Merge branch 'kdoc-item2' into docs-mw

The kerneldoc parsing phase gathers all of the information about the
declarations of interest, then passes it through to the output phase as a
dict that is an unstructured blob of information; this organization has its
origins in the Perl version of the program.  It results in an interface
that is difficult to reason about, dozen-parameter function calls, and
other ills.

Introduce a new class (KdocItem) to carry this information between the
parser and the output modules, and, step by step, modify the system to use
this class in a more structured way.  This could be taken further by
creating a subclass of KdocItem for each declaration type (function,
struct, ...), but that is probably more structure than we need.

The result is (I hope) clearer code, the removal of a bunch of boilerplate,
and no changes to the generated output.

Author: Jonathan Corbet

scripts/lib/kdoc/kdoc_files.py

@@ -275,8 +275,8 @@ def msg(self, enable_lineno=False, export=False, internal=False,
                 self.config.log.warning("No kernel-doc for file %s", fname)
                 continue
 
-            for name, arg in self.results[fname]:
-                m = self.out_msg(fname, name, arg)
+            for arg in self.results[fname]:
+                m = self.out_msg(fname, arg.name, arg)
 
                 if m is None:
                     ln = arg.get("ln", 0)

scripts/lib/kdoc/kdoc_item.py

@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# A class that will, eventually, encapsulate all of the parsed data that we
+# then pass into the output modules.
+#
+
+class KdocItem:
+    def __init__(self, name, type, start_line, **other_stuff):
+        self.name = name
+        self.type = type
+        self.declaration_start_line = start_line
+        self.sections = {}
+        self.sections_start_lines = {}
+        self.parameterlist = []
+        self.parameterdesc_start_lines = []
+        self.parameterdescs = {}
+        self.parametertypes = {}
+        #
+        # Just save everything else into our own dict so that the output
+        # side can grab it directly as before.  As we move things into more
+        # structured data, this will, hopefully, fade away.
+        #
+        self.other_stuff = other_stuff
+
+    def get(self, key, default = None):
+        return self.other_stuff.get(key, default)
+
+    def __getitem__(self, key):
+        return self.get(key)
+
+    #
+    # Tracking of section and parameter information.
+    #
+    def set_sections(self, sections, start_lines):
+        self.sections = sections
+        self.section_start_lines = start_lines
+
+    def set_params(self, names, descs, types, starts):
+        self.parameterlist = names
+        self.parameterdescs = descs
+        self.parametertypes = types
+        self.parameterdesc_start_lines = starts