Clang libtooling: determine macro expansion location

Question

I have a header header.h with a macro definition which expands into a class definition and a source file test.cpp which includes header.h and uses this macro. Then I use RecursiveASTVisitor to visit all CXXRecordDecl's.

When I visit the CXXRecordDecl which is expansion of the macro (in test.cpp) and query for its SourceLocation and dump() it, the location points to header.h - the location of macro definition.

What I need to get for this CXXRecordDecl is the SourceLocation of macro expansion - in my case it should be test.cpp.

Thanks in advance.

score 5 · Accepted Answer · answered Sep 22 '15 at 16:24

Found solution.

The required method is SourceManager's getFileLoc(SourceLocation loc), which "returns the expansion location" if loc "is a macro location".

My code to get source location for both normal class definitions and definitions as macro expansions:

bool VisitCXXRecordDecl(CXXRecordDecl* record)
{
    SourceLocation loc = record->getLocStart();
    SourceLocation locExp = m_sourceManager.getFileLoc(loc);
    // if record is a macro expansion in test.cpp, locExp points to test.cpp
    // if record is not a macro expansion, locExp correctly points to matching source file
}

Clang libtooling: determine macro expansion location

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