Walter Bright wrote:
Andrei Alexandrescu wrote:
Sketch of the safe rules:
\begin{itemize*}
\item No @cast@ from a pointer type to an integral type and vice versa
replace integral type with non-pointer type.
\item No @cast@ between unrelated pointer types
\item Bounds checks on all array accesses
\item No unions that include a reference type (array, @class@,
pointer, or @struct@ including such a type)
pointers are not a reference type. Replace "reference type" with
"pointers or reference types".
\item No pointer arithmetic
\item No escape of a pointer or reference to a local variable outside
its scope
revise: cannot take the address of a local or a reference.
\item Cross-module function calls must only go to other @safe@ modules
\end{itemize*}
add:
. no inline assembler
. no casting away of const, immutable, or shared
Ok, here's what I have now:
\begin{itemize*}
\item No @cast@ from a pointer type to a non-pointer type (e....@int@)
and vice versa
\item No @cast@ between unrelated pointer types
\item Bounds checks on all array accesses
\item No unions that include pointer type, a reference type (array,
@class@), or a @struct@ including such a type
\item No pointer arithmetic
\item Taking the address of a local is forbidden (in fact the needed
restriction is to not allow such an address to escape, but that is
more difficult to track)
\item Cross-module function calls must only go to other @safe@ modules
\item No inline assembler
\item No casting away of @const@, @immutable@, or @shared@
\end{itemize*}
Andrei
