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https://github.com/brendankenny/call-trace
https://github.com/brendankenny/call-trace
Last synced: 3 months ago
JSON representation
- Host: GitHub
- URL: https://github.com/brendankenny/call-trace
- Owner: brendankenny
- License: apache-2.0
- Created: 2016-02-11T11:34:03.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2023-04-02T00:33:28.000Z (about 1 year ago)
- Last Synced: 2024-01-23T00:59:48.495Z (5 months ago)
- Language: JavaScript
- Size: 21.5 KB
- Stars: 32
- Watchers: 3
- Forks: 9
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Lists
- awesome-chrome-devtools - call-trace - Can instrument your JS with hooks, and then generate a `.cpuprofile` of the of the complete (non-sampled) execution. View either time or call counts. (DevTools tooling and ecosystem / CPU profile)
- awesome-github-star - call-trace
README
# call-trace.js
Instruments a JavaScript file to record its call graph and (optionally) time spent in each function. When the file is run in the browser, a trace can be converted to the Chrome CPU profile format for viewing in DevTools.
_**Super buggy and doesn't work for most fairly normal code. Don't actually use this :)**_
#### Usage:
```
./call-trace.js input.js --time > output.js
```
When the output is loaded and then run, a global variable `_$wɔk` is created containing a trace through the code you just ran.
A CPU profile can be generated from the trace:
```
copy(JSON.stringify(_$wɔk.getReport()))
```
Then save your clipboard contents and load in Chrome DevTools.
#### Exploring the data
The global variable `_$wɔk` also has the following properties:
- `file`: the full path of the original source file.
- `fns`: a list of all functions found in the file.
- `t`: a record of the call graph. Positive values represent entering a function (with the value indicating a function in `f`) and negative values represent exiting a function (with the absolute value indexing `f`).
- `d`: a record of timestamps for every entry in `t`. Only created if the `--time` option was specified.