On Friday, 14 October 2016 at 13:21:18 UTC, Andrei Alexandrescu wrote:
On 10/14/2016 09:20 AM, rikki cattermole wrote:
On 15/10/2016 2:17 AM, Andrei Alexandrescu wrote:
On 10/14/2016 09:15 AM, rikki cattermole wrote:
On 15/10/2016 2:13 AM, Andrei Alexandrescu wrote:
https://issues.dlang.org/show_bug.cgi?id=5051 -- Andrei


As asked for time and time again, this shouldn't be an external tool
handling it but dmd-fe should.

What is dmd-fe?

dmd front end

Yah, making the front end a library would probably be a good way to create such a tool. -- Andrei

And to enable the creation of many others.

I've looked into pluging DMD-FE inside a Vibe.d server a while ago, in order to be able to link usages to declarations (and the other way around) using a Github API.

There are a couple of things that prevented any usage of the FE as a library: - The frontend uses loads of globals and static - not only does it makes for an horrible library interface, but it makes it so that you cannot just discard the result of a semantic analysis and start over.

- DMD currently disables the GC. Enabling it causes random errors during semantic.

- All files in DMD should have to be moved to match their package definition ( explanation in https://issues.dlang.org/show_bug.cgi?id=16071 , there was also a thread on this topic a couple of weeks ago).

- The frontend depends on the backend when inline ASM is involved (and if you want to parse druntime's modules...). You can make this a soft dependency in some cases, but then the frontend just won't see your `ret` for example, so your flow control should not depend on your inline ASM.

- There were also random errors, most likely due to memory corruption, caused when compiling the frontend in (without any actual usage). For example, a global AA in Vibe.d got it's length reset.


While those issues are fixable with some effort, there doesn't seem to be any particular interest upstream towards making this work. If it is indeed a desirable direction, then maybe we could head to dmd-internals about what needs to be done, and how.

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