1 --- 2 title: 'SAOC LLDB D integration: 7th Weekly Update' 3 date: '2021-11-04T01:39:00+01:00' 4 tags: ['saoc', 'saoc2021', 'dlang', 'llvm', 'lldb', 'debug', 'debugging', 'dwarf'] 5 description: "This post describes what I've done on the 7th week of the 6 Symmetry Autumn of Code 2021, including updates on the LLVM patches, various 7 fixes and refactors in the compiler and some more issues found." 8 --- 9 10 Hi D community! 11 12 I'm here again, to describe what I've done during the seventh week of Symmetry 13 Autumn of Code. 14 15 ## LLVM/LLDB upstream status update 16 17 Some trivial changes about LLDB plugins got merged and a fix got raised after 18 my investigation on https://bugs.llvm.org/show_bug.cgi?id=45856 . 19 20 I have some fresh news about the demangler being upstreamed. It appears that 21 approval from official foundation members is not going forward, as expected. At 22 this point, most of the code from libiberty got changed, at least on the first 23 patches. This is unfortunate, but I'm going to do my best to push this forward. 24 I have some experience with D demangling, so making a clean room implementation 25 is not big of a deal, it is just time consuming. 26 27 Some of my considerations on this is to try to contact every single contributor 28 in d-demangler.c file, which is roughly 5 contributors, but I still need to 29 coordinate this with them and my mentor for the best option. 30 31 About the D plugin for LLDB, I also got news. They seems to accept new language 32 plugins as long as there is enough maintainers. If someone wants to volunteer 33 to co-maintain it, I would appreciate. 34 35 ## DWARF Abbreviation refactor 36 37 I pushed the refactor I was working on in the past week. You can find more 38 about it here: https://github.com/dlang/dmd/pull/13237 . I'm probably going to 39 freeze this until I fix the other issues that have much more priority and work 40 on this when DWARF behaviour is more consistent. 41 42 During the refactor I accidentally discovered a double free after rebasing with 43 andrea's change and reported some ASAN issues I found suitable to report: 44 45 - https://issues.dlang.org/show_bug.cgi?id=22450 46 - https://issues.dlang.org/show_bug.cgi?id=22451 47 - https://issues.dlang.org/show_bug.cgi?id=22452 48 49 ## Fixed issues 50 51 ### Delegates are now distinguishable 52 53 Previously, delegates was being generated with `_Delegate` naming and now they 54 use the qualified name of the type, being something similar to `void delegate() 55 @nogc`. You can find the patch and the associated issue here: 56 57 - https://issues.dlang.org/show_bug.cgi?id=22459 58 - https://github.com/dlang/dmd/pull/13241 59 60 ### wchar_t reports incorrect DECL attributes 61 62 When a `wchar` is used, the typedef generated by the compiler reports a dummy 63 filename and line declarations. I fixed this on: 64 - https://github.com/dlang/dmd/pull/13247 65 - https://issues.dlang.org/show_bug.cgi?id=22467 66 67 ### dchar encoding is missing 68 69 When using `dchar` type, encoding is not correctly reported as UTF and 70 debuggers like LLDB doesn't show it properly. I fixed it on: 71 - https://issues.dlang.org/show_bug.cgi?id=22468 72 - https://github.com/dlang/dmd/pull/13254 73 74 During these various fixes, I ended up making the following trivial minor 75 patches: 76 77 - https://github.com/dlang/dmd/pull/13240 78 - https://github.com/dlang/dmd/pull/13239 79 - https://github.com/dlang/dmd/pull/13246 80 81 ## Other reported issues 82 83 I also reported the following issues that I'll consider fixing next week: 84 85 - https://issues.dlang.org/show_bug.cgi?id=22469 86 - https://issues.dlang.org/show_bug.cgi?id=22471 87 88 ## What is next? 89 90 I didn't have much time this week to make all the tasks I wanted to do, which 91 was primarily fixing the compiler related issues. I'm currently in a conference 92 and my productive is limited. I hope next week I can do a bit more stuff and 93 hopefully fix most of the issues I have in mind to homogenize the DWARF 94 generation. 95 96 You can also read this on the D programming language forum, 97 [here](https://forum.dlang.org/thread/[email protected]), 98 and discuss there. 99 100 Read about the [previous week](../d-saoc-2021-06/) and the [next 101 week](../d-saoc-2021-08/).