[cdt-dev] adding a new language to the CDT

[Michael Rosenfelder <MROSENFE@xxxxxxxxxx>]

Hi,
I'm working on an Eclipse Plug-In to
support a procedural programming language called PL8, a PL/I variant for
systems programming. We have PL8 and C source files in one source tree
(project). Our compiler builds all files to object files and then they
are linked together to one binary. It is possible to call a C-function
from a PL8-function and vice versa. So our idea was to use the CDT and
treat the source tree as a C/C++ project. The C/C++ files will be handled
by CDT and the PL8 files are handled by a PL8 editor (Syntax highlighting,
outline view). We also want to use the code navigation feature in the PL8
context. Therefore our idea was to add some informations like function
definitions in the C-index. We created a Java class PL8Language implementing
the ILanguage interface from the ILanguage Extension Point of the CDT.
The parser of the PL8 should not create an own index, but should add the
functions of PL8 language to the index, created by the CDT-Parser. 
If I click e.g. on a PL8-function in
a C-file, the C-indexer searches for the function in the now combined index
for the location of the function and jumps to it. If I click in a PL8-file,
my own indexer searchs for the function in the combined index.

I think the solution is to implement
the getASTTranslationUnit and my own ModelBuilder.
I tried to implement the getASTTranslationUnit
in this way.

public IASTTranslationUnit getASTTranslationUnit(CodeReader
reader,
         
              IScannerInfo
scanInfo, ICodeReaderFactory fileCreator,
         
              IIndex
index, IParserLogService log) throws CoreException {
         
      System.out.println("PL8Language::getASTTranslationUnit");
         
      final ISourceCodeParser parser= new PL8SourceCodeParser(index);
         
      // Parse
         
      IASTTranslationUnit ast= parser.parse();
         
      return ast;
         
      
        }

The parse function of my SourceCodeParser
looks like the following:

public IASTTranslationUnit parse()
{
         
      System.out.println("PL8SourceCodeParser::parse");
         
      IASTTranslationUnit result;
         
      //Create a new TranslationUnit
         
      translationUnit = new CASTTranslationUnit();
         
      translationUnit.setOffset(0);
         
      translationUnit.setIndex(index);
         
      
         
      //Name of the function
         
      char name_str[] = {'A', 'B'};
         
      CASTName declaratorName = new CASTName(name_str);
        
         
      //new SimpleDeclaration
         
      IASTSimpleDeclaration declaration = new CASTSimpleDeclaration();
         
      
         
      IASTStandardFunctionDeclarator declarator
= new CASTFunctionDeclarator(declaratorName);
         
      declaration.addDeclarator(declarator);
         
      
         
      CASTSimpleDeclSpecifier declSpec = new CASTSimpleDeclSpecifier();
         
      declaration.setDeclSpecifier(declSpec);
         
      
         
      translationUnit.addDeclaration(declaration);
        
         
      result = translationUnit;
         
      translationUnit = null;
         
      
         
      return result;
        }

The goal is to add a function AB to
the index. But the current situation is different. There is no function
with the name AB in the index and at the moment I had no idea what the
reason is. The return value of the parse function is the right one. The
return value has the function included.
At the moment I found no other way
to write into the index, which is used for the source code navigation.

I also searched for a solution in the
CDT Wiki in the topic Design. It is clearly explained about the CDT works,
but no explanation how I can implement my idea.

So my question to you, where is my
mistake or is it generally possible to implement my idea? 
Is there anything additional I have
to do or can you point me to an example ?

Thank you in advance!

Kind regards

Michael