[cfe-dev] libclang's Indexer assertion on translation unit in large C++ codebase

[Daniel Jennings]

I preprocessed the file using VS2008 (which is what we compile our projects
in naturally) and ran that through libclang's indexer and got a different
assertion:

Program: c:\Python27-32\python.exe
File: E:\llvm\include\llvm/Support/Casting.h
Line: 194
Expression: isa<X>(Val) && "cast<Ty>() argument of incompatible type!"

Unfortunately the preprocessed file is 740kb, which isn't very usable when
it comes to figuring out what's going on in the file, so I might have to try
a different project and trim it down as much as possible, which might be
difficult, to figure it out.

On Thu, Aug 25, 2011 at 4:06 PM, Daniel Jennings <sekkusu at gmail.com> wrote:

> I'll try preprocessing the file before running it through the parser to see
> if I can reproduce it.
>
> Thanks for the help!
>
>
> On Thu, Aug 25, 2011 at 4:04 PM, Douglas Gregor <dgregor at apple.com> wrote:
>
>>
>> On Aug 25, 2011, at 3:48 PM, Daniel Jennings wrote:
>>
>> > Hi all,
>> >
>> > I'm currently trying to run libclang's indexer over parts of an existing
>> (large) codebase (that has never seen clang before) in order to run some
>> metrics. I've got it working for some scenarios but in the process of
>> getting it working I've run into a failed assertion in clang's AST code that
>> I'm not sure how to track down. This problem only seems to exist when I try
>> to run the indexer over parts of the real codebase; simple test CPP files
>> work fine. As you'll see by the message, I'm using the python bindings for
>> libclang, and I have my own locally built libclang.dll built under VS2010.
>> >
>> > Program: c:\Python27-32\python.exe
>> > File: E:\llvm\tools\clang\include\clang/AST/DeclCXX.h
>> > Line: 522
>> > Expression: DefinitionData && "queried property of class with no
>> definition"
>> >
>> > and
>> >
>> > libclang: crash detected during parsing: {
>> >   'source_filename' : '(null)'
>> >   'command_line_args' : ['u:\Code\Services\MyService\MyService.cpp'],
>> >   'unsaved_files' : [],
>> >   'options' : 0,
>> > }
>> >
>> >
>> > I'm not entirely sure how to track this down and figure out if I'm doing
>> something wrong. I'm just trying to run the indexer over a single
>> translation unit (a single CPP file) but that CPP file includes all of our
>> normal core headers, etc. which I think may be the problem. By this point
>> I'm very familiar with how the Python bindings work/wrap the libclang code,
>> and I have my IDE set up for working with libclang code, so if you need me
>> to poke around or add some sort of diagnostic code I can.
>>
>> This looks like Clang crashing during parsing. Can you reproduce the
>> problem with preprocessed input? If so, please open a bug report so we can
>> track down the issue.
>>
>>        - Doug
>>
>>
>
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