r255875 - Add QualType case to operator< for DynTypedNode.

[Aaron Ballman via cfe-commits]

On Thu, Dec 17, 2015 at 5:02 PM, Richard Trieu <rtrieu at google.com> wrote:
> On Thu, Dec 17, 2015 at 5:47 AM, Aaron Ballman <aaron at aaronballman.com>
> wrote:
>>
>> On Wed, Dec 16, 2015 at 11:46 PM, Richard Trieu via cfe-commits
>> <cfe-commits at lists.llvm.org> wrote:
>> > Author: rtrieu
>> > Date: Wed Dec 16 22:46:48 2015
>> > New Revision: 255875
>> >
>> > URL: http://llvm.org/viewvc/llvm-project?rev=255875&view=rev
>> > Log:
>> > Add QualType case to operator< for DynTypedNode.
>> >
>> > This allows sorting DynTypedNode's which are QualType's since QualType
>> > does
>> > not have memoization.
>> >
>> > Modified:
>> >     cfe/trunk/include/clang/AST/ASTTypeTraits.h
>> >
>> > Modified: cfe/trunk/include/clang/AST/ASTTypeTraits.h
>> > URL:
>> > http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/AST/ASTTypeTraits.h?rev=255875&r1=255874&r2=255875&view=diff
>> >
>> > ==============================================================================
>> > --- cfe/trunk/include/clang/AST/ASTTypeTraits.h (original)
>> > +++ cfe/trunk/include/clang/AST/ASTTypeTraits.h Wed Dec 16 22:46:48 2015
>> > @@ -271,6 +271,10 @@ public:
>> >      if (!NodeKind.isSame(Other.NodeKind))
>> >        return NodeKind < Other.NodeKind;
>> >
>> > +    if (ASTNodeKind::getFromNodeKind<QualType>().isSame(NodeKind))
>> > +      return getUnchecked<QualType>().getAsOpaquePtr() ==
>> > +             Other.getUnchecked<QualType>().getAsOpaquePtr();
>> > +
>>
>> This only tests for equality, not comparison, which means operator< no
>> longer has a strict weak ordering. Also, there are no tests for this
>> change.
>>
>> ~Aaron
>>
> r255929 changes the operator to '<', which should fix this.  I don't have a
> test case since the assertion was triggered in a recently checked in Clang
> Tidy test that only fails in a special configuration that I couldn't
> reproduce in a clean change.

Thank you, that commit looks much better! Couldn't we add a test in
ASTTypeTraitsTests.cpp as a unit test, or was the assert specific to
that particular special configuration?

~Aaron

>
>> >      if (ASTNodeKind::getFromNodeKind<TypeLoc>().isSame(NodeKind)) {
>> >        auto TLA = getUnchecked<TypeLoc>();
>> >        auto TLB = Other.getUnchecked<TypeLoc>();
>> >
>> >
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>
>