board_inspector: extend DSDT parser to allow parsing arbitrary trees

With AML templates for devices in the board XML, the parser now needs to be able
to parse a stream as an arbitrary object. This patch adds the `parse_tree`
method to the acpiparser.aml.parser module for this purpose.

Tracked-On: #6287
Signed-off-by: Junjie Mao <junjie.mao@intel.com>

misc/config_tools/board_inspector/acpiparser/aml/context.py

@@ -167,15 +167,20 @@ class Context:
         # Mode switches
         self.__skip_external_on_lookup = False
 
-    def switch_stream(self, filepath):
-        if not filepath in self.streams.keys():
-            with open(filepath, "rb") as f:
+    def switch_stream(self, val):
+        if isinstance(val, str):
+            if not val in self.streams.keys():
+                with open(val, "rb") as f:
                     stream = Stream(f.read())
-                self.streams[filepath] = stream
+                    self.streams[val] = stream
                     self.current_stream = stream
             else:
-            self.current_stream = self.streams[filepath]
+                self.current_stream = self.streams[val]
                 self.current_stream.reset()
+        elif isinstance(val, (bytes, bytearray)):
+            self.current_stream = Stream(val)
+        else:
+            raise NotImplementedError(f"Cannot use {val} as a stream.")
 
     def get_scope(self):
         return self.realpath(self.__current_scope, "")

misc/config_tools/board_inspector/acpiparser/dsdt.py

@@ -7,7 +7,7 @@ import os
 import logging
 
 from acpiparser.aml.stream import Stream
-from acpiparser.aml.parser import AMLCode, DeferredExpansion
+from acpiparser.aml import parser
 from acpiparser.aml.tree import Tree
 from acpiparser.aml.context import Context
 from acpiparser.aml.interpreter import ConcreteInterpreter
@@ -26,8 +26,8 @@ def DSDT(val):
             logging.info(f"Loading {t}")
             context.switch_stream(t)
             tree = Tree()
-            AMLCode.parse(context, tree)
-            tree = DeferredExpansion(context).transform(tree)
+            parser.AMLCode.parse(context, tree)
+            tree = parser.DeferredExpansion(context).transform(tree)
             context.trees[os.path.basename(t)] = tree
     except Exception as e:
         context.current_stream.dump()
@@ -38,3 +38,11 @@ def DSDT(val):
     for tree in context.trees.values():
         visitor.visit(tree)
     return context
+
+def parse_tree(label, data):
+    context = Context()
+    context.switch_stream(data)
+    tree = Tree()
+    getattr(parser, label).parse(context, tree)
+    tree = parser.DeferredExpansion(context).transform(tree)
+    return tree