[cfe-dev] PPCallbacks - If function param SourceRange returns whole file

[fdart via cfe-dev]

I found a solution/workaround and wanted to close the loop on this one.

The reason the string from getSourceText was not what I expected was
because the sourceRange included source locations from different files.
I'm not sure how to properly grab information in this case, but have found
a workaround.  I was able to extract the desired source information by
starting at the starting source location, and building a string up to the
first found newline character.

On Mon, Oct 7, 2019 at 9:30 AM fdart <jfdart17 at gmail.com> wrote:

> The source which I am compiling looking at does include a macro, which I
> suspect might be part of the problem.
>
> This is the file we are compiling.  PLATFORM_WINDOWS is a #define.
> #if PLATFORM_WINDOWS
> //...
> #endif
> // Other code.
>
>
>
>
> On Mon, Oct 7, 2019 at 9:25 AM fdart <jfdart17 at gmail.com> wrote:
>
>> Hi,
>>
>> In my libtooling project I have a class implementing the PPCallbacks
>> interface to get that information.  When the "If" function is triggered, I
>> am passed a condition range.  I expect that would be whatever followed "#if
>> " on that line.
>>
>> To extract the raw source text information as a string, I followed the
>> advice of the below thread and have the below implementation.  The string
>> "source" I retrieve contains the entire source of the file, after the "#if
>> " statement.  Why is that?  How can I get only the information for the text
>> on the line following the "#if "?  I'm using Clang 8.0.0.
>>
>>
>> http://clang-developers.42468.n3.nabble.com/source-code-string-from-SourceRange-td4032732.html
>>
>>
>>  void PreprocessorInfoListener::If(SourceLocation sourceLoc, SourceRange
>> conditionRange, PPCallbacks::ConditionValueKind conditionValue)
>> {
>>     LangOptions langOptions;
>>     llvm::StringRef source =
>> Lexer::getSourceText(CharSourceRange::getTokenRange(conditionRange),
>> m_sourceManager, langOptions);
>> }
>>
>> Thanks,
>> Justin
>>
>
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