Chrome Android Dependency Analysis Tool

Overview

As part of Chrome Modularization, this directory contains various tools for analyzing the dependencies contained within the Chrome Android project.

Usage

Start by generating a JSON dependency file with a snapshot of the dependencies for your JAR files using the JSON dependency generator command-line tool.

This snapshot file can then be used as input for various other analysis tools listed below.

Command-line tools

The usage information for any of the following tools is also accessible via toolname -h or toolname --help.

JSON Dependency Generator

Runs jdeps (dependency analysis tool) on all JARs a root build target depends on and writes the resulting dependency graph into a JSON file. The default root build target is chrome/android:monochrome_public_bundle.

usage: generate_json_dependency_graph.py [-h] -C BUILD_OUTPUT_DIR -o OUTPUT
                                         [-t TARGET] [-j JDEPS_PATH]

optional arguments:
  -t TARGET, --target TARGET
                        Root build target.
  -j JDEPS_PATH, --jdeps-path JDEPS_PATH
                        Path to the jdeps executable.

required arguments:
  -C BUILD_OUTPUT_DIR, --build_output_dir BUILD_OUTPUT_DIR
                        Build output directory.
  -o OUTPUT, --output OUTPUT
                        Path to the file to write JSON output to. Will be
                        created if it does not yet exist and overwrite
                        existing content if it does.

Class Dependency Audit

Given a JSON dependency graph, output the class-level dependencies for a given list of classes.

An example is given at the end of this page. To see the options:

tools/android/dependency_analysis/print_class_dependencies.py -h

Package Dependency Audit

Given a JSON dependency graph, output the package-level dependencies for a given package and the class dependencies comprising those dependencies.

An example is given at the end of this page. To see the options:

tools/android/dependency_analysis/print_package_dependencies.py -h

Package Cycle Counting

Given a JSON dependency graph, counts package cycles up to a given size.

To see the options:

tools/android/dependency_analysis/count_cycles.py -h

Example Usage

This Linux example assumes Chromium is contained in a directory ~/cr and that Chromium has been built as per the instructions here, although the only things these assumptions affect are the file paths.

$ tools/android/dependency_analysis/generate_json_dependency_graph.py -C out/Debug -o ~/graph.json
>>> Running jdeps and parsing output...
>>> Parsed class-level dependency graph, got 3239 nodes and 19272 edges.
>>> Created package-level dependency graph, got 500 nodes and 4954 edges.
>>> Dumping JSON representation to ~/graph.json.

tools/android/dependency_analysis/print_class_dependencies.py -f ~/graph.json -c AppHooks
>>> Printing class dependencies for org.chromium.chrome.browser.AppHooks:
>>> 35 inbound dependency(ies) for org.chromium.chrome.browser.AppHooks:
>>> 	org.chromium.chrome.browser.AppHooksImpl
>>> 	org.chromium.chrome.browser.ChromeActivity
>>> ...

tools/android/dependency_analysis/print_package_dependencies.py -f ~/graph.json -p chrome.browser
>>> Printing package dependencies for org.chromium.chrome.browser:
>>> 121 inbound dependency(ies) for org.chromium.chrome.browser:
>>> 	org.chromium.chrome.browser.about_settings -> org.chromium.chrome.browser
>>> 	1 class edge(s) comprising the dependency:
>>> 		AboutChromeSettings -> ChromeVersionInfo
>>> ...