsafe.Pointer(src.Pointer()))
}
case to.Kind() == reflect.Uintptr && from.Kind() == reflect.UnsafePointer:
return func(src, dest reflect.Value) {
ptr := src.Interface().(unsafe.Pointer)
dest.Set(reflect.ValueOf(uintptr(ptr)))
}
case from.Kind() == reflect.UnsafePointer:
return func(src, dest reflect.Value) {
ptr := src.Interface().(unsafe.Pointer)
v := reflect.NewAt(dest.Type().Elem(), ptr)
dest.Set(v)
}
default:
return nil
}
}
func add(ptr unsafe.Pointer, l int) unsafe.Pointer {
return unsafe.Add(ptr, l)
}
func sizeof(i interface{}) uintptr {
return reflect.ValueOf(i).Type().Size()
}
func alignof(i interface{}) uintptr {
return uintptr(reflect.ValueOf(i).Type().Align())
}
//go:nocheckptr
func uintptrToUnsafePtr(src, dest reflect.Value) {
dest.SetPointer(unsafe.Pointer(src.Interface().(uintptr))) //nolint:govet
}
//go:generate ../../internal/cmd/extract/extract unsafe
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