r354843 - [CGDebugInfo] Set NonTrivial DIFlag to a c++ record if it's not trivial

via cfe-commits cfe-commits at lists.llvm.org
Wed Mar 13 12:49:02 PDT 2019

Hi Aaron,
I think I am less clever than David, and it's not clear what the difference is between the two flags. In the review, Zach asked the question but I did not see a straight answer. What do these flags actually mean? What is the third state, with both flags off, implying not Trivial and not NonTrivial?  (At the very least it seems that the names could be improved.)

From: cfe-commits [mailto:cfe-commits-bounces at lists.llvm.org] On Behalf Of Aaron Smith via cfe-commits
Sent: Monday, March 04, 2019 6:22 PM
To: David Blaikie; Reid Kleckner; Adrian Prantl; Jonas Devlieghere
Cc: cfe-commits at lists.llvm.org
Subject: Re: r354843 - [CGDebugInfo] Set NonTrivial DIFlag to a c++ record if it's not trivial

Hi David, I can take a look at adding another test. Please read the code review which answers your question. A new flag is required. Thanks.

From: David Blaikie <dblaikie at gmail.com>
Sent: Tuesday, March 5, 2019 12:51:27 AM
To: Aaron Smith; Reid Kleckner; Adrian Prantl; Jonas Devlieghere
Cc: cfe-commits at lists.llvm.org
Subject: Re: r354843 - [CGDebugInfo] Set NonTrivial DIFlag to a c++ record if it's not trivial

Hi Aaron,

I don't see any mention of this in D44406 - so it might have been good to have a separate review for this (or included this in the review of D44406, which I think is possible with the monorepo).

Specifically - this change is missing test coverage (there should be a clang test that goes from C++ source code to LLVM IR & demonstrates the flag being emitted into the IR, etc).

Also - what's the reason the non-triviality can't be implied by the absence of the trivial flag? (or the other way around) - the flags seem redundant with one another.
On Mon, Feb 25, 2019 at 8:02 PM Aaron Smith via cfe-commits <cfe-commits at lists.llvm.org<mailto:cfe-commits at lists.llvm.org>> wrote:
Author: asmith
Date: Mon Feb 25 19:49:05 2019
New Revision: 354843

URL: http://llvm.org/viewvc/llvm-project?rev=354843&view=rev<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fllvm.org%2Fviewvc%2Fllvm-project%3Frev%3D354843%26view%3Drev&data=02%7C01%7Caaron.smith%40microsoft.com%7C9ee22645e4544a8a54a808d6a0b94a7a%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636873115022346268&sdata=jkLruyBw16u7MYD8G0vjNH5BAmhJbUxWM0mGPctzhxE%3D&reserved=0>
[CGDebugInfo] Set NonTrivial DIFlag to a c++ record if it's not trivial

This goes with https://reviews.llvm.org/D44406<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Freviews.llvm.org%2FD44406&data=02%7C01%7Caaron.smith%40microsoft.com%7C9ee22645e4544a8a54a808d6a0b94a7a%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636873115022346268&sdata=YBPvy0l%2BVVCzPWSXB0VYUPRS2AVHOA6pGH0sKIfM6D4%3D&reserved=0>


Modified: cfe/trunk/lib/CodeGen/CGDebugInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGDebugInfo.cpp?rev=354843&r1=354842&r2=354843&view=diff<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fllvm.org%2Fviewvc%2Fllvm-project%2Fcfe%2Ftrunk%2Flib%2FCodeGen%2FCGDebugInfo.cpp%3Frev%3D354843%26r1%3D354842%26r2%3D354843%26view%3Ddiff&data=02%7C01%7Caaron.smith%40microsoft.com%7C9ee22645e4544a8a54a808d6a0b94a7a%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636873115022356269&sdata=jkg1JEzzsmEyAfaBggFOy84iEVR%2Foqn0y%2Fj1ohXQcVk%3D&reserved=0>
--- cfe/trunk/lib/CodeGen/CGDebugInfo.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGDebugInfo.cpp Mon Feb 25 19:49:05 2019
@@ -3031,6 +3031,8 @@ llvm::DICompositeType *CGDebugInfo::Crea
     // Record if a C++ record is trivial type.
     if (CXXRD->isTrivial())
       Flags |= llvm::DINode::FlagTrivial;
+    else
+      Flags |= llvm::DINode::FlagNonTrivial;

   llvm::DICompositeType *RealDecl = DBuilder.createReplaceableCompositeType(

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