SwiftCompilationTimingParser

Whenever there is a need to automate swift compilation duration reporting, there are many ways of doing that. However, it is unclear how to achieve the best format for easier navigation in the generated reports.

SwiftCompilationTimingParser makes it easy to parse xcactivitylog logs or raw xcodebuild output, gathering timing information reported by Swift Frontend, and outputing it as a JSON file with a straightforward format.

This project is able to do the following:

1. Parse given xcactivitylog (using --derived-data-path) or xcodebuild raw output log
2. Filter compilation timing in the provided log file based on the given --threshold and --filtered-path (optional).
3. Generate JSON file with the interesting slow compiling symbols

The following xcodebuild log is expected

To generate the expected xcodebuild log (for --xcodebuild-log-path flag), the following xcodebuild invocation must be made:

    xcodebuild -workspace Project.xcworkspace \
    -scheme SchemaName \
    -sdk iphonesimulator \
    ONLY_ACTIVE_ARCH=YES \
    OTHER_SWIFT_FLAGS="-Xfrontend -debug-time-expression-type-checking \
    -Xfrontend -debug-time-function-bodies" \
    -destination 'platform=iOS Simulator,id=insert_your_simulator_id_here' clean build clean \
    | tee xcodebuild.log

Then, specify the path to xcodebuild.log file generated after this command finishes to SwiftCompilationTimingParser's --xcodebuild-log-path.

Note: running xcodebuild ... clean build clean is mandatory to achieve consistent results, but build can be also replaced by test in order to include test files into the generated report. Related issue: MobileNativeFoundation/XCLogParser#139

The following xcactivitylog is expected

In case --derived-data-path is specified instead of --xcodebuild-log-path, the following flags need to be set in project's OTHER_SWIFT_FLAGS:

-Xfrontend -debug-time-expression-type-checking
-Xfrontend -debug-time-function-bodies

The following arguments are accepted

--root-path "path_to_the_root_of_the_project_whose_log_is_parsed"
--enable-grouping
--target-name "target_name_if_xcactivitylog_is_used"
--output-path "path_to_json_file_which_would_contain_parsed_symbols"
--xcodebuild-log-path "path_to_xcodebuild_raw_log_output"
--threshold 0.4

Generated JSON format

[
  {
    "symbol" : "instance method increase(_:count:file:line:)",
    "ms" : 2.119999885559082,
    "location" : "/MyProject/Counter.swift:192:17"
  },
  {
    "symbol" : "instance method perform(_:)",
    "ms" : 0.55000001192092896,
    "location" : "/MyProject/Counter.swift:115:17"
  },
  ...
]

Usage

USAGE: swift-compilation-timing-parser --root-path <root-path> [--derived-data-path <derived-data-path>] [--xcodebuild-log-path <xcodebuild-log-path>] [--filtered-path <filtered-path>] --target-name <target-name> --threshold <threshold> --output-path <output-path> [--xcactivitylog-output-path <xcactivitylog-output-path>] [--include-invalid-loc] [--enable-grouping]

OPTIONS:
  --root-path <root-path> Absolute path to the project's root folder. Used for
                          filtering purpose to cut out the username and other
                          non-relevant paths when logs are parsed
  --derived-data-path <derived-data-path>
                          Absolute path to DerivedData, where xcactivitylog
                          will be searched
  --xcodebuild-log-path <xcodebuild-log-path>
                          Absolute path to a file with xcodebuild log output.
                          If specified, `--derived-data-path` argument is
                          ignored
  --filtered-path <filtered-path>
                          (Optional) Path which should be included during log
                          filtering. If specified, this path is the only path
                          that will appear in the results, other results will
                          be omitted
  --target-name <target-name>
                          Name of the target to be used for finding logs
  --threshold <threshold> Threshold to be used for filtering symbol compilation
                          duration
  --output-path <output-path>
                          Path where the generated contents of parsed
                          compilation duration will be stored
  --xcactivitylog-output-path <xcactivitylog-output-path>
                          Path where the parsed xcactivitylog' JSON will be
                          stored
  --include-invalid-loc   (Optional) If specified, symbols without a specific
                          location (<invalid loc>) will be included in the
                          results
  --enable-grouping       (Optional) If specified, symbols are grouped by
                          location and symbol before being written to
                          `--output-path`