Mapping bitcode to source code

Hi,

I'm looking for a way to map bitcode to the source code (C/C++) from  
which it was generated. For example, the Java class file format has an  
optional LineNumberTable attribute that maps each bytecode instruction  
to a source code line number:

http://java.sun.com/docs/books/jvms/second_edition/html/ClassFile.doc.html#22856

Is there something analogous in the LLVM environment? Thanks,

Trevor