annotate.js

var fs = require('fs'),
    uglify = require('uglify-js2'),
    code = fs.readFileSync('./orig.js', 'utf8');

var ast = uglify.parse(code);

// List all functions
var functions = [];
var walker = new uglify.TreeWalker(function(node){
  if (node instanceof uglify.AST_Defun) {
    functions.push(node.name.name);
  }
});
ast.walk(walker);

// Annotate all functions
var tt = new uglify.TreeTransformer(function(node, descend) {
  if (node instanceof uglify.AST_Defun) {
    var logging = new uglify.AST_SymbolConst({name: 'console.log("' + node.name.name + ' called.")'});
    node.body.unshift(logging);
  }

  descend(node, this);
  return node;
});
ast.transform(tt);

// Output annotated code.
console.log(ast.print_to_string({beautify: true}));
console.log(functions);