Function initialize

src/memoryprofiler.js:247–317

()

  // Installs startup hook and periodic UI update timer.
  initialize() {
    // Inject the memoryprofiler hooks.
    Module['onMalloc'] = (ptr, size, loc) => emscriptenMemoryProfiler.onMalloc(ptr, size, loc);
    Module['onRealloc'] = (oldAddress, newAddress, size, loc) => emscriptenMemoryProfiler.onRealloc(oldAddress, newAddress, size, loc);;
    Module['onFree'] = (ptr) => emscriptenMemoryProfiler.onFree(ptr);
    Module['onSbrkGrow'] = (old_brk, new_brk, loc) => emscriptenMemoryProfiler.onSbrkGrow(old_brk, new_brk, loc);
    emscriptenMemoryProfiler.recordStackWatermark();

    // Add a tracking mechanism to detect when VFS loading is complete.
    Module['preRun'] ??= [];
    Module['preRun'].push(emscriptenMemoryProfiler.onPreloadComplete);

    if (emscriptenMemoryProfiler.hookStackAlloc && typeof stackAlloc == 'function') {
      // Inject stack allocator.
      var prevStackAlloc = stackAlloc;
      var hookedStackAlloc = (size) => {
        var ptr = prevStackAlloc(size);
        emscriptenMemoryProfiler.recordStackWatermark();
        return ptr;
      };
      stackAlloc = hookedStackAlloc;
    }

    if (location.search.toLowerCase().includes('trackbytes=')) {
      emscriptenMemoryProfiler.trackedCallstackMinSizeBytes = parseInt(location.search.slice(location.search.toLowerCase().indexOf('trackbytes=') + 'trackbytes='.length), undefined /* https://github.com/google/closure-compiler/issues/3230 / https://github.com/google/closure-compiler/issues/3548 */);
    }
    if (location.search.toLowerCase().includes('trackcount=')) {
      emscriptenMemoryProfiler.trackedCallstackMinAllocCount = parseInt(location.search.slice(location.search.toLowerCase().indexOf('trackcount=') + 'trackcount='.length), undefined);
    }

    emscriptenMemoryProfiler.memoryprofiler_summary = document.getElementById('memoryprofiler_summary');
    var div;
    if (!emscriptenMemoryProfiler.memoryprofiler_summary) {
      div = document.createElement("div");
      div.className = 'emscripten-memory-profiler-container';
      div.innerHTML = "<div style='border: 2px solid black; padding: 2px;'><canvas style='border: 1px solid black; margin-left: auto; margin-right: auto; display: block;' id='memoryprofiler_canvas' width='100%' height='50'></canvas><input type='checkbox' id='showHeapResizes' onclick='emscriptenMemoryProfiler.updateUi()'>Display heap and sbrk() resizes. Filter sbrk() and heap resize callstacks by keywords: <input type='text' id='sbrkFilter'>(reopen page with ?sbrkFilter=foo,bar query params to prepopulate this list)<br/>Track all allocation sites larger than <input id='memoryprofiler_min_tracked_alloc_size' type=number value="+emscriptenMemoryProfiler.trackedCallstackMinSizeBytes+"></input> bytes, and all allocation sites with more than <input id='memoryprofiler_min_tracked_alloc_count' type=number value="+emscriptenMemoryProfiler.trackedCallstackMinAllocCount+"></input> outstanding allocations. (visit this page via URL query params foo.html?trackbytes=1000&trackcount=100 to apply custom thresholds starting from page load)<br/><div id='memoryprofiler_summary'></div><input id='memoryprofiler_clear_alloc_stats' type='button' value='Clear alloc stats' ></input><br />Sort allocations by:<select id='memoryProfilerSort'><option value='bytes'>Bytes</option><option value='count'>Count</option><option value='fixed'>Fixed</option></select><div id='memoryprofiler_ptrs'></div>";
    }
    var populateHtmlBody = function() {
      if (div) {
        document.body.appendChild(div);

        function getValueOfParam(key) {
          var results = (new RegExp("[\\?&]"+key+"=([^&#]*)")).exec(location.href);
          return results ? results[1] : '';
        }
        // Allow specifying a precreated filter in page URL ?query parameters for convenience.
        if (document.getElementById('sbrkFilter').value = getValueOfParam('sbrkFilter')) {
          document.getElementById('showHeapResizes').checked = true;
        }
      }
      var self = emscriptenMemoryProfiler;
      self.memoryprofiler_summary = document.getElementById('memoryprofiler_summary');
      self.memoryprofiler_ptrs = document.getElementById('memoryprofiler_ptrs');

      document.getElementById('memoryprofiler_min_tracked_alloc_size').addEventListener("change", function(e) { self.trackedCallstackMinSizeBytes=parseInt(this.value, undefined /* https://github.com/google/closure-compiler/issues/3230 / https://github.com/google/closure-compiler/issues/3548 */); });
      document.getElementById('memoryprofiler_min_tracked_alloc_count').addEventListener("change", function(e) { self.trackedCallstackMinAllocCount=parseInt(this.value, undefined); });
      document.getElementById('memoryprofiler_clear_alloc_stats').addEventListener("click", (e) => {self.allocationsAtLoc = {}; self.allocationSitePtrs = {};});
      self.canvas = document.getElementById('memoryprofiler_canvas');