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Re: [cdt-dev] How to extend the C99 / GCC LR Parser
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Hi Sebastian,
While extending the parser is a valid option, it will be much easier, if you manage to configure the existing parser.
Clearly, it is not possible to handle every language extension in that way, but it may work in your case.
For instance, depending on what __data16 does, I would try to map it to either 'short' or to the empty token.
To configure the existing parser you need to subclass GCCLanguage and provide a customized IScannerExtensionConfiguration and/or ICParserExtensionConfiguration.
Markus.
-----Original Message-----
From: cdt-dev-bounces@xxxxxxxxxxx [mailto:cdt-dev-bounces@xxxxxxxxxxx] On Behalf Of Sebastian Wagner
Sent: Thursday, July 07, 2011 17:11
To: cdt-dev@xxxxxxxxxxx
Subject: [cdt-dev] How to extend the C99 / GCC LR Parser
Importance: Low
Hello all,
I am working on a parser for a C based language which contains some small extensions, e.g. special type qualifiers. Therefore I would like to extend the C99 or GCC LR Parser.
I read a lot of content in the web and CDT source code. I managed to generate the Parser from the grammar file and I'm able to compile the generated files. I also understood that today the lexer is not generated using the LPG, but is a part of the preprocessor.
Now, nevertheless I didn't get the complete overview where I need to do changes if for instance I want to add a new type qualifier "__data16". Do I have to do modifications on the preprocessor and do I do that? I think keywords can be added using the ScannerExtensionConfiguration, but I don't know how to do this correctly. Do I also need to do adaptations to the AST?
It would be great if one of you could give me a short overview in which modules I need to do modifications, so that I understand the behavior better.
Thanks in advance!!
Sebastian Wagner
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