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javascript backtrace function

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  1. /* <![CDATA[ */
  2.   function printStackTrace() {
  3. 	  var callstack = [];
  4. 	  var isCallstackPopulated = false;
  5. 	  try {
  6. 	    i.dont.exist+=0; //doesn't exist- that's the point
  7. 	  } catch(e) {
  8. 	    if (e.stack) { //Firefox
  9. 	      var lines = e.stack.split("\n");
  10. 	      for (var i=0, len=lines.length; i<len; i++) {
  11. 	        if (lines[i].match(/^\s*[A-Za-z0-9\-_\$]+\(/)) {
  12. 	          callstack.push(lines[i]);
  13. 	        }
  14. 	      }
  15. 	      //Remove call to printStackTrace()
  16. 	      callstack.shift();
  17. 	      isCallstackPopulated = true;
  18. 	    }
  19. 	    else if (window.opera && e.message) { //Opera
  20. 	      var lines = e.message.split("\n");
  21. 	      for (var i=0, len=lines.length; i<len; i++) {
  22. 	        if (lines[i].match(/^\s*[A-Za-z0-9\-_\$]+\(/)) {
  23. 	          var entry = lines[i];
  24. 	          //Append next line also since it has the file info
  25. 	          if (lines[i+1]) {
  26. 	            entry += " at " + lines[i+1];
  27. 	            i++;
  28. 	          }
  29. 	          callstack.push(entry);
  30. 	        }
  31. 	      }
  32. 	      //Remove call to printStackTrace()
  33. 	      callstack.shift();
  34. 	      isCallstackPopulated = true;
  35. 	    }
  36. 	  }
  37. 	  if (!isCallstackPopulated) { //IE and Safari
  38. 	    var currentFunction = arguments.callee.caller;
  39. 	    while (currentFunction) {
  40. 	      var fn = currentFunction.toString();
  41. 	      var fname = fn.substring(fn.indexOf("function") + 8, fn.indexOf("(")) || "anonymous";
  42. 	      callstack.push(fname);
  43. 	      currentFunction = currentFunction.caller;
  44. 	    }
  45. 	  }
  46. 	  output(callstack);
  47. 	}
  48.  
  49. 	function output(arr) {
  50. 	  //Output whatever you want
  51. 	  console.info('stack trace', arr.join("nn"));
  52. 	}
  53.  
  54. /* ]]> */

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