[cfe-dev] clang ast: how do I find out whether a catch is done by const reference

[Tobias Langner]

yes, the result is the same. If someone wants a compilable example: https://github.com/iso8859-1/clang-tools-extra/tree/tobias-additional-checks <https://github.com/iso8859-1/clang-tools-extra/tree/tobias-additional-checks> (a reasonably new fork of the extra tools). The branch “tobias-additional-checks” contains the code.

Thank you
Tobias
> 
> Do you get the same results if you look at the canonical type instead?
> 
> auto QT = caughtType->getCaughtType().getCanonicalType();
> if (QT.isConstQualified() && QT->isLValueReferenceType()) ...
> 
> ~Aaron
> 
>> 
>> Regards
>> Tobias
>> 
>>   auto *type = caughtType.getTypePtr();
>>   auto *varDecl = catchStmt->getExceptionDecl();
>>   if (type->isPointerType()) {
>>     diag(varDecl->getLocStart(),
>>          "catch by const reference instead of pointer");
>>   } else if (!type->isReferenceType()) {
>>     diag(varDecl->getLocStart(), "catch by const reference");
>>   } else {
>>     if (caughtType.isConstQualified() == false) {
>>       diag(varDecl->getLocStart(),
>>            "catch by const reference to avoid unnecessary copies");
>>     }
>>   }
>> }
>> 
>> I tried looking at the varDecl but from there I can’t even find out how to
>> get the QualType. Can somebody give me a hint?
>> 
>> Regards
>> Tobias
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>> cfe-dev at cs.uiuc.edu
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