resolve-jit-symbols

Resolves symbols for dynamic code generated by a JIT via a map file.

var resolveJITSymbols = require('resolve-jit-symbols');
var map = fs.readFileSync(__dirname + '/test/fixtures/jit.map', 'utf8')
  
var resolver = resolveJITSymbols(map);
var res = resolver.resolve('0x38852ffd485a');
console.log(res);

{ address        : '38852ffd4640',
  size           : '54c',
  decimalAddress : 62144686933568,
  symbol         : 'LazyCompile    : *go' }

Command Line

cat test/fixtures/callgraph.csv | rjs test/fixtures/jit.map

Installation

npm install resolve-jit-symbols

Usage

# Supply path to map file
cat callstack.csv | rjs /tmp/<perf-*.map>

# Or pid of process whose map file to use (resolved from /tmp/perf-<pid>.map)
cat callstack.csv | rjs <pid>

How to Generate JIT Symbol Files

Any tool that can generate the format described here will work.

With Node.js >=v0.11.15 do the following:

node --perf-basic-prof your-app.js

This will create a map file at /tmp/perf-<pid>.map.

API

generated with docme

License

MIT