native_client_sdk/src/examples/tutorial/debugging/example.js

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 var lastModuleError = '';
   6 var crashed = false;
   7
   8 function domContentLoaded(name, tc, config, width, height) {
   9   common.attachDefaultListeners();
  10   common.createNaClModule(name, tc, config, width, height);
  11
  12   updateStatus('Page Loaded');
  13 }
  14
  15 // Indicate success when the NaCl module has loaded.
  16 function moduleDidLoad() {
  17   updateStatus('LOADED');
  18   setTimeout(boom, 2000);
  19 }
  20
  21 function findAddress(addr, map) {
  22   if (map.length < 1) {
  23     return 'MAP Unavailable';
  24   }
  25   if (addr < map[0].offs) {
  26     return 'Invalid Address';
  27   }
  28
  29   for (var i = 1; i < map.length; i++) {
  30     if (addr < map[i].offs) {
  31       var offs = addr - map[i - 1].offs;
  32       var filename = map[i - 1].file;
  33
  34       // Force filename to 50 chars
  35       if (filename) {
  36         if (filename.length > 50) {
  37             filename = '...' + filename.substr(filename.length - 47);
  38         }
  39       } else {
  40         filename = 'Unknown';
  41       }
  42       while (filename.length < 50) {
  43         filename = ' ' + filename;
  44       }
  45       return filename + ' ' + map[i - 1].name + ' + 0x' + offs.toString(16);
  46     }
  47   }
  48
  49   var last = map.length - 1;
  50   return filename + ' ' + map[last].name + ' + 0x' + offs.toString(16);
  51 }
  52
  53 function buildTextMap(map) {
  54   // The expected format of the map file is this:
  55   // ...
  56   // .text     0x00000000000201e0     0x10e0 newlib/Debug/debugging_x86_64.o
  57   //           0x0000000000020280                layer5
  58   //           0x00000000000202e0                layer4
  59   //           0x0000000000020320                layer3
  60   //           0x0000000000020380                layer2
  61   //           0x00000000000203e0                layer1
  62   //           0x0000000000020460                NexeMain
  63   // ...
  64   var lines = map.split('\n');
  65   var orderedMap = [];
  66   var inTextSection = false;
  67   var fileName = '';
  68
  69   for (var i = 0; i < lines.length; i++) {
  70     var line = lines[i];
  71
  72     if (inTextSection) {
  73       //   <hex address>   <symbol name>
  74       var vals = line.trim().split(/\s+/);
  75       if (vals.length != 2) {
  76         inTextSection = false;
  77         continue;
  78       }
  79
  80       var obj = {
  81         offs: parseInt(vals[0], 16),
  82         name: vals[1],
  83         file: fileName
  84       };
  85
  86       orderedMap.push(obj);
  87     } else {
  88       // If line starts with .text:
  89       if (line.lastIndexOf(' .text', 0) === 0) {
  90         inTextSection = true;
  91         // .text    <hex address>   <size>  <filename>
  92         var vals = line.trim().split(/\s+/);
  93         fileName = vals[3];
  94       }
  95     }
  96   }
  97
  98   orderedMap.sort(function(a, b) { return a.offs - b.offs; });
  99   return orderedMap;
 100 }
 101
 102 function updateStack(traceinfo, map) {
 103   map = buildTextMap(map);
 104   var text = 'Stack Trace\n';
 105   for (var i = 0; i < traceinfo.frames.length; i++) {
 106     var frame = traceinfo.frames[i];
 107     var addr = findAddress(frame.prog_ctr, map);
 108     text += '[' + i.toString(10) + '] ' + addr + '\n';
 109   }
 110   document.getElementById('trace').value = text;
 111 }
 112
 113 function fetchMap(url, traceinfo) {
 114   var xmlhttp = new XMLHttpRequest();
 115   xmlhttp.open('GET', url, true);
 116   xmlhttp.onload = function() {
 117     updateStack(traceinfo, this.responseText);
 118   };
 119   xmlhttp.traceinfo = traceinfo;
 120   xmlhttp.send();
 121 }
 122
 123 // Handle a message coming from the NaCl module.
 124 function handleMessage(message_event) {
 125   msg_type = message_event.data.substring(0, 4);
 126   msg_data = message_event.data.substring(5, message_event.data.length);
 127   if (msg_type == 'LOG:') {
 128     document.getElementById('log').value += msg_data + '\n';
 129     return;
 130   }
 131   if (msg_type == 'TRC:') {
 132     crashed = true;
 133     document.getElementById('json').value = msg_data;
 134     crash_info = JSON.parse(msg_data);
 135     updateStatus('Crash Reported');
 136     src = common.naclModule.getAttribute('path');
 137     fetchMap(src + '/debugging_' + crash_info['arch'] + '.map', crash_info);
 138     return;
 139   }
 140 }
 141
 142 function updateStatus(message) {
 143   common.updateStatus(message);
 144
 145   if (message)
 146     document.getElementById('log').value += message + '\n';
 147 }
 148
 149 function boom() {
 150   if (!crashed) {
 151     updateStatus('Send BOOM');
 152     common.naclModule.postMessage('BOOM');
 153   }
 154 }