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https://github.com/brendankenny/call-trace

Last synced: 8 days ago
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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: 2024-03-01T01:50:53.000Z (8 months ago)
Last Synced: 2024-10-19T00:42:43.166Z (17 days ago)
Language: JavaScript
Size: 21.5 KB
Stars: 36
Watchers: 3
Forks: 9
Open Issues: 2
Metadata Files:
- Readme: README.md
- License: LICENSE

Awesome Lists containing this project

awesome-github-star - call-trace
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)

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.

![image](https://cloud.githubusercontent.com/assets/39191/13341642/5fa65768-dbef-11e5-8ae9-5d0896e2c895.png)

#### 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.