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HeapSnapshot.js
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HeapSnapshot.js
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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @constructor
*/
WebInspector.HeapSnapshotArraySlice = function(array, start, end)
{
this._array = array;
this._start = start;
this.length = end - start;
}
WebInspector.HeapSnapshotArraySlice.prototype = {
item: function(index)
{
return this._array[this._start + index];
},
slice: function(start, end)
{
if (typeof end === "undefined")
end = this.length;
return this._array.subarray(this._start + start, this._start + end);
}
}
/**
* @constructor
* @param {number=} edgeIndex
*/
WebInspector.HeapSnapshotEdge = function(snapshot, edges, edgeIndex)
{
this._snapshot = snapshot;
this._edges = edges;
this.edgeIndex = edgeIndex || 0;
}
WebInspector.HeapSnapshotEdge.prototype = {
clone: function()
{
return new WebInspector.HeapSnapshotEdge(this._snapshot, this._edges, this.edgeIndex);
},
hasStringName: function()
{
if (!this.isShortcut())
return this._hasStringName();
return isNaN(parseInt(this._name(), 10));
},
isElement: function()
{
return this._type() === this._snapshot._edgeElementType;
},
isHidden: function()
{
return this._type() === this._snapshot._edgeHiddenType;
},
isWeak: function()
{
return this._type() === this._snapshot._edgeWeakType;
},
isInternal: function()
{
return this._type() === this._snapshot._edgeInternalType;
},
isInvisible: function()
{
return this._type() === this._snapshot._edgeInvisibleType;
},
isShortcut: function()
{
return this._type() === this._snapshot._edgeShortcutType;
},
name: function()
{
if (!this.isShortcut())
return this._name();
var numName = parseInt(this._name(), 10);
return isNaN(numName) ? this._name() : numName;
},
node: function()
{
return new WebInspector.HeapSnapshotNode(this._snapshot, this.nodeIndex());
},
nodeIndex: function()
{
return this._edges.item(this.edgeIndex + this._snapshot._edgeToNodeOffset);
},
rawEdges: function()
{
return this._edges;
},
toString: function()
{
var name = this.name();
switch (this.type()) {
case "context": return "->" + name;
case "element": return "[" + name + "]";
case "weak": return "[[" + name + "]]";
case "property":
return name.indexOf(" ") === -1 ? "." + name : "[\"" + name + "\"]";
case "shortcut":
if (typeof name === "string")
return name.indexOf(" ") === -1 ? "." + name : "[\"" + name + "\"]";
else
return "[" + name + "]";
case "internal":
case "hidden":
case "invisible":
return "{" + name + "}";
};
return "?" + name + "?";
},
type: function()
{
return this._snapshot._edgeTypes[this._type()];
},
_hasStringName: function()
{
return !this.isElement() && !this.isHidden() && !this.isWeak();
},
_name: function()
{
return this._hasStringName() ? this._snapshot._strings[this._nameOrIndex()] : this._nameOrIndex();
},
_nameOrIndex: function()
{
return this._edges.item(this.edgeIndex + this._snapshot._edgeNameOffset);
},
_type: function()
{
return this._edges.item(this.edgeIndex + this._snapshot._edgeTypeOffset);
}
};
/**
* @constructor
*/
WebInspector.HeapSnapshotEdgeIterator = function(edge)
{
this.edge = edge;
}
WebInspector.HeapSnapshotEdgeIterator.prototype = {
first: function()
{
this.edge.edgeIndex = 0;
},
hasNext: function()
{
return this.edge.edgeIndex < this.edge._edges.length;
},
index: function()
{
return this.edge.edgeIndex;
},
setIndex: function(newIndex)
{
this.edge.edgeIndex = newIndex;
},
item: function()
{
return this.edge;
},
next: function()
{
this.edge.edgeIndex += this.edge._snapshot._edgeFieldsCount;
}
};
/**
* @constructor
*/
WebInspector.HeapSnapshotRetainerEdge = function(snapshot, retainedNodeIndex, retainerIndex)
{
this._snapshot = snapshot;
this._retainedNodeIndex = retainedNodeIndex;
var retainedNodeOrdinal = retainedNodeIndex / snapshot._nodeFieldCount;
this._firstRetainer = snapshot._firstRetainerIndex[retainedNodeOrdinal];
this._retainersCount = snapshot._firstRetainerIndex[retainedNodeOrdinal + 1] - this._firstRetainer;
this.setRetainerIndex(retainerIndex);
}
WebInspector.HeapSnapshotRetainerEdge.prototype = {
clone: function()
{
return new WebInspector.HeapSnapshotRetainerEdge(this._snapshot, this._retainedNodeIndex, this.retainerIndex());
},
hasStringName: function()
{
return this._edge().hasStringName();
},
isElement: function()
{
return this._edge().isElement();
},
isHidden: function()
{
return this._edge().isHidden();
},
isInternal: function()
{
return this._edge().isInternal();
},
isInvisible: function()
{
return this._edge().isInvisible();
},
isShortcut: function()
{
return this._edge().isShortcut();
},
isWeak: function()
{
return this._edge().isWeak();
},
name: function()
{
return this._edge().name();
},
node: function()
{
return this._node();
},
nodeIndex: function()
{
return this._nodeIndex;
},
retainerIndex: function()
{
return this._retainerIndex;
},
setRetainerIndex: function(newIndex)
{
if (newIndex !== this._retainerIndex) {
this._retainerIndex = newIndex;
this.edgeIndex = newIndex;
}
},
set edgeIndex(edgeIndex)
{
var retainerIndex = this._firstRetainer + edgeIndex;
this._globalEdgeIndex = this._snapshot._retainingEdges[retainerIndex];
this._nodeIndex = this._snapshot._retainingNodes[retainerIndex];
delete this._edgeInstance;
delete this._nodeInstance;
},
_node: function()
{
if (!this._nodeInstance)
this._nodeInstance = new WebInspector.HeapSnapshotNode(this._snapshot, this._nodeIndex);
return this._nodeInstance;
},
_edge: function()
{
if (!this._edgeInstance) {
var edgeIndex = this._globalEdgeIndex - this._node()._edgeIndexesStart();
this._edgeInstance = new WebInspector.HeapSnapshotEdge(this._snapshot, this._node().rawEdges(), edgeIndex);
}
return this._edgeInstance;
},
toString: function()
{
return this._edge().toString();
},
type: function()
{
return this._edge().type();
}
}
/**
* @constructor
*/
WebInspector.HeapSnapshotRetainerEdgeIterator = function(retainer)
{
this.retainer = retainer;
}
WebInspector.HeapSnapshotRetainerEdgeIterator.prototype = {
first: function()
{
this.retainer.setRetainerIndex(0);
},
hasNext: function()
{
return this.retainer.retainerIndex() < this.retainer._retainersCount;
},
index: function()
{
return this.retainer.retainerIndex();
},
setIndex: function(newIndex)
{
this.retainer.setRetainerIndex(newIndex);
},
item: function()
{
return this.retainer;
},
next: function()
{
this.retainer.setRetainerIndex(this.retainer.retainerIndex() + 1);
}
};
/**
* @constructor
* @param {number=} nodeIndex
*/
WebInspector.HeapSnapshotNode = function(snapshot, nodeIndex)
{
this._snapshot = snapshot;
this._firstNodeIndex = nodeIndex;
this.nodeIndex = nodeIndex;
}
WebInspector.HeapSnapshotNode.prototype = {
canBeQueried: function()
{
var flags = this._snapshot._flagsOfNode(this);
return !!(flags & this._snapshot._nodeFlags.canBeQueried);
},
isPageObject: function()
{
var flags = this._snapshot._flagsOfNode(this);
return !!(flags & this._snapshot._nodeFlags.pageObject);
},
distanceToWindow: function()
{
return this._snapshot._distancesToWindow[this.nodeIndex / this._snapshot._nodeFieldCount];
},
className: function()
{
var type = this.type();
switch (type) {
case "hidden":
return WebInspector.UIString("(system)");
case "object":
case "native":
return this.name();
case "code":
return WebInspector.UIString("(compiled code)");
default:
return "(" + type + ")";
}
},
classIndex: function()
{
var snapshot = this._snapshot;
var nodes = snapshot._nodes;
var type = nodes[this.nodeIndex + snapshot._nodeTypeOffset];;
if (type === snapshot._nodeObjectType || type === snapshot._nodeNativeType)
return nodes[this.nodeIndex + snapshot._nodeNameOffset];
return -1 - type;
},
dominatorIndex: function()
{
var nodeFieldCount = this._snapshot._nodeFieldCount;
return this._snapshot._dominatorsTree[this.nodeIndex / this._snapshot._nodeFieldCount] * nodeFieldCount;
},
edges: function()
{
return new WebInspector.HeapSnapshotEdgeIterator(new WebInspector.HeapSnapshotEdge(this._snapshot, this.rawEdges()));
},
edgesCount: function()
{
return (this._edgeIndexesEnd() - this._edgeIndexesStart()) / this._snapshot._edgeFieldsCount;
},
flags: function()
{
return this._snapshot._flagsOfNode(this);
},
id: function()
{
var snapshot = this._snapshot;
return snapshot._nodes[this.nodeIndex + snapshot._nodeIdOffset];
},
isHidden: function()
{
return this._type() === this._snapshot._nodeHiddenType;
},
isNative: function()
{
return this._type() === this._snapshot._nodeNativeType;
},
isSynthetic: function()
{
return this._type() === this._snapshot._nodeSyntheticType;
},
isWindow: function()
{
const windowRE = /^Window/;
return windowRE.test(this.name());
},
isDetachedDOMTreesRoot: function()
{
return this.name() === "(Detached DOM trees)";
},
isDetachedDOMTree: function()
{
const detachedDOMTreeRE = /^Detached DOM tree/;
return detachedDOMTreeRE.test(this.className());
},
isRoot: function()
{
return this.nodeIndex === this._snapshot._rootNodeIndex;
},
name: function()
{
return this._snapshot._strings[this._name()];
},
rawEdges: function()
{
return new WebInspector.HeapSnapshotArraySlice(this._snapshot._containmentEdges, this._edgeIndexesStart(), this._edgeIndexesEnd());
},
retainedSize: function()
{
var snapshot = this._snapshot;
return snapshot._nodes[this.nodeIndex + snapshot._nodeRetainedSizeOffset];
},
retainers: function()
{
return new WebInspector.HeapSnapshotRetainerEdgeIterator(new WebInspector.HeapSnapshotRetainerEdge(this._snapshot, this.nodeIndex, 0));
},
selfSize: function()
{
var snapshot = this._snapshot;
return snapshot._nodes[this.nodeIndex + snapshot._nodeSelfSizeOffset];
},
type: function()
{
return this._snapshot._nodeTypes[this._type()];
},
_name: function()
{
var snapshot = this._snapshot;
return snapshot._nodes[this.nodeIndex + snapshot._nodeNameOffset];
},
_edgeIndexesStart: function()
{
return this._snapshot._firstEdgeIndexes[this._ordinal()];
},
_edgeIndexesEnd: function()
{
return this._snapshot._firstEdgeIndexes[this._ordinal() + 1];
},
_ordinal: function()
{
return this.nodeIndex / this._snapshot._nodeFieldCount;
},
_nextNodeIndex: function()
{
return this.nodeIndex + this._snapshot._nodeFieldCount;
},
_type: function()
{
var snapshot = this._snapshot;
return snapshot._nodes[this.nodeIndex + snapshot._nodeTypeOffset];
}
};
/**
* @constructor
*/
WebInspector.HeapSnapshotNodeIterator = function(node)
{
this.node = node;
this._nodesLength = node._snapshot._nodes.length;
}
WebInspector.HeapSnapshotNodeIterator.prototype = {
first: function()
{
this.node.nodeIndex = this.node._firstNodeIndex;
},
hasNext: function()
{
return this.node.nodeIndex < this._nodesLength;
},
index: function()
{
return this.node.nodeIndex;
},
setIndex: function(newIndex)
{
this.node.nodeIndex = newIndex;
},
item: function()
{
return this.node;
},
next: function()
{
this.node.nodeIndex = this.node._nextNodeIndex();
}
}
/**
* @constructor
*/
WebInspector.HeapSnapshot = function(profile)
{
this.uid = profile.snapshot.uid;
this._nodes = profile.nodes;
this._containmentEdges = profile.edges;
/** @type{HeapSnapshotMetainfo} */
this._metaNode = profile.snapshot.meta;
this._strings = profile.strings;
this._snapshotDiffs = {};
this._aggregatesForDiff = null;
this._init();
}
/**
* @constructor
*/
function HeapSnapshotMetainfo()
{
// New format.
this.node_fields = [];
this.node_types = [];
this.edge_fields = [];
this.edge_types = [];
// Old format.
this.fields = [];
this.types = [];
}
/**
* @constructor
*/
function HeapSnapshotHeader()
{
// New format.
this.title = "";
this.uid = 0;
this.meta = new HeapSnapshotMetainfo();
this.node_count = 0;
this.edge_count = 0;
}
WebInspector.HeapSnapshot.prototype = {
_init: function()
{
var meta = this._metaNode;
this._rootNodeIndex = 0;
this._nodeTypeOffset = meta.node_fields.indexOf("type");
this._nodeNameOffset = meta.node_fields.indexOf("name");
this._nodeIdOffset = meta.node_fields.indexOf("id");
this._nodeSelfSizeOffset = meta.node_fields.indexOf("self_size");
this._nodeEdgeCountOffset = meta.node_fields.indexOf("edge_count");
this._nodeFieldCount = meta.node_fields.length;
this._nodeTypes = meta.node_types[this._nodeTypeOffset];
this._nodeHiddenType = this._nodeTypes.indexOf("hidden");
this._nodeObjectType = this._nodeTypes.indexOf("object");
this._nodeNativeType = this._nodeTypes.indexOf("native");
this._nodeCodeType = this._nodeTypes.indexOf("code");
this._nodeSyntheticType = this._nodeTypes.indexOf("synthetic");
this._edgeFieldsCount = meta.edge_fields.length;
this._edgeTypeOffset = meta.edge_fields.indexOf("type");
this._edgeNameOffset = meta.edge_fields.indexOf("name_or_index");
this._edgeToNodeOffset = meta.edge_fields.indexOf("to_node");
this._edgeTypes = meta.edge_types[this._edgeTypeOffset];
this._edgeTypes.push("invisible");
this._edgeElementType = this._edgeTypes.indexOf("element");
this._edgeHiddenType = this._edgeTypes.indexOf("hidden");
this._edgeInternalType = this._edgeTypes.indexOf("internal");
this._edgeShortcutType = this._edgeTypes.indexOf("shortcut");
this._edgeWeakType = this._edgeTypes.indexOf("weak");
this._edgeInvisibleType = this._edgeTypes.indexOf("invisible");
this._nodeFlags = { // bit flags
canBeQueried: 1,
detachedDOMTreeNode: 2,
pageObject: 4, // The idea is to track separately the objects owned by the page and the objects owned by debugger.
visitedMarkerMask: 0x0ffff, // bits: 0,1111,1111,1111,1111
visitedMarker: 0x10000 // bits: 1,0000,0000,0000,0000
};
this.nodeCount = this._nodes.length / this._nodeFieldCount;
this._edgeCount = this._containmentEdges.length / this._edgeFieldsCount;
this._buildEdgeIndexes();
this._markInvisibleEdges();
this._buildRetainers();
this._calculateFlags();
this._calculateObjectToWindowDistance();
var result = this._buildPostOrderIndex();
// Actually it is array that maps node ordinal number to dominator node ordinal number.
this._dominatorsTree = this._buildDominatorTree(result.postOrderIndex2NodeOrdinal, result.nodeOrdinal2PostOrderIndex);
this._calculateRetainedSizes(result.postOrderIndex2NodeOrdinal);
this._buildDominatedNodes();
},
_buildEdgeIndexes: function()
{
// Support for old serialization.
if (this._nodeEdgeCountOffset === -1) {
var nodes = this._nodes;
var nodeCount = this.nodeCount;
var firstEdgeIndexes = this._firstEdgeIndexes = new Uint32Array(nodeCount + 1);
var nodeFieldCount = this._nodeFieldCount;
var nodeEdgesIndexOffset = this._metaNode.node_fields.indexOf("edges_index");
firstEdgeIndexes[nodeCount] = this._containmentEdges.length;
for (var nodeOrdinal = 0; nodeOrdinal < nodeCount; ++nodeOrdinal) {
firstEdgeIndexes[nodeOrdinal] = nodes[nodeOrdinal * nodeFieldCount + nodeEdgesIndexOffset];
}
return;
}
var nodes = this._nodes;
var nodeCount = this.nodeCount;
var firstEdgeIndexes = this._firstEdgeIndexes = new Uint32Array(nodeCount + 1);
var nodeFieldCount = this._nodeFieldCount;
var edgeFieldsCount = this._edgeFieldsCount;
var nodeEdgeCountOffset = this._nodeEdgeCountOffset;
firstEdgeIndexes[nodeCount] = this._containmentEdges.length;
for (var nodeOrdinal = 0, edgeIndex = 0; nodeOrdinal < nodeCount; ++nodeOrdinal) {
firstEdgeIndexes[nodeOrdinal] = edgeIndex;
edgeIndex += nodes[nodeOrdinal * nodeFieldCount + nodeEdgeCountOffset] * edgeFieldsCount;
}
},
_buildRetainers: function()
{
var retainingNodes = this._retainingNodes = new Uint32Array(this._edgeCount);
var retainingEdges = this._retainingEdges = new Uint32Array(this._edgeCount);
// Index of the first retainer in the _retainingNodes and _retainingEdges
// arrays. Addressed by retained node index.
var firstRetainerIndex = this._firstRetainerIndex = new Uint32Array(this.nodeCount + 1);
var containmentEdges = this._containmentEdges;
var edgeFieldsCount = this._edgeFieldsCount;
var nodeFieldCount = this._nodeFieldCount;
var edgeToNodeOffset = this._edgeToNodeOffset;
var nodes = this._nodes;
var firstEdgeIndexes = this._firstEdgeIndexes;
var nodeCount = this.nodeCount;
for (var toNodeFieldIndex = edgeToNodeOffset, l = containmentEdges.length; toNodeFieldIndex < l; toNodeFieldIndex += edgeFieldsCount) {
var toNodeIndex = containmentEdges[toNodeFieldIndex];
if (toNodeIndex % nodeFieldCount)
throw new Error("Invalid toNodeIndex " + toNodeIndex);
++firstRetainerIndex[toNodeIndex / nodeFieldCount];
}
for (var i = 0, firstUnusedRetainerSlot = 0; i < nodeCount; i++) {
var retainersCount = firstRetainerIndex[i];
firstRetainerIndex[i] = firstUnusedRetainerSlot;
retainingNodes[firstUnusedRetainerSlot] = retainersCount;
firstUnusedRetainerSlot += retainersCount;
}
firstRetainerIndex[nodeCount] = retainingNodes.length;
var nextNodeFirstEdgeIndex = firstEdgeIndexes[0];
for (var srcNodeOrdinal = 0; srcNodeOrdinal < nodeCount; ++srcNodeOrdinal) {
var firstEdgeIndex = nextNodeFirstEdgeIndex;
nextNodeFirstEdgeIndex = firstEdgeIndexes[srcNodeOrdinal + 1];
var srcNodeIndex = srcNodeOrdinal * nodeFieldCount;
for (var edgeIndex = firstEdgeIndex; edgeIndex < nextNodeFirstEdgeIndex; edgeIndex += edgeFieldsCount) {
var toNodeIndex = containmentEdges[edgeIndex + edgeToNodeOffset];
if (toNodeIndex % nodeFieldCount)
throw new Error("Invalid toNodeIndex " + toNodeIndex);
var firstRetainerSlotIndex = firstRetainerIndex[toNodeIndex / nodeFieldCount];
var nextUnusedRetainerSlotIndex = firstRetainerSlotIndex + (--retainingNodes[firstRetainerSlotIndex]);
retainingNodes[nextUnusedRetainerSlotIndex] = srcNodeIndex;
retainingEdges[nextUnusedRetainerSlotIndex] = edgeIndex;
}
}
},
dispose: function()
{
delete this._nodes;
delete this._strings;
delete this._retainingEdges;
delete this._retainingNodes;
delete this._firstRetainerIndex;
if (this._aggregates) {
delete this._aggregates;
delete this._aggregatesSortedFlags;
}
delete this._dominatedNodes;
delete this._firstDominatedNodeIndex;
delete this._flags;
delete this._distancesToWindow;
delete this._dominatorsTree;
},
_allNodes: function()
{
return new WebInspector.HeapSnapshotNodeIterator(this.rootNode());
},
rootNode: function()
{
return new WebInspector.HeapSnapshotNode(this, this._rootNodeIndex);
},
get rootNodeIndex()
{
return this._rootNodeIndex;
},
get totalSize()
{
return this.rootNode().retainedSize();
},
_getDominatedIndex: function(nodeIndex)
{
if (nodeIndex % this._nodeFieldCount)
throw new Error("Invalid nodeIndex: " + nodeIndex);
return this._firstDominatedNodeIndex[nodeIndex / this._nodeFieldCount];
},
_dominatedNodesOfNode: function(node)
{
var dominatedIndexFrom = this._getDominatedIndex(node.nodeIndex);
var dominatedIndexTo = this._getDominatedIndex(node._nextNodeIndex());
return new WebInspector.HeapSnapshotArraySlice(this._dominatedNodes, dominatedIndexFrom, dominatedIndexTo);
},
_flagsOfNode: function(node)
{
return this._flags[node.nodeIndex / this._nodeFieldCount];
},
/**
* @param {boolean} sortedIndexes
* @param {string} key
* @param {string=} filterString
*/
aggregates: function(sortedIndexes, key, filterString)
{
if (!this._aggregates) {
this._aggregates = {};
this._aggregatesSortedFlags = {};
}
var aggregatesByClassName = this._aggregates[key];
if (aggregatesByClassName) {
if (sortedIndexes && !this._aggregatesSortedFlags[key]) {
this._sortAggregateIndexes(aggregatesByClassName);
this._aggregatesSortedFlags[key] = sortedIndexes;
}
return aggregatesByClassName;
}
var filter;
if (filterString)
filter = this._parseFilter(filterString);
var aggregates = this._buildAggregates(filter);
this._calculateClassesRetainedSize(aggregates.aggregatesByClassIndex, filter);
aggregatesByClassName = aggregates.aggregatesByClassName;
if (sortedIndexes)
this._sortAggregateIndexes(aggregatesByClassName);
this._aggregatesSortedFlags[key] = sortedIndexes;
this._aggregates[key] = aggregatesByClassName;
return aggregatesByClassName;
},
aggregatesForDiff: function()
{
if (this._aggregatesForDiff)
return this._aggregatesForDiff;
var aggregatesByClassName = this.aggregates(true, "allObjects");
this._aggregatesForDiff = {};
var node = new WebInspector.HeapSnapshotNode(this);
for (var className in aggregatesByClassName) {
var aggregate = aggregatesByClassName[className];
var indexes = aggregate.idxs;
var ids = new Array(indexes.length);
var selfSizes = new Array(indexes.length);
for (var i = 0; i < indexes.length; i++) {
node.nodeIndex = indexes[i];
ids[i] = node.id();
selfSizes[i] = node.selfSize();
}
this._aggregatesForDiff[className] = {
indexes: indexes,
ids: ids,
selfSizes: selfSizes
};
}
return this._aggregatesForDiff;
},
_calculateObjectToWindowDistance: function()
{
var nodeFieldCount = this._nodeFieldCount;
var distances = new Uint32Array(this.nodeCount);
// bfs for Window roots
var nodesToVisit = new Uint32Array(this.nodeCount);
var nodesToVisitLength = 0;
for (var iter = this.rootNode().edges(); iter.hasNext(); iter.next()) {
var node = iter.edge.node();
if (node.isWindow()) {
nodesToVisit[nodesToVisitLength++] = node.nodeIndex;
distances[node.nodeIndex / nodeFieldCount] = 1;
}
}
this._bfs(nodesToVisit, nodesToVisitLength, distances);
// bfs for root
nodesToVisitLength = 0;
nodesToVisit[nodesToVisitLength++] = this._rootNodeIndex;
distances[this._rootNodeIndex / nodeFieldCount] = 1;
this._bfs(nodesToVisit, nodesToVisitLength, distances);
this._distancesToWindow = distances;
},
_bfs: function(nodesToVisit, nodesToVisitLength, distances)
{
// Peload fields into local variables for better performance.
var edgeFieldsCount = this._edgeFieldsCount;
var nodeFieldCount = this._nodeFieldCount;
var containmentEdges = this._containmentEdges;
var firstEdgeIndexes = this._firstEdgeIndexes;
var edgeToNodeOffset = this._edgeToNodeOffset;
var edgeTypeOffset = this._edgeTypeOffset;
var nodes = this._nodes;
var nodeCount = this.nodeCount;
var containmentEdgesLength = containmentEdges.length;
var edgeWeakType = this._edgeWeakType;
var edgeShortcutType = this._edgeShortcutType;
var index = 0;
while (index < nodesToVisitLength) {
var nodeIndex = nodesToVisit[index++]; // shift generates too much garbage.
var nodeOrdinal = nodeIndex / nodeFieldCount;
var distance = distances[nodeOrdinal] + 1;
var firstEdgeIndex = firstEdgeIndexes[nodeOrdinal];
var edgesEnd = firstEdgeIndexes[nodeOrdinal + 1];
for (var edgeIndex = firstEdgeIndex; edgeIndex < edgesEnd; edgeIndex += edgeFieldsCount) {
var edgeType = containmentEdges[edgeIndex + edgeTypeOffset];
if (edgeType == edgeWeakType)
continue;
var childNodeIndex = containmentEdges[edgeIndex + edgeToNodeOffset];
var childNodeOrdinal = childNodeIndex / nodeFieldCount;
if (distances[childNodeOrdinal])
continue;
distances[childNodeOrdinal] = distance;
nodesToVisit[nodesToVisitLength++] = childNodeIndex;
}
}
if (nodesToVisitLength > nodeCount)
throw new Error("BFS failed. Nodes to visit (" + nodesToVisitLength + ") is more than nodes count (" + nodeCount + ")");
},
_buildAggregates: function(filter)
{
var aggregates = {};
var aggregatesByClassName = {};
var classIndexes = [];
var nodes = this._nodes;
var flags = this._flags;
var nodesLength = nodes.length;
var nodeNativeType = this._nodeNativeType;
var nodeFieldCount = this._nodeFieldCount;
var selfSizeOffset = this._nodeSelfSizeOffset;
var nodeTypeOffset = this._nodeTypeOffset;
var pageObjectFlag = this._nodeFlags.pageObject;
var node = new WebInspector.HeapSnapshotNode(this, this._rootNodeIndex);
var distancesToWindow = this._distancesToWindow;
for (var nodeIndex = this._rootNodeIndex; nodeIndex < nodesLength; nodeIndex += nodeFieldCount) {
var nodeOrdinal = nodeIndex / nodeFieldCount;
if (!(flags[nodeOrdinal] & pageObjectFlag))
continue;
node.nodeIndex = nodeIndex;
if (filter && !filter(node))
continue;
var selfSize = nodes[nodeIndex + selfSizeOffset];
if (!selfSize && nodes[nodeIndex + nodeTypeOffset] !== nodeNativeType)
continue;
var classIndex = node.classIndex();
if (!(classIndex in aggregates)) {