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3b28c72142
Works at least on a CentOS 7 machine after running `sudo yum install
webkitgtk webkitgtk-devel`.
The only globals you get are `print` and `PerfCounters`. No `console` nor the other globals provided by the `jsc` command-line tool (load, readFile, etc) though they're probably not hard to implement.
You can disable the JIT by setting the environment variable `JSC_useJIT=false`.
Test Plan:
```
~/local/react/scripts/perf-counters$ make
~/local/react/scripts/perf-counters$ build/jsc-perf <(echo 'PerfCounters.init(); var a = PerfCounters.getCounters().instructions; print("moo"); var b = PerfCounters.getCounters().instructions; print(b - a);')
moo
72182
~/local/react/scripts/perf-counters$
```
perf-counters
Lightweight bindings to Linux perf event counters.
$ node
> var PerfCounters = require('perf-counters');
> PerfCounters.init();
> var start = PerfCounters.getCounters(); console.log('test'); var end = PerfCounters.getCounters();
test
> start
{ instructions: 1382, loads: 421, stores: 309 }
> end
{ instructions: 647633, loads: 195771, stores: 133246 }
>