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Crashpad is a Chromium project. Most of its development practices follow Chromium’s. In order to function on its own in other projects, Crashpad uses mini_chromium, a small, self-contained library that provides many of Chromium’s useful low-level base routines. mini_chromium’s README provides more detail.
To develop Crashpad, the following tools are necessary, and must be present in the
$PATH environment variable:
The main source code repository is a Git repository hosted at https://chromium.googlesource.com/crashpad/crashpad. Although it is possible to check out this repository directly with
git clone, Crashpad’s dependencies are managed by
gclient instead of Git submodules, so to work on Crashpad, it is best to use
fetch to get the source code.
gclient are part of the depot_tools. There’s no need to install them separately.
$ mkdir ~/crashpad $ cd ~/crashpad $ fetch crashpad
fetch crashpad performs the initial
git clone and
gclient sync, establishing a fully-functional local checkout.
$ cd ~/crashpad/crashpad $ git pull -r $ gclient sync
Crashpad uses GYP to generate Ninja build files. The build is described by
.gyp files throughout the Crashpad source code tree. The
build/gyp_crashpad.py script runs GYP properly for Crashpad, and is also called when you run
gclient sync, or
The Ninja build files and build output are in the
out directory. Both debug- and release-mode configurations are available. The examples below show the debug configuration. To build and test the release configuration, substitute
Debug. On Windows, four configurations are available:
Release produce 32-bit x86 executables, and
Release_x64 produce x86_64 executables.
$ cd ~/crashpad/crashpad $ ninja -C out/Debug
Ninja is part of the depot_tools. There’s no need to install it separately.
Crashpad’s Android port is in its early stages. This build relies on cross-compilation. It’s possible to develop Crashpad for Android on any platform that the Android NDK (Native Development Kit) runs on.
If it’s not already present on your system, download the NDK package for your system and expand it to a suitable location. These instructions assume that it’s been expanded to
To build Crashpad, portions of the NDK must be reassembled into a standalone toolchain. This is a repackaged subset of the NDK suitable for cross-compiling for a single Android architecture (such as
x86_64) targeting a specific Android API level. The standalone toolchain only needs to be built from the NDK one time for each set of options desired. To build a standalone toolchain targeting 64-bit ARM and API level 21 (Android 5.0 “Lollipop”), run:
$ cd ~ $ python android-ndk-r15b/build/tools/make_standalone_toolchain.py \ --arch=arm64 --api=21 --install-dir=android-ndk-r15b_arm64_api21
Note that Chrome uses Android API level 21 for 64-bit platforms and 16 for 32-bit platforms. See Chrome’s
build/config/android/config.gni which sets
To configure a Crashpad build for Android using the standalone toolchain assembled above, use
gyp_crashpad_android.py. This script is a wrapper for
gyp_crashpad.py that sets several environment variables directing the build to the standalone toolchain, and several GYP options to identify an Android build. This must be done after any
gclient sync, or instead of any
gclient runhooks operation.
$ cd ~/crashpad/crashpad $ python build/gyp_crashpad_android.py \ --ndk ~/android-ndk-r15b_arm64_api21 \ --generator-output out/android_arm64_api21
gyp_crashpad_android.py detects the build type based on the characteristics of the standalone toolchain given in its
gyp_crashpad_android.py sets the build up to use Clang by default. It’s also possible to use GCC by providing the
--compiler=gcc argument to
The Android port is incomplete, but targets known to be working include
crashpad_util, and their tests. This list will grow over time. To build, direct
ninja to the specific
out directory chosen by the
--generator-output argument to
$ ninja -C out/android_arm64_api21/out/Debug \ crashpad_test_test crashpad_util_test
Crashpad uses Google Test as its unit-testing framework, and some tests use Google Mock as well. Its tests are currently split up into several test executables, each dedicated to testing a different component. This may change in the future. After a successful build, the test executables will be found at
$ cd ~/crashpad/crashpad $ out/Debug/crashpad_minidump_test $ out/Debug/crashpad_util_test
A script is provided to run all of Crashpad’s tests. It accepts a single argument, a path to the directory containing the test executables.
$ cd ~/crashpad/crashpad $ python build/run_tests.py out/Debug
end_to_end_test.py requires the CDB debugger, installed with Debugging Tools for Windows. This can be installed either as part of the Windows Driver Kit or the Windows SDK. If the Windows SDK has already been installed (possibly with Visual Studio) but Debugging Tools for Windows is not present, it can be installed from Add or remove programs→Windows Software Development Kit.
To test on Android, use ADB (Android Debug Bridge) to
adb push test executables and test data to a device or emulator, then use
adb shell to get a shell to run the test executables from. ADB is part of the Android SDK. Note that it is sufficient to install just the command-line tools. The entire Android Studio IDE is not necessary to obtain ADB.
This example runs
crashpad_test_test on a device. This test executable has a run-time dependency on a second executable and a test data file, which are also transferred to the device prior to running the test.
$ cd ~/crashpad/crashpad $ adb push out/android_arm64_api21/out/Debug/crashpad_test_test /data/local/tmp/ [100%] /data/local/tmp/crashpad_test_test $ adb push \ out/android_arm64_api21/out/Debug/crashpad_test_test_multiprocess_exec_test_child \ /data/local/tmp/ [100%] /data/local/tmp/crashpad_test_test_multiprocess_exec_test_child $ adb shell mkdir -p /data/local/tmp/crashpad_test_data_root/test $ adb push test/test_paths_test_data_root.txt \ /data/local/tmp/crashpad_test_data_root/test/ [100%] /data/local/tmp/crashpad_test_data_root/test/test_paths_test_data_root.txt $ adb shell device:/ $ cd /data/local/tmp device:/data/local/tmp $ CRASHPAD_TEST_DATA_ROOT=crashpad_test_data_root \ ./crashpad_test_test
Crashpad’s contribution process is very similar to Chromium’s contribution process.
A code review must be conducted for every change to Crashpad’s source code. Code review is conducted on Chromium’s Gerrit system, and all code reviews must be sent to an appropriate reviewer, with a Cc sent to crashpad-dev. The
codereview.settings file specifies this environment to
git-cl is part of the depot_tools. There’s no need to install it separately.
$ cd ~/crashpad/crashpad $ git checkout -b work_branch origin/master …do some work… $ git add … $ git commit $ git cl upload
Uploading a patch to Gerrit does not automatically request a review. You must select a reviewer on the Gerrit review page after running
git cl upload. This action notifies your reviewer of the code review request. If you have lost track of the review page,
git cl issue will remind you of its URL. Alternatively, you can request review when uploading to Gerrit by using
git cl upload --send-mail.
Git branches maintain their association with Gerrit reviews, so if you need to make changes based on review feedback, you can do so on the correct Git branch, committing your changes locally with
git commit. You can then upload a new patch set with
git cl upload and let your reviewer know you’ve addressed the feedback.
The most recently uploaded patch set on a review may be tested on a try server by running
git cl try or by clicking the “CQ Dry Run” button in Gerrit. These set the “Commit-Queue: +1” label. This does not mean that the patch will be committed, but the try server and commit queue share infrastructure and a Gerrit label. The patch will be tested on try bots in a variety of configurations. Status information will be available on Gerrit. Try server access is available to Crashpad and Chromium committers.
After code review is complete and “Code-Review: +1” has been received from all reviewers, the patch can be submitted to Crashpad’s commit queue by clicking the “Submit to CQ” button in Gerrit. This sets the “Commit-Queue: +2” label, which tests the patch on the try server before landing it. Commit queue access is available to Crashpad and Chromium committers.
Although the commit queue is recommended, if needed, project members can bypass the commit queue and land patches without testing by using the “Submit” button in Gerrit or by committing via
git cl land:
$ cd ~/crashpad/crashpad $ git checkout work_branch $ git cl land
Copyright holders must complete the Individual Contributor License Agreement or Corporate Contributor License Agreement as appropriate before any submission can be accepted, and must be listed in the
AUTHORS file. Contributors may be listed in the
The Crashpad Buildbot performs automated builds and tests of Crashpad. Before checking out or updating the Crashpad source code, and after checking in a new change, it is prudent to check the Buildbot to ensure that “the tree is green.”