Attachment 362211 Details for Bug 172848 – [PATCH] Proposed Fix

[patch] [PATCH] Proposed Fix

heap-instances-1.patch (text/plain), 46.37 KB, created by Joseph Pecoraro on 2019-02-15 22:14:42 PST

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Creator: Joseph Pecoraro

Created: 2019-02-15 22:14:42 PST

Size: 46.37 KB

patch

obsolete

>diff --git a/JSTests/ChangeLog b/JSTests/ChangeLog
>index 1c9bc23e4b4..daab3879b23 100644
>--- a/JSTests/ChangeLog
>+++ b/JSTests/ChangeLog
>@@ -1,3 +1,28 @@
>+2019-02-15  Joseph Pecoraro  <pecoraro@apple.com>
>+
>+        Web Inspector: Improve ES6 Class instances in Heap Snapshot instances view
>+        https://bugs.webkit.org/show_bug.cgi?id=172848
>+        <rdar://problem/25709212>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * typeProfiler/inheritance.js:
>+        Rewrite the test slightly for clarity. The hoisting was confusing.
>+
>+        * heapProfiler/class-names.js: Added.
>+        (MyES5Class):
>+        (MyES6Class):
>+        (MyES6Subclass):
>+        Test object types and improved class names.
>+
>+        * heapProfiler/driver/driver.js:
>+        (CheapHeapSnapshotNode):
>+        (CheapHeapSnapshot):
>+        (createCheapHeapSnapshot):
>+        (HeapSnapshot):
>+        (createHeapSnapshot):
>+        Update snapshot parsing from version 1 to version 2.
>+
> 2019-02-15  Michael Saboff  <msaboff@apple.com>
> 
>         RELEASE_ASSERT at com.apple.JavaScriptCore: JSC::jsSubstringOfResolved
>diff --git a/JSTests/heapProfiler/basic-nodes.js b/JSTests/heapProfiler/basic-nodes.js
>index c6339366687..6acd29f1c5e 100644
>--- a/JSTests/heapProfiler/basic-nodes.js
>+++ b/JSTests/heapProfiler/basic-nodes.js
>@@ -1,3 +1,5 @@
>+var SimpleObject = $vm.SimpleObject;
>+
> load("./driver/driver.js");
> 
> function hasDifferentSizeNodes(nodes) {
>diff --git a/JSTests/heapProfiler/class-names.js b/JSTests/heapProfiler/class-names.js
>new file mode 100644
>index 00000000000..4818da5846c
>--- /dev/null
>+++ b/JSTests/heapProfiler/class-names.js
>@@ -0,0 +1,44 @@
>+load("./driver/driver.js");
>+
>+function MyES5ClassUgly() {};
>+MyES5ClassUgly.displayName = "MyES5ClassDisplayName";
>+MyES5ClassUgly.prototype = { constructor: MyES5ClassUgly };
>+
>+class MyES6Class {};
>+class MyES6Subclass extends MyES6Class {};
>+
>+let classInstances = [];
>+for (let i = 0; i < 5; ++i)
>+    classInstances.push(new MyES5ClassUgly);
>+for (let i = 0; i < 10; ++i)
>+    classInstances.push(new MyES6Class);
>+for (let i = 0; i < 20; ++i)
>+    classInstances.push(new MyES6Subclass);
>+
>+let myFunction = function() {};
>+let myMap = new Map;
>+
>+(function() {
>+    let nodes;
>+    let snapshot = createCheapHeapSnapshot();
>+
>+    nodes = snapshot.nodesWithClassName("MyES5ClassDisplayName");
>+    assert(nodes.length === 5, "Snapshot should contain 5 'MyES5ClassDisplayName' (MyES5ClassUgly) instances");
>+    assert(nodes[0].isObjectType, "MyES5Class instance should have had its ObjectType flag set");
>+
>+    nodes = snapshot.nodesWithClassName("MyES6Class");
>+    assert(nodes.length === 10, "Snapshot should contain 10 'MyES6Class' instances");
>+    assert(nodes[0].isObjectType, "MyES6Class instance should have had its ObjectType flag set");
>+
>+    nodes = snapshot.nodesWithClassName("MyES6Subclass");
>+    assert(nodes.length === 20, "Snapshot should contain 20 'MyES6Subclass' instances");
>+    assert(nodes[0].isObjectType, "MyES6Subclass instance should have had its ObjectType flag set");
>+
>+    nodes = snapshot.nodesWithClassName("Function");
>+    assert(nodes.length > 0, "Should be at least 1 Function instance");
>+    assert(!nodes[0].isObjectType, "Function instance should not have its ObjectType flag set");
>+
>+    nodes = snapshot.nodesWithClassName("Map");
>+    assert(nodes.length > 0, "Should be at least 1 Map instance");
>+    assert(!nodes[0].isObjectType, "Map instance should not have its ObjectType flag set");
>+})();
>diff --git a/JSTests/heapProfiler/driver/driver.js b/JSTests/heapProfiler/driver/driver.js
>index 58ee5a80f4f..31666cf4055 100644
>--- a/JSTests/heapProfiler/driver/driver.js
>+++ b/JSTests/heapProfiler/driver/driver.js
>@@ -9,15 +9,19 @@ function assert(condition, reason) {
> // Contains two large lists of all node data and all edge data.
> // Lazily creates node and edge objects off of indexes into these lists.
> 
>-// [<0:id>, <1:size>, <2:classNameTableIndex>, <3:internal>, <4:firstEdgeIndex>];
>+// [<0:id>, <1:size>, <2:classNameTableIndex>, <3:flags>, <4:firstEdgeIndex>];
> const nodeFieldCount = 5;
> const nodeIdOffset = 0;
> const nodeSizeOffset = 1;
> const nodeClassNameOffset = 2;
>-const nodeInternalOffset = 3;
>+const nodeFlagsOffset = 3;
> const nodeFirstEdgeOffset = 4;
> const nodeNoEdgeValue = 0xffffffff; // UINT_MAX
> 
>+// Node Flags.
>+const internalFlagMask = (1 << 0);
>+const objectTypeMask = (1 << 1);
>+
> // [<0:fromId>, <1:toId>, <2:typeTableIndex>, <3:edgeDataIndexOrEdgeNameIndex>]
> const edgeFieldCount = 4;
> const edgeFromIdOffset = 0;
>@@ -35,7 +39,10 @@ CheapHeapSnapshotNode = class CheapHeapSnapshotNode
>         this.id = nodes[nodeIndex + nodeIdOffset];
>         this.size = nodes[nodeIndex + nodeSizeOffset];
>         this.className = snapshot.classNameFromTableIndex(nodes[nodeIndex + nodeClassNameOffset]);
>-        this.internal = nodes[nodeIndex + nodeInternalOffset] ? true : false;
>+
>+        let flags = nodes[nodeIndex + nodeFlagsOffset];
>+        this.internal = flags & internalFlagMask ? true : false;
>+        this.isObjectType = flags & objectTypeMask ? true : false;
> 
>         this.outgoingEdges = [];
>         let firstEdgeIndex = nodes[nodeIndex + nodeFirstEdgeOffset];
>@@ -91,7 +98,7 @@ CheapHeapSnapshot = class CheapHeapSnapshot
>             this._nodes[n++] = nodes[i++]; // id
>             this._nodes[n++] = nodes[i++]; // size
>             this._nodes[n++] = nodes[i++]; // classNameTableIndex
>-            this._nodes[n++] = nodes[i++]; // internal
>+            this._nodes[n++] = nodes[i++]; // flags
>             this._nodes[n++] = nodeNoEdgeValue;
>         }
> 
>@@ -154,7 +161,7 @@ function createCheapHeapSnapshot() {
>     let json = generateHeapSnapshot();
> 
>     let {version, nodes, nodeClassNames, edges, edgeTypes} = json;
>-    assert(version === 1, "Heap Snapshot payload should be version 1");
>+    assert(version === 2, "Heap Snapshot payload should be version 2");
>     assert(nodes.length, "Heap Snapshot should have nodes");
>     assert(nodeClassNames.length, "Heap Snapshot should have nodeClassNames");
>     assert(edges.length, "Heap Snapshot should have edges");
>@@ -210,7 +217,8 @@ HeapSnapshot = class HeapSnapshot
>             let id = nodes[i++];
>             let size = nodes[i++];
>             let classNameIndex = nodes[i++];
>-            let internal = nodes[i++];
>+            let flags = nodes[i++];
>+            let internal = flags & internalFlagMask ? true : false;
> 
>             let node = new HeapSnapshotNode(id, nodeClassNames[classNameIndex], size, internal);
>             this.nodeMap.set(id, node);
>@@ -256,7 +264,7 @@ function createHeapSnapshot() {
>     let json = generateHeapSnapshot();
> 
>     let {version, nodes, nodeClassNames, edges, edgeTypes} = json;
>-    assert(version === 1, "Heap Snapshot payload should be version 1");
>+    assert(version === 2, "Heap Snapshot payload should be version 2");
>     assert(nodes.length, "Heap Snapshot should have nodes");
>     assert(nodeClassNames.length, "Heap Snapshot should have nodeClassNames");
>     assert(edges.length, "Heap Snapshot should have edges");
>diff --git a/JSTests/heapProfiler/variable-edge-types.js b/JSTests/heapProfiler/variable-edge-types.js
>index 92a675ec79f..730f17cb261 100644
>--- a/JSTests/heapProfiler/variable-edge-types.js
>+++ b/JSTests/heapProfiler/variable-edge-types.js
>@@ -1,3 +1,5 @@
>+var SimpleObject = $vm.SimpleObject;
>+
> load("./driver/driver.js");
> 
> let globalScopeVariable = "globalScopeVariableValue";
>diff --git a/JSTests/typeProfiler/inheritance.js b/JSTests/typeProfiler/inheritance.js
>index 9bc64510f4e..03855b51286 100644
>--- a/JSTests/typeProfiler/inheritance.js
>+++ b/JSTests/typeProfiler/inheritance.js
>@@ -5,6 +5,10 @@ load("./driver/driver.js");
> function wrapper()
> {
> 
>+function A() { };
>+function B() { };
>+function C() { };
>+
> var theA = new A;
> var theB = new B;
> var theC = new C;
>@@ -16,9 +20,8 @@ secondHierarchyTest = Object.create(theC);
> 
> var secondB = Object.create(theB);
> 
>-function A() { };
>-function B() { }; B.prototype.__proto__ = A.prototype;
>-function C() { }; C.prototype.__proto__ = A.prototype;
>+B.prototype.__proto__ = A.prototype;
>+C.prototype.__proto__ = A.prototype;
> 
> }
> wrapper();
>diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
>index fa8607f7f23..0bd1f0c7add 100644
>--- a/LayoutTests/ChangeLog
>+++ b/LayoutTests/ChangeLog
>@@ -1,3 +1,15 @@
>+2019-02-15  Joseph Pecoraro  <pecoraro@apple.com>
>+
>+        Web Inspector: Improve ES6 Class instances in Heap Snapshot instances view
>+        https://bugs.webkit.org/show_bug.cgi?id=172848
>+        <rdar://problem/25709212>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * inspector/unit-tests/heap-snapshot-expected.txt:
>+        * inspector/unit-tests/heap-snapshot.html:
>+        Update for the new node flag.
>+
> 2019-02-15  Joseph Pecoraro  <pecoraro@apple.com>
> 
>         Web Inspector: Better categorize CPU usage per-thread / worker
>diff --git a/LayoutTests/inspector/console/queryObjects-expected.txt b/LayoutTests/inspector/console/queryObjects-expected.txt
>index c093f186865..d43fec57ad8 100644
>--- a/LayoutTests/inspector/console/queryObjects-expected.txt
>+++ b/LayoutTests/inspector/console/queryObjects-expected.txt
>@@ -11,13 +11,13 @@ PASS: The result should have 0 items.
> PASS: The result should be an object.
> PASS: The result should be an array object.
> PASS: The result should have 5 items.
>-[ClassA, ClassB, ClassB, ClassC, ClassC]
>+[ClassA, ClassA, ClassB, ClassB, ClassC]
> 
> -- Running test case: CommandLineAPI.queryObjects.ClassA.prototype
> PASS: The result should be an object.
> PASS: The result should be an array object.
> PASS: The result should have 5 items.
>-[ClassA, ClassB, ClassB, ClassC, ClassC]
>+[ClassA, ClassA, ClassB, ClassB, ClassC]
> 
> -- Running test case: CommandLineAPI.queryObjects.Instances.ClassB
> PASS: The result should be an object.
>@@ -28,13 +28,13 @@ PASS: The result should have 0 items.
> PASS: The result should be an object.
> PASS: The result should be an array object.
> PASS: The result should have 3 items.
>-[ClassB, ClassC, ClassC]
>+[ClassB, ClassB, ClassC]
> 
> -- Running test case: CommandLineAPI.queryObjects.ClassB.prototype
> PASS: The result should be an object.
> PASS: The result should be an array object.
> PASS: The result should have 3 items.
>-[ClassB, ClassC, ClassC]
>+[ClassB, ClassB, ClassC]
> 
> -- Running test case: CommandLineAPI.queryObjects.Instances.ClassC
> PASS: The result should be an object.
>diff --git a/LayoutTests/inspector/model/remote-object-expected.txt b/LayoutTests/inspector/model/remote-object-expected.txt
>index 651c3413245..668bdc03e8e 100644
>--- a/LayoutTests/inspector/model/remote-object-expected.txt
>+++ b/LayoutTests/inspector/model/remote-object-expected.txt
>@@ -3730,7 +3730,7 @@ EXPRESSION: Alpha = class A { methodA(){} }; Beta = class B extends Alpha { meth
>   "_classPrototype": {
>     "_type": "object",
>     "_objectId": "<filtered>",
>-    "_description": "B"
>+    "_description": "A"
>   },
>   "_functionDescription": "class B extends Alpha { methodB(){} }"
> }
>diff --git a/LayoutTests/inspector/unit-tests/heap-snapshot-expected.txt b/LayoutTests/inspector/unit-tests/heap-snapshot-expected.txt
>index 5ef12a88212..af5f7090614 100644
>--- a/LayoutTests/inspector/unit-tests/heap-snapshot-expected.txt
>+++ b/LayoutTests/inspector/unit-tests/heap-snapshot-expected.txt
>@@ -23,6 +23,7 @@ PASS: Node className should be 'Window'.
> PASS: Node identifier should match.
> PASS: Node size should match.
> PASS: Node internal state should match.
>+PASS: Node isObjectType state should match.
> PASS: Node gcRoot state should match.
> PASS: Node retainedSize should at least be the size.
> 
>diff --git a/LayoutTests/inspector/unit-tests/heap-snapshot.html b/LayoutTests/inspector/unit-tests/heap-snapshot.html
>index 60bf28963d4..197c0b52093 100644
>--- a/LayoutTests/inspector/unit-tests/heap-snapshot.html
>+++ b/LayoutTests/inspector/unit-tests/heap-snapshot.html
>@@ -9,12 +9,13 @@ function test()
> 
>     WI.TestHeapSnapshotNode = class TestHeapSnapshotNode
>     {
>-        constructor(identifier, className, size, internal)
>+        constructor(identifier, className, size, flags)
>         {
>             this.id = identifier;
>             this.className = className;
>             this.size = size; 
>-            this.internal = internal;
>+            this.internal = flags & (1 << 0) ? true : false;
>+            this.isObjectType = flags & (1 << 1) ? true : false;
>             this.gcRoot = false;
>             this.outgoingEdges = [];
>             this.incomingEdges = [];
>@@ -59,9 +60,9 @@ function test()
>                 let id = nodes[i++];
>                 let size = nodes[i++];
>                 let classNameIndex = nodes[i++];
>-                let internal = nodes[i++];
>+                let flags = nodes[i++];
> 
>-                let node = new WI.TestHeapSnapshotNode(id, nodeClassNames[classNameIndex], size, !!internal);
>+                let node = new WI.TestHeapSnapshotNode(id, nodeClassNames[classNameIndex], size, flags);
>                 nodeMap.set(id, node);
>                 processedNodes.push(node);
>             }
>@@ -127,6 +128,7 @@ function test()
>             && node1.size === node2.size
>             && node1.className === node2.className
>             && node1.internal === node2.internal
>+            && node1.isObjectType === node2.isObjectType
>             && node1.gcRoot === node2.gcRoot;
>     }
> 
>@@ -189,6 +191,7 @@ function test()
>                 InspectorTest.expectThat(heapSnapshotNode.id === testSnapshotNodeForWindowObject.id, "Node identifier should match.")
>                 InspectorTest.expectThat(heapSnapshotNode.size === testSnapshotNodeForWindowObject.size, "Node size should match.");
>                 InspectorTest.expectThat(heapSnapshotNode.internal === testSnapshotNodeForWindowObject.internal, "Node internal state should match.");
>+                InspectorTest.expectThat(heapSnapshotNode.isObjectType === testSnapshotNodeForWindowObject.isObjectType, "Node isObjectType state should match.");
>                 InspectorTest.expectThat(heapSnapshotNode.gcRoot === testSnapshotNodeForWindowObject.gcRoot, "Node gcRoot state should match.");
>                 InspectorTest.expectThat(heapSnapshotNode.retainedSize >= heapSnapshotNode.size, "Node retainedSize should at least be the size.");
>                 resolve();
>diff --git a/Source/JavaScriptCore/ChangeLog b/Source/JavaScriptCore/ChangeLog
>index 5ef0361797b..4ceaeba5147 100644
>--- a/Source/JavaScriptCore/ChangeLog
>+++ b/Source/JavaScriptCore/ChangeLog
>@@ -1,3 +1,31 @@
>+2019-02-15  Joseph Pecoraro  <pecoraro@apple.com>
>+
>+        Web Inspector: Improve ES6 Class instances in Heap Snapshot instances view
>+        https://bugs.webkit.org/show_bug.cgi?id=172848
>+        <rdar://problem/25709212>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * heap/HeapSnapshotBuilder.h:
>+        * heap/HeapSnapshotBuilder.cpp:
>+        Update the snapshot version. Change the node's 0 | 1 internal value
>+        to be a 32bit bit flag. This is nice in that it is both compatible
>+        with the previous snapshot version and the same size. We can use more
>+        flags in the future.
>+
>+        (JSC::HeapSnapshotBuilder::json):
>+        In cases where the classInfo gives us "Object" check for a better
>+        class name by checking (o).__proto__.constructor.name. We avoid this
>+        check in cases where (o).hasOwnProperty("constructor") which is the
>+        case for most Foo.prototype objects. Otherwise this would get the
>+        name of the Foo superclass for the Foo.prototype object.
>+
>+        * runtime/JSObject.cpp:
>+        (JSC::JSObject::calculatedClassName):
>+        Handle some possible edge cases that were not handled before. Such
>+        as a JSObject without a GlobalObject, and an object which doesn't
>+        have a default getPrototype. Try to make the code a little clearer.
>+
> 2019-02-15  Joseph Pecoraro  <pecoraro@apple.com>
> 
>         Web Inspector: Better categorize CPU usage per-thread / worker
>diff --git a/Source/JavaScriptCore/heap/HeapSnapshotBuilder.cpp b/Source/JavaScriptCore/heap/HeapSnapshotBuilder.cpp
>index cd91f800f80..3b36a3b121e 100644
>--- a/Source/JavaScriptCore/heap/HeapSnapshotBuilder.cpp
>+++ b/Source/JavaScriptCore/heap/HeapSnapshotBuilder.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2019 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -20,7 +20,7 @@
>  * 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. 
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>  */
> 
> #include "config.h"
>@@ -79,7 +79,7 @@ void HeapSnapshotBuilder::buildSnapshot()
> void HeapSnapshotBuilder::appendNode(JSCell* cell)
> {
>     ASSERT(m_profiler.activeSnapshotBuilder() == this);
>-    
>+
>     ASSERT(Heap::isMarked(cell));
> 
>     NodeIdentifier identifier;
>@@ -177,12 +177,12 @@ bool HeapSnapshotBuilder::previousSnapshotHasNodeForCell(JSCell* cell, NodeIdent
> //  Inspector snapshots:
> //
> //   {
>-//      "version": 1.0,
>+//      "version": 2,
> //      "type": "Inspector",
>-//      // [<address>, <labelIndex>, <wrappedEddress>] only present in GCDebuggingSnapshot-type snapshots
>+//      // [<address>, <labelIndex>, <wrappedAddress>] only present in GCDebuggingSnapshot-type snapshots
> //      "nodes": [
>-//          <nodeId>, <sizeInBytes>, <nodeClassNameIndex>, <internal>
>-//          <nodeId>, <sizeInBytes>, <nodeClassNameIndex>, <internal>
>+//          <nodeId>, <sizeInBytes>, <nodeClassNameIndex>, <flags>
>+//          <nodeId>, <sizeInBytes>, <nodeClassNameIndex>, <flags>
> //          ...
> //      ],
> //      "nodeClassNames": [
>@@ -204,11 +204,11 @@ bool HeapSnapshotBuilder::previousSnapshotHasNodeForCell(JSCell* cell, NodeIdent
> //  GC heap debugger snapshots:
> //
> //   {
>-//      "version": 1.0,
>+//      "version": 2,
> //      "type": "GCDebugging",
> //      "nodes": [
>-//          <nodeId>, <sizeInBytes>, <nodeClassNameIndex>, <internal>, <labelIndex>, <cellEddress>, <wrappedEddress>,
>-//          <nodeId>, <sizeInBytes>, <nodeClassNameIndex>, <internal>, <labelIndex>, <cellEddress>, <wrappedEddress>,
>+//          <nodeId>, <sizeInBytes>, <nodeClassNameIndex>, <flags>, <labelIndex>, <cellEddress>, <wrappedAddress>,
>+//          <nodeId>, <sizeInBytes>, <nodeClassNameIndex>, <flags>, <labelIndex>, <cellEddress>, <wrappedAddress>,
> //          ...
> //      ],
> //      "nodeClassNames": [
>@@ -240,8 +240,10 @@ bool HeapSnapshotBuilder::previousSnapshotHasNodeForCell(JSCell* cell, NodeIdent
> //     <nodeClassNameIndex>
> //       - index into the "nodeClassNames" list.
> //
>-//     <internal>
>-//       - 0 = false, 1 = true.
>+//     <flags>
>+//       - 0b0000 - no flags
>+//       - 0b0001 - internal instance
>+//       - 0b0010 - Object subclassification
> //
> //     <edgeTypeIndex>
> //       - index into the "edgeTypes" list.
>@@ -254,6 +256,11 @@ bool HeapSnapshotBuilder::previousSnapshotHasNodeForCell(JSCell* cell, NodeIdent
> //      <rootReasonIndex>
> //       - index into the "labels" list.
> 
>+typedef enum {
>+    Internal      = 1 << 0,
>+    ObjectSubtype = 1 << 1,
>+} NodeFlags;
>+
> static uint8_t edgeTypeToNumber(EdgeType type)
> {
>     return static_cast<uint8_t>(type);
>@@ -358,8 +365,8 @@ String HeapSnapshotBuilder::json(Function<bool (const HeapSnapshotNode&)> allowN
>     HashMap<JSCell*, NodeIdentifier> allowedNodeIdentifiers;
> 
>     // Build a list of used class names.
>-    HashMap<const char*, unsigned> classNameIndexes;
>-    classNameIndexes.set("<root>", 0);
>+    HashMap<String, unsigned> classNameIndexes;
>+    classNameIndexes.set("<root>"_s, 0);
>     unsigned nextClassNameIndex = 1;
> 
>     // Build a list of labels (this is just a string table).
>@@ -378,19 +385,37 @@ String HeapSnapshotBuilder::json(Function<bool (const HeapSnapshotNode&)> allowN
>         if (!allowNodeCallback(node))
>             return;
> 
>+        unsigned flags = 0;
>+
>         allowedNodeIdentifiers.set(node.cell, node.identifier);
> 
>-        auto result = classNameIndexes.add(node.cell->classInfo(vm)->className, nextClassNameIndex);
>+        String className = node.cell->classInfo(vm)->className;
>+        if (node.cell->isObject() && className == JSObject::info()->className) {
>+            flags |= ObjectSubtype;
>+
>+            // Skip calculating a class name if this object has a `constructor` own property.
>+            // These cases are typically F.prototype objects and we want to treat these as
>+            // "Object" in snapshots and not get the name of the prototype's parent.
>+            JSObject* object = asObject(node.cell);
>+            if (JSGlobalObject* globalObject = object->structure(vm)->globalObject()) {
>+                ExecState* exec = globalObject->globalExec();
>+                PropertySlot slot(object, PropertySlot::InternalMethodType::VMInquiry);
>+                if (!object->getOwnPropertySlot(object, exec, vm.propertyNames->constructor, slot))
>+                    className = JSObject::calculatedClassName(object);
>+            }
>+        }
>+
>+        auto result = classNameIndexes.add(className, nextClassNameIndex);
>         if (result.isNewEntry)
>             nextClassNameIndex++;
>         unsigned classNameIndex = result.iterator->value;
> 
>-        bool isInternal = false;
>         void* wrappedAddress = 0;
>         unsigned labelIndex = 0;
>         if (!node.cell->isString()) {
>             Structure* structure = node.cell->structure(vm);
>-            isInternal = !structure || !structure->globalObject();
>+            if (!structure || !structure->globalObject())
>+                flags |= Internal;
> 
>             if (m_snapshotType == SnapshotType::GCDebuggingSnapshot) {
>                 String nodeLabel;
>@@ -404,7 +429,7 @@ String HeapSnapshotBuilder::json(Function<bool (const HeapSnapshotNode&)> allowN
>                             nodeLabel = function->calculatedDisplayName(vm);
>                     }
>                 }
>-                
>+
>                 String description = descriptionForCell(node.cell);
>                 if (description.length()) {
>                     if (nodeLabel.length())
>@@ -418,12 +443,12 @@ String HeapSnapshotBuilder::json(Function<bool (const HeapSnapshotNode&)> allowN
>                         nextLabelIndex++;
>                     labelIndex = result.iterator->value;
>                 }
>-                
>+
>                 wrappedAddress = m_wrappedObjectPointers.get(node.cell);
>             }
>         }
> 
>-        // <nodeId>, <sizeInBytes>, <nodeClassNameIndex>, <internal>, [<labelIndex>, <cellEddress>, <wrappedEddress>]
>+        // <nodeId>, <sizeInBytes>, <nodeClassNameIndex>, <flags>, [<labelIndex>, <cellEddress>, <wrappedAddress>]
>         json.append(',');
>         json.appendNumber(node.identifier);
>         json.append(',');
>@@ -431,7 +456,7 @@ String HeapSnapshotBuilder::json(Function<bool (const HeapSnapshotNode&)> allowN
>         json.append(',');
>         json.appendNumber(classNameIndex);
>         json.append(',');
>-        json.append(isInternal ? '1' : '0');
>+        json.appendNumber(flags);
>         if (m_snapshotType == SnapshotType::GCDebuggingSnapshot) {
>             json.append(',');
>             json.appendNumber(labelIndex);
>@@ -479,7 +504,7 @@ String HeapSnapshotBuilder::json(Function<bool (const HeapSnapshotNode&)> allowN
>     json.append('{');
> 
>     // version
>-    json.appendLiteral("\"version\":1");
>+    json.appendLiteral("\"version\":2");
> 
>     // type
>     json.append(',');
>@@ -506,7 +531,7 @@ String HeapSnapshotBuilder::json(Function<bool (const HeapSnapshotNode&)> allowN
>     json.append(',');
>     json.appendLiteral("\"nodeClassNames\":");
>     json.append('[');
>-    Vector<const char *> orderedClassNames(classNameIndexes.size());
>+    Vector<String> orderedClassNames(classNameIndexes.size());
>     for (auto& entry : classNameIndexes)
>         orderedClassNames[entry.value] = entry.key;
>     classNameIndexes.clear();
>@@ -603,7 +628,7 @@ String HeapSnapshotBuilder::json(Function<bool (const HeapSnapshotNode&)> allowN
>         json.append(',');
>         json.appendLiteral("\"roots\":");
>         json.append('[');
>-        
>+
>         HeapSnapshot* snapshot = m_profiler.mostRecentSnapshot();
> 
>         bool firstNode = true;
>@@ -619,7 +644,7 @@ String HeapSnapshotBuilder::json(Function<bool (const HeapSnapshotNode&)> allowN
> 
>             firstNode = false;
>             json.appendNumber(snapshotNode.value().identifier);
>-            
>+
>             // Maybe we should just always encode the root names.
>             const char* rootName = rootTypeToString(it.value.markReason);
>             auto result = labelIndexes.add(rootName, nextLabelIndex);
>diff --git a/Source/JavaScriptCore/runtime/JSObject.cpp b/Source/JavaScriptCore/runtime/JSObject.cpp
>index 1b5c9173a0c..44479667b8d 100644
>--- a/Source/JavaScriptCore/runtime/JSObject.cpp
>+++ b/Source/JavaScriptCore/runtime/JSObject.cpp
>@@ -525,20 +525,22 @@ String JSObject::toStringName(const JSObject* object, ExecState* exec)
> String JSObject::calculatedClassName(JSObject* object)
> {
>     String prototypeFunctionName;
>-    auto globalObject = object->globalObject();
>+    auto structure = object->structure();
>+    auto globalObject = structure->globalObject();
>     VM& vm = globalObject->vm();
>     auto scope = DECLARE_CATCH_SCOPE(vm);
> 
>-    ExecState* exec = globalObject->globalExec();
>-    PropertySlot slot(object->getPrototypeDirect(vm), PropertySlot::InternalMethodType::VMInquiry);
>-    PropertyName constructor(vm.propertyNames->constructor);
>-    if (object->getPropertySlot(exec, constructor, slot)) {
>-        EXCEPTION_ASSERT(!scope.exception());
>-        if (slot.isValue()) {
>-            JSValue constructorValue = slot.getValue(exec, constructor);
>-            if (constructorValue.isCell()) {
>-                if (JSCell* constructorCell = constructorValue.asCell()) {
>-                    if (JSObject* ctorObject = constructorCell->getObject()) {
>+    // Get the display name of obj.__proto__.constructor.
>+    MethodTable::GetPrototypeFunctionPtr defaultGetPrototype = JSObject::getPrototype;
>+    if (LIKELY(structure->classInfo()->methodTable.getPrototype == defaultGetPrototype)) {
>+        JSValue protoValue = object->getPrototypeDirect(vm);
>+        if (protoValue.isObject()) {
>+            JSObject* protoObject = asObject(protoValue);
>+            ExecState* exec = globalObject->globalExec();
>+            PropertySlot slot(protoValue, PropertySlot::InternalMethodType::VMInquiry);
>+            if (protoObject->getPropertySlot(exec, vm.propertyNames->constructor, slot)) {
>+                if (slot.isValue()) {
>+                    if (JSObject* ctorObject = jsDynamicCast<JSObject*>(vm, slot.getValue(exec, vm.propertyNames->constructor))) {
>                         if (JSFunction* constructorFunction = jsDynamicCast<JSFunction*>(vm, ctorObject))
>                             prototypeFunctionName = constructorFunction->calculatedDisplayName(vm);
>                         else if (InternalFunction* constructorFunction = jsDynamicCast<InternalFunction*>(vm, ctorObject))
>@@ -548,6 +550,7 @@ String JSObject::calculatedClassName(JSObject* object)
>             }
>         }
>     }
>+
>     EXCEPTION_ASSERT(!scope.exception() || prototypeFunctionName.isNull());
>     if (UNLIKELY(scope.exception()))
>         scope.clearException();
>diff --git a/Source/WebInspectorUI/ChangeLog b/Source/WebInspectorUI/ChangeLog
>index c46786dc14c..76a4830ea54 100644
>--- a/Source/WebInspectorUI/ChangeLog
>+++ b/Source/WebInspectorUI/ChangeLog
>@@ -1,3 +1,41 @@
>+2019-02-15  Joseph Pecoraro  <pecoraro@apple.com>
>+
>+        Web Inspector: Improve ES6 Class instances in Heap Snapshot instances view
>+        https://bugs.webkit.org/show_bug.cgi?id=172848
>+        <rdar://problem/25709212>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * UserInterface/Workers/HeapSnapshot/HeapSnapshot.js:
>+        (HeapSnapshot):
>+        Support the new snapshot version. The only thing that changes are the
>+        node flags, and its actually completely compatible with version 1.
>+
>+        (HeapSnapshot.updateCategoriesAndMetadata):
>+        List the count of object type instances in each class category.
>+
>+        (HeapSnapshot.prototype.serializeNode):
>+        Include whether or not the node is an object type.
>+
>+        * UserInterface/Proxies/HeapSnapshotNodeProxy.js:
>+        (WebInspector.HeapSnapshotNodeProxy):
>+        (WebInspector.HeapSnapshotNodeProxy.deserialize):
>+        Add a new Node isObjectType property based on the new data.
>+
>+        * UserInterface/Views/HeapSnapshotClassDataGridNode.js:
>+        (WebInspector.HeapSnapshotClassDataGridNode.prototype.createCellContent):
>+        * UserInterface/Views/HeapSnapshotClusterContentView.js:
>+        (WebInspector.HeapSnapshotClusterContentView.iconStyleClassNameForClassName):
>+        If a class contains 50% or more object type instances then it as such
>+        instead of defaulting to native.
>+
>+        * UserInterface/Views/HeapSnapshotDataGridTree.js:
>+        (WebInspector.HeapSnapshotInstancesDataGridTree.prototype.populateTopLevel):
>+        * UserInterface/Views/HeapSnapshotInstanceDataGridNode.js:
>+        (WebInspector.HeapSnapshotInstanceDataGridNode.prototype.createCellContent):
>+        We can be more specific than the default if the individual instance is
>+        known to be an object type.
>+
> 2019-02-15  Joseph Pecoraro  <pecoraro@apple.com>
> 
>         Web Inspector: Logging a native function to the console, such as `alert`, produces unhandled rejection
>diff --git a/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotNodeProxy.js b/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotNodeProxy.js
>index 6e50452c950..d44408a96e6 100644
>--- a/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotNodeProxy.js
>+++ b/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotNodeProxy.js
>@@ -25,15 +25,16 @@
> 
> WI.HeapSnapshotNodeProxy = class HeapSnapshotNodeProxy
> {
>-    constructor(snapshotObjectId, identifier, className, size, retainedSize, internal, gcRoot, dead, dominatorNodeIdentifier, hasChildren)
>+    constructor(snapshotObjectId, {id, className, size, retainedSize, internal, isObjectType, gcRoot, dead, dominatorNodeIdentifier, hasChildren})
>     {
>         this._proxyObjectId = snapshotObjectId;
> 
>-        this.id = identifier;
>+        this.id = id;
>         this.className = className;
>         this.size = size;
>         this.retainedSize = retainedSize;
>         this.internal = internal;
>+        this.isObjectType = isObjectType;
>         this.gcRoot = gcRoot;
>         this.dead = dead;
>         this.dominatorNodeIdentifier = dominatorNodeIdentifier;
>@@ -44,8 +45,7 @@ WI.HeapSnapshotNodeProxy = class HeapSnapshotNodeProxy
> 
>     static deserialize(objectId, serializedNode)
>     {
>-        let {id, className, size, retainedSize, internal, gcRoot, dead, dominatorNodeIdentifier, hasChildren} = serializedNode;
>-        return new WI.HeapSnapshotNodeProxy(objectId, id, className, size, retainedSize, internal, gcRoot, dead, dominatorNodeIdentifier, hasChildren);
>+        return new WI.HeapSnapshotNodeProxy(objectId, serializedNode);
>     }
> 
>     // Proxied
>diff --git a/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotClassDataGridNode.js b/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotClassDataGridNode.js
>index 369fb00edd5..5791ac1722d 100644
>--- a/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotClassDataGridNode.js
>+++ b/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotClassDataGridNode.js
>@@ -60,10 +60,11 @@ WI.HeapSnapshotClassDataGridNode = class HeapSnapshotClassDataGridNode extends W
>             return Number.bytesToString(this._data.size);
> 
>         if (columnIdentifier === "className") {
>-            let {className} = this._data;
>+            const internal = false;
>+            let {className, isObjectSubcategory} = this._data;
>             let fragment = document.createDocumentFragment();
>             let iconElement = fragment.appendChild(document.createElement("img"));
>-            iconElement.classList.add("icon", WI.HeapSnapshotClusterContentView.iconStyleClassNameForClassName(className));
>+            iconElement.classList.add("icon", WI.HeapSnapshotClusterContentView.iconStyleClassNameForClassName(className, internal, isObjectSubcategory));
>             let nameElement = fragment.appendChild(document.createElement("span"));
>             nameElement.classList.add("class-name");
>             nameElement.textContent = className;
>diff --git a/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotClusterContentView.js b/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotClusterContentView.js
>index d2091ad7fe4..1e0d72855d5 100644
>--- a/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotClusterContentView.js
>+++ b/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotClusterContentView.js
>@@ -58,10 +58,12 @@ WI.HeapSnapshotClusterContentView = class HeapSnapshotClusterContentView extends
> 
>     // Static
> 
>-    static iconStyleClassNameForClassName(className, internal)
>+    static iconStyleClassNameForClassName(className, internal, isObjectType)
>     {
>         if (internal)
>             return "native";
>+        if (isObjectType)
>+            return "object";
> 
>         switch (className) {
>         case "Object":
>diff --git a/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotDataGridTree.js b/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotDataGridTree.js
>index d1425141976..dbac6a7d806 100644
>--- a/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotDataGridTree.js
>+++ b/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotDataGridTree.js
>@@ -218,7 +218,9 @@ WI.HeapSnapshotInstancesDataGridTree = class HeapSnapshotInstancesDataGridTree e
>         // Populate the first level with the different classes.
>         let skipInternalOnlyObjects = !WI.settings.debugShowInternalObjectsInHeapSnapshot.value;
> 
>-        for (let [className, {size, retainedSize, count, internalCount, deadCount}] of this.heapSnapshot.categories) {
>+        for (let [className, {size, retainedSize, count, internalCount, deadCount, objectCount}] of this.heapSnapshot.categories) {
>+            console.assert(count > 0);
>+
>             // Possibly skip internal only classes.
>             if (skipInternalOnlyObjects && count === internalCount)
>                 continue;
>@@ -228,7 +230,11 @@ WI.HeapSnapshotInstancesDataGridTree = class HeapSnapshotInstancesDataGridTree e
>             if (!liveCount)
>                 continue;
> 
>-            this.appendChild(new WI.HeapSnapshotClassDataGridNode({className, size, retainedSize, count: liveCount}, this));
>+            // If over half of the objects with this class name are Object sub-types, treat this as an Object category.
>+            // This can happen if the page has a JavaScript Class with the same name as a native class.
>+            let isObjectSubcategory = (objectCount / count) > 0.5;
>+
>+            this.appendChild(new WI.HeapSnapshotClassDataGridNode({className, size, retainedSize, isObjectSubcategory, count: liveCount}, this));
>         }
> 
>         this.didPopulate();
>diff --git a/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotInstanceDataGridNode.js b/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotInstanceDataGridNode.js
>index 566f350c017..3248826793c 100644
>--- a/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotInstanceDataGridNode.js
>+++ b/Source/WebInspectorUI/UserInterface/Views/HeapSnapshotInstanceDataGridNode.js
>@@ -146,12 +146,12 @@ WI.HeapSnapshotInstanceDataGridNode = class HeapSnapshotInstanceDataGridNode ext
>             return Number.bytesToString(this._node.size);
> 
>         if (columnIdentifier === "className") {
>-            let {className, id, internal} = this._node;
>+            let {className, id, internal, isObjectType} = this._node;
>             let containerElement = document.createElement("span");
>             containerElement.addEventListener("contextmenu", this._contextMenuHandler.bind(this));
> 
>             let iconElement = containerElement.appendChild(document.createElement("img"));
>-            iconElement.classList.add("icon", WI.HeapSnapshotClusterContentView.iconStyleClassNameForClassName(className, internal));
>+            iconElement.classList.add("icon", WI.HeapSnapshotClusterContentView.iconStyleClassNameForClassName(className, internal, isObjectType));
> 
>             if (this._edge) {
>                 let nameElement = containerElement.appendChild(document.createElement("span"));
>@@ -410,7 +410,7 @@ WI.HeapSnapshotInstanceDataGridNode = class HeapSnapshotInstanceDataGridNode ext
>             containerElement.classList.add("node");
> 
>             let iconElement = containerElement.appendChild(document.createElement("img"));
>-            iconElement.classList.add("icon", WI.HeapSnapshotClusterContentView.iconStyleClassNameForClassName(node.className, node.internal));
>+            iconElement.classList.add("icon", WI.HeapSnapshotClusterContentView.iconStyleClassNameForClassName(node.className, node.internal, node.isObjectType));
> 
>             let classNameElement = containerElement.appendChild(document.createElement("span"));
>             classNameElement.textContent = sanitizeClassName(node.className) + " ";
>diff --git a/Source/WebInspectorUI/UserInterface/Workers/HeapSnapshot/HeapSnapshot.js b/Source/WebInspectorUI/UserInterface/Workers/HeapSnapshot/HeapSnapshot.js
>index af6fdff9a6e..16b45044d3c 100644
>--- a/Source/WebInspectorUI/UserInterface/Workers/HeapSnapshot/HeapSnapshot.js
>+++ b/Source/WebInspectorUI/UserInterface/Workers/HeapSnapshot/HeapSnapshot.js
>@@ -30,14 +30,18 @@
>  */
> 
> // nodes
>-// [<0:id>, <1:size>, <2:classNameTableIndex>, <3:internal>]
>+// [<0:id>, <1:size>, <2:classNameTableIndex>, <3:flags>]
> const nodeFieldCount = 4;
> const nodeIdOffset = 0;
> const nodeSizeOffset = 1;
> const nodeClassNameOffset = 2;
>-const nodeInternalOffset = 3;
>+const nodeFlagsOffset = 3;
> const gcDebuggingNodeFieldCount = 7;
> 
>+// node flags
>+const internalFlagsMask = (1 << 0);
>+const objectTypeMask = (1 << 1);
>+
> // edges
> // [<0:fromId>, <1:toId>, <2:typeTableIndex>, <3:edgeDataIndexOrEdgeNameIndex>]
> const edgeFieldCount = 4;
>@@ -51,6 +55,10 @@ const rootNodeIndex = 0;
> const rootNodeOrdinal = 0;
> const rootNodeIdentifier = 0;
> 
>+// Version Differences:
>+//   - In Version 1, node[3] now named <flags> was the value 0 or 1 indicating not-internal or internal.
>+//   - In Version 2, this became a bitmask so multiple flags could be included without modifying the size.
>+//
> // Terminology:
> //   - `nodeIndex` is an index into the `nodes` list.
> //   - `nodeOrdinal` is the order of the node in the `nodes` list. (nodeIndex / nodeFieldCount).
>@@ -85,7 +93,7 @@ HeapSnapshot = class HeapSnapshot
>         snapshotDataString = null;
> 
>         let {version, type, nodes, nodeClassNames, edges, edgeTypes, edgeNames} = json;
>-        console.assert(version === 1, "Expect JavaScriptCore Heap Snapshot version 1");
>+        console.assert(version === 1 || version === 2, "Expect JavaScriptCore Heap Snapshot version 1 or 2");
>         console.assert(!type || (type === "Inspector" || type === "GCDebugging"), "Expect an Inspector / GCDebugging Heap Snapshot");
> 
>         this._nodeFieldCount = type === "GCDebugging" ? gcDebuggingNodeFieldCount : nodeFieldCount;
>@@ -165,18 +173,20 @@ HeapSnapshot = class HeapSnapshot
>             let className = nodeClassNamesTable[classNameTableIndex];
>             let size = nodes[nodeIndex + nodeSizeOffset];
>             let retainedSize = nodeOrdinalToRetainedSizes[nodeOrdinal];
>-            let internal = nodes[nodeIndex + nodeInternalOffset] ? true : false;
>+            let flags = nodes[nodeIndex + nodeFlagsOffset];
>             let dead = nodeOrdinalIsDead[nodeOrdinal] ? true : false;
> 
>             let category = categories[className];
>             if (!category)
>-                category = categories[className] = {className, size: 0, retainedSize: 0, count: 0, internalCount: 0, deadCount: 0};
>+                category = categories[className] = {className, size: 0, retainedSize: 0, count: 0, internalCount: 0, deadCount: 0, objectCount: 0};
> 
>             category.size += size;
>             category.retainedSize += retainedSize;
>             category.count += 1;
>-            if (internal)
>+            if (flags & internalFlagsMask)
>                 category.internalCount += 1;
>+            if (flags & objectTypeMask)
>+                category.objectCount += 1;
>             if (dead)
>                 category.deadCount += 1;
>             else
>@@ -422,6 +432,7 @@ HeapSnapshot = class HeapSnapshot
>         let nodeOrdinal = nodeIndex / this._nodeFieldCount;
>         let edgeIndex = this._nodeOrdinalToFirstOutgoingEdge[nodeOrdinal];
>         let hasChildren = this._edges[edgeIndex + edgeFromIdOffset] === nodeIdentifier;
>+        let nodeFlags = this._nodes[nodeIndex + nodeFlagsOffset];
> 
>         let dominatorNodeOrdinal = this._nodeOrdinalToDominatorNodeOrdinal[nodeOrdinal];
>         let dominatorNodeIndex = dominatorNodeOrdinal * this._nodeFieldCount;
>@@ -432,7 +443,8 @@ HeapSnapshot = class HeapSnapshot
>             className: this._nodeClassNamesTable[this._nodes[nodeIndex + nodeClassNameOffset]],
>             size: this._nodes[nodeIndex + nodeSizeOffset],
>             retainedSize: this._nodeOrdinalToRetainedSizes[nodeOrdinal],
>-            internal: this._nodes[nodeIndex + nodeInternalOffset] ? true : false,
>+            internal: nodeFlags & internalFlagsMask ? true : false,
>+            isObjectType: nodeFlags & objectTypeMask ? true : false,
>             gcRoot: this._nodeOrdinalIsGCRoot[nodeOrdinal] ? true : false,
>             dead: this._nodeOrdinalIsDead[nodeOrdinal] ? true : false,
>             dominatorNodeIdentifier,
>@@ -759,7 +771,7 @@ HeapSnapshot = class HeapSnapshot
>             for (let incomingEdgeIndex = incomingEdgeIndexEnd - 1; incomingEdgeIndex >= incomingEdgeIndexStart; --incomingEdgeIndex) {
>                 let fromNodeOrdinal = this._incomingNodes[incomingEdgeIndex];
>                 let fromNodeIndex = fromNodeOrdinal * this._nodeFieldCount;
>-                let fromNodeIsInternal = this._nodes[fromNodeIndex + nodeInternalOffset];
>+                let fromNodeIsInternal = this._nodes[fromNodeIndex + nodeFlagsOffset] & internalFlagsMask;
>                 if (fromNodeIsInternal)
>                     continue;
> 
>diff --git a/Tools/GCHeapInspector/heap-analysis/HeapSnapshot.js b/Tools/GCHeapInspector/heap-analysis/HeapSnapshot.js
>index 727598845a6..db2b2b7aaeb 100644
>--- a/Tools/GCHeapInspector/heap-analysis/HeapSnapshot.js
>+++ b/Tools/GCHeapInspector/heap-analysis/HeapSnapshot.js
>@@ -30,16 +30,20 @@
>  */
> 
> // nodes
>-// [<0:id>, <1:size>, <2:classNameTableIndex>, <3:internal>, <4:labelIndex>, <5:address>, <6:wrapped address>]
>-let nodeFieldCount = 7;
>+// [<0:id>, <1:size>, <2:classNameTableIndex>, <3:flags>, <4:labelIndex>, <5:address>, <6:wrapped address>]
>+const nodeFieldCount = 7;
> const nodeIdOffset = 0;
> const nodeSizeOffset = 1;
> const nodeClassNameOffset = 2;
>-const nodeInternalOffset = 3;
>+const nodeFlagsOffset = 3;
> const nodeLabelOffset = 4;
> const nodeAddressOffset = 5;
> const nodeWrappedAddressOffset = 6;
> 
>+// node flags
>+const internalFlagsMask = (1 << 0);
>+const objectTypeMask = (1 << 1);
>+
> // edges
> // [<0:fromId>, <1:toId>, <2:typeTableIndex>, <3:edgeDataIndexOrEdgeNameIndex>]
> const edgeFieldCount = 4;
>@@ -93,7 +97,7 @@ HeapSnapshot = class HeapSnapshot
>         snapshotDataString = null;
> 
>         let {version, type, nodes, nodeClassNames, edges, edgeTypes, edgeNames, roots, labels} = json;
>-        console.assert(version === 1, "Expect JavaScriptCore Heap Snapshot version 1");
>+        console.assert(version === 1 || version === 2, "Expect JavaScriptCore Heap Snapshot version 1 or 2");
>         console.assert(type === "GCDebugging", "Expect a GCDebugging-type snapshot");
> 
>         this._nodes = nodes;
>@@ -199,18 +203,20 @@ HeapSnapshot = class HeapSnapshot
>             let className = nodeClassNamesTable[classNameTableIndex];
>             let size = nodes[nodeIndex + nodeSizeOffset];
>             let retainedSize = nodeOrdinalToRetainedSizes[nodeOrdinal];
>-            let internal = nodes[nodeIndex + nodeInternalOffset] ? true : false;
>+            let flags = nodes[nodeIndex + nodeFlagsOffset];
>             let dead = nodeOrdinalIsDead[nodeOrdinal] ? true : false;
> 
>             let category = categories[className];
>             if (!category)
>-                category = categories[className] = {className, size: 0, retainedSize: 0, count: 0, internalCount: 0, deadCount: 0};
>+                category = categories[className] = {className, size: 0, retainedSize: 0, count: 0, internalCount: 0, deadCount: 0, objectCount: 0};
> 
>             category.size += size;
>             category.retainedSize += retainedSize;
>             category.count += 1;
>-            if (internal)
>+            if (flags & internalFlagsMask)
>                 category.internalCount += 1;
>+            if (flags & objectTypeMask)
>+                category.objectCount += 1;
>             if (dead)
>                 category.deadCount += 1;
>             else
>@@ -478,6 +484,7 @@ HeapSnapshot = class HeapSnapshot
>         let nodeOrdinal = nodeIndex / nodeFieldCount;
>         let edgeIndex = this._nodeOrdinalToFirstOutgoingEdge[nodeOrdinal];
>         let hasChildren = this._edges[edgeIndex + edgeFromIdOffset] === nodeIdentifier;
>+        let nodeFlags = this._nodes[nodeIndex + nodeFlagsOffset];
> 
>         let dominatorNodeOrdinal = this._nodeOrdinalToDominatorNodeOrdinal[nodeOrdinal];
>         let dominatorNodeIndex = dominatorNodeOrdinal * nodeFieldCount;
>@@ -488,7 +495,8 @@ HeapSnapshot = class HeapSnapshot
>             className: this._nodeClassNamesTable[this._nodes[nodeIndex + nodeClassNameOffset]],
>             size: this._nodes[nodeIndex + nodeSizeOffset],
>             retainedSize: this._nodeOrdinalToRetainedSizes[nodeOrdinal],
>-            internal: this._nodes[nodeIndex + nodeInternalOffset] ? true : false,
>+            internal: nodeFlags & internalFlagsMask ? true : false,
>+            isObjectType: nodeFlags & objectTypeMask ? true : false,
>             gcRoot: this._nodeOrdinalIsGCRoot[nodeOrdinal] ? true : false,
>             markedRoot : this._rootIdentifierToReasons.has(nodeIdentifier),
>             dead: this._nodeOrdinalIsDead[nodeOrdinal] ? true : false,
>@@ -829,9 +837,6 @@ HeapSnapshot = class HeapSnapshot
>             for (let incomingEdgeIndex = incomingEdgeIndexEnd - 1; incomingEdgeIndex >= incomingEdgeIndexStart; --incomingEdgeIndex) {
>                 let fromNodeOrdinal = this._incomingNodes[incomingEdgeIndex];
>                 let fromNodeIndex = fromNodeOrdinal * nodeFieldCount;
>-                // let fromNodeIsInternal = this._nodes[fromNodeIndex + nodeInternalOffset];
>-                // if (fromNodeIsInternal)
>-                //     continue;
> 
>                 let edgeIndex = this._incomingEdges[incomingEdgeIndex];
>                 currentPath.push({edge: edgeIndex});

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Attachments on bug 172848: 311802 | 311803 | 311804 | 311805 | 311883 | 311903 | 311904 | 311905 | 362211 | 362359 | 362394