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POHandle C++ functions with clang API to insert code
 

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  1. POHandle C++ functions with clang API to insert code
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    <p>I need to preprocess some <strong>C++</strong> files to automatically insert code for testing and profiling, and I need to do it with the <strong>clang API</strong>. </p> <p>For now, I want to be able to do the following: If there is a function:</p> <pre><code>int SomeFn(int a, int b, int c) { doStuff(); } </code></pre> <p>I want to preprocess it, that it looks like this:</p> <pre><code>int SomeFn(int a, int b, int c) { cout &lt;&lt; "SomeFn is invoked with the following arguments: a=" &lt;&lt; a &lt;&lt; ", b=" &lt;&lt; b &lt;&lt; ", c=" &lt;&lt; c &lt;&lt; endl; doStuff(); } </code></pre> <p>I've tried to extend <code>ASTConsumer</code> and use the methods <code>HandleTopLevelDecl</code> and <code>HandleTopLevelSingleDecl</code> and check if the passed <code>Decls</code> are <code>FunctionDecls</code> and downcast them, so I can get their names and body-locations. But I can't handle class-methods that way, only global functions.</p> <p>I found a function in the <code>ASTConsumer</code> class <code>HandleTagDeclDefinition(TagDecl* D)</code>. The documentation says: </p> <blockquote> <p>This callback is invoked each time a TagDecl (e.g. struct, union, enum, class) is completed.</p> </blockquote> <p>But it looks like this method isn't even invoked, when I test it.</p> <p>So my question is, what would be the right way to do this task? And how are C++ classes are represented in the clang API? Maybe someone knows, where I can find examples because the clang API is poorly documented.</p> <hr> <p>UPDATE:</p> <p>I know there is also the concept of <code>Visitors</code> and there is a method <code>VisitRecordDecl(RecordDecl *D)</code>. The documentation says that <code>RecordDecl</code> represents classes. So I extended <code>RecursiveASTVisitor</code> and implemented <code>VisitRecordDecl(RecordDecl *D)</code> but it seems, that this method isn't invoked neither. Instead <code>VisitVarDecl</code> is invoked, when a class definition is find, as if it is seen as a variable declaration. So I'm a bit confused. I hope, someone can help...</p> <hr> <p>UPDATE2:</p> <p>I tried to parse another file and this time clang found one <code>RecordDecl</code>. But the file defined one struct and two classes, so I think my clang code parses <strong>C instead of C++</strong>. Are there any settings to <strong>switch between C and C++</strong> ?</p>
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    1. CORe "because the clang API is poorly documented." For open source software, the documentation is pretty dang good. There's a user manual in http://clang.llvm.org/docs/UsersManual.html and the API is in autogenerated by doxygen at http://clang.llvm.org/doxygen/index.html. What more could you want?
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      1. USDavid Hammen
    2. COThe manual is for the compiler, which I don't need, and the doxygen doc is helpful, if you know how clang works, but I don't.
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    3. COA non-Clang approach that might be conceptually easier to understand is outlined in this technical paper: "Branch Coverage Made Easy" http://www.semanticdesigns.com/Company/Publications/TestCoverage.pdf Branch coverage is a kind of test coverage; the paper discusses how to do profiling using the same ideas.
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