65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
// +build go1.13,!go1.15
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// Package unsafe provides wrapper of standard library unsafe package to be imported natively in Yaegi.
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package unsafe
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import (
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"reflect"
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"unsafe"
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)
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// Symbols stores the map of unsafe package symbols.
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var Symbols = map[string]map[string]reflect.Value{}
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func init() {
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Symbols["github.com/containous/yaegi/stdlib/unsafe"] = map[string]reflect.Value{
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"Symbols": reflect.ValueOf(Symbols),
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}
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Symbols["github.com/containous/yaegi"] = map[string]reflect.Value{
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"convert": reflect.ValueOf(convert),
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}
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// Add builtin functions to unsafe.
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Symbols["unsafe"]["Sizeof"] = reflect.ValueOf(sizeof)
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Symbols["unsafe"]["Alignof"] = reflect.ValueOf(alignof)
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}
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func convert(from, to reflect.Type) func(src, dest reflect.Value) {
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switch {
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case to.Kind() == reflect.UnsafePointer && from.Kind() == reflect.Uintptr:
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return uintptrToUnsafePtr
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case to.Kind() == reflect.UnsafePointer:
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return func(src, dest reflect.Value) {
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dest.SetPointer(unsafe.Pointer(src.Pointer()))
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}
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case to.Kind() == reflect.Uintptr && from.Kind() == reflect.UnsafePointer:
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return func(src, dest reflect.Value) {
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ptr := src.Interface().(unsafe.Pointer)
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dest.Set(reflect.ValueOf(uintptr(ptr)))
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}
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case from.Kind() == reflect.UnsafePointer:
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return func(src, dest reflect.Value) {
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ptr := src.Interface().(unsafe.Pointer)
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v := reflect.NewAt(dest.Type().Elem(), ptr)
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dest.Set(v)
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}
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default:
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return nil
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}
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}
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func sizeof(i interface{}) uintptr {
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return reflect.ValueOf(i).Type().Size()
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}
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func alignof(i interface{}) uintptr {
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return uintptr(reflect.ValueOf(i).Type().Align())
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}
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//go:nocheckptr
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func uintptrToUnsafePtr(src, dest reflect.Value) {
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dest.SetPointer(unsafe.Pointer(src.Interface().(uintptr))) //nolint:govet
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}
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//go:generate ../../cmd/goexports/goexports unsafe
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