external/ton
1
0
Fork 0
mirror of https://github.com/ton-blockchain/ton synced 2025-03-09 15:40:10 +00:00
Code Issues Releases Wiki Activity

[Tolk] Nullable types T? and null safety

Browse source 
This commit introduces nullable types `T?` that are
distinct from non-nullable `T`.
Example: `int?` (int or null) and `int` are different now.
Previously, `null` could be assigned to any primitive type.
Now, it can be assigned only to `T?`.

A non-null assertion operator `!` was also introduced,
similar to `!` in TypeScript and `!!` in Kotlin.

If `int?` still occupies 1 stack slot, `(int,int)?` and
other nullable tensors occupy N+1 slots, the last for
"null precedence". `v == null` actually compares that slot.
Assigning `(int,int)` to `(int,int)?` implicitly creates
a null presence slot. Assigning `null` to `(int,int)?` widens
this null value to 3 slots. This is called "type transitioning".

All stdlib functions prototypes have been updated to reflect
whether they return/accept a nullable or a strict value.

This commit also contains refactoring from `const FunctionData*`
to `FunctionPtr` and similar.
This commit is contained in:
tolk-vm 2025-02-24 20:13:36 +03:00
parent 1389ff6789
commit f3e620f48c
No known key found for this signature in database
GPG key ID: 7905DD7FE0324B12
62 changed files with 2031 additions and 702 deletions
Download patch file Download diff file Expand all files Collapse all files

2
tolk/constant-evaluator.cpp
View file

@ -255,7 +255,7 @@ struct ConstantEvaluator {
if (!sym) {
v->error("undefined symbol `" + static_cast<std::string>(name) + "`");
}
const GlobalConstData* const_ref = sym->try_as<GlobalConstData>();
GlobalConstPtr const_ref = sym->try_as<GlobalConstPtr>();
if (!const_ref) {
v->error("symbol `" + static_cast<std::string>(name) + "` is not a constant");
}