Ignoring system headers in a RecursiveASTVisitor

Clang Frontend
#1

I’m building a tool with the libtooling API - running an ASTFrontendAction with a RecursiveASTVisitor.

By default, the visitor gets run for all included files, including system headers ( and the like).

I can ignore all included files (and therefore only run on the files passed on the commandline) by overriding TraversDecl and checking

context->getSourceManager().isFromMainFile(d->getLocation());

Unfortunately, this stops me from traversing user included files. Ideally, I’d like to traverse non-system headers and ignore system headers. Is there a way to accomplish this?

Thanks!

  • Tom
#2

I believe what you need are

clang::SourceManager::isInSystemHeader
and
clang::SourceManager::isInExternCSystemHeader

The documentation has the details: http://clang.llvm.org/doxygen/classclang_1_1SourceManager.html
Basically, you need to provide them with a SourceLocation, and they will return a boolean value. The source location you can get for example using clang::SourceManager::getLocForStartOfFile, or from any AST node.