Code snippets resulting from macro expansion have a 0 range. Detect this first thing and return an empty snippet before starting to convert file names and reading files. For that purpose, use a CXFile instead of a QString in SourceLocation. For all other cases, output a verbose warning. Provide a function to obtain the file name from a CXFile with caching in the builder. Task-number: PYSIDE-1339 Task-number: PYSIDE-904 Change-Id: Ie30563f5b25d0d21b3a1ceb0c9da37cfc8d808dd Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Christian Tismer <tismer@stackless.com>