Segmentation fault in DMD - how to debug?

[ryuukk_]

On Tuesday, 4 October 2022 at 10:10:35 UTC, Dennis wrote:
> On Tuesday, 4 October 2022 at 02:13:16 UTC, Walter Bright wrote:
>> grep reveals:
>>
>> https://github.com/dlang/dmd/pull/14517
>
> I have a few more :)
>
> The backend has 4 calls to `util_malloc`, 28 calls to 
> `mem_malloc`, 2 calls to `mem_malloc2`, 8 calls to 
> `mem_fmalloc` (why so many `malloc` wrappers?), and 16 calls to 
> `mem_calloc`. I don't see any checks on those.
>
> Here's one with plain `malloc`:
>
> dmd/backend/dcgcv.d:264
> ```
> d = cast(debtyp_t *) malloc(debtyp_t.sizeof - (d.data).sizeof + 
> length);
> d.length = cast(ushort)length;
> ```
>
> This one checks, but after memcpy'ing to `null`!
>
> dmd/common/file.d:148
> ```
> name = cast(char*) memcpy(malloc(totalNameLength), filename, 
> totalNameLength);
> name || assert(0, "FileMapping: Out of memory.");
> ```

Another case for a proper allocator API in the std!