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Diffstat (limited to 'devtools/shared/heapsnapshot/DeserializedNode.h')
| -rw-r--r-- | devtools/shared/heapsnapshot/DeserializedNode.h | 317 |
1 files changed, 0 insertions, 317 deletions
diff --git a/devtools/shared/heapsnapshot/DeserializedNode.h b/devtools/shared/heapsnapshot/DeserializedNode.h deleted file mode 100644 index 60d1fb408a..0000000000 --- a/devtools/shared/heapsnapshot/DeserializedNode.h +++ /dev/null @@ -1,317 +0,0 @@ -/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */ -/* This Source Code Form is subject to the terms of the Mozilla Public - * License, v. 2.0. If a copy of the MPL was not distributed with this - * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ - -#ifndef mozilla_devtools_DeserializedNode__ -#define mozilla_devtools_DeserializedNode__ - -#include "js/UbiNode.h" -#include "js/UniquePtr.h" -#include "mozilla/devtools/CoreDump.pb.h" -#include "mozilla/Maybe.h" -#include "mozilla/Move.h" -#include "mozilla/Vector.h" - -// `Deserialized{Node,Edge}` translate protobuf messages from our core dump -// format into structures we can rely upon for implementing `JS::ubi::Node` -// specializations on top of. All of the properties of the protobuf messages are -// optional for future compatibility, and this is the layer where we validate -// that the properties that do actually exist in any given message fulfill our -// semantic requirements. -// -// Both `DeserializedNode` and `DeserializedEdge` are always owned by a -// `HeapSnapshot` instance, and their lifetimes must not extend after that of -// their owning `HeapSnapshot`. - -namespace mozilla { -namespace devtools { - -class HeapSnapshot; - -using NodeId = uint64_t; -using StackFrameId = uint64_t; - -// A `DeserializedEdge` represents an edge in the heap graph pointing to the -// node with id equal to `DeserializedEdge::referent` that we deserialized from -// a core dump. -struct DeserializedEdge { - NodeId referent; - // A borrowed reference to a string owned by this node's owning HeapSnapshot. - const char16_t* name; - - explicit DeserializedEdge(NodeId referent, const char16_t* edgeName = nullptr) - : referent(referent) - , name(edgeName) - { } - DeserializedEdge(DeserializedEdge&& rhs); - DeserializedEdge& operator=(DeserializedEdge&& rhs); - -private: - DeserializedEdge(const DeserializedEdge&) = delete; - DeserializedEdge& operator=(const DeserializedEdge&) = delete; -}; - -// A `DeserializedNode` is a node in the heap graph that we deserialized from a -// core dump. -struct DeserializedNode { - using EdgeVector = Vector<DeserializedEdge>; - using UniqueStringPtr = UniquePtr<char16_t[]>; - - NodeId id; - JS::ubi::CoarseType coarseType; - // A borrowed reference to a string owned by this node's owning HeapSnapshot. - const char16_t* typeName; - uint64_t size; - EdgeVector edges; - Maybe<StackFrameId> allocationStack; - // A borrowed reference to a string owned by this node's owning HeapSnapshot. - const char* jsObjectClassName; - // A borrowed reference to a string owned by this node's owning HeapSnapshot. - const char* scriptFilename; - // A weak pointer to this node's owning `HeapSnapshot`. Safe without - // AddRef'ing because this node's lifetime is equal to that of its owner. - HeapSnapshot* owner; - - DeserializedNode(NodeId id, - JS::ubi::CoarseType coarseType, - const char16_t* typeName, - uint64_t size, - EdgeVector&& edges, - Maybe<StackFrameId> allocationStack, - const char* className, - const char* filename, - HeapSnapshot& owner) - : id(id) - , coarseType(coarseType) - , typeName(typeName) - , size(size) - , edges(Move(edges)) - , allocationStack(allocationStack) - , jsObjectClassName(className) - , scriptFilename(filename) - , owner(&owner) - { } - virtual ~DeserializedNode() { } - - DeserializedNode(DeserializedNode&& rhs) - : id(rhs.id) - , coarseType(rhs.coarseType) - , typeName(rhs.typeName) - , size(rhs.size) - , edges(Move(rhs.edges)) - , allocationStack(rhs.allocationStack) - , jsObjectClassName(rhs.jsObjectClassName) - , scriptFilename(rhs.scriptFilename) - , owner(rhs.owner) - { } - - DeserializedNode& operator=(DeserializedNode&& rhs) - { - MOZ_ASSERT(&rhs != this); - this->~DeserializedNode(); - new(this) DeserializedNode(Move(rhs)); - return *this; - } - - // Get a borrowed reference to the given edge's referent. This method is - // virtual to provide a hook for gmock and gtest. - virtual JS::ubi::Node getEdgeReferent(const DeserializedEdge& edge); - - struct HashPolicy; - -protected: - // This is only for use with `MockDeserializedNode` in testing. - DeserializedNode(NodeId id, const char16_t* typeName, uint64_t size) - : id(id) - , coarseType(JS::ubi::CoarseType::Other) - , typeName(typeName) - , size(size) - , edges() - , allocationStack(Nothing()) - , jsObjectClassName(nullptr) - , scriptFilename(nullptr) - , owner(nullptr) - { } - -private: - DeserializedNode(const DeserializedNode&) = delete; - DeserializedNode& operator=(const DeserializedNode&) = delete; -}; - -static inline js::HashNumber -hashIdDerivedFromPtr(uint64_t id) -{ - // NodeIds and StackFrameIds are always 64 bits, but they are derived from - // the original referents' addresses, which could have been either 32 or 64 - // bits long. As such, NodeId and StackFrameId have little entropy in their - // bottom three bits, and may or may not have entropy in their upper 32 - // bits. This hash should manage both cases well. - id >>= 3; - return js::HashNumber((id >> 32) ^ id); -} - -struct DeserializedNode::HashPolicy -{ - using Lookup = NodeId; - - static js::HashNumber hash(const Lookup& lookup) { - return hashIdDerivedFromPtr(lookup); - } - - static bool match(const DeserializedNode& existing, const Lookup& lookup) { - return existing.id == lookup; - } -}; - -// A `DeserializedStackFrame` is a stack frame referred to by a thing in the -// heap graph that we deserialized from a core dump. -struct DeserializedStackFrame { - StackFrameId id; - Maybe<StackFrameId> parent; - uint32_t line; - uint32_t column; - // Borrowed references to strings owned by this DeserializedStackFrame's - // owning HeapSnapshot. - const char16_t* source; - const char16_t* functionDisplayName; - bool isSystem; - bool isSelfHosted; - // A weak pointer to this frame's owning `HeapSnapshot`. Safe without - // AddRef'ing because this frame's lifetime is equal to that of its owner. - HeapSnapshot* owner; - - explicit DeserializedStackFrame(StackFrameId id, - const Maybe<StackFrameId>& parent, - uint32_t line, - uint32_t column, - const char16_t* source, - const char16_t* functionDisplayName, - bool isSystem, - bool isSelfHosted, - HeapSnapshot& owner) - : id(id) - , parent(parent) - , line(line) - , column(column) - , source(source) - , functionDisplayName(functionDisplayName) - , isSystem(isSystem) - , isSelfHosted(isSelfHosted) - , owner(&owner) - { - MOZ_ASSERT(source); - } - - JS::ubi::StackFrame getParentStackFrame() const; - - struct HashPolicy; - -protected: - // This is exposed only for MockDeserializedStackFrame in the gtests. - explicit DeserializedStackFrame() - : id(0) - , parent(Nothing()) - , line(0) - , column(0) - , source(nullptr) - , functionDisplayName(nullptr) - , isSystem(false) - , isSelfHosted(false) - , owner(nullptr) - { }; -}; - -struct DeserializedStackFrame::HashPolicy { - using Lookup = StackFrameId; - - static js::HashNumber hash(const Lookup& lookup) { - return hashIdDerivedFromPtr(lookup); - } - - static bool match(const DeserializedStackFrame& existing, const Lookup& lookup) { - return existing.id == lookup; - } -}; - -} // namespace devtools -} // namespace mozilla - -namespace JS { -namespace ubi { - -using mozilla::devtools::DeserializedNode; -using mozilla::devtools::DeserializedStackFrame; - -template<> -class Concrete<DeserializedNode> : public Base -{ -protected: - explicit Concrete(DeserializedNode* ptr) : Base(ptr) { } - DeserializedNode& get() const { - return *static_cast<DeserializedNode*>(ptr); - } - -public: - static void construct(void* storage, DeserializedNode* ptr) { - new (storage) Concrete(ptr); - } - - CoarseType coarseType() const final { return get().coarseType; } - Id identifier() const override { return get().id; } - bool isLive() const override { return false; } - const char16_t* typeName() const override; - Node::Size size(mozilla::MallocSizeOf mallocSizeof) const override; - const char* jsObjectClassName() const override { return get().jsObjectClassName; } - const char* scriptFilename() const final { return get().scriptFilename; } - - bool hasAllocationStack() const override { return get().allocationStack.isSome(); } - StackFrame allocationStack() const override; - - // We ignore the `bool wantNames` parameter because we can't control whether - // the core dump was serialized with edge names or not. - js::UniquePtr<EdgeRange> edges(JSContext* cx, bool) const override; - - static const char16_t concreteTypeName[]; -}; - -template<> -class ConcreteStackFrame<DeserializedStackFrame> : public BaseStackFrame -{ -protected: - explicit ConcreteStackFrame(DeserializedStackFrame* ptr) - : BaseStackFrame(ptr) - { } - - DeserializedStackFrame& get() const { - return *static_cast<DeserializedStackFrame*>(ptr); - } - -public: - static void construct(void* storage, DeserializedStackFrame* ptr) { - new (storage) ConcreteStackFrame(ptr); - } - - uint64_t identifier() const override { return get().id; } - uint32_t line() const override { return get().line; } - uint32_t column() const override { return get().column; } - bool isSystem() const override { return get().isSystem; } - bool isSelfHosted(JSContext* cx) const override { return get().isSelfHosted; } - void trace(JSTracer* trc) override { } - AtomOrTwoByteChars source() const override { - return AtomOrTwoByteChars(get().source); - } - AtomOrTwoByteChars functionDisplayName() const override { - return AtomOrTwoByteChars(get().functionDisplayName); - } - - StackFrame parent() const override; - bool constructSavedFrameStack(JSContext* cx, - MutableHandleObject outSavedFrameStack) - const override; -}; - -} // namespace ubi -} // namespace JS - -#endif // mozilla_devtools_DeserializedNode__ |