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gdb-lite and dbxgui do balloon eval slightly differently. dbxgui's logic is in EvalAnnotation. It picks lines and offsets or selections and passes them on to the engine. The dbx engine passes the info on to dbx whcih does any parsing. The gdb engine calls back to EvalAnnotation.extractExpression(). gdb-lite implements this in ToolTipAnnotation and relies on the lexer and access to the whole document.