research: MemorySanitizer or equivalent built in to debug mode

[andrewrk]

Here's an example bug #1446

This issue is to investigate MemorySanitizer and do something like it or an idea inspired by it. The idea is to detect loads and stores of undefined or otherwise invalid memory and treat them as safety violations.

Ideally the performance penalty would be small enough that we would include it in ReleaseSafe mode as well as Debug mode.

[bmeh]

Can the AddressSanitizer be used also, if you are not using it already? It would be nice to know if there's a way to know anything about both sanitizer's performance penalty in relation to Zig.

I hope it will not be included in ReleaseFast though, or at the very least one should be able to disable those completely.

[andrewrk]

It would certainly not be in ReleaseFast or ReleaseSmall builds.

I think I was actually thinking of AddressSanitizer, not MemorySanitizer, but I'll let this issue be to investigate both of them.