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Bug 1226176 - Compute retained sizes in dominator trees and expose them to JavaScript; r=bz,sfink
This commit is contained in:
parent
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@ -4,14 +4,45 @@
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/devtools/DominatorTree.h"
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#include "mozilla/devtools/DominatorTree.h"
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#include "js/Debug.h"
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#include "mozilla/CycleCollectedJSRuntime.h"
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#include "mozilla/dom/DominatorTreeBinding.h"
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#include "mozilla/dom/DominatorTreeBinding.h"
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namespace mozilla {
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namespace mozilla {
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namespace devtools {
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namespace devtools {
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dom::Nullable<uint64_t>
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DominatorTree::GetRetainedSize(uint64_t aNodeId, ErrorResult& aRv)
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{
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JS::ubi::Node::Id id(aNodeId);
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auto node = mHeapSnapshot->getNodeById(id);
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if (node.isNothing())
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return dom::Nullable<uint64_t>();
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auto ccrt = CycleCollectedJSRuntime::Get();
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MOZ_ASSERT(ccrt);
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auto rt = ccrt->Runtime();
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MOZ_ASSERT(rt);
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auto mallocSizeOf = JS::dbg::GetDebuggerMallocSizeOf(rt);
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MOZ_ASSERT(mallocSizeOf);
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JS::ubi::Node::Size size = 0;
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if (!mDominatorTree.getRetainedSize(*node, mallocSizeOf, size)) {
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aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
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return dom::Nullable<uint64_t>();
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}
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MOZ_ASSERT(size != 0,
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"The node should not have been unknown since we got it from the heap snapshot.");
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return dom::Nullable<uint64_t>(size);
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}
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/*** Cycle Collection Boilerplate *****************************************************************/
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/*** Cycle Collection Boilerplate *****************************************************************/
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NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(DominatorTree, mParent)
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NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(DominatorTree, mParent, mHeapSnapshot)
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NS_IMPL_CYCLE_COLLECTING_ADDREF(DominatorTree)
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NS_IMPL_CYCLE_COLLECTING_ADDREF(DominatorTree)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(DominatorTree)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(DominatorTree)
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@ -6,6 +6,7 @@
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#ifndef mozilla_devtools_DominatorTree__
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#ifndef mozilla_devtools_DominatorTree__
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#define mozilla_devtools_DominatorTree__
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#define mozilla_devtools_DominatorTree__
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#include "mozilla/devtools/HeapSnapshot.h"
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#include "mozilla/dom/BindingDeclarations.h"
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#include "mozilla/dom/BindingDeclarations.h"
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#include "mozilla/ErrorResult.h"
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#include "mozilla/ErrorResult.h"
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#include "mozilla/RefCounted.h"
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#include "mozilla/RefCounted.h"
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@ -25,13 +26,17 @@ protected:
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private:
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private:
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JS::ubi::DominatorTree mDominatorTree;
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JS::ubi::DominatorTree mDominatorTree;
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RefPtr<HeapSnapshot> mHeapSnapshot;
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public:
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public:
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explicit DominatorTree(JS::ubi::DominatorTree&& aDominatorTree, nsISupports* aParent)
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explicit DominatorTree(JS::ubi::DominatorTree&& aDominatorTree, HeapSnapshot* aHeapSnapshot,
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nsISupports* aParent)
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: mParent(aParent)
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: mParent(aParent)
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, mDominatorTree(Move(aDominatorTree))
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, mDominatorTree(Move(aDominatorTree))
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, mHeapSnapshot(aHeapSnapshot)
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{
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{
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MOZ_ASSERT(aParent);
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MOZ_ASSERT(aParent);
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MOZ_ASSERT(aHeapSnapshot);
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};
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};
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS;
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS;
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@ -42,7 +47,11 @@ public:
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virtual JSObject* WrapObject(JSContext* aCx,
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virtual JSObject* WrapObject(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) override;
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JS::Handle<JSObject*> aGivenProto) override;
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// readonly attribute NodeId root
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uint64_t Root() const { return mDominatorTree.root().identifier(); }
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uint64_t Root() const { return mDominatorTree.root().identifier(); }
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// [Throws] NodeSize getRetainedSize(NodeId node)
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dom::Nullable<uint64_t> GetRetainedSize(uint64_t aNodeId, ErrorResult& aRv);
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};
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};
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} // namespace devtools
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} // namespace devtools
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@ -11,12 +11,14 @@
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#include "js/Debug.h"
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#include "js/Debug.h"
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#include "js/TypeDecls.h"
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#include "js/TypeDecls.h"
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#include "js/UbiNodeCensus.h"
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#include "js/UbiNodeBreadthFirst.h"
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#include "js/UbiNodeBreadthFirst.h"
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#include "js/UbiNodeCensus.h"
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#include "js/UbiNodeDominatorTree.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/devtools/AutoMemMap.h"
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#include "mozilla/devtools/AutoMemMap.h"
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#include "mozilla/devtools/CoreDump.pb.h"
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#include "mozilla/devtools/CoreDump.pb.h"
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#include "mozilla/devtools/DeserializedNode.h"
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#include "mozilla/devtools/DeserializedNode.h"
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#include "mozilla/devtools/DominatorTree.h"
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#include "mozilla/devtools/FileDescriptorOutputStream.h"
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#include "mozilla/devtools/FileDescriptorOutputStream.h"
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#include "mozilla/devtools/HeapSnapshotTempFileHelperChild.h"
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#include "mozilla/devtools/HeapSnapshotTempFileHelperChild.h"
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#include "mozilla/devtools/ZeroCopyNSIOutputStream.h"
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#include "mozilla/devtools/ZeroCopyNSIOutputStream.h"
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@ -538,7 +540,7 @@ HeapSnapshot::ComputeDominatorTree(ErrorResult& rv)
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return nullptr;
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return nullptr;
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}
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}
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return MakeAndAddRef<DominatorTree>(Move(*maybeTree), mParent);
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return MakeAndAddRef<DominatorTree>(Move(*maybeTree), this, mParent);
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}
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}
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@ -9,7 +9,6 @@
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#include "js/HashTable.h"
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#include "js/HashTable.h"
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#include "mozilla/ErrorResult.h"
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#include "mozilla/ErrorResult.h"
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#include "mozilla/devtools/DeserializedNode.h"
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#include "mozilla/devtools/DeserializedNode.h"
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#include "mozilla/devtools/DominatorTree.h"
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#include "mozilla/dom/BindingDeclarations.h"
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#include "mozilla/dom/BindingDeclarations.h"
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#include "mozilla/dom/Nullable.h"
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#include "mozilla/dom/Nullable.h"
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#include "mozilla/HashFunctions.h"
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#include "mozilla/HashFunctions.h"
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@ -30,6 +29,8 @@
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namespace mozilla {
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namespace mozilla {
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namespace devtools {
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namespace devtools {
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class DominatorTree;
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struct NSFreePolicy {
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struct NSFreePolicy {
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void operator()(void* ptr) {
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void operator()(void* ptr) {
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NS_Free(ptr);
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NS_Free(ptr);
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@ -148,6 +149,13 @@ public:
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return JS::ubi::Node(const_cast<DeserializedNode*>(&node));
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return JS::ubi::Node(const_cast<DeserializedNode*>(&node));
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}
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}
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Maybe<JS::ubi::Node> getNodeById(JS::ubi::Node::Id nodeId) {
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auto p = nodes.lookup(nodeId);
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if (!p)
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return Nothing();
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return Some(JS::ubi::Node(const_cast<DeserializedNode*>(&*p)));
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}
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void TakeCensus(JSContext* cx, JS::HandleObject options,
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void TakeCensus(JSContext* cx, JS::HandleObject options,
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JS::MutableHandleValue rval, ErrorResult& rv);
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JS::MutableHandleValue rval, ErrorResult& rv);
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@ -0,0 +1,22 @@
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/* Any copyright is dedicated to the Public Domain.
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http://creativecommons.org/publicdomain/zero/1.0/ */
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// Test that we can get the retained sizes of dominator trees.
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function run_test() {
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const dominatorTree = saveHeapSnapshotAndComputeDominatorTree();
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equal(typeof dominatorTree.getRetainedSize, "function",
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"getRetainedSize should be a function");
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const size = dominatorTree.getRetainedSize(dominatorTree.root);
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ok(size, "should get a size for the root");
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equal(typeof size, "number", "retained sizes should be a number");
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equal(Math.floor(size), size, "size should be an integer");
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ok(size > 0, "size should be positive");
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ok(size <= Math.pow(2, 64), "size should be less than or equal to 2^64");
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const bad = dominatorTree.getRetainedSize(1);
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equal(bad, null, "null is returned for unknown node ids");
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do_test_finished();
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}
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@ -31,6 +31,7 @@ support-files =
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[test_DominatorTree_01.js]
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[test_DominatorTree_01.js]
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[test_DominatorTree_02.js]
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[test_DominatorTree_02.js]
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[test_DominatorTree_03.js]
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[test_DominatorTree_03.js]
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[test_DominatorTree_04.js]
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[test_HeapAnalyses_getCreationTime_01.js]
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[test_HeapAnalyses_getCreationTime_01.js]
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[test_HeapAnalyses_readHeapSnapshot_01.js]
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[test_HeapAnalyses_readHeapSnapshot_01.js]
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[test_HeapAnalyses_takeCensusDiff_01.js]
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[test_HeapAnalyses_takeCensusDiff_01.js]
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*/
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*/
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typedef unsigned long long NodeId;
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typedef unsigned long long NodeId;
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typedef unsigned long long NodeSize;
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/**
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/**
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* In a directed graph with a root node `R`, a node `A` is said to "dominate" a
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* In a directed graph with a root node `R`, a node `A` is said to "dominate" a
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@ -45,4 +46,11 @@ interface DominatorTree {
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* tree was created from.
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* tree was created from.
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*/
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*/
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readonly attribute NodeId root;
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readonly attribute NodeId root;
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/**
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* Get the retained size of the node with the given id. If given an invalid
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* id, null is returned. Throws an error on OOM.
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*/
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[Throws]
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NodeSize? getRetainedSize(NodeId node);
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};
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};
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@ -789,7 +789,11 @@ class Node {
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using Size = Base::Size;
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using Size = Base::Size;
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Size size(mozilla::MallocSizeOf mallocSizeof) const {
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Size size(mozilla::MallocSizeOf mallocSizeof) const {
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return base()->size(mallocSizeof);
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auto size = base()->size(mallocSizeof);
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MOZ_ASSERT(size > 0,
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"C++ does not have zero-sized types! Choose 1 if you just need a "
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"conservative default.");
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return size;
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}
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}
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UniquePtr<EdgeRange> edges(JSRuntime* rt, bool wantNames = true) const {
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UniquePtr<EdgeRange> edges(JSRuntime* rt, bool wantNames = true) const {
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@ -290,6 +290,7 @@ class JS_PUBLIC_API(DominatorTree)
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NodeToIndexMap nodeToPostOrderIndex;
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NodeToIndexMap nodeToPostOrderIndex;
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mozilla::Vector<uint32_t> doms;
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mozilla::Vector<uint32_t> doms;
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DominatedSets dominatedSets;
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DominatedSets dominatedSets;
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mozilla::Maybe<mozilla::Vector<JS::ubi::Node::Size>> retainedSizes;
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private:
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private:
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// We use `UNDEFINED` as a sentinel value in the `doms` vector to signal
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// We use `UNDEFINED` as a sentinel value in the `doms` vector to signal
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@ -303,6 +304,7 @@ class JS_PUBLIC_API(DominatorTree)
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, nodeToPostOrderIndex(mozilla::Move(nodeToPostOrderIndex))
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, nodeToPostOrderIndex(mozilla::Move(nodeToPostOrderIndex))
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, doms(mozilla::Move(doms))
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, doms(mozilla::Move(doms))
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, dominatedSets(mozilla::Move(dominatedSets))
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, dominatedSets(mozilla::Move(dominatedSets))
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, retainedSizes(mozilla::Nothing())
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{ }
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{ }
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static uint32_t intersect(mozilla::Vector<uint32_t>& doms, uint32_t finger1, uint32_t finger2) {
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static uint32_t intersect(mozilla::Vector<uint32_t>& doms, uint32_t finger1, uint32_t finger2) {
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@ -415,6 +417,47 @@ class JS_PUBLIC_API(DominatorTree)
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void assertSanity() const {
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void assertSanity() const {
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MOZ_ASSERT(postOrder.length() == doms.length());
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MOZ_ASSERT(postOrder.length() == doms.length());
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MOZ_ASSERT(postOrder.length() == nodeToPostOrderIndex.count());
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MOZ_ASSERT(postOrder.length() == nodeToPostOrderIndex.count());
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MOZ_ASSERT_IF(retainedSizes.isSome(), postOrder.length() == retainedSizes->length());
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}
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bool computeRetainedSizes(mozilla::MallocSizeOf mallocSizeOf) {
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MOZ_ASSERT(retainedSizes.isNothing());
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auto length = postOrder.length();
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retainedSizes.emplace();
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if (!retainedSizes->growBy(length)) {
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retainedSizes = mozilla::Nothing();
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return false;
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}
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// Iterate in forward order so that we know all of a node's children in
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// the dominator tree have already had their retained size
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// computed. Then we can simply say that the retained size of a node is
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// its shallow size (JS::ubi::Node::size) plus the retained sizes of its
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// immediate children in the tree.
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for (uint32_t i = 0; i < length; i++) {
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auto size = postOrder[i].size(mallocSizeOf);
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for (const auto& dominated : dominatedSets.dominatedSet(postOrder, i)) {
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// The root node dominates itself, but shouldn't contribute to
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// its own retained size.
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if (dominated == postOrder[length - 1]) {
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MOZ_ASSERT(i == length - 1);
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continue;
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}
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auto ptr = nodeToPostOrderIndex.lookup(dominated);
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MOZ_ASSERT(ptr);
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auto idxOfDominated = ptr->value();
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MOZ_ASSERT(idxOfDominated < i);
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size += retainedSizes.ref()[idxOfDominated];
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}
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retainedSizes.ref()[i] = size;
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}
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return true;
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}
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}
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public:
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public:
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@ -428,6 +471,7 @@ class JS_PUBLIC_API(DominatorTree)
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, nodeToPostOrderIndex(mozilla::Move(rhs.nodeToPostOrderIndex))
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, nodeToPostOrderIndex(mozilla::Move(rhs.nodeToPostOrderIndex))
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, doms(mozilla::Move(rhs.doms))
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, doms(mozilla::Move(rhs.doms))
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, dominatedSets(mozilla::Move(rhs.dominatedSets))
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, dominatedSets(mozilla::Move(rhs.dominatedSets))
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, retainedSizes(mozilla::Move(rhs.retainedSizes))
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{
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{
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MOZ_ASSERT(this != &rhs, "self-move is not allowed");
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MOZ_ASSERT(this != &rhs, "self-move is not allowed");
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}
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}
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@ -594,7 +638,30 @@ class JS_PUBLIC_API(DominatorTree)
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auto idx = ptr->value();
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auto idx = ptr->value();
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MOZ_ASSERT(idx < postOrder.length());
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MOZ_ASSERT(idx < postOrder.length());
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return mozilla::Some(dominatedSets.dominatedSet(postOrder, idx));
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return mozilla::Some(dominatedSets.dominatedSet(postOrder, idx));
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};
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}
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/**
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* Get the retained size of the given `node`. The size is placed in
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* `outSize`, or 0 if `node` is not a member of the dominator tree. Returns
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* false on OOM failure, leaving `outSize` unchanged.
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*/
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bool getRetainedSize(const Node& node, mozilla::MallocSizeOf mallocSizeOf,
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Node::Size& outSize) {
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assertSanity();
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auto ptr = nodeToPostOrderIndex.lookup(node);
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if (!ptr) {
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outSize = 0;
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return true;
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}
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if (retainedSizes.isNothing() && !computeRetainedSizes(mallocSizeOf))
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return false;
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auto idx = ptr->value();
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MOZ_ASSERT(idx < postOrder.length());
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outSize = retainedSizes.ref()[idx];
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return true;
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}
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};
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};
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} // namespace ubi
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} // namespace ubi
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@ -36,12 +36,16 @@ template<>
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struct Concrete<FakeNode> : public Base
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struct Concrete<FakeNode> : public Base
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{
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{
|
||||||
static const char16_t concreteTypeName[];
|
static const char16_t concreteTypeName[];
|
||||||
const char16_t* typeName() const { return concreteTypeName; }
|
const char16_t* typeName() const override { return concreteTypeName; }
|
||||||
|
|
||||||
UniquePtr<EdgeRange> edges(JSRuntime* rt, bool wantNames) const {
|
UniquePtr<EdgeRange> edges(JSRuntime* rt, bool wantNames) const override {
|
||||||
return UniquePtr<EdgeRange>(js_new<PreComputedEdgeRange>(get().edges));
|
return UniquePtr<EdgeRange>(js_new<PreComputedEdgeRange>(get().edges));
|
||||||
}
|
}
|
||||||
|
|
||||||
|
Node::Size size(mozilla::MallocSizeOf) const override {
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
static void construct(void* storage, FakeNode* ptr) { new (storage) Concrete(ptr); }
|
static void construct(void* storage, FakeNode* ptr) { new (storage) Concrete(ptr); }
|
||||||
|
|
||||||
protected:
|
protected:
|
||||||
@ -582,6 +586,31 @@ BEGIN_TEST(test_JS_ubi_DominatorTree)
|
|||||||
fprintf(stderr, "Done checking %c's dominated set.\n\n", node.name);
|
fprintf(stderr, "Done checking %c's dominated set.\n\n", node.name);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
struct {
|
||||||
|
FakeNode& node;
|
||||||
|
JS::ubi::Node::Size retainedSize;
|
||||||
|
} sizes[] = {
|
||||||
|
{r, 13},
|
||||||
|
{a, 1},
|
||||||
|
{b, 1},
|
||||||
|
{c, 4},
|
||||||
|
{d, 2},
|
||||||
|
{e, 1},
|
||||||
|
{f, 1},
|
||||||
|
{g, 2},
|
||||||
|
{h, 1},
|
||||||
|
{i, 1},
|
||||||
|
{j, 1},
|
||||||
|
{k, 1},
|
||||||
|
{l, 1},
|
||||||
|
};
|
||||||
|
|
||||||
|
for (auto& expected : sizes) {
|
||||||
|
JS::ubi::Node::Size actual = 0;
|
||||||
|
CHECK(tree.getRetainedSize(&expected.node, nullptr, actual));
|
||||||
|
CHECK(actual == expected.retainedSize);
|
||||||
|
}
|
||||||
|
|
||||||
return true;
|
return true;
|
||||||
}
|
}
|
||||||
END_TEST(test_JS_ubi_DominatorTree)
|
END_TEST(test_JS_ubi_DominatorTree)
|
||||||
|
Loading…
Reference in New Issue
Block a user