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226 lines
8.2 KiB
Python
226 lines
8.2 KiB
Python
# Copyright 2024 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import re
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import sys
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import json
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import argparse
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from elftools.elf.elffile import ELFFile
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from elftools.elf.segments import NoteSegment
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LOG_STRINGS_SECTION_NAME = ".log_strings"
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BUILD_ID_SECTION_NAME = ".note.gnu.build-id"
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BUILD_ID_NOTE_OWNER_NAME = 'GNU'
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BUILD_ID_NOTE_TYPE_NAME = 'NT_GNU_BUILD_ID'
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NEW_LOGGING_VERSION = 'NL0101'
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NEW_LOGGING_HEADER_OFFSET = 0
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LOG_LINE_SPLIT_REGEX = r'([^\0]+)\0'
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LOG_LINE_SPLIT_PATTERN = re.compile(r'([^\0]+)\0') # <anything but '\0'> followed by '\0'
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LOG_LINE_KEY_ALL_REGEX = '(?P{}.*)' # matches anything (with match group name {})
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LOG_LINE_KEY_NO_EMBEDDED_COLON_REGEX = '(?P{}[^:]*?)' # matches anything not containing a colon
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LOG_DICT_KEY_BUILD_ID_LEGACY = 'build_id'
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LOG_DICT_KEY_BUILD_ID = 'build_id_core_'
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LOG_DICT_KEY_VERSION = 'new_logging_version'
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LOG_DICT_KEY_CORE_ID = 'core_'
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LOG_CORE_ID_OFFSET_SHIFT = 30
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class LogDict:
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def __init__(self):
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self.log_dict = {}
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key_list = []
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core_id = 0
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core_id_offset = 0
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core_name = ''
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log_line_regex = None
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def parse_header_from_section(self, section):
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# Split the header string from the log strings, which follow
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header_string = section[:section.find('\0')]
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# Split the header string into parts, comma delimited
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for line in header_string.split(','):
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tag, key = line.split('=')
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if tag.startswith('NL'):
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self.log_dict[LOG_DICT_KEY_VERSION] = tag
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self.key_list = key.split(':')
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elif tag.startswith('CORE_ID'):
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self.core_id = key
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elif tag.startswith('CORE_NAME'):
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self.core_name = key
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else:
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raise Exception("Unknown header tag '{}'".format(line))
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if self.log_dict[LOG_DICT_KEY_VERSION] != NEW_LOGGING_VERSION:
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# Worthy of an exception! Something bad has happened with the tools configuration.
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raise Exception("Expected log strings version {} not {}".format(NEW_LOGGING_VERSION,
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version))
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def log_line_regex_from_key_list(self):
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regex = []
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for key in self.key_list:
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if key == '<msg>':
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regex.append(LOG_LINE_KEY_ALL_REGEX.format(key)) # Allow embedded colons
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else:
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regex.append(LOG_LINE_KEY_NO_EMBEDDED_COLON_REGEX.format(key)) # No embedded colons
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self.log_line_regex = re.compile(":".join(regex))
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def set_section_and_build_id(self, section, build_id):
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# Parse the header
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self.parse_header_from_section(section)
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# Now split the log line into a key dict using the generated regex
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self.log_line_regex_from_key_list()
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# Set the build id. If core 0, use the legacy build ID.
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# Otherwise, use the new style build ID -- append the core ID.
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if self.core_id == '0':
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self.log_dict[LOG_DICT_KEY_BUILD_ID_LEGACY] = build_id
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else:
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self.log_dict[LOG_DICT_KEY_BUILD_ID + self.core_id] = build_id
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# Set the core ID
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self.log_dict[LOG_DICT_KEY_CORE_ID + self.core_id] = self.core_name
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# Calculate the core/id offset
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self.core_id_offset = int(self.core_id) << LOG_CORE_ID_OFFSET_SHIFT
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# Create a log dictionary of line dictionaries.
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# { 'offset', { '<file>': <filename>, '<line>': <line>, '<level>': <level>, '<msg>': <msg>,
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# 'color': <color> }}
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# Stupidly, offset is now a string because JSON sucks
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# 'offset' is a decimal string.
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# First, split the section by '\0' characters, keeping track of the start.
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# There may be padding, so ignore any empty strings.
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for line in LOG_LINE_SPLIT_PATTERN.finditer(section):
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# Skip the header line
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if line.start() == NEW_LOGGING_HEADER_OFFSET:
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continue
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tags = self.log_line_regex.match(line.group(1))
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# Add the core offset to the 'offset' parameter
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self.log_dict[str(line.start() + self.core_id_offset)] = tags.groupdict()
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def get_log_dict(self):
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return self.log_dict
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def get_elf_section(filename, section_name):
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with open(filename, 'rb') as file:
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section = ELFFile(file).get_section_by_name(section_name)
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return section.data() if section is not None else None
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def get_elf_build_id(filename):
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with open(filename, 'rb') as file:
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for segment in ELFFile(file).iter_segments():
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if isinstance(segment, NoteSegment):
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for note in segment.iter_notes():
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if note['n_name'] == BUILD_ID_NOTE_OWNER_NAME and note['n_type'] == \
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BUILD_ID_NOTE_TYPE_NAME:
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return note['n_desc']
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return ''
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""" Merge two loghash dictionaries and return the union.
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The first dictionary may be empty """
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def merge_dicts(dict1, dict2):
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# Check to make sure that the versions exist and are identical
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if len(dict1) and LOG_DICT_KEY_VERSION not in dict1:
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raise Exception('First log_dict does not contain version info')
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if LOG_DICT_KEY_VERSION not in dict2:
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raise Exception('Second log_dict does not contain version info')
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if dict1[LOG_DICT_KEY_VERSION] != dict2[LOG_DICT_KEY_VERSION]:
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raise Exception('log dicts have different versions! {} != {}'.format(
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dict1[LOG_DICT_KEY_VERSION], dict2[LOG_DICT_KEY_VERSION]))
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# Check to make sure that both have core IDs and that they're different.
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core_list_dict1 = []
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for key in dict1:
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if key.startswith(LOG_DICT_KEY_CORE_ID):
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core_list_dict1.append(key)
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core_list_dict2 = []
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for key in dict2:
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if key.startswith(LOG_DICT_KEY_CORE_ID):
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core_list_dict2.append(key)
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if len(dict1) and len(core_list_dict1) == 0:
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raise Exception('First log_dict does not specify a core_id')
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if len(core_list_dict2) == 0:
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raise Exception('Second log_dict does not specify a core_id')
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intersection = set(core_list_dict1).intersection(core_list_dict2)
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if len(intersection) != 0:
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raise Exception('Both log_dicts specify the following cores: {}'.format(list(intersection)))
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# Merge the dictionaries. Don't bother confirming there are no log message conflicts.
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merged_dict = dict1.copy()
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merged_dict.update(dict2)
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return merged_dict
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""" ----------------------------- External API -------------------------------- """
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""" Returns log dict (including build_id and new_logging_version keys) from specified
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filename. Accepts either tintin_fw.elf or loghash_dict.json """
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def get_log_dict_from_file(filename):
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if filename.endswith('.json'):
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with open(filename, 'rb') as file:
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return json.load(file)
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log_strings_section = get_elf_section(filename, LOG_STRINGS_SECTION_NAME)
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build_id = get_elf_build_id(filename)
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ld = LogDict()
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ld.set_section_and_build_id(log_strings_section, build_id)
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return ld.get_log_dict()
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""" Merge the loghash_dict.json files named in 'merge_list' to node 'out_file' """
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def merge_loghash_dict_json_files(out_file, merge_list):
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out_dict = {}
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for json_file in merge_list:
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with open(json_file.abspath(), 'r') as json_file:
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in_dict = json.load(json_file)
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out_dict = merge_dicts(out_dict, in_dict)
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if LOG_DICT_KEY_BUILD_ID_LEGACY not in out_dict:
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raise Exception('build_id missing from loghash_dict.json')
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with open(out_file.abspath(), 'w') as json_file:
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json.dump(out_dict, json_file, indent=2, sort_keys=True)
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