func TypeSizeInBits(typ types.Type) int {
switch typ := typ.(type) {
case *types.Int:
w := typ.Width()
for w%8 != 0 {
w++
}
return w
case *types.Float:
return typ.Type().Width()
case *types.Pointer:
return 64
case *types.Array:
return TypeSizeInBits(typ.Element()) * typ.Length()
case *types.Struct:
return newStructLayout(typ).size
default:
panic("unim")
}
}
// will always be multiple of 8
func TypeAlignmentInBits(typ types.Type) int {
switch typ := typ.(type) {
case *types.Struct:
return newStructLayout(typ).alignment
case *types.Array:
return TypeAlignmentInBits(typ.Element())
}
sz := TypeSizeInBits(typ)
i := 8
for i < sz {
i *= 2
}
return i
}
func checkTypeSupported(typ types.Type) {
switch typ := typ.(type) {
case *types.Int:
switch typ.Width() {
case 1, 8, 16, 32, 64:
// all good
default:
goto unsupported
}
case *types.Array:
checkTypeSupported(typ.Element())
case *types.Struct:
for _, field := range typ.Fields() {
checkTypeSupported(field)
}
}
return
unsupported:
panic(fmt.Sprintf("unsupported type: %s", typ))
}